Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1996-08-06
1998-08-11
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175227, 277 83, E21B 1024
Patent
active
057914214
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 rigid seal ring having a seal face in contact with a second seal face. A selected one of the seal faces is at least partially formed of a hard ceramic type material with the other seal face being formed of a relatively softer material to provide improved wear resistance for the seal assembly.
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"Drill Bit Catalog", Hughes Christensen, 1994, 6 pages.
Baker Hughes Incorporated
Gunter Jr. Charles D.
Tsay Frank
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