Overruning load control for hydraulic jacks

Details Overruning load control for hydraulic jacks Overruning load control for hydraulic jacks

1975-03-05

1976-08-03

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91447, 91454, 91461, 137495, 13759615, 13759618, F15B 1108, F15B 13042

Patent

active

039722678

ABSTRACT:
An overrunning load control for a hydraulic jack includes a pair of variable orifice means in series, with the degree of metering of one of such orifices being determined by fluid pressure in the end of the hydraulic jack resisting the load. The degree of metering of the other variable orifice may be selectively chosen, through actuation of a relatively low pressure hydraulic pilot system.

REFERENCES:
patent: 2157707 (1939-05-01), Keel
patent: 3800670 (1974-04-01), Hufeld et al.

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