Patent ID: 8636150
Filing Date: 2014-01-28
Classification: B07B

Abstract:
1. A screening device for separating smaller and larger aggregate materials from a mixed aggregate stream flowing through the screening device along a path from upstream to downstream by force of gravity, comprising: at least two decks, with an upper deck disposed upstream before a lower deck disposed downstream of the upper deck, each deck separately adjustable from about 10 to about 70 degrees along the path, and each deck having a deck frame, the frame further divided into a grid with separate openings for receiving a panel therein, wherein each panel is either an impervious blank or a screen, the screens having openings therein to selectively permit smaller aggregate to pass through the screen thereunder, while the larger aggregates must pass over the screens; such that a path for the aggregate stream is provided over the upper deck and the lower deck permitting smaller aggregate to fall through the screens while larger aggregate remains in the aggregate stream.