U.S. patent number 3,902,758 [Application Number 05/419,485] was granted by the patent office on 1975-09-02 for self-storing foot and legrest assembly.
This patent grant is currently assigned to Invacare Corporation. Invention is credited to William J. Pivacek.
United States Patent |
3,902,758 |
Pivacek |
September 2, 1975 |
Self-storing foot and legrest assembly
Abstract
A footrest and legrest assembly for an invalid's chair or
wheelchair that is storable within the chair. A footrest is
adjustably mounted on a supporting frame which is slidably and
telescopically mounted in horizontal tubular elements of the chair
and is movable fore and aft relative to the front of the chair. The
legrest is pivotally and frictionally mounted on a U-shaped support
member which is slidably mounted independently of the footrest on
the supporting frame and is movable above the footrest toward or
away from the front of the chair when the frame is extended
forwardly of the chair. Storage of the legrest under the seat of
the chair is provided when use of the footrest only is desired.
Storage of both the footrest and the legrest under the seat of the
chair is provided when the supporting frame with the U-shaped
support and legrest is pushed to its rearmost position. A one-way,
spring latch for telescoping tubes is provided to secure the frame
from sliding forwardly from its storage position out of the
horizontal tubes of the chair and to limit its forward movement iin
working position. The latch permits free inward movement of the
assembly into storage under the seat.
Inventors: |
Pivacek; William J. (Elyria,
OH) |
Assignee: |
Invacare Corporation (Elyria,
OH)
|
Family
ID: |
23662476 |
Appl.
No.: |
05/419,485 |
Filed: |
November 28, 1973 |
Current U.S.
Class: |
297/423.22;
297/DIG.4 |
Current CPC
Class: |
A61G
5/12 (20130101); A61G 5/125 (20161101); A47C
7/5066 (20180801); A47C 7/506 (20130101); A47C
7/5062 (20180801); A61G 5/128 (20161101); Y10S
297/04 (20130101) |
Current International
Class: |
A47C
7/50 (20060101); A47C 7/00 (20060101); A61G
5/12 (20060101); A61G 5/00 (20060101); A47C
007/50 () |
Field of
Search: |
;297/423,429,430,431,432,439,DIG.4 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gilliam; Paul R.
Assistant Examiner: Dorner; Kenneth J.
Attorney, Agent or Firm: Bosworth, Sessions & McCoy
Parent Case Text
My co-pending application, Ser. No. 343,126, filed Mar. 20, 1973
discloses and claims the one-way latch for telescoping tubes, FIG.
7 herein, that is used in and with the invention disclosed and
claimed herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention lies in the field of chairs and wheelchairs having
footrests and legrests and more particularly to the matter of
storing or providing for storage of such rests.
2. Description of the Prior Art
Prior art chairs and wheelchairs often provide legrests and
footrests which are either movable to and from their working
position or are removable entirely when not in use. Those which are
movable from their working position without detachment from the
chair, enlarge the overall dimensions of the chair and add
awkwardness to moving the chair anywhere, or moving it to proximity
to beds and tables or through narrow doorways and passages. A
footrest or legrest removed from the chair requires storage space
as well as time and effort to move the footrest or the legrest from
the storage area to the chair and back again. The time and effort
is multiplied if the legrest or the footrest is lost or
mislaid.
Legrests for chairs and wheelchairs are known in the art but they
lack the "self-storing" capabilities of the present invention, or
they do not contribute to reducing the effective overall dimensions
of the chair when not in their working positions.
SUMMARY OF THE INVENTION
My invention in its preferred form comprises a self-storing
footrest and legrest assembly in combination with an invalid's
chair or wheelchair. The footrest is mounted for angular adjustment
on the telescopically sliding frame which is telescopically
received in lower tubular members of the side frames of the chair.
The frame is slidably movable from a rearward storage position to a
forward working position in front of the chair. The legrest is
mounted for restrained pivotal movement on a support member which
is slidably mounted on the sliding frame. When the frame is
extended forwardly of the chair, the legrest can be moved
independently to either an extended position for use or to the
storage position underneath the seat of the chair. Both the
footrest and the legrest are secured in the storage position
underneath the seat when the frame is slid into the side frame
tubes of the chair. A one-way spring latch for telescoping tubes is
used to secure the assembly from sliding off the chair and to keep
the assembly in storage or release it for use. The latch may also
be released to permit removal of the assembly from the chair.
Whereupon the support for the legrest may be slid off the rearward
ends of the frame.
