U.S. patent application number 13/592215 was filed with the patent office on 2013-04-18 for retractable gripping apparatus for walking assistance devices.
The applicant listed for this patent is MICHAEL A. BARBONE. Invention is credited to MICHAEL A. BARBONE.
Application Number | 20130092201 13/592215 |
Document ID | / |
Family ID | 48085151 |
Filed Date | 2013-04-18 |
United States Patent
Application |
20130092201 |
Kind Code |
A1 |
BARBONE; MICHAEL A. |
April 18, 2013 |
RETRACTABLE GRIPPING APPARATUS FOR WALKING ASSISTANCE DEVICES
Abstract
A safety device provides a retractable gripping device for use
in conjunction with walking assistance devices such that a user may
safely navigate on slippery surfaces. An activating mechanism is
provided for user convenience. A locking mechanism moves into a
locked position. To deactivate the gripping device, the user again
activates a deactivating device to return the gripping device back
to its retracted, deactivated position. The gripping device is
configured such that it may be used in conjunction with existing
walking assistance devices. The retractable gripping mechanism and
locking device are preferably controlled by the user with minimal
effort, with the control mechanism positioned at or near where the
users hands are positioned during use.
Inventors: |
BARBONE; MICHAEL A.;
(Belleville, NJ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BARBONE; MICHAEL A. |
Belleville |
NJ |
US |
|
|
Family ID: |
48085151 |
Appl. No.: |
13/592215 |
Filed: |
August 22, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61526924 |
Aug 24, 2011 |
|
|
|
61637667 |
Apr 24, 2012 |
|
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Current U.S.
Class: |
135/66 |
Current CPC
Class: |
A45B 3/00 20130101; A45B
9/04 20130101; A61H 3/04 20130101; A61H 3/02 20130101; A61H 3/0288
20130101 |
Class at
Publication: |
135/66 |
International
Class: |
A45B 3/00 20060101
A45B003/00 |
Claims
1. An apparatus for a retractable gripping device for use with a
walking assistance device, said apparatus comprising: a shaft that
is made of a rigid material, said shaft having an upper and lower
end, wherein said lower end has a tip positioned thereon; a control
knob positioned at the upper end of said shaft; a gripping means
positioned at the lower end of said shaft; a rod position
longitudinally within said shaft, said rod connecting said knob and
said gripping means for providing a gripping action to a surface on
which the walking assistance device is used; and a locking
mechanism positioned on said rod between said upper and lower ends
of said shaft such that when in a locked position said locking
mechanism holds said gripping means in position extending through
said tip; wherein said gripping means comprises a rigid anti-slip
surface, and wherein said locking mechanism is activated by
exerting a downward force on said control knob and then rotating
said control knob.
2. The apparatus of claim 1, wherein a longitudinal position of
said locking mechanism is controlled by at least one spring,
wherein said spring exerts an upward force on said rod.
3. The apparatus of claim 1, wherein said spring is positioned
substantially near said locking mechanism.
4. The apparatus of claim 1, wherein said spring is positioned
substantially near said control knob.
5. The apparatus of claim 1, wherein said spring is positioned
substantially near said tip.
6. The apparatus of claim 1, wherein said rod is supported within
said shaft on the upper end by a press fit bushing.
7. The apparatus of claim 1, wherein said control knob is selected
from the group consisting of a knurled knob and a handle.
8. The apparatus of claim 1, wherein said walking assistance device
is selected from the group consisting of a forearm crutch, an
underarm crutch, a platform crutch, a strutter crutch, a cane, a
walking stick, and a walker.
9. The apparatus of claim 8, wherein said crutch comprises: at
least two generally straight upper tubes positioned substantially
parallel to each other; a shoulder pad fabricated of elastomeric
material positioned at the top of each of the two tubes thereby
connecting them in a substantially parallel configuration; and a
hand grip fabricated of elastomeric material and includes an axial
aperture extending there through and is positioned between the two
tubes; wherein said retractable gripping device is positioned
longitudinally between and secured to a lower end of said straight
upper tubes such that said control knob is located near said hand
grip and said tip is located at the lower end of said crutch.
10. The apparatus of claim 9, wherein a vertical position of said
retractable gripping device is adjusted by engaging to at least one
pair of matching holes on the two upper tubes.
11. An apparatus for a retractable gripping device for use with a
walking assistance device, said apparatus comprising: a shaft that
is made of a rigid material, said shaft having an upper and lower
end, wherein said lower end has a tip positioned thereon; a control
knob positioned at the upper end of said shaft; a gripping means
positioned at the lower end of said shaft; a rod having a
longitudinal bore therethrough, said rod being positioned
longitudinally within said shaft, said rod connecting said knob and
said gripping means for providing a gripping action to a surface on
which the walking assistance device is used; a fluid chamber
containing a fluid; and a compression chamber formed within a lower
end of said shaft by first and second bushings within said shaft
having lateral seal therein; wherein said gripping means comprises
a rigid anti-slip surface, and wherein upon activation of said
control knob said fluid is forced from said fluid chamber through
said rod into said compression chamber to exert downward force on
said second bushing to force movement of said gripping means
through a bottom end of said shaft.
12. The apparatus of claim 11, wherein said apparatus further
comprises a spring positioned substantially near said second to
exert upward force upon said second bushing to retract said
gripping means.
13. The apparatus of claim 11, wherein said rod is supported within
said shaft on the upper end by a press fit bushing.
14. The apparatus of claim 11, wherein said control knob is
selected from the group consisting of a knurled knob and a
handle.
15. The apparatus of claim 11, wherein said walking assistance
device is selected from the group consisting of a forearm crutch,
an underarm crutch, a platform crutch, a strutter crutch, a cane, a
walking stick, and a walker.
16. The apparatus of claim 15, wherein said crutch comprises: at
least two generally straight upper tubes positioned substantially
parallel to each other; a shoulder pad fabricated of elastomeric
material positioned at the top of each of the two tubes thereby
connecting them in a substantially parallel configuration; and a
hand grip fabricated of elastomeric material and includes an axial
aperture extending there through and is positioned between the two
tubes; wherein said retractable gripping device is positioned
longitudinally between and secured to a lower end of said straight
upper tubes such that said control knob is located near said hand
grip and said tip is located at the lower end of said crutch.
17. An apparatus for a retractable gripping device for use with a
walking assistance device, said apparatus comprising: a shaft that
is made of a rigid material, said shaft having an upper and lower
end, wherein said lower end has a tip positioned thereon; a control
knob positioned at the upper end of said shaft; a gripping means
positioned at the lower end of said shaft; a rod position
longitudinally within said shaft, said rod connecting said knob and
said gripping means for providing a gripping action to a surface on
which the walking assistance device is used; and a locking
mechanism positioned on said rod between said upper and lower ends
of said shaft such that when in a locked position said locking
mechanism holds said gripping means in position extending through
said tip, said locking mechanism comprising interlocking pits and
teeth; wherein said gripping means comprises a rigid anti-slip
surface, wherein said locking mechanism is activated by exerting a
first downward force on said control knob, and wherein said locking
mechanism is deactivated by exerting a second downward force on
said control knob.
