ES1057645U - Closing device for cartons. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Closing device for cardboard boxes, especially for rectangular-prismatic boxes equipped at the level of their flap opening prolongation of their side walls, which are sequentially attached on said mouth, first the smaller flaps and then the larger flaps, each of the latter affecting the middle of the mouth of the box, characterized in that it consists of a blanking of general "U" configuration, established in a centered arrangement on each of the smaller closing flaps of the box, die-cut. Side branches extend towards the smaller side walls of the box, and whose middle branch is provided with a pronounced intermediate inflection determining two lateral and symmetrical tabs intended to be inserted in slots operatively practiced in each of the ends of the larger flaps, so that said tabs act as blocking elements for the larger flaps in s closing situation for the box. (Machine-translation by Google Translate, not legally binding)

Description

Closing device for cardboard boxes.

Object of the invention

The present invention relates to a device closure that has been specially designed for cardboard boxes, specifically for prismatic-rectangular boxes that, with any permanent closure system at the base level lower, incorporates four flaps on its upper base, of which two of them fall down first, and the other two do it over the previous ones.

The object of the invention focuses on the means that stabilize said upper flaps in a situation of closure, allowing a quick and efficient fixation in the absence of means outside the own material constituting the box.

Background of the invention

Within the wide range of solutions structural structures for cardboard boxes, one of them is the one in which the box is obtained by a body single piece, duly stamped, that closes on itself adopting a tubular and prismatic configuration, for example by means of a marginal tab, topping off said tubular body in fins properly configured to determine among them a tongue and groove and stable coupling and that in turn it extends superiorly in four flaps, as an extension of its four lateral faces, so that the two more fins small ones fall down first on the mouth of the body, and finally the other two do, which are what determine the final closure, constituting each one of them one half of the definitive upper base of the body of the box.

For the definitive fixation of those mentioned flaps, that is to say to get the closure of the box, are used usually two solutions, one in which adhesives are used appropriate and another in which staples are used.

Either of these two solutions presents a problematic with a double aspect:

On the one hand, it requires means other than own material constituting the box to stabilize the closure, which complicates and makes said closure more expensive.

On the other hand, once the opening of the box, either by eliminating said staples or by separating the adhesive areas, the box can no longer Recover the closing position.

Description of the invention

The closing device for cardboard boxes that the invention proposes resolves in a fully satisfactory manner the problematic previously exposed, in the different aspects commented.

To do this and more specifically, from a basic and conventional structuring as before described, said closing device is embodied in the establishment, on each of the minor flaps corresponding to the mouth of the box, of a die cut basically "U" configuration, which extends substantially towards the minor side walls of the body, with the purpose that will be seen later, presenting said die cut its middle branch facing the free edge of the corresponding flap, substantially distanced from said edge and with a determining intermediate inflection of two lateral tabs basically rectangular, destined to interlock in paths slots operatively established at the ends of each of the major flaps.

Between the side branches of that die cut in "U" three transverse folding lines are established, one located on its free ends, and consequently located on the lower side wall of the body, another in sensitive alignment with the folding line that relates said minor side wall with the own flap, and the third, discontinuous, which is set at the level of the beginning of the mentioned tabs.

According to this structuring in the first closing maneuver, the dejection of the minor flaps, the stamped sectors of them do not follow the rest of the flaps in said dejection, remaining outside the mouth of the box, and after the folding of the major flaps, we proceed to the dejection in turn of said stamped sectors, introducing the tabs through the grooves of the flaps, of such tabs act as fixing means for the major flaps, which immobilize them in a closed situation.

In order to enhance the stability of the set in such a closing situation, it is planned that each of the tongues mentioned present a slight widening in their area initial, in turn slightly oversized with respect to the length of the complementary grooves, so that it is required of a slight overexertion so that the tabs penetrate the grooves, being finally perfectly stabilized in the breast of the latter.

In this way a closure is achieved in which no any element outside the cardboard body itself participates constitutive of the box, closure that is easily practicable both in the sense of closure itself and in the sense of subsequent opening, without the closing device being damaged in these operations and, consequently, may be Reused as many times as necessary.

Description of the drawings

To complement the description that is being performing and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical realization of it, is accompanied as part member of that description, a set of drawings where with illustrative and non-limiting nature, what has been represented next:

Figure 1.- Shows a perspective view of a cardboard box provided with the closing device that constitutes the object of the present invention.

