Patent ID: 7007877
Filing Date: 2006-03-07
Classification: B07B,E02F

Abstract:
1. A screening apparatus for screening a particulate material composed of particles of different size, said apparatus including: a screen frame having an open bottom through which screened particles can pass; a plurality of banks of blades supported on the screen frame; each bank having a plurality of evenly spaced blades arranged in a row and rotatable about a respective axis, the axes being parallel to each other, with adjacent banks of blades axially offset relative to each other so that the blades of one bank alternate with the blades of an adjacent bank, and wherein at least one bank of blades is linearly slidable along its axis of rotation to provide a predetermined amount of axial freeplay and where sizing gaps are formed between mutually adjacent blades of adjacent banks; wherein, when the blades are rotated and a particulate material is placed on the blades, the rotating blades agitate and/or crush the material to allow particles of a size equal to or smaller than an adjacent sizing gap to pass between the blades and through the open bottom.