Control circuit for positioning an earthmoving blade

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

E - Fixed Constructions

02

F

341/98

E02F 3/85 (2006.01) E02F 3/84 (2006.01)

Patent

CA 1274605

Abstract of the Disclosure Control Circuit for Positioning An Earthmoving Blade Fluid control circuits are commonly used to 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 modulatably 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 positioning of the blade is readily controlled by manipulation of only the single control valve.

516996

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