Pump jack drive apparatus

Details Pump jack drive apparatus Pump jack drive apparatus

F - Mech Eng,Light,Heat,Weapons

04

B

103/142

F04B 47/02 (2006.01) F04B 47/04 (2006.01)

Patent

CA 1164270

ABSTRACT OF THE DISCLOSURE A pump jack drive apparatus includes a pair of hydraulic cylinders connected to a walking beam of the pump jack for recipro- cating 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.

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