Patent ID: 7168511
Filing Date: 2007-01-30
Classification: E21B

Abstract:
1. A rotary drill bit insert comprising: an elongate body rotatable about a central axis, the elongate body having a pair of symmetrical halves symmetrical about the central axis; the elongate body containing a central notch disposed between the symmetric halves of the elongate body; and each symmetrical half comprising: a leading face; a top surface having a leading surface and a trailing relief surface wherein the leading surface and the trailing relief surface being contiguous and non-coplanar; a leading cutting edge at the intersection of the leading face and the leading surface of the top surface; and the leading surface being inclined at a constant angle of inclination in a radial direction with respect to a first radial line projecting from the central axis, and the leading surface being inclined downwardly and rearwardly from the leading cutting edge.