Stair-climbing wheel utilizing an involute curve configuration

Details Stair-climbing wheel utilizing an involute curve configuration Stair-climbing wheel utilizing an involute curve configuration

1985-06-24

1987-06-23

Love, John J.

Land vehicles

Step or abutment ascending type vehicle

With spider-type engaging means

180 71, 180 82, 280 4727, 301 41R, 305 1, B62B 502, B62B 902

Patent

active

046747575

ABSTRACT:
A wheel for use with a variety of devices for moving a load up or down a series of stairs is disclosed, which wheel is comprised of a plurality of lobes like teeth on a gear. Each lobe has two surfaces which are symmetrical around a lobe center line, with each surface being made up of a portion of an involute curve defined by a circle having a particular radius. The involute curves making up the surfaces of each lobe mirror each other on opposite sides of the center line and intersect to form the lobe at the largest radii of the portions of the involute curves making up the surfaces of the lobe. The wheel may be made to specifications allowing exact fit on a particular size stairstep and a properly fitting wheel will move in a close approximation of a straight line parallel to the staircase incline as it moves up a flight of stairs.

REFERENCES:
patent: 2633363 (1953-03-01), Marshall
patent: 2736564 (1956-02-01), Loam et al.
patent: 2742973 (1956-04-01), Johannesen
patent: 2790503 (1957-04-01), Kopczynski
patent: 3058754 (1962-10-01), Whitaker
patent: 3178193 (1965-04-01), Grogan
patent: 3214184 (1965-10-01), Kemm
patent: 3283839 (1966-11-01), Brown et al.
patent: 3326563 (1967-06-01), Whitaker
patent: 3515401 (1970-06-01), Gross
patent: 4542918 (1985-09-01), Singleton

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