Envelopes – wrappers – and paperboard boxes – Paperboard box – Having means to facilitate opening the box by severing box...
Patent
1992-01-22
1993-04-20
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
Having means to facilitate opening the box by severing box...
206273, 2291601, B65D 566
Patent
active
052034950
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to cardboard packets of the hinged lid type, for example a box, which is particularly useful as a sales and pocket packing for pastils, and which has, at an open end, a hood or cap shaped lid comprising a lid panel hinged to one mouth wall portion of the box and skirt flaps projecting from the free edges of the lid panel over the three other mouth wall portions. The skirt flaps comprise a front flap and two opposed side flaps, and since these lid parts are interconnected, they will form a rigid caplike structure, which as a whole is hinged to one edge of the box opening.
Boxes of this type are easy to open, for example, with one finger, and they are well suited for pastils when the lid panel is directly hinged to an edge of the box opening, because the lid panel, when swung out through 90.degree., will form a straight extension of the box side to which it is hinged; when the box is held such that this side is the lowermost side, the opened lid will form a serving tray, onto which the pastils can be shaken out from the box, and from which even the last pastil can easily be picked up. On the other hand it is a serious problem when the lid is too easily opened, because the box may be intentionally opened.
Modified boxes are known; the so-called neck-boxes are particularly used for cigarettes, in which the lid panel is not directly to the rear box side, but hinged thereto through a short extension of that rear side, whereby the hinge axis is spaced from the rear corner of the lid panel. With this design, there will be a certain resistance against the lid structure being both opened and closed, because the front skirt of the lid will be forced be resiliently forced against the mouth edge of the box opposite to the hinge joint when the lid passes through its half-open position. This is a rather effective measure for a fully uncontrolled opening of the lid, but for pastil boxes, it is inconvenient because the open lid will serve as a serving tray, but merely a serving bowl, from which it is difficult to pick up the pastils at the bottom.
In the connection, with the packets of the last mentioned type, it has been attempted to provide for a better locking of the closed lid by means of laterally projecting tabs on the front mouth side of the box; these tabs may frictionally engage the inside of the side skirts of the lid, but this measure does not particularly improve the locking effect which has already been obtained by the neck design itself. The projecting tabs tend to deform the side skirts of the lid or to be deformed themselves, such that the frictional engagement is not too pronounced anyway. Examples of boxes of this type are disclosed in U.S. Pat. No. 3,874,581 and DE-OS 25 27 540.
SUMMARY OF THE INVENTION
Against this background the primary purpose of the present invention is to provide a box of the type referred to above, which is designed such that the hinged lid structure is effectively locked preventing unintentional opening.
According to the invention, this is achieved by using the proposed laterally projecting tabs on the front wall of the box opening not only for frictionally engaging the insides of the side skirts of the lid structure, but for cooperation with the snap locking notches at these insides. The notches are provided between the opposed corner areas of the front skirt portion of the lid and respective edges of cardboard material fastened to the inside of the side skirt portions. In practice, the arrangement may be very simple, because it is natural to cover the inner sides of the lid side skirts by flap portions folded out from the lid panel itself; then some of the material of these flap portions is cut away next to the inside of the front skirt portion in order to provide for notches to cooperate with the laterally projecting tabs.
The tabs, when normally received in the notches, will not be deformed or cause the side skirts to be deformed, and the locking action will not be dependent upon frictional engagement. The locking a
REFERENCES:
patent: 2963214 (1960-12-01), Leone et al.
patent: 3708108 (1973-01-01), Rosenburg, Jr.
patent: 4732276 (1988-03-01), Knecht
Jorgensen-Beck Frode
Lambach Heinrich W.
Elkins Gary E.
Schur Engineering A/S
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