Pre-assembled, foldable cardboard packaging

Abstract

The invention relates to a pre-assembled foldable cardboard package comprising: two first walls (124, 126) and two second walls (128) respectively hinged on said first two walls; a third wall (136) mounted hinged on one (124) of said first two walls so as to be able to come into contact with the other (126) of said first two walls; a fourth wall (50) mounted hinged on said one (124) of said first two walls to form a lid, said fourth wall (50) extending into a first hinged flap (54).The said third wall (136) has a first tab (42) folded to form a first locking shoulder (118), while the said first flap (54) has a second tab (58) forming a second locking shoulder (65); and the said second tab (58) is adapted to be engaged through the said other (126) of the said first two walls so that the said first (118) and second (65) shoulders engage with each other. Figure to be published with the abstract: Fig. 5.

Description

Title of the invention: Pre-assembled, foldable cardboard packaging

[0001] The present invention relates to a pre-assembled, foldable cardboard package adapted to be folded into a volume and then closed to be locked.

[0002] One envisaged field of application is in particular, but not exclusively, that of mail order sales where it is necessary to pack the shipped products quickly and to ensure that the packaging is locked.

[0003] Known packaging, of the "American-style" type, comprises two longitudinal walls held parallel to each other by two parallel transverse walls, each hinged to the two longitudinal walls. Thus, the two longitudinal walls are adapted to be supported perpendicularly to the transverse walls, defining a receiving volume.

[0004] They further comprise a bottom wall mounted hinged to one of the longitudinal walls so as to engage with the opposite longitudinal wall. The other longitudinal wall also comprises another hinged bottom wall, while the two transverse walls comprise two walls cut at an angle and connected respectively to said other bottom wall and to said bottom wall. When the package is folded, the bottom walls and the two walls cut at an angle are folded against each other between the two longitudinal walls and the two transverse walls, which are themselves brought close together, the transverse walls being substantially parallel to the longitudinal walls.When the packaging is unfolded, the transverse walls are brought substantially perpendicular to the side walls and simultaneously, the other bottom wall and the two obliquely cut walls unfold automatically, forming a support for said bottom wall which itself automatically comes into contact with it.

[0005] Furthermore, such packaging includes a lid wall hinged on one of the longitudinal walls opposite the bottom wall so as to also engage with the other longitudinal wall. The lid wall also extends into a hinged locking flap having a self-adhesive strip so as to be applied against the other longitudinal wall and sealed thereto.

[0006] While such packaging can be stored folded easily, then unfolded and quickly put into volume for filling, and then closed for shipping, at relatively high rates, they require the use of adhesives which makes their recycling more complex.

[0007] Also, a problem which arises and which the present invention aims to solve is to provide packaging which allows for the simplification of its recycling.

[0008] In order to solve this problem, and according to a first object, it is proposed a pre-assembled foldable cardboard packaging comprising: two first walls held parallel to each other by two second walls parallel to each other respectively hinged on said first two walls, said first two walls being adapted to be carried perpendicular to said second walls defining a receiving volume; a third wall having two opposite faces and mounted hinged on one of said first two walls so as to be able to come into contact with the other of said first two walls forming a base, one of said two opposite faces extending to the opposite of said receiving volume;a fourth wall mounted hinged on one of the said first two walls opposite the said third wall so as to be able to engage with the other of the said first two walls by forming a lid, the said fourth wall extending by a first hinged flap so as to be able to be applied against the other of the said first two walls. ;

[0009] Also, said third wall has, opposite said one of said first walls, a first tab folded against said one of said two opposite faces to form a first latching shoulder, while said first flap has, opposite said fourth wall, a second tab folded partially back on itself to form a second latching shoulder. And said second tab is adapted to be engaged through said other of said two first walls to come opposite said one of said two faces so that said first and second shoulders engage with each other.

[0010] Thus, a feature of the invention lies in the implementation of a first tab folded against the edge of the third wall, opposite the receiving volume, while the first flap has a second tab partially folded back on itself, so as to be able to engage the second tab through the other of the first two walls, and under the third wall forming a base, in order to make the shoulders of the two tabs cooperate. The two shoulders butt against each other and thus prevent the withdrawal of the second tab. Thus, the first flap is locked against the other of the first two walls.

