U.S. patent application number 14/694693 was filed with the patent office on 2015-08-13 for shield member and protective cap.
The applicant listed for this patent is MIDORI ANZEN CO., LTD.. Invention is credited to Fumiharu NAKAYAMA, Wataru OKUMA, Noritaka TAJIMA.
Application Number | 20150223548 14/694693 |
Document ID | / |
Family ID | 42339914 |
Filed Date | 2015-08-13 |
United States Patent
Application |
20150223548 |
Kind Code |
A1 |
OKUMA; Wataru ; et
al. |
August 13, 2015 |
SHIELD MEMBER AND PROTECTIVE CAP
Abstract
In a shield member for covering a face of a wearer and a
protective cap in which the shield member is provided, image
distortion is made as small as possible even when he or she sees an
object through its peripheral portions of the shield member. In a
shield member 5 for covering a face of a wearer installed in a cap
body 3 for protecting a hear of the wearer, it is a shield member 5
formed of a transparent body or a translucent body in a curved
plate-like form and gradually becoming thinner as going from its
central portion to its peripheral portion.
Inventors: |
OKUMA; Wataru; (Tokyo,
JP) ; NAKAYAMA; Fumiharu; (Tokyo, JP) ;
TAJIMA; Noritaka; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MIDORI ANZEN CO., LTD. |
Tokyo |
|
JP |
|
|
Family ID: |
42339914 |
Appl. No.: |
14/694693 |
Filed: |
April 23, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13144892 |
Jul 15, 2011 |
|
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PCT/JP2010/050559 |
Jan 19, 2010 |
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14694693 |
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Current U.S.
Class: |
2/424 |
Current CPC
Class: |
A42B 3/225 20130101 |
International
Class: |
A42B 3/22 20060101
A42B003/22 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 19, 2009 |
JP |
2009-008953 |
Claims
1. A shield member provided in a cap body for protecting a head of
a wearer, for covering a face of the wearer, characterized by:
being formed of a transparent body or a translucent body into a
curved plate-like shape and being gradually thinner as going from a
central portion to a peripheral portion.
2. The shield member as recited in claim 1, characterized in that:
a surface at an inside opposed to the face of the wearer is formed
in a concave shape, a curvature radius in a left-and-right
direction is formed to be smaller than a curvature radius in a
upper-and-lower direction, and a ratio of change in a thickness in
the left-and-right direction is formed to be larger than a ratio of
change in a thickness in the upper-and-lower direction.
3. The shield member as recited in claim characterized by: being
constituted to comprise a main body portion and a visor portion,
and that the main body portion is formed in the curved plate-like
shape, and the visor portion is bent below the main body portion to
project in a direction opposite to the main body portion.
4. The shield member as recited in claim 2, characterized by: being
constituted to comprise a main body portion and a visor portion,
and that the main body portion is formed in the curved plate-like
shape, and the visor portion is bent below the main body portion to
project in a direction opposite to the main body portion.
5. The shield member as recited in claim 3, characterized in that:
a concave portion dented toward an inside of the main body portion
with a predetermined width is formed at a central portion in a
lateral direction of the visor portion.
6. The shield member as recited in claim 4, characterized in that:
a concave portion dented toward an inside of the main body portion
with a predetermined width is formed at a central portion in a
lateral direction of the visor portion.
7. A shield member attached to a cap body for protecting a head of
a wearer, for covering a face of the wearer, characterized by
having: a main body portion for covering a face of the wearer, the
main body being formed of a transparent body or a translucent body
in a curved plate-like shape; and a visor portion for preventing a
flying object from contacting a body of the wearer, the visor
portion being formed integrally with a lowermost end portion of the
main body portion.
8. The shield member as recited in claim 7, characterized in that:
a concave portion dented toward the wearer to open to a lowermost
end side is provided at a central portion in a lateral direction of
the visor portion.
9. A protective cap characterized by having: the shield member as
recited in claim 7; a cap body for protecting a head of the wearer;
and guide means for guiding the shield member to move between a
housing position where the shield member is housed in the cap body
and a shielding position where the shield member covers a face of
the wearer, wherein a gap is formed between a visor portion of the
shield member and a visor portion of the cap body in a state where
the shield member is positioned at the housing position.
10. A protective cap characterized by having: the shield member as
recited in claim 8; a cap body for protecting a head of the wearer;
guide means for guiding the shield member to move between a housing
position where the shield member is housed in the cap body and a
shielding position where the shield member covers a face of the
wearer, wherein a gap is formed between a visor portion of the
shield member and a visor portion of the cap body in a state where
the shield member is positioned at the housing position.
Description
TECHNICAL FIELD
[0001] The present invention relates to a shield member and a
protective cap, and in particular relates to that configured to
cover a face of a wearer.
BACKGROUND ART
[0002] There is so far known a protective cap (helmet) with a
shield (transparent or translucent shield plate) for protecting
eyes of a worker as a measure against accidents in which nails
bounce back out of nailers to stick in worker's eyes or any others
occur during works of construction of a house (see PTL1-PTL3, for
example).
CITATION LIST
Patent Literature
[0003] PTL 1: Japanese Unexamined Patent Publication No.
2003-049316
[0004] PTL 2: Japanese Unexamined Patent Publication No.
2003-253519
[0005] PTL Japanese Unexamined Patent publication No.
2003-082518
SUMMARY OF INVENTION
Problem to be Solved
[0006] However, in regard to a shield plates provided in any of the
aforementioned conventional protective caps, a base material formed
of a transparent material such as a resin in a plate-like shape is
heated, deformed and then formed into a curved shape.
[0007] Thus the thickness of the shield plate is constant
regardless of places, and it gives rise to a problem that, when a
wearer see an object through the shield plate, he or she will not
see a distorted image through its central portion but will see
distorted images through its peripheries.
[0008] More specifically, while an image a wearer see is not
distorted in a case where he or she looks his or her front (right
in front), images will be distorted when he or she moves his or her
eyes left or right, or up or down, to look in a left, right, upper
or lower direction.
[0009] The present invention has been achieved in view of the above
problem, and is intended for providing a shield member and a
protective cap which can make image distortion as small as possible
in a shield member for covering a face of a wearer and a protective
cap in which the shield member is provided even when he or she sees
an object through its peripheral portions.
[0010] A shield member based on a first aspect of the present
invention is a shield member formed of a transparent body or a
translucent body into a curved plate-like shape and being gradually
thinner as going from a central portion to a peripheral portion in
a shield member provided in a cap body for protecting a head of a
wearer, for covering a face of the wearer.
[0011] A shield member based on a second aspect of the present
invention is a shield member in that a surface at an inside opposed
to the face of the wearer is formed in a concave shape, a curvature
radius in a left-and-right direction is formed to be smaller than a
curvature radius in a upper-and-lower direction, and a ratio of
change in a thickness in the left-and-right direction is formed to
be larger than a ratio of change in a thickness in the
upper-and-lower direction in the shield member based on the first
aspect.
[0012] A shield member based on a third aspect of the present
invention is constituted to comprise a main body portion and a
visor portion, and that the main body portion is formed in the
curved plate-like shape, and the visor portion is bent below the
main body portion to project in a direction opposite to the main
body portion in the shield member based on the first aspect or the
second aspect.
[0013] A shield member based on a fourth aspect of the present
invention is a shield member in that a concave portion dented
toward an inside of the main body portion with a predetermined
width is formed at a central portion in a lateral direction of the
visor portion in the shield member based on the fourth aspect.
[0014] A shield member based on a fifth aspect of the present
invention is a shield member having a main body portion for
covering a face of the wearer, the main body being formed of a
transparent body or a translucent body in a curved plate-like shape
and a visor portion for preventing a flying object from contacting
a body of the wearer, the visor portion being formed integrally
with a lowermost end portion of the main body portion in a shield
member provided in a cap body for protecting a head of a wearer,
for covering a face of the wearer.
[0015] A shield member based on a sixth aspect of the present
invention is a shield member in that a concave portion dented
toward the wearer to open to a lowermost end side is provided at a
central portion in a lateral direction of the visor portion in the
shield member based on the fifth aspect.
[0016] A shield member based on a seventh aspect of the present
invention is a shield member having a cap body for protecting a
head of a wearer, guide means for guiding the shield member to move
between a housing position where the shield member is housed in the
cap body and a shielding position where the shield member covers a
face of the wearer, wherein a gap is formed between a visor portion
of the shield member and a visor portion of the cap body in a state
where the shield member is positioned at the housing position in
the shielding member based on the fifth aspect or the sixth
aspect.
[0017] A protective cap based on an eighth aspect of the present
invention is a protective cap having the shield member according to
any of the first aspect through the seventh aspect, a cap body for
protecting a head of the wearer, and guide means for guiding the
shield member to move between a housing position where the shield
member is housed in the cap body and a shielding position where the
shield member covers a face of the wearer, wherein a gap is formed
between a visor portion of the shield member and a visor portion of
the cap body in a state where the shield member is positioned at
the housing position.
Effects of the Invention
[0018] According to the present invention, in a shield member for
covering a face of a wearer and a protective cap in which the
shield member is provided, an effect in which image distortion is
made as small as possible even when he or she sees an object
through its peripheral portions of the shield member is
provided.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a perspective view when a wearer wears a
protective cap 1 in accordance with a first embodiment of the
present invention.
[0020] FIG. 2 is an elevational view when the wearer wears the
protective cap 1.
[0021] FIG. 3 is a side view when the wearer wears the protective
cap 1.
[0022] FIG. 4 is a perspective view when the wearer wears the
protective cap 1.
[0023] FIG. 5 is an elevational view when the wearer wears the
protective cap 1.
[0024] FIG. 6 is a side view when the wearer wears the protective
cap 1.
[0025] FIG. 7 is a cross sectional view of the protective cap
1.
[0026] FIG. 8 is a view of the protective cap 1 viewed from its
inside.
[0027] FIG. 9 is a plan view showing a state where the guide member
11 and the shield plate 5 are assembled.
[0028] FIG. 10 is a plan view showing a state where the guide
member 11 and the shield plate 5 are assembled.
[0029] FIG. 11 is a perspective view showing summarized
configuration of the shield plate 5.
[0030] FIG. 12 is an elevational view showing a summarized
configuration of the shield plate 5.
[0031] FIG. 13 is a side view showing a summarized configuration of
the shield plate 5.
[0032] FIG. 14 is a drawing viewed from an arrow HIV in FIG.
12.
[0033] FIG. 15 is a drawing showing a cross section XV-XV in FIG.
12.
[0034] FIG. 16 is a drawing showing a cross section XVI-XVI in FIG.
12.
[0035] FIG. 17 is an elevational view showing summarized
configuration of the guide member 11.
[0036] FIG. 18 is a drawing viewed from an arrow XVIII in FIG.
17.
[0037] FIG. 19 is a drawing viewed from an arrow XIX in FIG.
17.
[0038] FIG. 20 is a drawing showing a cross section of the shield
plate 5, which is corresponding to FIG. 16.
[0039] FIG. 21 is a perspective view when a wearer wears a
protective cap 201 in accordance with a second embodiment of the
present invention.
[0040] FIG. 22 is a perspective view when the wearer wears the
protective cap 201.
[0041] FIG. 23 is a cross sectional view of the protective cap
201.
[0042] FIG. 24 is a view of the protective cap 201 viewed from its
inside.
[0043] FIG. 25 is a view of the protective cap 201 viewed from its
inside.
[0044] FIG. 26 is a drawing showing a cross section XXVI-XXVI in
FIG. 23.
[0045] FIG. 27 is a drawing showing a concrete configuration of a
protective means 261.
[0046] FIG. 28 is a drawing showing a summarized configuration of a
protective cap 301 in accordance with a third embodiment of the
present invention.
[0047] FIG. 29 is drawing showing differences in outlines of a cap
body 303 of the protective cap 301 and a cap body 300 of a
widely-used protective cap.
[0048] FIG. 30 is a cross sectional view of the protective cap
301.
[0049] FIG. 31 is a drawing showing a state where a wearer wears
the protective cap 301.
[0050] FIG. 32 is a perspective view showing summarized
configuration of an internal member 321.
[0051] FIG. 33 is a drawing showing a cross section XXXIII-XXXIII
in FIG. 28.
[0052] FIG. 34 is a drawing showing a modification of the
protective cap 301.
[0053] FIG. 35 is a drawing showing a summarized configuration of a
protective cap 351 in accordance with a fourth embodiment of the
present invention.
[0054] FIG. 36 is a drawing showing a summarized configuration of
the protective cap.
[0055] FIG. 37 is an enlarged view of a part X in FIG. 36.
[0056] FIG. 38 is an exploded perspective view showing a summarized
configuration of a protective cap in accordance with a fifth
embodiment of the present invention.
[0057] FIG. 39 is a cross sectional view showing a summarized
configuration of the protective cap.
[0058] FIG. 40 is an elevational view of the protective cap, viewed
from an arrow XL in FIG. 39.
[0059] FIG. 41 is a bottom view of the protective cap, viewed from
an arrow XLI in FIG. 39.
[0060] FIG. 42 is a drawing showing a state of engagement between a
cap body and a guide member, and a state of engagement among the
cap body, a chin-strap and a hammock.
[0061] FIG. 43 is a drawing showing an assembly of the guide member
and the shield plate.
[0062] FIG. 44 is a drawing showing the assembly of the guide
member and the shield plate.
[0063] FIG. 45 is a drawing showing details of a guide portion and
such of the guide member.
[0064] FIG. 46 is a drawing showing a summarized configuration of
the cap body.
[0065] FIG. 47 is a drawing showing a side portion to-be-engaged
portion provided in the cap body.
[0066] FIG. 48 is a drawing showing a central portion to-be-engaged
portion provided in the cap body.
[0067] FIG. 49 is a drawing showing a guide member.
[0068] FIG. 50 is a drawing showing the guide member.
[0069] FIG. 51 is a drawing showing a guide member locking
portion.
[0070] FIG. 52 is a drawing showing a shield member.
[0071] FIG. 53 is a drawing showing the shield member.
DESCRIPTION OF EMBODIMENTS
First Embodiment
[0072] FIG. 1 and FIG. 4 are perspective views when a wearer wears
a protective cap 1 in accordance with a first embodiment of the
present invention, FIG. 2 and FIG. 5 are elevational views when the
wearer wears the protective cap 1, and FIG. 3 and FIG. 6 are side
views when the wearer wears the protective cap 1.
[0073] Meanwhile, FIG. 1, FIG. 2 and FIG. 3 show a state where the
shield plate 5 is positioned at a housing position P1, and FIG. 4,
FIG. 5 and FIG. 6 show a state where the shield plate 5 is
positioned at a shielding position P3.
[0074] FIG. 7 is a cross sectional view of the protective cap 1
taken from a plane extending in a front-and-rear and upper-and-rear
directions relative to the protective cap 1 through a center of the
protective cap 1.
[0075] FIG. 9 and FIG. 10 are perspective views showing a state
where the guide member 11 and the shield plate 5 are assembled.
Meanwhile, FIG. 9 shows a state where the shield plate 5 is
positioned at the housing position P1, and FIG. 10 shows a state
where the shield plate 5 is positioned at the shielding position
P3.
[0076] FIG. 11 is a perspective view showing a summarized
configuration of the shield plate 5, FIG. 12 is an elevational view
showing a summarized configuration of the shield plate 5, FIG. 13
is a side view showing a summarized configuration of the shield
plate 5, FIG. 14 is a drawing viewed from an arrow XIV in FIG. 12,
FIG. 15 is a drawing showing a cross section XV-XV in FIG. 12, and
FIG. 16 is a drawing showing a cross section XVI-XVI in FIG.
12.
[0077] FIG. 17 is an elevational view showing a summarized
configuration of the guide member 11, FIG. 18 is a drawing viewed
from an arrow XVIII in FIG. 17, and FIG. 19 is a drawing viewed
from an arrow XIX in FIG. 17.
[0078] Meanwhile, respective directions in a protective cap (a cap
body, a shield plate, a guide member and such) may be a lateral
direction (left-and-right direction), a front-and-rear direction,
and an upper-and-lower direction hereinafter, and descriptions will
be given with reference to terms of "right", "left", "upper",
"lower", "front" and "rear". The aforementioned respective
directions are directions in a case where a standing (uprightly
standing) wearer wears the protective cap, and these three
directions are substantially perpendicular to each other.
[0079] The protective cap (helmet with a shield face) is
constituted to for example comprise a cap body 3 formed to be
substantially bilaterally symmetrical, a shield plate 5, and a
guide means 7 for guiding the shield plate 5.
