Pump jack drive apparatus

Details Pump jack drive apparatus Pump jack drive apparatus

1980-12-19

1984-03-27

Nilson, Robert G.

Power plants

Pressure fluid source and motor

Cyclically operable reciprocating or oscillating motor or...

60383, 60476, 91183, 91275, 91306, F04B 3500

Patent

active

044386281

ABSTRACT:
A pump jack drive apparatus includes a pair of hydraulic cylinders connected to a walking beam of the pump jack for reciprocating the horsehead, and a pair of microswitches or proximity switches which are closed by the walking beam at the limits of the stroke thereof for controlling such stroke. The cylinders are driven and controlled by a pump and control unit which includes a valve for feeding hydraulic fluid to one or the other of the hydraulic cylinders, a control cylinder for controlling the valve, and two solenoid operated control valves for controlling movement of the control cylinder in response to closing of the switches by the walking beam.

REFERENCES:
patent: 2200790 (1940-05-01), Eckert
patent: 2803110 (1957-08-01), Chittenden
patent: 3128675 (1964-04-01), Dulaney
patent: 3620126 (1971-11-01), Fuhrimann
patent: 4050356 (1977-09-01), Jaggi
patent: 4114375 (1978-09-01), Saruwatari
patent: 4201115 (1980-05-01), Ogles

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