[0011] Furthermore, it will be observed that the second tab can be freely engaged under the third wall forming a base, without being hindered by the contents of the receiving volume.

[0012] In this way, the packaging is mechanically locked without the need for a self-adhesive film. The entire packaging can then be recycled in a single process.

[0013] Also, the packaging according to the invention advantageously comprises a second flap hinged on said other of said first two walls along a first line of articulation so that it can be applied against one of the two opposite faces. In other words, when the first two walls are unfolded and held perpendicular to the second walls, the third wall can rest against the second flap, which itself is held perpendicular to the other two walls to which it is attached, by means that will be detailed below. In this way, the second tab is engaged between the third wall and the second flap. Also, the second tab is held in contact between the third wall and the second flap, so that the second shoulder cannot escape the support of the first shoulder, as will be explained in more detail later in the description.

[0014] Furthermore, preferably, said other of said first two walls has a slot along said first articulation line to enable said second tongue to engage. Thus, the second tongue is engaged through the slot, and between the third wall and the second flap.

[0015] Furthermore, the packaging according to the invention comprises two third notched flaps, respectively hinged to said second walls and respectively connected laterally to said third wall and said second flap. As will be explained below, the two third flaps are identical, and they have one notched side and an opposite side that folds obliquely. This obliquely foldable side is then glued, for one of the third flaps, to the third wall, and for the other, to the second flap.

[0016] As will be explained in more detail later in the description, such an arrangement allows the three flaps and the third wall, which then rests on them, to be deployed automatically when the first walls and the second walls are carried perpendicular to each other.

[0017] The flaps thus partially interlock under the third wall and thus provide a relatively high mechanical resistance to deformation.

[0018] In addition, the packaging includes two fourth flaps hinged respectively on the second walls opposite the two third flaps. These two fourth flaps cover the products placed in the receiving compartment, thus protecting them. Furthermore, these two fourth flaps also stiffen the packaging when folded down.

[0019] Preferably, the packaging according to the invention comprises a fifth flap hinged to the other of the first two walls opposite the second flap. This fifth flap can then be folded against the two fourth flaps already folded over the products placed in the receiving compartment. In this way, both their protection is increased and the packaging is further reinforced.

[0020] According to a particularly advantageous feature of the invention, said The first tab is glued against one of the two opposite faces. In this way, the first tab remains flush against one of the two opposite faces, along its edge. Consequently, the first shoulder remains erect on this surface, opposite the receiving volume.

[0021] Furthermore, the second tab, partially folded back on itself, is not glued. Indeed, thanks to the resilience of the cardboard, the folded portion remains inclined relative to the rest of the tab, which is advantageous. For when the second tab is drawn through the slot between the third wall, which has the first shoulder, and the second flap, the folded portion comes to rest against the rest of the tab. However, at the end of its travel, when the folded portion extends beyond the first shoulder, it tends to unfold and come to rest against the surface of the third wall, opposite the receiving volume. Consequently, the second shoulder extends opposite the first shoulder, and movement of the second tab in the opposite direction is then prevented, since the two shoulders come to rest against each other.The second tab is thus kept locked inside between the third wall and the second flap.

[0022] Furthermore, said third wall preferably has, opposite said first wall, an anchoring tongue adapted to engage with said other first two walls. The anchoring tongue may engage in return with said slot. Preferably, said other first two walls has a noticeable offset at the anchoring tongue to maintain the third wall transversely in a fixed position.

[0023] According to another aspect, the invention relates to a cardboard blank for producing packaging as described above. It comprises: a longitudinal strip comprising two first panels separated from each other by a first second panel and a second second panel adjoining one of said first panels opposite said first second panel; a third panel adjoining transversely to one of said first panels, on one side of said longitudinal strip; a fourth panel adjoining transversely to said one of said first panels opposite said third panel, said fourth panel having a first extension. And, said third panel has, opposite said one of said first panels, a first projecting extension, while said first extension has, opposite said fourth panel, a second projecting extension having a width greater than said first extension.

