Unloading conveyor arrangements

Claim 1

IN AN UNLOADING CONVEYOR ARRANGEMENT OF A COMBINE STORAGE BIN OR THE LIKE, SAID BIN HAVING AN ELONGATED GRAVITY DISCHARGE SLOT THEREIN, MEANS DEFINING A FIRST ENDLESS BELT CONVEYOR HAVING AN UPPER CONVEYING SURFACE ADAPTED TO RECEIVE MATERIAL FROM SAID DISCHARGE SLOT AND EFFECTIVE TO DELIVER SUCH MATERIAL TO A LOCATION EXTERNAL TO SAID BIN, MEANS DEFINING A SECOND ENDLESS BELT CONVEYOR HAVING AN UPPER CONVEYING SURFACE ADAPTED TO RECEIVE MATERIAL DISCHARGED FROM SAID FIRST CONVEYOR AND TO CONVEY SUCH MATERIAL TO A REMOTE DISCHARGE POSITION, MEANS PIVOTALLY INTERCONNECTING SAID CONVEYORS AND ACCOMMODATING MOVEMENT OF SAID SECOND CONVEYOR TO AN ANGULARLY RELATED POSITION AT WHICH THE SECOND CONVEYOR IS INOPERATIVE, AND A COMMON DRIVE MEANS FOR SAID FIRST AND SECOND CONVEYORS AND INCLUDING A SINGLE ANGULAR DRIVE UNIT LOCATED AT SUBSTANTIALLY THE REGION OF OVERLAP OF THE TWO CONVEYORS, SAID DRIVE UNIT HAVING AN INPUT SHAFT PROJECTING FROM SAID DRIVE UNIT THROUGH THE BIN FOR CONNECTION TO A PRIME MOVER, SAID DRIVE UNIT ALSO HAVING AN OUTPUT SHAFT, SAID MEANS CONNECTING SAID CONVEYORS TO SAID OUTPUT SHAFT ONLY WHEN SAID CONVEYORS ARE IN THEIR DRIVING, OVERLAPPED RELATION.