[0080] The cap body 3 is to protect a head of a wearer, and is for
example constituted of a resin or such to form a bowl form
(semi-spherical-shell-like form).
[0081] Here, the semi-spherical shell is one of bodies two bodies
formed by dividing a body with a shape formed by removing a second
sphere of a slightly smaller radius than a radius of a first sphere
having a predetermined radius, which has a common center with the
first sphere, into two.
[0082] The cap body 3 is formed in a "semi-spherical-shell-like"
form and is thus not formed in a perfect semi-spherical shell form.
More specifically, the cap body 3 is formed in a shape in which the
curvature radius properly changes to fit it with a shape of a head
of a wearer. Further an opening portion (an edge; a lowermost end)
9 of the cap body 3 is not a perfect circular shape and is formed
in a circle-like shape in which the curvature radius properly
changes to fit it with a shape of a head of a wearer.
[0083] As the cap body 3 is formed in a semi-spherical-shell-like
form, when a standing upright wearer wears the protective cap 1,
the opening portion 9 of the cap body 3 becomes substantially
horizontal and the opening portion 9 positions at the slightly
upper side than wearer's ears, thereby exposing the ears of the
wearer (see FIG. 1 FIG. 6). Meanwhile, a visor portion 10 is
provided at the front of the opening portion 9 of the cap body
3.
[0084] The shield plate (face body; a shield member) 5 is to
protect almost all of a face of a wearer and is constituted of a
transparent (including colored transparency) or translucent
material such as a resin.
[0085] The guide means 7 is a means for guiding the shield plate 5
at a time when the shield plate 5 moves relative to the cap body 3,
and it is so structured that the shield member 5 moves to draw a
circle-like trajectory between a housing position P1 and a
shielding position P3. The housing position P1 is a position where
the shield plate 5 is housed in the front interior of the cap body
3, and the shielding position P3 is a position where the shield
plate 5 covers almost all of a face of a wearer (front face of a
head). Meanwhile it is regulated that ears of a wearer hide behind
the shield plate 5 when viewed from the front of the wearer in a
state where the upright standing wearer wears the protective cap 1
and the shield plate 5 is positioned at the shielding position
P3.
[0086] As well as the shield plate 5 guided by the guide means 7 is
made unlikely to be separated from the cap body 3, the shield plate
5 does not move in the left-and-right direction but moves (swings)
with having a predetermined axis C1 (see FIG. 3) extending in the
left-and-right direction of the protective cap 1 (cap body 3) as a
pivotal center. The predetermined axis C1 extends through positions
at the rears of left and right ears of a wearer in the
left-and-right direction (a direction perpendicular to a paper face
of FIG. 3).
[0087] The guide means 7 is constituted to comprise a guide portion
13 provided at the guide member 11 and an engagement portion 15
provided at the shield plate 5 for example.
[0088] The guide portion 13 is formed in an arc-like shape. In a
state where the guide member 11 is installed in the cap body 3, the
guide portion 13 is provided integrally with the cap body 3 in the
interior of the cap body with having a predetermined axis C1 as a
center. Further, the guide portion 13 is provided at both end
portions in the lateral direction and a central portion of the
guide member 11 for example.
[0089] The shield plate 5 is formed in a curved plate-like form.
The shield plate 5 is provided with an engagement portion 15 at
both end portions and a central portion in the lateral direction of
the shield plate 5. Further, as the engagement portion 15 engages
with the guide portion 13, the shield plate 5 moves between the
housing position P1 and the shielding position P3.
[0090] Describing the state where the shield plate 5 positions at
the housing position P1 in more detail, the shield plate 5 is not
thoroughly housed in the interior of the cap body 3 in this state
but a lowermost end portion (the lowermost end portion where a
visor 17 is provided) of the shield plate 5 and its vicinities
protrudes out of the lowermost end portion 9 of the cap body 3 (the
opening portion of the front side of the cap body 3) downward.
Meanwhile the visor (visor portion) 17 turns over at the lowermost
end portion of the shield plate 5. More specifically, the visor 17
bends in its reverse direction (a direction falling apart from a
face of a wearer) and then extends out. Thereby, even if a flying
object hits the shield plate (the shield plate at the shielding
position P3) 5, a situation in which the flying object slides on
the shield plate 5 to contact a body of a wearer can be
avoided.
[0091] Even if the lowermost end portion or its vicinities of the
shield plate 5 projects out of the lowermost end portion 9 of the
cap body 3 downward in a state where the shield plate 5 is
positioned at the housing position P1, it does not interfere with a
wearer and the wearer can wear the protective cap 1 without being
aware of existence of the shield plate 5 in his or her visual
field. Further an uppermost end portion of the shield plate 5 is
positioned at the vicinity of the top portion of the cap body 3. In
the meantime, it is allowed to omit the visor 17 of the shield
plate 5 and apply a configuration in which the shield plate 5 is
thoroughly housed in the interior of the cap body 3 in a state
where the shield plate 5 is positioned at the housing position
P1.
[0092] In a state where the shield plate 5 is positioned at the
shielding position P3, the lowermost end portion of the shield is
positioned below a chin of a wearer and then the shield plate 5
covers almost all of a face of the wearer. More specifically, when
viewed from the front, all of the face of the wearer is covered
with the shield plate 5 (see FIG. 4-FIG. 6). The uppermost end
portion of the shield plate 5 is positioned in the interior of the
cap body 3 in the vicinity of the lowermost end portion of the cap
body 3 (the opening portion 9 of the front side of the cap body
3).
[0093] The guide member 11 is formed of a resin for example and is
integrally constituted to comprise a first side portion 21 and a
second side portion 23. A central portion 19 is formed in a
plate-like form (curved plate-like form) to comprise a sphere-like
curved surface. The first side portion 21 is integrally provided on
the central portion 19 at one end portion side in the lateral
direction of the central portion 19. The second side portion 23 is
integrally provided on the central portion 19 at another end
portion side in the lateral direction of the central portion
19.
[0094] The first side portion 21 is constituted of a proximal end
portion side portion (a portion at the central portion 19 side) and
a tip end portion side portion 27, and the second side portion 23
is likewise constituted of a proximal end portion side portion (a
portion at the central portion 19 side) 29 and a tip end portion
side portion 31. Further, on the respectively portions 25 and 29, a
part of the guide portion 13 is formed.
[0095] Further, a tip end portion side portion 27 of the first side
portion 21 and a tip end portion side portion 31 of the second side
portion 23 engage with the cap body 3 (in face contact with lower
internal surfaces at sides of the cap body 3, for example) to
provide the cap body 11 integrally with the guide member 11.
[0096] The shield plate 5 enters into a space formed among the cap
body 3, the central portion 19 and the proximal portion side
portions 25 and 29 of the respective side portions 21 and 23,
thereby being housed in the cap body 3.
[0097] The tip end portion side portion 27 of the first side
portion 21 is formed in a plate-like form (curved plate-like form)
comprising a curved surface in face contact with the lower internal
surface at one side of the cap body 3, and the tip end portion side
portion 31 of the second side portion 23 is likewise formed in a
plate-like form (curved plate-like form) comprising a curved
surface in face contact with the lower internal surface at another
side of the cap body 3.
[0098] The proximal end portion side portion 25 of the first side
portion 21 is constituted to comprise a standing portion 33 and a
connection portion 35. The standing portion 33 is formed in an
elongated plate-like form so to have its lateral direction in a
direction of standing to stand from the tip end portion side
portion 27 of the first side portion 21 in a direction, for
example, substantially perpendicular thereto. The connection
portion 35 is formed in an elongated plate-like form. One end
portion in the lateral direction thereof is provided integrally
with the central portion 19 and another end portion in the lateral
direction thereof is provided integrally with the standing portion
33, thereby connecting the standing portion 33 with the central
portion 19.
[0099] In a state where the guide member 11 is provided integrally
with the cap body 3, the standing portion 33 stands in an obliquely
forward direction from the internal surface of the cap body 3 (a
direction to the interior of the cap body 3) and the connection
portion 35 (respective surfaces in its thickness direction of the
connection portion 35) extends in substantially front-and-rear and
upper-and-lower directions.
[0100] Likewise the proximal end portion side portion of the second
side portion 23 is constituted of a standing portion 41 and a
connection portion 43.
[0101] The guide portion 13 of the guide member 11 is constituted
of an elongated slot 39 of an arc-like shape formed on the
connection portion 35, an elongated slot 47 of an arc-like shape
formed on the connection portion 43, and a to-be-engaged portion 63
(a groove 65; a central portion of the central portion 19) formed
to extend in the upper-and-lower direction of the guide member 11
at a central portion in the lateral direction of the guide member
11.
[0102] The engagement portion 15 of the shield plate 5 is
constituted of respective engagement pieces 51, 59 provided at both
end portions in the lateral direction of the shield plate 5, and a
projection 37 provided on the shield plate 5.
[0103] The engagement piece 51, as shown in FIG. 8, FIG. 9, FIG. 10
and FIG. 26, projects inward relative to the shield plate 5 at the
upper end portion side of one end side in the lateral direction of
the shield plate 5, and is provided integrally with the shield
plate 5. The engagement piece 51 is formed in an umbrella-like
shape comprising a proximal end portion 53 in a cylindrical shape
and, an umbrella portion 55 formed in a circular disc-like shape
having a larger outer diameter than the proximal end portion 53.
The engagement piece 51 has the proximal end portion 55 with a
diameter slightly smaller than a width of the elongated slot 39
entering into the elongated slot 39 to engage therewith with
forming a sliding contraposition. Meanwhile the outer diameter of
the umbrella portion 55 is made larger than the width of the
elongated slot 39. Likewise at another side in the lateral
direction of the shield plate 5, the engagement piece 59 is
provided and the engagement piece 59 engages with the elongated
slot 47.
[0104] The projection 37, as shown in FIG. 12-FIG. 14, projects
toward the inside (the concave surface side) of the shield plate 5
at the central portion in the lateral direction of the shield plate
5 and at the uppermost end portion side in the upper-and-lower
direction of the shield plate 5, and is then provided integrally
with the shield plate 5.
[0105] At both end portions in the longitudinal direction of the
groove 65, portions 67, 69 penetrating the guide member 11 are
formed. At the central portion in the longitudinal direction of the
groove 65, a guide concave portion 70 of an elongated plate-like
shape dented toward the inside of the guide member 11 is formed.
Further, as the engagement piece 51 engages with the elongated slot
39, the engagement piece 59 engages with the elongated slot 47, and
a tip end portion of the projection 37 engages with the guide
concave portion 70 to form a sliding contraposition, it is made
that the shield plate 5 is guided to move.
[0106] It has a double structure in which the cap body 3 is
disposed outside and the guide member 11 is disposed inside in the
front of the protective cap 1 as shown in FIG. 7 when the guide
member 11 is installed in the interior of the cap body 3. Then the
shield plate 5 enters in between the cap body 3 and the guide
member 11.
[0107] When the guide member 11 is installed in the cap body 3, a
center of the arc-like elongated slot 39(47) substantially
corresponds to a predetermined axis C1 (see FIG. 3, FIG. 6 and FIG.
7). Thus the shield plate 5 is made to swing to have the axis C1 as
its pivotal center.
[0108] Further, a cross section of the central portion 19 of the
guide member 11 (a cross section shown in FIG. 7) is formed in an
arc-like shape having the predetermined axis C1 as its center.
Further, a cross section of the shield plate 5 (a cross section
shown in FIG. 7) is formed in an arc-like shape having a
predetermined axis C3 as its center. The predetermined axis C3 runs
in parallel with the predetermined axis C1 and is positioned
slightly beyond and at the rear of the predetermined axis C1.
[0109] A curvature radius of the central portion 19 of the guide
member 11 is made larger than a curvature radius of the elongated
slot 39(47), and a curvature radius of the central portion 19 of
the guide member 11 and a curvature radius of the shield plate 5
are substantially equal to each other.
[0110] Further, in the cross section shown in FIG. 7, in a case
where the shield plate 5 is positioned at the housing position P1,
an uppermost end portion of the central portion 19 of the guide
member 11 and an uppermost end portion of the shield plate 5 are
positioned at the upper side of the cap body 3 in the
upper-and-lower direction of the cap body 3, and positioned at a
central portion of the cap body 3 in the front-and-rear direction
of the cap body 3. Further, a lowermost end portion of the central
portion 19 of the guide member 11 and a lowermost end portion of
the shield plate 5 are positioned close to a lowermost end portion
at the front of the cap body 3.
[0111] Further, the protective cap 1 is provided with a retaining
means 61 for retaining the shield plate 5. The retaining means 61
is to retain the shield plate 5 not to readily move the shield
plate 5 relative to the cap body 3 when the shield plate 5 is
positioned at the housing position P1 or the shielding position
P3.
[0112] The retaining means 61 is for example constituted of a
projection 37 provided in the shield plate 5 and a to-be-engaged
portion 63 provided in the guide member 11. The to-be-engaged
portion 63 is constituted to comprise a groove 65 formed to extend
in the upper-and-lower direction of the guide member 11 at the
central portion in the lateral direction of the guide member
11.
[0113] A portion 67 at a side of one end portion (uppermost end
portion) in the longitudinal direction of the guide groove 65 is
formed to have a width B1 narrower than its central portion, and a
portion 69 at a side of another end portion (lowermost end portion)
in the longitudinal direction of the guide groove 65 is also
likewise formed to have a narrow width B1. Further, an outer
diameter D1 of the columnar projection 37 provided on the shield
plate 5 is formed to be very slightly larger than the width B1.
[0114] Further, when the shield plate 5 is positioned at the
housing position P1, the projection 37 enters in the portion 67 at
the side of the uppermost end portion so that the shield plate 5
does not readily move. Further, when the shield plate 5 is
positioned at the shielding position P3, the projection 37 enters
in the portion 69 at the side of the lowermost end portion so that
the shield plate 5 does not readily move.
[0115] By the way, the protective cap 1 is provided with a
not-shown interior body (a hammock for example), and the cap body 3
and the guide member 11 are provided with a plurality of locking
portions 71 for locking the hammock. Among the locking portions 71,
the respective locking portions 71A positioned at the rear side are
provided on the internal surface of the cap body 3 in an integral
manner, and the respective locking portions 71B positioned at the
front side are provided on the internal surface of the guide member
11 in an integral manner.
[0116] Here, the shield plate 5 will be described in more
detail.
[0117] The shield plate 5 is, as described above, installed in the
cap body 3 for protecting a head of a wearer to cover almost all,
for example, of a face of the wearer, and is formed of a
transparent body or a translucent body in a curved plate-like
form.
[0118] The shield plate 5 is formed in a curved plate-like shape
with a convex shape at one side in the thickness direction and a
concave shape at another side in the thickness direction. Further,
the thickness is gradually reduced as going from a central portion
to a peripheral portion (see FIG. 15 and FIG. 16). Meanwhile the
shield plate 5 is constituted of a resin such as acryl or
polycarbonate, and is formed by injection molding. Further the
shield plate 5 is formed in accordance with the ANSI regulation
into a thickness about from 1.6 mm to 2.0 mm. It is made
unbreakable even if it is subject to a high-speed impact test.
[0119] As the shield plate 5 is formed in a curved plate-like
shape, the internal surface (one surface in the thickness
direction) of the shield plate 5 opposed to a face of a wearer is
formed into a concave shape and the external surface as another
surface in the thickness direction is formed into a convex shape.
Further, the shield plate 5 is so formed that the curvature radius
in the left-and-right direction is smaller than the curvature
radius in the upper-and-lower direction and also a ratio of change
in thickness in the left-and-right direction is made larger than a
ratio of change in thickness in the upper-and-lower direction (see
FIG. 15 and FIG. 16). Meanwhile a center of the arc in the
upper-and-lower direction of the shield plate corresponds with the
axis C3. On the other hand, a center of an arc in the
left-and-right direction of the shield plate 5 substantially
corresponds with an axis through a center of the opening portion 9
of the cap body 3 for example.
[0120] Further the shield plate 5 is constituted to comprise a main
body portion 73 and a visor portion 17, and the main body portion
73 is formed in a curved plate-like shape as described above. The
convex surface (concave surface) of the main body portion 73 of the
shield plate 5 is formed in a predetermined shape close to a
predetermined three-dimensional curved surface. The aforementioned
three-dimensional curved surface is one of four three-dimensional
curved surfaces obtained from a side surface of a barrel-like solid
which is a columnar shape with a swelling central portion in the
axial direction by cutting it in a first plane including the axis
and a second plane including the axis and intersecting the first
plane in a predetermined angle.