[0024] The width of the second protruding extension is understood to be in a transverse direction, perpendicular to the longitudinal direction of the strip. Thus, the first protruding extension will form the first folded tab and the first shoulder, while the second protruding extension will form the second folded tab. tiellement on itself and the second shoulder.

[0025] Furthermore, the cardboard blank according to the invention advantageously comprises a fifth panel transversely attached to one side of the other of said first panels, said other of said first panels having a thin oblong cutout along said fifth panel. Thus, the fifth panel will form said second flap and the thin oblong cutout will form said slot through which the second tab can be inserted.

[0026] Also, the blank according to the invention further comprises two sixth notched panels attached transversely respectively to the two second panels of said one side of said longitudinal strip. The two sixth notched panels will form the two third notched flaps respectively hinged to said second walls and will be respectively connected laterally to said third wall and said second flap.

[0027] Furthermore, said first protruding extension is preferably delimited from said third panel by a fold line, and said third panel has a U-shaped cutout comprising two opposing arms joining said fold line. Thus, when said first protruding extension is folded to form the first tab, the U-shaped cutout remains in a fixed position and forms said hooking tab, as will be explained in more detail later in the description.

[0028] Other features and advantages of the invention will become apparent from the following description of a particular embodiment of the invention, given by way of example but not limitation, with reference to the accompanying drawings in which:

[0029] [Fig.1] is a top view of a blank according to the invention;

[0030] [Fig.2] is a schematic right front perspective view of a package according to the invention in a first state;

[0031] [Fig.3] is a schematic top perspective view of the object in [Fig.2];

[0032] [Fig.4] is a schematic perspective view of the object of [Fig.2] in a second state; and,

[0033] [Fig.5] is a schematic cross-sectional view of the object of [Fig.4] in a third state;

[0034] Fig. 1 shows a blank 10 made from a double-sided corrugated cardboard sheet. In other words, the blank 10 is made from cardboard comprising a fluted paper sandwiched between two sheets of flat paper glued on each side. The flutes of the fluted paper are of a size that gives, for example, a thickness to the corrugated cardboard sheet of between 1 mm and 7 mm. Such a corrugated cardboard sheet is said to be "rigid" or "semi-rigid" because it can be folded manually under pressure.

[0035] Thus, the blank 10 has two opposite faces, a front face 11 appearing on the [Fig.1] and a rear face 13. It has a longitudinal band 12 divided into four panels: a first first panel 14 and a second first panel 16 of the same length, separated from each other by a first second panel 18 shorter than the first panels 14, 16; a second second panel 20, identical to the first second panel 18 is adjoining the first first panel 14 opposite the first second panel 18. In other words, the first 14 and second 16 first panels are long, while the first 18 and second 20 second panels are short.

[0036] For example, the first 14 and second 16 panels have a length between 330 mm and 360 mm, while the first 18 and second 20 panels have a length between 240 mm and 270 mm. Their height, however, is substantially the same, and is, for example, between 100 mm and 130 mm.

[0037] The longitudinal band 12 thus defines a longitudinal direction X of the blank 10, which is inscribed in the orthogonal coordinate system (X, Y) shown in [Fig. 1]. It will be observed that the grooves of the blank extend along the transverse direction Y in order to obtain better mechanical resistance of the packaging which will then be manufactured as explained below.

[0038] Also, the first first panel 14 is delimited from the first second panel 18 by a first transverse fold line 22, and from the second second panel 20 by a second transverse fold line 24. The second first panel 16 is delimited from the first second panel 18 by a third transverse fold line 26.

[0039] Also, the longitudinal band 12 ends with a connecting tab 28 adjoining the second first panel 16, opposite the first second panel 18 and delimited by a fourth transverse fold line 30.

[0040] The four transverse folding lines 22, 24, 26, 30 are substantially parallel to each other.

[0041] The blank 10 also includes a third panel 32 adjoining the first panel 14 and extending along one side of the longitudinal strip 12 in the transverse direction Y in the aforementioned coordinate system. The third panel 32 is delimited from the first panel 14 by a first long longitudinal fold line 34.

