Power plants – Pressure fluid source and motor – Ram driven by fluid pumped from reservoir
Patent
1978-02-22
1979-12-25
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Ram driven by fluid pumped from reservoir
91447, 91454, 91461, F15B 1518
Patent
active
041798899
ABSTRACT:
A control circuit for a hydraulic cylinder and shaft assembly to regulate movement of the shaft relative to one end of the cylinder. The circuit has a fluid pressure supply and associated reservoir and a metering valve with interconnected normally closed passage means connected at one end to the one cylinder end and at an opposite end to the reservoir. The fluid pressure supply, in a first condition, supplies fluid under pressure to the one cylinder end, and, in a second condition supplies piloting fluid under pressure for actuating the metering valve to regulate the fluid flow from the one cylinder end to the reservoir through the normally closed passage means. In a first preferred embodiment, the control circuit fluid pressure supply comprises a three position control valve and a variable speed motor for driving a unidirectional, fixed displacement fluid pump, whereas in a second preferred embodiment the fluid pressure supply is comprised of a variable speed bi-directional motor which drives a fixed displacement bi-directional pump.
REFERENCES:
patent: 2900960 (1959-08-01), Gratzmuller
patent: 3255587 (1966-06-01), London
patent: 3800537 (1974-08-01), Denis
Geoghegan Edgar W.
Lowell Rudolph L.
Pingel G. Brian
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