Bowed crests for milled tooth bits

Details Bowed crests for milled tooth bits Bowed crests for milled tooth bits

2005-09-27

2005-09-27

Watts, Douglas D (Department: 3724)

Metal tools and implements, making

Blank or process

Drill

C175S425000

Reexamination Certificate

active

06948403

ABSTRACT:
A method of forming milled teeth on a roller cone of a milled tooth roller cone rock bit includes shaping a crest of a chisel shaped milled tooth on the roller cone. The crest is shaped such that the crest has a convex profile from one corner to an opposite corner of the crest. Such a crest is adapted to produce at least one of a convex axial stress distribution, a substantially even axial stress distribution, and a substantially smooth axial stress distribution. Further, the forming includes radiusing each of the corners at the ends of the crest of the chisel shaped milled tooth.

REFERENCES:
patent: 3003370 (1961-10-01), Coulter, Jr.
patent: 3223188 (1965-12-01), Coulter, Jr. et al.
patent: 2305831 (2000-04-01), None

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