Envelopes – wrappers – and paperboard boxes – Paperboard box – Variable volume
Reexamination Certificate
2000-08-09
2004-01-13
Mai, Tri M. (Department: 3727)
Envelopes, wrappers, and paperboard boxes
Paperboard box
Variable volume
C229S101100, C229S101200, C229S237000
Reexamination Certificate
active
06676009
ABSTRACT:
FIELD OF THE INVENTION
This invention most generally relates to containers. More particularly the invention relates to containers which may be folded in a manner so as to create a selected volume for the container. Most particularly, the invention relates to mailing or shipping containers made of cardboard, corrugated cardboard, boxboard or the like, which are foldably adjustable with respect to a height dimension and consequent volume in order to accommodate articles or collections of articles having a specific volume. The variable volume container thus eliminates the need for post offices and other mailing and shipping businesses to have to purchase and stock a great variety of sizes of boxes and containers. Storage of variable volume boxes is more efficient, and consumers purchasing boxes for shipping do not have to worry about or guess what size box is appropriate for their packages.
DESCRIPTION OF THE PRIOR ART
Various folding box designs which are foldable from a one-piece blank are known in the art. In this regard, a typical foldable box blank has primary folding lines which may be perforations, indentations, slits, scoring, cuts or any other weakening lines which-provide weakening of the integrity of the unfolded box blank so that the box may be formed by folding at the weakening lines. Such foldable box blanks are usually cut or stamped from a flat sheet of, for example, cardboard. The die used to stamp the blank also scores the blank along selected lines, to enable a person to easily fold the blank along such scores to create the finished container. Some examples of known foldable containers include a typical pizza box, milk carton, and a box used to ship books.
The primary disadvantage with most of the types of boxes discussed above, especially for those in the mailing and shipping fields, is that the box blank can form a box of only one size. Therefore, finished boxes have a fixed and predetermined volume. If a person buys a box, and it is not the right size for the item being shipped, another box must be acquired or the box must be cut down with a sharp instrument such as a knife. Companies that are in the business of packaging goods and mailing and shipping of goods must stock and carry many differently sized boxes or box blanks. In addition, if a box is too big for an item and sufficient packing is not included when the item is packed, there is increased risk of damage to the item or injury to a person carrying the box or container. In particular, the item which is loose in the box may quickly shift if the box is tilted, thus possibly causing damage to the item by hitting the sides of the container, or causing damage to the item or person carrying it when the box is accidentally dropped due to the sudden, unexpected shift of weight. Furthermore, if a force is applied near the top center of a partially filled box, the tape that secures the box can be forced loose.
As a result, various boxes have been designed to be able to form finished boxes having various selectable volumes, thus reducing manufacturing and storage costs, reducing inconvenience for customers attempting to select a container of proper size, and reducing damage to persons and property due to items being placed in inappropriately sized containers. For instance, a book-shipping box known to Applicant comprises a flat rectangular bottom portion with four extending flaps which are each scored along the edge of the bottom portion and at two or three distances out from the flat bottom portion. The scoring enables the flaps to be folded up to different heights to accommodate books of different thicknesses but the corners of the formed boxes remain uncovered. Other examples of boxes having various selectable volumes include U.S. Pat. No. 2,382,891 to McCormick, U.S. Pat. No. 3,302,855 to Becker, U.S. Pat. No. 3,313,467 to Anderskow, and German patent document No. 24 37 862.
In particular, U.S. Pat. No. 2,382,891 to McCormick discloses a box with extending flaps which can be used to close the box. The reference also discloses a plurality of horizontal creases on the side walls of the box and corner creases in the form of a cut-score or perforation is provided at the corners of the box where the side walls are joined. The perforation allows the corner of the side walls to be separated and the side walls to be folded along the horizontal creases to thereby provide a box having various selectable volumes.
Despite the advantages provided by a box having various selectable volumes, actually changing the volumes on such boxes has been found to be very difficult. In particular, the perforations which join the side walls must be separated to adjust the volume of the box. However, in order to do so, the user must grasp the large side panels and tear them apart in opposite directions with respect to one another while at the same time, overcoming the force exerted by the box and the side walls thereof to resist being temporarily deformed which is necessary to separate the side walls. As can be appreciated, such motion is very difficult to control and often results in over tearing the corner perforation thereby weakening the box or rendering it useless. As a result, none of the above noted prior art boxes having various selectable volumes have gained in popularity in the market place despite being known in the art. Therefore, there still exists an unfulfilled need for a container having various selectable volumes where the volume of the container can be easily changed.
SUMMARY OF THE INVENTION
The invention is directed primarily to a container having a plurality of selectable volumes which selectable volumes are made by inwardly folding sides and ends of the container along selectable foldable creases. The invention may also be a container in unassembled form comprised of a flat blank sheet of material foldable to form walls and bottom and scribed or scored before or after assembly into the container, to provide for the selectable creasing and folding. The container may have any suitable use and particularly may be a shipping container or a storage container. Preferably the container, when assembled, is rectangular in cross sectional shape, and may be formed from cardboard, corrugated cardboard, or other suitably strong but creasable and foldable material. The container may be assembleable from a substantially flat form.
In accordance with one embodiment of the present invention, the above objects are obtained by a container having a plurality of selectable volumes including a plurality of fold facilitating creases adapted to allow panels to be folded or removed along a fold facilitating crease and/or perforation, further including a first set and a second set of perforations extending substantially parallel to a corner edge to thereby define a removable strip for unconnecting panels that form a corner edge from one another. In one embodiment, the container may have a rectangular shape while in another embodiment, the container may have a triangular, or other polygonal shape. The first set of perforations and the second set of perforations are positioned at a spaced distance from each other. The first set of perforations is provided on a first panel while the second set of perforations is provided on either the corner edge itself or a second panel that form the corner edge. The container may further include lateral perforations extending laterally between the first set of perforations and the second set of perforations as well as slots along a top edge of the panels.
In accordance with the preferred embodiment of the present invention, the above objects are obtained by a rectangular container having a plurality of selectable volumes including a bottom portion having a substantially rectangular shape with two substantially parallel side edges and two substantially parallel end edges, two side panels attached to and extending upwardly from the two side edges of the bottom portion, and two end panels attached to and extending upwardly from the two end edges of the bottom portion, each of the two side panels having edges
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