Wheel chair abstract
A wheel chair seat comprised of a one piece rigid configuration
that offers stable support allowing controlled height seating and
having a special cushion comprised of varying density foam sections
that assist the user therapeutically in preventing ulcerated areas
on the buttocks. Apparatus is provided for pivoting the support
with the cushion attached thereto as the wheel chair is folded.
Wheel chair claims
We claim:
1. A folding wheel chair including wheels, folding cross frames
between the wheels of the chair, and tubular side frame members
forming parts of the cross frames, a rigid wheel chair seat comprising
a single rigid support having a flat bottom member and raised side
edges, said cross frames being in a plane at right angles to the
wheels, said flat bottom member having an underside,
first structural members attached to the underside of said flat
bottom member, said first structural members having end portions,
second structural members having end portions, connection means
for pivotally and slidably connecting said second frame members
to said first frame members near the center of said support, said
connection means including a pin in each of said second structural
members for engaging a slot in each of said first structural members,
and means located at the outer end portions of said first and second
structural members for pivotably and releasably securing said structural
members to said tubular side frame members,
wherein said structural members pivot about said connection while
said outer end portions remain secured to said tubular side frame
members when said seat is pivoted from a horizontal seating position
to a vertical folded position in which said seat is generally parallel
with and between the wheels of the wheel chair.
2. In the wheel chair of claim 1, a cushion, said cushion having
areas of different configurations and densities providing for maximum
comfort and avoiding discomfort,
the cushion being mounted on the seat and held in place by the
raised side edges.
3. In the wheel chair of claim 2, the areas of different densities
including coccyx, perineum, trochanter, and thighs.
4. The wheel chair of claim 2 including inclined edges on the support,
the cushion having an edge configuration matching the support and
means securing the cushion from sliding or shifting.
5. The wheel chair of claim 1 including means adjustably to raise
and lower a portion of the support.
6. In the wheel chair of claim 1 including hooks on the outer ends
of said first and second structural members, and means for locking
the hooks to the tubular side frame members of the wheel chair.
7. The wheel chair of claim 6 wherein the hooks are adjustable
to vary the seat height.
8. The wheel chair of claim 7 wherein said hooks are threaded and
include a threaded collar to secure the bight of the hook to a respective
tubular frame member.
9. The wheel chair of claim 8 including a resilient washer for
each hook placed to absorb road shock.
Wheel chair description
BACKGROUND AND SUMMARY OF THE INVENTION
It is well known that persons confined to a wheel chair for lengths
of time are susceptible to areas of ulcerations because of the restricted
blood flow in specific areas. It is the object of the present invention
to eliminate this ulcer problem by means of a simple rigid base
seat support that is the receptacle for a special cushion that is
custom formulated with various areas of density foams that re-distribute
pressure in areas of the buttocks that normally cause restrictive
blood flow, causing ulcerated conditions. A wheel chair patient
can be tested and a pattern of high pressure areas can be printed
as a pattern to formulate the cushion needed to custom protect a
specific person.
The therapeutic wheel chair seat fits conveniently and can be mounted
in most wheel chairs. It has a simple pivot arm construction that
allows the wheel chair to be folded without interference, with the
cushion in place.
The structure includes an adjustable screw knob for height adjustment
for body stature to accommodate various size persons, and also has
cushioning pads that additionally absorb shock from the wheel chair
riding on rough surfaces.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view in front elevation illustrating the invention
mounted in a wheel chair;
FIG. 2 is a perspective view illustrating the seat structure removed
from the wheel chair;
FIG. 3 is a view similar to FIG. 2 illustrating the invention in
a wheel chair partially folded;
FIG. 4 shows the pivot latch with spring plunger pin;
FIG. 5 shows the pivot latch with knob type screw;
FIG. 6 is a perspective view of the seat support with lifting plate
attached.
FIG. 7 is a sectional view illustrating the spring washer pivot
for the lifting plate;
FIG. 8 is a plan view of the composite cushion;
FIG. 9 is a front view of the composite cushion;
FIGS. 10 and 11 are views of the seat support folding frame members;
and
FIG. 12 is a view partly in section, showing a modified hook bolt.
