Hydraulic drive pump apparatus

Details Hydraulic drive pump apparatus Hydraulic drive pump apparatus

1981-06-09

1984-10-02

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Cyclically operable reciprocating or oscillating motor or...

60381, 60426, 60448, 60451, F16D 3100, F16D 3102

Patent

active

044740026

ABSTRACT:
A hydraulic drive apparatus for a wellhead pump jack which utilizes oppositely driven single-acting hydraulic cylinders as actuated by a variable volume pump having flow direction and flow volume controlled by a servo linkage and control lever. The linkage transmits oscillatory sine function motion of the walking beam for movement of the control lever as intermediate biasing force prevents nulling of the system.

REFERENCES:
patent: 2200790 (1940-05-01), Eckert
patent: 3939656 (1976-02-01), Goldfein
patent: 4381695 (1983-05-01), Ogles

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