Drive for trolley conveyor system

Claim 1

IN A TROLLEY CONVEYOR SYSTEM INCLUDING A TRACK, A SERIES OF LONGITUDINALLY SPACED CONVEYOR TROLLEYS MOVABLY CARRIED BY THE TRACK, AND A MOVABLE CABLE ASSEMBLY TO WHICH THE TROLLEYS ARE SECURED, THE IMPROVEMENT COMPRISING: SUPPORT MEANS FIXED WITH RESPECT TO SAID TRACK; A FIRST POWER DRIVEN SPROCKET AND A SECOND LONGITUDINALLY SPACED SPROCKET CARRIED BY SAID SUPPORT MEANS LATERALLY OF SAID TRACK, A SPROCKET CHAIN LOOP INTERCONNECTING SAID SPROCKETS; A SERIES OF LONGITUDINALLY SPACED DRIVE DOGS ON SAID CHAIN EXTENDING OUTWARDLY THEREOF SO AS TO OPERATIVELY AND DRIVINGLY ENGAGE SUCCESSIVELY THE RESPECTIVE TROLLEYS ON SAID TRACK; AND A CHAIN PUSH-OUT BAR ADJACENT SAID SUPPORT BEARING AGAINST THE CHAIN LOOP, ADJACENT SAID CABLE ASSEMBLY FOR MAINTAINING SAID CHAIN AND CONNECTED DOGS IN SUCCESSIVE DRIVING REGISTRY WITH SAID CONVEYOR TROLLEYS RESPECTIVELY, SAID MOVABLE CABLE ASSEMBLY INCLUDING A SERIES OF UNIT CABLE ELEMENTS AT THEIR ENDS SECURED TO AND FLEXIBLY INTERCONNECTING ADJACENT PAIRS OF CONVEYOR TROLLEYS, AND AN ENLARGED HEAD SECURED UPON OPPOSITE ENDS OF EACH CABLE ELEMENT, THE HEADS ON THE ENDS OF ADJACENT CABLE ELEMENTS BEING NESTED AND SECURED WITHIN A PAIR OF TROLLEY BRACKETS AND FIXED AGAINST LONGITUDINAL MOVEMENT IN EITHER DIRECTION.