18. The apparatus of claim 17, wherein a longitudinal position of
said locking mechanism is controlled by at least one spring,
wherein said spring exerts an upward force on said rod.
19. The apparatus of claim 17, wherein said spring is positioned
substantially near said locking mechanism.
20. The apparatus of claim 17, wherein said spring is positioned
substantially near said tip.
21. The apparatus of claim 17, wherein said rod is supported within
said shaft on the upper end by a press fit bushing.
22. The apparatus of claim 17, wherein said control knob is
selected from the group consisting of a knurled knob and a
handle.
23. The apparatus of claim 17, wherein said walking assistance
device is selected from the group consisting of a forearm crutch,
an underarm crutch, a platform crutch, a strutter crutch, a cane, a
walking stick, and a walker.
24. The apparatus of claim 23, wherein said crutch comprises: at
least two generally straight upper tubes positioned substantially
parallel to each other; a shoulder pad fabricated of elastomeric
material positioned at the top of each of the two tubes thereby
connecting them in a substantially parallel configuration; and a
hand grip fabricated of elastomeric material and includes an axial
aperture extending there through and is positioned between the two
tubes; wherein said retractable gripping device is positioned
longitudinally between and secured to a lower end of said straight
upper tubes such that said control knob is located near said hand
grip and said tip is located at the lower end of said crutch.
25. The apparatus of claim 23, wherein a vertical position of said
retractable gripping device is adjusted by engaging to at least one
pair of matching holes on the two upper tubes.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application relates to and claims priority from U.S.
Provisional Patent Application Ser. No. 61/526,924 filed Aug. 24,
2011 and U.S. Provisional Patent Application Ser. No. 61/637,667
filed Mar. 24, 2012, the entire contents of each of which are
incorporated herein fully by reference.
FIGURE FOR PUBLICATION
[0002] FIG. 9A
BACKGROUND OF THE INVENTION
[0003] 1. Field of the Invention
[0004] The present invention relates to a safety apparatus and
method for preventing slipping of walking assistance devices such
as crutches, canes, walkers, and/or other similar walking support
devices. More particularly, the present invention provides a
retractable gripping device for use in conjunction with a walking
assistance device such that a user may safely navigate on wet, icy
or otherwise slippery surfaces. A corresponding method of
preventing slipping of a walking support device is also
provided.
[0005] 2. Description of the Related Art
[0006] Walking assistance devices, such as crutches, canes,
walkers, and other similar devices have been used for years by
various people needing assistance walking and/or other physical
support. A user of these walking assistance devices faces his or
her greatest challenge when walking on wet, icy, or otherwise
slippery surfaces. During use of such a device it is important that
the support provided by the device is steady so that the user can
safely navigate on the device without risk of injury, especially
when the walking assistance device is used on wet, icy, or
otherwise slippery surfaces because such surfaces may cause the tip
of the walking assistance devices to slip (e.g., to the front, to
the back, or to the side) causing the user to lose balance and fall
possibly leading to injury.
[0007] With regard to the configuration of the tips for such
walking assistance devices, the prior art discloses friction based
tips having a lower surface or tread piece which is divided or
separated into a plurality of segments, each of which has an edge
or portion thereof to provide a separate frictional engagement with
the ground or other supporting surface when the tip is flexed. The
related art also discloses tips having a screw-in-type receiver for
the shaft of the walking assistance device (small spike). The lower
surface of the tread piece includes a plurality of downwardly or
outwardly depending projections or fingers for receiving and
flexing about small articles while maintaining traction with the
ground or other supporting surface. Moreover, typical prior art
tips are made of natural rubber because they provide superior
performance on a variety of surfaces. However, such natural rubber
tips typically provide insufficient traction on smooth wet or
otherwise slippery surfaces.
[0008] Over the years, many different types of tips to be employed
on the bottom of crutches, canes, walkers and the like, have been
provided in an attempt to help prevent slipping on wet, icy or
otherwise slippery surfaces. One such known configuration consists
of a base, an upholding pole, and a mantle. At the top of the base,
there is a cavity for engaging with the ball-shaped end piece at
the end of the upholding pole. The end piece will then be able to
adjust to follow the lay of surface by changing its supporting
angle moderately and thus minimize the risk of slipping. As another
attempt at a solution to this problem, the prior art also discloses
inserting one or more disks or strips of non-skid material, such as
a metal wire brush, into a rubber tip tread piece in order to
improve traction on wet surfaces. Still other attempts to solve
this problem included use of various materials to replace the
rubber tip. However, natural rubber has an advantage on
substantially dry or substantially rough surfaces in that it
sloughs off its surface layer when abraded with each step and
presents a clean, tacky surface to the supporting surface, in the
nature of a rubber pencil eraser. Other material did not prove to
be suitable replacements for natural rubber. However, none of the
known tips have adequately alleviated this slipping problem.
[0009] Accordingly, there is a need for an improved crutch, cane,
walker or other walking assistance device that provides added
safety to users on icy or other slippery surfaces. Further, there
is also a need for such an improved crutch that has an easy to use
retractable gripping device that a user can activate and deactivate
during use of the crutch, cane, walker or other walking assistance
device.
SUMMARY AND ASPECTS OF THE INVENTION
[0010] The invention relates to a safety device for use with
walking assistance devices such as crutches, canes, walkers and the
like. More particularly, the present invention provides a
retractable gripping device for use in conjunction with a walking
assistance device such that a user may safely navigate on slippery
or icy surfaces. In a preferred embodiment, to activate the
gripping device, the user of the crutch must push the activating
knob down and turn it in the clockwise direction such that locking
mechanism moves into the locked position. To deactivate the
gripping device, the user again pushes down the knob and turns it
in a counter-clockwise direction such that a spring internal to the
lower leg portion of the crutch will return the gripping device
back to its retracted, deactivated position. Preferably, the
gripping device is configured such that it may be used in
conjunction with existing walking assistance devices, with only
minor adjustments or modifications without altering the basic
design of the walking assistance device. Also, the retractable
gripping mechanism and locking device are preferably controlled
(i.e., activated or deactivated) by the user with minimal effort,
with the control mechanism preferably positioned at or proximate
near where the users hands are conveniently positioned on the
walking assistance device.
