Powered wheelchair ramp for minivans

Details Powered wheelchair ramp for minivans Powered wheelchair ramp for minivans

1997-05-21

1999-02-16

Bucci, David A.

Material or article handling

Self-loading or unloading vehicles

Conveyor

14 713, 414921, B60P 143

Patent

active

058713298

ABSTRACT:
A powered wheelchair ramp includes a drive mechanism having a gear, a cam, and a lever arm keyed to a common shaft to prevent relative motion among these elements. An electric motor drives the gear through a clutch and the lever arm raises or lowers a folding ramp. Energy storage device engage the cam through a follower for storing energy as the ramp is lowered. The energy storage device also damps the motion of the ramp. When the ramp is raised, the energy storage device aids lifting the ramp. The torques applied to the common shaft are such that the net torque in either direction about the shaft is below a predetermined amount. The result is that the ramp can be raised and lowered easily, even by a single person in a wheelchair sitting beside the ramp. The clutch is released for manual operation and can engage at any point for powered operation.

REFERENCES:
patent: 2541288 (1951-02-01), Rice
patent: 3500486 (1970-03-01), Le Clear
patent: 3874527 (1975-04-01), Royce
patent: 4922568 (1990-05-01), Hageman
patent: 5391041 (1995-02-01), Stanbury et al.
patent: 5649803 (1997-07-01), Bennett
patent: 5676515 (1997-10-01), Haustein

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