Hydraulic system

Details Hydraulic system Hydraulic system

1975-04-21

1977-07-26

Schwadron, Martin P.

Motors: expansible chamber type

With signal, indicator or inspection means

91 35, 91358A, 91361, 214762, 214764, 318663, 318672, F01B 2526, F01B 3112

Patent

active

040375196

ABSTRACT:
An electro hydraulic system for controlling a hydraulic function includes a pump and a reservoir connected to the function through a manually operable, electro-hydraulic control valve. The valve is positionable to either side of a neutral ports blocked position and may be held to one side by the engaging of a spring loaded detent. The detent is disengaged by an electrical signal produced by a comparator when a preset, operator-controlled, limiting signal is equalled by a feed back sensor signal proportional to the output of the function. The system will allow initial activation of the valve to provide continuous operation of the function until the limiting input is reached at which time the function will be stopped. The system further provides manual override of the electrical control system to permit operation of the valve when the feedback signal is greater than the limiting input signal.

REFERENCES:
patent: 3026638 (1962-03-01), Hayner
patent: 3420393 (1969-01-01), Omon
patent: 3487958 (1970-01-01), Shook
patent: 3547293 (1970-12-01), Borer
patent: 3732892 (1973-05-01), Bubula
patent: 3752189 (1973-08-01), Marr
patent: 3782250 (1974-01-01), Kiszewski
patent: 3915325 (1975-10-01), Lark

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