Land vehicles – Wheeled – Occupant propelled type
Patent
1987-09-25
1989-03-14
Mitchell, David M.
Land vehicles
Wheeled
Occupant propelled type
188 2F, 280243, 280246, 280255, 297DIG4, B62M 116
Patent
active
048119644
ABSTRACT:
A wheelchair propelled by rowing action includes a wheelchair frame with a pair of large main rear wheels connected by an axle, a rowing lever pivotally connected to the frame, a steering shaft with a handlebar grip mounted coaxially within the rowing lever and connected by a universal joint to a steering linkage connected to caster brackets mounting small front wheels, a pair of ratcheted sprockets mounted on the axle, a pair of sprocket chain segments connected by cables through pulleys to the rowing lever such that pulling and pushing of the rowing lever alternately causes driving engagement of one of the ratchets with the axles for propulsion and causes the other to slip. The leverage exerted by the rowing lever on the ratcheted sprockets is adjustable.
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Mitchell David M.
Watts Charles R.
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