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US 4,108,449 AGranted
Stair-climbing wheelchair
OwnerThomas J. Rhodesinventor
Life of this patent
Estimating the term…
Abstract
A wheelchair which has a seat, back and foot and leg supporting structure in which there are main and auxiliary wheels for supporting the body of the wheelchair when it is operating on a substantially level or smooth surface and in which there is climbing and descending means in the form of a flexible and pliable wheel which is brought into operating position when it: is desired to climb or descend a staircase, or when the wheelchair is moving over a very rough surface.
Claims14
A wheelchair, the combination of:
- (a) a body having a seat structure;
- (b) main wheels and secondary wheels mounted on said body for supporting said body while said wheelchair is travelling over a relatively even surface;
- (c) climbing and descending means for said body normally in a non-operating position;
- and
- (d) means for raising said main wheels rearwardly relative to said body and for moving said climbing and descending means into operating position whereby said body is supported by said main wheels and said climbing and descending means for enabling said wheelchair to climb or descend.
2 more elements
In a wheelchair, a combination of:
- (a) a body having a seat structure and a foot and leg support pivoted thereto;
- (b) main wheels for supporting said body;
- (c) main wheels support means connected to said wheels and said body whereby said main wheels may be moved from a normal position in which the axis of said main wheels is below said seat structure, in which position said wheelchair operates on a substantially level surface into a position in which the axis of said main wheels is positioned above said seat structure, in which position said parts are arranged for climbing or descending;
- (d) climbing and descending means mounted on said foot and leg support;
- (e) means for swinging said foot and leg support upwardly relative to said seat structure to bring said climbing and descending means into climbing and descending position;
- and
- (f) means for operating said climbing and descending means to cause said wheelchair to climb or descend.
4 more elements
Dependencies are inferred from the claim text.