Climbing and descending vehicle

Details Climbing and descending vehicle Climbing and descending vehicle

1987-06-01

1988-12-13

Mitchell, David M.

Land vehicles

Step or abutment ascending type vehicle

With spider-type engaging means

180 65, 180 82, 280242WC, 280DIG10, B62B 906

Patent

active

047905484

ABSTRACT:
A stair-climbing and descending vehicle is disclosed, comprising a frame and a pair of transverse, co-axial, power-driven axles, each rotatably carrying a spider assembly at its outer end. Each spider has at least three wheels, one at each equi-spaced extremity of its radial arms. Each axle drives either the spider or the associated wheels through a differential gearing. When climbing a stairway, the spiders are rotated immediately when the wheels are prevented from rotating by encountering a stair riser. The differential also serves to safety and smoothly descend the stairs. The vehicle is adapted for use as a wheelchair, in which case a chair-shifting device is provided to shift the center of gravity of the vehicle, rearwardly.

REFERENCES:
patent: 3241848 (1966-03-01), Flory
patent: 3283839 (1966-11-01), Brown et al.
patent: 3580344 (1971-05-01), Floyd
patent: 4457526 (1984-07-01), Persson
patent: 4614246 (1986-09-01), Masse
patent: 4645222 (1987-02-01), Hester
patent: 4709772 (1987-12-01), Brunet

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