U.S. patent number RE47,931 [Application Number 15/951,162] was granted by the patent office on 2020-04-07 for ball joint orientation device applicable to unipod.
The grantee listed for this patent is Guangdong Sirui Optical Co., Ltd.. Invention is credited to Jie Li.
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United States Patent |
RE47,931 |
Li |
April 7, 2020 |
Ball joint orientation device applicable to unipod
Abstract
A ball joint orientation device applicable to a unipod includes
a ball joint and stop members, in which one end of the ball joint
is formed as a rotating part and is arranged in a ball joint seat
in a universal swaying manner, and the other end extends to form a
connecting part and is fixedly connected with a main rod; the stop
members are arranged in the ball joint seat, and include a locking
stop member located at the upper side of the rotating part; an
orientation knob is sleeved on the connecting part and/or the main
rod; when screwed toward the direction close to the ball joint
seat, the ball joint is subjected to orienting locking and no
longer rotates; and when screwed toward the direction away from the
ball joint seat, and the orienting locking is released, so the ball
joint is rotatable freely.
Inventors: |
Li; Jie (Zhongshan,
CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Guangdong Sirui Optical Co., Ltd. |
Zhongshan |
N/A |
CN |
|
|
Family
ID: |
49132957 |
Appl.
No.: |
15/951,162 |
Filed: |
April 11, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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Reissue of: |
13967258 |
Aug 14, 2013 |
9309920 |
Apr 12, 2016 |
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Foreign Application Priority Data
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Jun 28, 2013 [CN] |
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2013 1 0266409 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F16M
11/28 (20130101); F16C 11/0623 (20130101); G03B
17/561 (20130101); G03B 17/561 (20130101); F16C
11/106 (20130101); F16C 11/0623 (20130101); F16M
11/2078 (20130101); F16C 11/106 (20130101); F16M
11/28 (20130101); F16M 11/2078 (20130101); Y10T
403/32311 (20150115); Y10T 403/32754 (20150115); Y10T
403/32754 (20150115); F16M 2200/022 (20130101); Y10T
403/32311 (20150115); F16M 2200/022 (20130101) |
Current International
Class: |
F16C
11/06 (20060101); G03B 17/56 (20060101); F16M
11/20 (20060101); F16M 11/28 (20060101); F16C
11/10 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2226465 |
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Jul 1999 |
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CA |
|
201373969 |
|
Dec 2009 |
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CN |
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201621438 |
|
Nov 2010 |
|
CN |
|
Other References
First Office Action issued Apr. 21, 2015, by the Taiwan Patent
Office in corresponding Taiwan Patent Application No. TW-102142246,
with English translation (8 pages). cited by applicant .
English translation of a Search Report dated Nov. 17, 2014, with a
Written Opinion dated Nov. 21, 2014, issued by the Intellectual
Property Office of Singapore (IPOS) in corresponding Singapore
Patent Application No. SG-2013082185 (10 pages). cited by applicant
.
Benro VT1 Monopod Stand, May 22, 2013;
http://www.benrokorea.co.kr/shop/goods/goods_view.php?&goodsno=314.
(9 pages). cited by applicant.
|
Primary Examiner: Doerrler; William C
Attorney, Agent or Firm: Loeb & Loeb LLP
Claims
The invention claimed is:
1. A ball joint orientation device applicable to a .[.unipod.].
.Iadd.monopod.Iaddend., comprising.Iadd.:.Iaddend. a ball joint;
stop members; a ball joint seat; and a main rod; wherein, one end
of said ball joint .[.is formed as.]. .Iadd.comprises .Iaddend.a
rotating part and is arranged in said ball joint seat in a
universal swaying manner, and the other end .Iadd.of said ball
joint .Iaddend.extends to form a connecting part and is
.[.fixedly.]. connected with said main rod; said stop members
.[.are.]. .Iadd.being .Iaddend.arranged in said ball joint seat,
and said stop members .[.comprise.]. .Iadd.comprising .Iaddend.a
locking stop member located at .[.an upper.]. .Iadd.one
.Iaddend.side of said rotating part.Iadd., wherein said locking
stop member is a first ball joint stop ring and disposed at one end
of said ball joint seat, and a surface of said ball joint seat
abutting against a spherical surface of said rotating
part.Iaddend.; said stop members .[.further comprise.].
