U.S. patent number 3,896,891 [Application Number 05/393,449] was granted by the patent office on 1975-07-29 for modular motorized wheel chair.
This patent grant is currently assigned to Stainless Medical Products, Inc.. Invention is credited to Howard Carson, Edward W. Miltenburg, Donald L. Whetstine.
United States Patent |
3,896,891 |
Miltenburg , et al. |
July 29, 1975 |
MODULAR MOTORIZED WHEEL CHAIR
Abstract
The specification discloses a motorized wheelchair which can be
quickly and easily disassembled into separate lightweight
components. The separate components can be conveniently stacked to
minimize space requirements when transporting the chair from one
location to another.
Inventors: |
Miltenburg; Edward W. (Newport
Beach, CA), Whetstine; Donald L. (Costa Mesa, CA),
Carson; Howard (Costa Mesa, CA) |
Assignee: |
Stainless Medical Products,
Inc. (Santa Ana, CA)
|
Family
ID: |
23554752 |
Appl.
No.: |
05/393,449 |
Filed: |
August 31, 1973 |
Current U.S.
Class: |
180/6.5; 180/907;
297/DIG.4; 318/55 |
Current CPC
Class: |
A61G
5/045 (20130101); A61G 5/0875 (20161101); A61G
5/1091 (20161101); A61G 5/0891 (20161101); A61G
5/1054 (20161101); Y10S 180/907 (20130101); A61G
2203/14 (20130101); Y10S 297/04 (20130101) |
Current International
Class: |
A61G
5/00 (20060101); A61G 5/04 (20060101); A61G
5/08 (20060101); A61G 5/10 (20060101); A61g
005/04 () |
Field of
Search: |
;180/6.5,DIG.3
;297/DIG.4,300,301,416,423,429,440,443 ;318/55,58,139 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wood, Jr.; M. Henson
Assistant Examiner: Church; Gene A.
Claims
We claim:
1. A wheelchair comprising:
a left side module including a left frame, a left rear drive wheel
having a horizontal axis of rotation and a castor mounted front
wheel;
a first motor and a means for connecting the output of said first
motor to said left rear drive wheel;
a right side module including a right frame, a right rear drive
wheel having a horizontal axis of rotation and a castor mounted
front wheel;
a second motor and a means for connecting the output of said second
motor to the right rear drive wheel;
a seat comprised of a bucket shaped back module and a bucket shaped
bottom module;
means for attaching said seat to said left and right frames so as
to enable said seat to be easily and quickly detached from said
frames said means comprising:
a pair of substantially vertical elongated projections on the
bottom of said bucket shaped back module, said projections being
spaced apart so as to be substantially coplanar with said left and
right frames, and;
a member of said left frame having an opening adapted to receive
one of said bucket seat back projections, and;
a member of said right frame having an opening adapted to receive
the other of said bucket seat back projections;
at least one pair of substantially vertical elongated projections
on the bottom of said bucket shaped bottom, said projections being
spaced apart so as to be substantially coplanar with said left and
right side frames, and;
a member of said left frame having an opening adapted to receive
one of said bucket seat bottom projections;
a member of said right frame having an opening adapted to receive
the other of said bucket seat back projections;
a battery support platform and means for attaching said battery
support platform to said left and right frames so as to permit said
battery support platform to be easily and quickly removed from said
frames.
2. The apparatus recited in claim 1 wherein said means for
attaching said battery support platform comprises:
a pair of elongated substantially horizontal projections on said
support platform and a member of said left frame having an opening
adapted to receive one of said projections and a member of said
right frame having an opening adapted to receive the other of said
projections.
3. A wheelchair comprising:
a left side module including a left frame, a left rear drive wheel
having a horizontal axis of rotation, and a castor mounted front
wheel;
a right side module including a right frame, a right rear drive
wheel having a horizontal axis of rotation and a castor mounted
front wheel;
a seat comprised of a back module and a bottom module;
means for attaching said seat to said left and right frames so as
to enable said seat to be easily and quickly detached from said
frames, said means comprising:
a pair of substantially vertical elongated projections on the
bottom of said back module, said projections being spaced apart so
as to be substantially coplanar with said left and right frames
and;
a member of said left frame having an opening adapted to receive
one of said back module projections, and;
a member of said right frame having an opening adapted to receive
the other of said back module projections;
at least one pair of substantially vertical elongated projections
on the bottom of said bottom module, said projections being spaced
apart so as to be substantially coplanar with said left and right
side frames, and
a member of said left frame having an opening adapted to receive
one of said bottom module projections;
a member of said right frame having an opening adapted to receive
the other of said bottom module projections.
Description
BACKGROUND OF THE INVENTION
A disabled individual who has temporarily or permanently lost the
use of his legs must usually depend upon a mechanical substitute,
such as a wheelchair, to move himself about. Most prior art
wheelchairs are manually operated; and require considerable
exertion to negotiate minor hills or travel distances. Moreover, in
a situation where the individual has both a leg and arm impairment,
the manually operated wheelchair can be quite difficult to propel.
As a consequence, a number of motor powered wheelchairs hav been
marketed. These vehicles normally utilize two separate driving
motors. One of the drive motors is connected to the left rear wheel
by a pulley and the other is connected to the right rear wheel in
the same manner. Steering is effected by an electronic system under
control of the operator. The system applies power simultaneously to
both wheels to move the chair forward, backward, or to rotate the
chair in a circle. Power can also be applied to one wheel alone to
turn the vehicle left or right.
