Corrugated polygonal container

Claim 1

A polygonal shipping container having a tubular main body portion and integral top and bottom end closure flaps formed of three die-cut blanks of corrugated paper board stock, said blanks being respectively transversely scored along perimetrally spaced parallel score lines and adhesively secured together in laminated relation to provide said main body portion with a triple layered substantially continuous polygonally shaped side wall opposite halves of which each include at least three side wall panels, said panels being relatively foldable in the regions of all of said score lines for erecting said main body portion into polygonal shape, the two outermost laminations of said sidewalL each having a single pair of diametrically spaced sets of closely adjoining score lines for flat folding said opposite halves of the tubular main body portion one against the other at two diametrically opposed corners of said container, said diametrically spaced sets of score lines in said two outermost laminations being respectively disposed in nested relation about a fold line of the innermost lamination to form at said diametrically opposed corners of said container outwardly projecting triple-layered ribs or flutes which permit unstressed flat folding of the opposite halves of the container as aforesaid and serve as hand holds to facilitate rolling of the containers about their central axes and vertical side-wise stacking of the containers when erected into polygonal shape, the outermost lamination of said side wall being perimetrally scored and vertically slit to integrally provide the same with a plurality of inwardly foldable end closure flaps respectively hinged to the top and bottom edges of each of said side wall panels, said closure flaps being each of a length substantially equal to one half the distance between opposite side wall panels of the erected container, the said pairs of said flaps being respectively adapted to be inturned from opposite side wall panels of the erected container toward the central axis thereof for coplanar disposition with their free edges in abutting relation along angularly related lines commonly intersecting said central axis of the container whereby said inturned pairs of the end closure flaps conjointly form a multi-layered closure at each end of the container.