U.S. patent application number 09/967960 was filed with the patent office on 2002-04-18 for electric vacuum cleaner and nozzle unit therefor.
This patent application is currently assigned to Sharp Kabushiki Kaisha. Invention is credited to Hato, Shigenori, Hikida, Nobuharu, Inoue, Teruhisa, Kosaka, Genji, Nagai, Kiyomu, Ohta, Kei, Shindou, Masaru, Tamura, Taichi, Yagi, Mikio.
Application Number | 20020042969 09/967960 |
Document ID | / |
Family ID | 27521200 |
Filed Date | 2002-04-18 |
United States Patent
Application |
20020042969 |
Kind Code |
A1 |
Nagai, Kiyomu ; et
al. |
April 18, 2002 |
Electric vacuum cleaner and nozzle unit therefor
Abstract
A nozzle unit for an electric vacuum cleaner has a body case 32
with a nozzle 34a open toward a surface to be cleaned, a first pipe
35 coupled to the body case 32 so as to be rotatable in the
direction J1, and a second pipe 36 coupled to the first pipe 35 so
as to be rotatable in the direction J2. A first and a second air
flow passage, formed inside the first and second pipes 35 and 36
respectively, are arranged substantially in a straight line as seen
in a side view. The first pipe 35 has a sliding portion 35a that
has an arc-shaped cross section and that slides along the inner
surface of the body case 32, and this sliding portion 35a is
arranged inside the body case 32, which is substantially
rectangular, as seen in a plan view.
Inventors: |
Nagai, Kiyomu;
(Kitakatsuragi-Gun, JP) ; Kosaka, Genji;
(Ikoma-Gun, JP) ; Hikida, Nobuharu; (Nara-Shi,
JP) ; Yagi, Mikio; (Osaka-Shi, JP) ; Hato,
Shigenori; (Kishiwada-Shi, JP) ; Tamura, Taichi;
(Higashiosaka-Shi, JP) ; Inoue, Teruhisa;
(Osaka-Shi, JP) ; Ohta, Kei; (Yao-Shi, JP)
; Shindou, Masaru; (Yao-Shi, JP) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
Sharp Kabushiki Kaisha
Osaka
JP
|
Family ID: |
27521200 |
Appl. No.: |
09/967960 |
Filed: |
October 2, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09967960 |
Oct 2, 2001 |
|
|
|
09357818 |
Jul 20, 1999 |
|
|
|
Current U.S.
Class: |
15/410 ;
15/334 |
Current CPC
Class: |
A47L 9/0416 20130101;
A47L 9/244 20130101; A47L 9/02 20130101; A47L 9/242 20130101; A47L
9/327 20130101; A47L 9/0483 20130101 |
Class at
Publication: |
15/410 ;
15/334 |
International
Class: |
A47L 009/32 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 29, 1998 |
JP |
H10-213975 |
Feb 8, 1999 |
JP |
H11-030148 |
Jul 28, 1998 |
JP |
H10-212676 |
Oct 29, 1998 |
JP |
H10-308704 |
Nov 30, 1998 |
JP |
H10-338617 |
Claims
What is claimed is:
1. An electric vacuum cleaner comprising: a nozzle unit kept in
contact with a surface to be cleaned for dust suction; an extension
pipe coupled to the nozzle unit; a hose coupling the extension pipe
to a body of the electric vacuum cleaner; and a handle provided at
an end of the extension pipe so as to be held by a user during
cleaning, the handle being so formed that an angle of at least a
portion thereof is variable relative to the extension pipe.
2. An electric vacuum cleaner as claimed in claim 1, further
comprising: a coupling member arranged between the extension pipe
and the hose, wherein the handle is formed in a shape of a hollow
cylinder so as to be rotatably fitted on the coupling member, and
wherein, when the extension pipe is removed from the coupling
member, the handle rotates to a portion of the coupling member at
which the extension pipe has been coupled to the coupling member so
as to communicate with the hose.
3. An electric vacuum cleaner as claimed in claim 2, wherein, in a
manner interlocked with rotation of the handle, a tip of an
auxiliary nozzle provided inside the handle comes out of an end of
the handle.
4. An electric vacuum cleaner as claimed in claim 2, wherein, when
the handle communicates with the hose, a tip of an auxiliary nozzle
provided inside the handle is made to come out of an end of the
handle by a suction force originating from the body of the electric
vacuum cleaner.
5. An electric vacuum cleaner as claimed in claim 2, further
comprising: a lock mechanism for locking the handle in a
predetermined rotation position.
6. An electric vacuum cleaner as claimed in claim 5, further
comprising: an unlocking switch provided on the handle for
unlocking the lock mechanism.
7. An electric vacuum cleaner as claimed in claim 6, wherein, when
the lock mechanism is unlocked, the handle is moved to a
predetermined position by weight of the extension pipe itself.
8. An electric vacuum cleaner as claimed in claim 2, wherein, when
the handle is rotated to a predetermined rotation position, the
extension pipe and the hose, or the handle and the hose, are
arranged in a straight line.
9. An electric vacuum cleaner as claimed in claim 1, further
comprising: a coupling member arranged between the extension pipe
and the hose, the coupling member having: a rotatable portion for
rotating the handle and the hose together relative to the extension
pipe; and a flexible hose-like member for coupling the rotatable
portion to a portion of the coupling member at which the extension
pipe is coupled to the coupling member.
10. An electric vacuum cleaner as claimed in claim 1, wherein the
handle is divided into two parts that are arranged along an axis of
the handle and are coupled by a coupling portion having a rotation
axis substantially perpendicular to the axis of the handle so that
the handle can be bent by rotating one of the two parts of the
handle about the rotation axis.
11. An electric vacuum cleaner as claimed in claim 1, wherein the
handle is divided into two parts that are kept in contact with each
other with a contact interface therebetween inclined relative to an
axis of the handle so that the handle can be bent by rotating one
of the two parts of the handle about an axis perpendicular to the
contact interface.
12. An electric vacuum cleaner comprising: a nozzle unit kept in
contact with a surface to be cleaned for dust suction; an extension
pipe coupled to the nozzle unit; a hose coupling the extension pipe
to a body of the electric vacuum cleaner; a coupling member
arranged between the extension pipe and the hose; a handle provided
on the coupling member so as to be held by a user during cleaning,
the handle being formed in a shape of a hollow cylinder; and an
auxiliary nozzle slidable inside the handle, the auxiliary nozzle,
when the extension pipe is removed from the coupling member, being
moved out at a portion of the coupling member at which the
extension pipe has been coupled to the coupling member so as to
protrude from the coupling member and communicate with the
hose.
13. An electric vacuum cleaner comprising: a nozzle unit kept in
contact with a surface to be cleaned for dust suction; an extension
pipe coupled to the nozzle unit; a hose coupling the extension pipe
to a body of the electric vacuum cleaner; and a handle provided at
an end of the extension pipe so as to be held by a user during
cleaning, the handle being coupled to the extension pipe so as to
be rotatable coaxially with the extension pipe.
14. An electric vacuum cleaner as claimed in claim 13, wherein the
handle can be locked at least at one rotation position relative to
the extension pipe.
15. An electric vacuum cleaner as claimed in claim 13, wherein a
range of rotation of the handle relative to the extension pipe is
restricted.
16. An electric vacuum cleaner as claimed in claim 13, further
comprising: a first groove provided circumferentially on one of the
extension pipe and the handle; second grooves provided at a
plurality of positions around a same circumference on said one of
the extension pipe and the handle; a first engagement member
provided on the other of the extension pipe and the handle, the
first engagement member engaging with the first groove so as to
couple the extension pipe and the handle together rotatably; and a
second engagement member provided on said other of the extension
pipe and the handle, the second engagement member engaging with one
of the second grooves so as to stop rotation of the extension
pipe.
17. An electric vacuum cleaner as claimed in claim 16, further
comprising: a stopper portion provided in the first groove or in
the second grooves, the stopper portion striking the first or
second engagement member so as to restrict a range of rotation of
the extension pipe relative to the handle.
18. An electric vacuum cleaner as claimed in claim 16, wherein the
first and second engagement members are formed as a single
member.
19. An electric vacuum cleaner as claimed in claim 18, further
comprising: a disengaging member loaded with a force that tends to
move it in a predetermined direction and interlocked with the first
and second engagement members, the disengaging member, when
subjected to a load against the force with which it is loaded,
disengaging said one of the second grooves from the second
engagement member and, when subjected to a heavier load,
disengaging the first groove from the first engagement member.
20. An electric vacuum cleaner as claimed in claim 16, wherein the
second engagement member is loaded with a force that causes it to
press said one of the second grooves, and the second grooves have
inclined surfaces as axial end surfaces.
21. An electric vacuum cleaner as claimed in claim 16, wherein the
second grooves are formed in a bottom portion of the first groove,
and the first engagement member is shared as the second engagement
member.
22. An electric vacuum cleaner as claimed in claim 16, wherein said
one of the second grooves is disengaged from the second engagement
member by rotation of the extension pipe relative to the
handle.
23. A nozzle unit for an electric vacuum cleaner, comprising: a
body case having a nozzle open toward a surface to be cleaned, the
body case having a substantially rectangular shape as seen in a
plan view; a first pipe that has a first air flow passage for
allowing passage of a flow of air sucked in through the nozzle and
that is coupled to the body case so as to be rotatable about a
rotation axis parallel to a direction of longer sides of the
nozzle, the first pipe having a sliding portion that slides along
the body case as the first pipe rotates, the sliding portion
arranged inside the body case as seen in a plan view; and a second
pipe rotatably coupled to the first pipe, the second pipe having a
second air flow passage that communicates with the first air
passage.
24. A nozzle unit for an electric vacuum cleaner as claimed in
claim 23, wherein the first and second air flow passages are
arranged substantially along a straight line as seen in a side
view, and the second pipe is rotatable about a rotation axis
substantially perpendicular to the first air flow passage.
25. A nozzle unit for an electric vacuum cleaner as claimed in
claim 24, wherein the first air flow passage is rotatable between a
substantially horizontal position and a substantially vertical
position relative to the surface to be cleaned.
26. A nozzle unit for an electric vacuum cleaner as claimed in
claim 25, wherein the rotation axis of the second pipe lies
substantially at a center of the body case in a direction of longer
sides of the body case, and a width of the first and second pipes
in a direction of shorter sides of the body case is smaller than a
width of the body case in the same direction as seen in a plan view
when the first pipe is held perpendicularly to the surface to be
cleaned.
27. A nozzle unit for an electric vacuum cleaner as claimed in
claim 25, wherein rotation of the second pipe is restricted when
the first air flow passage is substantially parallel to the surface
to be cleaned.
