Sealed bearing drill bit with dual-seal configuration

Details Sealed bearing drill bit with dual-seal configuration Sealed bearing drill bit with dual-seal configuration

1997-12-01

2000-03-07

Walsh, Donald P.

Bearings

Rotary bearing

Roller drill bit

175371, F16C 3372

Patent

active

060331178

ABSTRACT:
A sealed-bearing drill bit for use in an earthen annulus is provided having a dual seal arrangement. The drill bit includes at least one leg having a journal segment, and a roller cone mounted upon the journal segment and forming at least one bearing cavity therebetween. An annular primary seal is disposed between the leg and roller cone and between the bearing cavity and the earthen annulus. An annular secondary seal is disposed between the annular primary seal and the earthen annulus and is capable of substantially preventing the ingress of debris from the earthen annulus to the annular primary seal.

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Photographs of 15 inch MXM dual deal drill bit Manufactured by Superior Rock Bit Company, Virginia, Minn. And obtained by Applicant on May 23, 1996; (12 p.).

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