Hopper car door actuating mechanism

Claim 1

IN COMBINATION WITH A HOPPER CAR HAVING A HOPPER DOOR PIVOTED TO THE HOPPER ADJACENT THE UPPER EDGE OF THE OPENING, A MECHANISM FOR OPENING SAID CLOSING THE HOPPER DOOR, A SHAFT CONNECTED TO SAID MECHANISM TO OPERATE SAID MECHANISM AND ROTATABLE IN OPPOSITE DIRECTIONS AND HAVING AN OUTER END EXTENDING BEYOND THE SIDE OF THE CAR, SAID SHAFT INCLUDING A UNIVERSAL DRIVING JOINT PERMITTING VERTICAL MOVEMENT OF THE OUTER END OF SAID SHAFT, A WHEEL FIXED TO THE OUTER END OF SAID SHAFT, A RAIL POSITIONED ADJACENT THE PATH OF MOVEMENT OF THE CAR AND ADAPTED TO BE ENGAGED BY SAID WHEEL AS THE CAR MOVES THEREPAST, AND MEANS ACTING BETWEEN A FIXED PORTION OF THE HOPPER CAR AND THE OUTER POSITION OF SAID SHAFT FOR FORCIBLY AND RESILIENTLY URGING SAID WHEEL DOWNWARD INTO DRIVEN ENGAGEMENT WITH SAID RAIL WHEREBY MOVEMENT OF THE HOPPER CAR IN ONE DIRECTION PAST SAIDRAIL WILL CAUSE SAID MECHANISM TO RELEASE THE HOPPER DOOR FOR OPENING AND MOVEMENT OF THE CAR IN THE OPPOSITE DIRECTION PAST SAID RAIL WILL CAUSE SAID MECHANISM TO CLOSE THE HOPPER DOOR.