28. A nozzle unit for an electric vacuum cleaner as claimed in
claim 25, wherein the first air flow passage has a maximum
cross-sectional area when its angle relative to the surface to be
cleaned is in a predetermined range.
29. A nozzle unit for an electric vacuum cleaner as claimed in
claim 28, further comprising: an engagement member having an
arc-shaped cross section and engaged with the first pipe so as to
be interlocked therewith in accordance with a rotation angle of the
first pipe; and an opening provided in the body case so as to allow
rotation of the first pipe, the opening being closed by the sliding
portion, which has an arc-shaped cross section and which slides
along an inner surface of the body case, and by the engagement
member.
30. A nozzle unit for an electric vacuum cleaner as claimed in
claim 29, further comprising: a locking member having an arc-shaped
cross section and engaged with the engagement member in accordance
with a rotation angle of the first pipe, the locking member being
arranged inside the engagement member.
31. A nozzle unit for an electric vacuum cleaner as claimed in
claim 30, further comprising: a covering portion provided at a
front end of the engagement member so as to close a gap between the
engagement member and the body case.
32. A nozzle unit for an electric vacuum cleaner as claimed in
claim 23, further comprising: casters provided on a bottom surface
of the body case so as to roll on the surface to be cleaned, the
casters being rotatable about an axis perpendicular to the surface
to be cleaned.
33. A nozzle unit for an electric vacuum cleaner as claimed in
claim 32, wherein the casters can be moved translationally along
the surface to be cleaned.
34. A nozzle unit for an electric vacuum cleaner as claimed in
claim 32, wherein the casters are arranged inside the body case as
seen in a plan view.
35. A nozzle unit for an electric vacuum cleaner as claimed in
claim 32, further comprising: recessed portions provided in the
bottom surface of the body case so as to have openings in
circumferential surfaces of the body case, the recessed portions
being used to arrange the casters.
36. A nozzle unit for an electric vacuum cleaner as claimed in
claim 32, further comprising: supporting members, provided one pair
for each of the casters, for supporting shafts of the casters on
both sides of the casters; and reinforcing members for bridging
between each pair of supporting members in front of and behind the
casters.
37. A nozzle unit for an electric vacuum cleaner as claimed in
claim 23, wherein the first pipe has an opening provided to allow
rotation of the second pipe, and has a movable shutter for closing
the opening.
38. A nozzle unit for an electric vacuum cleaner as claimed in
claim 37, wherein the shutter is interlocked with the second
pipe.
39. A nozzle unit for an electric vacuum cleaner as claimed in
claim 37, further comprising: a restricting member for restricting
rotation of the second pipe relative to the first pipe.
40. A nozzle unit for an electric vacuum cleaner as claimed in
claim 39, wherein the restricting member has a force-loading member
and a ball.
41. A nozzle unit for an electric vacuum cleaner as claimed in
claim 39, wherein the restricting member has a dust-proof member
for preventing entry of dust.
42. A nozzle unit for an electric vacuum cleaner as claimed in
claim 23, further comprising: a rotary brush rotatably arranged
inside the body case, the rotary brush having a hollow shaft and
blades provided so as to protrude from the shaft, the blades each
having a plurality of through holes that communicate with an inside
of the shaft.
43. A nozzle unit for an electric vacuum cleaner as claimed in
claim 42, further comprising: an attachment/detachment button
supported on the body case through a shaft so as to be rotated to
press and thereby support an end of the rotary brush; and a rib
provided on the body case so as to restrict rotation of the
attachment/detachment button, wherein a certain amount of play is
secured to allow free movement of the shaft of the
attachment/detachment button.
44. A nozzle unit for an electric vacuum cleaner, comprising: a
body case having a nozzle open toward a surface to be cleaned; a
suction pipe rotatably coupled to the body case so as to allow
passage of a flow of air sucked in through the nozzle, the suction
pipe having a sliding portion that has an arc-shaped cross section
and that slides along an inner surface of the body case; and a
rotary brush rotatably arranged inside the sliding portion.
45. A nozzle unit for an electric vacuum cleaner as claimed in
claim 44, further comprising: an air inlet provided on the body
case, the air inlet allowing air to be sucked in to rotate the
rotary brush; an engagement member that has an arc-shaped cross
section and that is engaged with the suction pipe so as to be
interlocked therewith in accordance with a rotation angle of the
suction pipe, the engagement member having a hole that communicates
with the air inlet; and an opening provided in the body case so as
to allow rotation of the suction pipe, the opening being closed by
the sliding portion, which has an arc-shaped cross section and
which slides along the inner surface of the body case, and by the
engagement member.
46. A nozzle unit for an electric vacuum cleaner, comprising: a
nozzle open toward a surface to be cleaned; a sealing member
rotatably provided in a front portion of the nozzle unit so as to
open or close a front portion of the nozzle according as the nozzle
unit is moved back and forth, the sealing member having a plurality
of projections on a surface thereof facing the nozzle.
47. A nozzle unit for an electric vacuum cleaner as claimed in
claim 46, wherein the projections are formed integrally with the
sealing member so as to have a substantially conical shape
each.
48. A nozzle unit for an electric vacuum cleaner as claimed in
claim 46, wherein the projections are arranged in a plurality of
rows of projections extending along a direction of longer sides of
the sealing member, with the projections in any two adjacent rows
located at different positions in the direction of the longer sides
of the sealing member.
49. A nozzle unit for an electric vacuum cleaner as claimed in
claim 46, wherein at least part of the projections are arranged
near a bottom end of the sealing member.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an electric vacuum cleaner
and to a nozzle unit for an electric vacuum cleaner.
[0003] 2. Description of the Prior Art
[0004] A conventional electric vacuum cleaner has a structure as
shown in FIG. 48. A nozzle unit 8 having a nozzle (not shown)
formed in its bottom surface is coupled to an extension pipe 6. The
extension pipe 6 is coupled through a coupling member 2 to a
flexible hose 3. The hose is coupled to the body 9 of the electric
vacuum cleaner. The flow of air sucked in through the nozzle flows
through the extension pipe 6, the coupling member 2, and the hose
3, and then reaches the body 9 of the electric vacuum cleaner,
thereby achieving suction of dust.
[0005] The coupling member 2 has a handle 1 formed integrally
therewith, which is held by the user during cleaning. The coupling
member 2 also has an operation switch 10, which is used during
cleaning to control a rotary brush (not shown) provided in the
nozzle unit 8 and to control the body 9 of the electric vacuum
cleaner.
[0006] The nozzle unit 8 is shown in more detail in FIG. 49. The
nozzle unit 8 has a body case 32, of which a coupling portion 32a
supports a first pipe 35 in such a way that the first pipe 35 is
rotatable in the direction indicated by the arrow J1. The first
pipe 35 supports a second pipe 36 in such a way that the second
pipe 36 is rotatable in the direction indicated by the arrow J2.
The above-mentioned extension pipe 6 is coupled to this second pipe
36.
[0007] Thus, the first pipe 35 allows the elevation (depression)
angle of the extension pipe 6 to vary when the nozzle unit 8 is
moved in the direction indicated by the arrow G. For example, the
first pipe 35 is rotated in the direction J1 so that the extension
pipe 6 becomes substantially upright, and then the second pipe 36
is rotated in the direction J2. Thus, the second pipe 36 allows the
elevation (depression) angle of the extension pipe 6 to vary when
the nozzle unit 8 is moved in the direction indicated by the arrow
H.
[0008] On the two side surfaces of the coupling portion 32a of the
body case 32, casters 39 are provided that roll on the floor so as
to allow the nozzle unit 8 to move. The air sucked in in the
direction indicated by the arrow F1 through the nozzle (not shown)
formed in the bottom surface of the body case 32 flows in the
direction indicated by the arrow F2 toward the coupling portion
32a. The air then flows through the first and second pipes 35 and
36 as indicated by the arrows F3, F4, and F5, then flows through
the extension pipe 6, and then reaches the electric vacuum cleaner
body 9.
[0009] In ordinary cleaning, as shown in FIG. 50, the first and
second pipes 35 and 36 are kept in a straight line as seen from
above, and cleaning is performed as the nozzle unit 8 is moved in
the direction indicated by the arrow G. In cleaning of a narrow
area such as a gap between pieces of furniture, as shown in FIG.
51, the second pipe 36 is rotated, and dust suction is performed as
the nozzle unit 8 is moved in the direction indicated by the arrow
H.
[0010] In an electric vacuum cleaner of this type, the handle 1 is
fixed to the coupling member 2 so as to be integral therewith.
Therefore, in cleaning of an area such as a gap below a bed, the
user needs to take a low position to hold the handle 1 while moving
the nozzle unit 8. This imposes an undue burden on the user, and is
thus undesirable in terms of user-friendliness.
[0011] In some cases, to perform dust suction in a narrow area, an
auxiliary nozzle is used, such as a crevice nozzle having a flat
tip or a dusting brush having a brush at its tip. In such cases,
first, the extension pipe 6 needs to be removed from the coupling
member 2. Then, an auxiliary nozzle (not shown) stored inside the
electric vacuum cleaner body 9 needs to be taken out and coupled to
the coupling member 2 so as to be ready for use. This requires
complicated handling, and is thus undesirable in terms of
user-friendliness. There is also a possibility of loss of an
auxiliary nozzle.
[0012] Handling of an auxiliary nozzle can be simplified if the
auxiliary nozzle is removably held on the extension pipe 6.
However, this requires the auxiliary nozzle to be kept visible with
dust and the like clung to the tip thereof, and thus spoils the
appearance. There is also a possibility of loss of an auxiliary
nozzle as in the cases described previously.
[0013] Moreover, from the nozzle unit 8, the coupling portion 32a
and the first and second pipes 35 and 36 protrude in the direction
(indicated by G) of the depth of the nozzle unit 8. (Note here that
a depth means the length of the shorter sides of something
perpendicular as seen in a plan view.) Thus, the nozzle unit 8 has
an unduly large depth W1 relative to the depth W2 of the nozzle 32b
(see FIG. 51). This makes cleaning of a gap difficult, and also, by
requiring the nozzle unit 8 to be made larger and thus heavier,
imposes an undue burden on the user.
[0014] Moreover, the air passage is bent in the first pipe 35 and
also in the second pipe 36, and thus the suction pressure suffers a
great loss. This reduces suction efficiency and increases noise.
Furthermore, the range of rotation of the first pipe 35 in the
direction J1 is so narrow that the elevation (depression) angle of
the extension pipe 6 can be varied only between approximately 30
and 70.degree.. This makes it difficult to move the nozzle unit 8
so as to reach sufficiently deep into an area such as below a bed
where there is only a small gap above the floor, and is thus
undesirable in terms of user-friendliness.
