Drill bit for producing undercuts

Details Drill bit for producing undercuts Drill bit for producing undercuts

1989-06-09

1991-02-05

Kisliuk, Bruce M.

Boring or penetrating the earth

Bit or bit element

Nonsymmetrical bit

175399, 175406, 175408, E21B 1000

Patent

active

049896814

ABSTRACT:
A drill bit for producing an undercut. The drill bit includes a shaft and a cutting edge that is disposed asymmetrically radially beyond the shaft in a front end portion of the drill bit. A planar guide surface is provided on a conical end face of the drill bit. This guide surface is disposed radially opposite the cutting edge. The guide surface terminates at a concentric tip of the drill bit.

REFERENCES:
patent: 2773672 (1956-12-01), Holmes et al.
patent: 3163243 (1964-12-01), Cleary
patent: 3199616 (1965-08-01), Hjalsten
patent: 4111270 (1978-09-01), Fischer et al.
patent: 4372401 (1983-02-01), Fischer
patent: 4492278 (1985-01-01), Leighton
patent: 4620600 (1986-11-01), Persson
patent: 4635738 (1987-01-01), Schillinger et al.
patent: 4768599 (1988-09-01), Eischeid

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