[0042] The third panel 32 has a first right lateral edge 36 extending in line with the first transverse fold line 22, and opposite it, a first oblique lateral edge 38. Also, the third panel 32 has a first front edge 40, from which a first projecting extension 42 extends. This first projecting extension 42 is delimited from the third panel 32 by a first tongue fold line 44, interrupted at a cutout. wide in U 46. The first projecting extension 42 has a first free edge 45.

[0043] Also, the third panel 32 has, on the side of the first first oblique lateral edge 38, a first first oblique fold line 48 forming an angle close to 10° with the first first oblique lateral edge 38. It will be observed that the first first oblique lateral edge 38 also extends at an angle close to 10° with respect to the first first straight lateral edge 36.

[0044] The oblique side edge 38 and the oblique folding line 48 make it easier to unfold the folded package.

[0045] Also, it will be observed that the first front edge 40 extends from the first long longitudinal fold line 34 by a distance substantially equal to or less than the length of the second panels 18, 20.

[0046] Opposite the third panel 32 relative to the first panel 14, the blank 10 comprises a fourth panel 50 adjoining the first panel 14 and extending transversely along the Y component of the aforementioned coordinate system. It has two parallel straight edges extending respectively in line with the first and second transverse fold lines 22, 24. Furthermore, the fourth panel 50 is delimited from the first panel 14 by a second long longitudinal fold line 52.

[0047] In addition, the blank 10 has, in the extension of the fourth panel 50, along the transverse direction Y, a first extension 54, which is delimited by a third first longitudinal fold line 56 parallel to the second first long longitudinal fold line 52 and at a distance substantially equal to or greater than the length of the second panels 18, 20. This first extension 54 will form a first flap as will be explained in more detail below.

[0048] Furthermore, the first extension 54 is itself extended by a second projecting extension 58, which has a width close to that of the opposing first extension 42. The second projecting extension 58 is delimited from the first extension 54 by a second tongue fold line 60.

[0049] The width of the second projecting extension 58 along the transverse direction Y is greater than that of the first extension 42, for example by double or triple.

[0050] Furthermore, the second projecting extension 58 has a border 62 delimited, on the one hand by a third tongue folding line 64, which is substantially parallel to the second tongue folding line 60, and on the other hand by a second free edge 65.

[0051] Also, the side 10 includes a fifth panel 66 adjoining the second first panel 16 and extending along the transverse direction Y on the same side of the longitudinal band 12 as the third panel 32.

[0052] The fifth panel 66 is delimited from the second first panel 16 by a first second long fold line 68. Also, the length of the fifth panel 66, according to the transverse direction Y, is approximately equal to half that of the third panel 32. The fifth panel 66 will form a second flap as will be explained in the rest of the description.

[0053] The fifth panel 66 has a second first right lateral edge 70 extending in line with the fourth transverse fold line 30, and opposite it, a second first oblique lateral edge 72. In addition, it has, on the side of this second first oblique lateral edge 72, a second first oblique fold line 74 forming an angle close to 10° with the second first oblique lateral edge 72, the latter itself extending at an angle close to 10° with respect to the second first right lateral edge 70.

[0054] Also, the second first panel 16 has a narrow oblong cutout 76 forming a slot along the first long second fold line 68 and the fifth panel 66. This oblong cutout 76 is centered on the second first panel 16 and its length is approximately half the length of the second first panel 16. Furthermore, the oblong cutout 76 has a median widening 78 defining two lateral stop edges, the function of which will be explained below. It will be noted that the width of this median widening 78 is substantially equal to the width of the wide U-shaped cutout 46 in the third panel 32.

[0055] The cardboard blank 10 also includes two identical notched sixth panels, a first 80 and a second 82, adjoining respectively the two second panels 18, 20 and extending along the transverse direction Y on the same side of the longitudinal band 12 as the fifth 66 and third 32 panels.

[0056] The two sixth notched panels 80, 82 are respectively delimited from the first second panel 18 and the second second panel 20 by a first short first fold line 84 and a first short second fold line 86.

[0057] Also, the average length of the two sixth notched panels 80, 82, along the transverse direction Y, is substantially equal to half that of the third panel 32.

