U.S. patent number 3,635,233 [Application Number 05/021,140] was granted by the patent office on 1972-01-18 for collapsible cane and crutch construction.
Invention is credited to Charles H. Robertson.
United States Patent |
3,635,233 |
Robertson |
January 18, 1972 |
COLLAPSIBLE CANE AND CRUTCH CONSTRUCTION
Abstract
Segmented supporting aids of collapsible construction held in
locking engagement by a tension cord disposed within the tubular
segments of the aid. In addition to a collapsible cane
construction, a forearm engaging crutch with an improved adjustable
forearm engaging band and an underarm-engaging crutch having an
adjustable handgrip.
Inventors: |
Robertson; Charles H. (Dumas,
TX) |
Family
ID: |
21802568 |
Appl.
No.: |
05/021,140 |
Filed: |
March 19, 1970 |
Current U.S.
Class: |
135/71;
135/114 |
Current CPC
Class: |
A61H
3/02 (20130101); A61H 2201/0161 (20130101) |
Current International
Class: |
A61H
3/00 (20060101); A61H 3/02 (20060101); A44b
001/00 (); A45b 009/02 () |
Field of
Search: |
;135/15PO,4,45,47,47.5,49,50,51,52,53 ;287/20,85,86
;24/132AS,132WL,248,248B,248L,248SB,249,249LL,25U,258 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Caun; Peter M.
Claims
I claim:
1. A collapsible supporting aid comprising:
a tubular, lower segment;
bottom anchor means connected to said lower segment;
a tubular, upper segment;
top anchor means connected to said upper segment;
a tubular, intermediate segment disposed between said upper segment
and said lower segment;
a plurality of joint connections integral with said segments to
provide removable interlocking engagement therebetween; and
tension means disposed within said segments and connected to said
top anchor means and said bottom anchor means, said tension means
operable to retain said segments in interlocking engagement;
wherein
each said joint connection includes: a male-fitting integral with
one said segment and which has a circumferential shoulder with an
inwardly tapered portion therefrom and a truncated hemispherical
ball seat at the outer end of said tapered portion; a female socket
integral with the adjacent said segment and which has an abutment
lip with an inwardly tapered receiver therefrom and a truncated
hemispherical ball seat at the inner end of said tapered receiver;
and a ball member having a central bore therein which receives said
tension means; wherein
said abutment lip is operable to engage said circumferential
shoulder, said tapered receiver is operable to matingly engage said
tapered portion, and said ball member is operable to engage said
ball seat of said male fitting and said ball seat of said female
socket when said segments are interlockingly engaged.
2. A collapsible supporting aid comprising:
a tubular, lower segment;
bottom anchor means connected to said lower segment;
a tubular, upper segment;
top anchor means connected to said upper segment;
a tubular, intermediate segment disposed between said upper segment
and said lower segment;
a plurality of joint connections integral with said segments to
provide removable interlocking engagement therebetween; and
tension means disposed within said segments and connected to said
top anchor means and said bottom anchor means, said tension means
operable to retain said segments in interlocking engagement;
wherein
said top anchor means comprises a post member laterally disposed in
said upper segment of said joint connection between said upper
segment and said intermediate segment, and
said intermediate segment having recess means at said joint
connection to receive said post member and thereby provide fixed
axial alignment between said upper segment and said intermediate
segment.
3. A joint construction for interconnecting a pair of tubular
segments held in interlocking engagement by tension means disposed
within said segments, said joint construction comprising:
a male-fitting integral with one said segment and having a
circumferential shoulder with an inwardly tapered portion therefrom
and a truncated hemispherical ball seat at the outer end of said
tapered portion;
a female socket integral with the other said segment and having an
abutment lip with an inwardly tapered receiver therefrom and a
truncated hemispherical ball seat at the inner end of said tapered
receiver; and
a ball member having a central bore therein which receives said
tension means; wherein
said abutment lip is operable to engage said circumferential
shoulder, said tapered receiver is operable to matingly engage said
tapered portion, and said ball member is operable to engage said
ball seat of said male fitting and said ball sat of said female
socket when said segments are interlockingly engaged.
4. A joint construction for interconnecting a pair of tubular
segments held in interlocking engagement by tension means disposed
within said segments, said joint construction comprising:
a male-fitting integral with one said segment and having an
inwardly tapered portion and a recessed surface at the outer end of
said tapered portion;
a female socket integral with the other said segment and having an
inwardly tapered receiver and a recessed surface at the inner end
of said tapered receiver; and
an intersegment member with first and second mating surfaces and
having a central bore therethrough which receives said tension
means; wherein
when said segments are interlockingly engaged, said tapered portion
of the male fitting matingly engages said tapered receiver of the
female socket, said first mating surface of the intersegment member
engages said recessed surface of the male fitting, and said second
mating surface of the intersegment member engages said recessed
surface of the female socket.