SUMMARY OF THE INVENTION
[0015] An object of the present invention is to provide an electric
vacuum cleaner and a nozzle unit for an electric vacuum cleaner
that offer improved user-friendliness in cleaning performed with
the user taking a low position and in cleaning performed using an
auxiliary nozzle. Another object of the present invention is to
provide a compact and light-weight nozzle unit for an electric
vacuum cleaner that offers improved suction efficiency.
[0016] To achieve the above objects, according to one aspect of the
present invention, an electric vacuum cleaner is provided with:
[0017] a nozzle unit kept in contact with a surface to be cleaned
for dust suction;
[0018] an extension pipe coupled to the nozzle unit;
[0019] a hose coupling the extension pipe to the body of the
electric vacuum cleaner; and
[0020] a handle provided at an end of the extension pipe so as to
be held by a user during cleaning, the handle being so formed that
the angle of at least a portion thereof is variable relative to the
extension pipe.
[0021] According to this arrangement, it is possible to change the
angle of the handle provided at one end of the extension pipe
coupled to the nozzle unit to a desired angle in accordance with
the situation in which cleaning is performed, so that the user can
hold the handle at the desired angle when moving the nozzle unit
back and forth to do the cleaning.
[0022] According to another aspect of the present invention, a
nozzle unit for an electric vacuum cleaner is provided with:
[0023] a body case having a nozzle open toward a surface to be
cleaned, the body case having a substantially rectangular shape as
seen in a plan view:
[0024] a first pipe that has a first air flow passage for allowing
passage of a flow of air sucked in through the nozzle and that is
coupled to the body case so as to be rotatable about a rotation
axis parallel to the direction of the longer sides of the nozzle,
the first pipe having a sliding portion that slides along the body
case as the first pipe rotates, the sliding portion arranged inside
the body case as seen in a plan view; and
[0025] a second pipe rotatably coupled to the first pipe, the
second pipe having a second air flow passage that communicates with
the first air passage.
[0026] According to this arrangement, the sliding portion of the
first pipe is arranged inside the substantially rectangular body
case as seen in a plan view so as to be slidable along the body
case, and thus the first pipe can be inclined in the direction of
the depth (i.e. in the direction of the shorter sides) of the
nozzle unit. The air sucked in through the nozzle achieves dust
suction by flowing through the first air flow passage inside the
first pipe and then through the second air flow passage inside the
second pipe, of which the latter can be inclined in the direction
of the longer sides of the body case. By rotating the first and
second pipes appropriately, it is possible to reduce the
depth-direction width of the nozzle unit.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] This and other objects and features of the present invention
will become clear from the following description, taken in
conjunction with the preferred embodiments with reference to the
accompanying drawings in which:
[0028] FIG. 1 is a perspective view of the handle of the electric
vacuum cleaner of a first embodiment of the invention;
[0029] FIG. 2 is a sectional view, as seen from the side, of the
handle of the electric vacuum cleaner of the first embodiment;
[0030] FIG. 3 is a diagram showing the state of the handle of the
electric vacuum cleaner of the first embodiment when it is in the
reversed position;
[0031] FIG. 4 is a diagram showing the state of the handle of the
electric vacuum cleaner of the first embodiment when it is in the
upright position;
[0032] FIG. 5 is a side view of the handle of the electric vacuum
cleaner of the first embodiment, illustrating its lock
mechanism;
[0033] FIG. 6 is a diagram showing the state of the handle of the
electric vacuum cleaner of the first embodiment when the lock
mechanism is unlocked;
[0034] FIGS. 7A and 7B are side views of the handle of the electric
vacuum cleaner of a second embodiment;
[0035] FIGS. 8A, 8B, and 8C are sectional views, as seen from the
side, of the handle of the electric vacuum cleaner of a third
embodiment;
[0036] FIGS. 9A and 9B are sectional views, as seen from the side,
of the handle of the electric vacuum cleaner of a fourth
embodiment;
[0037] FIG. 10 is a side view of the handle of the electric vacuum
cleaner of a fifth embodiment;
[0038] FIG. 11 is a side view of the handle of the electric vacuum
cleaner of a sixth embodiment;
[0039] FIGS. 12A and 12B are sectional views, as seen from the
side, of the handle of the electric vacuum cleaner of a seventh
embodiment;
[0040] FIG. 13 is a schematic overall view of the electric vacuum
cleaner of an eighth embodiment;
[0041] FIG. 14 is a schematic perspective view of the nozzle unit
of the electric vacuum cleaner of the eighth embodiment;
[0042] FIG. 15 is a bottom view of the nozzle unit of the electric
vacuum cleaner of the eighth embodiment;
[0043] FIG. 16 is a sectional view, as seen from the front, of the
nozzle unit of the electric vacuum cleaner of the eighth
embodiment;
[0044] FIG. 17 is a schematic perspective view showing the state of
the nozzle unit of the electric vacuum cleaner of the eighth
embodiment when it is ready for cleaning in another direction;
[0045] FIG. 18 is a side view of the nozzle unit of the electric
vacuum cleaner of the eighth embodiment;
[0046] FIG. 19 is a top view of the nozzle unit of the electric
vacuum cleaner of the eighth embodiment;
[0047] FIG. 20 is a sectional view, as seen from the side, of the
nozzle unit of the electric vacuum cleaner of the eighth
embodiment;
[0048] FIG. 21 is an exploded perspective view showing an example
of the structure of the rotation mechanism of the nozzle unit of
the electric vacuum cleaner of the eighth embodiment;
[0049] FIG. 22 is a sectional view, as seen from the side, of the
nozzle unit of the electric vacuum cleaner of the eighth
embodiment, showing a state of rotation of the first pipe;
[0050] FIG. 23 is a sectional view, as seen from the side, of the
nozzle unit of the electric vacuum cleaner of the eighth
embodiment, showing another state of rotation of the first
pipe;
[0051] FIG. 24 is an exploded perspective view showing another
example of the structure of the rotation mechanism of the nozzle
unit of the electric vacuum cleaner of the eighth embodiment;
[0052] FIG. 25 is an exploded perspective view showing an example
of the structure of a caster portion of the nozzle unit of the
electric vacuum cleaner of the eighth embodiment;
[0053] FIG. 26 is an exploded perspective view showing another
example of the structure of a caster portion of the nozzle unit of
the electric vacuum cleaner of the eighth embodiment;
[0054] FIG. 27 is a schematic view showing the state of the
electric vacuum cleaner of the eighth embodiment when the nozzle
unit is in the longitudinal position;
[0055] FIG. 28 is a schematic view showing the state of the
electric vacuum cleaner of the eighth embodiment when the nozzle
unit is in the longitudinal position and the extension pipe is
rotated;
[0056] FIG. 29 is a sectional view of the coupling portion of the
electric vacuum cleaner of the eighth embodiment;
[0057] FIG. 30 is a partial sectional view of the coupling portion
of the electric vacuum cleaner of the eighth embodiment;
[0058] FIG. 31 is a sectional view showing the state of the
coupling portion of the electric vacuum cleaner of the eighth
embodiment when the second projection is disengaged;
[0059] FIG. 32 is a sectional view, as seen from the front, of the
locking groove of the extension pipe of the electric vacuum cleaner
of the eighth embodiment;
[0060] FIG. 33 is an enlarged partial view of FIG. 32;
[0061] FIG. 34 is a sectional view, as seen from the front of the
coupling groove of the extension pipe of the electric vacuum
cleaner of the eighth embodiment;
[0062] FIG. 35 is a sectional view showing the state of the
coupling portion of the electric vacuum cleaner of the eighth
embodiment when the first projection is disengaged;
[0063] FIG. 36 is a sectional view of another example of the
structure of the coupling portion of the electric vacuum cleaner of
the eighth embodiment:
[0064] FIG. 37 is a partial sectional view of FIG. 36;
[0065] FIG. 38 is a sectional view showing the state when the
extension pipe is removed from the state shown in FIG. 36;
[0066] FIG. 39 is a sectional view, as seen from the side, of the
nozzle unit of the electric vacuum cleaner of a ninth
embodiment;
[0067] FIG. 40 is a front view showing the state of the nozzle unit
of the electric vacuum cleaner of the ninth embodiment when the
second pipe is in the upright position;
[0068] FIG. 41 is a front view showing the state of the nozzle unit
of the electric vacuum cleaner of the ninth embodiment when the
second pipe is in the fully inclined position;
[0069] FIG. 42 is a detail view of the principal portion of the
click mechanism of the nozzle unit of the electric vacuum cleaner
of the ninth embodiment;
[0070] FIG. 43 is a sectional view, as seen from the front, of the
nozzle unit of the electric vacuum cleaner of the ninth
embodiment;
[0071] FIG. 44 is a sectional view, as seen from the side, of the
nozzle unit of the electric vacuum cleaner of a tenth
embodiment;
[0072] FIG. 45 is a bottom view of the nozzle unit of the electric
vacuum cleaner of the tenth embodiment;
[0073] FIG. 46 is an exploded perspective view of the flexible
member of the nozzle unit of the electric vacuum cleaner of the
tenth embodiment;
[0074] FIG. 47 is a detail view of the principal portion of the
front portion of the nozzle unit of the electric vacuum cleaner of
the tenth embodiment;
[0075] FIG. 48 is a perspective view of a conventional electric
vacuum cleaner;
[0076] FIG. 49 is a schematic perspective view of the nozzle unit
of a conventional electric vacuum cleaner;
[0077] FIG. 50 is a schematic top view showing the state of the
nozzle unit of a conventional electric vacuum cleaner when it is in
the lateral position; and
[0078] FIG. 51 is a schematic top view showing the state of the
nozzle unit of a conventional electric vacuum cleaner when it is in
the longitudinal position.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0079] Hereinafter, embodiments of the present invention will be
described with reference to the drawings. FIGS. 1 and 2 are a
perspective view and a sectional view of the principal portion of
the handle of the electric vacuum cleaner of a first embodiment of
the invention. The electric vacuum cleaner as a whole has the same
structure as the conventional example shown in FIG. 48. In a
coupling member 2, an extension pipe connection aperture 2a is
provided into which an extension pipe 6 is inserted. Inside the
coupling member 2, the extension pipe connection aperture 2a
communicates with a hose 3 that is inserted through an opening
2d.
[0080] To the coupling member 2, a handle 1 is fitted through a
mount 1b (having a U-like shape as seen in a plan view) in such a
way that the mount 1b sandwiches the coupling member 2 from the two
side surfaces thereof. The mount 1b is rotatably supported on the
coupling member 2 through a supporting shaft 21. The handle 1 has
the shape of a hollow cylinder and is open at its free-end surface
1a. Moreover, the handle 1 has an inner barrel 18 slidably provided
inside it.
