Patent ID: 7461708
Filing Date: 2008-12-09
Classification: E21B

Abstract:
1. A drill bit, comprising: a cone cutter rotatably mounted on a journal shaft, said cone cutter including a seal gland; an annular elastomeric sealing seal disposed about said journal shaft in said seal gland, said sealing seal including a first portion having a dynamic sealing surface for dynamically engaging said journal shaft and a second portion having a static sealing surface opposite said dynamic sealing surface, wherein the first portion comprises a first material and the second portion comprises a second material that is less wear resistant than the first material; and at least one elastomeric auxiliary annular seal member disposed about said journal shaft in said seal gland, said at least one auxiliary annular seal member engaging said static sealing surface of said sealing seal and statically engaging said seal gland; wherein said at least one auxiliary annular seal member radially biases the dynamic sealing surface of the sealing seal against the journal shaft.