RONALD MILLAR CAMPBELL
Pilots at Clark St, Upland, CA
License number
California A0281200
Issued Date
Jun 2016
Expiration Date
Jun 2018
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
1165 W Clark St, Upland, CA 91784
Professional information
Earth-Boring Bit With Improved Bearing Seal Assembly
US Patent:
5524718, Jun 11, 1996
Filed:
Jan 31, 1995
Appl. No.:
8/381692
Inventors:
Philip B. Kirk - Houston TX
George E. Dolezal - Friendswood TX
Ronald R. Campbell - Upland CA
George E. Dolezal - Friendswood TX
Ronald R. Campbell - Upland CA
Assignee:
Baker Hughes Incorporated - Houston TX
International Classification:
E21B 1022
US Classification:
175371
Abstract:
An earth-boring bit has a bit body, at least one cantilevered bearing shaft, including a base and a cylindrical journal bearing surface extending inwardly and downwardly from the bit body, and at least one cutter mounted for rotation on the cylindrical journal bearing surface of the bearing shaft. A seal assembly is disposed between the cylindrical journal bearing surface and the cutter proximally to the base of the cantilevered bearing shaft. The seal assembly includes at least one resilient sealing ring which is formed of a carboxylated hydrogenated acrylonitrile butadiene rubber.