Reverse circulation down-the-hole hammer drill and bit therefor

Details Reverse circulation down-the-hole hammer drill and bit therefor Reverse circulation down-the-hole hammer drill and bit therefor

1987-12-18

1989-04-11

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175215, 175393, 175418, E21B 414, E21B 1038, E21B 1060

Patent

active

048197467

ABSTRACT:
A reverse circulation down-the-hole hammer drill apparatus for drilling rock and overburden comprises a fluid-driven piston which reciprocates in an annular chamber to repeatedly strike a bit suspended at one end of the chamber, for example in a splined mounting. Fluid is exhausted through the bit directly to the face of the bit and cuttings and debris are returned via a central throughbore in the bit and in the drill apparatus to the surface. The bit drops forward on encountering a void during drilling operations to open by-pass passages which exhaust fluid directly into the throughbore temporarily so as to prevent any loss of return of sample to the surface.

REFERENCES:
patent: 2903239 (1959-09-01), Standridge
patent: 3416618 (1968-12-01), Kunnemann
patent: 3419092 (1968-12-01), Elenburg
patent: 3524511 (1970-08-01), Klemm
patent: 4321974 (1982-03-01), Klemm
patent: 4705119 (1987-11-01), Kostylev et al.
patent: 4709768 (1987-12-01), Kostylev et al.

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