[0011] In a preferred embodiment of the present invention,
disclosed is an apparatus for a retractable gripping device for use
with a walking assistance device (e.g., forearm crutch, an underarm
crutch, a platform crutch, a strutter crutch, a cane, a walking
stick, a walker, etc.), wherein the apparatus comprises a shaft
that is made of a rigid material, the shaft having an upper and
lower end, wherein the lower end has a tip positioned thereon, a
control or activating knob or handle (e.g., a round knob, a knurled
knob, an oval knob, a triangular knob, a straight handle, a curved
handle, etc.) positioned at the upper end of the shaft, a gripping
mechanism positioned at the lower end of the shaft, a rod position
longitudinally within the shaft, the rod connecting the knob and
the gripping mechanism for providing a gripping action to a surface
on which the walking assistance device is used, and a locking
mechanism positioned on the rod between the upper and lower ends of
the shaft such that when in a locked position the locking mechanism
holds the gripping means in position extending through the tip,
wherein the gripping mechanism comprises a rigid anti-slip surface,
and wherein the locking mechanism is activated by exerting a
downward force on the control knob and then rotating the control
knob.
[0012] Optionally, the longitudinal position of the locking
mechanism is controlled by at least one spring, wherein the spring
exerts an upward force on the rod. In such an embodiment, the
spring is positioned substantially near the locking mechanism,
and/or substantially near said control knob, and/or substantially
near said tip. Preferably, the rod is supported within the shaft on
the upper end by a press fit bushing. In the embodiment for use
with a crutch, the crutch preferably comprises at least two
generally straight upper tubes or legs positioned substantially
parallel to each other, a shoulder pad, preferably fabricated of
elastomeric material, positioned at the top of each of the two
tubes thereby connecting them in a substantially parallel
configuration, and a hand grip, preferably fabricated of
elastomeric material and including an axial aperture extending
there through, positioned between the two tubes. In such an
embodiment, the retractable gripping device is positioned
longitudinally between and secured to a lower end of the straight
upper legs or tubes such that the control knob or handle is located
near the hand grip and the tip is located at the lowest end of the
crutch. Optionally, the vertical position of the retractable
gripping device is adjustable by engaging to at least one pair of
matching holes on the two upper legs or tubes.
[0013] It is therefore an object of the present invention to
provide a retractable gripping device for use in conjunction with a
crutch such that a user may safely navigate on wet, icy or
otherwise slippery surfaces.
[0014] It is an object of the present invention to provide a
retractable gripping device that is adaptable for use in
conjunction with existing crutches, with only minor adjustments or
modifications without altering the basic design of the crutches,
such that a user may safely navigate on wet, icy or otherwise
slippery surfaces.
[0015] It is an object of the present invention to provide a
retractable gripping device for use in conjunction with a crutch
such that the retractable gripping mechanism and locking device may
be controlled or activated by the user with minimal effort, as well
as be easily controlled or deactivated in a similar manner. In such
an embodiment, the activating mechanism is preferably positioned
such that the user may control or activate it while continuing to
utilize the crutches (e.g., without having to turn over the
crutches).
[0016] It is an object of the present invention to provide a
retractable gripping device that is adaptable for use as a
replacement kit for use in conjunction with existing canes,
walkers, and other walking assistance devices.
[0017] It is an object of the present invention to provide a
retractable gripping device having a locking device, for example,
like a twist and pivot mechanism or an indexed pressure
(pen-type)-click mechanism.
[0018] The above and other aspects, features and advantages of the
present invention will become apparent from the following
description read in conjunction with the accompanying drawings, in
which like reference numerals designate the same elements.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] A further understanding of the present invention can be
obtained by reference to a preferred embodiment set forth in the
illustrations of the accompanying drawings. Although the
illustrated preferred embodiment is merely exemplary of methods,
structures and compositions for carrying out the present invention,
both the organization and method of the invention, in general,
together with further objectives and advantages thereof, may be
more easily understood by reference to the drawings and the
following description. The drawings are not intended to limit the
scope of this invention, which is set forth with particularity in
the claims as appended or as subsequently amended, but merely to
clarify and exemplify the invention.
[0020] For a more complete understanding of the present invention,
reference is now made to the following drawings in which:
[0021] FIG. 1A shows a front plan view of conventional walking
crutch;
[0022] FIG. 1B shows a front plan view of a walking crutch having a
retractable gripping device in accordance with a preferred
embodiment of the invention;
[0023] FIG. 2A shows a front plan view of the walking crutch shown
in FIG. 1B having a retractable gripping device with the
retractable gripping device in the retracted or deactivated
position;
[0024] FIG. 2B shows a front plan view of the walking crutch shown
in FIG. 1B having a retractable gripping device with the
retractable gripping device in the extended or activated
position;
[0025] FIG. 2C shows an enlarged view of the lower end of the
walking crutch shown in FIG. 2A;
[0026] FIG. 2D shows an enlarged view of the lower end of the
walking crutch shown in FIG. 2B;
[0027] FIG. 3A shows an exposed front plan view of the walking
crutch shown in FIG. 1B having a retractable gripping device with
the retractable gripping device in the retracted or deactivated
position, and further showing the internal components of the
retractable gripping device in accordance with a preferred
embodiment of the invention;
[0028] FIG. 3B shows an exposed front plan view of the walking
crutch shown in FIG. 1B having a retractable gripping device with
the retractable gripping device in the extended or activated
position, and further showing the internal components of the
retractable gripping device in accordance with a preferred
embodiment of the invention;
[0029] FIG. 3C shows an enlarged view of the upper end of the
retractable gripping device shown in FIG. 3B;
[0030] FIG. 3D shows an enlarged view of the lower end of the
retractable gripping device shown in FIG. 3B;
[0031] FIG. 4A shows a side view of conventional walker;
[0032] FIG. 4B shows a side view of a walker having a retractable
gripping device in accordance with a preferred embodiment of the
invention;
[0033] FIG. 5A shows a side view of the walker shown in FIG. 4B
having a retractable gripping device with the retractable gripping
device in the retracted or deactivated position;
[0034] FIG. 5B shows a side view of the walker shown in FIG. 4B
having a retractable gripping device with the retractable gripping
device in the extended or activated position;
[0035] FIG. 5C shows an enlarged view of the lower end of one leg
of the walker shown in FIG. 5A;
[0036] FIG. 5D shows an enlarged view of the lower end of one leg
of the walker shown in FIG. 5B;
[0037] FIG. 6A shows an exposed partial side view of the walker
shown in FIG. 4B having a retractable gripping device with the
retractable gripping device in the retracted or deactivated
position, and further showing the internal components of the
retractable gripping device in accordance with a preferred
embodiment of the invention;
[0038] FIG. 6B shows an exposed partial side view of the walker
shown in FIG. 4B having a retractable gripping device with the
retractable gripping device in the extended or activated position,
and further showing the internal components of the retractable
gripping device in accordance with a preferred embodiment of the
invention;
