Folding wheelchair with improved frame and suspension system

Details Folding wheelchair with improved frame and suspension system Folding wheelchair with improved frame and suspension system

1987-11-12

1989-08-29

Marmor, Charles A.

Land vehicles

Wheeled

Occupant propelled type

280 42, 280649, 297DIG4, A61G 502

Patent

active

048610569

ABSTRACT:
A folding wheelchair with an improved frame and suspension system provides a smooth and cushioned ride over uneven terrain. The rigid frame of the wheelchair has a double "X" configuration of cross-tubes to improve frame strength without adversely affecting the foldability of the frame. The suspension system of the wheelchair comprises a pair of suspension wings pivotally mounted to the chair frame by a pivot block. The rearward end of the suspension wing is rotatably attached to the wheel axle. The frontward end of the wing engages a spring or shock absorber which, in turn, attaches to the chair frame. The independent suspension of the wheels and relatively long pivotal axis of the wing from the wheel axle provides for better maneuverability of the chair and for a more comfortable ride. Additional cushioning of the occupant during travel over uneven terrain is provided by the shock-cushioning mechanism of the spring or shock absorber.

REFERENCES:
patent: 2462711 (1949-02-01), Barnett
patent: 2669289 (1954-02-01), Usher et al.
patent: 4078817 (1978-03-01), Ferguson et al.
patent: 4190263 (1980-02-01), Powers
patent: 4247127 (1981-01-01), Wilkes
patent: 4310167 (1982-01-01), McLaurin
patent: 4339013 (1982-07-01), Weigt
patent: 4341278 (1982-07-01), Meyer
patent: 4515383 (1985-05-01), Minnebaker
"Safety and Handling" Everest & Jennings, Wheelchair Prescription Series, Booklet No. 3, 5M Rev. 6/82.

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