[0121] Meanwhile, as shown in FIG. 12, the uppermost end of the
main body portion 73 of the shield plate 5 and both ends in the
left-and-right direction are formed in linear shapes when viewed
from the front, and the lowermost end of the main body portion 73
of the shield plate 5 is formed in a downward convex arc-like
shape.
[0122] The visor 17 is as described above bent as opposed to the
main body portion 73 below the main body portion 73 and
projects.
[0123] As described in more detail, the visor portion 17 is as
shown in FIG. 12 formed in a crescent shape when viewed from the
front and in a plate-like shape, and a portion formed in a convex
shape in the crescent shape connects with the lowermost end of the
main body portion 73 of the shield plate 5 and then projects
downward from the lowermost end of the main body portion 73 to be
integral with the main body portion 73. Further, as shown in FIG.
13 (FIG. 6), when a upright wearer wears the cap body 3 and covers
his or her face with the shield plate 5, the visor portion 17
projects toward to gradually fall apart (forward) from the face of
the wearer as going from the uppermost end (the end at the side of
the main body 73) to the lowermost end.
[0124] Further, at the central portion in the lateral direction of
the visor portion 17, a concave portion 75 dented into the interior
of the main body portion 73 (to the rear: to a face of a wearer)
with a predetermined width is formed.
[0125] Operation for getting the shield plate 5 in and out when the
protective cap 1 is worn will be described hereinafter.
[0126] First, in a state where the shield plate 5 is positioned at
the shielding position P1, a wearer wears the protective cap 1. In
a case where he or she needs to position the shield plate 5 at the
shielding position P3 and then work, he or she pulls the lowermost
end portion (the visor portion 17 for example) of the shield plate
5 downward so as to move the shield plate 5 downward, the
projection 37 enters into the portion 69 at the lowermost end
portion side of the guide groove 65 and then the shield plate 5 is
positioned at the shielding position P3, thereby the shield plate 5
is made not to easily move from the shielding position P203.
[0127] On the other hand, in a case where he or she seeks to change
the shield plate 5 at the shielding position P3 into the housing
position P1, he or she pushes the shield plate 5 upward so as to
move it upward, the projection 37 enters into the portion 67 at the
uppermost end side of the guide groove 65, then the shield plate 5
is positioned at the housing position P1, thereby the shield plate
5 is made not to easily move from the housing position P1.
[0128] According to the protective cap 1, as the shield plate 5 has
a configuration in that its thickness is gradually reduced as going
from the central portion to the peripheral portions, a difference
between an optical path length (an optical path length in the
shield plate) in a case where a wearer see the front via the shield
plate 5 and an optical path length (an optical path length in the
shield plate) in a case where the wearer see peripheries via the
shield plate 5 can be made smaller. Even if a wearer see a matter
via peripheral portions of the shield plate 5, distortion of images
can be made as small as possible.
[0129] More specifically, as shown in FIG. 20 (the drawing showing
the cross section of the shield plate 5 and corresponding to FIG.
16), as a difference between the optical path length L11 and the
optical path length L21 in the shield plate 5 is made smaller and a
difference between the optical path length L11 and the optical path
length L31 made smaller, distortion of images can be made as small
as possible.
[0130] Here, the reference sign F0 shown in FIG. 20 denotes a
surface (convex surface) at the outside of the shield plate 5 in
accordance with the present embodiment, and the reference sign F1
denotes a surface (concave surface) at the inside of the shield
plate 5 in accordance with the present embodiment. Thereby the
thickness of the shield plate 5 in accordance with the present
embodiment gradually gets thinner as going from the central portion
to the peripheral portion. On the other hand, the reference sign F0
denotes surface at the outside of the conventional shield plate and
the reference sign F2 denotes a surface at the inside of the
conventional shield plate, thereby the thickness of the
conventional shield plate is constant.
[0131] The reference sign R1 denotes an optical path of light
impinging from the front onto an eye EY of a wearer, the reference
signs R2, R2a denote optical paths of light impinging from sides
(peripheral portions of the shield plate) onto the eye EY of the
wearer, and the reference signs R3, R3a denote optical paths of
light impinging from sides further away onto the eye EY of the
wearer.
[0132] The optical path length L11 of the light (the light through
the optical path R1) from the front onto the eye EY of the wearer
in the shield plate 205 and the optical path length (the optical
path length in the conventional shield plate) L12 are equal to each
other.
[0133] On the other hand, because the shield plate has a
considerably large refractive index as compared with that of air,
on the basis of the Snell's law, the optical path length (the
optical path length in the shield plate 5 in accordance with the
present embodiment) L21 is made shorter than the optical path
length (the optical path length in the conventional shield, plate)
L22 in the shield plate by light from the side surfaces to the eye
EY of the wearer (light in the optical path R2, R2a), and the
optical path length L21 is substantially equal to the optical path
length L11. Likewise, the optical path length L31 is made shorter
than the optical path length L32 and the optical path length L31 is
substantially equal to the optical path length L11. Thereby it
allows that distortion of images is made as small as possible.
[0134] Further, in accordance with the protective cap 1, as the
curvature radius of the shield plate 5 in the left-and-right
direction is formed smaller than the curvature radius in the
upper-and-lower direction and the rate of change in thickness in
the left-and-right direction is formed larger than the rate of
change in thickness in the upper-and-lower direction, distortion of
images when a wearer see objects via peripheral portions of the
shield plate 5 can be made as small as possible according to a
shape of a face of the wearer.
[0135] More specifically, as the curvature radius in the
upper-and-lower direction of the shield plate 5 is made larger than
the curvature radius in the left-and-right direction, it fits with
the shape of the face of the wearer to cover the face of the
wearer. Further, as the curvature radius in the upper-and-lower
direction of the shield plate 5 is made larger than the curvature
radius in the left-and-right direction, the rate of change in
thickness in the upper-and-lower direction of the shield plate 5 is
made smaller than the rate of change in thickness in the
left-and-right direction, distortion of images is made as small as
possible.
[0136] Further according to the protective cap 1, as the visor
portion 17 of the shield plate 5 is bent to project in a direction
opposed to the main body 73 (a direction falling apart from a face
of a wearer) below the main body 73, as described above, even if a
flying object hits the shield plate 5, a situation in which the
flying object slides on the shield plate 5 to contact a body of a
wearer can be avoided.
[0137] More specifically, as shown in FIG. 6 by an arrow A13, if a
flying object flying from a direction obliquely forward collides
with the lower part of the shield plate 5 in a shallow angle, it
gives rise to a case where the aforementioned flying object
colliding and bouncing back reaches a breast or a stomach of the
wearer. Meanwhile, as a wearer in FIG. 6 turns in a horizontal
direction, the aforementioned suspicion is not so considerable,
however, when he or she works with keeping his or her face upward,
a suspicion in which a flying object colliding and bouncing back
reaches a breast or a stomach under influence of the gravity.
However, as the visor portion 17 is provided, the flying object
colliding and bouncing back is made to re-collide with the visor
portion 17 and then falls dawn to any sites apart from the wearer.
It can be avoided that it reaches the body of the wearer.
[0138] Further, according to the protective cap 1, as the concave
portion 75 is provided, a wearer of the protective cap 1 can
conveniently operate the shield plate 5.
[0139] More specifically, in a state where the shield plate 5
exists at the housing position P1 for example, as the concave
portion 75 is provided on the visor 17 of the shield plate 5, a gap
into which a wearer can put his or her fingers is held between the
visor portion 17 of the shield plate 5 and the visor portion 10 of
the cap body 3. Further, the shield plate 5 existing at the housing
position P1 is easily moved downward and then can be made
positioned at the shielding position P3.
[0140] Further according to the protective cap 1, as the shield
plate 5 is steadily installed in the cap body 5 and the guide means
7 makes the shield plate 5 swing with having the predetermined axis
C1 as its center, failure to attach the shield plate 5 is prevented
and the movement stroke of the shield plate 5 is elongated with
keeping the conventional shape and without making the cap body 3
bigger. Further, although the length (height) of the shield plate 5
is sufficiently long to cover almost all of a face of a wearer, the
shield plate 5 can be substantially housed in the interior of the
cap body 3 not to interfere with the wearer.
[0141] Further, as the cap body 3 is formed in a
semi-spherical-shell-like shape from which portions to cover ears
of a wearer are removed, the protective cap 1 is small-sized and
then its weight is reduced, and further it gives a feeling of being
liberated to the wearer.
[0142] Further, in accordance with the protective cap 1, as the
shield plate 5 is guided by the arc-like guide portion 13 to move
to draw a trajectory of an arc-like shape, the movement stroke of
the shield plate 5 can be further elongated and, although the
shield plate 5 having a sufficient length to cover almost all of a
face of a wearer is used, it is made further easier to
substantially house the shield plate 5 in the interior of the cap
body 3 not to interfere with the wearer.
[0143] Further in accordance with the protective cap 1, as the
guide portion 13 in the arc-like shape is formed in the arc-like
shape having the predetermined axis C1 as its center and then
provided in the interior of the cap body 3, the cap body 3 in the
semi-spherical-shell-like shape which does not cover ears of a
wearer can be used. More specifically, if it has a configuration in
which the shield plate 5 is made supported by the cap body at the
predetermined axis C1, a swinging axis for supporting the shield
plate 5 (an axis positioned at the axis C1 of the shield plate 5)
needs to be additionally provided, thereby ear portions (portions
to cover ears of a wearer) or such are necessary to be provided in
the cap body 3 and therefore the cap body 3 must not be made in a
semi-spherical-shell-like shape. However, the protective cap 1
allows it not to have the cap body 3 provided with the ear portions
and make a shape of the cap body 3 be in a
semi-spherical-shell-like shape.
[0144] Further, in accordance with the protective cap 1, as the
guide member 11 is integrally constituted and also made contact
with the cap body 3 at two portions in the left-and-right direction
of the cap body 3 to be integrally provided, stiffness of the guide
member 11 of itself and attachment stiffness when the guide member
11 is attached to the cap body 3 are increased.
[0145] Further, the locking portion 71B for locking the hammock
constituting the interior body can be provided in the interior of
the central portion 19 of the guide member 11 so as not to
interfere with the shield plate 5 of the guide portion 13.
[0146] Meanwhile, as the shield plate, that of a half type covering
an upper half of a face of a wearer can be used.
Second Embodiment
[0147] FIG. 21 and FIG. 22 are perspective views when a wearer
wears a protective cap 201 in accordance with the second embodiment
of the present invention, FIG. 23 is a cross sectional view of the
protective cap 201, and FIG. 24 and FIG. 25 are views of the
protective cap 201 viewed from its inside.
[0148] Meanwhile FIG. 21 and FIG. 24 show a state where the shield
plate 205 is positioned at a housing position P201, and FIG. 22 and
FIG. 25 show a state where the shield plate 205 is positioned at a
shielding position P203. Further, FIG. 23 is a cross sectional view
taken from a plane extending in the upper-and-lower direction of
the protective cap 201 through a center of the protective cap
201.
[0149] The protective cap (helmet with a shield face) 201 is
constituted to for example comprise a cap body 203 formed to be
substantially bilaterally symmetrical, a shield plate 205, and a
guide means 207 for guiding the shield plate 205.
[0150] The cap body 203 is to protect a head of a wearer, and is
for example constituted of a resin or such to form a bowl form
(semi-spherical-shell-like form, for example).
[0151] The cap body 203 is, as with the cap body 3, formed in a
"semi-spherical-shell-like" form and is thus not formed in a
perfect semi-spherical shell form. More specifically, the cap body
203 is formed in a shape in which the curvature radius properly
changes to fit it with a shape of a head of a wearer. Further an
opening portion (an edge; a lowermost end) 209 of the cap body 203
is not a perfect circular shape and is formed in a circle-like
shape in which the curvature radius properly changes to fit it with
a shape of a head of a wearer.
[0152] As the cap body 203 is formed in a semi-spherical-shell-like
form, the external surface and the internal surface of the cap body
203 are formed in a smooth spherical-surface-like shape in which
sharply curved portions do not exist. Further, as the cap body 203
is formed in a semi-spherical-shell-like form, the opening portion
209 of the cap body 203 becomes substantially horizontal and the
opening portion 209 positions at the slightly upper side than
wearer's ears when a standing upright wearer wears the protective
cap 201 (see FIG. 21 and FIG. 22).
[0153] The shield plate (face body; a shield member) 205 is formed
in a way, for example, similar to the shield plate 5 in accordance
with the first embodiment, is to protect almost all of a face of a
wearer, and constituted of a transparent (including colored
transparency) or translucent material such as a resin.
[0154] The guide means 207 is a means for guiding the shield plate
205 at a time when the shield plate 205 moves relative to the cap
body 203 in a similar way to the guide means 7, and it is so
structured that the shield plate 205 moves to draw a circle-like
trajectory along a curved surface at the inside of the cap body 203
(internal curved surface at the front side of the cap body 203
formed in a concave sphere-like shape) between the housing position
P201 and the shielding position P203. The housing position P201
positioned at the upper side is a position where the shield plate
205 positioned at the lower side is housed in the front interior of
the cap body 203, and the shielding position P203 is a position
where the shield plate 205 covers almost all of a face of a wearer
(a front surface of a head).
[0155] As well as the shield plate 205 guided by the guide means
207 is made unlikely to be separated from the cap body 203, the
shield plate 205 does not move in the left-and-right direction but
moves (swings) to have a predetermined axis C201 (see FIG. 23)
extending in the left-and-right direction of the protective cap 201
(cap body 203) as a pivotal center. The predetermined axis C201
extends through positions of left and right ears of a wearer in the
left-and-right direction (a direction perpendicular to paper faces
of FIG. 203).
[0156] The guide means 207 is constituted to comprise guide
portions 213 provided at the guide member 211 and engagement
portions 215 provided at the shield plate 205 for example.
[0157] The guide portions 213 are formed in an arc-like form (not a
perfect arc shape but a shape like an arc) and the guide member 211
is provided integrally with the cap body 203 at the front side and
at the inside of the cap body 203 so as to have the guide portions
213 close to (in parallel with, for example) the internal surface
at the front side of the cap body 203. The guide portions 213 are
provided at both end portions in the lateral direction and the
central portion of the guide member 211 for example.
[0158] The shield plate 205 is formed in a plate-like shape (curved
plate-like shape) comprising a sphere-like curved surface along the
internal surface at the front of the cap body 203 (a curved surface
having a slightly smaller curvature radius than that of the surface
at the front side of the cap body 203, for example). At portions at
both ends in the lateral direction of the shield plate 205,
engagement portions 215 engaging with the guide portions 213 are
provided. Further as the engagement portions 215 engage with the
guide portions 213, the shield plate 205 moves between the housing
position P201 and the shielding position P203.
[0159] Describing the state where the shield plate 205 positions at
the housing position P201 in more detail, the shield plate 205 is
not thoroughly housed in the interior of the cap body 203 in this
state but a lowermost end portion (the lowermost end portion where
a visor 217 is provided) of the shield plate 205 and its vicinities
protrudes out of the lowermost end portion 209 of the cap body 203
(the opening portion of the front side of the cap body 203)
downward. Meanwhile the visor (visor portion) 217, as with the case
of the first embodiment, turns over at the lowermost end portion of
the shield plate 205. More specifically, the visor 217 bends in its
reverse direction (a direction falling apart from a face of a
wearer) and then extends out. Thereby, even if a flying object hits
the shield plate (the shield plate at the shielding position P203)
205, a situation in which the flying object slides on the shield
plate 205 to contact a body of a wearer can be avoided. Meanwhile,
a concave portion 75 may be provided at the central portion in the
lateral direction of the shield plate 205 in a way similar to the
first embodiment.
[0160] Even if the lowermost end portion or its vicinities of the
shield plate 205 projects out of the lowermost end portion 209 of
the cap body 203 downward, it does not interfere with a wearer and
the wearer can wear the protective cap 201 without being aware of
existence of the shield plate 205 in his or her visual field.
Further an uppermost end portion of the shield plate 205 is
positioned at the vicinity of the top portion of the cap body 203.
In the meantime, it is allowed to omit the visor 217 of the shield
plate 205 and apply a configuration in which the shield plate 205
is thoroughly housed in the interior of the cap body 203 in a state
where the shield plate 205 is positioned at the housing position
P201.
