Patent ID: 7591377

Claim:
An aggregate separation device, comprising: a container; a suspension system coupled to the container; a screen coupled to the suspension system, the screen configured with a plurality of perforations having a first diameter; a hollow shaft coupled to the screen, the hollow shaft having first and second ends; a first support structure coupled to a center portion of the hollow shaft, wherein the first and second ends of the hollow shaft are coupled to first and second sides of the first support structure; an unbalanced rod displaced within the hollow shaft, the unbalanced rod being supported on each end of the unbalanced rod by first and second support bearings; a mechanical energy source coupled to the unbalanced rod and adapted to rotate the unbalanced rod to transfer vibrational energy to the screen via the hollow shaft; and a third support bearing coupled to a center portion of the unbalanced rod to prevent excessive deflection of the unbalanced rod during rotation, wherein the third support bearing is enclosed within the first support structure outside of the hollow shaft.