Twist drill

Details Twist drill Twist drill

1994-11-18

1996-02-20

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175415, E21B 1044, E21B 1046

Patent

active

054921872

ABSTRACT:
A rock drill has an axially elongated shank (1) with a hard metal drill head (2) secured at one end. The transverse cross-section of the drill head is basically rectangular with cutters located along each of two diagonals of its cross-section. The cutters remove drillings from rock. The cutters include a main cutter (4) and two auxiliary cutters (5, 6) having the same rotational envelope curve.

REFERENCES:
patent: 2259611 (1941-10-01), Burger
patent: 3187825 (1965-06-01), Bower, Jr.
patent: 4817743 (1989-04-01), Greenfield et al.
patent: 4889200 (1989-12-01), Moser
patent: 4893875 (1990-01-01), Lonn et al.
patent: 4950108 (1990-08-01), Roos
patent: 5399051 (1995-03-01), Aken et al

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