Patent ID: 7416145

Claim:
A rotary impact mill, comprising: a milling chamber being defined by a housing with an inlet, an outlet, and at least one wall; a plurality of rectangularly shaped impact hammers fastened to and longitudinally disposed along a rotor assembly connected to a rotary driving mechanism; at least one of the impact hammers comprising a body having a first hardness; the impact hammer also comprising a plurality of wear resistant, rounded inserts, fixed within recesses formed in the body and protruding beyond a surface of an impact side of the body proximate a distal end of the body, wherein the wear resistant inserts comprise a cemented metal carbide base segment attached to a distal end of the body and a hard surface comprises a layer of diamond or cubic boron nitride which is bonded to the base segment wherein the rounded inserts comprise a substantially conical end protruding beyond an impact side of the hammer body wherein the conical end comprises a rounded apex.