.Iadd.comprising .Iaddend.a .[.lower.]. .Iadd.first .Iaddend.stop
member adapted for limiting a position of the ball joint and
located at a .[.lower.]. .Iadd.first .Iaddend.side of said rotating
part, an upper surface of the .[.lower.]. .Iadd.first .Iaddend.stop
member abuts against the rotating part.Iadd., wherein said first
stop member is a second ball joint stop ring disposed in the ball
joint seat.Iaddend.; .[.said device further comprises.]. an
orientation knob sleeved around the connecting part .[.and/or said
main rod.]. .Iadd.via a threaded connection.Iaddend., and said
orientation knob .[.can be screwed.]. .Iadd.being transitioned
.Iaddend.towards or away from said ball joint seat.[., so as to
move upward or downward.].; .Iadd.wherein .Iaddend.said orientation
knob .[.is able to abut.]. .Iadd.abuts .Iaddend.against an end face
of said ball joint seat by .[.being screwed.]. .Iadd.moving
.Iaddend.towards said ball joint seat, and, .Iadd.wherein
.Iaddend.said locking stop member locks said ball joint.[., so
as.]. to prevent said ball joint from rotating; .[.and.].
.Iadd.wherein .Iaddend.said orientation knob .[.becomes
separated.]. .Iadd.separates .Iaddend.from said ball joint seat
.[.by being screwed.]. .Iadd.in response to being transitioned
.Iaddend.away from said ball joint seat.[., so as.]. to release
said ball joint and allow the ball joint .[.to rotate.]. .Iadd.for
rotating .Iaddend.freely, wherein said main rod and said connecting
part are .[.fixedly.]. connected together through a main rod joint,
one end of said main rod joint is sleeved around said main rod and
in threaded connection with one end of said main rod, and the other
end of said main rod joint is sleeved around said connecting part
and in threaded connection with said connecting part.[.,.]..Iadd.;
and.Iaddend. .[.said orientation knob is sleeved around said main
rod joint, and in threaded connection with said main rod joint or
said connecting part, said lower stop member is a ball joint lower
stop ring made of plastic, and the ball joint lower stop ring is
fixed in ball joint seat, said locking stop member is a ball joint
upper stop ring made of rubber, and the ball joint upper stop ring
is disposed inside said ball joint seat and located at the upper
end of said ball joint seat, and the lower surface of said ball
joint seat abuts against a spherical surface of said rotating
part,.]. .[.the mutual contact surfaces of each of the ball joint
upper and lower stop rings and the rotating part are curved
surfaces.]. .Iadd.wherein the first ball joint stop ring engages
the rotating part and the second ball joint stop ring engages the
rotating part.Iaddend., wherein the locking stop member .[.is in
the form of.]. .Iadd.comprises .Iaddend.a flange formed by
extension of the end face of the ball joint seat toward .[.the.].
.Iadd.a .Iaddend.direction of .[.the.]. .Iadd.a .Iaddend.central
axis, .Iadd.wherein said flange comprises .Iaddend.an inner
diameter .[.of the flange is.]. .Iadd.being .Iaddend.smaller than a
diameter of the rotating part of the ball joint and .[.is.].
.Iadd.being .Iaddend.larger than a diameter of the connecting
part.
2. The ball joint orientation device of claim 1, wherein, recesses
are respectively formed at both end ports of .[.the.]. .Iadd.an
.Iaddend.inner wall of the orientation knob, and seal rings are
respectively disposed in said recesses.
