Patent ID: 8336649
Filing Date: 2012-12-25
Classification: E21B

Abstract:
1. A drill bit for earth boring, said drill bit comprising: a bit body having a first end and a second end spaced apart from said first end; a connection means connected to said first end of the bit body for coupling said bit body to a rotation means for providing rotational torque to said bit body; a plurality of blades connected to said bit body at least at said second end, each of said plurality of blades having a face including at least one through hole having an inside diameter, said at least one through hole passing through said blade and configured to receive a cutter shaft therein; and, at least one cutter having a shaft, said shaft having a shaft diameter less that said inside diameter and an axis, and said shaft being secured in said through hole and adapted to rotate about said axis when secured in said through hole.