Rotary drill bits with plural sealing systems

Details Rotary drill bits with plural sealing systems Rotary drill bits with plural sealing systems

1989-07-19

1990-09-11

Massie, Jerome W.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

384 94, F16C 3376, F21B 1022

Patent

active

049554409

ABSTRACT:
An earth boring rotary drill bit suitable for use in drilling oil wells and the like includes a rotating cone mounted on a journal that is protected by a primary seal and a secondary seal. The seals provide independent sealing action while coacting to stabilize the rotary motion of the cone. The primary seal defines a moving sealing surface in contact with the journal, and the secondary seal defines a moving sealing surface in contact with the rotating cone. The journal can have a frusto-conical or cylindrical configuration.

REFERENCES:
patent: 1884965 (1932-10-01), Baggett et al.
patent: 4249781 (1981-02-01), Olschewski et al.
patent: 4263976 (1981-04-01), Lachonius
patent: 4552233 (1985-11-01), Klima
patent: 4577705 (1986-03-01), Cross
patent: 4722404 (1988-02-01), Evans

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