[0058] Also, the first sixth panel 80 has a first second right edge 88 adjacent to the second first oblique lateral edge 72 and opposite a first second oblique lateral edge 90, adjacent to the first right lateral edge 36.

[0059] In addition, the first sixth panel 80 has, on the side of the first second right edge 88, a first second oblique fold line 92 forming an angle close to 45° with the first first short fold line 84. In this way, the first second oblique fold line 92 isolates a first triangular portion 94 of the first sixth panel 80.

[0060] Similarly, the second sixth panel 82 has a second second edge right 96 adjacent to the first first oblique lateral border 38 and opposite, a second second oblique lateral border 98.

[0061] In addition, the second sixth panel 82 has, on the side of the second right edge 96, a second oblique fold line 100 forming an angle close to 45° with the first short fold line 86. In this way, the second oblique fold line 100 isolates a second triangular portion 102 of the second sixth panel 82.

[0062] The two sixth panels 80, 82 will form two third flaps as will be explained below.

[0063] Also, on the other side of the longitudinal band 12, opposite the fifth panel 66, with respect to the second first panel 16, the blank 10 includes a seventh panel 104 adjoining the second first panel 16. This seventh panel 104 is delimited from the second first panel 16 by a second long fold line 106 parallel to the first long fold line 68. Its dimensions are close to those of the fourth panel 50.

[0064] In addition, the blank 10 comprises two eighth panels, a first 108 and a second 110 adjoining respectively the two second panels 18, 20 and respectively opposite the two sixth notched panels 80, 82.

[0065] The first eighth panel 108 is delimited from the first second panel 18 by a second short first fold line 112, while the second eighth panel 110 is delimited from the second second panel 20 by a second short second fold line 114.

[0066] Thus, such a blank 10 makes it possible to produce a pre-assembled foldable package as will be explained below.

[0067] First, according to a first step, the first protruding extension 42, forming the first tab, is glued to the front face 11, and it is folded 180° along the fold line of the tab 44 against the third panel 32 on the front face 11. Consequently, the wide U-shaped cut 46 allows a hooking tab 116 to be detached, which can be seen in [Fig.2] and which then protrudes from the first front edge 40. Also, the first free edge 45 of the first protruding extension 42 then defines a first shoulder 118.

[0068] Next, according to a second step, with regard to [Fig.1], the first 94 and second 102 triangular portions of the first 80 and second 82 sixth panels are folded 180° respectively along the first 92 and second 100 second oblique folding lines, front face 11 against front face 11.

[0069] And then we glue the first 94 and second 102 triangular portions thus folded, and also the connecting tab 28 on its front face 11.

[0070] According to a third step, not only are the first 80 and second 82 folded The sixth panels are folded along the first 84 and second 86 short fold lines, respectively, while the third 32 and fifth 66 panels are folded along the first 34 and second 68 long fold lines. The first 80 and second 82 sixth panels, as well as the third 32 and fifth 66 panels, are folded 180°, back face 13 against back face 13, that is, against the two second panels 18 and 20 and the first two panels 14 and 16, respectively.

[0071] In a fourth step, the second first panel 16 is then folded first by 180°, rear face 13 against rear face 13, along the third transverse folding line 26, and then the second second panel 20 is folded by 180°, rear face 13 against rear face 13, along the second transverse folding line 24.

[0072] Consequently, the lateral edge of the second panel 20, opposite the second transverse fold line 24, is applied to the glued connecting tab 28. Also, the second triangular portion 102, glued on its rear face, is applied flat against the front face 11 of the third panel 32, while the front face 11 of the fifth panel 66 is applied flat against the first triangular portion 94, glued on its rear face 13.

[0073] Consequently, the second first panel 16 is attached to the second second panel 20 on the one hand, and the second sixth panel 82 is attached to the third panel 32, while the first sixth panel 80 is attached to the fifth panel 66.

[0074] At the end of this fourth step, the pre-assembled, foldable packaging conforms to the invention. Its unfolding, to form a package, will now be described with reference to [Fig.2], [Fig.3], [Fig.4] and [Fig.5] while referring to [Fig.1].

