Patent ID: 8231011

Claim:
A motor driven agitator for separating small material from larger material, the agitator comprising: a frame; a plurality of solid shafts having an elliptical shape cross section rotatably coupled within the frame and operationally coupled to the motor, wherein axes of the plurality of shafts are substantially parallel; and a plurality of screening spaces each having a predetermined spacing, each spacing of the plurality of screening spaces defined between an edge of one shaft and an edge of an adjacent shaft, wherein material placed on a top side of the agitator is agitated by the plurality of shafts while the plurality of shafts rotate, screening small material through the plurality of screening spaces while maintaining the larger material on the top side of the agitator, and wherein the plurality of shafts have timing such that the spacing of the plurality of screening spaces is constant during rotation of the plurality of shafts.