[0081] Within a cavity 1r formed in a double-cylinder portion 1e
formed inside the handle 1, the inner barrel 18 is loaded with a
force that tends to move it toward the coupling member 2 by a
compression spring 19. The inner barrel 18 reaches into the opening
2d of the coupling member 2, and thus a stopper portion 2e of the
coupling member 2 restricts rotation of the handle 1 in the
direction indicated by the arrow A. On the other hand, a base plate
2c strikes the mount 1b and thereby restricts rotation of the
handle 1 in the direction indicated by the arrow B. In this way,
the handle 1 is locked.
[0082] The state shown in FIG. 2 is the standard position of the
handle (hereafter the "standard position") that allows a standing
user to hold the handle 1 and move the nozzle unit 8 (see FIG. 48)
back and forth with ease. In the handle 1, an unlocking button 12
is provided integrally with the inner barrel 18. The unlocking
button 12 protrudes through a slot is so as to be movable along it.
When the unlocking button 12 is moved rightward as seen in FIG. 2,
the inner barrel 18 is unlocked from the coupling member 2,
allowing rotation of the handle 1 in the direction indicated by the
arrow A.
[0083] Reference numeral 4 represents a lock mechanism for the
extension pipe 6. A claw portion 4a is loaded with a force by a
compression spring 4b, with a supporting portion 4c used as a
fulcrum. The lock mechanism 4 engages with a hole (not shown)
provided in the extension pipe 6, and thereby the extension pipe 6
is locked to the coupling member 2. When a button portion 4d is
pressed, the claw portion 4a retracts from the hole, allowing
removal of the extension pipe 6.
[0084] In cleaning of a narrow area, the extension pipe 6 is
removed, and then the handle 1 is rotated, along the imaginary line
100, from the standard position shown in FIG. 2 to the position of
the extension pipe connection aperture 2a. The resulting state is
shown in FIG. 3. At this time, the inner barrel 18 reaches into the
extension pipe connection aperture 2a, and the mount 1b of the
handle 1 strikes the base plate 2c (see FIG. 1), thereby locking
the handle 1. Now, the handle 1 communicates with the hose 3,
allowing dust suction from the aperture at the free-end surface 1a.
Thus, the handle 1 can be used as a crevice nozzle.
[0085] This eliminates the need to take a crevice nozzle out of the
body 9 (see FIG. 48) of the electric vacuum cleaner and fit it into
the extension pipe connection aperture 2a. Thus, it is possible to
simplify the fitting of a crevice nozzle, and thereby enhance
user-friendliness. Moreover, it is also possible to prevent loss of
a crevice nozzle.
[0086] FIG. 4 shows the state of the coupling member 2 when it is
put on the floor surface F as when cleaning is suspended for a
while. By rotating the handle 1 along the imaginary line 100 and
locking it in an upright position relative to the coupling member
2, it is possible to increase the height H from the floor surface F
to the free-end surface 1a of the handle 1. Thus, it is possible to
reduce the stoop that the user needs to make to hold the handle 1
when restarting cleaning, and thereby reduce the burden on the
user.
[0087] Moreover, the portion 2d2 of the opening 2d into which the
handle 1 is inserted (when the handle 1 is in the standard
position) is continuous with the portion 2d1 of the opening 2d
through which the hose 3 passes. Accordingly, by placing the hose 3
through the portion 2d2 for insertion of the handle 1, it is
possible to arrange the extension pipe 6 and the hose 3
substantially in a straight line. This makes it possible to put the
coupling member 2 so low as to make contact with the floor surface
F, and thereby lower the position of the extension pipe 6. As a
result, it is possible to insert the extension pipe 6 with ease
into a narrow area such as a gap under a bed to perform
cleaning.
[0088] At this time, the handle 1 is in the upright position, and
therefore the user can move the nozzle unit 8 (see FIG. 48) with
ease, with a reduced stoop and thus with a reduced burden on the
user.
[0089] It is preferable to design the handle 1 to be lockable at a
plurality of rotation positions, because this allows the user to
select a suitable handle position. A lock mechanism for locking the
handle 1 has, for example, a structure as shown in FIG. 5. In this
figure, a lever 20 is coupled to the inner barrel 18 (see FIG. 2)
in such a way that a pin 20a provided integrally with the lever 20
is movably placed in a slot 1d provided in the handle 1. On an
outer wall of the coupling member 2, a locking plate 22 having a
plurality of grooves 22a is provided.
[0090] A tip portion 20b of the lever 20 engages with one of the
grooves 22a formed in the locking plate 22, and thereby the handle
1 is locked. When an unlocking button 12 is moved rightward as seen
in FIG. 5, the pin 20a moves along the slot id together with the
inner barrel 18, and thus the tip portion 20b is unlocked from the
groove 22a, allowing rotation of the handle 1.
[0091] As shown in FIG. 6, when the user, after unlocking the
handle 1, lifts the extension pipe 6 and the nozzle unit 8 while
holding the handle 1, the extension pipe 6 rotates by its own
weight in the direction indicated by the arrow C. At this time, a
chamfered portion 2f provided in the inner barrel 18 strikes the
coupling member 2, and thereby the inner barrel 18 is pressed to
permit the handle 1 to return to the standard position. This
structure is preferable, because it makes quick restarting of
cleaning possible.
[0092] FIG. 7A is a side view of the handle of the electric vacuum
cleaner of a second embodiment of the invention. In this
embodiment, a brush 13 is provided in the handle 1 shown in FIG. 2.
The handle 1 has a hole 1c formed in its mount 1b, and, into this
hole 1c, a supporting shaft 21 is fitted so that the handle 1 is
rotatable about the supporting shaft 21. At the free end of the
handle 1, a brush 13 is formed. To allow the brush 13 to be
covered, a covering member 14 is provided so as to be slidable
relative to the handle 1.
[0093] The covering member 14 has a lever 15 provided integrally
therewith. The lever 15 has a flange portion 15a, which is loaded,
by a compression spring 17, with a force that tends to move it
toward the supporting shaft 21 relative to a fixed plate 16
provided on the mount 1b. An end portion 15b of the lever 15 makes
contact with a cam 22 that is provided on the supporting shaft 21
so as to protrude axially.
[0094] In the same manner as in the first embodiment shown in FIGS.
2 and 3, the extension pipe 6 (see FIG. 48) is removed from the
coupling member 2. Next, when the handle 1 is rotated from the
state shown in FIG. 7A in which the brush 13 is covered by the
covering member 14, the covering member 14, pressed by the
compression spring 17, retracts according to the shape of the cam
21. The resulting state, in which the brush 13 is uncovered, is
shown in FIG. 7B.
[0095] This makes it possible to use the handle 1 as a dusting
brush, and thereby eliminates the need to take a dusting brush out
of the body 9 of the electric vacuum cleaner (see FIG. 48) and fit
it into the extension pipe connection aperture 2a. This enhances
user-friendliness, and also helps prevent loss of a dusting brush.
Moreover, since the brush 13, with dust and the like clung thereto,
is kept covered when not in use, it does not spoil the
appearance.
[0096] FIGS. 8A and 8C are sectional views, as seen from the side,
of the principal portion of the handle of the electric vacuum
cleaner of a third embodiment of the invention, and FIG. 8B is an
enlarged view of the portion indicated by D in FIG. 8A. In this
embodiment, a brush 13 is provided integrally with the inner barrel
18 of the handle 1 shown in FIG. 2. More specifically, the inner
barrel 18 has a nozzle 24 formed integrally therewith, and, at the
tip end of this nozzle 24, a brush 13 is provided. A covering
member 23 is provided slidably between the nozzle 24 and the outer
barrel if of the handle 1.
[0097] The covering member 23 has a stopper 23a. The stopper 23a
slides along a slot 1g formed in the outer barrel 1f, and thereby
restricts the movement stroke of the covering member 23. Moreover,
the covering member 23 is loaded with a force that tends to move it
so as to cover the brush 13 by a compression spring 7. As shown in
FIG. 8B, the inner barrel 18 has an air inlet port 18a that permits
the space between the nozzle 24 and the outer barrel if to
communicate with the inside of the inner barrel 18.
[0098] In the same manner as in the first embodiment, the extension
pipe 6 (see FIG. 48) is removed from the coupling member 2, and
instead the handle 1 is rotated to that position. When the electric
vacuum cleaner starts suction, the suction force acts on the
covering member 23 through the air inlet port 18a. As a result, the
covering member 23 moves in the direction indicated by the arrow E1
so as to uncover the brush 13. When the electric vacuum cleaner
stops suction, the compression spring 7 causes the covering member
23 to move in the direction indicated by the arrow E2. The
resulting state, in which the brush 13 is covered by the covering
member 23, is shown in FIG. 8C.
[0099] This structure serves the same purpose as that of the second
embodiment. In addition, in cleaning using the dusting brush, it is
possible to keep the dusting brush 13, with dust and the like clung
thereto, covered even in temporary suspension of dust suction so
that the dusting brush 13 does not spoil the appearance.
[0100] FIGS. 9A and 9B are sectional views, as seen from the side,
of the principal portion of the handle of the electric vacuum
cleaner of a fourth embodiment of the invention. A coupling member
2 is composed of a fixed portion 30 and a rotatable portion 31. The
fixed portion 30 has an extension pipe connection portion 30a in
which an extension pipe connection aperture 2a is formed. The
extension pipe connection portion 30a has a lock mechanism 4,
similar to the one shown in FIG. 2, for locking an extension pipe 6
(see FIG. 48). The rotatable portion 31 rotates about a supporting
shaft 21 while sliding along a cylindrical surface 30c of the fixed
portion 30. The rotatable portion 31 and the extension pipe
connection portion 30a are coupled together by a hose 25.
[0101] Moreover, the rotatable portion 31 has a hose connection
aperture 31a to which the hose 3 is connected. A handle 1 is formed
integrally with the rotatable portion 31. The hose 3 and the handle
1 rotate together, and can be locked in a desired position by a
lock mechanism (not shown).
[0102] In this embodiment, connecting together the rotatable
portion 31 and the extension pipe connection portion 30a with a
flexible hose 25 makes it possible to change easily the angle of
the handle 1, which is integral with the hose 3. Thus, as in the
first embodiment, by rotating the handle 1 to keep it in an upright
position relative to the fixed portion 30 when, for example,
cleaning is suspended for a while, it is possible to increase the
height from the floor surface to the free-end surface (not shown)
of the handle 1. This reduces the stoop that the user needs to make
to hold the handle 1 when restarting cleaning, and thereby reduces
the burden on the user.
