Patent Number: 7,708,090

Title: Excluder ring for earth-boring bit

Abstract: An elastomeric seal ring is located between each bearing pin and each cone of an earth-boring bit. An excluder ring or band is imbedded within the inner diameter of the seal ring. A portion of the inner diameter of the seal ring as well as the excluder ring are in dynamic sealing contact with the bearing pin. The excluder ring may be harder and more wear resistant than the seal ring. The excluder ring may have lubricating properties. An outer excluder ring may be located on the outer diameter of the seal ring for engaging the cone to resist rotation.

Inventors: Zahradnik; Anton (Sugarland, TX), Ricks; Gregory L. (Spring, TX), Peterson; Gregory W. (Fort Worth, TX), Nguyen; Don Quy (Houston, TX), Lin; Chih C. (Spring, TX), Koltermann; Terry J. (The Woodlands, TX)

Assignee: Baker Hughes Incorporated

International Classification: E21B 10/25 (20060101)

Expiration Date: 5/04/12018