WHEEL CHAIR PROPULSION SYSTEM

摘要

A wheel chair propulsion device particularly for use by quadriplegics that includes an annular ring smaller in diameter than the large wheel of a conventional wheel chair and having a plurality of spaced apart recesses in a surface thereof. The ring is fastened to the wheel of the wheel chair in co-axial relation therewith and spaced outward therefrom. A lever is pivotally mounted on the wheel chair axle and an opposite end of the lever projects above the conventional arm rest on the wheel chair. A drive mechanism is mounted on the lever arm and positively engageable with the annular ring for rotating the same and disengageable therefrom to allow free rotation of the wheel. The drive mechanism comprises a lug movable into and out of the recesses in the ring in response to movement of the lever means in a direction transverse to the plane of the wheel and resilient compressible means which is compressed by movement of the lever in a direction to move the lug into a recess in the ring.