Earth boring bit with pin mounted compensator

Details Earth boring bit with pin mounted compensator Earth boring bit with pin mounted compensator

1988-08-08

1989-12-19

Neuder, William P.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

175337, 384 93, E21B 1022

Patent

active

048876755

ABSTRACT:
An earth boring (rock) bit having a flexible diaphragm located inside the bearing shaft in a cavity between a threaded lug and a mating bearing sleeve. The diaphragm has an enlarged periphery, shaped somewhat like an o-ring, that is confined and sealed between opposed annular surfaces on the lug and the sleeve. The circular periphery of the diaphragm and cavity provide good compensation volume, from which excessive lubricant pressure is relieved by an enlarged portion which is punctured and contoured to discharge lubricant under excessive pressure while excluding drilling fluid. Simplicity and reliability are achieved by the elimination of multiple and complex manufacture and assembly operations.

REFERENCES:
patent: 1896231 (1933-02-01), Fletcher
patent: 3047344 (1962-07-01), Gros
patent: 3244459 (1966-04-01), Ortloff
patent: 3847234 (1974-11-01), Schumacher, Jr. et al.
patent: 3998500 (1976-12-01), Dixon
patent: 4055225 (1977-10-01), Millsapps
patent: 4407375 (1983-10-01), Nakamura
patent: 4412590 (1983-11-01), Daly
patent: 4597455 (1986-07-01), Walters
patent: 4600064 (1986-07-01), Scales

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