.Iadd.3. A ball joint orientation device applicable to a monopod,
comprising a ball joint; stop members; a ball joint seat; and a
monopod body; wherein, one end of said ball joint comprises a
rotating part and is arranged in said ball joint seat in a
universal swaying manner, and the other end of said ball joint
extends to form a connecting part and is connected with said
monopod body; said stop members being arranged in said ball joint
seat, and said stop members comprising a locking stop member
located at one side of said rotating part, wherein said locking
stop member is a first ball joint stop member and disposed at one
end of said ball joint seat, and a surface of said ball joint seat
abutting against a spherical surface of said rotating part; said
stop members comprising a first stop member adapted for limiting a
position of the ball joint and located at a first side of said
rotating part, an upper surface of the first stop member abuts
against the rotating part, wherein said first stop member is a
second ball joint stop member disposed in the ball joint seat; an
orientation knob sleeved around the connecting part via a threaded
connection, and said orientation knob being transitioned towards or
away from said ball joint seat; wherein said orientation knob abuts
against an end face of said ball joint seat by moving towards said
ball joint seat, and, wherein said locking stop member locks said
ball joint to limit said ball joint from rotating; wherein said
orientation knob separates from said ball joint seat in response to
being transitioned away from said ball joint seat to release said
ball joint for rotating freely; wherein said monopod body and said
connecting part are connected together through a monopod body
joint, one end of said monopod body joint is sleeved around said
monopod body and in threaded connection with one end of said
monopod body, and the other end of said monopod body joint is
sleeved around said connecting part and in threaded connection with
said connecting part; and wherein the first ball joint stop member
engages the rotating part and the second ball joint stop member
engages the rotating part, wherein the locking stop member
comprises a flange formed by extension of the end face of the ball
joint seat toward a direction of a central axis, wherein said
flange comprises an inner diameter being smaller than a diameter of
the rotating part of the ball joint and being larger than a
diameter of the connecting part..Iaddend.
.Iadd.4. A ball joint orientation device applicable to a monopod
comprising a ball joint; stop members; a ball joint seat; and a
monopod body; wherein one end of said ball joint comprises a
rotating part and is disposed in said ball joint seat in a
universal swaying manner, and the other end of said ball joint
extends to form a connecting part; said stop members being disposed
in said ball joint seat, and said stop members comprising a locking
stop member disposed at one side of said rotating part, wherein
said locking stop member comprises a first ball joint stop ring and
disposed at one end of said ball joint seat, and wherein a surface
of said ball joint seat abutting against a spherical surface of
said rotating part; said stop members comprising a first stop
member adapted for limiting a position of the ball joint and
located at a first side of said rotating part, one surface of the
first stop member abuts against the rotating part, wherein said
first stop member is a second ball joint stop ring disposed in the
ball joint seat; an orientation knob sleeved around the connecting
part, in response to a force applied thereto, wherein said
orientation knob transitions toward or away from said ball joint
seat; wherein when one end of said orientation knob abuts against
an end face of said ball joint seat by moving towards said ball
joint seat, wherein said locking stop member locks said ball joint
to limit said ball joint from rotating; wherein said orientation
knob separates from said ball joint seat in response to another
force applied thereto to move away from said ball joint seat to
release said ball joint for rotating freely; wherein said monopod
body and said connecting part are connected together through a
monopod body joint, one end of said monopod body joint is in
threaded connection with one end of said monopod body, and the
other end of said monopod body joint is connected with said
connecting part; and wherein the first ball joint stop ring engages
the rotating part and the second ball joint stop ring engages the
rotating part, wherein the locking stop member comprises a flange
formed by extension of the end face of the ball joint seat toward a
direction of a central axis, wherein said flange comprises an inner
diameter being smaller than a diameter of the rotating part of the
ball joint and being larger than a diameter of the connecting
part..Iaddend.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
Pursuant to 35 U.S.C. .sctn.119 and the Paris Convention Treaty,
this application claims the benefit of Chinese Patent Application
No. 201310266409.3 filed on Jun. 28, 2013, the contents of which
are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a ball joint orientation device applicable
to photographic equipment, in particular to a ball joint
orientation device applicable to a unipod.
2. Background of the Invention
When video shooting is performed with photographic equipment, in
order to reduce shaking of the photographic equipment in shooting
and improve the video shooting quality, usually pods for faxing the
photographic equipment are used to assist shooting, and in order to
achieve all-direction shooting with the photographic equipment,
people generally will choose to use pods with 360-degree
rotation/swaying function; most pods implement 360-degree
rotation/swaying of the photographic equipment through configuring
ball joint rotation/swaying devices, the locking of which is
generally achieved by applying a pressure in the direction of a
sphere, while the unidirectional locking force is often not strong
enough to ensure firmness, and thus the locking effect is not
good.
