U.S. patent number 3,690,652 [Application Number 05/150,402] was granted by the patent office on 1972-09-12 for foldable invalid walker convertible from fixed to swingable walker.
Invention is credited to 01267, Joseph C. Schneider, 83 Main Street.
United States Patent |
3,690,652 |
|
September 12, 1972 |
FOLDABLE INVALID WALKER CONVERTIBLE FROM FIXED TO SWINGABLE
WALKER
Abstract
A foldable invalid walker is provided with a pair of locking
keys each of which is mounted within a leg of the walker for
movement into either a narrow slot for use of the walker as a fixed
walker, or into a wide slot for use of the walker as a swingable
striding walker. When the keys are positioned in their respective
narrow slots, the associated legs are held against relative
movement with respect to the rest of the walker. When the keys are
positioned in their respective wide slots, the associated legs are
pivotally mounted to the rest of the walker, thus converting the
walker to a swingable walker. The walker can further be folded for
storage.
Inventors: |
Joseph C. Schneider, 83 Main
Street (Williamstown, MA), 01267 (N/A) |
Family
ID: |
22534361 |
Appl.
No.: |
05/150,402 |
Filed: |
June 7, 1971 |
Current U.S.
Class: |
482/66;
135/67 |
Current CPC
Class: |
A61H
3/00 (20130101) |
Current International
Class: |
A61H
3/00 (20060101); A61h 003/00 () |
Field of
Search: |
;272/70.3,70.4 ;297/5,6
;135/45A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Richard C. Pinkham
Assistant Examiner: R. T. Stouffer
Attorney, Agent or Firm: Vincent H. Sweeney
Claims
What is claimed is:
1. A foldable invalid walker usable as fixed walker and as a
swingable walker, said walker comprising a pair of substantially
U-shaped leg members, a cross-brace joining said leg members, at
least one locking means having key and slot elements, one of said
elements on at least one of said leg members and the other of said
elements on said cross-brace, said slot elements including a narrow
slot to snugly engage said key to lock said cross-brace and the
associated leg member against relative movement to provide a fixed
walker and a wide slot to provide for relative pivotal movement
between said cross-brace and the associated leg member to permit
limited movement of said key to provide a swingable walker.
2. The walker of claim 1 wherein said cross-brace includes at least
one bearing sleeve at each end, and said leg members are rotatably
mounted in said bearing sleeves.
3. The walker of claim 2 wherein one of said keys is mounted in
each of said pair of leg members, and each of said bearing sleeves
contains said narrow slot and said wide slot.
4. The walker of claim 3 wherein each of said keys is mounted
within an opening in said leg and selectively urged into engagement
with one of said slots in said bearing sleeves.
5. The walker of claim 4 wherein each of said keys is restrained
from loss by a collar on said bearing sleeves.
6. The walker of claim 5 wherein each of said keys includes a push
button extending beyond said bearing sleeves for selectively
disengaging said keys from said slots.
7. The walker of claim 6 wherein each of said wide slots is so
dimensioned as to limit the rotation of said legs to provide a
stride limiting swingable walker.
8. The walker of claim 7 wherein said cross-brace includes a pair
of V-shaped members joined at their mid-points, said V-shaped
members being terminated at both ends by one of said bearing
sleeves.
9. The walker of claim 8 wherein said cross-brace is retained on
said leg members by a split sleeve fixed thereto and positioned
between said bearing sleeves.
10. The walker of claim 9 wherein said push button of said key
extends through the split in said split sleeve.
Description
This invention relates to a foldable invalid walker, and more
particularly to a foldable invalid walker that is selectively
operable as a fixed walker or as a swingable walker.
Foldable invalid walkers are now well established in the hospital
supply art; although the folding means of prior art walkers are
generally more complex than desirable. Most prior art foldable
walkers are of the fixed type, wherein the spaced legs and the
cross braces are fixed in relation to one another during use of the
walker; although the prior art means for locking the members to
assure the fixed relationship generally provide less than the
desired degree of stability. Swingable walkers permit the spaced
legs to be alternately advanced as the patient seeks to regain his
normal walking motion; although prior art swingable walkers
generally employ massive braces to limit the advancement of the leg
members.
It is an object of this invention to provide a foldable invalid
walker that is selectively usable as both a fixed walker and as a
swingable walker. Another object is the provision of a walker
having unitary simple means for folding the walker and for
converting the walker to either fixed or swingable use. A further
object is the provision of unitary means for alternately
establishing stability for a fixed walker and for establishing
limits for a swingable walker and for establishing compactness for
a folding walker.
In accordance with this invention a foldable invalid walker capable
of use as both a fixed and swingable walker is provided by unitary
locking means having an unlocked position for folding the walker, a
locked position for stabilizing the walker as a fixed walker, and
another locked position for limiting the movement of the legs of
the walker as a swingable walker.
In general, the walker of this invention employs a spring urged key
mounted within a leg of the walker for movement into either a
narrow slot for use as a fixed walker, or into a wide slot for use
as a swingable walker. Whenever the key is not within either the
narrow slot or the wide slot, the legs of the walker can be folded
against the cross-brace for compact storage.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of the walker of this invention;
FIG. 2 is a fragmentary view of one of the legs of the walker of
FIG. 1;
FIG. 3 is a fragmentary view partially in section along the line
3--3 of FIG. 2;
FIG. 4 is a fragmentary view of the structure of FIG. 2 in another
locked position;
FIG. 5 is a fragmentary cross section in expanded form taken along
the line 5--5 of FIG. 2; and
FIG. 6 is a top view of the walker of FIG. 1 in folded
position.
