Device for shifting between fine and coarse steering of vehicles

Details Device for shifting between fine and coarse steering of vehicles Device for shifting between fine and coarse steering of vehicles

1976-04-30

1977-12-06

Geoghegan, Edgar W.

Machine element or mechanism

Control lever and linkage systems

Hand operated

180 77S, B62D 120

Patent

active

040610527

ABSTRACT:
A device for shifting between fine and coarse steering operations for articulated vehicles, comprising front and rear vehicle parts, is disclosed. Hydraulic steering cylinders are interposed between the vehicle parts for angularly displacing the parts relative to each other in order to accomplish the steering of the vehicle, and first and second valves are adapted to control the fluid flow to the steering cylinders in order to provide for the fine and coarse steering operations. In accordance with the invention, a shifting mechanism, which is shiftable between two positions, is adapted, in a first position, to connect an actuator, provided for controlling the steering of the vehicle, to the first valve, and is adapted, in a second position, to connect the actuator to the second valve. When the shifting mechanism is in the first position, a mutual angular displacement of the vehicle parts is obtained which is proportional to the movement of the actuator, while when the shifting mechanism is in its second position, a continuous angular displacement of the vehicle parts is obtained as long as the actuator is moved from a predetermined initial position.

REFERENCES:
patent: 1717681 (1929-06-01), Goodwin
patent: 3152657 (1964-10-01), Ede et al.
patent: 3249174 (1966-05-01), Orwig

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