[0103] Moreover, in cleaning of a gap below a bed or the like, it
is possible to set the handle 1 at a desired angle and thereby
allow the user to move the nozzle unit 8 (see FIG. 48) with ease
with a reduced stoop. Thus, it is possible to reduce the burden on
the user.
[0104] FIG. 10 is a side view of the principal portion of the
handle of the electric vacuum cleaner of a fifth embodiment of the
invention. A handle 1 is formed integrally with a coupling member
2, and the handle 1 is divided axially into a front portion 1h and
a rear portion 1k. The rear portion 1k is supported by a supporting
member 27 so as to be rotatable relative to the front portion 1h,
and the rear portion 1k is lockable at a desired angle. This makes
it possible to change easily the angle of the handle 1 and thereby
achieve the same purpose as achieved in the fourth embodiment.
[0105] FIGS. 11A and 11B are side views of the principal portion of
the handle of the electric vacuum cleaner of a sixth embodiment of
the invention. A handle 1 is formed integrally with a coupling
member 2, and the handle 1 is divided axially into a front portion
1h and a rear portion 1k, with an inclined interface 1m between
them. The rear portion 1k is supported by a supporting member 28 so
as to be rotatable about an axis in perpendicular to the inclined
interface 1m. The rear portion 1k can be rotated and locked, for
example, with the handle 1 in a bent state, as shown in FIG. 11B.
This makes it possible to change easily the angle of the handle 1
and thereby achieve the same purpose as achieved in the fourth
embodiment.
[0106] FIG. 12 is a sectional view, as seen from the side, of the
handle of the electric vacuum cleaner of a seventh embodiment of
the invention. In this embodiment, inside the handle 1 of the
electric vacuum cleaner of the fourth embodiment shown in FIG. 9, a
nozzle 24 slidable in the direction indicated by the arrow E is
provided. At the tip end of the nozzle 24, a brush 13 is formed.
Moreover, the nozzle 24 has an opening 1p formed so as to open to a
hose connection portion 31a. Accordingly, the air sucked in through
an extension pipe connection aperture 2a flows through this opening
1p to the hose 3.
[0107] As shown in FIG. 12, when the handle 1 is placed in the
standard position, the extension pipe connection portion 30a and
the handle 1 are arranged in a straight line. By removing the
extension pipe 6 (see FIG. 48) and thereby pressing the nozzle 24
toward the extension pipe connection aperture 2a, the brush 13 is
uncovered from the coupling member 2 as indicated by the
dash-and-dot lines 13'. At this time, a lock mechanism 4 locks the
nozzle 24 in the same way as it locks the extension pipe 6. Thus,
the air sucked through the brush 13 flows through the opening 1p to
the hose 3.
[0108] This structure makes it possible to use the handle 1 as a
dusting brush as in the second embodiment, and thereby eliminates
the need to take a dusting brush out of the body 9 of the electric
vacuum cleaner (see FIG. 48) and fit it into the extension pipe
connection aperture 2a. This enhances user-friendliness, and also
helps prevent loss of a dusting brush. Moreover, since the brush
13, with dust and the like clung thereto, is kept covered when not
in use, it does not spoil the appearance.
[0109] FIG. 13 is an external view of the electric vacuum cleaner
of an eighth embodiment of the invention. By a nozzle unit 8 having
a nozzle (not shown), a first pipe 35 is supported so as to be
rotatable in the direction indicated by the arrow J1. By the first
pipe 35, a second pipe 36 is supported so as to be rotatable in the
direction indicated by the arrow J2. To the second pipe 36, an
extension pipe 6 is connected. The extension pipe 6 is divided into
a front portion 6a and a rear portion 6b.
[0110] To a body 9 of the electric vacuum cleaner, a hose 3 is
connected. To the end of the hose 3, a coupling member 2 is coupled
that has a handle 1 to be held by the user and an operation switch
10 to be operated to control the operation of the electric vacuum
cleaner. The coupling member 2 is coupled to the extension pipe 6,
and thus dust suction from the nozzle is achieved.
[0111] FIGS. 14 and 15 are a perspective view and a bottom view
showing the detail of the nozzle unit 8. The nozzle unit 8 has a
body case 32, which is composed of a lower case 34 having a nozzle
34a formed in its bottom surface, an upper case 33 to which the
first pipe 35 is coupled, and a bumper 38 fitted between the upper
and lower cases 33 and 34. The bumper 38 protects the nozzle unit 8
from scratches and cracks that may result from its collision with a
wall or a piece of furniture.
[0112] On the bottom surface of the lower case 34, casters 39 are
provided at four locations so as to roll on the floor surface and
thereby allow movement of the nozzle unit 8. Moreover, as shown in
FIG. 16, which is a sectional view as seen from the front, inside
the nozzle unit 8, a rotary brush 40 is provided. In the upper case
33, an air inlet 33d (see FIG. 14) is provided to allow air to be
sucked in to make the rotary brush 40 rotate.
[0113] The first pipe 35 has a sliding portion 35a having an
arc-shaped cross section that slides along the inner surface of a
guide portion 33a having an arc-shaped cross section provided in
the upper case 33. As a result, the first pipe 35 is so supported
as to be rotatable in the direction indicated by the arrow J1
within an opening 33b. The second pipe 36 has a sliding portion 36a
that slides along the inner surface of a supporting portion 35b
provided in the first pipe 35. As a result, the second pipe 36 is
so supported as to be rotatable in the direction indicated by the
arrow J2.
[0114] Thus, it is possible to change the elevation (depression)
angle of the extension pipe 6 as the nozzle unit 8 is moved in the
direction indicated by G (in the direction of the depth, or the
shorter sides, of the nozzle unit 8) by rotation of the first pipe
35. (Hereinafter, this position of the nozzle unit will be referred
to as the "lateral position"). Moreover, as shown in FIG. 17, it is
possible to change the elevation (depression) angle of the
extension pipe 6 also as the nozzle unit 8 is moved in the
direction indicated by H (in the direction of the width, or the
longer sides, of the nozzle unit 8) by rotation of the second pipe
36. (Hereinafter, this position of the nozzle unit will be referred
to as the "longitudinal position"). In FIG. 17, reference numeral
36c represents the rotation axis of the second pipe 36.
[0115] In FIG. 16 described previously, the air sucked in through
the nozzle 34a and flowing in the direction indicated by the arrow
K1 then flows in the direction indicated by the arrow K2 toward the
first pipe 35. The air then flows through the first and second
pipes 35 and 36 as indicated by the arrows K3 and K4, then flows
through the extension pipe 6, and then reaches the body 9 of the
electric vacuum cleaner. Here, the first and second pipes 35 and 36
are coupled together in such a way that the air flow passages (K3
and K4) through the first and second pipes 35 and 36 are arranged
in a straight line when the nozzle unit 8 is used in the lateral
position. In addition, the rotation axis 36c of the second pipe 36
is kept perpendicular to the air flow passage (K3) through the
first pipe 35.
[0116] Thus, when the nozzle unit 8 is used in the lateral position
(see FIG. 14), which is more frequently the case than otherwise,
the air flow passage of the sucked air toward the extension pipe 6
has no bend at all. This makes it possible to reduce the loss in
suction pressure and thereby increase suction efficiently, and also
to reduce noise. Moreover, as shown in FIG. 18, which is a side
view, even when the second pipe 36 is rotated about the rotation
axis 36c relative to the first pipe 35, the air flow passages (K3
and K4) through the first and second pipes 35 and 36 are kept
arranged in a straight line all the time. Thus, when the first pipe
35 is in the upright position, the second pipe 36 rotates within a
plane perpendicular to the floor surface.
[0117] FIG. 19 is a top view of the nozzle unit 8 with the upper
cover 33 removed. The sliding portion 35a of the first pipe 35 is
arranged inside the body case 32, which is substantially
rectangular, as seen from above. Moreover, the first pipe 35 has a
rotation axis 35c substantially at the center of the depth W3 (i.e.
the shorter sides) of the body case 32. Accordingly, there is no
need to provide a protruding coupling portion 32a (see FIG. 49) as
is provided in the conventional example, and thus it is possible to
reduce the depth W3 of the nozzle unit 8 and thereby make the
nozzle unit 8 compact and light-weight. Furthermore, when the
nozzle unit 8 is used in the longitudinal position, there exists no
obstacle like the coupling portion 32a, and thus it is possible to
achieve enhanced user-friendliness.
[0118] Moreover, the rotation axis 36c (see FIG. 17) of the second
pipe 36 lies substantially at the center of the nozzle unit 8 in
the direction of the longer sides thereof. This ensures that, when
the nozzle unit 8 is used in the longitudinal position, the applied
force is borne substantially at the center of the body case 32. As
a result, a proper balance is obtained when the nozzle unit 8 is
moved back and force in the direction H (see FIG. 17). This helps
reduce staggering motion of the nozzle unit 8 and thereby enhance
user-friendliness. In FIG. 19, when the first pipe 35 is held in
the vertical position relative to the floor surface, the first and
second pipes 35' and 36', as indicated by the broken lines, are
arranged within the body case 32 in the direction of its depth.
This makes it possible to perform cleaning of an area as narrow as
the width W3 of the body case 32.
[0119] In FIG. 19 and in FIG. 18 described previously, the first
pipe 35 is substantially parallel to the floor surface. This makes
it possible to insert the nozzle unit 8 with ease deep into a
narrow area such as a gap below a bed, and thus leads to enhanced
user-friendliness. In this way, the first pipe 35 is rotatable from
a position substantially parallel to the floor surface to a
position substantially perpendicular thereto. This is achieved by a
rotation mechanism having a structure as shown in FIG. 20, which is
a sectional view thereof as seen from the side.
[0120] As described previously, to allow rotation of the first pipe
35, the sliding portion 35a of the first pipe 35 slides along the
inner surface of the guide portion 33a of the upper case 33. To
allow rotation from a position as shown in FIG. 20 in which the
first pipe 35 is substantially parallel to the floor surface to a
position in which it is substantially perpendicular thereto as
indicated by the dash-and-dot lines 35', the opening 33b of the
upper case 33 needs to be considerably large.
[0121] The lengths L1 and L2 of the front and rear portions of the
sliding portion 35a have limits because of the first pipe 35
colliding with the upper and lower cases 33 and 34. Accordingly,
between the opening 33b and the sliding portion 35a, an opening,
for example as indicated by M, is formed in an upper portion of the
body case 32. When the first pipe 35 is in the vertical position, a
similar opening is formed in a rear portion (i.e. on the right in
FIG. 20) of the body case 32.
