Power plants – Pressure fluid source and motor – Cyclically operable reciprocating or oscillating motor or...
Patent
1977-09-09
1978-09-19
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Cyclically operable reciprocating or oscillating motor or...
60381, 60DIG10L, F15B 902
Patent
active
041143752
ABSTRACT:
A pump jack, such as the type capable of use in pumping crude oil from an oil well, the pump jack including a double acting piston and cylinder motor with the piston rod of the motor being adapted to be connected to the polished rod projecting upwardly from a well head. A variable displacement hydraulic pump, which is driven by a motor or engine, is included in a closed hydraulic loop wherein conduits are connected to a pair of output ports of the pump. A pump control means controls the direction and volume of flow in the loop so as to establish the stroke of the piston rod. A compressible fluid counterbalance is provided for accumulation of energy during a down stroke of the piston rod so that the energy may be returned to the piston during the up stroke. An economical and versatile unit may be produced by mounting a counterbalance cylinder coaxially above the motor and providing the counterbalance with an additional closed chamber in fluid communication with a charged chamber of the counterbalance. The additional chamber may be provided in hollow structural members forming a support portion of a pump jack tower. The tower can be mounted on a portable base or deck by way of a pivot connection so that the tower can be swung down to a horizontal transportation position.
REFERENCES:
patent: 1839611 (1932-01-01), Stafford
patent: 2347301 (1944-04-01), Twyman et al.
patent: 2645899 (1953-07-01), Aller et al.
patent: 2651914 (1953-09-01), Joy
patent: 3986355 (1976-10-01), Klaeger
Canadian Foremost Ltd.
Geoghegan Edgar W.
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