Four wheel steering apparatus

Details Four wheel steering apparatus Four wheel steering apparatus

1993-01-29

1994-02-22

Hill, Mitchell J.

Land vehicles

Wheeled

Running gear

280 99, 280100, B62D 715

Patent

active

052880915

ABSTRACT:
A four wheel steering system for a vehicle which significantly reduces or eliminates scrubbing of the outside tires. A preferred embodiment is specially adapted for use on riding lawn mowers, and includes a longitudinally moveable cam plate having a pair of cam slots formed therein, each slot engaging an individual steering arm for separately steering each rear wheel. The cam plate is coupled to a sector gear which reciprocates in response to left and right hand movement of a steering wheel, with the sector gear interconnecting the front and rear wheel steering mechanisms. The slots in the cam plate are specially configured to vary the turning angles of the rear wheels so that the wheels turn through varying angles, thereby reducing scrubbing to an acceptable level. In a preferred embodiment, all four wheels may be calibrated to turn about a single point, thereby completely eliminating scrubbing.

REFERENCES:
patent: 1228980 (1917-06-01), Smith
patent: 1585753 (1926-05-01), Arato
patent: 2234888 (1941-03-01), Blagden
patent: 2319880 (1943-05-01), Pulleyblank
patent: 2411570 (1946-11-01), Hawkins
patent: 3596730 (1971-08-01), Cecce
patent: 4295657 (1981-10-01), Sano et al.
patent: 5048853 (1991-09-01), Trefz et al.

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