[0122] To prevent such an opening (for example the opening
indicated by M) from communicating with the air flow passage of the
flow of air sucked in through the nozzle 34a, an engagement member
41 and a fixed member 42 as shown in FIG. 21, which is an exploded
perspective view of the rotation mechanism, are provided. The fixed
member 42 has an arc-shaped cross section. A fitting portion 42a'
formed at one end of the fixed member 42 engages with an engagement
portion 34d (see FIG. 20) of the lower case 34, and a fitting
portion 42a formed at the other end thereof is fitted into
projections 34c provided on the lower case 34 in such a way as to
pull the fixed member 42, which has resilience like a plate spring.
In this way, the fixed member 42 is fixed securely. The engagement
member 41 has an arc-shaped cross section, and is so arranged as to
slide along the inner surface of the sliding portion 35a of the
first pipe 35 and along the outer surface of the fixed member
42.
[0123] Here, since there is no coupling portion 32a as is provided
in the conventional example (see FIG. 49), it is not possible to
provide circular side plates 43 on the sliding portion 35a.
Therefore, the sliding potion 35a and the engagement member 41 are
held by being sandwiched between the guide portion 33a of the upper
case 33 and the fixed member 42 fixed to the lower case 34. This
helps prevent deformation in the arc-shaped cross sections of the
sliding portion 35a and the engagement portion 41 and thereby
obtain smooth rotation.
[0124] The engagement member 41 and the fixed member 42 have
cylindrical surfaces 41e and 42e and openings 41c and 42c. Through
these openings 41c and 42c, the flow of the sucked air flows to the
inside of the first pipe 35. The fixed member 42 has flanges 42f
formed at both sides thereof. These flanges 42f make contact with
the inner surface of the guide portion 33a. This helps shut off the
flow of air that flows from the sides of the engagement member 41
along the outer surface of the engagement member 41 to the opening
33b as indicated by the arrows P1 and P2, and thereby prevent
leakage of the sucked air.
[0125] In accordance with the rotation angle of the first pipe 35,
engagement claws 41b and 41d (see FIG. 20) provided on the
engagement member 41 engage with engagement claws 35f and 35g
provided on the sliding portion 35a. This allows rotation of the
engagement member 41. On the other hand, engagement claws 41f and
41g provided on the inner surface of the engagement member 41
engage with engagement claws 42b and 42d (see FIG. 20) provided on
the fixed member 42. This restricts rotation of the engagement
member 41.
[0126] Now, how the engagement member 41 moves as the first pipe 35
rotates will be described with reference to FIGS. 22 and 23 and
also FIG. 20 described previously. First, in the state shown in
FIG. 20, where the first pipe 35 is in the position substantially
parallel to the floor surface, the engagement claws 35f provided on
the sliding portion 35a engage with the engagement claws 41b
provided on the engagement member 41. Accordingly, the engagement
member 41 is rotated clockwise as seen in the figure, and thus
closes the upper portion of the opening 33b of the upper case
33.
[0127] At this time, the engagement claw 41g of the engagement
member 41 strikes the fixed member 42, and the engagement claw 41f
of the engagement member 41 engages with the engagement claw 42b of
the fixed member 42. This restricts rotation of the engagement
member 41. Moreover, an air inflow portion 35h of the first pipe 35
is partially closed by the engagement member 41 and the fixed
member 42.
[0128] As the first pipe 35 is rotated counter-clockwise, the air
flow passage in the air inflow portion 35h gradually widens. When,
as shown in FIG. 22, the inclination of the first pipe 35 becomes
equal to about 45.degree., the engagement claw 35g provided on the
sliding portion 35a engages with the engagement claw 41d provided
on the engagement member 41. At this time, the air flow passage in
the air inflow portion 35h has the maximum cross-sectional area.
Now, the upper portion 33b' of the opening 33b of the upper case 33
is closed by the sliding portion 35a, and the rear portion 33b"
thereof is closed by the engagement member 41 and the fixed member
42.
[0129] When the first pipe 35 is rotated further counter-clockwise,
the air flow passage in the air inflow portion 35h is kept having
the maximum cross-sectional area. When, as shown in FIG. 23, the
first pipe 35 strikes an end surface 33c of the opening 33b of the
upper case 33, rotation of the first pipe 35 is restricted. At the
same time, the engagement claw 42d provided on the fixed member 42
engages with the engagement claw 41g provided on the engagement
member 41, and thereby rotation of the engagement member 41 is
restricted.
[0130] Next, when the first pipe 35 is rotated clockwise from the
state shown in FIG. 23, the air flow passage in the air inflow
portion 35h is gradually narrowed by the engagement member 41. When
the inclination of the first pipe 35 becomes equal to about
45.degree., the air flow passage in the air inflow portion 35h has
the minimum cross-sectional area. When the first pipe 35 is rotated
further clockwise, the air flow passage in the air inflow portion
35h is kept having the minimum cross-sectional area. Eventually,
the first pipe 35 strikes the lower case 34, restoring the state
shown in FIG. 20.
[0131] The structure as described above makes it possible to rotate
the first pipe 35 from a position substantially parallel to the
floor surface to a position substantially perpendicular thereto.
When the nozzle unit 8 is used in the lateral position, which is
more frequently the case than otherwise, and in addition when the
inclination of the first pipe 35 is in the range from about
45.degree. to 60.degree., which is more frequently the case than
otherwise, by rotating the first pipe 35 once to the position
substantially parallel to the floor surface and then backward, it
is possible to maximize the cross-sectional area of the air flow
passage in the air inflow portion 35h. Thus, it is possible to
achieve increased suction efficiency in the state in which the
nozzle unit 8 is most frequently used.
[0132] Similarly, when the nozzle unit 8 is used in the
longitudinal position, in which case the inclination of the first
pipe 35 equals about 90.degree., the air flow passage in the air
inflow portion 35h has the maximum cross-sectional area, and thus
it is possible to achieve high suction efficiency. To allow the air
flow passage in the air inflow portion 35h to have the maximum
cross-sectional area when the inclination of the first pipe 35 is
otherwise (for example 30.degree. to 60.degree.), it is also
possible to provide another engagement member between the
engagement member 41 and the fixed member 42.
[0133] In FIG. 20 described previously, in the front-end portion of
the engagement member 41, a shield portion 41a is provided that
makes contact with the inner surface of the upper case 33. If dust
or the like, entering through the opening 33b of the upper case 33,
collects in the lower front portion (indicated by N) of the fixed
member 42, it is difficult to remove it. The shield portion 41a
serves to shield this gap between the fixed member 42 and the upper
case 33. As a result, even if dust or the like enters through the
opening 33b, it collects on the shield portion 41a, which is closer
to the opening 33b, and thus it is easy to remove it.
[0134] In cleaning of, for example, a gap below a bed, since the
nozzle unit 8 is kept invisible, the force applied thereto tends to
deviate from the intended direction. This causes unintended
rotation of the second pipe 36 and thus staggering motion of the
body case 32. In FIG. 20, when the first pipe 35 is in the position
substantially parallel to the floor surface, a pin 44 provided on
the lower case 34 engages, through a through hole 35e provided in
the first pipe 35, with an engagement portion 36e having a
semi-circular cross section provided in the second pipe 36. This
prevents staggering motion of the body case 32. The pin 44 and the
through hole 35e are made so small as to cause almost no drop in
the suction force due to leakage of the sucked air.
[0135] FIG. 24 is an exploded perspective view of another example
of the structure of the engagement member 41. As compared with the
one shown in FIG. 21 described previously, the engagement member 41
is extended in the direction of its longer sides, and has slots 41f
provided in the cylindrical surfaces 41e' constituting the extended
portion thereof. The flow of air sucked through the air inlet 33d
(see FIG. 14) of the upper case 33 into the nozzle unit 8 flows
through the slots 41f and blows on the blades 50 (see FIG. 20) of
the rotary brush 40, thereby rotating the rotary brush 40. This
causes rotating brushes 47 to rotate and thereby rake up dust from
the floor surface. Thereafter, the dust, together with the flow of
the sucked air, flows toward the first pipe 35 as indicated by the
arrow K2 in FIG. 16.
[0136] In the engagement member 41 shown in FIG. 21, the air sucked
in through the upper case 33 immediately flows toward the first
pipe 35. By contrast, in the engagement member 41 shown in FIG. 24,
the air sucked in first flows through the slots 41f to a portion
closer to the blades 50 and then flows toward the first pipe 35.
This makes it possible to rotate the rotary brush 40 efficiently
and thereby increase suction efficiency.
[0137] The positions of the slots 41f vary according to the
rotation direction of the first pipe 35 as the first pipe 35
rotates, but the slots 41f remain substantially in the same
positions relative to the first pipe 35. Thus, it is possible to
keep at all times the slots 41f in such positions relative to the
first pipe 35 that the sucked air efficiently blows on the blades
50.
[0138] FIG. 25 is an exploded perspective view of the portion
around a caster 39 of the nozzle unit 8 of the embodiment under
discussion. A caster 39 is supported by a caster mount 46, which
has a pair of supporting ribs 46c each having a horizontally long
slot 46e. Into these slots 46e, a caster shaft 39a fixed to the
caster 39 is loosely fitted. The caster shaft 39a may be formed
integrally with the caster 39 to reduce the number of components.
The caster mount 46 has a pivot 46a having resilience radially. In
the lower case 34, a recessed portion 34e is provided that has a
pivot socket 45 formed integrally. The pivot 46a is fitted into the
pivot socket 45. The pivot 46a of the caster mount 46 has a stopper
46b formed at the end. This stopper 46b engages with an end surface
45a of the pivot socket 45 so as to prevent the caster 39 from
dropping out.
[0139] The recessed portion 34e is so formed as to have an opening
in the circumferential surface 34f of the lower case 34. This helps
prevent dust or the like from collecting in the recessed portion
34e. The caster 39 and the caster mount 46 are so formed as not to
protrude from the circumferential surface 34f. This helps prevent
damage to the caster 39 or scratches on a wall or a piece of
furniture resulting from collision between them during cleaning.
Moreover, reinforcing ribs 46d are provided so as to bridge between
the pair of supporting ribs 46c in order to reinforce the
supporting ribs 46c and thereby obtain higher reliability in the
function of the caster.
[0140] In this structure, the caster 39 is fitted so as to be
freely rotatable about the pivot 46a. This ensures smooth change of
the movement direction of the nozzle unit 8 between directions G
and H (see FIG. 14). Moreover, the caster 39 does not slide but
rolls, and thereby prevents scratches on the flooring or the like.
Moreover, since the caster shaft 39a is supported by the slots 46e,
the caster 39 can move translationally. This makes the caster 39
more susceptible to the moment that tends to change the movement
direction and thereby ensures smoother change of the movement
direction. Furthermore, it is preferable to form the caster 39 so
as to have a smaller diameter in the edge portions 39b" of its
circumferential surface than in the central portion 39b' thereof,
because this makes it possible to keep the caster 39 substantially
in point contact with the floor surface and thereby make it even
more susceptible to the moment that tends to change the movement
direction.