An object of my invention is to provide a legrest and footrest
assembly for an invalid's or other chair or wheelchair that is
simple and economical in construction, may be used and enjoyed with
little manual effort, permits selective use of the footrest or
legrest and permits storage of one or both within the metes and
bounds of the chair.
Other objects of my invention will appear from the foregoing and
from the following description of, and claims for, my invention.
Claims
What is claimed is:
1. A self-storing foot and legrest assembly for a chair having
lower tubular brace members, said assembly comprising a frame
having legs telescopically received by said brace members and
movable therein forwardly out of, and rearwardly into said chair, a
footrest mounted on said frame, a support member slidably mounted
on said legs and extending rearwardly toward said chair and a
legrest mounted on said support member, said support member
comprising an inverted U-shaped tube having parallel arms and a
back portion extending between said arms with a tubular collar at
the end of each arm in sliding engagement with said legs, the arms
of said U-shaped tube being inclined upwardly and rearwardly toward
said chair with respect to said tubular collars, said legrest being
pivotally mounted on said back portion of said U-shaped tube.
2. In a chair having a seat and a pair of side frames with lower
hollow brace members, a self-storing foot and legrest assembly
comprising a footrest, a frame having legs telescopically received
by said lower brace members and longitudinally movable in said
lower brace members, said footrest being mounted on a lower forward
part of said frame, a support member slidably mounted on said legs
and extending rearwardly toward said chair, and a legrest pivotally
mounted on said support member and storable under said seat
independently of said frame, and said frame and footrest also being
storable in said chair under said seat, said support member
comprising an inverted U-shaped tube having parallel arms with a
tubular sleeve at the end of each arm, the arms of said U-shaped
tube being inclined upwardly and rearwardly toward said chair with
respect to said tubular sleeves, said tubular sleeves being
slidably engaged with said legs.
3. The assembly of claim 2 with latch means for holding said frame
in storage while said parts hold said legrest and support in
storage on said frame.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is the side elevation of a wheelchair having my foot and
legrest assembly with the footrest alone in its extended position
ready for use.
FIG. 2 is a fragmentary view of the lower front portion of the
chair of FIG. 1 showing the legrest in its extended position ready
for use.
FIG. 3 is a view corresponding to FIG. 2 showing both the footrest
and legrest slid rearwardly into the chair for storage therein.
FIG. 4 is a front elevation of the chair of FIG. 1.
Fig. 5 is an isometric detached view of the slidable frame member
upon which the legrest and footrest are mounted.
FIG. 6 is an isometric detached view of the slidable support for
the legrest.
FIG. 7 is a longitudinal section through one of the legs of the
sliding frame and the straight horizontal tubular brace in which it
is slidable, showing particularly the latch mechanism which limits
the normal relative motion between the frame and the tube.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now particularly to FIG. 1 and FIG. 4, there is shown a
wheelchair structure C having tubular metal side frames 10 and 11
which may be identical. Reference to side frame 10 as in FIGS. 1-3,
will suffice for both side frames unless otherwise noted. Frame 10
includes upwardly extending legs 13 and 14 and a conventional
armrest portion 17 with armrest 18. A lower brace member 20 is
firmly connected, as by welding, between legs 13 and 14 adjacent
their lower ends, and serves also as the sliding support for the
self-storing footrest and legrest assembly generally indicated at
22. A tubular backrest and seat supporting frame 25 is positioned
between and secured to side frames 10 and 11, and supports a
backrest 26 and a seat 28. Opposite sides of frame 25 are welded or
otherwise secured to legs 13 and 14 of side frames 10 and 11 as
indicated at 30 and 31, respectively.
Foot and legrest assembly 22 comprises footrest 33 which is
pivotally, but not freely, mounted on sliding frame member 40,
FIGS. 1-5, and legrest 34 which is pivotally, but not freely,
mounted on sliding support 35, FIGS. 1-6, which is slidably mounted
on frame 40. The straight legs 41 and 42 of frame 40 are
telescopically received in lower brace members 20: brace 20 of
frame 11 is obscured in the drawings. Frame 40 is movable
leftwardly and rightwardly relative to the chair as viewed in FIGS.
1-3.
