Earth-boring drill bit with enlarged junk slots

Details Earth-boring drill bit with enlarged junk slots Earth-boring drill bit with enlarged junk slots

1991-12-10

1994-02-08

Neuder, William P.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175393, E21B 1060

Patent

active

052842150

ABSTRACT:
A drill bit includes a generally cylindrical central blank and a matrix portion mounted on the lower end of the blank which includes the crown and gage of the drill bit. Exceptionally deep junk slots are defined in the matrix portion. The lower end of the blank includes a radially inwardly tapering portion having matrix material formed thereover which defines an upper end of the junk slot. The matrix material is formed from powdered matrix material and a ductile filler which provides a matrix with a relatively high ductility. Also disclosed is a steel bit constructed in accordance with the present invention.

REFERENCES:
patent: 3112803 (1963-12-01), Rowley
patent: 3757878 (1973-09-01), Wilder et al.
patent: 3757879 (1973-09-01), Wilder et al.
patent: 4116289 (1978-09-01), Feenstra
patent: 4515227 (1985-05-01), Cerkovnik
patent: 4550790 (1985-11-01), Link
patent: 4554986 (1985-11-01), Jones
patent: 4696354 (1987-09-01), King et al.
patent: 4869330 (1989-09-01), Tibbitts
patent: 4877096 (1989-10-01), Tibbitts
patent: 4883132 (1989-11-01), Tibbitts
patent: 4884477 (1989-12-01), Smith et al.
patent: 4913244 (1990-04-01), Trujillo

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