To solve the above problem, a Chinese patent document CN201373969Y
discloses a ball joint locking structure of a photography head,
comprising a ball joint main body, a ball joint housing and a
support seat, wherein the support seat is located in the ball joint
housing; the ball joint main body is located between the support
seat and the ball joint housing; the support seat can move in the
axial direction of the ball joint housing under the action of an
adjusting knob; inside the ball joint main body, a washer is
sleeved on the ball joint main body, the inner surface of the
washer being adapted to the outer surface of the ball joint main
body, the washer being provided with a circle of recess outside,
and two side surfaces of the recess being outward inclined
surfaces; the ball joint housing is provided with a circle of bulge
therein, the bulge being adapted to the recess of the washer; in
the ball joint locking structure described in the above patent
document, through tightly screwing the adjusting knob, the support
seat bears an upward pressure, and in turn applies a pressure to
the ball joint main body, and the ball joint main body at the same
time applies a pressure to the washer; with the increase of the
pressure on the support seat, the locking force on the ball joint
main body also increases gradually; in the gradual increase process
of the locking force, the two inclined surfaces of the outer-ring
recess of the washer expand outward and deform, increasing the
force bearing area of the ball joint main body and the washer,
thereby increasing the locking force on the ball joint main body;
and in the ball joint locking structure, the ball joint main body
bears pressure simultaneously in the upper and lower directions,
and the locking effect is better.
The ball joint locking structure described in the above patent
document mainly has the following disadvantages: in the ball joint
locking structure, the ball joint main body is in contact with both
the washer and the support seat via its curved surface, and no
matter the ball joint main body is in a rotating state or locking
state, the lower end thereof is always in mutual contact with the
support seat, such that in the rotating process of the ball joint
main body, friction may occur between the lower end of the ball
joint main body and the support seat, and after a period of use,
the mutual contact curved surfaces thereof can be worn, so that the
surfaces in mutual contact tend to become not smooth, which in turn
results in that after the ball joint locking structure is locked,
the ball joint main body cannot fully fit the support seat,
clearances exist therebetween, and the locking is not firm, so that
the ball joint main body is likely to shake or incline at a certain
angle under the gravity action of a device connected to the upper
end of the ball joint main body and in the case of touch with an
external force, thereby affecting the photographing/shooting effect
of the photographic equipment or leading to inaccurate
photographing/shooting angle or poor reliability.
SUMMARY OF INVENTION
To this end, it is one technical problem of the invention that in
the ball joint locking structure of the prior art, mutual friction
between the ball joint and the locking component results in wear,
so that the locking is not firm, and further a firmly lockable ball
joint orientation device applicable to a unipod is provided.
In view of the above-described problem, it is one objective of the
invention to provide a ball joint orientation device applicable to
the unipod of the invention comprising a ball joint, stop members,
a ball joint seat, and a main rod, wherein, one end of the ball
joint is formed as a rotating part and is arranged in a ball joint
seat in a universal swaying manner, and the other end extends to
form a connecting part and is fixedly connected with a main rod;
the stop members are arranged in the ball joint seat, and the stop
members include a locking stop member located at an upper side of
the rotating part; said device further comprises an orientation
knob sleeved around the connecting part and/or the main rod, and
the orientation knob can be screwed towards or away from said ball
joint seat, so as to move upward or downward; the orientation knob
(3) abuts against an end face of said ball joint seat by being
screwed towards the ball joint seat, and, the locking stop member
locks the ball joint, so as to prevent the ball joint from
rotating; and the orientation knob becomes separated from the ball
joint seat by being screwed away from the ball joint seat, so as to
release the ball joint and allow the ball joint to rotate
freely.
In a class of this embodiment, the stop members further comprises a
lower stop member adapted for limiting the position of the ball
joint and located at a lower side of the rotating part, an upper
surface of the lower stop member abuts against the rotating
part.
In a class of this embodiment, the main rod is in threaded
connection with the connecting part, and the orientation knob is in
threaded connection with the main rod or the connecting part.
In a class of this embodiment, the main rod and the connecting part
are fixedly connected together through a main rod joint, one end of
the main rod joint is sleeved around the main rod and in threaded
connection with one end of the main rod, and the other end of the
main rod joint is sleeved around the connecting part and in
threaded connection with the connecting part.
