Motors: expansible chamber type – Relatively movable working members with one having motive... – Single valve unit controlling plural working chambers
Patent
1980-08-01
1983-05-03
Maslousky, Paul E.
Motors: expansible chamber type
Relatively movable working members with one having motive...
Single valve unit controlling plural working chambers
91350, 91351, 91447, 60369, 74519, F01L 3100, F01L 1500
Patent
active
043816959
ABSTRACT:
A hydraulically operated pump jack utilizing dual hydraulically operated piston and cylinder assemblies for pivoting the beam of the pump jack and including a unique control arrangement associated with a reversing valve for controlling operation of the piston and cylinder assemblies. The control arrangement includes a hydraulically operated holding valve incorporated into each of the conduits between the reversing valve and the hydraulically operated piston and cylinder assemblies combined with a control piston and cylinder assembly for controlling the operation of the holding valves. A manually operated valve assembly is also incorporated into each conduit to enable conversion of either or both of the piston and cylinder assemblies from double acting to single acting. The control arrangement also includes a unique mechanism for operating the reversing valve automatically with this mechansim including a structure enabling manual disengagement of the automatic operating mechanism for the reversing valve with the reversing valve being capable of manual operation after such disengagement.
REFERENCES:
patent: 2432735 (1947-12-01), Downing
patent: 3128675 (1964-04-01), Dulaney
patent: 3971213 (1976-07-01), Kelley
patent: 4007845 (1977-02-01), Worback
Jacobson Harvey B.
Kopcynski Wink H.
Maslousky Paul E.
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