Envelopes – wrappers – and paperboard boxes – Paperboard box – With closure for an access opening
Patent
1994-01-10
1995-08-22
Shoap, Allan N.
Envelopes, wrappers, and paperboard boxes
Paperboard box
With closure for an access opening
22912526, 2291601, B65D 506
Patent
active
054432022
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a carton box of the pivot lid type, typically a pastille box, having an open narrow end covered by a lid member, which is outwardly or upwardly pivotal about a hinge line at the rear side of the box, while at its three other sides it has depending lid skirt portions which, in the closed position of the lid, project inwardly or downwardly over the mouthing area of the box. For simplicity the boxes will here be described as being oriented with their mouthing turned upwardly, while they will of course be usable with other orientations.
With this kind of boxes it is a traditional problem how to make sure that the lid in its closed position is suitably locked to the box, as a free pivotability of the lid is not desirable. For avoiding unintended openings of the box it is required to operate with a sort of snap locking of the closed lid, such that a certain opening force should be exerted on the lid for opening it. Such a snap locking has already been proposed established in different manners, though each with associated drawbacks with respect to either production or use. The boxes are mass production objects, for which it is decisive that the production costs be held very low, while for the practical use it is just as important that the said locking action will appear not only by the first opening of the box or a few openings thereafter, but rather by many following openings and closings.
For the boxes known so far it has been a problem that either they have been too expensive to produce or their integrated locking portions such as projecting carton flaps has become deformed rather soon, that is after only few openings and closings, in a manner such that they loose their snap locking effect after few operations.
It is the purpose of the present invention to provide a box which is easy to produce in a manner such that the integrated snap locking parts will remain effective through the entire operative lifetime of the box, i.e. through many successive openings and closings of the box.
The invention is based on the recognition that a projecting locking nose portion should not necessarily be a projecting, flexible flap of the material, as it may well be a more spatially designed part, which may exhibit a higher stability against being bent at all.
To be more specific, in connection with the invention it has been observed that on a carton portion a slightly projecting portion can be provided by folding back an outer flap area of the material and fixing to the underlying panel only the outer side areas of the folded flap, while the intermediate part of the flap is left unfixed to the said panel. This bent over middle portion of the flap will thus be free to remain obliquely outstanding from the panel, by the resiliency of the material, provided it gets the opportunity to do this. It will have such an opportunity if, for example, it is formed between two incisions reaching inwardly to near the folding line, though hereby the middle portion will get the character of a pivotal flap that will not be particularly stable. If, however, this middle flap is designed as an outwardly arched, relatively broad tongue portion, the outer or central end portion may, after the folding, remain pronounced projecting and yet be in a stabilizing connection with the two fixed side areas. This stabilization is effective with respect to both pressing and pulling forces on the projecting edge of the tongue flap, as this flap will be shaped as a section of a cone surface that is secured along the sides, whereby it will effectively resist being pressed flat, while the outer, projecting edge portion appears on an arched surface, from which it cannot possibly be bent further out.
Thus, the outbulging locking portion or locking edge will constitute a three dimensional stabilized locking element which may maintain a good locking effect by many consecutive openings and closings of the box, when suitably placed thereon.
Projecting locking flaps, when used, are most commonly provided adjacent the sides of the pivot li
REFERENCES:
patent: 2226477 (1940-12-01), Moore
patent: 3326447 (1967-06-01), Williamson
patent: 3642193 (1972-02-01), Rada
patent: 3756501 (1973-09-01), Skillen et al.
patent: 3942712 (1976-03-01), Bundy et al.
patent: 4948038 (1990-08-01), Moeller
patent: 4964561 (1990-10-01), Whelan
Jorgensen-Beck Frode
Lambach Heinrich W.
McDonald Christopher T.
Schur Engineering A/S
Shoap Allan N.
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