Reverse circulation down-the-hole hammer drill and bit therefor
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United States of America Patent
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-
Apr 11, 1989
Grant Date -
N/A
app pub date -
Dec 18, 1987
filing date -
Jan 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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