Patent ID: 6170830
Filing Date: 2001-01-09
Classification: E21B,F16J,Y10S

Abstract:
A rotary cone rock bit comprising:a bit body having at least one leg, the leg including a journal pin;a cutter cone rotatably mounted on the leg; andan annular elastomeric seal ring located between a first sealing surface on said leg and a second sealing surface on the cutter cone that forms a dynamic rotary seal between the leg and cutter cone while the cutter cone is rotating, the seal ring having:a first seal surface for forming a seal against the first sealing surface; anda second seal surface for forming a seal against the second sealing surface, the first and second seal surfaces being permanently secured to the seal ring to form a one-piece seal construction, and one of the first or second seal surfaces forming the dynamic rotary seal having a radius of curvature greater than one half of an axial seal ring thickness before being installed within the rock bit.