Rotary drill bit and roller cutter for rock drilling

Details Rotary drill bit and roller cutter for rock drilling Rotary drill bit and roller cutter for rock drilling

1998-11-17

2000-11-14

Bagnell, David

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

430431, E21B 1016

Patent

active

061456055

ABSTRACT:
A rotary rock drill bit includes a bit body and three conical roller cutters rotatably mounted thereon. Each roller cutter has at least first, second, and third circumferential rows of buttons spaced apart in the direction of rotation of the roller cutter. The three rows of buttons are arranged successively from a rear end toward a front end of the roller cutter. The buttons of each of the first and second rows have lengths of attack which are longer in a direction of rotation of the roller cutter than in a direction perpendicular thereto. Those longer lengths of attack are also longer than a length of attack of the buttons of the third row in the rotational direction.

REFERENCES:
patent: 4343371 (1982-08-01), Baker, III et al.
patent: 5172777 (1992-12-01), Siracki et al.
patent: 5323865 (1994-06-01), Isbell et al.
patent: 5592995 (1997-01-01), Scott et al.
patent: 5881828 (1999-03-01), Fischer et al.

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