CONTAINER AND CUTTING FOR THE MANUFACTURING OF A CONTAINER

Description

[0001] The present invention relates to a container for storing goods, in particular a folding box made of cardboard, paper or the like, comprising a front wall and a back wall, side walls connecting the front and back walls, and at least a bottom wall and a lid construction, wherein the lid construction comprises at least an upper lid element hinged to the end of the back wall opposite the bottom wall via a bending line, and a front lid flap at the end of the upper lid element opposite the back wall, as well as side flaps closing the lid construction laterally, and at least one locking tab for locking the lid construction to the front wall in the closed state of the container is hinged to the end of the front wall opposite the bottom wall via a bending line, such that it rests against an outside of the front wall or projects outwards from the container.The invention also relates to a blank for the production of a container for storing goods, in particular for the production of a folding box made of cardboard, paper or the like.

[0002] Containers and blanks for manufacturing containers of the type mentioned above are known in great variety. However, in many areas of daily life, it is necessary that these containers cannot be easily opened. Particularly when storing fragile goods or items such as medications, it is essential to secure the containers against unintentional opening. This applies especially to unintentional opening by children. Such containers are known, for example, from DE 94 03 624 U1 and IT MI20 110 947 A1. A disadvantage of these known containers, however, is that they can be very easily deformed by applying pressure in the area of ​​the locking tabs, and thus in the area of ​​the opening and closing mechanism. Frequent opening and closing of the container can therefore lead to irreversible deformation, which can result in the destruction of the opening and closing function.From EP 0 894 737 A1, a container with the features of the preamble of claim 1 is also known. DE 298 09 572 A1 discloses a container and a blank for manufacturing the container, wherein the container has a lid with a folded-back lid reinforcement. Document GB 1 238 176 A discloses a further container wherein the lid has a folded-back lid reinforcement.

[0003] It is therefore an object of the present invention to provide a container for storing goods and a corresponding blank for manufacturing this container, which can be securely closed, is secured against unintentional opening and ensures safe opening and closing even with frequent use.

[0004] To solve these problems, a container with the features of claim 1 and a blank with the features of claim 11 are used. Advantageous embodiments of the container and the blank according to the invention are described in the respective dependent claims. Advantageous embodiments of the container are to be regarded as advantageous embodiments of the blank and vice versa.

[0005] A first aspect of the invention relates to a container for storing goods, in particular a folding box made of cardboard, paper or the like, comprising a front wall and a back wall, side walls connecting the front and back walls, and at least a bottom wall and a lid construction, wherein the lid construction comprises at least an upper lid element hinged to the end of the back wall opposite the bottom wall via a bending line, and a front lid flap at the end of the upper lid element opposite the back wall, as well as side flaps closing the lid construction laterally, and at least one locking tab for locking the lid construction to the front wall in the closed state of the container is hinged to the end of the front wall opposite the bottom wall via a bending line, such that it rests against an outside of the front wall or projects outwards from the container.At least one inner flap is hinged to the end of the front lid flap opposite the upper lid element, such that the inner flap at least partially abuts and / or is connected to an inner surface of the front lid flap, and at least one first reinforcing element is hinged to the inner flap, such that the first reinforcing element at least partially abuts and / or is connected to an inner surface of the upper lid element. In particular, the first reinforcing element can be at least partially bonded to the inner surface of the upper lid element. The inventive design ensures, on the one hand, a secure and automatic closure of the container by means of the locking tabs. The locking tabs engage, in particular, with an inner surface of the lid assembly, thus automatically securing the lid assembly against unintentional opening, i.e., without any further measures being necessary.To open the container, the locking tabs must be released from their engagement with the lid assembly. This can be achieved, for example, by applying pressure to the front wall of the container or the front wall of the lid assembly. The inner tab and the first reinforcing element attached to it significantly strengthen the lid assembly, preventing irreversible deformation in the area of ​​the locking tabs, even after repeated opening and closing. The term "bend line" encompasses all lines that allow elements of the container or the blank to be bent relative to each other along a defined path. In addition to the aforementioned bend lines, folding, perforation, or creasing lines, or a combination thereof, can also be used.Furthermore, it is possible to use combinations of these lines with cutting lines.

