Single cone rock bit having inserts adapted to maintain hole...

Details Single cone rock bit having inserts adapted to maintain hole... Single cone rock bit having inserts adapted to maintain hole...

E - Fixed Constructions

21

B

E21B 10/08 (2006.01)

Patent

CA 2425802

A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string. A bearing journal depends from the bit body. A single roller cone is rotatably attached to the bearing journal. The roller cone has a plurality of inserts disposed at selected positions about the cone. The journal defines a rotation angle with respect to an axis of rotation of the bit such that the roller cone includes a wall contact zone and a bottom contact zone. At least one of the inserts disposed in the wall contact zone has an extension portion terminating in a substantially planar upper surface.

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