Patent ID: 8528990

Claim:
An apparatus for use on a portion of a milling or mining drum, adapted to be rotated in a cutting direction about a cylindrical axis defined by said drum, the apparatus comprising: a base portion adapted to be mounted to said drum, comprising an upper surface and a lower surface, and an opening having a first seat proximate the upper surface; a cutter bit including a tip region having a working end attached to a carbide substrate, the working end having a pointed geometry and having a hardness similar to diamond, the cutter bit further including a flange having a nut-like gripping surface and a shank portion extending away from the tip region to a distal end, at least the distal end of the shank portion including a threaded portion, the shank portion of the cutter bit being received in the base portion opening at a fixed position relative to the base portion; wherein the opening of the base portion is internally threaded and engages the threaded portion of the shank portion of the cutter bit, and the base portion includes a lower region that has a second threaded portion of smaller diameter than the threaded portion engaging the shank portion of the cutter bit; wherein a retainer is internally threaded into the opening of the base portion and threadably engaged in the second threaded portion; and wherein the cutter bit working end comprises a material selected from diamond, polycrystalline diamond, natural diamond, synthetic diamond, vapor deposited diamond, silicon bonded diamond, cobalt bonded diamond, thermally stable diamond, infiltrated diamond, layered diamond, cubic boron nitride, diamond impregnated matrix, diamond impregnated carbide, metal catalyzed diamond, or combinations thereof.