Self-locking corner structure

Envelopes – wrappers – and paperboard boxes – Paperboard box – A sidewall includes a horizontally or downwardly extending...

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Details

229190, B65D 522

Patent

active

048443310

ABSTRACT:
A self-locking corner structure for trays, cartons, lids, or the like has a generally plainer main panel and first and second side panels foldable along fold lines relative to the main panel to positions normal to each other and to the main panel to form a corner structure. One of the side panels has a flap portion at one end thereof foldable along a fold line to a position parallel and with one of its side surfaces adjacent to the other side panel, the flap portion having a sloping edge. The other of the side panels has a tab portion foldable along a sloping fold line generally parallel and adjacent to said sloping edge with the side panels positioned normal to the main panel and normal to each other and with the flap folded to a position parallel to the other side panel. The tab portion is foldable along the sloping fold line over the sloping edge, and downwardly adjacent the other side surface of the flap, and is held in said folded position to lock the side panels in position normal to each other and the main panel.

REFERENCES:
patent: 3335935 (1967-08-01), McCallum
patent: 3616989 (1971-11-01), Martinek et al.
patent: 4128167 (1978-12-01), Hogshead, III
patent: 4133430 (1979-01-01), Cravens
patent: 4305543 (1981-12-01), Lai
Drawings I and II submitted by applicant as prior art on 12-19-88.

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