Rotary drill bits

Details Rotary drill bits Rotary drill bits

E - Fixed Constructions

21

B

255/78

E21B 10/00 (2006.01) E21B 10/22 (2006.01)

Patent

CA 2019460

Abstract of the Disclosure An earth boring rotary drill bit suitable for use in drilling oil wells and the like is disclosed. The rotary drill bit 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.

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