Figure 2.- Shows a development in plant of the box in the previous figure.

Preferred Embodiment of the Invention

In view of the figures outlined you can Observe how the device proposed by the invention is applicable to a cardboard box based on a laminar body and monopieza (1), in which a plurality of lines of decisive cutting and folding of the four lateral faces (2-2'-3-3 ') of the box, topped one of them in a tab (4) that allows the closure of the body on itself, by adhesive, extending the side walls cited by its lower extremity in fins (5-5'-6-6 '), which in the practical implementation chosen are intended to be interconnected tongue and groove setting the bottom of the box, but that they can adopt any other configuration, while superiorly said side walls extend in flaps (7-7'-8-8 ') folding on the mouth of the body to effect closure on it, being able to the minor side walls (3-3 ') be equipped with windows or holes (9) in handle functions

Well, according to the invention, the closing device is embodied in a die cut (10), of general "U" configuration, centered on each of the minor closing flaps (8-8 '), whose branches lateral extend to the lateral and minor walls (3-3 ') of the box, as seen in any of the figures, and whose middle branch has a sharp inflection intermediate (11) determining two tabs (12) that adopt a symmetrical arrangement with respect to the imaginary major axis of the box in closing situation of the same.

The sector defined by said die cut (10) is affected by three transverse folding lines, a first folding line (13) that corresponds to the free ends of the side branches of the die cut (10), and consequently on the side wall itself (3-3 ') corresponding to the box, a second folding line (14) that is substantially extended with the folding line that relates the minor side wall (3-3 ') with the flap (8-8') corresponding, and a third fold line (15) interrupted at the bottom of the inflection itself (11) and at the level of the latter, so that each stamped sector is capable of folding such as shown in figure 1.

Complementarily the major flaps (7-7 ') present near their respective ends grooves (16), formally, dimensionally and positionally suitable for receive the tabs (12) in armed situation.

In this way and as already said with previously, the minor flaps (8-8 ') are folding on the mouth of the box, keeping the sectors  defined by the die cuts (10) folded out, so that do not interfere with the subsequent dejection of the flaps older (7-7 '), after which we proceed to depletion of said sectors defined by die cuts (10) with insertion of the tabs (12) into the slots (16), said tabs (12) acting as stabilizing means for the flaps (7-7 ') in the aforementioned closing situation of box.

It only remains to point out finally that, in order to positionally stabilize the tabs (12) within the slots (16), it is provided that such tabs incorporate in their Start slight lateral widening (17) than the oversize with respect to the length of the grooves (16), so that some forcing is necessary in the implementation of said tabs (12), which prevents subsequent decoupling accidental of them.

Claims (3)

1. Closing device for cardboard boxes, especially for prismatic-rectangular boxes provided at the level of their mouth with flaps extending their side walls, which are sequentially folded over said mouth, first the minor flaps and then the major flaps , each of the latter affecting half of the mouth of the box, characterized in that it consists of a die-cut of general configuration in "U", established in an arrangement centered on each of the smaller closing flaps of the box, whose die lateral branches extend towards the smaller lateral walls of the box, and whose middle branch is provided with a pronounced intermediate inflection determining two lateral and symmetrical tabs intended to be introduced into paths operatively practiced in each of the ends of the major flaps, so that said tabs act as blocking elements for the larger flaps themselves Closing rate for the box. 2. Closing device for cardboard boxes, according to claim 1, characterized in that the lateral branches of said "U" die are related to each other by means of three folding lines, one that relates its free ends and that is placed on the wall corresponding lower of the body of the box, another substantially alienated with the folding line that relates each minor flap with the corresponding lateral and minor wall of the body, and a third that is located at the level of the bottom of the intermediate inflection determining the tabs, in correspondence with the beginning of the latter, so that such folding lines facilitate the initial and external deformation of the stamped sectors during the demolition of the rest of the minor flaps and the abatement on the latter of the major flaps, and finally facilitate the deformation of said stamped sectors so that the tabs thereof penetrate the grooves of the flaps greater. 3. Closing device for cardboard boxes, according to previous claims, characterized in that said tabs have a slight widening close to their beginning, which oversizes them with respect to the length of the complementary grooves, to establish a forced coupling that prevents decoupling accidental of said tabs.