Base sheet of corrugated cardboard or other stiff sheet material for use in forming various three-dimensional articles, and kit including same

A kit comprising a cardboard base sheet cut according to a predetermined configuration, and including a predetermined arrangement of fold lines to enable the cardboard base sheet to be foldable from a flat condition to a three-dimensional condition defining an article having a rectangular bottom wall and four erect side walls;

• said predetermined arrangement of fold lines including:
• (a) a plurality of fold lines in the central region of the cardboard sheet to define said bottom wall on the inner side of the fold lines and said side walls on the outer side of said fold lines;
• and (b) a fold line midway in each side wall to define an outer section of the side wall foldable over an inner section of the side wall;
• said outer section of each side wall, when folded over the inner section of the respective side wall, including an outer edge engageable with said bottom wall to firmly retain the respective side wall erect in the three-dimensional condition of the article and to expose for view a folded edge, rather than a cut edge, of each side wall;
• said kit further comprising at least one partition to be applied between two opposed side walls of the three-dimensional article when in its three-dimensional condition;
• said partition being defined by another sheet of cardboard bent over itself at a mid-portion thereof to expose for view only the folded edge, rather than a cut edge, and to define two parallel sections, each formed with a bendable flap at its opposite ends;
• the outer section of said two opposed side walls being each formed with a slot for receiving said partition sheet with the flaps of the partition received between the outer and inner sections of the respective side wall.

A sheet of corrugated cardboard cut according to a predetermined configuration, and including a predetermined arrangement of fold lines to enable the cardboard sheet to be foldable from a flat condition to a three-dimensional condition defining an article having a polygonal bottom wall circumscribed by a plurality of erect side walls;

• said predetermined arrangement of fold lines including:
• (a) a plurality of fold lines in the central region of the cardboard sheet to define said bottom wall on the inner side of the fold lines and said side walls on the outer side of said fold lines;
• and (b) a fold line midway in each side wall to define an outer section of the side wall foldable over an inner section of the side wall;
• said outer section of each side wall, when folded over the inner section of the respective side wall, including an outer edge engageable with said bottom wall to firmly retain said side walls erect in the three-dimensional condition of the article;
• said base sheet being cut, and being formed with further fold lines, to define a bendable flap on each of the outer sections of alternative side walls each insertable between the inner and outer sections of the adjacent side walls;
• the outer sections of said side walls having said flaps, and the inner sections of said adjacent side walls, including interengaging ribs and recesses for firmly retaining the outer sections of all of said side walls in an erect position with respect to said bottom wall in the three-dimensional condition of the article.