Entrance switch for conveyors

Claim 1

IN A CONVEYOR SYSTEM, THE COMBINATION COMPRISING A MAIN TRACK, A PLURALITY OF TROLLEY UNITS ADAPTED TO BE MOVED ALONG THE MAIN TRACK, A MAIN CONVEYOR ADAPTED TO ENGAGE SAID TROLLEY UNITS AND MOVE THEM ALONG THE MAIN TRACK, A BRANCH TRACK FOR GUIDING SIMILAR TROLLEY UNITS, SAID MAIN TRACK AND BRANCH TRACK HAVING PORTIONS THEREOF CONVERGING TO GUIDE THE TROLLEY UNITS FROM THE BRANCH TRACK TO THE MAIN TRACK, AN ENDLESS TRANSFER CONVEYOR POSITIONED ADJACENT SAID MAIN TRACK AND DERIVING POWER DIRECTLY THEREFROM, SAID TRANSFER CONVEYOR HAVING PORTIONS THEREOF POSITIONED AND TRAVELING ADJACENT THE CONVERGING PORTION OF SAID BRANCH TRACK, MEANS ON SAID TRANSFER CONVEYOR FOR ENGAGING A TROLLEY UNIT ON THE BRANCH TRACK, AND AN ENTRANCE SWITCH FOR CONTROLLING THE MOVEMENT OF THE TROLLEY UNITS INTO POSITION FOR ENGAGEMENT BY SAID TRANSFER SWITCH, SAID ENTRANCE SWITCH COMPRISING A PUSHER DOG ADAPTED TO ENGAGE A TROLLEY UNIT AND MOVE IT IN THE DIRECTION OF THE BRANCH TRACK TOWARD THE MAIN TRACK, AND MEANS RESPONSIVE TO THE MOVEMENT OF SAID MEANS ON THE TRANSFER CONVEYOR INTO POSITION FOR ENGAGEMENT WITH A TROLLEY UNIT ON THE BRANCH TRACK FOR MOVING AND ACCELERATING THE PUSHER DOG TO THEREBY MOVE THE TROLLEY UNIT POSITIVELY IN POSITION FOR ENGAGEMENT BY SAID MEANS ON THE TRANSFER CONVEYOR.