Antibuckling clamshell package

Details Antibuckling clamshell package Antibuckling clamshell package

1993-12-21

1995-02-14

Elkins, Gary E.

Envelopes, wrappers, and paperboard boxes

Paperboard box

With closure for an access opening

229114, 229920, 229930, B65D 566

Patent

active

053887581

ABSTRACT:
A clamshell type container formed of a unitary blank of paperboard. The rear wall of the container includes a hinge line to permit opening and closing of the top cover. Buckling sometimes occurs at this hinge line upon cover opening. According to this invention four curved cut lines are provided in the common rear wall having the hinge line. The ends of these cut lines are pairwise contiguous and are spaced only slightly apart. The four pairs of contiguous cut line ends form the corners of an imaginary rectangle. Two opposite corners of the rectangle lie on the hinge line, while the remaining two opposite corners lie laterally of the hinge line on respective opposite sides thereof.

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patent: 5205476 (1993-04-01), Sorenson
patent: 5221040 (1993-06-01), Sorenson

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