Control circuit for positioning and tilting an earthmoving blade

Details Control circuit for positioning and tilting an earthmoving blade Control circuit for positioning and tilting an earthmoving blade

1985-09-20

1989-02-07

Garrett, Robert E.

Earth working

Mounting for pushed tool at end of motor vehicle

Transversely mounted blade

91529, 91536, 172826, E02F 385, F15B 1306

Patent

active

048025372

ABSTRACT:
Fluid control circuits commonly control actuation of a pair of cylinders for positioning an earthmoving blade. The known circuits for providing the three operating modes of the cylinders utilize a separate control valve for each cylinder thereby making precise positioning of the blade difficult since such positioning requires coordinated control of both valves. The subject fluid control circuit includes a selector valve for determining the direction of fluid flow to and from the head end and rod ends of the tilt cylinders and a single control valve for modulating and controlling the fluid flow from the pump to the cylinders. With this circuit, the selector valve can be prepositioned in the desired position prior to actuating the control valve so that dual cylinder tip, dual cylinder tilt, and single cylinder tilt of the blade is readily controlled by manipulation of only the single control valve.

REFERENCES:
patent: 3150568 (1964-09-01), Junck
patent: 3181431 (1965-05-01), Hein
patent: 3304633 (1967-02-01), Hein
patent: 3512453 (1970-05-01), Balzer
patent: 3966066 (1976-06-01), Schexhayder
patent: 3987920 (1976-10-01), Parquet
patent: 4294287 (1981-10-01), Boswell

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