Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1973-02-01
1976-08-31
Wyche, Benjamin W.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
92165R, F16H 2132
Patent
active
039772594
ABSTRACT:
A double-acting hydraulic cylinder unit imparts rocking movement to the walking beam of well pumping apparatus and has either (1) a stationary piston and a generally vertically reciprocating cylinder or (2) a stationary cylinder and a generally vertically reciprocating piston. Upper and lower piston rods of equal size extend from opposite sides of the piston and project through the upper and lower ends, respectively, of the cylinder. In one arrangement the lower end of the lower piston rod is pivotally anchored so as to pivotally absorb both compression and tension forces transmitted through the lower piston rod while the upper piston rod is not anchored and the primary function of the upper piston rod is to provide for equal displacement of fluid on opposite sides of the piston during vertical reciprocation of the piston. In the second arrangement the upper end of the upper piston rod is pivotally connected to the walking beam while the lower piston rod is not anchored and its primary function is to provide for equal displacement of fluid on opposite sides of the piston during vertical reciprocation thereof.
REFERENCES:
patent: 2199821 (1940-05-01), Hadgood
patent: 2286153 (1942-06-01), Nicolescu
patent: 2456531 (1948-12-01), Patterson
patent: 2871072 (1959-01-01), Parks et al.
patent: 3139762 (1964-07-01), Alfieri
patent: 3150602 (1964-09-01), Tyree, Jr.
patent: 3168014 (1965-02-01), Aslan
Inca Inks, Inc.
Ratliff, Jr. Wesley S.
Wyche Benjamin W.
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