[0141] FIG. 26 is an exploded perspective view showing another
example of the structure of the portion around a caster 39. On a
bearing surface 46f of a caster mount 46, a plurality of balls 49
are arranged by being positioned by a ring 48. The balls 49 are
held between the bearing surface 46f and a bearing surface (not
shown) provided on the bottom surface of a fixed base 50. The
caster mount 46 is fixed to a recessed portion 34e (see FIG. 25) by
a pin 47. This structure serves the same purpose as the previously
described structure does.
[0142] When the nozzle unit 8 described above is used in the
longitudinal position, the first and second pipes 35 and 36 are
rotated, from the state shown in FIG. 13 described earlier, in the
directions indicated by arrows J1 and J2, respectively. At this
time, the extension pipe 6, the coupling member 2, and the hose 3
move together, bringing the handle into a state pointing to the
side as shown in FIG. 27. However, in the embodiment under
discussion, by operating a button 53, it is possible to rotate the
coupling member 2 in the direction indicated by the arrow Q
relative to the extension pipe 6 as shown in FIG. 28, so that the
handle 1 and the operation switch 10 point upward. As a result,
even when the nozzle unit 8 is used in the longitudinal position,
the handle 1 and the operation switch 10 can be used in the same
way as when the nozzle unit 8 is used in the lateral position, and
thus enhanced user-friendliness is achieved in cleaning.
[0143] Now, the rotation mechanism of the coupling member 2 will be
described with reference to a sectional view and a partial
sectional view thereof shown in FIGS. 29 and 30, respectively. On
the outer surface of the hollow extension pipe 6, a coupling groove
(a first groove) 55 is provided circumferentially. Moreover, on the
outer surface of the extension pipe 6, a plurality of locking
grooves (second grooves) 56 are provided around the same
circumference. On the coupling member 2, a lock mechanism 60 for
coupling the extension pipe 6 is provided. The lock mechanism 60 is
supported so as to be rotatable about a rotation axis 60a. The lock
mechanism 60 has, at one end thereof, a button 53 (a disengaging
member) that protrudes through a hole 2c provided in the coupling
member 2. The lock mechanism 60 has, at the other end thereof, a
first and a second projection (a first and a second engagement
member) 57 and 58 that can engage with the first and second grooves
55 and 56, respectively.
[0144] The button 53 is loaded with a force that tends to move it
upward as seen in the figures by a compression spring 54.
Accordingly, the first and second projections 57 and 58 are pressed
against the extension pipe 6. With the button 53 pressed with a
finger, the extension pipe 6 is inserted into the coupling member
2. By releasing the finger from the button 53, since the first
projection 57 has a smaller rotation radius than the second
projection 58 with respect to the rotation axis 60a as shown in
FIG. 31, it is possible to engage the first projection 57 with the
coupling groove 55 without engaging the second projection 58 with
the locking grooves 56. In this way, the coupling member 2 and the
extension pipe 6 are rotatably coupled together.
[0145] When the coupling member 2 is rotated relative to the
extension pipe 6, the second projection 58 slides along the outer
surface of the extension pipe 6, and then the second projection 58
engages with one of the locking grooves 56 as shown in FIGS. 29 and
30 described previously, locking the coupling member 2 in a
predetermined position relative to the extension pipe 6.
[0146] Removal of the extension pipe 6 from the coupling member 2
is achieved in the following manner. By pressing the button 53 (a
disengaging member) with a finger, as shown in FIG. 31, the second
projection 58 is disengaged from the locking groove 56. By pressing
the button 53 further with a finger, as shown in FIG. 32, the first
projection 57 is disengaged from the coupling groove 55. In this
state, by pulling out the extension pipe 6, it is removed from the
coupling member 2.
[0147] As shown in FIG. 33, which is a sectional view as seen from
the front, the locking grooves 56 are arranged at three locations,
i.e. at the location indicated by solid lines where the button 53
of the lock mechanism 60 points upward (hereafter referred to as
the "normal position") and at the locations indicated by
dash-and-dot lines 90.degree. apart rightward and leftward from the
normal position (hereafter referred to as the "90.degree.
positions").
[0148] When the nozzle unit 8 is used in the lateral position (see
FIG. 13), the coupling member 2 is in the normal position. When the
nozzle unit 8 is used in the longitudinal position (see FIG. 28),
the coupling member 2 is in one of the 90.degree. positions. Thus,
in either case, the handle 1, the operation switch 10, and the
button 53 can be made to point upward. The locking grooves 56 may
be arranged at other locations than described above.
[0149] As shown in FIG. 34, which is a detail view of the portion R
shown in FIG. 33, the locking grooves 56 have, as their
circumferential wall surfaces, inclined surfaces 56a. As a result,
simply by rotating the coupling member 2 relative to the extension
pipe 6 without pressing the button 53, the second projection 58
runs on to the inclined surface 56a against the load with which it
is loaded by the compression spring 54, allowing switching between
the normal and 90.degree. positions. This makes switching of the
rotation position easy.
[0150] However, the locking grooves 56 at the 90.degree. positions
have, as their wall surface 56b farther from the normal position,
non-inclined surfaces, so that these surfaces serve as stoppers
that restrict the rotation range by being struck by the second
projection 58 and thereby prevent the coupling member 2 from being
rotated out of the rotation range. This makes switching to the 90
positions easier and thereby enhances user-friendliness.
[0151] FIG. 35 is a sectional view of the portion of the extension
pipe 6 at which the coupling groove 55 is formed. At those
locations of the bottom of the coupling groove 55 which correspond
to the locking grooves 56, grooves 55c deeper than the coupling
groove 55 are provided. By engaging the first projection 57 with
one of these grooves 55c, it is possible to lock the coupling
member 2 and the extension pipe 6 together more securely in the
predetermined rotation positions (the normal and 90.degree.
positions). Moreover, in the same manner as described above,
inclined surfaces 55a and stopper surfaces 55b are provided to
allow easy switching of the rotation position. Furthermore, by
forming the coupling groove 55 as shown in FIG. 35, it is possible
to lock the coupling member 2 and the extension pipe 6 in the
predetermined rotation positions by using the first projection 57,
and thus omit the second projection 58. This helps simplify the
structure.
[0152] FIGS. 36 and 37 are a sectional view and a partial sectional
view, respectively, of another example of the structure of the lock
mechanism 60 for locking together the coupling member 2 and the
extension pipe 6. This lock mechanism 60 is different from the lock
mechanism 60 shown in FIG. 29 in that the second projection 58 is
composed of a ball 58' loaded with a force by a compression spring
52 and is provided separately from the first projection 57.
[0153] When the coupling member 2 is rotated relative to the
extension pipe 6, with the first projection 57 sliding along the
coupling groove 55, the ball 58', which is loaded with a force,
travels out of the locking groove 56, then travels along the
inclined surface 56a (see FIG. 34), then runs on to the outer
surface of the extension pipe 6, and then moves over to another
locking groove 56. Thus, this structure serves the same purpose as
the previously described structure does.
[0154] By pressing the button 53 with a finger, the first
projection 57 is disengaged from the coupling groove 55. In this
state, when the extension pipe 6 is pulled out, the ball 58' runs
on to the outer surface of the extension pipe 56 as shown in FIG.
38 so as to allow removal of the extension pipe 6 from the coupling
member 2. Here, the locking groove 56 has an inclined surface 56c
as its wall surface closer to the coupling member 2, i.e. the wall
surface that lies in the direction in which the extension pipe 6 is
pulled out (along the rotation axis). An inclined surface is
preferable here because it ensures smooth movement of the ball 58'
and thus easy removal of the extension pipe 6.
[0155] Coupling between the coupling member 2 and the extension
pipe 6 does not necessarily have to be achieved by engaging a
groove (the coupling groove 55 and the locking grooves 56) provided
in the outer surface of the extension pipe 6 with an engagement
member (the first and second projections 57 and 58 and the ball
58') provided on the coupling member 2, but may be achieved in any
other manner. For example, it is possible to provide a groove in
the coupling member 2 and provide an engagement member on the
extension pipe 6; or it is possible to provide a groove in the
inner surface of the extension pipe 6.
[0156] FIG. 39 is a sectional view, as seen from the side, of the
nozzle unit 8 of the electric vacuum cleaner of a ninth embodiment
of the invention. The nozzle unit 8 of this embodiment is intended
to replace that of the eighth embodiment shown in FIG. 14, and
therefore such components as are found also in the eighth
embodiment are identified with the same reference numeral. The
electric vacuum cleaner as a whole has the same structure as shown
in FIG. 13. The nozzle unit 8 has a body case 32, which is composed
of a lower case 34 having a nozzle (not shown) formed in its bottom
surface, an upper case 33 to which a first pipe 35 is coupled, and
a bumper 38 fitted between the upper and lower cases 33 and 34.
[0157] To the first pipe 35, a second pipe 36 is coupled. To the
second pipe 36, an extension pipe 6 (see FIG. 13) is coupled, which
is comparatively long. Through the first and second pipes 35 and
36, the sucked air flows toward a body 9 of the electric vacuum
cleaner as indicated by the arrow K4. As in the eighth embodiment,
the first pipe 35 has a sliding portion 35a having an arc-shaped
cross section that slides along the inner surface of a guide
portion 33a having an arc-shaped cross section of the upper case
33. Thus, the first pipe 35 is so supported as to be rotatable in
the direction indicated by the arrow J1 within an opening 33b.
[0158] A bottom surface of the first pipe 35 is fitted to the
second pipe 36 with a screw 63 so as to be rotatable about a
rotation axis 36c, and is covered by a cover 64. A top surface of
the first pipe 35 is fitted to a pipe cover 62 with a screw 65 so
as to be rotatable about the rotation axis 36c. The pipe cover 62
is fixed to the second pipe 36 with screws 66.
[0159] Thus, as in the eighth embodiment, when the nozzle unit 8 is
used in the lateral position, the elevation (depression) angle of
the extension pipe 6 can be changed by means of the first pipe 35.
In addition, as shown in FIG. 28 described earlier, when the nozzle
unit 8 is used in the longitudinal position, the elevation
(depression) angle of the extension pipe 6 can be changed by means
of the second pipe 36.
[0160] FIG. 40 shows how the first and second pipes 35 and 36 are
coupled together. As shown in this figure, the first pipe 35 has an
opening 35d formed so as to extend through a range of angles
.theta.3. The flow of the sucked air flows through this opening 35d
to the second pipe 36. An end surface 35e of the opening 35d is hit
by a stopper portion 36b of the second pipe 36, and thereby the
rotation range .theta.2 of the second pipe 36 in the direction J2
is restricted.
