Rotary rock bit with hardfacing to reduce cone erosion

Details Rotary rock bit with hardfacing to reduce cone erosion Rotary rock bit with hardfacing to reduce cone erosion

2006-06-08

2008-03-18

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S341000, C175S375000

Reexamination Certificate

active

07343990

ABSTRACT:
An earth-boring bit has a body with three bit legs. A cone is rotatably mounted to each of the bit legs. Each of the cones has an outer row and an inner row of teeth machined on it. Each of the teeth has a rectangular root with inner, outer and lateral boundaries. A layer of hardfacing is applied to each tooth and on an exterior portion of each of the cones surrounding the inner, outer and lateral boundaries of each of the teeth. Conical surfaces between the inner and outer rows contain at least portions of the hardfacing.

REFERENCES:
patent: 4597456 (1986-07-01), Ecer
patent: 5348770 (1994-09-01), Sievers et al.
patent: 6138779 (2000-10-01), Boyce
patent: 6253862 (2001-07-01), Overstreet et al.
patent: 6766870 (2004-07-01), Overstreet
patent: 2001/0015290 (2001-08-01), Sue et al.

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