Two-piece pressure relief valve

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means

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Details

175371, 184 54, E21B 1022

Patent

active

045937753

ABSTRACT:
A pressure compensating lubricant reservoir system is disclosed for a rotary cone rock bit. The system comprises a two-piece canister and flexible boot, one side of the boot being vented to the dome area of the bit. An O-ring is utilized adjacent the reservoir cover cap to seal the lubricant within the reservoir cavity. In order to prevent damage to the O-ring, the cover cap part of the canister forms a circumferential groove therearound to accept the O-ring. An intermediate disc is trapped between the cover cap and the resilient boot and serves to close out the O-ring groove in the cover cap.
With a prior art one-piece canister, the O-ring is put into position in a groove formed by the canister, followed by insertion of the canister into a lubricant cavity formed by the bit body. Damage to the O-ring often occurs when the outer peripheral edge of the O-ring passes by a cover cap snap ring retention slot at the reservoir cavity entrance.
The O-ring can now be placed in the reservoir cavity without damage to the ring.

REFERENCES:
patent: 3917028 (1975-11-01), Garner
patent: 4055225 (1977-10-01), Millsapps
patent: 4161223 (1979-07-01), Oelke
patent: 4183416 (1980-01-01), Walters
patent: 4248484 (1981-02-01), Newcomb
patent: 4274498 (1981-06-01), Penny
patent: 4276946 (1981-07-01), Millsapps, Jr.
patent: 4388984 (1983-06-01), Oelke
patent: 4407375 (1983-10-01), Nakamura
patent: 4448268 (1984-05-01), Fuller
patent: 4501338 (1985-02-01), Underwood

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