Patent ID: 8684111
Filing Date: 2014-04-01
Classification: E21B,Y10T

Abstract:
1. A drill bit having an axis, the drill bit comprising: a barrel; a cutting member fixed to the barrel, the barrel being arranged to engage a drill shaft for driving the drill bit around the axis, the barrel and the cutting member being adjacently located on the axis; and an aperture centered on the axis, the aperture passing completely through both the cutting member and barrel, wherein the cutting member has a cutting face and a backing face, the faces being spaced apart along the axis and the backing face located adjacent the barrel, wherein the cutting face comprises a plurality of cutting teeth or elements, wherein the backing face comprises a composite having a plurality of diamonds or other super hard constituents and a flange on a radially outermost portion, wherein the flange has a radial width that tapers in the axial direction, and wherein the flange of the cutting member telescopes outwardly of a corresponding flange of the barrel.