Percussive down-the-hole hammer and a drill bit therefor

Details Percussive down-the-hole hammer and a drill bit therefor Percussive down-the-hole hammer and a drill bit therefor

1999-03-03

2000-10-03

Schoeppel, Roger

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175417, 173 78, E21B 414, E21B 1038

Patent

active

061259527

ABSTRACT:
In an air actuated down-the-hole hammer for rock drilling, a piston reciprocates within a casing to impact against a rear anvil surface of a drill bit. A foot valve extends axially between the piston and the drill bit. The anvil surface is inclined downwardly in a radially outward direction to cause liquid on the anvil surface to be discharged in a direction away from the foot valve, to prevent damage to the foot valve which could occur if piston impacts were able to create high-speed liquid streams contacting the foot valve.

REFERENCES:
patent: 4878550 (1989-11-01), Chuang
patent: 5131476 (1992-07-01), Harrington
patent: 5435402 (1995-07-01), Ziegenfuss

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