Pump jack device

Details Pump jack device Pump jack device

1976-06-23

1977-09-13

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Cyclically operable reciprocating or oscillating motor or...

60464, 60476, 91218, F15B 904

Patent

active

040473848

ABSTRACT:
A jack pump, such as the type capable of use in pumping crude oil from an oil well, the jack pump 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 a total velocity profile during the complete pumping cycle and to determine the length and position of the stroke of the piston rod.

REFERENCES:
patent: 2560676 (1951-07-01), White
patent: 2564285 (1951-08-01), Smith
patent: 3499284 (1970-03-01), Johnson
patent: 3939656 (1976-02-01), Goldfein

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