Resilient closure latch for containers

Claim 1

IN A CONTAINER INCLUDING A BODY PORTION OPENING UPWARDLY AND HAVING MEANS FOR ENGAGEMENT WITH LIFT MEANS WHEREBY SAID CONTAINER IS NORMALLY SUPPORTED IN AN UPWARDLY-OPENING POSITION WHEN BEING LOADED AND IS INVERTED TO A DOWNWARDLY OPENING POSITION WHEN RAISED AND UNLOADED, SAID BODY PORTION INCLUDING OPPOSITE SIDE WALLS, AT LEAST ONE TOP CLOSURE PANEL PIVOTALLY SECURED TO SAID CONTAINER AND OVERLYING THE UPWARDLY OPENING CONTAINER, TOP CLOSURE LATCH MEANS ON SAID CONTAINER, SAID TOP CLOSURE LATCH MEANS INCLUDING RELEASABLE MEANS SECURING SAID CLOSURE IN SEALING RELATION TO SAID CONTAINER WHEN SAID CONTAINER IS IN AN UPRIGHT POSITION, SAID LATCH MEANS INCLUDING MEANS FOR RETAINING SAID CONTAINER CLOSURE IN SUBSTANTIALLY SEALING RELATIONSHIP TO SAID CONTAINER WHILE SAID CONTAINER IS BEING INVERTED, SAID RELEASABLE MEANS INCLUDING MEANS FOR RELEASING SAID CONTAINER CLOSURE TO PERMIT SAID CLOSURE TO FULLY OPEN UNDER THE INFLUENCE OF GRAVITY WHEN SAID CONTAINER REACHES THE SUBSTANTIALLY INVERTED DUMPING POSITION, SAID RELEASABLE MEANS INCLUDING A SPRING, SAID SPRING HAVING A FIRST END AND A SECOND END, SAID FIRST END HAVING MEANS SECURING SAID SPRING TO A PORTION OF SAID CONTAINER, EACH SECOND END OF SAID SPRING TERMINATING IN A FREE END, MEANS SECURED TO ANOTHER PORTION OF SAID CONTAINER RELEASABLY ENGAGING SAID FREE END OF SAID SPRING AND PERMITTING RELATIVE MOVEMENT AND SEPARATION THEREBETWEEN.