Corner hinge construction

Claim 1

IN A BOX CONSTRUCTED OF A MATERIAL HAVING THE FLEXIBLE CHARACTERISTICS OF CARDBOARD, A BODY SECTION, A COVER SECTION ADAPTED TO OVERLIE SAID BODY SECTION, SAID BODY AND COVER SECTIONS EACH HAVING FRONT, REAR AND SIDE WALLS, HINGE MEANS FOR HINGEDLY ATTACHING SAID SECTIONS TO EACH OTHER WITH THEIR WALLS IN SUBSTANTIALLY EDGE-TO-EDGE ABUTTING RELATION, SAID HINGE MEANS INCLUDING A PAIR OF HINGE ELEMENTS THAT ARE POSITIONED AT THE REAR CORNERS OF SAID BOX, EACH OF SAID HINGE ELEMENTS INCLUDING A FIRST AND SECOND PLATE, SAID PLATES BEING HINGEDLY ATTACHED TO EACH OTHER AND EACH PLATE OVERLYING THE INNER SURFACE OF THE REAR WALL OF ITS ASSOCIATED SECTION AT THE OPPOSITE END PORTION THEREOF, EACH OF SAID PLATES BEING IN ENGAGEMENT WITH SAID INNER SURFACE OF THE REAR WALL OF ITS ASSOCIATED SECTION BUT OTHERWISE DISCONNECTED THEREFROM, FLANGES INTEGRALLY JOINED TO SAID PLATES AND EXTENDING PERPENDICULARLY FROM THE SIDES THEREOF, EACH OF SAID FLANGES ENGAGING THE INNER SURFACE OF THE ADJACENT SIDE WALL OF THE ASSOCIATED SECTION AND BEING IN SUBSTANTIALLY THE SAME PLANE, THE EDGE OF EACH OF SAID FLANGES THAT IS ADJACENT THE OUTER EDGE OF THE ASSOCIATED PLATE BEING COEXTENSIVE THEREWITH, THE OTHER EDGE OF EACH OF SAID FLANGES THAT IS ADJACENT THE HINGE AXIS OF SAID HINGE ELEMENTS BEING FORESHORTENED WITH RESPECT TO THE EDGE OF SAID PLATE ADJACENT THERETO, AND MEANS FOR SECURING EACH OF SAID FLANGES TO ITS RESPECTIVE SIDE WALL.