Variable flow feed auger for delivering from sealed storage bins

Claim 1

IN COMBINATION WITH A SILO ADAPTED TO BE HERMETICALLY SEALED AND HAVING A CONCAVE CONICAL BASE WITH A SIDE WALL PROJECTING THEREABOVE AND DEFINING A HOLE ADJACENT THE TOP OF THE BASE, A DELIVERY TUBE ANCHORED TO SAID BASE AND PROJECTING IN SEALED RELATION THROUGH SAID HOLE AND EXTENDING TO ABOUT 18 INCHES FROM THE BOTTOM OF SAID BASE, A SLEEVE HAVING DEFORMABLE SEALS IN ITS ENDS CLAMPED TO THE OUTER END OF SAID TUBE, AN EXTENSION TUBE PROJECTING ADJUSTABLY INTO THE SEAL AT THE OUTER END OF SAID SLEEVE AND RELEASABLY CLAMPED THERETO, A DISCHARGE TUBE OPENING LATERALLY FROM SAID EXTENSION TUBE, MEANS MOUNTED ON SAID EXTENSION TUBE ARRANGED TO CLAMP A CLOSURE IN SEALING RELATION TO THE END OF SAID DISCHARGE TUBE, A CONVEYOR DRIVE SHAFT JOURNALED IN SAID EXTENSION TUBE AND PROJECTED THROUGH THE ENDS THEREOF AND THROUGH THE LOWER END OF SAID DELIVERY TUBE, A MOTOR MOUNTED ON SAID EXTENSION TUBE AND CONNECTED TO DRIVE SAID DRIVE SHAFT AT CONSTANT SPEED, AND AN AUGER SCREW ON SAID DRIVE SHAFT ARRANGED TO PROJECT AT ITS LOWER END AT VARIABLE DISTANCES FROM THE LOWER END OF SAID DELIVERY TUBE DEPENDING ON THE ADJUSTMENT OF SAID EXTENSION TUBE AND SLEEVE RELATIVE TO SAID DELIVERY TUBE.