[0075] First, the first first panel 14 and the first second panel 18 are folded towards each other 14, along the first transverse folding line 22, while the second first panel 16 and the second second panel 20 are also folded towards each other along the fourth transverse folding line 30.

[0076] The first two panels 14, 16 then form two first walls 124, 126, parallel to each other, while the second two panels, 18, 20 form two second walls 128, 130 parallel to each other and perpendicular to the first two walls 124, 126. The first two walls 124, 126 and the second two walls 128, 130 thus define a receiving volume 115.

[0077] During the deployment of the first panels 14, 16, and the second panels 18, 20, the two sixth notched panels 80, 82, or two third flaps, unfold and sequentially cause the fifth panel 66, or second flap, to come into contact with them, and then the third panel 32.

[0078] The first front edge 40 and the hooking tab 116 then come into friction against the inside of one of the first two walls 124, 126, until the locking tab 116 engages in the oblong cutout 76 forming a slot. The locking tab 116 then engages precisely inside the central widening 78 between its two lateral stop edges. It is thus laterally secured, which increases the mechanical strength of the assembly.

[0079] The third panel 32 defines a support face 132 opposite a receiving face 134 as shown in [Fig.2]. It is applied, support face 132 against the second flap 66, forming a third wall, or back wall 136 which can be seen in [Fig.5].

[0080] Thus, the second flap 66 is held substantially perpendicular to one 126 of the first two walls 124, 26 to which it is attached, and resting on the two third flaps 80, 82, which themselves extend substantially perpendicularly and respectively from the two second walls 128, 130. The third panel 32 forming the back wall 136, is then held firmly by the second flap 66, substantially perpendicular to the other first wall 124.

[0081] The receiving volume 115 can then be filled with goods to be preserved and shipped. Also, the two eighth panels 108, 110 forming the two fourth flaps are folded towards each other against the goods to be preserved, while the seventh panel 104 forming the fifth flap, is folded and applied over the two fourth flaps.

[0082] Next, the fourth panel 50, forming a fourth wall, is in turn folded to be applied against the fifth flap and to also form a lid.

[0083] We then find, on [Fig.4] the packaging thus produced.

[0084] The first extension 54, of the fourth wall, forming the first flap, will then be folded against said 126 of the first two walls 124, 126, while the second projecting extension 58 forming the second tongue will be engaged through the oblong cutout 76.

[0085] In [Fig.4], prior to engagement, the second projecting extension 58 is shown, the edge 62 of which is folded back on the rear face 13, with reference to [Fig.1]. Thus, the second free edge 65 appears, forming a second shoulder.

[0086] In addition, it will be observed that the folded edge 62 is not glued onto the second projecting extension 58 and that it remains slightly inclined so as to technically take advantage of the resilience of the cardboard.

[0087] Thus, the projecting extension 58, forming the second tab, is inserted through the oblong cutout 76 and between the fifth panel 66, forming the second flap, and the wide U-shaped cutout 46, extended by the first projecting extension 42, not shown in [Fig. 4]. The first projecting extension 42 forms the The first tab is folded down and glued against the third panel 32. The engagement of the projecting extension 58 thus occurs freely without interaction with the contents of the receiving volume. Indeed, it is protected from this by the back wall 136 against which the goods rest.

[0088] The first protruding extension 42 is hidden in [Fig. 4]. As the protruding extension 58 is pushed through the oblong cutout 76, the folded edge 62 is brought into friction against the protruding extension 42, which is found in [Fig. 5], until the second free edge 65 extends beyond the first free edge 45, forming the first shoulder 118. The folded edge 62 relaxes considerably, taking into account the cardboard support, so that the free edge 65 comes to rest against the first shoulder 118. This occurs when the first extension 54, of the fourth wall 50, forming the first flap, is in contact with said 126 of the first two walls 124, 126.

[0089] Consequently, the projecting extension 58, forming the second tongue, is trapped between the fifth panel 66, forming the second flap, and the first projecting extension 42, forming the first tongue. Indeed, any backward movement of the projecting extension 58, for example by pulling on the first extension 54, causes the free edge 65 to press against the first shoulder 118 and thus blocks the translation of the projecting extension 58, or second tongue.