Description
Yet a BACKGROUND AND SUMMARY OF THE INVENTION
One who requires the use of a supporting aid, such as a cane or
crutch, is frequently confronted with the problem of finding a
temporary storage location for the aid not in use. In public
places, the cane or crutch is normally stowed under a seat or
propped against a convenient object. Since either storage location
may present an awkward obstruction for passers-by, unnecessary
embarrassment for the user can result.
There is a need for a supporting aid construction which can be
readily collapsed and stored in a small space. However, it is
important that the collapsible cane or crutch in the assembled
condition retain the strong and rigid structural features of a
conventional supporting aid and thereby provide assurance for the
user that the construction is entirely dependable.
The primary object of this invention is to provide a collapsible
supporting aid which collapses and stores in a small space, but
which retains in the assembled condition all the advantages and
structural features of a conventional supporting aid.
Another object of the invention is to provide a collapsible
supporting aid having an elongate shaft formed by a plurality of
removable interlockable, tubular segments held in positive
engagement by tension means concealed within the segments. By
pulling the segments from one another, the construction can be
folded and stored in a handbag, brief case or the like when the
user is seated. Such storage condition may be accomplished by the
elasticity of the tension means which retains the relative order of
the segments and eliminates the possibility of lost parts.
Yet another object of the invention is to provide a supporting aid
of the character described wherein an improved joint construction
provides an assembled supporting aid with sturdy and rigid
structural features. Additionally, the joint construction insures
positive alignment between the segments when the supporting aid is
reassembled.
A further object of the invention is to provide a forearm engaging
crutch and an underarm engaging crutch, each of which is
constructed from a plurality of tubular segments which can be
folded and stored in a surprisingly small space. When in use, the
segments are locked together in engaging fashion by tension means
to provide a safe, dependable and sturdy supporting aid.
An additional object of the invention is to provide a forearm
engaging crutch and an underarm engaging crutch of the character
described, each of which has positive locking means to insure
correct alignment between the segment having a forearm engaging
member or underarm engaging member and the segment having an
associated handgrip.
Another object of the invention is to provide an underarm engaging
crutch of the character described which includes an adjustable
handgrip to vary the distance between the handgrip and the ground.
Such construction permits the crutch to be individually tailored to
fit the user as he may prefer.
A further object of the invention is to provide a forearm-engaging
crutch having an adjustable forearm-engaging band which performs
the function of a conventional band but does so regardless of the
amount of clothing the user may be wearing. The forearm engaging
band is also movable to an upright lock position to provide support
for the user's forearm when free use of the hands is required.
Yet a further object of the invention is to provide a joint
construction of the character described which is adaptable for
interconnecting a wide variety of tubular segments in self-aligning
and self-tightening fashion, such as fishing poles, tent poles,
lawn furniture, and liquid or gas flow lines, to mention a few
examples. By employing this joint construction, the exterior
surface of the assembled product is uniform and smooth to retain
the appearance of a product constructed from a single length of
tubing.
Other and further objects of the invention, together with features
of novelty appurtenant thereto, will appear in the course of the
following description.
DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which form a part of the instant
specification and are to be read in conjunction therewith, like
reference numerals are employed to indicate like parts in the
various views:
FIG. 1 is a side view of a collapsible, segmented cane constructed
in accordance with a preferred embodiment of the invention and
shown in a collapsed condition;
FIG. 2 is a side view of a collapsible, forearm engaging crutch
constructed in accordance with a preferred embodiment of the
invention and shown in the assembled condition;
FIG. 3 is a top view, along line 3--3 of FIG. 2 in the direction of
the arrows, of the forearm-engaging member of the crutch
construction shown in FIG. 2;
FIG. 4 is an enlarged sectional view, along line 4--4 of FIG. 2 in
the direction of the arrows, illustrating one form of a joint
construction embodying the instant invention;
FIG. 5 is an exploded sectional view of the joint construction
shown in FIG. 4;
FIG. 6 is a side view of a collapsible, underarm engaging crutch
constructed in accordance with a preferred embodiment of the
invention and shown in the assembled condition;
FIG. 7 is an enlarged sectional view of an optional joint
construction embodying the instant invention;
FIG. 8 is an exploded sectional view of the joint construction
shown in FIG. 7; and
FIG. 9 is an enlarged sectional view along line 9--9 of FIG. 6 in
the direction of the arrows.