[0039] FIG. 6C shows an enlarged view of the upper end of the
retractable gripping device shown in FIG. 6B;
[0040] FIG. 6D shows an enlarged view of the lower end of the
retractable gripping device shown in FIG. 6B;
[0041] FIG. 7A shows an exposed front plan view of an alternative
embodiment of the walking crutch shown in FIG. 1B having a
retractable gripping device with the retractable gripping device in
the retracted or deactivated position, and further showing the
internal components of the retractable gripping device in
accordance with the alternative embodiment of the invention;
[0042] FIG. 7B shows an exposed front plan view of the walking
crutch shown in FIG. 7A having a retractable gripping device with
the retractable gripping device in the extended or activated
position, and further showing the internal components of the
retractable gripping device in accordance with the alternative
embodiment of the invention;
[0043] FIG. 7C shows an enlarged view of the upper end of the
retractable gripping device shown in FIG. 7B;
[0044] FIG. 7D shows an enlarged view of the lower end of the
retractable gripping device shown in FIG. 7B;
[0045] FIG. 8A shows an exposed partial side view of an alternative
embodiment of the walker shown in FIG. 4B having a retractable
gripping device with the retractable gripping device in the
retracted or deactivated position, and further showing the internal
components of the retractable gripping device in accordance with
the alternative embodiment of the invention;
[0046] FIG. 8B shows an exposed partial side view of the walker
shown in FIG. 8A having a retractable gripping device with the
retractable gripping device in the extended or activated position,
and further showing the internal components of the retractable
gripping device in accordance with the alternative embodiment of
the invention;
[0047] FIG. 8C shows an enlarged view of the upper end of the
retractable gripping device shown in FIG. 8B;
[0048] FIG. 8D shows an enlarged view of the lower end of the
retractable gripping device shown in FIG. 8B;
[0049] FIG. 9A shows an exposed front plan view of a second
alternative embodiment of the walking crutch shown in FIG. 1B
having a retractable gripping device with the retractable gripping
device in the retracted or deactivated position, and further
showing the internal components of the retractable gripping device
in accordance with the second alternative embodiment of the
invention;
[0050] FIG. 9B shows an exposed front plan view of the walking
crutch shown in FIG. 9A having a retractable gripping device with
the retractable gripping device in the extended or activated
position, and further showing the internal components of the
retractable gripping device in accordance with the second
alternative embodiment of the invention;
[0051] FIG. 9C shows an enlarged view of the upper end of the
retractable gripping device shown in FIG. 9B;
[0052] FIG. 9D shows an enlarged view of the lower end of the
retractable gripping device shown in FIG. 9B;
[0053] FIG. 10A shows a partial exposed side view of the walker
shown in FIG. 5A having an alternative embodiment of the
retractable gripping device with the retractable gripping device in
the retracted or deactivated position;
[0054] FIG. 10B shows a partial exposed side view of the walker
shown in FIG. 10A having an alternative embodiment of the
retractable gripping device with the retractable gripping device in
the extended or activated position;
[0055] FIG. 10C shows an enlarged view of the upper end of the
retractable gripping device shown in FIG. 10B;
[0056] FIG. 10D shows an enlarged view of the lower end of one leg
of the walker shown in FIG. 10B; and
[0057] FIG. 11 shows an exposed side view of the walker shown in
FIG. 4B having an alternative embodiment of the retractable
gripping device with the retractable gripping device in the
extended or activated position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0058] As required, a detailed illustrative embodiment of the
present invention is disclosed herein. However, techniques,
systems, compositions and operating structures in accordance with
the present invention may be embodied in a wide variety of sizes,
shapes, forms and modes, some of which may be quite different from
those in the disclosed embodiment. Consequently, the specific
structural and functional details disclosed herein are merely
representative, yet in that regard, they are deemed to afford the
best embodiment for purposes of disclosure and to provide a basis
for the claims herein which define the scope of the present
invention.
[0059] Reference will now be made in detail to several embodiments
of the invention that are illustrated in the accompanying drawings.
Wherever possible, same or similar reference numerals are used in
the drawings and the description to refer to the same or like parts
or steps. The drawings are in simplified form and are not to
precise scale. For purposes of convenience and clarity only,
directional terms, such as top, bottom, up, down, over, above,
below, etc., or motional terms, such as forward, back, sideways,
transverse, etc. may be used with respect to the drawings. These
and similar directional terms should not be construed to limit the
scope of the invention in any manner.
[0060] Referring first to FIG. 1, shown is a comparison of a
standard crutch compared to the new gripping crutch for slippery
conditions. FIG. 1A shows the standard crutch. The standard crutch
2 typically has an upper shaft made of two tubes or stems. A hand
grip 6 of the crutch 2 is positioned generally in the center of the
length of the crutch 2, and is preferably adjustable like many
other conventional crutches. The standard crutch 2 also comprises
lower shaft 8 preferably comprised of one aluminum tube that
constitutes a leg part of the crutch 2, and extended from the upper
shaft toward to ground surface. Preferably, the position of the
lower shaft 8 with respect to the upper shaft is adjustable. An
armrest 4 at the top of the crutch 2 is preferably fabricated with
elastomeric material, the armrest 4 having a slightly indented
upper surface. A hand grip (3) fabricated of elastomeric material
and including an axial aperture extending there through. The hand
grip being positioned between the two upper tubes of crutch 2. The
vertical position of the hand grip 6 may be adjusted by engaging
the hand grip 6 to one pair of matching holes on the two upper
tubes at the same vertical level. At the lower end of lower tube 8
there is preferably a tip 10 positioned on the end of the lower
tube 8. Tip 10 is typically made of a rubber-like material for
engagement on typical surfaces, such as tile, marble, wood,
pavement, cement, etc.
[0061] In accordance with the present invention, lower tube or
shaft 8 of a standard crutch 2 is replaced with a retractable
gripping device 18 as shown in FIG. 1B. Here, shown is a crutch 12
that incorporates the retractable gripping device 18 according to
the invention. Preferably, retractable gripping device 18 comprises
a shaft 26 that is made of a rigid material, having an upper and
lower end, a control knob 28 positioned at the upper end of the
shaft 26, a gripping means 22 positioned at the lower end of the
shaft 26, a rod 27 position longitudinally within the shaft 26
connecting the knob 28 and the gripping means 22 for providing a
gripping action to a surface on which the crutch is used, and a
locking mechanism 24 positioned on the rod 27 at a location between
the knob 28 and the gripping means 22 such that when in a locked
position the locking mechanism 24 holds the gripping means 22 in
position extending through the tip 20. During operation, the
locking mechanism 24 is activated by the user exerting a downward
force on the control knob 28 and then rotating the control knob in
either a clockwise or counter-clockwise direction. Also, as shown,
the modifications are made at the lower end of the upper portion of
crutch 12. That is, the lower portion of a standard crutch is
replaced with a new lower portion having the retractable gripping
device 26. Also, the lower portion is preferably extended upward
toward the hand grip 16 used by the user such that adjustment of
the retractable gripping device 26 is easily controlled by the user
wile he/she is using the crutch 12. Preferably, incorporation of
the lower leg having the retractable gripping device 26 does not
alter the height adjustability of the crutch 12.
