Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1995-08-04
1997-08-12
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
E21B 1022
Patent
active
056556110
ABSTRACT:
An earth-boring bit has a bit body and at least one bearing shaft depending inwardly and downwardly from the bit body. The bearing shaft has a base and a generally cylindrical bearing surface and at least one cutter is mounted for rotation on the bearing shaft. A bearing seal recess is formed generally at the base of the bearing shaft and defines a cylindrical seal face radially recessed from the journal bearing surface. A cutter seal recess is formed in the cutter generally opposite the bearing seal recess and defines a bearing cylindrical seal face. The cutter and bearing seal recesses define a seal gland including a pair of opposed radial seal surfaces. A resilient seal ring is disposed in the seal gland and compressed between the cylindrical seal faces.
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Dolezal George E.
Harris Thomas M.
Baker Hughes Inc.
Felsman Robert A.
Neuder William P.
Perdue Mark D.
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