Multiple deck vibrating screen apparatus

Abstract

A vibrating screen apparatus for effecting screening of materials includes a frame with first and second vibrating screen deck units mounted one above the other in it. To provide maximum flexibility of operation, the vibrating deck units are pivoted at the material feed end on the frame. Hydraulic cylinders are attached between the free ends of the first and second vibrating screen deck units and the frame for independently varying the angle or slope of each of the deck units, relative to the frame, for adjusting the dwell time of material passing over the deck units. A flexible corrugated rubber curtain extends between the upper deck unit and the lower deck unit to ensure that material which passes through the upper deck unit is guided onto the surface of the lower deck unit. In addition, each of the vibrating screen deck units has an independent vibrator mechanism on it; so that the vibration rate and magnitude may be independently adjusted for each of the deck units in the system.

Dependencies are inferred from the claim text.