Patent ID: 7284721
Filing Date: 2007-10-23
Classification: B02C

Abstract:
1. A rotating shaft impactor assembly comprising: (a) an impactor chamber; (b) a rotatable impelling device located in the impactor chamber; and (c) a plurality of single-anvil elements arranged adjacent one another at an inner peripheral wall of said chamber, each element with a breakage face oriented to receive material thereonto for breakage, the material being directed onto the breakage face in use by ejection from the rotatable impelling device, the anvil elements being arranged discretely and spaced apart in the chamber such that the breakage face of an element is not obscured by an adjacent element so that the travel of material onto the breakage face of that element is uninterrupted by the adjacent anvil element; wherein the breakage face is provided on a main body of each anvil element and wherein a vertically-oriented bevelled corner is located at a spaced-apart end of the main body which is opposite to said breakage face, the vertically-oriented bevelled corner being arranged to abut the inner peripheral wall of the impactor chamber, and being angularly disposed relative to the breakage face such that the angle of the bevel predetermines the breakage face orientation.