Patent ID: 6962300

Claim:
An apparatus for grinding material comprising: a grinder frame; a grinding means mounted to the frame; a drive means operatively connected to the grinding means; a rotatable drum assembly having a rotatable circumvolving side wall, a stationary bottom surface, and defining therein a rotating drum space, the bottom surface having an opening therethough for the passage of material to be ground, the rotatable drum assembly attached to the grinder frame in a position for alignment of the opening in the bottom surface with the grinding means for allowing the passage of material to be ground from the drum space into the grinding means; means for rotating the rotatable side wall; and a stationary drum assembly having a frustoconical stationary side wall configured to aid in feeding material into the rotatable drum space the stationary side wall having a smaller diameter end adjacent to the rotatable drum assembly and a larger diameter end, positioned atop the rotatable drum; whereby material is loaded into the larger diameter end of the frustoconical stationary sidewall, the material passes through the stationary side wall into the rotatable drum space where the material is contacted by the grinding means through the opening in the bottom surface of the rotatable drum assembly.