Silo unloader

Claim 1

A MATERIAL UNLOADER FOR USE IN A SILO HAVING AN UPRIGHT SILO WALL WITH A SERIES OF OPENINGS IN ONE SIDE THEREOF COMPRISING: A MAIN FRAME STRUCTURE INCLUDING AN INVERTED CUP-SHAPED IMPELLER CHAMBER HAVING AN UPRIGHT WALL WITH A LOWER TERMINAL EDGE AND A SIDE DISCHARGE OPENING IN THE WALL; MEANS SUPPORTING THE FRAME STRUCTURE SUBSTANTIALLY AT THE CENTER OF THE SILO; A VERTICAL DRIVE SHAFT EXTENDING THROUGH AND CONCENTRIC WITH THE AXIS OF THE CHAMBER WITH A LOWER END BELOW THE CHAMBER; AN IMPELLER INCLUDING AT LEAST ONE LATERALLY EXTENDING AND VERTICALLY DISPOSED IMPELLER BLADE FIXED TO THE SHAFT WITH AN OUTER UPRIGHT EDGE CLOSELY ADJACENT THE WALL AND A LOWER EDGE SUBSTANTIALLY COPLANAR WITH THE LOWER EDGE OF THE WALL; SWEEP MEANS DISPOSED RADIALLY IN THE SILO BENEATH THE CHAMBER AND EXTENDING SUBSTANTIALLY FROM THE CENTER TO THE WALL OF THE SILO AND INCLUDING A LATERALLY EXTENDING AUGER DRIVE SHAFT, AN AUGER FLIGHTING ON THE SHAFT OUTBOARD OF THE CHAMBER AND TERMINATING ADJACENT THE WALL OF THE CHAMBER; A FLIPPER FIXED TO AND EXTENDING RADIALLY FROM THE AUGER SHAFT BENEATH AND INBOARD OF THE CHAMBER AND ADAPTED TO FLIP MATERIAL UPWARDLY IN THE PATH OF THE IMPELLER BLADE; DRIVE MEANS BETWEEN THE LOWER END OF THE DRIVE SHAFT AND THE AUGER DRIVE SHAFT; AN AUGER DISCHARGE HOUSING HAVING ONE END CONNECTED TO THE CHAMBER ADJACENT TO AND FOR RECEIVING MATERIAL THROUGH THE SIDE DISCHARGE OPENING, AND EXTENDING THEREFROM THROUGH AN OPENING IN THE SILO WALL, AN AUGER WITHIN THE AUGER HOUSING FOR DISCHARGING MATERIAL THROUGH THE OPENING; AND A DRIVE MECHANISM FOR EFFECTING ROTATION OF THE SWEEP MEANS OVER THE SURFACE OF THE SILAGE.