Motors: expansible chamber type – Cyclically operable
Patent
1976-09-20
1978-07-11
Geoghegan, Edgar W.
Motors: expansible chamber type
Cyclically operable
91303, 60369, 60372, 60383, 74590, F01L 1500
Patent
active
040994473
ABSTRACT:
A hydraulically operated oil well pump jack utilizing a double acting hydraulically operated piston and cylinder assembly for pivoting the walking beam of an oil well pump jack, a linkage mechanism for operating a reversing valve to cause extension and retraction of the piston and cylinder assembly for oscillating the beam about a saddle bearing at the upper end of a stanchion or samson post together with a crossover cushioning device for controlling acceleration and deceleration of the oscillating walking beam to reduce abrupt tension forces exerted on the polish rod and sucker rods and also reduce impact forces on the oil well pump jack during oscillation of the walking beam. The oil well pump jack is adapted for use in removing or installing the polish rod, sucker rods, pump and production tubing by utilizing a gin pole assembly which includes a pair of lift cables alternately used for lifting or lowering the components with ratchet winches being provided for alternately taking up slack cable or paying out cable when slack with the walking beam including a pulley engaging each of the cables to effectively lengthen and shorten the length of the cables during oscillation of the walking beam.
REFERENCES:
patent: 2131910 (1938-10-01), Vernon et al.
patent: 2232449 (1941-02-01), Habenicht
patent: 2550723 (1951-05-01), Ross
patent: 2704998 (1955-03-01), Day et al.
patent: 3175513 (1965-03-01), Dulaney
patent: 3369490 (1968-02-01), Hawk
Ada Pumps, Inc.
Geoghegan Edgar W.
Jacobson Harvey B.
O#Brien Clarence A.
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