Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1981-06-22
1983-08-16
Pekar, John A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
B62D 508
Patent
active
043986161
ABSTRACT:
A steering system for a construction vehicle operable to control the position of a pair of front wheels and a pair of rear wheels relative to the frame of the vehicle includes a hydraulic fluid circuit for distributing hydraulic fluid. A hydraulic cylinder is connected to each of the wheels for turning same in a desired manner. A steering wheel is interposed in the hydraulic fluid circuit for selectively directing hydraulic fluid to the cylinders for steering said wheels in a desired direction. A mode selector valve is interposed in the fluid flow circuit between the steering wheel and the cylinders for selectively selecting either four-wheel steer, crab steer, or front-wheel steer mode of steering for said vehicle. A control momentarily overrides the mode selector valve to isolate the rear hydraulic cylinders from the front hydraulic cylinders for permitting independent movement of the rear wheels of the vehicle.
REFERENCES:
patent: 3903983 (1975-09-01), Yeske
patent: 4175638 (1979-11-01), Christensen
Pettibone publication describing operation of Model 441-B Speed Swing
Braden Donald G.
Riehl David C.
Deutsch B. E.
Dresser Industries Inc.
Pekar John A.
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