Seal insert ring for roller cone bits

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element

Reexamination Certificate

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Details

C277S336000

Reexamination Certificate

active

07392862

ABSTRACT:
An earth boring bit has a bit body with a depending bearing pin. An insert ring is mounted on the bearing pin. The insert ring has an inner diameter greater than an outer diameter of the bearing pin, defining a clearance between the insert ring and the bearing pin to allow the insert ring to float relative to an axis of the bearing pin. An inner seal is in sealing engagement with the bearing pin and the inner diameter of the insert ring. A cone is rotatably mounted on the bearing pin, the cone having a cavity containing an outer seal groove. An outer seal located in the outer seal groove is in dynamic sealing engagement with an outer diameter of the insert ring. An anti-rotation member engages a portion of the insert ring to prevent rotation of the insert ring.

REFERENCES:
patent: 4666001 (1987-05-01), Burr
patent: 4762189 (1988-08-01), Tatum
patent: 4825964 (1989-05-01), Rives
patent: 4934467 (1990-06-01), Langford, Jr.
patent: 5005989 (1991-04-01), Karlsson
patent: 5295549 (1994-03-01), Dolezal et al.
patent: 5570750 (1996-11-01), Williams
patent: 5875861 (1999-03-01), Daly et al.
patent: 6305483 (2001-10-01), Portwood
patent: 6427790 (2002-08-01), Burr
patent: 6513607 (2003-02-01), Peterson et al.

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