Interlocking end closure flaps on collapsible eight-sided receptacle

Claim 1

A collapsible receptacle formed from a blank of foldable sheet material, comprisng upright first wall panels and second wall panels separated from one another by upright corner panels, each corner panel being angularly disposed relative to the adjacent first and second wall panels and interposed same and being foldably connected thereto, said corner and wall panels delimiting a predetermined area; and bottom-forming first, second, and third flaps foldably connected, respectively, to bottom edges of said first and second wall panels and said corner panels, each third flap having one side edge thereof connected by a first foldline to an adjacent side edge of one of said first flaps, an opposite side edge of each third flap being separated from the adjacent second flap by an elongated slot, the outer end of said first foldline terminating in a notch, each third flap being provided with an outwardly angularly extending second foldline forming said third flaps into contiguous major and minor portions; when forming the receptacle bottom, said first and third flaps being first folded as a unit into the predetermined area whereby the major and minor portions of each third flap are folded relative to one another into face to face relation with the minor portion being sandwiched between the major portion and an adjacent side edge portion of said first flap and then the second flaps being folded into the predetermined area whereby said edge portions of said second flaps extend through and interlockingly engage corresponding notches and are sandwiched between corresponding side edge portions of said first flaps and the minor portions of said third flaps.