Power plants – Pressure fluid source and motor – Cyclically operable reciprocating or oscillating motor or...
Patent
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
Garrett Robert E.
Hessin Robert M.
Husar John M.
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