In a class of this embodiment, the orientation knob is sleeved
around the main rod joint, and in threaded connection with the main
rod joint.
In a class of this embodiment, the lower stop member is a ball
joint lower stop ring made of plastic, and the ball joint lower
stop ring is fixedly disposed in the ball joint seat.
In a class of this embodiment, the locking stop member (21) is a
ball joint upper stop ring made of rubber, and the ball joint upper
stop ring is disposed inside the ball joint seat (5) and located at
the upper end of the ball joint seat (5), and the lower surface of
the ball joint seat (5) abuts against a spherical surface of the
rotating part (11).
In a class of this embodiment, the mutual contact surfaces of each
of the ball joint upper and lower stop rings and the rotating part
are curved surfaces.
In a class of this embodiment, recesses are respectively formed at
both end ports of the inner wall of the orientation knob, and seal
rings are respectively disposed in the recesses.
Advantages of the invention comprise:
(1) In the ball joint orientation device applicable to the unipod
of the invention, the locking of the ball joint is achieved by
mutual cooperation of the three components, the orientation knob,
the ball joint seat and the locking stop member, i.e., with the
abutting of the orientation knob against the ball joint seat, an
upward force is generated for the ball joint, so that the ball
joint and the locking stop member are coupled with each other,
thereby achieving the locking of the ball joint, and avoiding
mutual friction between the ball joint and a locking device, so as
to achieve a firm locking effect.
(2) In the ball joint orientation device applicable to the unipod
of the invention, recesses are respectively formed at both end
ports of the inner wall of the orientation knob, and seal rings are
respectively disposed in the recesses; so that the seal rings can
prevent sand or dust from entering the clearances between the
orientation knob and the main rod or the main rod joint, thereby
ensuring smooth rotation of the orientation knob during use.
(3) In the ball joint orientation device applicable to the unipod
of the invention, the stop members also include the lower stop
member located at the lower side of the rotating part, and the
lower stop member can limit the ball joint within a certain space
of the ball joint seat, and prevent the ball joint from sliding up
and down along the axial direction of the ball joint seat after the
ball joint is unlocked, so that the swaying of the ball joint in
the ball joint seat is more flexible and smooth.
(4) In the ball joint orientation device applicable to the unipod
of the invention, the ball joint upper stop ring and the ball joint
lower stop ring are made of plastic material, and the mutual
contact surfaces of each of the ball joint upper and lower stop
rings and the ball joint are curved surfaces, such that when being
locked, the ball joint can be in close fit with the ball joint
upper stop ring, and when being rotated, the ball joint can be in
close fit with the curved surface of the ball joint lower stop
ring, and can be smoothly rotated; and when the ball joint is
locked, the ball joint tightly fits to the ball joint upper stop
ring, the friction is relatively large, and the ball joint can not
rotate after being locked, so high locking reliability of the
orientation device can be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
Detailed description will be given below in conjunction with
accompanying drawings:
FIG. 1 is an exploded view of a ball joint orientation device of
the invention;
FIG. 2 is a structural schematic view of the ball joint orientation
device of the invention in its locked state;
FIG. 3 is a structural schematic view of the ball joint orientation
device of the invention in its unlocked state;
FIG. 4 is a structural schematic view of the ball joint positioning
device of the invention when it is used in combination with a
unipod;
Reference numerals in the figures are as follows: 1--ball joint;
11--rotating part; 12--connecting part; 21--locking stop member;
22--lower stop member; 3--orientation knob; 31--recess; 32--seal
ring; 4--main rod; 41--main rod joint; and 5--ball joint seat.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The invention will be further discussed below using the following
embodiments in conjunction with the drawings.