[0161] In a state where the shield plate 205 is positioned at the
shielding position P203, the lowermost end portion of the shield
plate 205 is positioned below a chin of a wearer and then the
shield plate 205 covers almost all of a face of the wearer. More
specifically, when viewed from the front, all of the face of the
wearer is covered with the shield plate 205. The uppermost end
portion of the shield plate 205 is positioned in the interior of
the cap body 203 in the vicinity of the lowermost end portion of
the cap body 203 (the opening portion 209 of the front side of the
cap body 203).
[0162] The guide member 211 is formed of a resin for example and is
integrally constituted to comprise a first side portion 221 and a
second side portion 223. A central portion 219 is formed in a
plate-like shape (curved plate-like shape) to comprise a
sphere-like curved surface (a curved surface having a slightly
smaller radius than that of the shield plate 205, for example)
along the internal surface at the inside of the cap body 203
(internal curved surface of the cap body 203 formed in a convex
sphere-like shape). The first side portion 221 is provided
integrally with the central portion 219 on one end side in the
lateral direction of the central portion 219. The second side
portion 223 is provided integrally with the central portion 219 on
another end side in the lateral direction of the central portion
219.
[0163] The first side portion 221 is constituted of a proximal end
portion side portion (a portion at the central portion 219 side)
225 and a tip end portion side portion 227, and the second side
portion 223 is likewise constituted of a proximal end portion side
portion to portion at the central portion 219 side) 229 and a tip
end portion side portion 231. Further, on the respectively portions
225 and 229, parts of guide portions 213 are formed.
[0164] Further, a tip end portion side portion 227 of the first
side portion 221 and a tip end portion side portion 231 of the
second side portion 223 engage with the cap body 203 (in face
contact with lower internal surfaces at sides of the cap body 203,
for example) so that the guide member 211 is provided integrally
with the cap body 211.
[0165] The shield plate 205 enters into a space formed among the
cap body 203, the central portion 219 and the proximal portion side
portions 225 and 229 of the respective side portions 221 and 223,
thereby being housed in the cap body 203.
[0166] The tip end portion side portion 227 of the first side
portion 221 is formed in a plate-like form (curved plate-like form)
comprising a curved surface in face contact with the lower internal
surface at one side of the cap body 203, and the tip end portion
side portion 231 of the second side portion 223 is likewise formed
in a plate-like form (curved plate-like form) comprising a curved
surface in face contact with the lower internal surface at another
side of the cap body 203.
[0167] The proximal end portion side portion 225 of the first side
portion 221 is constituted to comprise a standing portion 233 and a
connection portion 235. The standing portion 233 is formed in an
elongated plate-like form so to have its lateral direction in a
direction of standing to stand from, and perpendicular to for
example, the tip end portion side portion 227 of the first side
portion 221. The connection portion 235 is formed in an elongated
plate-like form. One end portion in the lateral direction thereof
is provided integrally with the central portion 219 and another end
portion in the lateral direction thereof is provided integrally
with the standing portion 233, thereby connecting the standing
portion 233 with the central portion 219.
[0168] In a state where the guide member 211 is provided,
integrally with the cap body 203, the standing portion 233 stands
in an obliquely forward direction from the internal surface of the
cap body 203 (a direction to the interior of the cap body 203) and
the connection portion 235 (respective surfaces in its thickness
direction of the connection portion 235) extends in substantially
front-and-rear and upper-and-lower directions.
[0169] Likewise the proximal end portion side portion 229 of the
second side portion 223 is constituted of a standing portion 241
and a connection portion 243.
[0170] Further, the guide portion 213 is constituted of one curved
surface (a curved surface of an arc-like shape positioned at a
front side when the guide member 211 is installed in the cap body
203) 237 in the thickness direction of the standing portion 233, an
elongated slot 239 formed on the connection portion 235, one curved
surface (a curved surface of an convex arc-like shape positioned at
a front side when the guide member 211 is installed in the cap body
203) 245 in the thickness direction of the standing portion 241,
and an elongated slot 247 in an arc-like shape formed on the
connection portion 243.
[0171] The engagement portion 215 of the shield plate 205 is
constituted of respective end faces 249, 257 in the lateral
direction of the shield plate 205 and respective engagement pieces
251, 259. The end face 249 is one end face of the shield plate 205
in the lateral direction, is formed in an arc-like shape being
concave with a curvature radius substantially equal to that of the
curved surface 237 of the standing portion 233, gets in line
contact (more accurately, face contact) with the curved surface
237, and engages with the curved surface 237 to form a sliding
contraposition. Further, the end face 257 is another end face of
the shield plate 205 in the lateral direction, is constituted in a
similar way to the end face 249, and engages with the curved
surface 245 of the standing portion 241.
[0172] Further, the engagement piece 251, as shown in FIG. 26 (the
XXXVI-XXXVI cross section in FIG. 23), projects inward relative to
the shield plate 205 at the upper end portion side of one end side
in the lateral direction of the shield plate 205, and is provided
integrally with the shield plate 205. The engagement piece 251 is
formed in an umbrella-like shape comprising a proximal end portion
253 in a cylindrical shape and an umbrella portion 255 formed in a
circular disc-like shape having a larger outer diameter than the
proximal end portion 253. The engagement piece 251 has the proximal
end portion 253 with a diameter slightly smaller than a width of
the elongated slot 239 entering into the elongated slot 239 to
engage therewith with forming a sliding contraposition. Meanwhile
the outer diameter of the umbrella portion 255 is made larger than
the width of the elongated slot 239. Likewise at another side in
the lateral direction of the shield plate 205, the engagement piece
259 is provided and the engagement piece 259 engages with the
elongated slot 247.
[0173] It has a double structure in which the cap body 3 is
disposed outside and the guide member 211 is disposed inside in the
front of the protective cap 201 as shown in FIG. 23 when the guide
member 211 is installed in the interior of the cap body 203. Then
the shield plate 205 enters in between the cap body 203 and the
guide member 211.
[0174] When the guide member 211 is installed in the cap body 203,
a center of the arc-like curved surface 237(245) of the standing
portion 233(241) and a center of the arc-like elongated slot
239(247) of the connection portion 235(243) substantially
correspond to each other, and these centers are positioned at ear
portions of a wearer. Thus the shield plate 205 is made to swing
with having an axis C201 extending in the left-and-right direction
of the protective cap through the ear portions of the wearer as its
center. However, it does not swing to draw a trajectory of a
perfect arc but swings to draw a trajectory of an arc-like shape
close to an arc.
[0175] Further, the curved surface 237(245) of the standing portion
233(241) is positioned at the side of the pivotal center axis C201
relative to the elongated slot 239(247) of the connection portion
235(243) and the curvature radius of the elongated slot 239(247) of
the connection portion 235(243) is larger than the curvature radius
of the curved surface of the standing portion 233(241).
[0176] Further, a cross section of the central portion 219 of the
guide member 211 (the cross section shown in FIG. 23), a cross
section of the shield plate 205 (the cross section shown in FIG.
23), and a cross section of the front side portion of the cap body
203 (the cross section shown in FIG. 23) are formed in a arc-like
shape having the pivotal center axis C201 to be its substantial
center. Further the central portion 219 of the guide member 211 is
disposed outside of the elongated slot 239(247) of the connection
portion 235(243), the shield plate 205 is disposed outside relative
to the central portion 219 of the guide member 211, and the front
side portion of the cap body 203 is dispose outside relative to the
shield plate 205.
[0177] A curvature radius of the central portion 219 of the guide
member 211 is made larger than a curvature radius of the elongated
slot 239(247), a curvature radius of the shield plate 205 is made
larger than a curvature radius of the central portion 219 of the
guide member 211, and a curvature radius of the front side portion
of the cap body 203 is made larger than a curvature radius of the
shield plate 205.
[0178] Further, in the cross section shown in FIG. 23, in a case
where the shield plate 205 is positioned at the housing position
P201, the uppermost end portion of the curved surface of the
standing portion 233(241), the uppermost end portion of the
elongated slot 239(247), the uppermost end portion of the central
portion 219 of the guide member 211, and the uppermost end portion
of the shield plate 205 are positioned at the upper side of the cap
body 203 in the upper-and-lower direction, and positioned at the
center portion of the cap body 203 in the front-and-rear direction.
Further, the lowermost end portion of the curved surface 237(245)
of the standing portion 233(241), the lowermost end portion of the
elongated slot 239(247), the lowermost end portion of the central
portion 219 of the guide member 211, and the lowermost end portion
of the shield plate 205 are positioned close to the lowermost end
portion at the front of the cap body 203.
[0179] Further, the protective cap 201 is provided with a retaining
means 261 for retaining the shield plate 205. The retaining means
261 is to retain the shield plate 205 not to readily move the
shield plate 205 relative to the cap body 203 when the shield plate
205 is positioned at the housing position P201 or the shielding
position P203.
[0180] The retaining means 261 is constituted to comprise
respective cutouts 263,265 as shown in FIG. 27 for example. The
cutout 263 connects with the elongated slot 239(247) at its
uppermost end portion and is then provided with being directed
upward relative to the elongated slot 239(247). The cutout 265
connects with the elongated slot 239(247) at its lowermost end
portion and is then provided directed forward relative to the
elongated slot 239(247).
[0181] Further, when the shield plate 205 is positioned at the
housing position P201, the proximal end portion 253 of the
engagement piece 251(259) enters into the cutout 263, thereby the
shield plate 205 is made not to easily move. Moreover, when the
shield plate 205 positioned at the shielding position P203, the
proximal end portion 253 of the engagement piece 251(259) enters
into the cutout 265, thereby the shield plate 205 is made not to
easily move.
[0182] Further, the protective cap 201 is provided with a stopper
for preventing the central portion in the lateral direction of the
shield plate 205 from moving downward to the extent beyond
necessity when the shield plate 205 moves downward so as to
position at the shielding position P203. The stopper is constituted
of a projection 267 formed on the shield plate 205 and a projection
269 provided on the central portion 219 of the guide member
211.
[0183] By the way, the protective cap 201 is provided with a
not-shown interior body (a hammock for example), and the cap body
203 and the guide member 211 are provided with a plurality of
locking portions 271 for locking the hammock. Among the locking
portions 271, the respective locking portions 271A positioned at
the rear side are provided on the internal surface of the cap body
203 in an integral manner, and the respective locking portions 271B
positioned at the front side are provided on the internal surface
of the guide member 211 in an integral manner.
[0184] Further, in the present embodiment (second embodiment), the
shield plate 205 may be, as with the shield plate 5 in accordance
with the first embodiment, made gradually thinner as going from the
central portion to the peripheral portion.
[0185] Operation for getting the shield plate 205 in and out when
the protective cap 201 is worn will be described hereinafter.
[0186] First, in a state where the shield plate 205 is positioned
at the shielding position P201, a wearer wears the protective cap
201. In a case where he or she needs to position the shield plate
205 at the shielding position P203 and then work, he or she pushes
a lowermost end portion (the visor 217 for example) of the shield
plate 205 forward to a small extent, then the engagement piece
251(259) gets out of the cutout 263, thereby the shield plate 205
is made movable. In this state, he or she has the shield plate 205
to move downward along the elongated slot 239(247), then the
engagement piece 251(259) enters in the cutout 265 and the shield
plate 205 is positioned at the shielding position P203, thereby the
shield plate 205 is made not to easily move from the shielding
position P203.
[0187] On the other hand, in a case where he or she seeks to
changes the shield plate 205 at the shielding position P203 into
the housing position P201, he or she pushes a lowermost end portion
(the visor 217 for example) of the shield plate 205 slightly
forward, then the engagement piece 251(259) gets out of the cutout
265, thereby the shield plate 205 is made movable. In this state,
he or she has the shield plate 205 to move upward along the
elongated slot 239(247), then the engagement piece 251(259) enters
in the cutout 265, thereby the shield plate 205 is made to position
at the shielding position P203.
[0188] According to the protective cap 201, the shield plate 205 is
steadily installed in the cap body 203 and is made to move along
the curved surface of the cap body 203 by means of the guide means
207, thereby preventing failure to attach the shield plate 205 and
allowing elongation of a movement stroke without making the cap
body 203 larger with keeping its conventional shape. Further even
if the length (height) of the shield plate 205 is sufficient to
cover almost all of the face of the wearer, the shield plate 205
can be housed in the interior of the cap body 203 without
interfering with the wearer.
[0189] Further, as the cap body 203 is formed in a
semi-spherical-shell-like form in which a portion covering ears of
a wearer is removed, the protective cap 201 is small-sized and its
weight is reduced, and further it gives a feeling of being
liberated to the wearer. Moreover, as the outside (convex side)
surface and the inside (concave side) surface of the cap body 203
are smoothly curved, stiffness of the cap body 203 is
increased.
[0190] Further, in accordance with the protective cap 201, as the
shield plate 205 comprising a curved surface along the front
internal surface of the cap body 203 and formed in a plate-like
shape is guided by the guide portion 213 of an arc-like shape and
then moves to draw a trajectory of an arc-like shape, its movement
stroke can be further elongated. Even if a shield plate 205 having
a sufficient length to cover almost all of a face of a wearer, it
is further made easier that the shield plate 205 is substantially
housed in the cap body 203 without interfering with the wearer.
[0191] Further, in accordance with the protective cap 201, as the
guide portion 213 of the arc-like shape is provided along the front
internal surface of the cap body 203, a cap body 203 of a
semi-spherical-shell-like shape which will not cover ears of a
wearer can be used. More specifically, if it employs a
configuration which makes the cap body support the shield plate 205
at the pivotal center C201, a pivotal axis for supporting the
shield plate 205 (a pivotal axis positioned at the pivotal center
C201 of the shield plate 205) is required to be additionally
provided, thus the cap body 203 cannot be formed in a
semi-spherical-shell-like shape. However, the protective cap 201
makes it possible that, without providing the cap body 203 with ear
portions, the shape of the cap body 203 can be made to be the
semi-spherical-shell-like shape.
[0192] Further, accordance with the protective cap 201, as the
guide member 211 is constituted as a integral body and is provided
integrally with the cap body 203 so as to be in contact with the
cap body 203 at two portions in the left-and-right direction in the
cap body 203, stiffness of the guide member 211 of itself and
attachment stiffness when the guide member 211 is attached to the
cap body 203 are increased.
[0193] Further, one can provide the locking portion 271B for
locking the hammock constituting the interior body in the interior
of the central portion 219 of the guide member 211 to avoid
interference with the guide member 213 and the shield plate
205.
[0194] Further, in accordance with the protective cap 201, the
shield plate 205 is made to engage with four portions (the
respective surfaces 237,245 and the respective elongated slots
239,247) of the guide member 211 and then move, the shield plate
205 is made to move in a smooth and stable state relative to the
cap body 203.
[0195] By the way, in the protective cap 201, the shield plate 205
is made supported at both ends in the lateral directions thereof
and then move, it can be additionally constituted in that the
shield plate 205 is made supported at its central portion in the
lateral direction and then move. For example, it may be constituted
in that an engagement piece similar to the engagement piece 251 is
provided at a central portion in the lateral direction of the
shield plate 205 and an elongated slot engaging with the engagement
piece (an elongated slot similar to the elongated slot 239) is
provided at the central portion 219.
[0196] Further, as the shield plate, that of a half type covering
only an upper half of a face of a wearer can be used.
Third Embodiment
[0197] FIG. 28 is a drawing showing a summarized configuration of a
protective cap 301 in accordance with a third embodiment of the
present invention, FIG. 29 is drawing showing differences in
outlines of a cap body 303 of the protective cap 301 and a cap body
300 of a widely-used protective cap, and FIG. 30 is a cross
sectional view of the protective cap 301 (a cross sectional view
taken from a plane extending in the front-and-rear and
upper-and-lower directions of the protective cap 301 through a
center of the protective cap 301).
[0198] FIG. 31 is a drawing showing a state where a wearer wears
the protective cap 301. (a) and (b) of FIG. 31 show a state where a
shield plate 305 is positioned at a housing position P301, and (c)
and (d) of FIG. 31 show a state where the shield plate 305 is
positioned at shielding position P303.
[0199] The protective 301 is constituted to comprise a cap body 303
and a shield plate (shield member; face body) 305. The cap body 303
and the shield plate 305 are formed bilaterally symmetrical. The
cap body 303 is provided with ear portions 307 for covering ears of
a wearer. Further the cap body 303 is formed in a bowl-like shape
which is formed so that only a front side of the cap body 303 is
made greater toward the outside as compared with a widely-used
protective cap 300.
