Land vehicles – Wheeled – Occupant propelled type
Patent
1990-01-05
1991-04-16
Marmor, Charles A.
Land vehicles
Wheeled
Occupant propelled type
280245, 280254, 74109, 74131, B62M 116
Patent
active
050076558
ABSTRACT:
Disclosed is a wheelchair having a pair of levers along its opposite sides connected with sprockets on drive wheels. In one form, each lever is connected to its sprocket by a rack. The drive wheels have a clutch enabling the power stroke of the lever to drive the wheels through the rack-and-pinion engagement, yet permitting the sprocket to rotate in the reverse direction freely upon the return stroke of the lever. The rack includes an arcuate extent void of teeth to enable disengagement of the drive connection between the lever and sprocket whereby the wheels may move freely in either direction. In another form, a chain interconnects the lever and a return spring connected to the wheelchair frame. The chain has an extent void of pins to enable disengagement of the drive connection between the lever and sprocket, whereby the sprocket and, hence, drive wheel are free to rotate in either direction. A speed change mechanism is employed to vary the torque applied to the sprocket by the lever.
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Bompey Mitchell
Marmor Charles A.
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