Rolling conveyor systems

Claim 1

IN A CONVEYOR SYSTEM FOR BULK MATERIAL, IN COMBINATION: A CONTINUOUS CONVEYOR TRACK HAVING AN UPPER FORWARDTRACK PORTION AND A LOWER RETURN-TRACK PORTION LYING IN A COMMON VERTICAL PLANE AT LEAST ALONG PART OF SAID TRACK; A CHAIN OF OPEN-TOP CONVEYOR CARS RIDING ON SAID TRACK, SAID CARS EACH BEING PROVIDED WITH A RESPECTIVE SWIVEL COUPLING AT THE OTHER END OF EACH CAR, TYING THE ADJACENT CARS TOGETHER THE FREEDOM OF RELATIVE ANGULAR MOVEMENT BETWEEN ADJACENT CARS; A RETURN STATION ALONG SAID TRACK INCLUDING AN ARCUATE TRACK SECTION LYING IN THE VERTICAL PLANE OF SAID TRACK PORTIONS AND INTERCONNECTING SAME FOR DIVERTING SAID CHAIN OF CARS FROM SAID UPPER TRACK PORTION TO SAID LOWER TRACK PORTION ABOUT SAID TRACK SECTION WHILE DISCHARGING THE OPEN-TOP CARS OF THE BULK MATERIAL CARRIED THEREIN UPON THE PASSAGE OF SAID CARS ABOUT SAID SECTION; DRIVE MEANS FOR ADVANCING SAID CHAIN OF CARS THROUGH SAID SECTION; AND A ROTATABLE PULLEY ENTERED ON THE RADIUS OF CURVATURE OF SAID TRACK SECTION AND LYING IN SAID VERTICAL PLANE, SAID PULLEY HAVING A RESILIENTLY DEFORMABLE PERIPHERY ENGAGEABLE WITH SAID CARS FOR YIELDABLY RETAINING SAME DURING MOVEMENT OF SAID CARS ABOUT SAID SECTION.