Lubricant pressure compensator for an earth boring drill bit

Details Lubricant pressure compensator for an earth boring drill bit Lubricant pressure compensator for an earth boring drill bit

E - Fixed Constructions

21

B

255/73

E21B 10/00 (2006.01) E21B 10/24 (2006.01) F16N 9/02 (2006.01)

Patent

CA 1056368

Abstract of the Disclosure An improved lubricant pressure compensator sys- tem for an earth boring drill bit for equalizing the lubri- cant pressure with the ambient or borehole pressure. The pressure compensator is located in a lubricant reservoir that has a passage leading out of the bit adjacent the dis- charge nozzle. A flexible diaphram is located in the re- servoir with its lip seated against the base of the reser- voir. The lip protrudes outwardly and a protector member bears downwardly against the lip. A cap bears against the protector member compressing the lip. A retainer ring holds the cap with the lip under compression. A protective center- ing disc is attached to the center of the diaphram. -2-

271903

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