[0200] Here, the widely-used cap body 300 is a cap body not
comprising a shield plate but being constituted of a cap body and
an interior body, and is a cap body for a protective cap formed in
requisitely minimum dimensions, for example, which is to be adapted
to a standard of the Ministry of Health, Labour and Welfare (a
standard for a protective cap). As a widely-used cap body, a cap
body 300 (see FIG. 29) of a MP helmet or such with lengths in the
front-and-rear direction of about 260 mm-280 mm can be
exemplified.
[0201] The cap body 303 is formed in a bowl-like shape in which
that ear portions 307 formed in a plate-like shape are added to
that of a semi-spherical-shell-like shape. The thickness of the ear
portions 307 and the thickness of the other portions of the cap
body 303 except the ear portions are substantially common in
thickness. Further, a thickness direction of the ear portions 307
is made to be a left-and-right direction of the cap body 303 (a
direction perpendicular to a paper face of FIG. 28).
[0202] Meanwhile, the cap body 303 is formed in a
semi-spherical-shell-like form and is thus not formed in a perfect
semi-spherical shell form. More specifically, the cap body 303 is,
in a similar way to the cap body 3, formed in a form in which the
curvature radius properly changes to fit it with a shape of a head
of a wearer.
[0203] Further an opening portion (an edge; a lowermost end) 309 of
the cap body 303 is not a perfect circular shape and is formed in a
circle-like shape in which the curvature radius properly changes to
fit it with a shape of a head of a wearer.
[0204] As the cap body 303 is formed in a bowl-like shape, the
external surface and the internal surface of the cap body 303 are
formed in a smooth spherical-surface-like shape in which sharply
curved portions do not exist. Further, as the cap body 303 is
formed in a bowl-like shape in which that of a
semi-spherical-shell-like form is provided with the ear portions
307, the ear portions 307 of the cap body 303 project downward at
the central portions in the front-and-rear direction of the cap
body 303 and it is structured that ears of the wearer are
thoroughly or partly covered with the ear portions 307 when a
standing upright wearer wears the protective cap 301.
[0205] The shield plate 305 is for exampled formed in a similar way
to the shield plate 5, and is constituted of a transparent
(including colored transparency) or translucent member such as a
resin in dimensions capable of covering all of a face of a wearer.
Further the shield plate 305 is formed in a plate-like shape
(curved plate-like shape; spherical-shell-like shape about 1/4)
comprising a sphere-like curved surface along the internal surface
(convex sphere-like curved surface) at the front side of the cap
body 303, and is provided with engagement portions 311 at both end
portions in the left-and-right direction thereof. A guide portion
313 is formed on each ear portion 307 of the cap body 303. As the
engagement portions 311 of the shield plate 305 engage with the
guide portions 313, the shield plate 305 swings to draw a
trajectory of an arc-like shape with having a central axis C301 of
the engagement portions 311 as its pivotal center. The axis C301 is
an axis extending in the left-and-right direction (a direction
perpendicular to a paper face of FIG. 1) of the protective cap 301
through centers of the ear portions 307.
[0206] Here, the housing position p301 is a position where the
shield plate 305 is housed in the interior at the front of the cap
body 303, and the shielding position P303 is a position where the
shield plate 305 covers almost all of a face (a front surface of a
head) of a wearer of the cap body 303.
[0207] Each guide portions 313 is for example constituted of a
circular through hole 315 penetrating each ear portion 307 of the
cap body 303, and each engagement portion 311 is, constituted of a
columnar projection (a projection having an outer diameter slightly
smaller than the through hole) 317 slightly projecting out of the
shield plate 305 at the outside of the shield plate 305 at the
lower portion of the side (each side in the lateral direction) of
the shield plate 305. Further, as the respective projections 317
fit with the respective through holes 315 (see FIG. 33 as a drawing
showing a cross section XXXIII-XXXIII in FIG. 28), the shield plate
305 is made to carry out the aforementioned swing motion.
[0208] Describing the state where the shield plate 305 is
positioned at the housing position P301 in detail, even in this
state, the shield plate 305 is not thoroughly housed in the
interior of the cap body 303 but a lowermost end portion of the
shield plate 305 (a lowermost end portion where a visor 3L9 is
provided) and its vicinities project downward from the lowermost
end portion (an opening portion at the front side of the cap body
3) 309 of the cap body 303 at the front side of the cap body 303.
However, these portions projecting downward do not interfere with a
wearer and the wearer can wear the protective cap 301 without being
aware of existence of the shield plate 305 in his or her visual
field.
[0209] The visor (visor portion) 319, as with the case of the first
embodiment, turns over at the lowermost end portion of the shield
plate 305. More specifically, the visor 319 bends in its reverse
direction (a direction falling apart from a face of a wearer) and
then extends out. Thereby, even if a flying object hits the shield
plate (the shield plate at the shielding position P303) 305, a
situation in which the flying object slides on the shield plate 305
to contact a body of a wearer can be avoided.
[0210] Further, the uppermost end portion of the shield plate 305
is positioned in the vicinity of the top portion of the cap body
303. Meanwhile, it is allowed to omit the visor 319 of the shield
plate 305 and apply a configuration in which the shield plate 305
is thoroughly housed in the interior of the cap body 303 in a state
where the shield plate 305 is positioned at the housing position
P301.
[0211] In a state where the shield plate 305 is positioned at the
shielding position P303, the lowermost end portion of the shield
plate 305 is positioned below a chin of a wearer and then the
shield plate 305 covers almost all of a face of the wearer (see
FIG. 31(c)(d)). More specifically, when viewed from the front, all
of the face of the wearer is covered with the shield plate 305.
Meanwhile, the uppermost end portion of the shield plate 305 is
positioned in the interior of the cap body 303 in the vicinity of
the lowermost end portion of the cap body 303 (a rim at the front
side of the cap body 303).
[0212] Further, the protective cap 301 is provided with an inside
member 321 formed bilaterally symmetrical. The inside member 321 is
provided integrally with the cap body 303 in the interior at the
front side of the cap body 303.
[0213] The inside member 321 is, as shown in FIG. 30 and FIG. 32 (a
perspective view showing a summarized configuration of an internal
member 321), constituted to comprise a central portion 323, a
standing portion 325 and a projecting portion 327. The central
portion 323 is formed in a plate-like shape (curved plate-like
shape; spherical-shell-like shape about 1/4 in size) comprising a
sphere-like curved surface along the internal surface (curved
surface at the inside of the cap body 303 formed in a concave
sphere-like curved shape).
[0214] The standing portion 325 is formed in a plate-like shape in
a form of a "U" letter, and stands from the rearmost end portion of
the central portion 323 in an outer direction of the central
portion 323 (convex direction) with a predetermined height. The
projecting portion 327 is formed in a plate-like shape in a form of
a "U" letter, and projects rearward from the standing portion 325
with a predetermined width.
[0215] Further, as one surface (convex surface at the outside) in
the thickness direction of the projecting portion 327 engages with
(be in face contact with) an internal surface (concave surface) of
the cap body 303, the inside member 321 is provided integrally with
the cap body 303 in the interior at the front side of the cap body
303. Meanwhile, the internal surface of the cap body 303 with which
the projecting portion 327 is in face contact extends shape of a
"U" letter, which starts from the left side of the cap body 303 and
passes through the top portion of the cap body 303 to the right
side of the cap body, at the central portion in the front-and-rear
direction of the cap body 303 so that its width is placed in the
front-and-rear direction.
[0216] It has a double structure in which the cap body 303 is
disposed outside and the inside member 321 is disposed inside in
the front of the protective cap 301 when the inside member 321 is
installed in the interior of the cap body 303. Thus the shield
plate 305 enters into a space formed between the cap body 303 and
the inside member 321 (a space among the central portion 323, the
cap body 303 and the standing portion 325), thereby being
positioned at the housing position 2301 and housed in the cap body
303.
[0217] When the inside member 321 is installed in the cap body 303,
as shown in FIG. 30, a center of the central portion 323 of the
arc-like shape in the inside member 321, a center of the shield
plate 305 of the arc-like shape, a center of the cap body 303 of
the arc-like shape, and a pivotal center C301 of the shield plate
305 are substantially correspondent to each other. Further, a
curvature radius of the cap body 303 is made larger than a
curvature radius of the shield plate 305, and a curvature radius of
the shield plate 305 is made larger than a curvature radius of the
central portion 323 of the inside member 321.
[0218] Further, the protective cap 301 is provided with a retaining
means 329 for retaining the shield plate 305. The retaining means
329 is to retain the shield plate 305 not to readily move the
shield plate 305 relative to the cap body 303 when the shield plate
305 is positioned at the housing position P301 or the shielding
position P303.
[0219] The retaining means 329 is, as shown in FIG. 30 for example,
constituted to comprise respective projections 331, 333, 335, 337.
The projection 331 is formed in a semi-spherical shape and is
provided integrally with the internal surface (concave surface) of
the shield plate 305 at the rearmost end portion in the
front-and-rear direction of the shield plate 305 and at the central
portion in the lateral direction of the shield plate 305. The
projection 333 is formed in a semi-spherical shape and is provided
integrally with the external surface (convex surface) of the inside
member 321 in the vicinity of the rearmost end portion of the
central portion 323 in the front-and-rear direction of the inside
member 321 and at the central portion in the lateral direction of
the inside member 321. The projection 335 is formed in a quarter
spherical shape, and is provided integrally with the external
surface (convex surface) of the inside member 321 at the foremost
end portion of the central portion 323 in the front-and-rear
direction of the inside member 321 and at the central portion in
the lateral direction of the inside member 321 so that a plane 335
A is directed rearward (upward) relative to the inside member 321.
The height of the projection 335 is made higher than the heights of
the other projections 331, 333, 337. The projection 337 is formed
in a semi-spherical shape and is provided integrally with the
external surface (convex surface) of the inside member 321 slightly
rearward (upward) relative to the projection 335 in the
front-and-rear direction of the inside member 321 and at the
central portion in the lateral direction of the inside member
321.
[0220] Further, in a state where the shield plate 305 is positioned
at the housing position P301, the projection 331 is, as shown in
FIG. 30, caught between the projection 333 of the inside member 321
and the standing portion 325 of the inside member 321 so that the
shield plate 305 does not readily swing. As the shield plate 305 is
made swing in an arrow shown in FIG. 30 so as to position the
shield plate 305 positioned at the housing position P301 into the
shielding position P303, the shield plate 305 is positioned at the
shielding position P303 when the projection 331 gets over the
projection 337 so that the shield plate 305 swings and further gets
over the projection 337, and also the projection 331 is caught
between the projection 337 and the projection 335 so that the
shield plate 305 is made not to readily swing.
[0221] Meanwhile, as the projection 335 comprises a plane 335A and
the height of the projection 335 is high, the shield plate 305
positioned at the shielding position P303 (the projection 331
caught between the projection 337 and the projection 335) will not
swing in the arrow shown in FIG. 30 any more.
[0222] By the way, the protective cap 301 is provided with a
not-shown interior body (a hammock for example), and the cap body
303 and the inside member 321 are provided with a plurality of
locking portions 339 for locking the hammock. Among the locking
portions 339, the respective locking portions 339A positioned at
the rear side are provided on the internal surface of the cap body
303 in an integral manner, and the respective locking portions 339B
positioned at the front side are provided on the internal surface
of the inside member 321 in an integral manner.
[0223] Further, in the present embodiment (third embodiment), as
with the shield plate 5 in accordance with the first embodiment,
the shield plate 305 may be gradually reduced in thickness as going
from a central portion to a peripheral portion.
[0224] Operation for getting the shield plate 305 in and out when
wearing the protective cap 301 will be described hereinafter.
[0225] First, in a state where the shield plate 305 is positioned
at the shielding position P301, a wearer wears the protective cap
301. In a case where he or she needs to position the shield plate
305 at the shielding position P303 and then work, he or she pulls
the lowermost end portion (the visor 317 for example) of the shield
plate 305 downward, the shield plate 305 swings and is then
positioned at the shielding position P303.
[0226] On the other hand, in a case where he or she seeks to change
the shield plate 305 at the shielding position P303 into the
housing position P301, he or she pushes the shield plate 305
upward, the shield plate 305 swings and is then positioned at the
housing position P301.
[0227] By the way, in the protective cap 301, the position of the
pivotal center C301 of the shield plate 305 may be constituted to
allow regulation. More specifically, as shown in FIG. 33, a
plurality of through holes 315a-315i similar to the through holes
315 are provided on the ear portions 307, and it may be configured
that one of the through holes 315a-315i (more concretely, two
through holes in the left-and-right direction) is selected and the
projection 317 of the shield plate 305 fits in the selected through
hole. Meanwhile, the respective through holes 315a-315i are
slightly apart from each other, and the respective through holes
315b-315i are for example provided at positions which divide a
circumference around the through hole 315a substantially
equally.
[0228] According to the protective cap 301, as only the front side
of the cap body 303 is made large and the shield plate 305 moves to
draw a trajectory of an arc-like shape having the axis C031 as its
center, the shield plate 305 can be housed in the interior of the
cap body 303 and it is avoided as possible that the whole of the
cap body 303 and the protective cap 301 is made larger and heavier
even if the shield plate is made enough large to cover almost all
of a face of a wearer. Further, as the cap body 303 is formed in a
bowl-like shape, the surfaces at the outside (convex side) and the
inside are bent smoothly and stiffness of the cap body 303 is
increased.
[0229] Further, in the protective cap 301, if the position of the
pivotal center C301 of the shield plate 305 is constituted to allow
regulation, the position of the shield plate 305 relative to the
cap body 303 (in particular, the position of the shield plate 305
at the shielding position P303) can be regulated in accordance with
shapes of a head and a face of a wearer. Then the wearer will
hardly feel uncomfortable and the protective cap is made easier to
use.
[0230] Further, in accordance with the protective cap 301, as the
shield plate 305 is so constituted to enter into the space formed
among the cap body 303, the central portion 323 and the standing
portion 325 and then housed in the interior of the cap body 303, it
is made easy that the locking portion 3395 for locking the interior
body (hammock) is provided so as to avoid interference with the
shield plate 305.
Fourth Embodiment
[0231] FIG. 35 and FIG. 36 are drawings showing a summarized
configuration of a protective cap 351 in accordance with a fourth
embodiment of the present invention, and FIG. 37 is an enlarged
view of a part X in FIG. 36.
[0232] A protective cap 351 in accordance with the fourth
embodiment differs from the protective cap 301 in accordance with
the third embodiment in that the shield plate is divided into two
and installed at the outside of the cap body 353, and the other
points are constituted in substantially the same way as the
protective cap 301 in accordance with the third embodiment.
[0233] More specifically, the protective cap 351 is constituted to
comprise a cap body 353, a first shield plate 355 and a second
shield plate 357.
[0234] The cap body 353 is provided with ear portions 359 for
covering ears to be formed in a bowl-like shape. Describing
further, the bowl-like cap body 353 is formed in the same shape as
a widely used cap body without a shield plate (the widely used cap
body mentioned in the third embodiment) but it has the ear portions
359.
[0235] The first shield plate 355 is formed in a plate-like shape
(a curved plate-like shape; a spherical-shell-like shape of about
1/8) comprising a curved surface (a curved surface of a sphere-like
shape having a larger curvature radius than a curved surface at the
front of the cap body 353) along an external surface at the front
side of the cap body 353 curved surface at the outside of the cap
body 353 formed in a convex sphere-like shape). At both sides in
the lateral direction of the first shield plate 355, engagement
portions 363 constituted of through holes 361 of a circular shape
for example are formed. The engagement portions 363 engage with
guide portions 367 constituted of columnar projections 365
projecting from the external surface of the cap body 353 at both
ends in the lateral direction of the cap body 353 for example.
Further the first shield plate 355 is made to swing to draw a
trajectory of an arc-like shape around the engagement portions 363
between a push-up position P305 and a shielding position P307.
[0236] Meanwhile, the push-up position P305 is a position where the
first shield plate 355 is pushed up to the exterior at the front
side of the cap body 353, and the shielding position P307 is a
position where the first shield plate 355 covers almost the upper
half of a face of a wearer (a front face of a head).
[0237] The second shield plate 357 is formed in a plate-like shape
(a curved plate-like shape; a spherical-shell-like shape of about
1/8) comprising a curved surface (a curved surface of a sphere-like
shape having a larger curvature radius than the first shield plate
355) along the external surface at the front side of the cap body
353 (the curved surface at the outside of the cap body 353 formed
in the convex sphere-like shape). At both sides in the lateral
direction of the second shield plate 357 also, through holes 361
(engagement portions 363) are formed in a similar way to the first
shield plate 355 and the through holes 361 engage with the
projections 365 (the guide portions 367). Further the second shield
plate 357 is positioned at the outside of the first shield plate
355 (in particular, when it is positioned at the shielding position
P311, it covers the first shield plate 355 at the outside of the
first shield plate 355 positioned at the push-up position P305),
and is made to swing to draw a trajectory of an arc-like shape
around the engagement portions 363 between a push-up position P309
and a shielding position P311.
