End closure for a multi-walled container

Claim 1

A multi-walled container formed from an open ended sleeve having a substantially rectangular cross section and formed by side walls interconnected by corner forming fold lines and made from a plurality of layers of corrugated board, end closure means for closing at least one open end of said sleeve, a said end closure means including a main substantially triangular end panel having a first and a second connecting flap means foldably connected to a pair of adjacent shorter side edges of said main triangular end panel by a first and a second fold line respectively, third and fourth fold lines substantially parallel to said first and second fold lines respectively and dividing said first and said second connecting flap means respectively each into a connecting panel and a securing flap, said connecting panel in said first connecting flap means being positioned between said first and third fold lines and said connecting panel in said second connecting flap being means between said second and fourth fold lines, the distances between said first and third and between said second and fourth fold lines being substantially equal to the thickness of said walls of said sleeve, a diagonal fold line dividing said triangular panel into a pair of symmetrical smaller triangular panels, said diagonal fold line extending between a longest edge of said main triangular panel and an intersection of said pair of shorter side edges of said main triangular panel, means securing said flap of said first flap means into face to face relationship with an outside surface of one wall of a first pair of adjacent side walls of said sleeve and means securing said flap of a said second securing flap means into face to face relationship with an outside surface of another wall of said first pair of adjacent side walls of said sleeve, and wherein each of said third and fourth fold lines is positioned adjacent the intersection of the outer surface of the side wall to which its adjacent flap is secured and an adjacent end edge of said sleeve, said end closure means being dimensioned to correspond with the cross section of said sleeve whereby any tendency for said walls of said sleeve to be deflected outward is immediately transmitted to said main triangular panel and said main triangular panel forms at least a portion of a bridge extending across said one open end of said sleeve and deflection of said first pair of side walls of said sleeve outwardly is resisted by tension in said main triangular panel.