Envelopes – wrappers – and paperboard boxes – Paperboard box – A sidewall includes a horizontally or downwardly extending...
Reexamination Certificate
2000-08-09
2001-10-02
Mancene, Gene (Department: 3727)
Envelopes, wrappers, and paperboard boxes
Paperboard box
A sidewall includes a horizontally or downwardly extending...
C229S191000, C229S918000, C229S174000
Reexamination Certificate
active
06296178
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to corrugated paperboard containers, and more particularly, to single-piece container blanks capable of forming triangular reinforcing columns within the container's interior as assembled.
BACKGROUND OF THE INVENTION
Containers used to package perishable items, such as fruits and vegetables, must meet a variety of requirements. One important requirement is that the container be strong enough to contain the product from the time it is packed until the time it is unpacked. It is also important that the container have sufficient stacking strength so that several containers may be stacked vertically during shipment. Another desirable feature for efficient transportation is to have stacking tabs protruding from one container and insertable into an opening of adjacent container to prevent sway and possible destacking. See for example, U.S. Pat. No. 3,940,053.
One known method of gaining additional container strength is to use some type of triangular corner post within the container. See for example, U.S. Pat. No. 5,535,941. Typically, such arrangements have complicated blanks, are difficult to form, or require excessive gluing in order to maintain their shape. These can all be significant disadvantages for container makers, since additional effort is needed to cut and create the finished boxes, thereby adding to their production cost.
SUMMARY OF THE INVENTION
The present invention is directed to providing a single-piece containerboard blank from which a box is easily formed and maintained. The present invention includes an arrangement in which the various box panels naturally correspond to keep their relative positions, thus ensuring good container strength throughout the container's use. The present invention may be made with various stacking tabs to improve its stack-ability, as well.
In accordance with aspects of the present invention, a single-piece containerboard blank is provided having hingedly connected first and second side walls in which the second side wall is smaller in length than the first side wall. The second side walls include outer abutment edges. The first side walls include first and second interior end walls. Each second interior end wall includes a hypotenuse panel with an inwardly-oriented edge. As assembled, the blank forms a container having opposed multi-ply side panels, opposed end panels, and a bottom panel. The hypotenuse panels are oriented in an upright manner and ultimately positioned so that their inwardly-oriented edges push against the first side wall, and in one embodiment, further push directly against the abutment edges of the second side wall.
In accordance with other aspects of the invention, tabs and mating openings are provided to help stabilize the container when multiple containers are placed in a stack. In another embodiment, top closure panels are provided to close off the upper portions of the container. The top closure panels may each include a notch that mates with an upright tab as assembled.
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Christensen O'Connor Johnson & Kindness PLLC
Mai Tri M.
Mancene Gene
Weyerhaeuser Company
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