[0006] Furthermore, at least one second reinforcing element is hinged to the end of the first reinforcing element opposite the inner flap, such that it at least partially abuts and / or is connected to an inner surface of the first reinforcing element. This advantageously results in further reinforcement of this area of ​​the container or the lid construction. In particular, the second reinforcing element can be at least partially bonded to the first reinforcing element.

[0007] In further advantageous embodiments of the container according to the invention, at least one recess for receiving the locking tab and at least one pressure tab are formed on an inner side of the lid assembly. When the container is closed, applying pressure to the pressure tab towards the interior of the container releases the locking tab from its engagement with the recess. The corresponding design of the pressure tabs ensures easy opening of the lid assembly or the container. When pressure is applied, the pressure tabs contact the locking tabs and release them from engagement with the aforementioned recess. The pressure tab can also be designed as a pressure field, a simple opening, or a haptic touch panel.An additional safeguard against unintentional opening of the container is achieved by the fact that, when multiple, especially two, locking tabs and corresponding pressure tabs are used, the container can no longer be opened with one hand. Two hands must always be used to open the container, thus providing additional security against unintentional opening of the container or the lid assembly. The recess for receiving the locking tab can be formed entirely within the inner tab or within the inner tab and the first reinforcing element. The pressure tab can be formed within the front lid tab. Furthermore, at least two recesses for receiving the locking tabs can be formed on the inside of the lid assembly. These recesses can be connected by a connecting section to form a continuous recess.Overall, this results in a very stable and load-bearing design of the lid construction.

[0008] In further advantageous embodiments of the container according to the invention, the locking tab can be designed as an element of an intermediate tab hinged to the front wall of the container via a corresponding bending line. Because the locking tab is designed as an element of the intermediate tab, simple and cost-effective manufacturing of the container is also possible. The intermediate tab can, in particular, also serve as a partial cover for the interior of the container or as an intermediate floor within the interior of the container.

[0009] In advantageous embodiments of the container according to the invention, the outline of the locking tab is defined by a cut or perforation line formed in the intermediate tab and the bend line connecting the ends of the cut or perforation line, which is formed between the front wall and the intermediate tab. The outline of the locking tab can also be defined by a cut or perforation line formed in the intermediate tab and the front wall. Furthermore, the cut or perforation line can be surrounded by another cut or perforation line to form a gap between the cut or perforation line and the intermediate tab. This gap allows for a high degree of mobility of the locking tab. This is particularly important because the locking tab should either rest against the outside of the front wall or protrude outwards from the container.

[0010] In further advantageous embodiments of the container according to the invention, at least one further, third reinforcing element is hinged to the end of the intermediate flap opposite the front wall, such that the third reinforcing element at least partially abuts and / or is connected to an inner surface of the intermediate flap. In particular, the third reinforcing element can be at least partially bonded to the intermediate flap over its entire surface. At least one engagement recess or opening can be formed at the end of the intermediate flap opposite the front wall. The intermediate flap, which—as mentioned above—can also serve, in particular, as a partial cover for the interior of the container or as an intermediate floor within the interior of the container, is made more stable and thus more resilient by the third reinforcing element.The possibility of forming an access recess or opening facilitates folding back the intermediate flap and thus releasing the interior of the container.

[0011] Furthermore, the lid construction can be designed such that, when the container is closed, an inner surface of the upper lid element, which forms the end of the lid construction, rests at least partially on an end of the side walls and / or the front wall opposite the base construction. This also serves to securely close the container, and in particular ensures that, for example, free-flowing goods can be safely stored inside the container.

[0012] A second aspect of the present invention relates to a blank for manufacturing a container for storing goods, in particular for manufacturing a folding box made of cardboard, paper, or the like. The blank comprises a front wall, a back wall, and corresponding side walls, as well as at least one bottom wall and a lid assembly. The lid assembly comprises at least one upper lid element hinged to the end of the back wall opposite the bottom wall via a bending line, and a front lid flap hinged to the end of the upper lid element opposite the back wall via a bending line. Furthermore, side flaps that close the lid assembly when the container is folded are hinged to the upper lid element via bending lines. In addition, at least one locking tab is hinged to the end of the front wall opposite the bottom wall via a bending line.According to the invention, at least one inner flap is hinged to the end of the front lid flap opposite the upper lid element, and at least one first reinforcing element is hinged to the end of the inner flap opposite the front lid flap. The inventive design ensures, on the one hand, that the resulting container can be securely and automatically closed, is protected against unintentional opening, and is robust. According to the invention, the design can be formed in one piece.

