Hydraulic circuit in work vehicle

Details Hydraulic circuit in work vehicle Hydraulic circuit in work vehicle

2007-04-03

2007-04-03

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Having plural energy outputs

C091S445000, C280S763100

Reexamination Certificate

active

10540987

ABSTRACT:
A hydraulic circuit includes a control valve that controls flow of pressure oil from a hydraulic source to work hydraulic cylinders, an operating device that issues a command for drive of the control valve, valve devices each comprising a check valve, each provided in correspondence to one of the plurality of work hydraulic cylinders to allow and prohibit outflow of pressure oil from a work hydraulic cylinder, a commanding device that outputs a command allowing or a command prohibiting extension/contraction for each of the work hydraulic cylinders and a control device that controls each of the valve devices to allow outflow of pressure oil from the work hydraulic cylinder by invalidating a check valve function in response to the command for allowing extension/contraction and to prohibit outflow of pressure oil from the work hydraulic cylinder with the check valve in response to the command for prohibiting extension/contraction.

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International Search Report dated Apr. 15, 2003 (Two (2) pages).
International Search Report dated Apr. 30, 2003 (Two (2) pages).

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