Collapsible container

Claim 1

AN EASILY COLLAPSIBLE AND ERECTABLE CONTAINER HAVING AN UPPER AND A LOWER END, COMPRISING: AN UPPER HORIZONTAL WALL SERVING AS THE TOP WALL OF THE CONTAINER WHEN THE CONTAINER IS IN ITS ERECT POSITION; A PAIR OF OPPOSED VERTICAL SIDE WALLS EACH HAVING AN UPPER AND A LOWER END; EACH OF SAID SIDE WALLS BEING PIVOTALLY MOUNTED AT ITS UPPER AND LOWER ENDS TO THE UPPER AND LOWER ENDS OF THE CONTAINER, RESPECTIVELY; EACH OF SAID PAIR OF SIDE WALLS BEING DIVIDED INTO TWO SECTIONS; MEANS HINGING THE TWO SECTIONS TOGETHER PERMITTING THEM TO FOLD ALONG A HORIZONTAL LONGITUDINAL LINE; A PAIR OF OPPOSED VERTICAL END WALLS EACH HAVING AN UPPER AND LOWER END; EACH OF SAID END WALLS BEING PIVOTALLY MOUNTED AT ITS UPPER END TO THE UPPER END OF THE CONTAINER AND FREE AT ITS LOWER END; A LOWER HORIZONTAL WALL; AND MEANS FOR MOUNTING SAID LOWER HORIZONTAL WALL; SAID LATTER MEANS CONSISTING OF MOUNTING ELEMENTS WHICH MOUNT THE LOWER HORIZONTAL WALL SO THAT IT IS SUPPORTED IN POSITION SPACED BELOW THE UPPER HORIZONTAL WALL AND IN ENGAGEMENT WITH THE SIDE AND END WALLS WHEN THE CONTAINER IS ERECT BUT IS UNSUPPORTED WHEN THE CONTAINER IS INVERTED, AND WHICH PERMIT THE PIVOTING OF THE SIDE AND END WALLS SO THAT ONLY SAID LOWER HORIZONTAL WALL WHEN SO POSITIONED LOCKS SAID SIDE AND END WALLS AGAINST COLLAPSE, WHEREBY MERELY INVERTING THE CONTAINER CAUSES THE LOWER HORIZONTAL WALL TO DROP ON TOP OF THE UPPER HORIZONTAL WALL BY GRAVITY, AND THEREBY FREES THE SIDE AND END WALLS TO COLLAPSE THEREON ALSO BY GRAVITY, THE CONTAINER BEING ERECTABLE BY MERELY RE-INVERTING IT AND PULLING UP ON THE TOP WALL UNTIL THE LOWER HORIZONTAL WALL LOCKS THE SIDE AND END WALLS IN POSITION.