DESCRIPTION OF THE INVENTION
The drawing shows the walker 10 of this invention having a pair of
substantially U-shaped leg members 12 joined by cross-brace 20.
Each of the legs 12 has adjustable feet 14 at both of its ends. A
spring urged button 15 secured near the bottom of each leg 12 is
selectively engaged in one of spaced holes 16 in foot 14 according
to the height of the user of the walker 10 of this invention. Each
of feet 14 has a conventional non-slip cap, preferably of rubber or
other material acceptable to the hospital supply art, covering the
ends of feet 14.
Legs 12 are preferably of one inch anodized aluminum tubing to
provide strength at low weight. The legs 12 are substantially
U-shaped, and are slightly more spaced at the feet 14 than at the
bight portion at hand grips 13. The grips 13 are slotted or knurled
in conventional manner to prevent the user from losing his gripping
position while shifting his weight during use of the walker. The
grips 13 are secured by rubber cement or the like at the generally
flat portion of the bight or bottom of the U.
The U-shape of legs 12 is maintained by stretchers 18 which are
secured to legs 12 about three-quarters of the distance from grips
13 to feet 14. Stretchers or braces 18 are also preferably of
anodized aluminum tubing which is flattened at its ends and half
rounded to snugly engage legs 12 and impart rigidity thereto. The
stretchers 18 are secured to legs 12 by steel rivets 19 or other
known securing means.
Cross-brace 20 as shown is made up of two broad V-shaped members 22
and 24 joined at their mid-point 26. Members 22 and 24 are
preferably of chrome plated steel tubes for strength. The use of
steel also facilitates making connections thereto, such as the
joint 26, by welding. The inverted V-shape of member 24 provides
cross-brace 20 with a design that is convenient for use over a
standard height toilet.
The ends of brace members 22 and 24 are joined to tubular bearing
sleeves 23 and 25, respectively. Again, the use of steel permits
welding the members to the sleeves; however, other known metal
working joints may be used with other metals if desired.
Cross-brace 20 is positioned on legs 12 by sliding the brace onto
the legs before adding feet 14 and spreader 18. Cross-brace 20 is
fixed in position on legs 12 by split sleeves 28 which are pinned
to legs 12 by through rivets 29 which are substantially parallel to
joint 26 of members 22 and 24.
Legs 12 are each provided with longitudinal openings or slots, as
best shown in FIGS. 3 and 5 to accommodate locking key 30
substantially normal to rivet 29. Key 30 is provided with a notch
32 which fits around rivet 29 to fix key 30 against vertical
movement within leg 12. Springs 34 urge key 30 outwardly of the
slot in leg 12 through the split in split sleeve 28 and into either
narrow slot 40 or wide slot 42 in both of bearing sleeves 23 and 25
into a stop provided by collars 36 which are fixedly joined to
bearing sleeves 23 and 25. Collars 36 serve to restrain key 30 from
loss through expulsion from leg 12 by the action of springs 34 as
shown in FIG. 3. Key 30 is made of any rigid material that permits
easy machining such as plastic or metal.
As shown in FIGS. 3 and 5, slot 40 is of approximately the width of
key 30 to provide a snug fit therebetween, so that engagement of
key 30 in slot 40 locks leg 12 against rotation, and thereby
provides the fixed walker position of the walker 10 of this
invention. Slot 42 is substantially wider than key 30 so as to
permit limited arcurate rotation of leg 12 within the limits set by
slot 42, and thereby provides the swingable walker position of
walker 10.
The extension of key 30 beyond collar 36 serves as a push button to
disengage key 30 from either of the slots 40 and 42 in sleeves 23
and 25. With key 30 disengaged from slots 40 and 42 the legs 12 may
be folded against cross-brace 20, which is the folded position of
walker 10. As shown in FIG. 6, folding one leg 12 on one side of
cross-brace 20 and the other leg 12 on the other side of
cross-brace 20 provides compact storage of the walker of this
invention. The constant pressure maintained on key 30 by springs 34
causes key 30 to snap into either slot 40 or slot 42 when the legs
12 are unfolded from the storage position.
Slots 40 in bearing sleeves 23 and 25 should be of approximately
the same width as key 30 so as to afford rigidity to walker 10 when
legs l2 are in the fixed walker position. However, slots 42 in
bearing sleeves 23 and 25 may be of any desired width depending on
the stride action that is to be afforded the user. It is important
that overstriding by the user be restrained by limiting slots 42 to
about one-third of the circumference of sleeves 23 and 25.
This description has disclosed the preferred arrangement of the key
30 in a leg and the slots 40 and 42 in the bearing sleeves 23 and
25 of cross-brace 20. However, it should be understood that other
arrangements of the key and slot elements may be employed to attain
several of the advantages of this invention. For example, the key
may be mounted on the cross-brace and urged into slots in the legs
for usage where the rigidity and stability of the preferred
embodiment is not demanded.
* * * * *