Percussion rock drill bit

Details Percussion rock drill bit Percussion rock drill bit

1996-12-20

1998-08-18

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Nonsymmetrical bit

175418, E21B 1036

Patent

active

057947287

ABSTRACT:
A rock drill bit for percussive drilling includes a head and a shank. The shank has a central boring in which a thread is provided. The thread cooperates with a corresponding thread in a drill string driven by a top hammer. The boring is connected to at least one fluid passage which emerges in or in the vicinity of a front face of the head. The fluid passage connects to a first groove which connects to a second groove, wherein at least three second grooves are provided and form between them axially forward lands. Each land carries a gauge insert. The gauge inserts are asymmetrically positioned on the drill bit, and the second groove extends radially inwards to or beyond an imaginary circle touching the radially innermost points of the inserts.

REFERENCES:
patent: 3357507 (1967-12-01), Stewart
patent: 3955635 (1976-05-01), Skidmore
patent: 4299298 (1981-11-01), McEnery et al.
patent: 5025875 (1991-06-01), Witt

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