Title: Pumping apparatus

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.

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Inventors: Goldfein, Harold A. (Lincolnwood, IL, US)

Application Number: 328544
Filing Date: 1973-02-01
Publication_date: 1976-08-31
Assignee: Inca Inks, Inc. (Northbrook, IL)
Primary Class(es): 74/41 92/165R
Other Classes:
US Patent Ref:

2199821	May, 1940	Hadgood	92/166.
2286153	Jun, 1942	Nicolescu	74/41.
2456531	Dec, 1948	Patterson	74/41.
2871072	Jan, 1959	Parks et al.	92/118.
3139762	Jul, 1964	Alfieri	92/165.
3150602	Sep, 1964	Tyre, Jr.	92/165.
3168014	Feb, 1965	Aslan	92/118.

Other Refs:
Primary Examiner: Wyche, Benjamin W.
Assistant Examiner: Ratliff, Jr., Wesley S.
Attorney: Lockwood, Dewey, Zickert & Alex