Control of continuous reciprocation of a fluid power cylinder

Details Control of continuous reciprocation of a fluid power cylinder Control of continuous reciprocation of a fluid power cylinder

F - Mech Eng,Light,Heat,Weapons

15

B

138/75

F15B 21/02 (2006.01) F01L 25/06 (2006.01) F03C 1/14 (2006.01)

Patent

CA 1179920

Abstract The pump or pumps for supplying fluid to the two ends of a double-acting cylinder include a direction control, such as a direction control valve, shiftable between extend and retract conditions. A drive mechanism for the direction control includes a rotary hydraulic motor and a driven rotary drive mechanism for shifting the direction control. Hydraulic fluid is supplied to the drive motor through parallel connec- ted start and stop valves. The start valve is opened in response to the movements of the hydraulic cylinder toward a stroke limit. The stop valve is operated in response to the shifting of the direction control, so that the motor is operated inter- mittently to reverse the direction control when the cylinder reaches the limit of an extend or retract stroke. The stop valve is controlled by the drive mechanism in timed relation with the shifting of the direction control. The start valve may be closed by that drive mechanism in timed relation with the opening of the stop valve.

413045

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