Patent ID: 6186373
Filing Date: 2001-02-13
Classification: B65G,G01F

Abstract:
A bin or hopper discharge assembly comprising:a bin or hopper having at least one bottom slot outlet of effective length L;at least one screw in a trough and rotatable with a screw shaft of diameter d and having flights with a flight diameter f, and an average pitch P and an effective length substantially equal to L, said screw receiving material flowing from said at least one slot outlet;at least one discharge from said screw trough;said screw having a varying average pitch, shaft diameter, and flight diameter, andan effective length L; andsaid screw constructed to correspond to the formula ##EQU3##where f.sub.n, d.sub.n, and P.sub.n are the flight diameter, shaft diameter and pitch of said screw at the nth pitch increment along the length L, and f.sub.L, d.sub.L, and P.sub.L are the flight diameter, shaft diameter, and pitch of the last or final pitch increment under the flow outlet near said screw discharge.