Patent ID: 7735700

Claim:
An assembly for controlling gravity flow delivery of granular or powdered material from a bin opening, comprising: a single movable bin gate for closing the bin opening and providing a high flow rate of material when the bin gate is open, wherein a low flow aperture is formed in the bin gate to provide a low flow rate of material when the bin gate is positioned such that only the low flow aperture is exposed to the bin opening; a controller for controlling positioning of the bin gate to select a flow rate of material from the bin opening; and a flow enhancer, for transporting and urging material to exit through the low flow aperture, a first stage of the flow enhancer comprising paddles positioned on a rotating shaft that extends across the bin opening such that the paddles are angled to impel material toward a second stage, and the second stage of the flow enhancer comprising paddles positioned on the rotating shaft to break up material bridging above the low flow aperture and angled to impel material in a gravity flow direction to exit the low flow aperture.