[0013] Furthermore, at least one second reinforcing element is arranged at the end of the first reinforcing element opposite the inner flap. This advantageously results in further reinforcement of this area of ​​the container or lid construction produced by the inventive cutting method.

[0014] In further advantageous embodiments of the blank according to the invention, at least one pressure tab can be formed in the front cover flap, wherein at least one recess for receiving the locking tab is formed in the inner flap when the blank is folded. The pressure tab serves to easily open the locking tab or to release the locking tab from the aforementioned recess. Furthermore, the recess for receiving the locking tab can be formed entirely in the inner flap or in the inner flap and the first reinforcing element. It is also possible that the recess for receiving the locking tab is formed entirely in the inner flap or in the inner flap and the first reinforcing element, with the locking tab being formed as an element of an intermediate flap hinged to the front wall via the bending line.

[0015] In a further advantageous embodiment of the inventive design, at least one third reinforcing element can be hinged to the end of the intermediate flap opposite the front wall via a bending line. Furthermore, at least one engagement recess or opening can be formed at the end of the intermediate flap opposite the front wall. The third reinforcing element allows for a stable design and thus improved load-bearing capacity of the intermediate flap in the folded state.

[0016] In further advantageous embodiments of the inventive blank, the outline of the locking tab is defined by a cut or perforation line formed in the intermediate tab and the bend line connecting the ends of the cut or perforation line. It is also possible, however, for the outline of the locking tab to be defined by a cut or perforation line formed in the intermediate tab and the bend line connecting the ends of the cut or perforation line, with the cut or perforation line being surrounded by a further cut or perforation line to form a gap between the cut or perforation line and the intermediate tab. This ensures, on the one hand, the simple and cost-effective production of the locking tab and, on the other hand, the mobility of the locking tab through the design of the aforementioned gap.

[0017] Further advantages and embodiments of the design according to the second aspect of the invention can be found in the description of the first aspect of the invention.

[0018] Further features of the invention will become apparent from the claims, the exemplary embodiments, and the drawings. The features and combinations of features mentioned above in the description, as well as those subsequently mentioned in the exemplary embodiments, can be used not only in the combinations specified but also in other combinations without departing from the scope of the invention as defined by the accompanying claims. The drawings show... Figure 1 is a schematic side view of a container according to the invention in a closed state; Figure 2 is a schematic side view of the container according to Figure 1a in an open state; and Figure 3 is a schematic representation of a blank according to the invention.

[0019] The Figure 1 Figure 1 shows a schematic side view of a container 10 in its closed state. Figure 2 shows container 10 in the open state. Fig. 1 and 2 are described together below, where identical reference symbols in the figures denote identical features of container 10.

[0020] The one in the Fig. 1 and 2The container 10 shown is used for storing goods. It is a folding box made of cardboard. The container 10 comprises a front wall 12 and a back wall 14, side walls 16 and 18 connecting the front and back walls 12 and 14, a bottom wall 20, and a lid assembly 22. It can be seen that the lid assembly 22 is hinged to the back wall 14 at one end opposite the bottom wall 20 via a bending line 86.

[0021] Furthermore, it becomes clear that two pressure tabs 118, 120 are formed in a front lid flap 36 of the lid assembly 22. The pressure tabs 118, 120 are formed by means of the cutting or perforation lines 122, 124. By applying pressure towards the interior of the container 10 (see arrows shown), corresponding locking tabs 58, 60 can be released from their engagement with recesses 76, 78 formed in the lid assembly 22 (see also Fig. 2 ).

[0022] Furthermore, it can be seen from the figures that the lid assembly 22 has an upper lid element 34 hinged to the end of the rear wall 14 opposite the bottom wall 20 via the bending line 86. The lid assembly 22 also includes the front lid flap 36 formed at the end of the upper lid element 34 opposite the rear wall 14, as well as side flaps 40, 42 that close the lid assembly 22 laterally. The side flaps 40, 42 are connected, in particular bonded, to dust and closure flaps 44, 46 hinged to the front lid flap 36. It can also be seen that an inner flap 38 is hinged to the end of the front lid flap 36 opposite the upper lid element 34, such that it at least partially abuts an inner surface of the front lid flap 36 and is thus connected, in particular bonded, to it.The inner flap 38 has recesses 76, 78 for receiving the locking tabs 58, 60. According to the illustrated embodiment, the recesses 76, 78 are formed in the inner flap 38 and a first reinforcing element 32 and are connected to each other via connecting section 132. In the illustrated embodiment, a rim tab 48 is also formed between the front cover flap 36 and the inner flap 38.

