Drill bits

Details Drill bits Drill bits

1994-05-20

1996-04-09

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Core forming type

761082, 175430, 175431, 175432, E21B 1048

Patent

active

055052720

ABSTRACT:
A novel form of drill bit is disclosed. The bit (30) comprises a bit body having a leading face (32) and gauge surface (44, 46). Cutting inserts (32, 34, 36) are set into the bit body, each cutting insert being in the form of a segment of a composite PCD (polycrystalline diamond) or PCBN (polycrystalline cubic boron nitride) composite. Thus each insert has a PCD or PCBN compact (40) carried by a carbide backing (42). The PCD or PCBN compact of each insert is exposed at the leading face or at the gauge surface to perform an axial cutting or gauge maintenance function during drilling.

REFERENCES:
patent: 4156329 (1979-05-01), Daniels et al.
patent: 4928777 (1990-05-01), Shirley-Fisher
patent: 4981183 (1991-01-01), Tibbitts
patent: 5016718 (1991-05-01), Tandberg
patent: 5025874 (1991-06-01), Barr et al.
patent: 5180022 (1993-01-01), Brady
patent: 5195403 (1993-03-01), Sani et al.
patent: 5195404 (1993-03-01), Notter et al.
patent: 5232320 (1993-08-01), Tank et al.
patent: 5272940 (1993-12-01), Diskin
Dr. I. E. Clark, (1993) "PCD Wood Tools--A New Design Concept", IDR, 73-76.

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