Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Separate valve means actuatable by a common nonmanual...
Patent
1980-12-01
1987-01-27
Hershkovitz, Abraham
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
Separate valve means actuatable by a common nonmanual...
91527, 91529, 91530, F15B 1100
Patent
active
046387200
ABSTRACT:
An electro-hydraulic control system includes a plurality of two-position control valves, each controlling fluid flow into and out of a corresponding one of a plurality of hydraulic functions. First and second pressure responsive servo actuators associated with each control valve operate to move each control valve to first and second positions, respectively. A two-position, solenoid-operated, pilot valve controls fluid flow into and out of a pilot circuit. The pilot circuit communicates fluid to and from the second servo actuator of each control valve and to and from a plurality of two-position, soleniod-operated, pilot valves. Each pilot valve controls fluid flow into and out of the first servo actuator of a corresponding one of the control valves. A detent mechanism holds each control valve in either its first or its second position in the absence of fluid pressure in the servo actuators. A particular hydraulic function may be actuated by momentary energization of particular solenoids of the rest and/or the pilot valves.
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Formwalt, Jr. Charles W.
McKee Kevin D.
Deere & Company
Hershkovitz Abraham
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