[0023] From the Fig. 1 and 2 The arrangement of the pressure tabs 118, 120 in the area of ​​the recesses 76, 78 also becomes clear. The pressure tabs 118, 120 are arranged such that, when pressure is applied towards the interior of the container 10, they push the locking tabs 58, 60 out of the recesses 76, 78.

[0024] Furthermore, it can be seen that the inner flap 38 is hinged to the end of the front cover flap 36 opposite the upper cover element 34, such that the inner flap 38 abuts and / or is connected to an inner surface of the front cover flap 36. A first reinforcing element 32 is in turn hinged to the inner flap 38, such that the first reinforcing element 32 abuts and / or is connected to an inner surface of the upper cover element 34. In particular, the first reinforcing element 32 is bonded to the inner surface of the upper cover element 34. It can also be seen that a second reinforcing element 70 is hinged to the end of the first reinforcing element 32 opposite the inner flap 38 via a bending line 98, such that it abuts and / or is connected to the first reinforcing element 32. In particular, the second reinforcing element 70 is bonded to the first reinforcing element 32.

[0025] Furthermore, it can be seen that the locking tabs 58, 60 are designed as an element of an intermediate tab 50. The intermediate tab 50 is hinged to the front wall 12 via a bending line 80. The same applies to the locking tabs 58, 60, which are also hinged to the end of the front wall 12 opposite the bottom wall 20 via the bending line 80. It is clear that the locking tabs 58, 60 are designed such that they either rest against the outside of the front wall 12 or project outwards from the container 10. Two lateral gaps 62, 64 are formed between the locking tabs 58, 60 and the intermediate tab 50. When the container 10 is closed, the locking tabs 58, 60 securely engage in the recesses 76, 78 of the lid assembly 22.

[0026] From the Fig. 2It also becomes clear that the intermediate flap 50 serves as an additional cover for the interior of the container 10. It can be seen that a third reinforcing element 52 is hinged to the end of the intermediate flap 50 opposite the front wall 12, such that the third reinforcing element 52 at least partially rests against and / or is connected to an inner surface of the intermediate flap 50. In particular, the third reinforcing element 52 is at least partially bonded to the intermediate flap 50. This significantly increases the overall stability and load-bearing capacity of the intermediate flap 50.

[0027] The lid assembly 22 is designed such that, when the container 10 is closed, an inner surface of the upper lid element 34, which forms the end of the lid assembly 22, rests at least partially on one end of the side walls 16, 18 and / or the front wall 12 opposite the bottom wall 20. This ensures a secure closure of the container 10 by means of the lid assembly 22. Furthermore, it can be seen that the front lid flap 36 is connected to an edge flap 48 via a bend line 92. The edge flap 48 is connected to the inner flap 38 via another bend line 94 running parallel to the bend line 92.

[0028] Fig. 3 shows a schematic representation of a blank 130 for the manufacture of the container 10 according to the one described in the Fig. 1 and 2The embodiment shown illustrates the one-piece construction of the blank 130, which comprises a front wall 12 and a rear wall 14. Furthermore, it can be seen that the blank 130 has a bottom wall 20 and a lid structure 22, the lid structure 22 being hinged to the rear wall 14 via a bending line 86. It is evident that two locking tabs 58, 60 are hinged to the end of the front wall 12 opposite the bottom wall 20 via a bending line 80, the locking tabs 58, 60 being formed as elements of an intermediate tab 50 hinged to the front wall 12 via the bending line 80. The outlines of the locking tabs 58, 60 are defined by a cutting or perforation line 66, 68 formed in the intermediate tab 50 and the bending line 80 connecting the ends of the cutting or perforation line 66, 68.Furthermore, the cutting or perforation lines 66, 68 are each surrounded by another cutting or perforation line 126, thereby forming a gap 62, 64 between the cutting and perforation line 66, 68 and the intermediate flap 50.

[0029] Furthermore, it can be seen that a flat reinforcing element 52 is hinged to the end of the intermediate tab 50 opposite the front wall 12 via a bending line 104.

