Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1997-12-18
2000-02-22
Bagnell, David
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
384 94, 277336, 277382, 277390, 277396, F16J 1534, F16C 3372
Patent
active
060269170
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 where it joins the bit body. At least one cutter is mounted for rotation on the bearing shaft and has radial and axial surfaces that cooperate with the base of the bearing shaft to define a bearing seal gland. A bearing is defined between the cutter and bearing shaft. A seal element is disposed in the seal gland. A secondary seal is disposed in the seal gland opposite the cutter axial surface and cooperates with the seal element to at least partially seal the gland against entry of debris from the exterior of the bit.
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Koltermann Terry J.
Lin Chih
Schmidt Scott R.
Sullivan Eric C.
Zahradnik Anton F.
Bagnell David
Baker Hughes Incorporated
Bradley James E.
Kang Chi H.
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