FR2761341A1 - CASE OF SHEET MATERIAL WITH CENTERING TABS AND BLANK OR ASSEMBLY OF BLANKS FOR MAKING SUCH A CASE - Google Patents

Abstract

The invention concerns a box (1) and a blank in corrugated board sheet or the like, with polygonal cross section, comprising side surfaces, a top surface (6) forming a lid and a bottom surface forming the box base. The two opposite side surfaces (2, 4) are each extended by at least a tab (17) connected to said surface by a folding line (19), overlapping the external face of the top surface whereto it is glued. The base (7) comprises at least two corresponding recessed parts (16), perpendicular to the tabs and arranged for being fitted into the tabs of a box arranged underneath.

Description

SHEET OF MATERIAL WITH TONGS OF
CENTERING AND BLANK OR BLANK SET FOR THE
REALIZATION OF SUCH A CASE
The present invention relates to a box of corrugated sheet material or equivalent, of the type having a polygonal section, comprising lateral faces, an upper face forming a cover and a lower face forming the bottom of the box.

 It also relates to a blank or a set of blanks for the production of such a box.

 It finds a particularly important, although not exclusive, application in the field of stackable boxes on pallets, the lower boxes of which tend to be crushed in the event of a stack of too large a size.

The invention is also applicable to polygonal boxes with more than four sides which may present, when they are not completely filled, deformations in the event of lateral stress as well as less good resistance to compression.

 Box centering systems are already known by lateral tenons which cooperate with orifices placed on the edges of the packages. te such means are f-agil-s and do not resist ps al. l repeated repetitions.

 Locking systems are also known which make it possible to block a box cover, which then avoids these untimely deformations. These include locking by adhesive strips. However, such systems have drawbacks. They indeed require an additional constituent element of the body, namely the adhesive strip and consequently involves costs and additional operations; or during manufacturing.

 The present invention aims to provide a box, a blank and / or a set of blanks which respond better than those previously known to the requirements of practice, in particular in that it offers centering of the boxes one on the other making it possible to perfect stacking of boxes on top of each other, directly above each other, which has not been achieved in the past, industrially and repeatedly.

 It was thus possible to observe an improvement of 15% in compressive strength of the boxes located at the bottom of the pallet, with quality of scab cardboard, thanks to the centering according to the invention.

 Due to the possibilities of perfect filling that the centering according to the invention allows, the lower boxes are therefore better stressed in compression and resist better.

 To this end, the invention proposes in particular a case of material in a corrugated cartoon sheet or equivalent having a polygonal section, comprising lateral faces, an upper face forming at least partially the cover and a lower face forming the bottom of the box. , characterized in that at least two opposite lateral faces are each extended in the upper part, from their upper edge, by at least one tongue covering the external surface of said upper face to which the tongue is glued, so that said tongues constitute protruding protrusions with respect to the external surface of the upper face, and in that the bottom comprises at least two parts corresponding to said tongues, hollowed out in the lower face, of shapes complementary to the shapes of the tongues, in line with said tongues, said recessed parts or recesses being arranged to allow an interlocking t with the tabs of a box placed underneath.

In advantageous embodiments, use is made of one and / or the other of the following arrangements
- The - box is formed from a blank comprising a series of at least four main flaps connected together by junction lines, each main flap forming a lateral face and being provided with a lower flap located in a side of said main flap, said flaps being adapted to form the bottom of the box, and the cover of the box is constituted by an upper flap provided on its sides with first side flaps connected to said flap by first fold lines located opposite the upper edges of said side faces, and comprising slots located at the right of said tabs, at the level of the first fold lines, for passage of the tabs which are then folded over the external surface of the upper flap where they are glued;
the lower flaps comprise two opposite external flaps and two opposite internal flaps situated above said external flaps, said lower flaps being connected respectively to the lateral faces by second fold lines, the external flaps being connected to the lateral faces provided with tabs and comprising said recesses at the level of the second fold lines of complementary shape and arranged directly above the tabs;
- The lower flaps include two opposite external flaps and two opposite internal flaps located above said external flaps, said lower flaps being connected respectively to the side faces by second fold lines, the external flaps being connected to the side faces adjacent to the side faces provided tongues and comprising said recesses at their lateral edges, said recesses being of complementary shape and arranged vertically desdlt ~ ec ~ tongues;
the lower face and the lateral faces are formed at least in part by an open tray, comprising a lower flap forming the lower face, and lateral walls forming at least partly the lateral faces, said lower flap comprising said recesses at the level of the lines of junction with the side walls called second fold lines, the recesses being of complementary shape and arranged directly above said tongues;
- The upper face of the body is constituted by an upper flap provided with first flaps connected to said upper flap by first fold lines located opposite the upper edges of said side faces, and comprising slots located in line with said tabs, at level of the first fold lines, passage of the tabs which are then folded over the outer surface of the upper flap where they are glued;
- The box is formed from it blank whose external edges intended to form the upper edges of said box are provided with tongues and include adjacent recesses of complementary shape to said tabs;
- the body has two opposite lateral faces, each provided with a par. of two lateral flaps, located on either side of the corresponding lateral face, the-sdi b I lateral ahot forming at least in part the Db: adjacent lateral faces, and on the other hand of an upper flap situated on the side opposite the lower flap, said upper flaps forming at least partially the upper face, at least one of said lateral flaps being provided with a tab at its end situated on the side opposite to the lower flap, said tab being folded down and glued to the upper face the adjacent upper flap forming at least partially the upper face;
- The box has four opposing tongues two by two, glued to the outer surface of the upper face forming the cover of the box, and four recesses plumb in the lower face of the box;
- Each tongue has a rectangular or substantially rectangular or isosceles trapezoidal shape;
- The body is eight sides, namely four main sides separated by intermediate sides forming cut corners, and is formed around a mandrel.

