Lock valve with variable length piston and hydraulic system for

Details Lock valve with variable length piston and hydraulic system for Lock valve with variable length piston and hydraulic system for

1979-08-30

1981-09-01

Hershkovitz, Abraham

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

60416, 60484, 91420, 91461, F16D 3102

Patent

active

042864321

ABSTRACT:
PCT No. PCT/US79/00664 Sec. 371 Date Aug. 30, 1979 Sec. 102(e) Date Aug. 30, 1979 PCT Filed Aug. 30, 1979 PCT Pub. No. WO81/00600 PCT Pub. Date Mar. 5, 1981
A lock valve (10) for use in a hydraulic system (90) for positioning the work implement of an earth working machine which includes first and second check valves (28, 30) and a piston section (60, 70, 62, 72) for each operable by pilot fluid. In a first mode, the piston sections (60, 70, 62, 72) permit seating of both check valves, while in a second mode, the piston sections interlock so that only one check valve can seat. The lock valve (10) operates in a hydraulic system (90) to lock a work implement, such as a blade for a motor grader, in a fixed position during a first operating mode, while providing a connection from one end of an implement actuator to vent during a second operating mode to insure that a shock absorbing means for the implement hydraulic system maintains a full shock absorbing capacity.

REFERENCES:
patent: 2506008 (1950-05-01), Arps
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patent: 3264947 (1966-08-01), Bidlack
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patent: 4081053 (1978-03-01), Sherman
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