[0161] When the nozzle unit 8 is used in the lateral position, the
second pipe is positioned substantially at the center of its
rotation range .theta.2. To prevent inflow of the ambient air
through the opening 35d at this time, shutters 67a and 67b are
provided on the inner surface of the first pipe 35. The shutters
67a and 67b are loaded with forces that tend to move them clockwise
and counter-clockwise, respectively, by a force-loading spring 69,
and are so arranged as to be slidable along the inner surface of
the first pipe 35.
[0162] When the nozzle unit 8 is used in the longitudinal position,
by inclining the second pipe 36 as shown in FIG. 41, an engagement
portion 36c of the second pipe 36 engages with the shutter 67a.
Thus, the shutter 67a rotates together with the second pipe 36 so
as to shield the opening 35d. By returning the second pipe 36 to
the original position shown in FIG. 40, the shutter 67a returns to
its original position by the action of the force-loading spring 69.
Similarly, by inclining the second pipe 36 in the opposite
direction, an engagement portion 36d engages with the shutter 67b
so as to shield the opening 35d. This prevents influx of the
ambient air and thereby prevents a drop in suction efficiency.
[0163] When the nozzle unit 8 is used in the lateral position, free
rotation of the second pipe 36 from the position shown in FIG. 40
is prevented by a click mechanism (a restricting means). In FIG. 39
described previously, the click mechanism has a steel ball 68 and a
locking plate 61 provided between the pipe cover 62 and the first
pipe 35.
[0164] FIG. 42 shows the detail of the click mechanism. The first
pipe 35 has a boss 35f, into which a compression spring 70 is
fitted. On the inner surface of the pipe cover 62, a locking plate
61 having a hole 61a is fixed. Between the locking plate 61 and the
compression spring 70 is arranged a steel ball 68. Engaging the
steel ball 68 with the hole 61a produces a click.
[0165] Thus, a predetermined rotation force is required to rotate
the second pipe 36, which is integral with the pipe cover 62. This
prevents free rotation of the second pipe 36 and thereby prevents
degradation of cleaning efficiency due to staggering motion of the
body case 32. A felt ring 71 is fitted to the boss 35f to prevent
entry of dust and thereby prevent variation over time of the
clicking force produced by the steel ball 68.
[0166] Moreover, when the predetermined rotation force is applied
to the second pipe 36 to rotate it relative to the first pipe 35,
the steel ball 68 retracts against the force with which it is
loaded by the compression spring 70. Then, the steel ball 68 rolls
along the inner surface of the locking plate 61. Therefore, when
the nozzle unit 8 is used in the longitudinal position, the second
pipe 36 can rotate freely.
[0167] In FIG. 39 described previously, a rotary brush 40 has, on
its shaft portion 49, blades 50 made of a flexible material such as
rubber and brushes 47. The blades 50 each have a plurality of
through holes 50a formed so as to extend in the direction of a
radius of the rotary brush 40 and arranged in a line extending in
the direction of the length of the rotary brush 40. As shown in
FIG. 43, the air sucked through the air inlet 33d provided in the
upper case 33 into the body case 32 flows into the shaft portion 49
from the side of the rotary brush 40. The air then flows through
the shaft portion 49 and then blows out through the through holes
50a.
[0168] When the rotary brush 40 rotates in the direction indicated
by the arrow S shown in FIG. 39, the brushes 47 and the blades 50
rake up dust from the floor surface such as a carpet. At this time,
air blows out through the through holes 50a on the floor surface to
help dust to be raked up. This leads to enhanced dust collecting
performance.
[0169] In FIG. 43, the rotary brush 40 is fixed inside the body
case 32 in such a way as to be loaded, at one end, with a force by
a compression spring 78 through an attachment/detachment button 75.
The attachment/detachment button 75 is, at its shaft portion 75b,
pivoted on the body case 32 so as to be rotatable in the direction
indicated by the arrow V1, with a certain amount of play 77 secured
so as to permit the shaft portion 75b to move upward as seen in the
figure within the body case 32. The lower case 34 has a projecting
rib 34e.
[0170] When the nozzle unit 8 is subjected to a shock resulting
from, for example, a drop from a higher position, the projecting
rib 34e restricts rotation of the attachment/detachment button 75
and thereby prevents the rotary brush 40 from dropping out. When a
button portion 75a of the attachment/detachment button 75 is pulled
up in the direction indicated by the arrow V2, the shaft portion
75b moves as much as the play 77 permits. At this time, the
attachment/detachment button 75 can be rotated without interference
with the projecting rib 34e. This allows attachment and detachment
of the rotary brush 40.
[0171] FIGS. 44 and 45 are a sectional view, as seen from the side,
and a bottom view, respectively, of the nozzle unit of the electric
vacuum cleaner of a tenth embodiment of the invention. For
simplicity's sake, such components as are found also in the
conventional example shown in FIG. 48 are identified with the same
reference numerals. The electric vacuum cleaner as a whole has the
same structure as the conventional example. The nozzle unit 8 has
an outer casing composed of an upper case 33 and a lower case 34.
To a body 9 of the electric vacuum cleaner, an extension pipe 6
(see FIG. 48) is connected. To the extension pipe 6, a second pipe
36 is connected. To the second pipe 36, a first pipe 35 is coupled.
The first pipe 35 is held between the upper and lower cases 33 and
34. The elevation (depression) angle of the extension pipe 6 can be
adjusted by means of the first pipe 35.
[0172] In the lower case 34, a nozzle 34a is formed so as to open
toward the floor surface. The dust sucked in through the nozzle 34a
flows, together with the flow of the sucked air, through the air
flow passage 89 in the direction indicated by the arrow K3 to the
body 9 of the electric vacuum cleaner, and thereby dust collection
is achieved. In front of and behind the nozzle 34a are provided
casters 37 and 39 that rotate while keeping the distance between
the nozzle 34a and the floor surface constant, allowing movement of
the nozzle unit 8.
[0173] At the front of the nozzle unit 8 is provided a bumper 38,
which serves as a shock absorber when the nozzle unit 8 collides
with a wall or the like. Behind the nozzle 34a is provided a brush
member 51 for raking up dust clung to a carpet or the like. In
front of the nozzle 34a is provided a flexible member 52. At both
ends of the flexible member 52, aid pieces 81 are fitted so as to
make contact with the floor surface. Thus, as the nozzle unit 8
moves back and forth, the flexible member 52 is made to rotate by
the friction force between the aid pieces 81 and the floor
surface.
[0174] FIG. 46 is an exploded perspective view showing the detail
of the flexible member 52. On a supporting shaft 52a, a sealing
piece 52b is provided so as to project therefrom. At both ends of
the supporting shaft 52a, insertion shafts 52e are formed, which
are fitted into insertion holes 81a of the aid pieces 81. On the
sealing piece 52b are provided a plurality of conical projections
52g. The projections 52g are arranged in two rows X1 and X2 along
the length of the sealing piece 52b. To allow the supporting shaft
52a and the aid pieces 81 to rotate together, engagement pieces 52f
are provided on the insertion shafts 52e, and engagement grooves
81b into which the engagement pieces 52f are fitted are provided in
the insertion holes 81a of the aid pieces 81.
[0175] The aid pieces 81 each have three fin-like portions 81c,
81d, and 81e formed so as to extend radially around the insertion
holes 81a. The fin-like portions 81c, 81d, and 81e are made so long
as to make contact with the floor surface. The supporting shaft
52a, the sealing piece 52b, and the projections 52g are formed
integrally by molding out of a hard resin material such as ABS
resin, polypropylene, or polyethylene. The aid pieces 81 are formed
out of a soft material such as hard rubber.
[0176] FIG. 47 is a detail sectional view showing the principal
portion of the front portion of the nozzle unit 8, with the
above-described flexible member 52 attached. The supporting shaft
52a is held by a groove 84 formed by a curved-surface plate 82
having a substantially J-like shape provided on the lower case 34
and a curved-surface portion 83b of a detachable engagement claw
83. The supporting shaft 52a of the flexible member 52 is fitted
into this groove 84 and is held by the engagement claw 83 so as not
to drop off. The sealing piece 52b strikes a front stopper portion
83a provided in the engagement claw 83 and a rear stopper portion
82a provided in the curved-surface plate 82, and thereby the
rotation range a of the flexible member 52 is restricted.
[0177] When the nozzle unit 8 is moved forward, by the friction
force between the fin-like portions 81c and 81d of the aid pieces
81, which are in contact with the floor surface, and the floor
surface, the sealing piece 52b is rotated backward so as to strike
the rear stopper portion 82a. At this time, the fin-like portion
81e makes contact with the floor surface, and thus an opening is
formed in front of the nozzle 34a to allow easy suction of
large-particle dust and dust by a wall.
[0178] When the nozzle unit 8 is moved backward, by the friction
force between the fin-like portions 81e and 81d, which are in
contact with the floor surface, and the floor surface, the sealing
piece 52b is rotated forward so as to strike the front stopper
portion 83a. At this time, the fin-like portion 81c makes contact
with the floor surface. Thus, the sealing piece 52b ensures that no
opening is left in front of the nozzle 34a, and thereby increases
the degree of vacuum at the nozzle 34a and thus the suction
power.
[0179] In cases where the surface to be cleaned is a carpet or the
like, the casters 37 and 39 sink into the carpet or the like. As
the nozzle unit 8 is moved backward, the projections 52g of the
sealing piece 52b rake up fluffy dust, hair, and the like clung to
the carpet or the like so as to allow such dust to be sucked
through the nozzle 34a. Thus, it is possible to achieve raking of a
carpet or the like with ease and thereby increase dust collection
efficiency. Here, since the projections 52g are conical, the fluffy
dust, hair, and the like raked up can be removed therefrom with
ease by the suction force. This helps prevent clinging of raked-up
dust.
[0180] In this embodiment, arranging the projections in a plurality
of rows X1 and X2 (see FIG. 46) makes it possible to efficiently
rake up fluffy dust, hair, and the like at different depths in a
carpet or the like. Moreover, it is preferable to arrange the
projections 52g in the row X1 and the projections 52g in the row X2
at different locations in the length direction, because this makes
it possible to perform raking at shorter intervals and thereby
increase dust collection efficiency. The projections may be
arranged in more than two rows. Furthermore, by arranging the
projections 52g near the lower edge 52h (see FIG. 46) of the
sealing piece 52b, it is possible to rake deep into the surface to
be cleaned and thereby further increase dust collection
efficiency.
* * * * *