 The invention also provides UI1 blank or a set of blanks allowing to obtain: a box as described above.

 It also proposes, in particular, a blank or set of blanks of material made of corrugated cardboard sheet or equivalent intended for a calsse shape with a polial section, comprising lateral faces, an upper face forming the cover and a lower face forming the bottom of the box. , characterized in that it comprises a first blank or a first blank portion intended to form the cover of the box, said first blank or said first blank portion comprising an upper flap provided with at least two first flaps, or comprising two so-called upper flaps, said upper flap or the two upper flaps being intended to form said upper face, in that it comprises a second blank or a second portion of blank suitable for constituting the lateral faces and the lower face of the body, comprising a lower flap or comprising at least two lower flaps, said lower flap or said two lower flaps being adapted to form said lower face and being connected to main flaps or side flaps, said main flaps or said side flaps being able to form at least partially the side faces of the body and being extended from their upper edge, by at at least two tabs arranged to cover the outer surface of said upper face to be glued to it during the formation of the box, and in that the lower flap or said two lower flaps comprise at least two recessed parts or at least four portions of parts hollowed out, corresponding to said tongues, to form recesses once the body formed, whose shapes are complementary to those of the tongues and which are arranged so as to be perpendicular to said tongues when the body is formed.

 In an advantageous embodiment, set of blanks comprises a first blank intended to form the cover of the box comprising an upper flap provided on its sides with first flaps connected to said flap by first fold lines, and a second blank comprising a series at least four main flaps forming the lateral faces linked together in pairs by junction lines, each main flap being provided with a lower flap situated on one side of said main flap, said lower flaps being suitable for forming the underside of the box, and in that said first fold lines include slots for passage of the tabs capable of being then folded down on said cover in order to be glued during the formation of the box.

 In an avartage-ux embodiment, said lower flaps comprise two opposite flaps and two opposite internal flaps arranged alternately, said lower flaps being connected respectively to the main flaps by second fold lines, the external flaps are connected to the lateral faces provided with tongues tq include the recesses of complementary shape with said tongues, at the level of the second fold lines and in line with said tongues.

 Advantageously, the lower flaps comprise two opposite external flaps and two opposite internal flaps arranged alternately, said lower flaps being connected respectively to the main flaps by second fold lines, the external flaps are connected to the main flaps adjacent to the flaps forming the side faces provided of tongues and comprise said recesses at their lateral edges, said recesses being of a shape complementary to that of said tongues.

 Advantageously, the blank or set of blanks comprises a lower flap capable of forming the lower face of the boxes, connected on each of its sides to lateral flaps or to end flaps adapted to form at least partially the lateral faces of the body, the lower olet comprising said recesses at the level: junction lines, said second fold lines, with two of said opposite lateral faces.

 Also advantageously in another embodiment, the blank or set of blank: s comprises a first blank suitable for forming the upper face of the body, constituted by a skirt-laughing flap provided with first flaps connected to said flight pta ê of the first lines folding fitted with feît: -s able to be located in line with said tabs when the box is formed.

 In an advantageous embodiment, the outer edges of two lateral flaps intended to form two opposite lateral faces of the body are provided with tongues and comprise adjacent recesses of complementary shape to said tongues.

 Advantageously, the blank has a rectangular- or substantially rectangular central flap, said lower flap provided with two lateral flaps connected on either side to said lower flap by intermediate fold lines, and comprises on its two other opposite sides two flaps d ends, said side flaps comprising two third side flaps connected to said side flaps by third fold lines and a fourth flap located on the side opposite to the lower flap, at least one of said third side flaps being provided with a tongue its lateral end situated in the extension of said longitudinal flap on the side opposite to the lower flap, and in that the lower flap comprises said recesses at the junction lines between end flap and lower flap, of shape complementary to those of the tongues.

 According to the embodiments of the invention more particularly described here, the blank or set of blanks comprises four tongues opposite two by two, and four corresponding recesses.

 The invention will be better understood on reading the following description of embodiments given by way of nonlimiting example.

It refers to the accompanying drawings, in which
- Figure 1 is a perspective view of a box according to a first embodiment of the invention.

 FIG. 2 is a plan view of a set of blanks making it possible to obtain the box of FIG. 1.

 - Figures 3 and 4 are plan views of two other embodiments of a set of blanks according to the invention.

