Power and free conveyors

Claim 1

A MATERIAL CONVEYOR COMPRISING A MOVABLE TROLLEY, A TRACK ALONG WHICH SAID TROLLEY MOVES, A HOOK, A ROTATABLE CONNECTION BETWEEN SAID HOOK AND TROLLEY WHEREBY THE HOOK CAN BE ROTATED TO POSITION THE OPEN PART OF THE HOOK IN DIFFERENT POSITIONS IN THE HORIZONTAL PLANE, A LOOP CARRIED BY SAID HOOK, A SECOND TROLLEY, A ROTATABLE CONNECTION BETWEEN THE LOOP AND SECOND TROLLEY WHEREBY THE HOOK AND LOOP CAN BE ROTATED WITHOUT CREATING RELATIVE ROTATION BETWEEN THE TWO TROLLEYS, AND A TRACK FOR THE SECOND TROLLEY INTERPOSED IN THE PATH OF MOVEMENT OF THE SECOND TROLLEY WHEN CARRIED BY THE FIRST TROLLEY SO AS TO RECEIVE AND SUPPORT THE SECOND TROLLEY AT A SELECTED POINT.