Stair-climbing wheelchair with stair step sensing means

Details Stair-climbing wheelchair with stair step sensing means Stair-climbing wheelchair with stair step sensing means

1985-10-01

1987-06-23

Love, John J.

Motor vehicles

Special driving device

Stepper

180 922, 180 928, 180907, 280 522, 280DIG10, B62B 502, B62B 902

Patent

active

046745840

ABSTRACT:
A stair-climbing wheelchair having a sensor at the front end thereof for sensing the presence of a stair step or an inclined ramp. The sensor emits signals which reflect from a surface and to a receptor in the sensor, the receptor being coupled to a microprocessor which determines not only the linear distance traveled by the wheelchair in a forward direction, but also the height of a stair step. Thus, when the tracks are down, a microprocessor associated with the sensor will shut off the drive motors to the tracks if the slope of the stairway is too great when the tracks are down. In such a case, the wheelchair backs away from the stairway and does not go down it. If the slope is less than a predetermined value, such as 30.degree.-35.degree., the wheelchair can move down the stairway in the normal fashion.

REFERENCES:
patent: 3133742 (1964-05-01), Richison et al.
patent: 3625303 (1971-12-01), Cameron
patent: 4513833 (1985-04-01), Sheldon
patent: 4564080 (1986-01-01), Pagett
patent: 4566707 (1986-01-01), Nitzberg

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