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| Number | Title | Issue Date |
| 7520128 | Method for automatically cycling a torque wrench A method for automatically cycling a torque wrench. The method includes providing a hydraulic torque wrench. Providing an actuating device on the hydraulic torque wrench. Providing a switching device on the hydraulic torque wrench. Adapting the switching device to b... | 04/21/2009 |
| 7200992 | Method for controlling a hydraulic piston/cylinder unit The control of the pressure supply to a piston-cylinder unit (10) is effected by monitoring the pressure in the corresponding line (16) through a pressure sensor (22). This pressure is measured in fixed time intervals and the changes in pressure... | 04/10/2007 |
| 4462759 | Oil well pump shutdown system An emergency shutdown system for an air-balanced pumping unit which includes a pump motor, a walking beam driven by the pump motor, a rod string reciprocated by the beam, and an air-balance cylinder and an air receiver which together define an air spring ... | 07/31/1984 |
| 4213298 | Self-reversing hydraulic control system and self-reversing pump incorporating such system A self-reversing hydraulic control system for use with a device to be driven in opposite directional modes, especially a self-reversing pump driven by such a device. The system depends upon a flow sensing element disposed to sense flow associated with mov... | 07/22/1980 |
| 4201115 | Oil well pump jack with dual hydraulic operating cylinders An oil well pump jack with dual hydraulically operated piston and cylinder assemblies for pivoting the walking beam of the pump jack and including a unique control arrangement for controlling operation of the piston and cylinder assemblies. The pump jack ... | 05/06/1980 |
