Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1989-02-28
1990-07-24
Kisliuk, Bruce M.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
175339, 175372, 761082, 141 7, 141114, 184 615, 384 93, E21B 1024
Patent
active
049429302
ABSTRACT:
A lubrication system for an earth boring drill bit having a pressure compensator for minimizing the pressure differential between the drill bit lubricant and the well bore fluid is improved in a manner to prevent sharp edges in the lubricant reservoir wall from damaging the flexible diaphragm and for enabling the lubricant space available in the lubricant reservoir to be maximized. In accordance with a preferred embodiment, the pressure compensator is positioned on a shoulder ring in the lubricant reservoir and the shoulder ring retains the open end of a pressure diaphragm within an interior recess of a compensator cap, the diaphragm sealing against a perimetric wall of the recess. Methods of filling the lubrication system with the pressure compensator installed or removed are provided which avoid stretching or damage to the diaphragm while still maximally filling of the lubrication system with lubricant. Furthermore, a method is achieved by which the invention lubrication system may be provided in existing drill bits by retrofit installation.
REFERENCES:
patent: 3476195 (1969-11-01), Galle
patent: 3721306 (1973-03-01), Sartor
patent: 3917028 (1975-11-01), Garner
patent: 3942596 (1976-03-01), Millsapps
patent: 4055225 (1977-10-01), Millsapps
patent: 4274498 (1981-06-01), Penny
patent: 4276946 (1981-07-01), Millsapps
patent: 4552228 (1985-11-01), Evans et al.
Cummins Engine Company, Inc.
Kisliuk Bruce M.
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