As previously noted, this invention relates to segmented canes and
crutches of collapsible construction. FIG. 1 illustrates a
collapsible cane which basically comprises a tubular lower segment
10 having a ground-engaging tip 11, a plurality of tubular
intermediate segments 12 and 13, and a tubular upper segment 14. A
cap member 15 having a handgrip 16 associated therewith is attached
to the upper segment 14. Laterally received by the upper segment 14
is a top pin member 17 to which a tension cord 18 is internally
connected. The cord 18 is disposed within the intermediate segments
12 and 13 and is, in turn, connected to a bottom pin member 19 in
the lower segment 10.
When the segments are aligned end to end, with the tapered portion
(later to be described) of one segment fitting within the socket
portion of the adjacent segment, the segments of the cane are held
in locking engagement by the cord 18 acting between the top pin
member 17 and the bottom pin member 19. The tension cord 18 may be
of a resilient nature which elastically pulls the segments
together. On the other hand, a prestressed wire rope can also be
employed for this purpose in conjunction with tightening means
(such as a turnbuckle) operative in response to rotatably turning
the lower segment 10. When this invention is adapted to
interconnect large tubular segments, it may be necessary to employ
a wrench at one end of the tubing as tightening means. Irrespective
of the method, however, this principle of holding the segments in
engagement with a retaining force supplied by a tension cord is
utilized in the crutch constructions now to be described.
FIG. 2 illustrates a collapsible, forearm-engaging crutch in the
assembled condition. The crutch includes a lower segment 20 having
a ground-engaging tip 21 and a bottom pin member 22 on which a
tension cord (not shown) is attached, intermediate sections 23 and
24, and an upper section 25 which terminates in a slotted cap
member 26.
Elongated slots 27 in each side of the cap member 26 receive a
pivot post 28 which supports the center leg of a T-shaped block 29.
A U-shaped forearm-engaging band 30 is connected, by a bolt 31 and
nut 32, to each arm of the block 29. As viewed in FIG. 3, the band
30 includes a spring hinge 33 therein so one section of the band 30
can swing away (broken line view) from the opposite section to
accommodate the user's forearm regardless of the thickness of
clothing being worn. In addition, the band 30 may be provided with
an adjustable chain 30a or similar member to interconnect the ends
thereof to retain the user's forearm.
Projecting from the rear side of the band 30 adjacent the cap
member 26 are a pair of bosses 34. When the band is pivoted to a
vertical position, the bosses are received within notches 35 in the
upper end of the cap member 26 to thereby retain the band 30 should
the user require free use of his hands while standing. Therefore,
in addition to the normal function of engaging the forearm, the
band 30 in the latter position affords support through the forearm
of the user.
On the intermediate segment 24 adjacent the upper segment 25, a
cylindrical sleeve 36 is sweated or otherwise rigidly attached. A
handgrip 37 is attached to the sleeve 36 and projects outwardly
therefrom in alignment with the forearm-engaging band 30.
The top pin member 38 of the upper segment 25 which, as viewed in
FIGS. 4 and 5, supports a ring 39 attached to the tension cord 40,
is located at the exterior joint line 41 between the upper segment
25 and the intermediate segment 24. The intermediate segment 24
includes semicircular recesses 42 which receive the top pin member
38 and provide positive interlocking alignment between these
segments so that the handgrip 37 will at all times be correctly
positioned beneath the forearm-engaging band 30.
The sleeve 36 attached to the intermediate segment 24 also includes
semicircular recesses 43 which receive the top pin member 38 and
cooperatively aid the similar recesses 42 in the intermediate
section 24 in achieving the positive interlocking engagement.
FIG. 6 illustrates a collapsible, underarm engaging crutch in the
assembled position. The lower segment 44 terminates in a
ground-engaging tip 45 and has a bottom pin member 46 which is
connected to a tension cord (not shown) disposed within the
intermediate segments 47 and 48. The upper segment 49 terminates in
a slotted end cap 50 having an associated pin 51 which supportingly
receives a curvilinear, underarm-engaging extension 52.
The intermediate segment 48 adjacent the upper segment 49 includes
a handgrip support which is a modification of the previously
mentioned form. A sleeve 53 having a hand grip 54 attached thereto,
is slidably received by the intermediate segment 48. As viewed in
FIGS. 6 and 9, the sleeve 53 is pinned to the segment 48 by
removable bolt members 54 associated with the sleeve 53 and which
extend into adjustment holes 55 provided along the length of the
segment 48. Therefore, the distance between the ground tip 45 and
the handgrip 54 can be varied, as required by the distance from the
ground of the user's hands, simply by removing the bolt members 54,
sliding the sleeve 53 accordingly upward or downward, and
reinserting the bolt members 54 into the appropriate adjustment
holes 55.