PREFERRED EMBODIMENT OF THE INVENTION
In FIGS. 1 and 2, a conventional wheel chair is shown in broken
lines. Since this type of wheel chair is well known, it is believed
that little further explanation with relation to this wheel chair
is necessary, but it is of the type which has a scissors frame 10
with pivot 12 for folding the same from a useful condition to a
condition wherein the wheels thereof approach each other as closely
as possible. Also, it is provided with generally horizontal tubular
frame members 14 and 16. The seat of the present invention is mounted
on these tubular members.
The seat which is the principal subject matter of the present invention
is generally indicated by the reference character 18 and it is provided
with a generally flat seat support or bottom part 20 with inclined
raised edges 22 and 24 having rims or the like 26, 28. This support
is for the cushion 30 which will be described more particularly
hereinafter but as shown in FIGS. 1 and 3 conforms to and nests
into the frame or support member 20, 22, 24, etc.
A pair of box-type structural members which are indicated at 32
and 34 (see FIG. 2) are bolted to the bottom of the member 20 by
means of bolts such as shown at 36. These bolts 36 extend into the
support 20 through elevated slots 37, FIG. 11, so that the members
32, 34 can be adjusted laterally relative to support 20, and seat
cushion 30 for the accommodation thereof to different sizes of wheel
chairs. Channel-shaped frame members 38, 40 are pivoted as at 42
(FIG. 2) in slots 44 in members 32 and 34 and complete the support
for the seat inasmuch as frame members 32, 34 extend only part way
across the bottom support 20. The reasons for the slots 44 is to
maintain centralization of the support, for instance, parts 20,
22, 24 (see FIG. 3) when adjustment is made.
The frame member 32 and its cooperating member 38 pivoted thereto
terminate in downwardly opening hooks 46, 48 that are received on
the tubular members 14 and 16, this being illustrated with respect
to tubular member 14 (FIGS. 4 and 5) and are locked in place by
spring-pressed heads 50 of screws 52 which may be screwdriver operated
or hand operated as at 54 in FIG. 5, to lock the parts together.
Now considering FIGS. 1, 2 and 3, it will be seen that when the
wheel chair is folded from its fully operable position (FIG. 1)
to the part-way folded representations in FIGS. 2 and 3, the pivot
at 42 allows the frame 32, 38 to break, placing the seat 18 in a
vertical or upright position between the wheels of the folded wheel
chair so that the seat under consideration is easy to fold, etc.
Referring now to FIGS. 6 and 7, there is a plate 60 which can be
mounted in any way desired interposed between the support 20 and
members 32, 34 to support the seat by a pivot arrangement including
a headed pin indicated at 64 working in a tapered hole 66, but other
kinds of pivots can also be used, the structure shown in FIG. 7
utilizing a domed apertured spring washer 68 holding the parts in
a tension position. This construction utilizes screws or bolts 70
to work upon the rear end of support 20 as shown in FIG. 6 to elevate
the same, or conversely to allow the same to drop, all looking toward
the comfort of the user.
An example of the cushion is shown in FIGS. 8 and 9 and reference
is made to areas such as at 62, 74, 76, 78, 80, etc., which may
be made of different densities to suit the special needs of the
buttocks of the particular person using the wheel chair. These areas
may be of different shapes and sizes and depths. An assessment system
has been developed to determine each user's particular needs. The
measurements of the user's pressures which exist in these areas
between the body and the seat are ascertained. Reaction to heat
generation is determined and the material is then chosen which best
meets the user's needs, with a view towards avoiding and using different
compositions of materials in the makeup of the cushion part of the
seat while maintaining normal seat height, eliminating the use of
cushions which raise the seat height out of normal range, and which
in turn result in the patient being improperly fitted in the chair.
This concept aids in the prevention of decubitus ulcers which may
occur in persons dependent on wheel chairs and the composition of
the cushion materials is determined by scientifically evaluating
the patient' s sitting pressures in the areas of:
A. Ischial Tuberosity
B. Coccyx
C. Perineum
D. Trochanger and Thighs
E. Popliteal
The cushions may be held against shifting by "Velcro".
FIG. 12 shows an alternate supporting device for the seat. A threaded
hook bolt 82 is held in place over tubular member 14 with a threaded
collar 84 which provides accommodation for different sizes of tubular
members. A thumb nut 86 rests on frame member 38, for instance,
and enables raising or lowering the seat without plate 60. By placing
a resilient washer 88 between the nut 86 and member 38, for instance,
riding shock is absorbed to some degree. |