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A container having a number of walls of cardboard, fiberboard, plastic or other relatively stiff sheet material, joined along corner edges is made collapsible by providing one or more accordion folds transverse to the corner edges. Each accordion fold includes parallel crease lines on a common side

A container having a number of walls of cardboard, fiberboard, plastic or other relatively stiff sheet material, joined along corner edges is made collapsible by providing one or more accordion folds transverse to the corner edges. Each accordion fold includes parallel crease lines on a common side of the walls, an intermediate crease line on an opposite side of the walls, and diagonally opposed areas of locally weakened stiffness in the wall material adjacent each intersection of the intermediate crease with the corner edges, such that portions of each accordion fold tend to overlap at the corner edges to facilitate bellowing action of the accordion fold.

대표청구항 ▼

For making a collapsible container, a sheet of corrugated cardboard cut and scored transversely to a longitudinal dimension to define a plurality of wall panels and a plurality of flaps foldable for making a rectangular box with a bottom, one or more accordion folds extending longitudinally on said

For making a collapsible container, a sheet of corrugated cardboard cut and scored transversely to a longitudinal dimension to define a plurality of wall panels and a plurality of flaps foldable for making a rectangular box with a bottom, one or more accordion folds extending longitudinally on said sheet, each said fold including parallel crease lines on a common side of said sheet and an intermediate crease line on an opposite side of said sheet and diagonally opposed areas of crushed corrugation in said cardboard adjacent to each intersection of said intermediate crease with said transverse creases.