Rock drilling tool including a drill bit having a recess in a fr

Details Rock drilling tool including a drill bit having a recess in a fr Rock drilling tool including a drill bit having a recess in a fr

1997-03-06

1999-04-06

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175414, E21B 1036

Patent

active

058905510

ABSTRACT:
A drill bit for percussive drilling includes a front surface in which cutting inserts are mounted. A recess is formed in the front surface, and a fluid channel extends through the drill bit for supplying flushing fluid to the recess. The recess is completely bordered by an endless land. Some of the cutting inserts are mounted in the land. Others of the cutting inserts are mounted in the recess in order to be cooled and flushed by a cushion of flushing fluid created in the recess.

REFERENCES:
patent: 3322218 (1967-05-01), Hildebrandt
patent: 3388756 (1968-06-01), Varel et al.
patent: 3583504 (1971-06-01), Aalund
patent: 4323130 (1982-04-01), Dennis
patent: 4527642 (1985-07-01), Knowlton et al.
patent: 4598779 (1986-07-01), Liljekvist et al.
patent: 4730682 (1988-03-01), Ditzig
patent: 4776411 (1988-10-01), Jones
patent: 4869330 (1989-09-01), Tibbitts
patent: 5435402 (1995-07-01), Ziegenfuss
"RAMBLAST Percussion Bits"; a brochure from Hughes Tool Division. Jul. 1991 .

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