Earth-burning bit having an improved hard-faced tooth structure

Details Earth-burning bit having an improved hard-faced tooth structure Earth-burning bit having an improved hard-faced tooth structure

1994-07-25

1995-08-29

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175426, E21B 1016, E21B 1050

Patent

active

054452317

ABSTRACT:
An earth-boring bit has a bit body, at least one cutter rotatably secured to the bit body and including a plurality of teeth formed integrally with the cutter and arranged in circumferential rows thereon. A pair of ribs is formed on at least one of the flanks of at least one of the teeth. The ribs are spaced apart to define a central depression therebetween extending through the crest of the tooth. A thickness of wear-resistant material fills the depression. According to a preferred embodiment of the present invention, wear-resistant material is applied over the ribs, crest, and a portion of the ends and flanks of the tooth, wherein the thickness of the wear-resistant material over the depressions greater, preferably 1/8 inch, than that elsewhere on the tooth.

REFERENCES:
patent: 2058753 (1936-10-01), Zublin
patent: 2244617 (1941-06-01), Hannum
patent: 2660405 (1953-11-01), Scott et al.
patent: 2687875 (1954-08-01), Morlan et al.
patent: 3800891 (1974-04-01), White et al.
patent: 4262761 (1981-04-01), Crow
patent: 4276946 (1981-07-01), Millsapps, Jr.
patent: 4630692 (1986-12-01), Ecer
patent: 5152194 (1992-10-01), Kesharam et al.
patent: 5351769 (1994-10-01), Scott et al.

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