Inclined chisel inserts for rock bits

Details Inclined chisel inserts for rock bits Inclined chisel inserts for rock bits

1991-09-26

1992-12-22

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175430, 175431, E21B 1016, E21B 1052

Patent

active

051727773

ABSTRACT:
A chisel gage insert is disclosed having a larger nose radius at the outer end of the insert crest than at the inner end thereby providing more mass on the portion of the insert that contacts the borehole sidewall. The rounded crest also blends with the convex surfaces of the insert extension so as not to have any non-tangential intersections.

REFERENCES:
patent: 3442342 (1969-05-01), McElya et al.
patent: 3599737 (1971-08-01), Fischer
patent: 4058177 (1977-11-01), Langford, Jr. et al.
patent: 4086973 (1978-05-01), Keller et al.
patent: 4334586 (1982-06-01), Schumacher
patent: 4406337 (1983-09-01), Dill
patent: 4832139 (1989-05-01), Minikus et al.

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