Pressure compensator for rotary earth boring tool

Details Pressure compensator for rotary earth boring tool Pressure compensator for rotary earth boring tool

1981-08-17

1983-10-04

Purser, Ernest R.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

384 93, 138 31, E21B 1022

Patent

active

044073755

ABSTRACT:
A pressure compensator installed in the bit body of a rotary earth boring tool to lubricate the bearing surfaces of a rotary cutter and to effect a liquid seal. In order to reduce the number of component parts and to enhance durability, the pressure compensator includes a rubber diaphragm interposed between upper and lower capsule halves that form a spherical space.

REFERENCES:
patent: 2324701 (1943-07-01), Herman
patent: 3221306 (1973-03-01), Sartor
patent: 3476195 (1969-11-01), Galle
patent: 4055225 (1977-10-01), Millsapps
patent: 4287916 (1981-09-01), Sugimura et al.

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