Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1993-10-15
1994-11-15
Britts, Ramon S.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
175371, 384 93, F21B 1022
Patent
active
053639308
ABSTRACT:
An earth-boring bit has a bit body and at least one saddle member secured to the bit body to receive and support each of a pair of ends of a journal member. A cutter is mounted for rotation on the journal member and a bearing is defined between the cutter and journal member. A lubricant reservoir is formed in the journal member to receive a quantity of lubricant and is in fluid communication with the bearing. A seal means is provided between the cutter and journal member to retain lubricant in the bearing. A hydrostatic-pressure compensator is disposed in the lubricant reservoir in communication with hydrostatic-pressure in the borehole in which the bit operates. The hydrostatic-pressure compensator responses to hydrostatic-pressure to equalize a pressure differential across the seal means. An internal-pressure compensator is disposed in the lubricant reservoir and is responsive to the internal pressure of the lubricant to prevent the lubricant from being extruded past the seal means.
REFERENCES:
patent: 4254838 (1981-03-01), Barnetche
patent: 4386667 (1983-06-01), Millsapps, Jr.
patent: 4388984 (1983-06-01), Oelke
patent: 4407375 (1983-10-01), Nakamura
patent: 4552228 (1985-11-01), Evans et al.
patent: 4577705 (1986-03-01), Cross
patent: 5040624 (1991-08-01), Schumacher et al.
patent: 5072795 (1991-12-01), Delgado et al.
patent: 5080183 (1992-01-01), Schumacher et al.
Baker Hughes Incorporated
Britts Ramon S.
Felsman Robert A.
Perdue Mark D.
Tsay Frank S.
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