[0030] The lid assembly 22 comprises an upper lid element 34 hinged to the end of the rear wall 14 opposite the bottom wall 20 via the bending line 86, a front lid flap 36 formed at the end of the upper lid element 34 opposite the rear wall 14, and side flaps 40, 42 that laterally close the lid assembly 22 when the container 10 is folded. The upper lid element 34 is connected to the front lid flap 36 via a bending line 90. The front lid flap 36 is in turn connected to an edge flap 48 via a bending line 92, which runs parallel to the bending line 90. The edge flap 48 is connected to an inner flap 38 via a bending line 94, which runs parallel to the bending line 92. The side flaps 40, 42 are in turn connected to the upper lid element 34 via bending lines 114, 114'.At the end of the inner flap 38 opposite the front cover flap 36, a first reinforcing element 32 is formed, hinged via a bending line 96. It can be seen that at the end of the first reinforcing element 32 opposite the inner flap 38, a further, second reinforcing element 70 is hinged via a bending line 98. Furthermore, it is evident that two recesses 76, 78 are formed in the inner flap 38 for receiving the locking tabs 58, 60 in the folded state of the blank 130. In the illustrated embodiment, the recesses 76, 78 are connected via an intermediate section 132 and form a common recess. The outline of the recesses 76, 78 and the intermediate section 132 is defined by a section line 128, which runs in the inner flap 38 and the first reinforcing element 32.

[0031] The lid assembly 22 also includes two dust and closure flaps 44, 46, which are hinged to opposite ends of the front lid flap 36 via corresponding bending lines 116, 116'. It can be seen that two pressure flaps 118, 120 are formed in the front lid flap 36. The pressure flaps 118, 120 are formed by corresponding cutting or perforation lines 122, 124, which define the outline or shape of the respective pressure flap 118, 120.

[0032] Furthermore, it becomes clear that the rear wall 14 is connected to the side wall 18 via a bending line 112, and the side wall 16 is connected to the rear wall 14 via a bending line 110. Adhesive tabs 24 and 26 are arranged laterally on the bottom wall 20 via corresponding bending lines 106 and 108. It can also be seen that the front wall 12 has laterally arranged adhesive tabs 28 and 30, which are connected to the front wall 12 via corresponding bending lines 100 and 102. In addition, openings 54 and 56 are formed in the front wall 12 in an upper area opposite the bottom wall 20. In the folded state of the blank 130, the openings 54, 56 serve to extend the movement path of the locking tabs 58, 60. The outline of the openings 54, 56 is defined by corresponding cut lines 72, 74 in the front wall 12.

[0033] Furthermore, it can be seen that the intermediate tab 50 is connected to a third reinforcing element 52 via a bending line 104.

[0034] The described container 10, as well as the blank 130 for manufacturing the container 10, are usually made of cardboard, paper, or plastic. Other suitable materials are also conceivable.

Claims

1. A container (10) for storing goods, in particular folding box of cardboard, paper or the like, including a front wall (12) and a rear wall (14), sidewalls (16, 18) connecting the front and rear walls (12, 14) as well as at least one bottom wall (20) and a lid construction (22), wherein the lid construction (22) includes at least one upper lid element (34) hinged to the end of the rear wall (14) opposing the bottom wall (20) via a bend line (86), and a front lid flap (36) at the end of the upper lid element (34) opposing the rear wall (14), as well as lateral flaps (40, 42) laterally closing the lid construction (22), and at least one locking flap (58, 60) for locking the lid construction (22) to the front wall (12) in closed state of the container (10) is hinged to the end of the front wall (12) opposing the bottom wall (12) via a bend line (80), such that it abuts on an outer side of the front wall (12) or outwardly projects from the container (10), characterized in that at least one inner flap (38) is hinged to the end of the front lid flap (36) opposing the upper lid element (34), such that the inner flap (38) at least partially abuts on an inner side of the front lid flap (36) and / or is connected thereto, and at least one first reinforcing element (32) is hinged to the inner flap (38), such that the first reinforcing element (32) at least partially abuts on an inner side of the upper lid element (34) and / or is connected thereto, wherein at least one second reinforcing element (70) is hinged to the end of the first reinforcing element (32) opposing the inner flap (38), such that it at least partially abuts on an inner side of the first reinforcing element (32) and / or is connected thereto.

