Abstract: A three-dimensional article produced from sheet material and comprising a frame unit having a plurality of outer sides made of sheet material each of which having a different angular disposition is provided. First and second longitudinal ends of the frame unit are interconnected by a female fastener embedded in the first end and by a male fastener introduced through the second end and coupled with the female fastener. A kit for assembling the three-dimensional article comprising a plurality of expandable separate members made from sheet material and set in a flat condition is also provided.

Abstract: A kit for use in producing a three-dimensional article from flat cardboard sheets, includes: a cardboard assembly of flat cardboard sheets, each cut according to a predetermined configuration and formed with a predetermined arrangement of fold lines such as to permit the cardboard assembly to be folded from a flat condition for shipping and handling, to a three-dimensional condition defining a three-dimensional article having dimensional stability, structural rigidity and a pleasing appearance. Disclosed, for purposes of example, are kits for producing a stool, a chair, a desk and a table.

Abstract: A base sheet of stiff material, particularly corrugated cardboard, is cut according to a predetermined configuration, is formed with a predetermined arrangement of fold lines, to enable the sheet to be foldable into a three-dimensional article having a polygonal bottom wall circumscribed by a plurality of erect side walls. One described embodiment is in the form of a kit including such a base sheet cut and formed with fold lines to define a rectangular unit, the kit also including further cardboard sheets to define partitions for the unit. A second embodiment is described wherein the base sheet is cut to define a unit of a modular configuration permitting a plurality of such units to be assembled in a modular fashion to define a shelf or bookcase.

Abstract: A kit for use in producing a three-dimensional article from flat cardboard sheets, includes: a cardboard assembly of flat cardboard sheets, each cut according to a predetermined configuration and formed with a predetermined arrangement of fold lines such as to permit the cardboard assembly to be folded from a flat condition for shipping and handling, to a three-dimensional condition defining a three-dimensional article having dimensional stability, structural rigidity and a pleasing appearance. Disclosed, for purposes of example, are kits for producing a stool, a chair, a desk and a table.