[0238] Meanwhile, the push-up position P309 is a position where the
second shield plate 357 is pushed up to the exterior at the front
side of the cap body 353, and the shielding position P311 is a
position where the second shield plate 357 covers almost the lower
half of a face of a wearer (a front face of a head).
[0239] Further, the first shield plate 355 positioned at the
shielding position P305 is, as a portion at the uppermost end
portion thereof gets contact with a visor 360 of the cap body 353,
made not to move downward further. Further, the second shield plate
357 positioned at the shielding position P311 is, as a stopper 369
provided in the second shield plate 357 gets in contact with a
stopper 371 provided in the first shield plate 355, made not to
move downward further.
[0240] Meanwhile, the stopper 369 is formed of a bent portion
formed by bending the second shield plate 357 at its uppermost end
portion inward. The stopper 371 is formed of a bent portion formed
by bending the first shield plate 355 at its lowermost end portion
inward.
[0241] Further, in the present embodiment (fourth embodiment), as
with the shield plate 5 in accordance with the first embodiment,
the shield plate 355 may be gradually reduced in thickness as going
from a central portion to a peripheral portion.
[0242] According to the protective cap 351, in a state where the
respective shield plates 355, 357 are positioned at the push-up
positions P305, P309, as the second shield plate 357 is positioned
at the outside of the first shield plate 355 for mainly covering
portions of eyes of a wearer to cover the first shield plate 355,
the first shield plate 355 is hardly given a scratch. More
specifically, when a wearer of the protective cap 351 does not use
the respective shield plates 355, 357 for example, even if he or
she inadvertently bang the second shield plate 357 against any
obstacle, the first shield plate 355 is prevented from being
hurt.
[0243] Thereby, when a wearer of the protective cap 351 uses the
respective shield plates 355, 357, there is no scratch on the first
shield plate 355 which mainly covers the portions of the eyes and
the wearer can assure a good visual field.
[0244] By the way, the positions of the shield plates may be
reversed in regard to the outer and inner sides in the
aforementioned third and fourth embodiments. More specifically, in
the third embodiment, the cap body is made to be that of a widely
used type and the shield plate may be disposed at the outside as
with the fourth embodiment. Further, in the fourth embodiment, the
front side of the cap body may be made larger than that of the
widely used cap body and the shield plate may be disposed at the
outside.
Fifth Embodiment
[0245] What mainly differs in a protective cap 501 in accordance
with the fifth embodiment as compared with the protective cap 1 in
accordance with the first embodiment and the protective cap 201 in
accordance with the second embodiment is a configuration
(structure) of a guide means 505 for guiding a shield plate 503.
The other points are constituted substantially in the same way as
the protective cap 1 in accordance with the first embodiment and
the protective cap 201 in accordance with the second embodiment,
and serve substantially the same effects.
[0246] The shield plate 503 guided by the guide means 505 is
constituted substantially in the same way as those in accordance
with the aforementioned respective embodiments (the first
embodiment for example). A visor 217 comprising a concave portion
275 is provided as with the protective cap 1 in accordance with the
first embodiment and the protective cap 201 in accordance with the
second embodiment, and moves between a housing position P501 and a
shielding position P503 with having an axis C501 as its pivotal
center.
[0247] FIG. 38 is an exploded perspective view showing a summarized
configuration of the protective cap 501 in accordance with the
fifth embodiment.
[0248] The protective cap 501 in accordance with the fifth
embodiment is constituted to comprise a guide member 509
constituting a cap body 507 and a guide means 505, a shield plate
503, a shock absorber (a shock absorbing liner) 513, a chin-strap
515 and an interior body (hammock) 517. The shock absorbing 513 is,
for example, formed of a foamed polystyrene in a bowl-like shape.
Further, inside the cap body 507, after installing an assembly 511
of the guide member 509 and the shield plate 503 in the cap body
507, by installing the shock absorbing member 513 in the inside of
the cap body 507 and the assembly 511, and thereafter installing
the chin-strap 515 and the hammock 517 in the cap body 507 and the
guide member 509, then the protective cap 501 is assembled and then
generated.
[0249] Meanwhile, in the protective caps in accordance with the
aforementioned embodiments, a shock absorbing member and a
chin-strap are not mentioned, however, in the protective caps in
accordance with these embodiments, a configuration in which a shock
absorbing member and a chin-strap is provided may be applied.
[0250] The cap body 507 is constituted in substantially the same
way as the cases of the protective cap 1 in accordance with the
first embodiment and the protective cap 201 in accordance with the
second embodiment. More specifically, the protective cap 507 is to
protect a head of a wearer and is for example constituted of a
material such as resin and formed in a bowl-like shape (a
semi-spherical-shell-like shape for example) as shown in FIG. 46 (a
drawing showing a summarized configuration of the cap body 507).
Meanwhile, FIG. 46(a) is a side view of the cap body 507, FIG.
46(b) is an elevational view of the cap body 507 and also a view
viewed from an arrow XLVIB in FIG. 46(a), and FIG. 46(c) is a
bottom view of the cap body 507 and also a view viewed from an
arrow XLVIC in FIG. 46(a).
[0251] The cap body 507 of the protective cap 501 is constituted of
a cap body main body portion 519 and a cap body visor portion 521,
and is formed in two colors for example. The cap body main body
portion 519 is constituted of an opaque resin, and the cap body
visor portion 521 is constituted of a transparent (including
colored transparency) resin or a translucent resin. In the
protective caps in accordance with the respective embodiments, the
cap body may be constituted of a cap body main body portion and a
cap body visor portion.
[0252] The shield plate 503 is, as described above, constituted
substantially in a similar way to that of the protective cap 201 in
accordance with the first embodiment but a portion related to the
guide means 505 (a portion engaging with the guide member 509).
[0253] Here, the guide means 505 will be described in more detail
hereinafter.
[0254] FIG. 39 is a cross sectional view showing a summarized
configuration of the protective cap, FIG. 40 is an elevational view
of the protective cap, viewed from an arrow XL in FIG. 39, and FIG.
41 is a bottom view of the protective cap, viewed from an arrow XLI
in FIG. 39.
[0255] FIG. 43 and FIG. 44 are drawings showing an assembly 511 of
the guide member 509 and the shield plate 503, in which FIG. 43(a)
is a side view of the assembly 511, FIG. 43(b) is a plan view of
the assembly 511 and also a view viewed from an arrow XLIIIB in
FIG. 43(a) FIG. 44(a) is a bottom view of the assembly 511 and also
a view viewed from an arrow XLIVA in FIG. 43(a), and FIG. 44(b) is
a drawing showing a cross section XLIVB-XLIVB in FIG. 43(b).
[0256] FIG. 45 is a drawing showing details of a guide portion 523
and such of the guide member 509. FIG. 45(a) is an enlarged view of
a part XLVA in FIG. 44(b). FIG. 45(b) is a view viewed from an
arrow XLVB in FIG. 45(a), or an enlarged view of a part XLVB in
FIG. 49(b). Meanwhile, in FIG. 45(a), the shield plate 503 and such
are drawn, however, in FIG. 45(b), illustration of the shield plate
503 and such is omitted and only the guide member 509 is drawn.
[0257] FIG. 49 and FIG. 50 are drawings showing the guide member
509, in which FIG. 49(a) is a side view of the guide member 509,
FIG. 49(b) is a plan view of the guide member 509 and also a view
viewed from an arrow XLIXB in FIG. 49(a), FIG. 50(a) is an
elevational view of the guide member 509 and also a view viewed
from an arrow LA in FIG. 49(a), FIG. 50(b) is a drawing showing a
cross section LB-LB in FIG. 50(a), and FIG. 50(c) is a drawing
showing a cross section LC-LC in FIG. 50(a).
[0258] FIG. 52 and FIG. 53 are drawings showing the shield plate
503, in which FIG. 52(a) is an elevational view of the shield plate
503, FIG. 52(b) is a plan view of the shield plate 503 and also a
view viewed from an arrow LIIB in FIG. 52(a), FIG. 52(c) is a
partial view viewed from an arrow LIIC in FIG. 52(b), FIG. 52(d) is
a partial cross sectional view of the shield plate 503 and also a
view showing a cross section LIID-LIID in FIG. 52(b), FIG. 53(a) is
a side view of the shield plate 503 and also a view viewed from an
arrow LIIIA in FIG. 52(a), and FIG. 53(b) is a drawing showing a
cross section LIIIB-LIIIB in FIG. 52(a). Meanwhile, a part 510
shaded in FIG. 52(a) and FIG. 53(a) is an optical property range in
the ANSI regulation (a range which provides good optical properties
for a wearer of the protective cap 501 viewing an object via the
shield plate 503).
[0259] The guide means 505 is constituted to comprise guide
portions 523 provided in the guide member 509 for example
constituted of a resin, and engagement portions 525 provided in the
shield plate 503 constituted of a transparent or translucent
resin.
[0260] The guide member 509 comprises a central portion 527 having
a sphere-like curved surface to form a plate-like shape, and the
guide portions 523 are formed at the central portion 527. Further,
the guide portions 523 are formed in an elongated shape to guide
the shield plate 503 when the shield plate 503 moves between the
housing position P501 and the shielding position P503 and are
provided in the plural number. The guide portions 523 run
substantially in parallel with each other and are provided close to
the center of the central portion 527 in its lateral direction
(left-and-right direction).
[0261] Describing in more detail, the central portion 527 is formed
in a spherical-shell-of-quarter-like shape. Here a
spherical-shell-of-quarter (quarter-spherical-shell) shape is a
body formed by the following way. First, from a first sphere of a
predetermined radius, a body (spherical-shell) of a shape in which
a second sphere having a common center with the first sphere and a
slightly smaller radius than the first sphere is removed therefrom
is obtained.
[0262] Next, the spherical-shell is divided by a first plane
through the center, or its vicinity, of the respective spheres into
two, and then a semi-spherical-shell as one of the two bodies is
obtained.
[0263] Next, the semi-spherical-shell is divided by a second plane
through the center, or its vicinity, of the respective spheres and
substantially perpendicular to the first plane into two, and then a
quarter-spherical-shell as one of the two bodies is obtained.
Meanwhile, as the guide member 509 is to be installed in the
interior (inside) of the cap body 507, a curvature radius (a
curvature radius of the aforementioned first sphere) of the central
portion 527 of the guide member 509 is made slightly smaller than a
curvature radius of the cap body 507.
[0264] The central portion 527 is formed in a
"quarter-spherical-shell-like" form and is thus not formed in a
perfect quarter-spherical-shell form. More specifically, the
central portion 527 is as with the cap body 507, formed in a shape
in which the curvature radius properly changes to fit it with a
shape of a head of a wearer.
[0265] End portions of the central portion 527 are not formed in a
perfect arc form but are formed in an arc-like shape in which the
curvature radius properly changes to fit it with a shape of a head
of a wearer. Here a portion (first semi-circular-end portion curved
line 529) in an arc-like form (semi-arc-like form) formed, by
dividing by the aforementioned first plane and a portion (second
semi-circular-end portion curved line 531) in an arc-like form
(semi-arc-like form) formed by dividing by the aforementioned
second plane are referred to as the end portions of the central
portion 527.
[0266] The first semi-circular-end portion curved line 529 is for
example positioned substantially on the first plane and forms to
have substantially no convexes and concaves in a direction
perpendicular to the first plane. Meanwhile, as the central portion
527 comprises a thickness (a difference between the radius of the
first sphere and the radius of the second sphere), the first
semi-circular-end portion curved line 529 can be, to be more
precise, referred to as a first semi-circular-end portion curved
surface.
[0267] The second semi-circular-end portion curved line 531 for
example goes in and out of the second plane in a direction
perpendicular to the second plane. More specifically, there are
some convexes and concaves in the direction perpendicular to the
second plane. Meanwhile, as with the first semi-circular-end
portion curved line 529, the second semi-circular-end portion
curved line 531 can be, to be more precise, referred to as a second
semi-circular-end portion curved surface.
[0268] In a state where the guide member 509 is installed in the
cap body 507, the central portion 527 of the guide member 509 is
slightly deviated from the cap body 507 in the front inside of the
cap body 507 and is then provided integrally with the cap body 507.
Thereby a space 533 of a quarter-spherical-shell-like form having a
predetermined thickness thicker than a thickness of the cap body
507 and a thickness of the central portion 527, and the shield
plate (the shield plate positioned at the housing position P501)
503 is made to enter into the space 533 of the
quarter-spherical-shell-like form.
[0269] Describing further, the first semicircular-end portion
curved line 529 is slightly apart from the internal wall of the cap
body 507 and also along the internal wall of the cap body 507, and
extends from the vicinity of a left end of a circular rim
positioned at the lowermost end of the cap body 507 through the
vicinity of a point just above the cap body 507 to the vicinity of
a right end of a circular rim positioned at the lowermost end of
the cap body 507. More specifically, the first semi-circular-end
portion curved line 529 extends from a point above a left ear of a
wearer through the vicinity of a head top of the wearer to a point
above a right ear of the wearer.
[0270] Further, the second semi-circular-end portion curved line
531 is slightly apart from the front semi-circular rim at the
lowermost end of the cap body 507 and also along the front
semi-circular rim at the lowermost end of the cap body 507, and
extends from the vicinity of the left end of the circular rim at
the lowermost end of the cap body 507 through the vicinity of the
front end of the rim of the cap body 507 to the right end of the
circular rim at the lowermost end of the cap body 507. More
specifically, the second semi-circular-end portion curved line 531
extends from a point above the left ear of the wearer through the
vicinity of a forehead of the wearer to a point above the right ear
of the wearer.
[0271] The guide portions 523 provided at the central portion 527
of the guide member 509 are for example provided in the number of
three. The respective guide portions 523 are constituted of through
holes (through holes penetrating the central portion 527 in its
thickness direction) 535, 537, 539 of respectively elongated
circular forms and are provided at the center, the left side and
the right side of the central portion 527 in the lateral
direction.
[0272] The guide portions 523 (through holes 535) provided at the
center of the central portion 527 is formed from the vicinity of
the center of the second semi-circular-end portion curved line 531
to the vicinity of the center of the first semi-circular-end
portion curved line 529. More specifically, the through hole 535
provided at the center keeps the position of the center in the
sideways direction (lateral direction; left-and-right direction) to
extend from the vicinity of the center of the forehead of the
wearer through a center of a frontal portion of the wearer to the
vicinity of the head top of the wearer.
[0273] The left guide portions 523 (through holes 537) are provided
in parallel with the through hole 535 provided at the center and is
formed from the vicinity of the obliquely front portion at the left
side of the second semi-circular-end portion curved line 531 to the
vicinity of the obliquely upper portion of the left side of the
first semi-circular-end portion curved line 529. More specifically,
the through hole 537 provided at the left side extends from the
vicinity of the left front portion of a chin of a wearer through an
obliquely left front portion of a frontal portion of the wearer to
the vicinity of an obliquely left upper portion of a head top
portion of the wearer.
[0274] The right guide portions 523 (through holes 539) are
provided symmetrical with the through hole 537 at the left side
having the through hole 535 at the center interposed therebetween.
More specifically, the right through hole 539 is provided
symmetrical with the left through hole 537 relative to a plane
extending in the upper-and-lower and front-and-rear directions
through a center of the guide member 509.
[0275] Here, positional relations of the three guide portions 523
(through holes 535, 537, 539) will be described in more detail
hereinafter. For convenience of explanation, existence of the
respective side portions 541, 543 (see FIG. 39 and such) of the
guide portion will be neglected (it is supposed that the side
portions 541, 543 of the guide member 509 do not exist).
[0276] Intersection points between respective extrapolations of the
three through holes 535, 537, 539 (central lines of the elongated
circular through holes 535, 537, 539 in the lateral direction which
are elongated in the longitudinal direction of the through holes
535, 537, 539) and the second semi-circular-end portion curved line
531 will be referred to as a lower portion left side intersection
point 545, a lower portion central intersection point 547 and a
lower portion right side intersection point 549, respectively (see
FIG. 49(a), (b), FIG. 50(a)).