While the conventional motorized wheelchair obviates the
aforementioned problems of the manually powered device, it has
several shortcomings. Paramount among these is the additional
weight. Such wheelchairs are typically designed to fold up so that
they can be transported in the trunk of an automobile or the back
of a station wagon. But the additional weight imposed by the
battery, motors and structural members make it difficult for most
persons to lift or move them about. Consider for example, a typical
situation involving a middle-aged wife having an invalid husband.
Whenever they travel by auto, they must always seek the aid of a
third person to lift the folded motorized chair "IN" and "OUT" of
the auto. What is actually desired is a motorized wheelchair which
can be easily disassembled into lightweight components for
transportation and then easily reassembled.
A secondary disadvantage of the conventional folding wheelchair is
discomfort. In order to facilitate its collapsibility, it has been
necessary to make the seat portion relatively flat so as to
severely limit the amount of contour and padding. Considering that
persons who are confined to wheelchairs spend must of their life in
this seat, the importance of comfort will be readily
appreciated.
Accordingly, a primary object of the present invention is to
provide a modular wheelchair which can be easily assembled and
disassembled.
A further object of the present invention is to provide a
wheelchair which consists of a number of modular components, all of
which are of a weight and size such that they can be easily lifted
and managed by persons of moderate strength.
A further object of the present invention is to provide a modular
wheelchair having a comfortable and contoured seat.
Other objects and advantages of the present invention will be
obvious from the detailed description of a preferred embodiment
given herein below.
SUMMARY OF THE INVENTION
The aforementioned objects are realized by the present invention
which comprises a wheelchair consisting of five primary modules,
namely; a left side module including one drive motor and drive
wheel, a right side module including a drive motor and drive wheel,
a bottom platform including a battery and frame for its retention,
a bucket seat bottom and a bucket seat back. The bottom platform as
well as the bucket seat back and bottom each include protruding
members which are adapted to slip into accordant openings in the
two side modules.
DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a perspective view of the modular wheelchair as it
would appear when fully assembled.
FIG. 2 shows an exploded perspective view of the chair illustrating
the various modules and how they connect.
DESCRIPTION OF A PREFERRED EMBODIMENT
Adverting to the drawings, and particularly FIG. 2, a preferred
embodiment of the invention comprises a wheelchair, which includes
five separate modular components, namely; a left side module, a
right side module, a battery support frame, a seat back and a seat
bottom. The left side module is comprised of a frame 1, a drive
wheel 2, a castor mounted front wheel 3, a motor 4 and drive pulley
5 which is tightened by the overcenter toggle arrangement 6 via
hand lever 7, and rotable foot rest 8. The right side module
includes the corresponding elements 11-18 respectively. The battery
support frame includes platform 21 which is attached to the two
frame members 20 and 21. Both the back and bottom of seat
components 22 and 23 have recessed padded depressions (24 and 25
respectively) to effect what is commonly known as a bucket
seat.
Each of the modular components include connecting elements which
function to interlock the modules so as to form the assembled
wheelchair shown in FIG. 1. For example, the seat bottom 23, has
two projections 30 and 31 which are adapted to slip into the holes
32 and 33 respectively of the side frames 1 and 11. The yoke 34 on
the left side seat bottom 23 is spaced to straddle the frame 1 at
the point indicated by the numeral 35. A corresponding yoke on the
right side of seat bottom 23 (not shown) functions to straddle the
frame 11 at the point indicated by numeral 36. The projections 40
and 41 on the bottom of the seat back 22 are spaced to slip into
the accordant holes 42 and 43 respectively. The projections 50 and
51 on bar 21 are adapted to slip into the openings 52 and 53, the
battery support frame being restricted from lateral motion by the
flanges 54 and 55 which slightly overhang the side frames 1 and 11
as indicated by the numeral 60.
The ease of assembly and disassembly will be evident from the
drawings. There are no knobs to turn or screws to tighten. The seat
back 22 and seat bottom 23 can be removed by simply lifting
upwards. The battery support and battery can be removed pulling
forward to clear projections 50 and 51 and then upwardly.
An experimental unit has been fabricated using hollow, stainless
steel framework. Exclusive of the battery, no modular component
weighed more than 22 lbs. Each module could be easily lifted and
handled by a person of moderate strength. Moreover, the modular
coupling is designed so that each module is essentially thin and
flat. The modules can be stacked - one on top of the other with a
total height of less than 18 inches.
As previously mentioned, the conventional folding wheelchair cannot
utilize the deep comfortable bucket style seats. Nor can they be
easily disassembled - but must generally be moved as a complete
unit. The present invention, on the other hand, is easily taken
apart and assembled. When it is assembled, as shown in FIG. 1, it
is considerably more comfortable than the flat, lightly padded
foldable wheelchairs.
It will be evident that the basic concept of the invention is not
limited to motorized wheelchairs. It could be used with equal
applicability on any manually operable device which, on occasion,
must be transported from place to place. Nor are the teachings of
the invention restricted to the particular modular arrangement
shown. Moreover, the modules may be made to connect to one another
in a variety of ways other than in the particular manner
demonstrated. Thus, although a preferred embodiment has been shown
and described, it will be understood that the invention is not
limited thereto, and that numerous changes, modifications, and
substitutions may be made without departing from the spirit of the
invention.
* * * * *