[0090] In this way, the package thus formed is perfectly locked, without the use of conventional adhesives. It can only be unlocked by tearing off the first extension 54, for example. In which case, such a breach is perfectly visible and cannot be repaired without leaving a trace.

Claims

Demands

1. Pre-assembled foldable cardboard packaging comprising: - two first walls (124, 126) held parallel to each other by two second walls parallel to each other (128, 130) respectively hinged to said two first walls, said two first walls (124, 126) being adapted to be carried perpendicular to said second walls (128, 130) defining a receiving volume (115); - a third wall (136) having two opposite faces (132, 134) and mounted hinged to one (124) of said two first walls so as to be able to engage with the other (126) of said two first walls forming a base, one (132) of said two opposite faces extending opposite said receiving volume (115);- a fourth wall (50) mounted hinged on said one (124) of said first two walls opposite said third wall (136) so as to be able to engage with the other (126) of said first two walls by forming a lid, said fourth wall (50) extending by a first flap (54) hinged so as to be able to be applied against the other (126) of said first two walls; characterized in that said third wall (136) has, opposite said one of said first walls, a first tab (42) folded against said one (132) of said two opposite faces to form a first hooking shoulder (118), while said first flap (54) has, opposite said fourth wall (50), a second tab (58) folded partially on itself by forming a second hooking shoulder (65);and in that said second tongue (58) is adapted to be engaged through said other (126) of said first two walls to come opposite said one (132) of said two faces so that said first (118) and second (65) shoulders come into contact with each other.;

2. Packaging according to claim 1, characterized in that it comprises a second flap (66) hinged on said other (126) of said first two walls along a first line of articulation so as to be able to be applied against said (132) one of said two opposite faces.

3. Packaging according to claim 2, characterized in that said other (126) of said first two walls has a slot (76) along said first line of articulation in order to be able to engage said second tongue (58).

4. Packaging according to claim 2 or 3, characterized in that it comprises two third notched flaps (80, 82) respectively hinged on said second walls (128, 130) and respectively connected laterally to said third wall (136) and said second flap (66).

5. Packaging according to claim 4, characterized in that it comprises two fourth flaps (108, 110) respectively hinged on said second walls (128, 130) opposite said two third flaps (80, 82).

6. Packaging according to any one of claims 2 to 5, characterized in that it comprises a fifth flap (104) hinged on said other (126) of said first two walls opposite said second flap (66).

7. Packaging according to any one of claims 1 to 6, characterized in that said first tab (42) is glued against said one (132) of said two opposite faces.

8. Packaging according to any one of claims 1 to 7, characterized in that said third wall (136) has, opposite said one of said first walls, an anchoring tab (46) adapted to engage in said other (126) of said first two walls.

9. Cardboard blank for making packaging according to any one of claims 1 to 8, characterized in that it comprises: - a longitudinal strip (12) comprising two first panels (14, 16) separated from each other by a first second panel (18) and a second second panel (20) adjoining one (14) of said first panels opposite said first second panel (16); - a third panel (32) adjoining transversely to one (14) of said first panels, on one side of said longitudinal strip; - a fourth panel (50) adjoining transversely to said one of said first panels (14) opposite said third panel (32), said fourth panel having a first extension (54);characterized in that said third panel (32) has, opposite said one of said first panels (14), a first projecting extension (42), while said first extension (54) has, opposite said fourth panel (50), a second projecting extension (58) having a width greater than said first; extension (42).

10. Cardboard blank according to claim 9, characterized in that it further comprises a fifth panel (66) transversely adjoining the other (16) of said first panels of said one side of said longitudinal strip (12), said other of said first panels having a thin oblong cutout (76) along said fifth panel (66).

11. Cardboard blank according to claim 9 or 10, characterized in that it further comprises two sixth notched panels (80, 82) transversely adjoining respectively the two second panels (18, 20) of said one side of said longitudinal strip (12).

12. Cardboard blank according to any one of claims 9 to 11, characterized in that said first projecting extension (42) is delimited from said third panel (32) by a fold line (44) and in that said third panel (32) has a U-shaped cut comprising two opposing branches joining said fold line.

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