Bin closure assembly

Claim 1

IN A BIN HAVING A BOTTOM WALL AND A CIRCULAR DISCHARGE OPENING IN SAID BOTTOM WALL, A CLOSURE ASSEMBLY FOR SAID OPENING COMPRISING A COVER ENGAGED WITH THE OUTER SIDE OF SAID BOTTOM WALL AT A POSITION SURROUNDING SAID OPENING, MEANS ON SAID COVER EXTENDING SUBSTANTIALLY DIAMETRICALLY FROM ONE EDGE THEREOF AND PIVOTALLY CONNECTED TO SAID BOTTOM WALL AT ONE SIDE OF SAID OPENING, MEANS ON SAID COVER EXTENDING FROM A SUBSTANTIALLY DIAMETRICALLY OPPOSITE EDGE THEREOF AT A POSITION THEREBELOW HAVING AN END PORTION CURVED UPWARDLY TOWARD SAID BOTTOM WALL, A LOCKING AND RELEASE ASSEMBLY FOR SAID COVER COMPRISING A PAIR OF HORIZONTALLY SPACED ACTUATING ARMS, SHAFT MEANS PIVOTALLY MOUNTING SAID ARMS ON SAID BOTTOM WALL FOR PIVOTAL MOVEMENT ABOUT A SUBSTANTIALLY HORIZONTAL AXIS DISPOSED BELOW SAID BOTTOM WALL, A LOCKING PIN CONNECTED TO AND EXTENDING BETWEEN SAID ARMS SO THAT SAID LOCKING PIN IS MOVABLE ALONG AN ARC EXTENDED ABOUT THE AXIS OF SAID SHAFT MEANS, SAID CURVED END PORTION OF