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

1976-05-17

1977-10-25

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

175372, E21B 910

Patent

active

040552250

ABSTRACT:
An improved lubricant pressure compensator system for an earth boring drill bit for equalizing the lubricant 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 discharge nozzle. A flexible diaphram is located in the reservoir with its lip seated against the base of the reservoir. 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 centering disc is attached to the center of the diaphram.

REFERENCES:
patent: 3719241 (1973-03-01), Bell
patent: 3721306 (1973-03-01), Sartor

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