Title: Automatic pump control system

Abstract: A control system for plural circuits having motor-driven hydraulic pumps. As disclosed, a pair of pumps is connected in a hydraulic actuating circuit individual to that pair and the circuit includes an hydraulically operated actuator to be advanced and retracted by fluid under pressure delivered from the pair of pumps of that circuit. A single prime mover drives the pair of pumps and pumps in other circuits, and each circuit has a pressure-responsive control valve which provides for unloading a pump of the first circuit in response to increases in pressure in the various other circuits to a predetermined value at which, in the absence of such unloading, the input horsepower requirement has risen toward a value which would stall the prime mover.Pumps in several of the circuits may be sequentially and selectively unloaded.

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Inventors: Ratliff, Frank W. (Corinth, MS, US)
McBurnett, James R. (Corinth, MS, US)

Application Number: 554522
Filing Date: 1975-03-03
Publication_date: 1978-05-16
Assignee: Tyrone Hydraulics, Inc. (Corinth, MS)
Primary Class(es): 60/421 60/426, 60/468, 60/486
Other Classes:
US Patent Ref:

2616264	Nov, 1952	Grant et al.	91/412.
2797551	Jul, 1957	Adams et al.	60/426.
3355994	Dec, 1967	Malott	60/430.
3535877	Oct, 1970	Becker et al.	91/412.
3841795	Oct, 1974	Ferre et al.	417/216.
3868821	Mar, 1975	Ratliff et al.	60/421.
3916767	Nov, 1975	Barton	60/486.
3924971	Dec, 1975	Jacquot	417/286.

Other Refs:
Primary Examiner: Geoghegan, Edgar W.
Assistant Examiner:
Attorney: Lindrooth; Charles H.