Hydraulically-operated pump jack with chain drive

Details Hydraulically-operated pump jack with chain drive Hydraulically-operated pump jack with chain drive

1983-05-09

1985-02-05

Smith, Leonard E.

Pumps

Motor driven

Fluid motor

92137, 60369, 417399, F04B 4704

Patent

active

044976160

ABSTRACT:
My invention relates to pumping apparatus, particularly to a hydraulically-operated pump jack for oil, brine water and the like. The apparatus is fabricated from steel plate to make a strong, but light-weight tower which may be easily transported from one site to another by a small boom truck or gin pole truck. In contrast to pump jacks of the walking beam type which are massive in size, my improved pump jack is compact and is seated on and secured directly to the head of an oil well casing. A vertically-arranged hydraulic cylinder has its piston rod connected to a cross head on which a pair of sprockets are journalled. Chains pass around respective sprockets, one reach of each chain extending upwardly and is anchored to a stationary part of the tower. The other reach of each chain extends upwardly and over and around an upper sprocket journalled on a shaft carried by the upper end of the tower, each chain then extending downwardly to a yoke to which the polish rod is connected. This arrangement will result in a 2 to 1 ratio between the movement of the polish rod and the stroke of the hydraulic cylinder.

REFERENCES:
patent: 2874641 (1959-02-01), McCandlish et al.
patent: 2949861 (1960-08-01), Heath
patent: 3115086 (1963-12-01), Stimmel
patent: 4299545 (1981-11-01), Bever
patent: 4346620 (1982-08-01), Stanton
patent: 4432706 (1984-02-01), Gilbertson

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