Envelopes – wrappers – and paperboard boxes – Paperboard box – A sidewall includes a folded lateral extension of an...
Patent
1994-03-16
1995-09-26
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
A sidewall includes a folded lateral extension of an...
229918, B65D 520, B65D 542
Patent
active
054528488
ABSTRACT:
A stackable container formed from a sheet of material that is die-cut, for example, and folded to form an open box having a bottom, side walls, and end walls having extensions. Crests formed on the upper edges of the end walls and the extensions provide double-thickness crests when the extensions are folded back onto the inside of the end walls. The double-thickness crests fit into corresponding holes made in the lower edges of the end walls of the open box, such that another similar box can be set securely on the upper edges of the box. Thus, a plurality of boxes can be superimposed, fitting one on top of another, to form stable stacks. The extensions are divided vertically into a first section, a central section and a final section. The extensions are folded inside the box to form prism-shaped reinforcements, the central sections being folded at an oblique angle across the corners of the box. In addition, flaps in the end walls between the final sections fold toward the bottom from the upper edges to form a double thickness with the end walls. Preferably, the side walls of the box are shorter than the end walls to allow ventilation through the box when the boxes are stacked.
REFERENCES:
patent: 3883067 (1975-05-01), McGlynn et al.
patent: 3940053 (1976-02-01), Putman et al.
patent: 4373659 (1983-02-01), Cornell et al.
patent: 4883221 (1989-11-01), Brundage
patent: 5000377 (1991-03-01), McClure
patent: 5002224 (1991-03-01), Muise
Elkins Gary E.
Iberoamericana Del Embalaje S.A.
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