Patent ID: 9428965
Filing Date: 2016-08-30
CPC Classification: E21B

Claim Text:
1. A drill bit, comprising: a shank, wherein the shank comprises a cutting end and an opposite pin end configured to be attached to a drill string; a plurality of ear portions disposed proximate to the cutting end of the shank and configured to form a socket, at least one of the plurality of ear portions having a locking pin hole configured to receive a locking pin; a ball-shaped cutting tool comprising a plurality of cones partially recessed within the socket; milling courses separated by ridges extending outwardly from the shank, wherein the ridges have a planar surface substantially aligned with a plane separating the plurality of cones; wherein the ball-shaped cutting tool is rotatably attached to the plurality of ear portions via an axle; wherein the locking pin is perpendicular to the axle; and wherein the plurality of cones rotates in opposite directions around the axle while the drill bit is drilling.