Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1980-07-10
1982-08-17
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91447, F15B 13042, F15B 13043
Patent
active
043443559
ABSTRACT:
A control arrangement for lifting and lowering a hydraulically operated implement comprises a precontrolled reversing valve and a precontrolled stop block arranged in the fluid pressure stream leading from a source of fluid pressure over the reversing valve to the compartment of a cylinder and piston unit connected to the implement for lifting the latter during feeding of pressure fluid into the compartment and for lowering the implement during discharge of pressure fluid from the compartment. The stop block comprises a releasing piston cooperating with a stop valve of the stop block to alternatingly connect the compartment to a return conduit leading to a tank to discharge pressure fluid from the compartment or to the reversing valve to feed pressure fluid into the compartment. A pressure valve arranged in the releasing piston controls a connection leading from the reversing valve to a damping chamber at one end of the releasing piston which is additionally influenced by the movement of the latter. During sudden reversing of the movement of the implement from lowering to lifting fluid flows from the reversing valve over the pressure valve into the damping chamber and accelerates reversing movement of the releasing piston whereby pressure peaks in the system are avoided.
REFERENCES:
patent: 4258610 (1981-03-01), Maucher et al.
Cohen Irwin C.
Robert & Bosch GmbH
Striker Michael J.
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