Down-the-hole drilling

Details Down-the-hole drilling Down-the-hole drilling

1980-07-10

1981-11-10

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175400, 175 92, 175393, E21B 1060

Patent

active

042992982

ABSTRACT:
The invention concerns down-the-hole drilling, where there is a persistent problem in providing an adequately controlled flow of flushing fluid to the face of the drill bit. In known down-the-hole drills turbulence and closed circuits of the flushing fluid tend to erode the bit and reduce its lifespan. The invention seeks to lessen these drawbacks by providing for the flow of flushing fluid to be divided into a component directed along a first cavity which terminates at the face of the bit and another component directed along a second cavity which terminates above the face and is deflected up the drill hole. Weakening of the bit is avoided if there is at most one bore through the bit for flushing fluid.

REFERENCES:
patent: 604538 (1898-05-01), Leyner
patent: 1943880 (1934-01-01), Rea
patent: 2085941 (1937-07-01), Arnold
patent: 2149798 (1939-03-01), Starkey
patent: 2390646 (1945-12-01), Hays
patent: 2913225 (1959-11-01), Wolfram
patent: 2990894 (1961-07-01), Mitchell et al.
patent: 3225841 (1965-12-01), Thompson
patent: 3527239 (1970-09-01), Boom
patent: 3986565 (1976-10-01), Atkinson
patent: 4079793 (1978-03-01), Mosely et al.

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