Reverse percussion device

Details Reverse percussion device Reverse percussion device

1995-05-08

1997-06-03

Tsay, Frank

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175135, E21B 414

Patent

active

056345240

ABSTRACT:
A reverse percussion device for use with hydraulic percussive drills is provided. The reverse percussion device includes a cycling piston, valve and anvil. The piston and valve move in opposing directions between low and high pressure passages automatically until a lodged drill bit is freed, thereby facilitating removal of the drill bit from the drilled hole and eliminating alternate loosening and tightening of drill string threads. The reverse percussion device preferably includes an automatic disabling feature which causes the reverse percussion operation to cease when the bit is free to retract normally.

REFERENCES:
patent: 5002136 (1991-03-01), Barthomeuf
patent: 5022309 (1991-06-01), Campbell
patent: 5320189 (1994-06-01), Rodert et al.
patent: 5413186 (1995-05-01), Campbell

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