Tractor with rear castor wheels

Details Tractor with rear castor wheels Tractor with rear castor wheels

2006-07-18

2006-07-18

Hurley, Kevin (Department: 3611)

Motor vehicles

Steering by driving

C016S03500D

Reexamination Certificate

active

07077220

ABSTRACT:
A hydrostatic agricultural tractor has front ground wheels mounted on the frame at fixed angles parallel to each other and parallel to a center line of the frame and rear ground wheels mounted on a respective castor, with each of the front ground wheels being driven by a respective drive motor which allows variable speed in both the first and second directions such that steering of the tractor is effected by a differential in speed between the front wheels with the rear wheels following the steering in a castoring action. A pair of damper cylinders is provided each connected between a bracket on a rear axle of the frame and a lever in the castor plane of the castor so as to provide a damping force tending to restrict rotation of the respective second wheel about the respective vertical pivot axis with the damping force at a maximum value when the rear wheels are parallel to the center line in either the forward or reverse directions.

REFERENCES:
patent: 2367993 (1945-01-01), Bishop
patent: 2379170 (1945-06-01), McDaniel
patent: 2557275 (1951-06-01), Geisse
patent: 2796140 (1957-06-01), Knolle
patent: 3075233 (1963-01-01), Lorenz
patent: 4154451 (1979-05-01), Young
patent: 4209963 (1980-07-01), Linn
patent: 4320810 (1982-03-01), Hillmann et al.
patent: 4363374 (1982-12-01), Richter et al.
patent: 5221100 (1993-06-01), McNutt
patent: 5335739 (1994-08-01), Pieterse et al.
patent: 6213218 (2001-04-01), Miller
patent: 6659491 (2003-12-01), Green

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