Hydraulic drive circuit for machine tools

Details Hydraulic drive circuit for machine tools Hydraulic drive circuit for machine tools

1977-01-07

1978-01-31

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Cyclically operable reciprocating or oscillating motor or...

60413, 91218, 91220, F15B 102, F15B 1518

Patent

active

040708314

ABSTRACT:
A hydraulic drive circuit for machine tools, such as power shears, press brakes, and the like having hydraulic cylinder reciprocated members, controls fluid flow to and from the hydraulic cylinders to automatically move and hold the member in an idle position, to apply power in the desired direction upon demand, and to bypass fluid for unloading the pump until power is demanded. In power shears and press brakes, the vertically movable ram is automatically raised and held in an out-of-the-way position whenever the manually actuated control is released even after stoppage of the pump.

REFERENCES:
patent: 3818799 (1974-06-01), Hague
patent: 3913450 (1975-10-01), MacGregor
patent: 3963039 (1976-06-01), Coeurderoy

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