Hydraulic reciprocating device
AssigneeIngersoll-Rand Company
InventorEwald H. Kurt
Life of this patent
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Abstract
This invention pertains to a hydraulic reciprocating device having a housing and a piston in the housing. The piston has a first and second surface, and a means for intermittently communicating the first surface of the piston with a hydraulic pressure source. Also provided is a means for continuously communicating the second surface of the piston with pressurized fluid such as pneumatic fluid. The piston moves in a first direction when the hydraulic pressure source communicates with the first surface of the piston and the piston moves in a second direction when the hydraulic pressure source does not communicate with the first surface of the piston.
Claims3
A hydraulic reciprocating device for a downhole drill comprising:
- (a) a housing;
- (b) a piston means in said housing, said piston means having a first operating surface and a second opposed operating surface;
- (c) a means for alternately communicating said first surface of the piston means with a hydraulic fluid;
- supply and hydraulic fluid return
- (d) a means for continuously communicating said second surface of the piston means with pneumatic fluid wherein the piston means moves in a first impact direction when the hydraulic fluid supply communicates with the first surface of the piston and wherein the piston means moves in a second return direction when the hydraulic fluid return communicates with the first surface of the piston means;
- said piston having said first surface and a separate second piston having said second surface, and
- (e) a means for venting said pneumatic fluid whereby said pneumatic fluid also purges the drill hole for chip removal.
Dependencies are inferred from the claim text.