Lock with variable length piston and hydraulic system for a...

Details Lock with variable length piston and hydraulic system for a... Lock with variable length piston and hydraulic system for a...

F - Mech Eng,Light,Heat,Weapons

16

D

138/72.1

F16D 3/02 (2006.01) A01B 63/10 (2006.01) E02F 3/84 (2006.01) F15B 13/01 (2006.01)

Patent

CA 1133359

LOCK VALVE WITH VARIABLE LENGTH PISTON AND HYDRAULIC SYSTEM FOR A WORK IMPLEMENT USING THE SAME Abstract 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.

352230

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