E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 4/14 (2006.01)
Patent
CA 2186272
An in-the-hole hydraulic hammer drill of the type having an inlet passageway for fluid and connectible to a drill string providing a source of pressurized fluid, and having pistons capable of providing downwardly directed impacts onto anvils solidly connectible to a drill bit, and having valves operated automatically by movement of the pistons to provide a continuous cycle of operation. The pistons include an upper piston and a lower piston, each capable of impacting respective upper and lower anvils solid with the drill bit, and the valves means include an inlet valve situated at the junction of the lower end of the upper piston and the upper end of the lower piston and closable by the coming together of the upper and lower pistons, and an outlet valve at the lower end of the lower piston and having a valve member operated by the lower piston. The valves and pistons are arranged so that when the outlet valve is closed and the inlet valve is open fluid pressure causes both pistons to rise, and so that when the inlet valve is closed and the outlet valve is open both pistons descend together until the upper piston is halted in its movement by impacting the upper anvil. The lower piston continues to descend until impacting the lower anvil means. The impacts from the two pistons are close together in time.
Anderson J. Wayne
National Research Council Of Canada
Puchala Ryszard J.
LandOfFree
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