2. The container according to claim 1, characterized in that at least one recess (76, 78) for receiving the locking flap (58, 60) and at least one pressure flap (118, 120) in the area of the recess (76, 78) are formed on an inner side of the lid construction (22), wherein the locking flap (58, 60) can be brought out of its locking to the recess (76, 78) upon exertion of pressure on the pressure flap (118, 120) towards an interior space of the container (10) in closed state of the container (10).

3. The container according to claim 2, characterized in that the recess (76, 78) for receiving the locking flap (58, 60) is completely formed in the inner flap (38) or the recess (76, 78) is formed in the inner flap (38) and the first reinforcing element (32).

4. The container according to any one of the preceding claims, characterized in that the locking flap (58, 60) is formed as an element of an intermediate flap (50) hinged to the front wall (12) via the bend line (80).

5. The container according to claim 4, characterized in that a contour of the locking flap (58, 60) is defined by a cut or perforation line (66, 68) formed in the intermediate flap (50) and the bend line (80) connecting the ends of the cut or perforation line (66, 68), or a contour of the locking flap (58, 60) is defined by a cut or perforation line (66, 68) formed in the intermediate flap (50) and the front wall (12).

6. The container according to claim 5, characterized in that the cut or perforation line (66, 68) is surrounded by a further cut or perforation line (126) for forming a gap (62, 64) between the cut or perforation line (66, 68) and the intermediate flap (50).

7. The container according to any one of claims 4 to 6, characterized in that at least one third reinforcing element (52) is hinged to the end of the intermediate flap (50) opposing the front wall (12) such that the third reinforcing element (52) at least partially abuts on an inner side of the intermediate flap (50) and / or is connected thereto.

8. The container according to any one of claims 2 to 7, characterized in that the pressure flap (118, 120) is formed in the front lid flap (36).

9. The container according to any one of claims 2 to 8, characterized in that at least two recess (76, 78) for receiving the locking flap (58, 60) are formed on the inner side of the lid construction (22), or that at least two recess (76, 78) for receiving the locking flap (58, 60) are formed on the inner side of the lid construction (22) and the recesses (76, 78) are connected to each other via a connection portion (132) and form a continuous recess.

10. The container according to any one of the preceding claims, characterized in that the lid construction (22) is formed such that an inner side of the upper lid element (34) forming the termination of the lid construction (22) at least partially rests on an end of the sidewalls (16, 18) and / or the front wall (12) opposing the bottom construction (20) in a closed state of the container (10).

11. A blank (128) for producing a container (10) for storing goods, in particular for producing a folding box of cardboard, paper or the like, comprising a front wall (12), a rear wall (14) and sidewalls (16, 18) as well as at least one bottom wall (20) and a lid construction (22), wherein the lid construction (22) includes at least one upper lid element (34) hinged to the end of the rear wall (14) opposing the bottom wall (20) via a bend line (86) and a front lid flap (36) hinged to the end of the upper lid element (34) opposing the rear wall (14) via a bend line (90), wherein lateral flaps (40, 42) closing the lid construction (22) in folded state of the container are additionally hinged to the upper lid element (34) via bend lines (114, 114'), at least one locking flap (58, 60), which is hinged to the end of the front wall (12) opposing the bottom wall (20) via a bend line (80), characterized by at least one inner flap (38) hinged to the end of the front lid flap (36) opposing the upper lid element (34); and at least one first reinforcing element (32) hinged to the end of the inner flap (38) opposing the front lid flap (36); and wherein at least one second reinforcing element (70) is hinged to the end of the first reinforcing element (32) opposing the inner flap (38).

12. The blank according to claim 11, characterized in that at least one pressure flap (118, 120) is formed the front lid flap (36) and at least one recess (76, 78) for receiving the locking flap (58, 60) in folded state of the blank (128) is formed in the inner flap (38).

13. The blank according to claim 12, characterized in that the recess (76, 78) for receiving the locking flap (58, 60) is completely formed in the inner flap (38) or the recess (76, 78) is formed in the inner flap (38) and the first reinforcing element (32); or that the recess (76, 78) for receiving the locking flap (58, 60) is completely formed in the inner flap (38), or the recess (76, 78) is formed in the inner flap (38) and the first reinforcing element (32), and the locking flap (58, 60) is formed as an element of an intermediate flap (50) hinged to the front wall (12) via the bend line (80).