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Threaded cone retention system for roller cone bits

Image Number 3 for United States Patent #7975779.

An apparatus for retaining a roller cone on a bearing pin of a drill bit body that includes a drill bit body; a bearing pin coupled to the drill bit body; a retention member coupled to the bearing pin; a roller cone coupled to the retention member; and a torque transfer member coupled to the retention member and the roller cone adapted to selectively transfer torque between the retention member and the roller cone.

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