Envelopes – wrappers – and paperboard boxes – Paperboard box – With closure for an access opening
Patent
1994-04-28
1994-11-22
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
With closure for an access opening
229132, B65D 506
Patent
active
053661427
ABSTRACT:
A rectangular cardboard box made from typically a single cardboard piece comprises a rectangular, tubular body having four walls terminating in end flaps which respectively connect to the walls through fold lines. The end flaps are foldable along the fold lines to close at least one end of the tubular body. The end flaps which are adjacent to each other are separated by a corner and define a first slit extending through the cardboard and along the corner between the flaps from the outer flap ends to a position which is outwardly spaced from the fold lines of the adjacent end flaps, where the first slit terminates. A second slit is defined on the inner surfaces of the adjacent end flaps. The second slit extends outwardly only partially through the thickness of the cardboard piece and defines a line that extends outwardly from the fold line of one adjacent end flap, then extending across the corner between the end flaps, and further extending inwardly to the fold line of the other adjacent end flap. By this means, folding of the adjacent flaps causes a tearing and inward folding of a portion of the cardboard defined by the line at the box corner, to serve as a corner seal.
REFERENCES:
patent: 1723150 (1929-08-01), Gannon et al.
patent: 2516085 (1950-07-01), Williamson
patent: 2523488 (1950-09-01), Williamson
patent: 3261536 (1966-07-01), Bixler
patent: 4088263 (1978-05-01), Michetti
patent: 4915292 (1990-04-01), Ielmini
patent: 5042684 (1991-08-01), West et al.
Elkins Gary E.
Field Container Co. L.P.
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