Wheelchair

Details Wheelchair Wheelchair

1989-10-20

1991-06-11

Hill, Mitchell J.

Motor vehicles

Steering by driving

Independently operable drive motors

180 651, 180 791, 180907, 2803041, A61G 504, B62D 504

Patent

active

050224760

ABSTRACT:
A wheelchair having a pair of electrically driven drive wheels, a pair of power-operated swivel steering wheels which rotate about a vertical steering axis, and a manually-actuated lever. Each steering wheel has its own motor for adjusting the steering angle of the steering wheel. The steering lever connects to a mechanical-electrical steering angle generator which produces an electrical signal which is dependent on the angular position of the steering lever. The signal is fed into an electrical device which controls both steering wheel motors to adjust the steering angle of the steering wheels. The electrical device produces two adjustment signals, one for each wheel, which are inversely proportional to the radius of the turning curve. The steering angle can be set at any angle to up to 360.degree. thereby providing substantial maneuverability for the wheelchair. The steering angles are precisely controlled to satisfy the laws of steering so that a lateral jamming of the steering wheels and increased wear on the tires is avoided.

REFERENCES:
patent: 4059786 (1977-11-01), Jones et al.
patent: 4157123 (1979-06-01), Rodaway
patent: 4341278 (1982-07-01), Meyer
patent: 4387325 (1983-06-01), Klimo
patent: 4483405 (1984-11-01), Noda et al.
patent: 4634941 (1987-01-01), Klimo
patent: 4667136 (1987-05-01), Bell
patent: 4805712 (1989-02-01), Singleton

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