Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1991-01-22
1991-12-17
Dang, Hoang C.
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, E21B 1022
Patent
active
050727958
ABSTRACT:
A fluid pressure compensator for a lubrication system in a rotary drill bit includes a diaphragm (44) with an enlarged thickness central portion (62) having a generally hemispherically shaped deformation (72) at its center to form a minimal thickness thereat progressively increasing to the enlarged thickness. A self sealing puncture (74) is provided at the center of the diaphragm (44) to relieve excess pressure differentials in the lubrication system internally of the drill bit and excess pressure differentials in the drilling fluid externally of the drill bit. The diaphragm (44) has an enlarged protuberance (64) about its outer periphery which is secured in sealing relation within a groove formed by sealing surfaces (66, 68, 70) on a leg (10) of the rotary bit and associated securing cap (46). A protective cup (42) supports the diaphragm (44) in an extended position and has dimples (58) for supporting the diaphragm (46) on the bottom (40) of the lubricant reservoir (49).
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Delgado Steve R.
Hall Frank
Kotch Robert J.
Camco International Inc.
Dang Hoang C.
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