[0062] Referring next to FIG. 2A, depicted is the crutch 12 in
accordance with the preferred embodiment of the present invention
as shown in FIG. 1B, with the gripping device 26 deactivated and in
its retracted position. In FIG. 2A, shown is a front plan view of
the walking crutch 12 having a retractable gripping device 26. As
depicted more clearly in FIG. 2C, an enlarged view of the lower end
of the walking crutch 12 shown in FIG. 2A, pin or screw type
locking mechanism 25 is in the raised and retracted position within
bored opening 37. In this position, the gripping mechanism 22 is in
a retracted position such that it does not extend or protrude
through the bottom of tip 20. To activate the retractable gripping
device 26, the user of the crutch 12 must push the activating knob
28 down (which may be any convenient shape or size to provide easy
access to and activation of the knob) such that the locking
mechanism 25 moves to the lower end of bored opening 37. Once in
that position, the user need only turn knob 28 in a clockwise
direction until locking mechanism 25 moves into a lower locked
position within bored opening 37.
[0063] To deactivate the gripping device, the user must again push
down the knob and turn it in a counter-clockwise direction such
that a spring internal to the lower leg portion of the crutch will
return the gripping device back to its retracted, deactivated
position. As shown, when not activated a retaining spring maintains
the gripping device in the retracted, deactivated upward position.
Also as shown, when the gripping device is activated in the
extended position, the spring is compressed. When the knob is
turned clockwise, the spring will hold the gripping device in the
locked position. All downward pressure applied to the gripping
device will maintain it in the locked position in conjunction with
the spring.
[0064] Turning to FIG. 2B, depicted is the crutch 12 shown in FIG.
1B, with the gripping device 26 activated and in its extended
position. As depicted more clearly in FIG. 2D, an enlarged view of
the lower end of the walking crutch 12 shown in FIG. 2B, pin or
screw type locking mechanism 25 is in the activated and in its
extended position within bored opening 37 such that gripping
mechanism or surface 22 is protruding through the bottom of tip 20.
To deactivate the gripping device 26, the user must again push down
the knob 28 and turn it in a counter-clockwise direction such that
a spring 34 (FIG. 3A-D) internal to the lower leg portion of the
crutch 12 will return the gripping device 26 back to its retracted,
deactivated position. As shown in FIG. 3A, when not activated a
retaining spring 34 maintains the gripping device 26 in the
retracted, deactivated upward position. As shown in FIGS. 3B-C,
when the gripping device 26 is activated in the extended position,
the spring 34 is compressed. When the knob 28 is turned clockwise,
the spring 34 will hold the gripping device 26 in the locked
position. All downward pressure applied to the gripping device 26
will maintain it in the locked position in conjunction with the
spring 34.
[0065] More particularly, FIGS. 3A-C show the internal components
of the retractable gripping device 26 in accordance with a
preferred embodiment of the invention. In particular, gripping
device 26 preferably comprises knob or handle 28, shaft or tube 18
having openings at either end as well a bored opening 37, rod 32,
locking mechanism 25, gripping surface or mechanism 22, and foot
20. Optionally, a spring 34, and bushings 30 and 36 may be
employed. Spring 34 may optionally be positioned below the locking
mechanism 25 such that the spring 34 would exert an upward force on
the rod 32 to maintain the gripping device 26 in either the
activated or deactivated position depending on the position of
control knob 28 and locking mechanism 25. Alternatively, the spring
may be located at or near the top of gripping device 26. Similarly,
spring 34 would exert an upward force on the rod 32 at or near the
control knob 28 to maintain the gripping device 26 in either the
activated or deactivated position depending on the position of
control knob 28 and locking mechanism 25. Also, in an alternative
embodiment of the invention, rod 32 and gripping mechanism 22 may
be constructed as a single integrated component, unlike the two
separate components as in the preferred embodiment.
[0066] As shown in FIGS. 1-3, the retractable gripping device 26 is
preferably configured as a twist-and-pivot retractable locking
system. As described above in greater detail, the twist and pivot
retractable gripping device is activated (i.e., extended) or
deactivated (i.e., retracted) by pushing down on the control knob
28 and twisting the control knob 28 to further twist the locking
mechanism 25 such that it pivots and locks into either the
activated or deactivated position. In an alternative embodiment, a
click pen type retractable system may be used such that the user
merely has to press down on control knob 28 to activate the
gripping mechanism 22, and then press down on knob 28 again to
deactivate the gripping mechanism 22.
[0067] Turning next to FIGS. 4-6, depicted is another type of
walking assistance device for which the present invention may be
used. FIG. 1A depicts a conventional walker 40 which consists of a
series of interconnected tubes, bars, pipes or rods to form a frame
that a user can easily and safely use to support a good portion of
his/her weight while attempting to walk around. Typically, such
conventional walkers are configured to have four legs whose lower
ends are configured to interact with the ground surface. As shown
in FIG. 1A, one such convention walker includes wheels 44 on two
legs, and feet 42 on the other two legs. Other embodiments exist
where all four legs have wheels 44 on their lower ends, or all four
legs have feet 42 on their lower ends.
[0068] Preferably, the retractable gripping device according to the
present invention may be employed in the legs of a conventional
walker that employs feet on the bottom ends of at least some of its
legs, as depicted in FIGS. 4B, 5A-D and 6A-D. In particular, FIGS.
5A-B show side views of a walker 50 employing a retractable
gripping device in accordance with a preferred embodiment of the
invention. Referring to FIG. 5A, depicted is the walker 50 in
accordance with an embodiment of the present invention, with the
gripping device 46 deactivated and in its retracted position. As
depicted more clearly in FIG. 5C, an enlarged view of the lower end
of a leg from the walker 50 shown in FIG. 5A, a pin or screw type
locking mechanism 47 is in the raised and retracted position within
a bored opening. In this position, the gripping mechanism 46 (FIGS.
5B and 5D) is in a retracted position such that it does not extend
or protrude through the bottom of tip 42. To activate the
retractable gripping device, the user of the walker 50 must push
the activating knob 28 down (which may be any convenient shape or
size to provide easy access to and activation of the knob) such
that the locking mechanism 47 moves to the lower end of bored
opening 37. Once in that position, the user need only slide, turn
or rotate knob 52 in a clockwise direction until locking mechanism
47 moves into a lower locked position within a bored opening, as
depicted in FIGS. 5B and 5D.
[0069] To deactivate the gripping device 46, the user must again
push down the knob 52 and slide, turn or rotate it in a
counter-clockwise direction such that a spring internal to the
lower leg portion of the walker will return the gripping device 46
back to its retracted, deactivated position. As shown in FIGS.