[0277] Then a distance between a left end 551 of the second
semi-circular-end portion curved line 531 (a left end consistent
with a left end of the first semi-circular-end portion curved line
529; see FIG. 49(a)) and the lower portion left side intersection
point 545 is equal to or slightly larger than a distance between
the lower portion left side intersection point 545 and the lower
portion central intersection point 547 (a distance along the second
semi-circular-end portion curved line 531).
[0278] Further, likewise, a distance between a right end 553 of the
second semi-circular-end portion curved line 531 (a right end
consistent with a right end of the first semi-circular-end portion
curved line 529; see FIG. 49(a)) and the lower portion right side
intersection point 549 (a distance along the second
semi-circular-end portion curved line 531) is equal to or slightly
larger than a distance between the lower portion right side
intersection point 549 and the lower portion central intersection
point 547 (a distance along the second semi-circular-end portion
curved line 531).
[0279] Further, intersection points between the respective
extrapolations of the three through holes 535, 537, 539 and the
first semi-circular-end portion curved line 529 will be referred to
as an upper portion left side intersection point 555, an upper
central intersection point 557, and an upper portion right side
intersection point 559, respectively, as shown in FIG. 49(b).
[0280] Then a distance between the left end 551 of the first
semi-circular-end portion curved line 529 and the upper portion
left side intersection point 555 is equal to or slightly larger
than a distance between the upper portion left side intersection
point 55 and the upper portion central intersection point 557 (a
distance along the first semi-circular-end portion curved line
529).
[0281] Further, likewise, a distance between the right end 553 of
the first semi-circular-end portion curved line 529 and the upper
portion right side intersection point 559 (a distance along the
first semi-circular-end portion curved line 529) is equal to or
slightly larger than a distance between the upper portion right
side intersection point 559 and the upper portion central
intersection point 557 (a distance along the first
semi-circular-end portion curved line 529).
[0282] Thus as the guide portions 523 are provided, the guide
portions 523 (through holes 535, 537, 539) are provided to extend
in the upper-and-lower and front-and-rear directions at the central
portion side of the central portion 527 (in the lateral direction
and close to the central portion).
[0283] Meanwhile a configuration in which the guide portion 523
(through hole 535) at the center is omitted and the guide portions
523 are provided in two may be used, or a configuration in which
the guide portion 523 (through hole 535) at the center is provided
in two and one of the guide portions is slightly moved leftward
relative to the center and the other is slightly moved rightward
relative to the center so that four guide portions (elongated
circular through holes) may be used. Further, a configuration in
which five guide portions elongated in the upper-and-lower and
front-and-rear directions are provided at the side of the center of
the central portion 527 (close to the center in the lateral
direction) may be used.
[0284] Further, the guide member 509 is constituted to comprise the
aforementioned central portion 527 and a first side portion (side
portion at the left side) 541 in a plate-like form and a second
side portion (side portion at the right side) 543 in a plate-like
form. The first side portion 541 is provided integrally with the
central portion 527 at one end portion side (left side) in the
lateral direction of the central portion 527 and at the lower side
of the central portion 527. The second side portion 543 is provided
integrally with the central portion 527 at another end portion side
(right side) in the lateral direction of the central portion 527
and at the lower side of the central portion 527.
[0285] Further, a pair of central portion engagement portions 561
(see FIG. 49(b)) engage with a pair of central portion
to-be-engaged portions 563 (see FIG. 46(c)), first side portion
engagement portions 565 at the left (see FIG. 49(a)) engage with
first side portion to-be-engaged portions 567 (see FIG. 46(c)), and
second side portion engagement portions 569 (see FIG. 49(a)) at the
right engage with second side portion to-be-engaged portions 571
(see FIG. 46(c)), thereby the guide member 509 is constituted to be
provided integrally with the cap body 507.
[0286] The pair of central portion engagement portions 561 are
formed in the vicinity of the respective side portions 541, 543 on
the central portion 527, and the pair of central portion
to-be-engaged portions 563 are provided at the sides of the cap
body 507. The first side portion engagement 565 is provided on the
first side portion 541, and the first side portion to-be-engaged
portion 567 is provided at the leftward obliquely rear side of the
cap body 507. The second side portion engagement portion 569 is
provided on the second side portion 543, and the second side
portion to-be-engaged portion 571 is provided at the rightward
obliquely rear side of the cap body 507.
[0287] Describing in more detail, the first side portion 541 is
farmed with a thickness substantially identical to the central
portion 527 in a short belt-like form. Further, one end portion in
the longitudinal direction of the first side portion 541 is
connected to the lowermost end portion side (left and lower end
portion side) of the first semi-circular-end portion curved line
529. Further, the second side portion 543 is provided symmetrical
to the first side portion 541 relative to a plane extending in the
upper-and-lower and front-and-rear direction through the center of
the guide member 509. Thereby, substantially on an extrapolation at
the left of the second semi-circular-end portion curved line 531 of
the central portion 527 positioned is one end portion (lower end
portion) in the lateral direction of the first side portion 541,
and substantially on an extrapolation at the right of the second
semi-circular-end portion curved line 531 of the central portion
527 positioned is one end portion (lower end portion) in the
lateral direction of the second side portion 543.
[0288] The guide member 509 is detachably attached to the cap body
507, and as the pair of central portion engagement portions 561
formed on the central portion 527 of the guide member 509 engage
with the pair of central portion to-be-engaged portions 563
provided on the cap body 507, the guide member 509 installed on the
cap body 507 is made uneasy to separate from the cap body 507.
[0289] The central portion engagement portions 561 are for example
constituted of first central portion engagement portions
(projections slightly projecting outward from the central portion
527) 573 (see FIG. 49(a)) acknowledged as a rigid body and second
central portion engagement portions 575 (see FIG. 49(a)) having
elasticity. The central portion to-be-engaged portions 563 are
constituted of portions 577 (projections slightly projecting from
the inner wall of the cap body toward the interior of the cap body
507; see FIG. 46(c), FIG. 48) acknowledged as rigid bodies.
Meanwhile FIG. 48(a) is a side view of the central portion
to-be-engaged portion 563 and FIG. 48(b) is a view viewed from an
arrow XLVIIIB in FIG. 48(a).
[0290] Further when the guide member 509 is installed on the cap
body 507 (when the first central portion engagement portions 573
are made engaged with the central portion to-be-engaged portions
563), the second central portion engagement portions 575 butt on
the cap body 507 (the central portion to-be-engaged portions 563
and its peripheries) to elastically deform. After installing the
guide member 509 on the cap body 507 (after having the first
central portion engagement portions 573 engaging with the central
portion to-be-engaged portions 563), the second central portion
engagement portions 575 are made to restore the original shape. By
the restored second central portion engagement portions 575, the
guide member 509 once installed on the cap body 507 is made uneasy
to separate from the cap body 507.
[0291] More specifically, when the shield plate 503 is in motion or
such for example, even in a case where an external force is loaded
on the cap body 507, the guide member 509 or the shield plate 503,
the guide member 509 is made to uneasy to separate from the cap
body 507. Meanwhile the central portion engagement portions 561 and
the central portion to-be-engaged portions 563 are provided at
positions where they do not interfere with the shield plate
503.
[0292] Meanwhile FIG. 42(a) is a drawing showing a state where the
central portion engagement portions 561 of the guide member 509
engage with the central portion to-be-engaged portions 563 of the
cap body 507 and is a drawing showing a partial cross section
XLIIA-XLIIA shown in FIG. 41.
[0293] A value of a length of the first side portion 541 in a
band-like form or the second side portion 543 is slightly smaller
than a value of a half of a length of the second semi-circular-end
portion curved line 531. The first side portion engagement portion
55 is constituted of two through holes 579, 581 penetrating the
first side portion 541 in the thickness direction.
[0294] One through hole (rear through hole) 581 of the two through
holes 579, 581 constituting the first side portion engagement
portions 565 is provided at the vicinity of a tip end portion of
the first side portion 541 (an end portion opposed to the central
portion 527 in the longitudinal direction of the first side portion
541) and another through hole (front through hole) 579 of the two
through holes 579, 581 constituting the first side portion
engagement portion 565 is provided in between the central portion
engagement portions 561 in the longitudinal direction of the first
side portion 541 and the rear through holes 581 (substantially at
the central portion for example).
[0295] The second side portion engagement 569 is also, as with the
case of the first side portion engagement portion 565, constituted
of a rear through hole 581 and a front through hole 579, and the
respective through holes 579, 581 of the side portion engagement
portion 569 are provided symmetrical to the respective through
holes 579, 581 of the first side portion engagement portion 565
relative to a plane extending in the upper-and-lower and
front-and-rear directions through the center of the guide member
509.
[0296] The first side portion to-be-engaged portion 567 is as shown
in FIG. 46(c) and FIG. 47 constituted of projections (a front side
projection and a rear side projection) 583 slightly projecting from
the inner wall of the cap body 507 at the vicinity of an opening
portion (a rim at the lowermost end portion) of the cap body 507
toward the interior of the cap body 507. The second side portion
to-be-engaged portion 571 is provided symmetrical with the first
side portion to-be-engaged portion 567 relative to a plane
extending in the upper-and-lower and front-and-rear direction
through the center of the cap body 507. More specifically, the side
portion to-be-engaged portions 567, 571 are constituted of two
front side projections 583 and two rear side projections 583.
[0297] Meanwhile, FIG. 47(a) is a side view of the side portion
to-be-engaged portion 567, 571 and a later described cap body
locking portion 585, FIG. 47(c) is a view viewed from an arrow
XLVIIC in FIG. 47(a), FIG. 47(b) is a view viewed from an arrow
XLVIIE in FIG. 47(c), and FIG. 47(d) is drawing showing a cross
section XLVIID-XLVIID in FIG. 47(b).
[0298] In a state where the first side portion engagement portions
565 engage with the first side portion to-be-engaged portions 567,
the first side portion 541 is in contact with the inner wall of the
cap body 507. Further, in a state where the first side portion
engagement portions 565 engage with the first side portion
to-be-engaged portions 567, the guide member 509 (first side
portion 541) is limited in its movement in the upper-and-lower
direction relative to the cap body 507 and is allowed to slightly
move in the front-and-rear direction of the cap body 507 (a
direction toward inner peripheries of the cap body 507) relative to
the cap body 507. Meanwhile movement of the cap body 507 in the
thickness direction is constituted to be regulated by installing
the hammock 517 in the cap body 507. A state where the second side
portion engagement portion 569 engages with the second side portion
to-be-engaged portion 571 is similar to a state where the first
side portion engagement portions 565 engage with the first side
portion to-be-engaged portions 567.
[0299] In a state where it is finished to install the guide member
509 in the cap body 507, the first side portion engagement portions
565 engage with the first side portion to-be-engaged portions 567,
the second side portion engagement portions 569 engage with the
second side portion to-be-engaged portions 571, and the central
portion engagement portions 561 engage with the central portion
to-be-engaged portions 563. Further, the guide member 509 is firmly
installed in the cap body 507.
[0300] Further, in a state where it is finished to install the
guide member 509 in the cap body 507, a rim at the lower side of
the guide member 509 (a lowermost end portion of the second
semi-circular-end portion curved line 531 and the respective side
portions 541, 543) extends along a rim of the cap body 507 at the
vicinity of the inside of the rim (opening portion) of the cap body
507. Further, in a state where it is finished to install the guide
portion 509 in the cap body 507, when viewing the cap body 507 and
the guide member 509 from these lower side toward these upper side,
the rim of the cap body 507 is formed in a circle-like form (a
circle-like form having a diameter in the front-and-rear direction
larger than a diameter in the lateral direction). As compared
therewith, the guide member 509 is formed in a horseshoe shape
having a narrow portion unconnected at the rear (tip end portions
of the respective side portions 541, 543 are slightly apart from
each other). Meanwhile, the guide member 509 is so constituted as
to be a circle-like form as with the cap body 507.
[0301] At the first side portion to-be-engaged portions 567 and at
the side portion to-be-engaged portions 571 formed are locking
portions (cap body locking portion constituted of four projections)
585 constituted of projections having a projecting length (a
projecting length toward the interior of the cap body 507) than the
projections 583 constituting the to-be-engaged portions 567, 571
(see FIG. 46(c), FIG. 47). Cap body engagement portions 585 are
portions for locking the hammock 517.
[0302] At the inside of the central portion 527 of the guide member
509 and at the vicinity of the second semi-circular-end portion
curved line 531 formed are locking portions (guide member locking
portions constituted of four projections) constituted as similar to
the cap body locking portions 585 (see FIG. 49(b) and FIG. 51).
Guide member locking portions 587 are also portions for locking the
hammock 517.
[0303] Meanwhile, FIG. 51(a) is a side view of the guide member
locking portion 587 which is positioned at the front among the
guide member locking portions, FIG. 51(c) is a view viewed from an
arrow LIC in FIG. 51(a), FIG. 51(b) is a view viewed from an arrow
LIB in FIG. 51(c), and FIG. 51(d) is a drawing showing a cross
section LID-LID in FIG. 51(b).
[0304] Moreover, FIG. 51(e) is a side view of the guide member
lacking portion 587 which is positioned at the front among the
guide member locking portions, FIG. 51(g) is a view viewed from an
arrow LIG in FIG. 51(e), FIG. 51(f) is a view viewed from an arrow
LIF in FIG. 51(g), and FIG. 51(h) is a drawing showing a cross
section LIH-LIF in FIG. 51(g).
[0305] The guide member locking portions 587 of the guide member
509 are provided symmetrical relative to a plane extending in the
upper-and-lower and front-and-rear directions through the center of
the guide member 509. Thereby, in a state where it is finished to
install the guide member 509 in the cap body 507, the locking
portions 585, 587 are provided at eight points in total.
[0306] Further, in a state where it is finished to install the
guide member 509 in the cap body 507, when to-be-engaged portions
589 of the hammock 517 are locked to the cap body engagement
portions 585 and the guide member locking portions 587 so as to
finish installation of the hammock 517 in the cap body 507, it is
made that the respective side portions 541, 543 of the guide member
509 is caught between the cap body 507 and the to-be-engaged
portions 589 of the hammock 517 so that the respective side
portions 541, 543 of the guide member 509 get contact on the inner
wall of the cap body 507, thereby the respective side portions 541,
543 of the guide portion 509 are fixed to the cap body 507 and then
installed therein as described above (see FIG. 42(b) and FIG.
42(c)). Meanwhile, FIG. 42(b) is a drawing showing a cross section
XLIIB-XLIIB in FIG. 41 and FIG. 42(c) is a drawing showing a cross
section XLIIC-XLIIC in FIG. 41.
[0307] The respective side portions 541, 543 are so formed that
these corner portions are rounded. More specifically, outlines of
two corner portions (corner portions positioned at both end
portions in the upper-and-lower direction) at the tip end portions
(tip end portions opposed to the central portion 527) in the
longitudinal direction of the first side portion 541 and the second
side portion 543 are formed in a quarter arc-like form when viewed
from the thickness direction of the side portions 541, 543 (see the
reference sign 591 in FIG. 49(a)). Further, at the other portions
of the side portions 541, 543 (central portions in the longitudinal
direction and lowermost end portions in the upper-and-lower
direction), corner portions are formed to be rounded (see the
reference sign 593 in FIG. 49(a)).
[0308] As the corner portions of the respective side portions 541,
543 are formed to be rounded, damage to the guide member 509 by
stress concentration can be prevented, and scratches on the cap
body 507, the shield plate 503 and a wearer of the protective cap
501 by the guide member 509 can be prevented.
[0309] By the way, the guide portions 523 of the guide member 509
are, as described above, constituted of the three elongated
circular through holes 535, 537, 539 for example. In accordance
with this, the engagement portions 525 of the shield plate 503 are
constituted of three columnar portions 595 (see FIG. 45).
[0310] Further, as the columnar portions 595 constituting the
engagement portions 525 respectively engage with the three through
holes 535, 537, 539 constituting the guide portions 523 of the
guide member 509 (the columnar portions 595 enter into the through
holes 535, 537, 539), the shield plate 503 is guided to move
between the housing position P501 and the shielding position
P503.
[0311] Describing in more detail, the thickness B501 of the
elongated through holes 535, 537, 539 is very slightly larger than
the outer diameter D501 of the columnar portions 595 (see FIG.
45(b)). Further, at both end portions of the columnar portions 595,
disc-like flange portions 599, 601 larger than the columnar
portions 595 in diameter are formed integrally so as to form an
engagement member 597 (see FIG. 45(a)).