Since it is important that the handgrip 54 be aligned with the
underarm extension 52, the top pin member 56 is located at the
exterior joint line 57 between the upper segment 49 and
intermediate segment 48 and is received by semicircular recesses 58
in the intermediate segment 48 to provide positive interlocking
alignment between the segments 48 and 49.
The collapsible canes or crutches previously described may utilize
either of the alternate joint constructions now to be discussed in
detail.
Referring to FIGS. 1, 4 and 5, the male fitting at the end of a
segment comprises a circumferential ledge 59 at the exterior joint
line 41 and a tapered portion 60 which tapers inwardly from the
ledge 59 to the end 61 of the segment 25. The female socket of the
adjacent segment 24 includes an abutment lip 62 at the exterior
joint line 41 and a tapered receiver 63 which is tapered inwardly
from the abutment lip 62. In the assembled condition, therefore,
the abutment lip 62 of the female socket engages the
circumferential ledge 59 of the male fitting and the tapered
receiver 63 of the female socket mates with the tapered portion 60
of the male fitting.
The alternate form of joint construction is viewed in FIGS. 7 and
8. The male fitting of the segment 64 comprises a circumferential
ledge 65 at the exterior joint line 66 and a tapered portion 67
which tapers inwardly from the ledge 65 to the end 68 of the
segment 64. Centrally disposed in the end 68 of the segment 64 is a
truncated hemispherical ball seat 69.
The female socket includes an abutment lip at the exterior line 66
of the segment 71 and an inwardly tapered receiver 72 terminating
in an internal ledge 73. Centrally disposed within the socket and
continuous with the internal ledge 73 is a truncated hemispherical
ball seat 74. A spherical ball member 75 having a central bore 76
therethrough which receives the tension cord 77 is interposed
between the segments 64 and 71.
In the assembled condition, the abutment lip 70 of the female
socket engages the circumferential ledge 65 of the male fitting,
the tapered receiver 72 of the female socket mates with the tapered
portion 67 of the male fitting, and the end 68 of the male-fitting
abuts the internal ledge 73 of the female socket. In addition, the
ball member 75 seats between the truncated hemispherical ball seats
69 and 74 of the male fitting and female socket.
Assuming that one of the canes or crutches herein disclosed is in
the assembled condition with a resilient-type tension cord, and is
no longer needed as a walking or supporting aid, it may be
collapsed in the following manner. With one hand on a segment, and
the other hand on the adjacent segment, the user simply pulls the
segments apart and folds them together. With all the segments
pulled apart and folded together, the cane or crutch can be stored
in a surprisingly small space until once again needed.
When the cane or crutch is once again needed, the user simply
straightens the supporting aid and the segments are pulled together
by the resilient cord to once again provide a sturdy construction.
In this connection, I have found that the ball joint construction
as viewed in FIGS. 7 and 8 is automatically self-aligning and the
segments are mated in engaging relationship merely by unfolding.
However, the joint construction as shown in FIGS. 4 and 5,
occasionally requires initial alignment to insure the male fitting
is properly mated within the female socket.
If a prestressed wire rope is employed in lieu of a resilient cord
as tension means, it should be understood that it must be loosened
to collapse the tubular construction and tightened to reassemble he
same.
When reassembling the crutch construction as shown in FIGS. 2 or 6,
the user may find that the forearm-engaging band or the underarm
extension is not aligned with the handgrip. In this case, simple
rotation of the upper segment until the top pin member snaps into
the semicircular recesses of the intermediate segment will insure
positive alignment and thereby complete the reassembly process.
When employing a supporting aid constructed in accordance with this
invention, the user no longer need be apprehensive about locating a
suitable place to store his supporting aid when not in use. By
simply collapsing the aid, it can be stored in a purse, brief case
or the like without presenting an awkward obstruction for other
people. When reassembled the crutch or cane provides all the
benefits and advantages previously associated with these aids.
From the foregoing, it will be seen that this invention is one well
adapted to attain all of the ends and objects hereinabove set forth
together with other advantageous which are obvious and which are
inherent to the structure.
It will be understood that certain features and subcombinations are
of utility and may be employed without reference to other features
and subcombinations.
As many possible embodiments may be made of the invention without
departing from the scope thereof, it is to be understood that all
matter herein set forth or shown in the accompanying drawings is to
be interpreted as illustrative and not in a limiting sense.
* * * * *