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Self relieving seal

  • US 20060096782A1
  • Filed: 12/19/2005
  • Published: 05/11/2006
  • Est. Priority Date: 04/03/2002
  • Status: Active Grant
First Claim
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1. An annular seal for use in a rotary cone drill bit having a body, a leg extending from the body, and a cutting cone rotatably mounted on the leg, the annular seal comprising:

  • a seal body formed from an elastomeric material, the seal body having;

    a first sealing surface that is positioned against an adjacent sealing surface of the leg; and

    a second sealing surface that is positioned against an adjacent sealing surface of the cone, wherein one of the first and second sealing surfaces forms a dynamic rotary seal against its respective leg or cone sealing surfaces; and

    a pair of external surfaces each extending along the seal body between the first and second sealing surfaces; and

    one or more relief ports disposed axially through the seal body and having openings through each of the seal body external surfaces.

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