Wheelchair with variable ratio propulsion

Details Wheelchair with variable ratio propulsion Wheelchair with variable ratio propulsion

1986-05-19

1987-07-28

Mitchell, David M.

Land vehicles

Wheeled

Occupant propelled type

280244, 280246, 280238, B62M 114

Patent

active

046827846

ABSTRACT:
A wheelchair hand propelled by the occupant. Levers on the sides in juxtaposition with the main wheels of the wheelchair are rotatable in the forward-backward direction about the main wheel axle as a fulcrum. A plurality of concentric ratchet rings affixed to each of the main wheels provides engagement for a discrete one of a plurality of pawls associated with each of the levers. The plurality of pawls is distributed progressively circumferentially about a shaft associated with each of the levers, and means are included to rotate the shaft to bring a discrete one of the pawls into operative relationship with a selected one of the concentric ratchet rings, thereby providing a selectable propulsion ratio. The ratchet teeth are oriented such that the pawls slide over them when the levers are pulled backward, but engage firmly when the levers are thrust forward.

REFERENCES:
patent: 4005611 (1977-02-01), Jeffries
patent: 4354691 (1982-10-01), Saunder et al.
patent: 4358126 (1982-11-01), Mitchell et al.
patent: 4447068 (1984-05-01), Brooks

Affiliated with

Also associated with

Rating

Wheelchair with variable ratio propulsion does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Wheelchair with variable ratio propulsion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wheelchair with variable ratio propulsion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2031442