6A-D, when not activated, a retaining spring 64 maintains the
gripping device 46 in the retracted, deactivated and upward
position (see FIG. 6A). Also as shown, when the gripping device 46
is activated and in the extended position, the spring 64 is
compressed. When the knob 52 is rotated clockwise, the spring 64
will hold the gripping device 46 in the locked and activated
position. All downward pressure applied to the gripping device 46
will maintain it in the locked position in conjunction with the
spring 64.
[0070] More particularly, FIGS. 6A-C depict the internal components
of the retractable gripping device in accordance with a preferred
embodiment of the invention. In particular, gripping device
preferably comprises knob, lever, pin or handle 52, rod or stem 58,
locking mechanism 48, gripping surface or mechanism 46, and foot
42. Of course, in this embodiment, the legs of walker 50 would
preferably contain bored openings 56 and 60 for the control knob 52
and locking mechanism 48, respectively, to pass through to the rod
58 that is positioned longitudinally within the legs of walker 50.
Optionally, a spring 64, and bushings 54 and 62 may be employed.
Spring 64 may optionally be positioned below the locking mechanism
48 such that the spring 64 would exert an upward force on the rod
58 to maintain the gripping device 46 in either the activated or
deactivated position depending on the position of control knob,
lever, pin or handle 52 and locking mechanism 48. Alternatively,
the spring 64 may be located near control knob, lever, pin or
handle 52. In this configuration, spring 64 would similarly exert
an upward force on the rod 58 at or near the control knob, lever,
pin or handle 52 to maintain the gripping device in either the
activated or deactivated position depending on the position of
control knob, lever, pin or handle 52 and locking mechanism 48.
Also, in an alternative embodiment of the invention, rod 58 and
gripping mechanism 46 may be constructed as a single integrated
component.
[0071] FIG. 7A shows an exposed front plan view of an alternative
embodiment of the walking crutch 12 shown in FIG. 1B having a
retractable gripping device 76 depicted in the retracted or
deactivated position. FIG. 7A further shows the internal components
of the retractable gripping device 76 in accordance with the
alternative embodiment of the invention. FIG. 7B shows an exposed
front plan view of the walking crutch 12 shown in FIG. 7A having a
retractable gripping device 76 depicted in the extended or
activated position. FIG. 7B further shows the internal components
of the retractable gripping device 76 in accordance with the
alternative embodiment of the invention. FIG. 7C shows an enlarged
view of the upper end of the retractable gripping device shown in
FIG. 7B, and FIG. 7D shows an enlarged view of the lower end of the
retractable gripping device shown in FIG. 7B. As depicted in FIGS.
7A-D, gripping device 76 preferably comprises knob or handle 72,
shaft or tube 76 having openings at either end, rod or tube 73,
locking mechanism 75, gripping surface or mechanism 22, and foot
20. Optionally, a spring 34, and bushing 74 may be employed. Spring
34 may optionally be positioned below the locking mechanism 75 such
that the spring 34 would exert an upward force on the rod 32 to
maintain the gripping device 76 in either the activated or
deactivated position depending on the position of control knob 72
and locking mechanism 75. Alternatively, the spring may be located
at or near the top of gripping device 76. Similarly, spring 34
would exert an upward force on the rod 73 at or near the control
knob 72 to maintain the gripping device 76 in either the activated
or deactivated position depending on the position of control knob
72 and locking mechanism 75. Also, in an alternative embodiment of
the invention, rod 73 and gripping mechanism 22 may be constructed
as a single integrated component, unlike the two separate
components as in the preferred embodiment.
[0072] More specifically, looking at FIG. 7B, depicted is the
crutch 12 shown in FIG. 1B, with the gripping device 76 activated
and in its extended position. As depicted more clearly in FIG. 2D,
which shows an enlarged view of the lower end of the walking crutch
12 shown in FIG. 2B, gripping mechanism 22 is in the activated and
in its extended position protruding through the bottom of tip 20.
To activate the gripping device 76, the user must push down the
knob 72 thereby forcing end 75 downward such that compressed gas or
air or fluid within space 78 near the lower end of gripping device
76 forces gripping mechanism 22 downward through the bottom of tip
20. Optionally, gripping device 76 has a locking mechanism 75 to
retain gripping device 76 in the activated position until such time
as the user wishes to deactivate gripping device 76. Preferably,
locking mechanism 75 is a pen-click type of locking device whereby
a first compression of knob 72 locks gripping device 76 in the
activated position, and a second compression of knob 72 releases
the gripping mechanism 22 such that gripping device is back in the
deactivated position.
[0073] As shown in FIG. 7A, when not activated a retaining spring
34 maintains the gripping device 76 in the retracted, deactivated
upward position. As shown in FIGS. 7B-D, when the gripping device
76 is activated in the extended position, the spring 34 is
compressed. When the knob 72 has been depressed a first time, the
spring 34 and locking mechanism 75 will hold the gripping device 76
in the locked and activated position. All downward pressure applied
to the gripping device 76 will maintain it in the locked position
in conjunction with the spring 34.
[0074] As shown in FIGS. 7A-D, the retractable gripping device 76
is preferably configured as a pen-click retractable locking system.
As described above in greater detail, the pen-click retractable
gripping device preferably comprises at least a pair of springs
that allow the gripping device 22 to retract. The first spring
(ratchet spring) is preferably located inside the bottom portion of
tube 76 of the gripping mechanism (i.e., where the gripping device
22 comes out). The rod 73 is positioned through this first spring
before going through the open end of the tube 76. At the upper end
of gripping mechanism 76, a second spring may be positioned inside
of upper end of the tube 76. This second spring (i.e., a knob
spring) may be connected to a screw and a clip, which are then
connected to the knob 72 at the end of the pen. When knob 72 is
depressed a first time, it presses down on the knob spring, which
then forces the rod or inner tube 73 downward and out through the
bottom end of gripping mechanism 76 such that it is in the
activated position. A locking mechanism 75 consisting of tiny pits
and teeth interlock with each other to keep the gripping mechanism
76 in its activated position. When knob 72 is depressed a second
time, it again presses down on the knob spring, which then forces
the rod or inner tube 73 downward and out through the bottom end of
gripping mechanism 76 such that the tiny pits and teeth unlock and
the rod or tube 73 and gripping device 22 are sprung back inside
tube 76 by the ratchet spring such that it is in the deactivated
position.
[0075] Turning next to FIG. 8A, shown is an exposed partial side
view of an alternative embodiment of the walker leg shown in FIG.
4B having a retractable gripping device 83 with the retractable
gripping device in the retracted or deactivated position, and
further shows the internal components of the retractable gripping
device in accordance with the alternative embodiment of the
invention. FIG. 8B shows an exposed partial side view of the walker
shown in FIG. 8A having a retractable gripping device with the
retractable gripping device in the extended or activated position,
and further shows the internal components of the retractable
gripping device in accordance with the alternative embodiment of
the invention. FIG. 8C shows an enlarged view of the upper end of
the retractable gripping device shown in FIG. 8B, while FIG. 8D
shows an enlarged view of the lower end of the retractable gripping
device shown in FIG. 8B.