As shown in FIGS. 5 and 7, legs 41 and 42 of frame 40 comprise
parallel hollow tubes having a free sliding fit and slidable in
brace tubes 20. The footrest supporting part 43 of frame 40 depends
from the forward ends of legs 41 and 42 and comprises forwardly
disposed vertical depending portions 44 brazed or welded to the
legs, and a horizontal, rearwardly extending, U-shaped portion 45
on the base 46 of which footrest 33 is secured for restrained
pivotal motion by capped plain bearings 36, FIGS. 1-4. The footrest
will tend to stay in a raised inclined position as in FIGS. 1 and 2
and may be gently but firmly pushed down as to the horizontal in
FIGS. 2 and 3.
Legrest 34 is snugly and pivotally mounted on crossmember 39 of
support member 35, FIGS. 1, 2, 3 and 6, by capped bearings 37
similar to bearings 36. The angle at which legrest 34 is placed
relative to the horizontal, can be adjusted according to the
patient's needs and comfort as shown, for example, in FIG. 2. When
not in use it can be pivoted counterclockwise, as from FIG. 2 to
FIGS. 1 and 3, to fit freely under seat 28.
Legrest support member 35 is slidably mounted on frame 40. Member
35 comprises an inverted U-shaped tube with short tubular sleeves
38 secured to the lower ends of each leg of the U which have a
fairly snug sliding fit on legs 41 and 42 of frame 40. The snugness
of the sliding fit does not impair positioning of the support along
the legs 41 and 42 with modest manual effort, but it is intended to
inhibit inadvertent sliding of the support that would interfere
with the comfortable support of the legs of the occupant. When
frame 40 is extended outwardly beyond the front of the chair, as
shown in FIG. 1, support member 35 can be moved manually from its
storage position of FIG. 1 to its working position in FIG. 2. When
it is desired to store the legrest and footrest, frame 40 can be
moved leftwardly as from the position of FIG. 2 to the position of
FIG. 3, or legrest support 35 alone may be moved leftwardly, as
viewed, relative to frame 40 as from FIG. 2 to FIG. 1 by sliding
support 35 with legrest 34 on the legs 41 and 42 while holding
frame 40 against movement.
Referring to FIG. 7, one-way movement spring latch 50-51 holds near
leg 42 of frame 40 from unwanted relative movement to the right as
viewed, at particular places while permitting free relative
movement of leg 42 to the left. Latch 50-51 comprises a plug 50
located in aperture 52 in tube 42 and urged radially outwardly by
stressed spring 51. So long as leg 42 is so related to strut 20
that the smooth interior of the strut confines plug 50, leg 42
slides freely in the strut. Strut 20, however, has two like
latching openings 54 and 55, smaller than aperture 52, into which
plug 50 may penetrate to about the thickness of the wall of the
strut, but is restrained from greater penetration by engagement
with the like camming surfaces 56 and 57 at the leftward, as
viewed, sides of openings 54 and 55. Camming surfaces 56 and 57
force plug 50 radially inwardly to free sliding contact with the
smooth cylindrical interior of strut 20 when leg 42 is moved
leftwardly from its position shown in FIG. 7. In the position shown
in FIG. 7, plug 50 forbids movement of leg 42 rightwardly unless
plug 50 is manaually depressed enough to clear the interior surface
of strut 20.
As shown in FIG. 1, latch openings 54 and 55 are spaced to inhibit
normal rightward movement of frame 40 beyond its fully extended
working position shown in FIGS. 1, 2 and 7, albeit depression of
plug 50 from its latched position of FIG. 7 permits withdrawal of
frame 40 and assembly 22 entirely from the chair.
When assembly 22 and frame 40 are moved into the storage position
in the chair, FIG. 3, then plug 50 enters the remote latching
opening 55 of strut 20, FIG. 7 and retains the assembly in its
stored position until released by depressing plug 50 inwardly of
opening 55. Although a modicum of leftward, as viewed, movement of
leg 42 is conveniently permitted by cam 57, FIG. 7, deleterious
leftward movement is inhibited by contact between collar 38 against
the forward open end 59 of strut 20 and the imminent or impending
contact of vertical parts 44 of frame 40 with collars 38.
More particulars of my latch mechanism are described and claimed in
my copending application. While I've suggested the sufficiency of
but one latch 50-51 in leg 42, the latch may be duplicated in leg
41 of frame 40 should that prove desirable.
While I have illustrated and disclosed a preferred form and
embodiment of my invention, other forms, changes and improvements
therein will occur to those skilled in the art who come to know and
understand my invention, all without departing from the essence and
substance thereof. Therefore, I do not want my patent to be
restricted to that which is specifically disclosed herein, nor in
any manner inconsistent with the progress by which my invention has
promoted the progress of the art.
* * * * *