Collapsible boxes

Details Collapsible boxes Collapsible boxes

1989-02-27

1990-07-03

Elkins, Gary

Envelopes, wrappers, and paperboard boxes

Paperboard box

Variable volume

229920, 229DIG2, 229DIG3, 229DIG4, 493 58, 493185, B65D 542

Patent

active

049384139

ABSTRACT:
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.

REFERENCES:
patent: 1876063 (1932-09-01), Kronenberger
patent: 2486563 (1949-11-01), Jorgensen
patent: 2747380 (1956-05-01), Ridnour
patent: 4160519 (1979-07-01), Gorham
patent: 4284227 (1981-08-01), Corey
patent: 4694954 (1987-09-01), Moss
patent: 4817803 (1989-04-01), Risucci

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