[0076] In particular, FIGS. 8A-D depict another type of walking
assistance device for which the present invention may be used. FIG.
8A depicts a leg of a conventional walker such as the one shown in
FIGS. 4-5, which consists of a series of interconnected tubes,
bars, pipes or rods to form a frame that a user can easily and
safely use to support a good portion of his/her weight while
attempting to walk around. Typically, such conventional walkers are
configured to have four legs whose lower ends are configured to
interact with the ground surface. As shown in FIG. 4A, one such
convention walker includes wheels 44 on two legs, and feet 42 on
the other two legs. Other embodiments exist where all four legs
have wheels 44 on their lower ends, or all four legs have feet 42
on their lower ends.
[0077] Preferably, the retractable gripping device according to the
present invention may be employed in the legs of a conventional
walker that employs feet on the bottom ends of at least some of its
legs, as depicted in FIGS. 8A-D. In particular, FIGS. 8A-B show
side views of one leg of a walker employing a retractable gripping
device in accordance with an alternative embodiment of the
invention. Referring to FIG. 8A, shown is the gripping device
deactivated and in its retracted position. Referring to FIG. 8B,
shown is the gripping device activated and in its extended
position. As depicted more clearly in FIGS. 8C-D, an enlarged view
of the upper and lower ends of the leg shown in FIG. 8A. In
particular, shown is the retractable gripping device configured as
a pen-click retractable locking system. As described above in
greater detail, the pen-click retractable gripping device
preferably comprises at least a pair of springs that allow the
gripping device 46 to retract. The first spring (ratchet spring) is
preferably located inside the bottom portion of tube 84 of the
gripping mechanism (i.e., where the gripping device 46 comes out).
The rod 83 is positioned through this first spring before going
through the open end of the tube 84. At the upper end of gripping
mechanism, a second spring may be positioned inside of upper end of
the tube. This second spring (i.e., a knob spring) may be connected
to a screw and a clip, which are then connected to the knob 82 at
the end of the pen. When knob 82 is depressed a first time, it
presses down on the knob spring, which then forces the rod or inner
tube 83 downward and out through the bottom end of gripping
mechanism such that it is in the activated position. A locking
mechanism 85 consisting of tiny pits and teeth interlock with each
other to keep the gripping mechanism in its activated position.
When knob 82 is depressed a second time, it again presses down on
the knob spring, which then forces the rod or inner tube 83
downward and out through the bottom end of gripping mechanism such
that the tiny pits and teeth unlock and the rod or tube 83 and
gripping device 46 are sprung back inside tube 84 by the ratchet
spring such that it is in the deactivated position.
[0078] To activate the retractable gripping device, the user of the
walker 80 must push the activating knob 82 down (which may be any
convenient shape or size to provide easy access to and activation
of the knob) such that the locking mechanism 88 rotates into a
first locking position such that gripping device 46 is in the
activated position. To deactivate the gripping device 46, the user
must again push down the knob 82 such that the locking mechanism 88
rotates into a second locking position such that gripping device 46
is in the retracted, deactivated position. As shown in FIG. 8A,
when not activated, a retaining spring maintains the gripping
device 46 in the retracted, deactivated and upward position. Also
as shown, when the gripping device 46 is activated and in the
extended position, the spring is compressed. When the knob 82 is
again depressed, the spring will hold the gripping device 46 in the
locked and activated position. All downward pressure applied to the
gripping device 46 will maintain it in the locked position in
conjunction with the springs.
[0079] More particularly, FIGS. 8A-C depict the internal components
of the retractable gripping device in accordance with an
alternative embodiment of the invention. In particular, the
gripping device preferably comprises knob 82, rod or stem 83,
spring 34, locking mechanism 88, gripping surface or mechanism 46,
and foot 20. Of course, in this embodiment, the legs of walker 80
would preferably contain locking mechanism 88, respectively, to
pass through to the rod 83 that is positioned longitudinally within
the legs of walker 80. Optionally, a spring and bushings may be
employed. The spring may optionally be positioned below or above
the locking mechanism 88 such that the spring would exert an upward
force on the rod 83 to maintain the gripping device 46 in either
the activated or deactivated position depending on the position of
control knob and locking mechanism 88. Alternatively, the spring
may be located near control knob 82. In this configuration, the
spring would similarly exert an upward force on the rod 83 at or
near the control knob 82 to maintain the gripping device in either
the activated or deactivated position depending on the position of
control knob and locking mechanism 88. Also, in an alternative
embodiment of the invention, rod 83 and gripping mechanism 46 may
be constructed as a single integrated component.
[0080] Referring next to FIGS. 9A-D, shown is an exposed front plan
view of a second alternative embodiment of the walking crutch shown
in FIG. 1B having a retractable gripping device with the
retractable gripping device in the retracted or deactivated
position (see FIG. 9A), showing the internal components of the
retractable gripping device in accordance with the second
alternative embodiment of the invention, as well as with the
retractable gripping device in the extended or activated position
(see FIGS. 9B-D). In particular, depicted in FIGS. 9B-D is the
crutch 12 shown with the gripping device 22 activated and in its
extended position. As depicted more clearly in FIG. 9D, an enlarged
view of the lower end of the walking crutch 12 showing gripping
device 22 is in the activated and in its extended position within
bored opening 36 such that gripping mechanism or surface 22 is
protruding through the bottom of tip 20. Preferably, this second
alternative embodiment of the gripping mechanism comprises knob 90,
fluid chamber 92, connector 96, stem or tube 93, bushings 94 and
98, spring 96, compression chamber 95, and gripping device 22.
[0081] To activate the gripping device 22, the user must in one
embodiment repeatedly press on knob 90 such that gas or other fluid
is forced from chamber 92 through stem or tube 93 into compression
chamber 95 thereby exerting a downward force on bushing 98
sufficient enough to compress spring 96 and move gripping device
downward through bore 36 in bottom of tip 20. Alternatively, the
forcing of gas or other fluid from chamber 92 through stem 93 into
chamber 95 may be controlled by continued rotation of knob 90 until
sufficient gas or fluid has entered chamber 95 to force gripping
device through the bottom of tip 20. Preferably, bushing 94 is
fixed in position with lateral seal within the tube of the gripping
mechanism, while bushing 98 is preferably moveable laterally within
the tube but also with lateral seal such that the fluid or gas may
not escape.
