Hydraulic pump

Details Hydraulic pump Hydraulic pump

1981-10-20

1984-05-15

Maslousky, Paul E.

Motors: expansible chamber type

Cyclically operable

Electrically or magnetically actuated or adjusted distributor

91279, 91341R, F01L 2508, F01L 3108, F01L 2300

Patent

active

044481101

ABSTRACT:
This invention relates to an improved pump jack characterized by a hollow piston rod which telescopes down over the sucker rod to which it is clamped for reciprocating motion. The cylinder, in turn, is fastened in fixed position directly to the upper exposed end of the well casing. As fluid is introduced into the lower end of the cylinder it raises the piston into engagement with a pushrod housed in the upper cylinder head that lifts switch-actuating means associated therewith into a position operative to actuate a switch located adjacent thereto thereby causing the latter to change state and actuate a multi-function solenoid valve so as to cut off fluid flow to the cylinder. As gravity lowers the sucker rod and piston exhausting the hydraulic fluid therebeneath, an adjustable stop engages the pushrod from above so as to return it together with the switch-actuating means associated therewith to their original positions thereby resetting the switch to complete the operating cycle.

REFERENCES:
patent: 2258103 (1941-10-01), Scheider
patent: 2292331 (1942-08-01), Vertson
patent: 2691962 (1954-10-01), Johnson
patent: 2949098 (1960-08-01), Flick
patent: 3382770 (1968-05-01), Berninger et al.

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