As shown in FIGS. 1-4, a ball joint orientation device applicable
to a unipod of one embodiment of the invention comprises a ball
joint 1, stop members, a ball joint seat 5, and a main rod 4,
wherein, one end of the ball joint 1 is formed as a rotating part
11 and is arranged in a ball joint seat 5 in a universal swaying
manner, and the other end extends to form a connecting part 12 and
is fixedly connected with a main rod 4; the stop members are
arranged in the ball joint seat 5, and the stop members comprise a
locking stop member 21 located at an upper side of the rotating
part 11; the device further comprises an orientation knob 3 sleeved
around the connecting part 12 and/or the main rod 4, and the
orientation knob 3 can be screwed towards or away from said ball
joint seat 5, so as to move upward or downward; the orientation
knob 3 is able to abut against an end face of the ball joint seat 5
by being screwed towards the ball joint seat 5, and, the locking
stop member 21 locks the ball joint 1, so as to prevent the ball
joint from rotating; and the orientation knob 3 becomes separated
from the ball joint seat 5 by being screwed away from the ball
joint seat 5, so as to release the ball joint 1 and allow the ball
joint to rotate freely. In the invention, the locking of the ball
joint 1 is achieved by mutual cooperation of the three components,
i.e., the orientation knob 3, the end face of the ball joint seat 5
and the locking stop member 21, i.e., with the abutting of the
orientation knob 3 against the ball joint seat 5, an upward pull
force is generated for the ball joint 1, so that the ball joint 1
and the locking stop member 21 are coupled with each other, thereby
achieving orienting locking of the ball joint 1, and avoiding
mutual friction between the ball joint 1 and a locking device, so
as to achieve a firm locking effect.
In the embodiment, the stop members may further comprise a lower
stop member 22 located at the lower side of the rotating part 11,
and the lower stop member 22 is able limit the ball joint 1 within
a certain space of the ball joint seat 5, and prevent the ball
joint 1 from sliding up and down along the axial direction of the
ball joint seat 5 after the ball joint is unlocked, so that the
swaying of the ball joint 1 in the ball joint seat 5 may be more
flexible and smooth.
In a preferred embodiment, the main rod 4 and the connecting part
12 are fixedly connected through a main rod joint 41, one end of
the main rod joint 41 being sleeved on the main rod 4 and in
threaded connection with an end of the main rod 4, and the other
end of the main rod joint 41 is sleeved around the connecting part
12 and in threaded connection with the connecting part 12. The
orientation knob 3 is sleeved around the main rod joint 41, and in
threaded connection with the main rod joint 41.
In an alternative embodiment, the main rod 4 is adapted for being
directly in threaded connection with the connecting part 12, and
the orientation knob 3 is adapted for being directly sleeved around
the main rod 4 or the connecting part 12 and in threaded connection
with the main rod 4 or the connecting part 12.
In the embodiment, recesses 31 are respectively formed at two end
ports of the inner wall of the orientation knob 3, and seal rings
32 are respectively disposed in the recesses 31; and the seal rings
32 is adapted for preventing sand or dust from entering the
clearances between the orientation knob 3 and the main rod 4 or
between the orientation knob 3 and the main rod joint 41, thereby
ensuring smooth rotation of the orientation knob 3 during use.
Further, in the embodiment, preferably the lower stop member 22 is
a ball joint lower stop ring made of plastic, and the ball joint
lower stop ring is fixedly disposed in ball joint seat 5, and the
upper surface thereof abuts against the spherical surface of the
rotating part 11; and the locking stop member 21 is a ball joint
upper stop ring made of rubber, and the ball joint upper stop ring
is disposed inside the ball joint seat 5 and located at the upper
end of the ball joint seat 5, and the lower surface of the ball
joint seat 5 abuts against a spherical surface of the rotating part
11.
In a preferred embodiment, the mutual contact surfaces of each of
the ball joint upper and lower stop ring and the rotating part 11
are curved surfaces, such that when being locked, the ball joint 1
can be in close fit with the ball joint upper stop ring, and the
locking is firm, and at the same time, when being rotated, the ball
joint 1 can be in fit with the curved surface of the ball joint
lower stop ring, and can rotate smoothly.
In an alternative embodiment of the locking stop member 21, the
locking stop member 21 can also be designed in the form of a
flange, which is formed by extension of an end face of the ball
joint seat 5 toward the direction of the central axis, the inner
diameter of the flange may be smaller than the diameter of the
rotating part 11 of the ball joint 1 and larger than the diameter
of the connecting part 12.
While particular embodiments of the invention have been shown and
described, it will be obvious to those skilled in the art that
changes and modifications may be made without departing from the
invention in its broader aspects, and therefore, the aim in the
appended claims is to cover all such changes and modifications as
fall within the true spirit and scope of the invention.
* * * * *
References