[0082] To deactivate the gripping device 22, the user must again
push down and hold the knob 90 to release the fluid or gas from
chamber 95 such that the downward force exerted on gripping device
22 reduces such that the upward force exerted by spring 96 is
greater than the downward force exerted by the gas or fluid in
chamber 95 and to retract gripping device 22 and return the
gripping device 22 back to its retracted, deactivated position. As
shown in FIG. 9A, when not activated a retaining spring 96
maintains the gripping device 22 in the retracted, deactivated
upward position. As shown in FIGS. 9B-D, when the gripping device
22 is activated in the extended position, the spring 96 is
compressed. All downward pressure applied to the gripping device 22
by the gas or fluid in chamber 95 will maintain gripping device 22
in a locked position in conjunction with the spring 96.
[0083] Referring next to FIGS. 10A-D and 11, shown are whole (FIG.
11) and partial (FIGS. 10A-D) exposed side view of an alternative
embodiment of the gripping mechanism for use with a walker like the
one shown in FIG. 5A having a second alternative embodiment of the
retractable gripping device similar to the one depicted in FIGS.
9A-D. FIG. 10A shows the retractable gripping device in the
retracted or deactivated position, while FIGS. 10B-D shows a
partial exposed side view of the retractable gripping device with
the retractable gripping device in the extended or activated
position. As depicted more clearly in FIG. 10D, an enlarged view of
the lower end of the walker 100 showing gripping device 46 in the
activated and in its extended position within bored opening 66 such
that gripping device or surface 46 is protruding through the bottom
of tip 20. Preferably, this second alternative embodiment of the
gripping mechanism comprises knob 102, fluid chamber 103, connector
104, stem or tube 105, bushings 106 and 109, spring 108,
compression chamber 107, and gripping device 46.
[0084] Similar to the embodiment shown in FIGS. 9A-D, to activate
the gripping device 46, the user must in one embodiment repeatedly
press on knob 102 such that gas or other fluid is forced from
chamber 103 through stem or tube 105 into compression chamber 107
thereby exerting a downward force on bushing 109 sufficient enough
to compress spring 108 and move gripping device downward through
bore 66 in bottom of tip 20. Alternatively, the forcing of gas or
other fluid from chamber 103 through stem 105 into chamber 107 may
be controlled by continued rotation of knob 102 until sufficient
gas or fluid has entered chamber 107 to force gripping device 46
through the bottom of tip 20. Preferably, bushing 106 is fixed in
position with lateral seal within the tube of the gripping
mechanism, while bushing 109 is preferably moveable laterally
within the tube but also with lateral seal such that the fluid or
gas may not escape.
[0085] To deactivate the gripping device 46, the user must again
push down and hold the knob 102 to release the fluid or gas from
chamber 107 such that the downward force exerted on gripping device
46 reduces such that the upward force exerted by spring 108 is
greater than the downward force exerted by the gas or fluid in
chamber 107 and to retract gripping device 46 and return the
gripping device 46 back to its retracted, deactivated position. As
shown in FIG. 10A, when not activated a retaining spring 108
maintains the gripping device 46 in the retracted, deactivated
upward position. As shown in FIGS. 9B-D, when the gripping device
46 is activated in the extended position, the spring 108 is
compressed. All downward pressure applied to the gripping device 46
by the gas or fluid in chamber 108 will maintain gripping device 46
in a locked position in conjunction with the spring 108.
[0086] The following provides an exemplary list of various parts
used in accordance with a preferred embodiment of the present
invention. As will be appreciated by those skilled in the art from
the foregoing, other similar parts may be used to with the present
invention without diverting from the spirit and function of the
present invention. Part 28 is preferably a knurled activating knob,
but other types of knobs or handles may be used. Part 32 is the
center rod or shaft connecting the activating knob to the gripping
mechanism. Part 30 is preferably a press fit bushing which supports
and centers the upper end of the center rod or shaft. Part 26 is
the extended lower shaft housing for the retractable gripping
device. Part 38 is a bushing that is fastened to the center rod,
preferably by a screw. In a preferred embodiment of the invention,
the head of the fastening screw protrudes through the wall of lower
shaft housing and rides within the locking slot 37 machined into
the housing. Part 34 is a spring automatically returns the gripping
mechanism to its retracted position when the control or activating
knob is pushed down and turned counter-clockwise. Then spring will
then hold the gripping device in the upward, retracted position,
ready for reactivation when needed by the user. When the control or
activating knob is pushed down and turned clockwise, the spring
holds the gripping mechanism in the activated or extended position.
Part 20 is a rubber foot on the bottom end of lower shaft housing
26 and is maintained in position by Part 36. Preferably, this foot
has a clearance hole in its bottom center position to allow the
gripping mechanism to protrude therethough when in its activated or
extended position. Part 36 is a guide bushing which guides the
gripping device and is press fit into the lower end of lower shaft
housing 26. The bushing also locks the rubber foot in position at
the lower end of lower shaft housing 26. Part 22 is the gripping
mechanism which is attached to the center rod or shaft on its lower
end and is accurately guided through the rubber foot by the guide
bushing.
[0087] It will be recognized by those of skill in the art that the
above disclosure may be optionally actuated by a number of
mechanisms without departing from the scope and spirit of the
present invention. For example, the use of a power source
(battery), electrical wires, switch, and a motion actuator (screw
drive, linear actuator etc) to operate (drive and retract) the
retractable gripping apparatus is included herewith, although not
depicted. Such a modification would be understood following
complete study of the enclosed disclosure so as to enable
modification suitable within the required structures to accomplish
the goals herein. Similarly, the use of a compressed gas volume
(cylinder) to drive and retract a piston connected to a retractable
gripping apparatus is included herewith. Similarly any type of
pneumatic and hydraulic type actuation system for operating the
retractable gripping apparatus is similarly incorporated herewith.
Finally, it will be recognized that any suitable means or operable
system that may be incorporated in a portable support assistance
device (e.g., walking device) maybe operably used to operate the
proposed retractable gripping apparatus within the scope of the
present invention.
[0088] In the claims, means or step-plus-function clauses are
intended to cover the structures described or suggested herein as
performing the recited function and not only structural equivalents
but also equivalent structures. Thus, for example, although a nail,
a screw, and a bolt may not be structural equivalents in that a
nail relies on friction between a wooden part and a cylindrical
surface, a screw's helical surface positively engages the wooden
part, and a bolt's head and nut compress opposite sides of a wooden
part, in the environment of fastening wooden parts, a nail, a
screw, and a bolt may be readily understood by those skilled in the
art as equivalent structures.
[0089] Having described at least one of the preferred embodiments
of the present invention with reference to the accompanying
drawings, it is to be understood that such embodiments are merely
exemplary and that the invention is not limited to those precise
embodiments, and that various changes, modifications, and
adaptations may be effected therein by one skilled in the art
without departing from the scope or spirit of the invention as
defined in the appended claims. The scope of the invention,
therefore, shall be defined solely by the following claims.
Further, it will be apparent to those of skill in the art that
numerous changes may be made in such details without departing from
the spirit and the principles of the invention. It should be
appreciated that the present invention is capable of being embodied
in other forms without departing from its essential
characteristics.
* * * * *