[0312] At the uppermost end portion of the shield plate 503, as
shown in FIG. 52(a), semi-disc-like installation portions 603 for
installation of the engagement member 597 are formed integrally. At
the central portions of the semi-disc-like installation portions
603 formed are through holes (through holes, the inner diameter of
which is slightly larger than the outer diameter D501 of the
columnar portions 595 of the engagement member 597) 605 penetrating
the semi-disc-like installation portions 603 in its thickness
direction. Meanwhile, the installation portions 603 and the through
holes 605 are provided at three sites in accordance with the three
through holes 535, 537, 539 of the guide member 509.
[0313] Further, in between the respective flange portions 599, 601
provided at both end portions of the columnar portion 595, the
installation portions 603 of the shield plate 503 and the central
portion 527 of the guide member 509 enter into slot that the
installation portions 603 of the shield plate 503 and the central
portion 527 of the guide member 509 are caught between the flange
portions 599, 601 and the columnar portion 595 penetrates the
elongated circular through holes 535, 537, 539 of the guide
portions 523 and the circular through holes 605 of the installation
portions 603. Thereby, when the shield plate 503 moves relative to
the cap body 507 and the guide member 509, the shield plate 503 is
made to move substantially only in the longitudinal direction of
the through holes 535, 537, 539 constituting the guide portions
523.
[0314] Meanwhile, the engagement member (the member with the
flange) 597 is constituted of a first tubular member 607 comprising
a flange portion 599 at its one end portion, a second tubular
member 609 comprising a flange portion 601 at its another end
portion, a rivet 611 penetrating the tubular members 607, 609 along
these central axes and is caulked to make the respective tubular
member 607, 609 be a unitary body.
[0315] In a state where the shield plate 503 is positioned at the
housing position P501, the portions 595 of the columnar form of the
members 597 with the flanges are in contact with the uppermost end
portions of the respective elongated circular through holes 535,
537, 539. On the other hand, in a state where the shield plate 503
is positioned at the shielding position P503, the portions 595 of
the columnar form of the members 597 with the flanges are in
contact with the lowermost end portions of the respective elongated
circular through holes 535, 537, 539.
[0316] Further, in the protective cap 501, as with the protective
caps 1, 201, a retaining means 613 for retaining states in which
the shield plate 503 is positioned at the housing position P501 and
the shielding position P503 is provided. The retaining means 613
will be described in detail hereinafter.
[0317] The widths of two through holes 537, 539, which exist at
left and right sides among the three elongated circular through
holes 535, 537, 539 forming the guide portions 523, are made
constant. On the other hand, the elongated circular through hole
535 existing at the center among the three elongated circular
through holes 535, 537, 539 forming the guide portions 523 are made
slightly smaller in its width at the vicinity of the end portion of
its longitudinal direction (see FIG. 45(b)). Thereby, the shield
plate 503 is made to retain its position at either the housing
position P501 or the shielding position 2503.
[0318] Describing in more detail, as shown in FIG. 45(b), an upper
most portion 615 of the elongated circular through hole (central
through hole) 535 existing at the center of the guide members 509
is formed in an arc-like horseshoe shape. A diameter D503 of an arc
of the uppermost portion 615 formed in the arc-like horseshoe shape
is equal to or slightly larger than the outer diameter D501 of the
columnar portion 595 of the member 597 with the flange.
[0319] A distance L501 between both end portions 617 of the
uppermost portion 615 (a distance in the lateral direction in exits
of uppermost end portions of the arc-like and horseshoe shape) is
slightly smaller than the outer diameter D501 of the columnar
portion 595 of the member 597 with the flange. Then, when the
member 597 with the flange existing at the central portion in the
longitudinal direction of the elongated circular central through
hole 535 moves to the uppermost portion 615 of the elongated
circular central through hole 535, it is constituted that the
columnar portion 595 of the member 597 with the flange comes into
contact with said both end portions 617 of the uppermost end
portion 615 and a part of the guide member 509 elastically deforms
and the distance L501 between said both end portions 617 becomes
large up to the value of the outer diameter D501 of the columnar
portion 595. Further, when the member 597 with the flange is moved
so that the columnar portion 595 of the member 597 with the flange
is positioned at the uppermost portion 615, said both end portions
617 restore its original positions to retain the position of the
member 597 with the flange.
[0320] Between said both end portions 617 and separated portions
619 which are separated from said end portions 617 toward the
lowermost end side of the elongated circular through hole 535 by a
predetermined distance, the width of the elongated circular through
hole 535 is gradually reduced as going from the separated portions
619 toward said both end portions 617. More specifically, a taper
portion 621 is formed between the separated portions 619 and said
both end portions 617. Thereby it is prevented that the columnar
portion 595 of the member 597 with the flange abruptly abuts on
said both end portions 617 of the uppermost portion 615 of the
horseshoe form when the shield plate 503 moves from the shielding
position P503 to the housing position P501, and thus damage to said
both end portions 617 of the uppermost portion 615 can be
prevented.
[0321] Meanwhile the lowermost end portion side of the elongated
circular through hole 535 is also formed to comprise a taper
portion and such like as those of the uppermost portion side.
Further, to have elastic deformation of said both end portions 617
of the horseshoe shape easier, a pair of through holes (two through
holes of a circle-like form penetrating the central portion 527 of
the guide member 509 in its thickness direction) 623 are
provided.
[0322] Meanwhile, in addition to, or instead of, providing the
uppermost portion side of the elongated circular through hole 535
with the aforementioned through hole 623, it may be provided at the
lowermost end portion side of the through hole 535 of the elongated
circular shape.
[0323] Further, in addition to, or instead of, providing the
aforementioned retaining means 613 at the central elongated
circular through hole 535, it may be provided at the left and right
elongated circular through holes 537, 539.
[0324] By the way, concave portions 625 dented toward the insides
of the central portions 527 are provided at the peripheries of the
elongated circular through holes 535, 537, 539 provided at the
central portion 527 of the guide member 509. The concave portions
625 comprise predetermined widths and are provided so as to enclose
the elongated circular through holes 535, 537, 539. Further, the
installation portions 603 provided at the uppermost end portion of
the shield plate 503 as described above are provided to dent
slightly toward the inside of the shield plate 503 (see FIG. 52(b)
and FIG. 53). In the vicinities of the three concave portions 625
and at the second semi-circular-end portion curved line 531 of the
central portion 527 of the guide member 509, three projections 627
are provided. These three projections 627 project toward the front
side (outside) of the central portion 527 in the thickness
direction of the central portion 527 of the guide member 509.
[0325] In a state where the shield plate is installed the guide
member 509 by using three members 597 with the flanges provided
accordingly to the three through holes 535, 537, 539, three parts
of the uppermost end portion of the shield plate 503 are supported
by the guide member 509 via the members 597 with the flanges, the
installation portion 603 provided at the uppermost end portion of
the shield plate 503 enters into the concave portions 625 provided
at the central portion 527, and a face at the inside of the shield
plate 503 indirectly, with having a packing 631 interposed
therebetween, which will be described later in detail, abuts on the
respective projections 627 of the central portion 527.
[0326] Further, in a state where the guide member 509 provided in
the shield plate 503 is installed in the cap body 507, a small gap
629 is formed between a surface at the outside of the shield plate
503 and a semi-circular rim at a front side of the cap body 507
(see FIG. 39).
[0327] Thereby, in a regular state (a state where an uprightly
standing wearer simply wears the protective cap 501) three parts of
the uppermost end portion of the shield plate 503 are supported by
the guide member 509 via the members 597 with the flanges, the
surface at the inside of the shield plate 503 are indirectly
supported by the projection 627 of the central portion 527 with
having the packing 631 which will be described later in detail
interposed therebetween, and the shield plate 503 is supported by
the guide member 509, thereby the shield plate 503 moves in an
arc-like trajectory between the housing position P501 and the
shielding position P503.
[0328] Further, in a case where an external force in a direction
for lifting up the lowermost end of the shield plate 503 or drawing
the shield plate 503 apart from a face of a wearer is applied to
the shield plate 503 in a state where the guide member 509 in which
the shield plate 503 is installed is installed in the cap body 507,
the small gap 629 between the surface at the outside of the shield
plate 503 and the arc-like rim at the front side of the cap body
507 is gone, and then the face at the outside of the shield plate
503 indirectly, with having the packing 631 interposed
therebetween, which will be described later in detail, abuts on the
arc-like rim at the front side of the cap body 507, thereby
limiting swing of the shield plate 503 by the aforementioned
external force.
[0329] More specifically, the shield plate 503 engages with the
guide member 509 at the installation portion 603 of the uppermost
end portion thereof. Further, the shield plate 503 engages with any
of the projection 627 and the semi-arc-like rim at the front side
of the cap body 507 at a portion at the lower portion (a portion
covering a face of a wearer of the cap body 507) with being caught
between the projection 627 and the semi-arc-like rim at the front
side of the cap body 507. Then it is prevented that the shield
plate 503 shakes to a great extent.
[0330] Meanwhile, portions of the shield plate 503 other than the
aforementioned engaging portion are opposed to the guide member 509
and the cap body 507 with having a small gap therebetween.
[0331] At the three projections 627 provided at the central portion
527 of the guide member 509 and its peripheries, and at the rim of
the cap body 507 forming the gap 629 and its vicinities, the
packing (low friction member; scratch prevention member) 631 of a
plate-like form for example is adhered (see FIG. 44(a) and FIG.
46(c)). Thereby the shield plate 503 (excepting the installation
portions 603 and the visor 217) does not contact with the guide
portion 509 and the cap body 507, the shield plate 503 can move
with small frictional resistance between the housing position P501
and the shielding position 2503, and further any portions of the
shield plate 503 which come into view of a wearer of the cap body
507 (optical property range 510 regulated in the ANSI regulation as
shown in FIG. 52(a) or such) are prevented from being given
scratches.
[0332] A packing 631A provided at the central portion of the guide
member 509 is formed in a U-letter shape, and is provided from the
lowermost end toward the uppermost end of the guide member 509 to
be longer than the other packing 631. Thereby giving scratches to
the shield plate 503 is further surely prevented.
[0333] Positional relationships among respect elongated circular
through holes 535, 537, 539 provided at the central portion 527 of
the guide member 509, the concavity portions 625 formed around the
through holes 535, 537, 539, and the guide member locking portions
587 will be described in more detail hereinafter.
[0334] The guide member locking portions 587 are as described above
provided by four as shown in FIG. 43(b)). The guide member locking
portion 587A positioned at the leftmost side is positioned
substantially at the center between the central portion engagement
portion 561A at the left side and the through hole 537 at the left
in an extending direction of the second semi-circular-end portion
curved line 531, and the guide member locking portion 587B
positioned at the next to the leftmost side is positioned adjacent
to the concave portion 625 of the through hole 537 at the left side
and between the through hole 537 at the left and the central
through hole 535 in the extending direction of the second
semi-circular-end portion curved line 531. Further the two guide
member locking portions 587C, 587D at the right side are provided
symmetrically to the guide member locking portions 587A, 5878 at
the right side relative to a plane extending in the upper-and-lower
and front-and-rear directions through the center of the guide
member 509.
[0335] As the guide member locking portions 587 are provided at
these positions, the hammock 517 can be installed at any proper
position of the guide member 509 with avoiding interference by the
guide member locking portions 587 and the guide portions 523 of the
guide member 509, and is, with the hammock 517, capable of properly
receiving an external force applied to the cap body 507.
[0336] Further, by engaging to-be-locked portions 633 of an
ear-strap (chin-strap) 515 with the locking portion 585A provided
at the leftmost side among the cap body locking portions 585 (see
FIG. 46(c)) and the locking portion 587A provided at the leftmost
side among the guide member locking portions 587 (see FIG. 43(b)),
and further by engaging the other ear-strap (chin-strap) 515 with
the locking portion 585D provided at the rightmost side among the
cap body locking portions 585 or the locking portion 5850 next
thereto (see FIG. 46(c)) and the locking portion 587D provided at
the rightmost side among the guide member locking portions 587 (see
FIG. 43(b)), the respective chin-straps 515 can be installed at any
proper positions of the cap body 507 or the guide member 509, and
then a wearer of the protective cap 501 can wear the protective cap
501 without feeling wrong and can fix the protective cap 501 with
his or her head by using the respective chin-straps 515.
[0337] Meanwhile, as being understood already, as the cap body
locking portions 585 are provided at the rear side of the cap body
507 and the guide member 509 is provided at the front side of the
cap body 507, the cap body locking portion 585 is positioned at the
rear side relative to the guide member locking portions 587.
[0338] After engaging the to-be-locked portions 633 of the
chin-strap 515 with the cap body locking portions 585 or the guide
member locking portions 587, by engaging the to-be-locked portions
589 of the hammock 517 with the cap body locking portions 585 or
the guide member locking portion 587, the chin-strap 515 (the
to-be-locked portions 633) and the hammock 517 (the to-be-locked
portions 589) are made to be installed integrally with the cap body
507 and the guide member 509. Meanwhile the hammock 517 is made to
be easily detachably attached to the cap body 507 and the guide
member 509 and then it is made that the once installed hammock 517
is not easily detached from the cap body 507 and the guide member
509.
[0339] Further, in the protective cap 501, the respective side
portions 541, 543 of the guide member 509 and the to-be-engaged
portions 633 of the chin-strap 515 are caught between the cap body
507 and the to-be-engaged portions 589 of the hammock 517 and then
installed integrally with the cap body 507 (see FIG. 42(b).
[0340] According to the protective cap 501, as the guide member 509
comprises the central portion 527 formed in the plate-like shape
comprising the curved surface of the sphere-like shape and the
guide portion 523 is formed at the central portion (close to the
center of the central portion 527 in the lateral direction, for
example) 527, a so-called narrow guide is formed and getting the
shield plate 503 in and out (movement between the housing position
P501 and the shielding position P503) can be carried out smoothly
as compared with a case where the guide portion 523 is provided at
sides of the sides (at the sides of respective end portions in the
lateral direction) of the central portion 527.
[0341] Further, according to the protective cap 501, as the guide
member 509 is constituted to comprise the central portion 527 of
the guide member 509 and the side portions 541, 543, the pair of
central portion engagement portions 561 (561A, 561B) formed in the
vicinity of the respective side portions 541, 543 and at the
central portion 527 engage with the pair of central portion
to-be-engaged portions 563 provided in the cap body 507, and the
side portion engagement portions 565, 569 formed at the respective
side portions 541, 543 engage with the side portion to-be-engaged
portions 567, 571, the degree of how the guide member 509 shakes
relative to cap body 507 can be reduced.
[0342] More specifically, in a case where one gets the shield plate
503 in and out, as the guide member 509 guides the shield plate
503, while a rotation moment about the axis C501 extending in the
lateral direction of the cap body 507 is applied to the guide
member 509 and this rotation moment is transmitted through the
guide member 509 to the cap body 507, the central portion
engagement portions 561 of the guide member 509 engaging with the
central portion to-be-engaged portions 563 of the cap body 507
function as pivots and the side portion engagement portions 565,
569 of the guide member 509 engaging with the side portion
to-be-engaged portion 567, 571 of the cap body 507 receive the
rotation moment, thereby reducing the degree of shaking as
described above.
[0343] Further, as the side portion engagement portions 565, 569 of
the guide member 509 are provided at two sites at the left and two
sites at the right, the degree of shaking can be further reduced.
Further, the side portion engagement portion (through hole 581) at
the rear side among the two side portion engagement portions 565 at
the left side and the side portion engagement portion (through hole
581) at the rear side among the two side portion engagement
portions 565 at the right side are positioned in the vicinity of
the rearmost end portion of the cap body 507, the distance between
the central portion engagement portions 561 to be the pivots and
the side portion engagement portions 565 at the rear side is made
greater, thereby further reducing the degree of shaking.
[0344] Further, according to the protective cap 501, as the guide
portions 523 of the guide member 509 are constituted of the three
elongated circular through holes 535, 537, 539, the columnar
portions 595 respectively engage with the three through holes 535,
537, 539 to guide the shield plate 503 to move between the housing
position P501 and the shielding position P503, the shield plate 503
is allowed to smoothly move relative to the guide member 509
although the configuration is simple, as well as a degree of
shaking the shield plate 503 is reduced.
[0345] Meanwhile, as the shield plate 503, that of a half type
covering only an upper half of a face of a wearer can be used.
Further, the shield plate 503 may be formed in a similar way to the
shield plate in accordance with the first embodiment. More
specifically, as shown in FIG. 15 and FIG. 16 for example, it may
be formed in a shape in which a thickness is gradually reduced as
going from a central portion to a periphery portion.
* * * * *