Wheelchair manual drive mechanism

Details Wheelchair manual drive mechanism Wheelchair manual drive mechanism

1989-12-26

1991-08-06

Marmor, Charles A.

Land vehicles

Wheeled

Occupant propelled type

74413, 74421R, 297DIG4, B62M 114

Patent

active

050371207

ABSTRACT:
A hand operated propulsion drive mechanism for a wheelchair which has a driven gear (20) attached to the wheel of the wheelchair. A drive gear (26) is rotatably mounted to a support arm bracket (30) and intermeshes teeth with the driven gear. A hand crank (36) with a handle (40) allows a disabled person to propel the wheelchair by rotating the handle. A protective disc (38) covers the drive gear and also becomes part of the hand crank further allowing adjustment of the rotational radius of the drive using a slot (46) and removable mounting hardware. A second embodiment adds additional drive gears (26') to relocate the hand crank at different positions and the support arm bracket (30') is wide enough to cover the gears.

REFERENCES:
patent: 292179 (1884-01-01), Riley
patent: 2572149 (1951-10-01), Hind et al.
patent: 3253837 (1966-05-01), Johnson
patent: 3975969 (1976-08-01), Osborn et al.
patent: 4274650 (1981-06-01), Gilles
patent: 4274651 (1981-06-01), Dumont

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