 - Figure 5 is a perspective view of another embodiment of a box according to the invention.

 FIG. 5 is a plan view of the blank making it possible to obtain the box of FIG. 5.

 - Figure 7 is a perspective view of another embodiment of a box according to the invention with the cover open.

 FIG. 8 is a plan view of the blanks used to obtain the box of FIG. 7.

 - Figure 9 is a plan view of another embodiment: 4 'a blank belonging to a set according to inveilt.v n.

 In the following description, the same references designate identical body or blank elements.

 FIG. 1 shows a box 1 of corrugated cardboard, for example double-sided, 3 mm thick, of parallelepiped shape, comprising four rectangular lateral faces 2, 3, 4 and 5, namely two large faces 2 and 4 in screws opposite and two small end faces 3 and 5 facing each other.

 The box 1 also includes an upper face 6 forming the cover of the box and a lower face 7 forming the bottom of the boxes.

 More precisely and with reference to FIG. 2, the lateral faces are formed from a blank 8 comprising a series of four main rectangular flaps 2, 3, 4 and 5, linked together in pairs by junction lines parallel 9, the series being terminated at its end by a rectangular bonding tab 10, arranged to be bonded to the face 2 opposite, during the formation of the boxes.

 Each main flap is provided on one side with a lower flap 11, 12, 13 and 14, rectangular, suitable for forming the lower face 7 of a box and connected to the main flap by a second fold line 15, all the lines 15 being aligned.

 More precisely, the lower flaps e-omprenle-ît two internal flaps 12, 14, and two external raoa-t 11, 13, the external flaps each comprising two rectangular recesses 16 respectively cut in said flaps on three sides, the fourth side being merged or substantially confused with the second fold line.

 Each main flap comprises on the other side an upper free edge 15 ', forming the top of the side faces.

 The two main flaps 11 and 13 each further comprise two rectangular tongues 17 of shape complementary to that of the recesses, arranged in line with the latter (lines 18 in dashed lines in the figures), said tongues being connected to the upper edge 15 'corresponding by a fold line 19.

 The upper face 6 of the boxes, for its part, is formed by a blank 20 comprising a rectangular upper flap 21, of the same dimension as the bottom of the boxes, provided on its sides with first rectangular lateral flaps 22, connected to the upper flap by first fold lines 23, over their entire length, located opposite the upper edges 15 ′ of the side faces.

 Rectangular slots 24 of one or more dimensions l or substantially equal to those of the edges of the tongues, that is to say of the same width as, or of slightly greater width than the tongues, and of thickness equal or slightly greater than that of corrugated cardboard are provided on the right side of said tabs.

 When the cover is in place (see FIG. 1), the tongues 17 pass through the feints, then are folded towards the inside of the box around the fold lines 19, said fold lines being for example slightly offset towards the outside with respect to the upper edge 15 '.

 The tongues 17 are glued, for example with so-called "hot melt" glue, to the outer surface of the upper flap 21 so that said tongues constitute protuberances protruding from said outer surface.

 According to the invention, the recesses being of complementary shape to the shapes of the tongues and located at the right of the latter, this results in an interlocking of one box on the other with excellent lateral locking.

 As can be seen in FIG. 2, two blanks 8, 8 ′ (in phantom) can advantageously be cut facing each other from the same strip of cardboard, which allows optimization of the consumption of cardboard .

 Figures 3 and 4 show two other embodiments of blanks for box with cover provided.

 FIG. 3 shows a blank 3C whose external flaps 31 are attached to the adjacent shutters 3 and 5 iiix shutters 2 and 4 provided with the tongues 1.

 The flaps 31 are rectangular in shape and comprise, on their lateral edges, respectively, two rectangular recesses 32 and 33, opposite, of a shape complementary to that of the tongues and arranged to be arranged directly above said tongues when the box is formed.

 The other two flaps 31 ′ are here the internal flaps, and for example include recesses 34 at their edges 35 opposite the second fold lines 15, so as to optimize the manufacture of the cutouts (see FIG. 3), the tongues being cut in the flaps of the adjacent blank 30 '(in phantom), which minimizes cardboard drops.

 The blank 20 forming the cover is here identical to that of FIG. 2.

 FIG. 4 shows another blank mode 40 with two tabs 41, for example trapezoidal, located on the small main flaps 3 and 5.

 The offset (not shown) of the fold line 42 of the tongs on the side of the end of the tongue causes a greater protrusion at this level which promotes embedding with the recesses of the body above.

 The tongues 41 are for example centered with respect to the corresponding lateral face. They can also be arranged symmetrically with respect to the C-liter of the upper face f. figure 4).

 The bottom formed by the lower face 7 comprises meanwhile, plumb with the tongues 41, recesses of the same dimensions as the tongues with an adjustment tolerance of less than a millimeter, which allows perfect embedding between the tongue of a lower case and of course an upper case.

 To obtain the recesses here, the upper corners of the external flaps 43 are cut into half-recesses 44 of shape complementary to that of the centered half-tongues.

 To optimize the blank cutouts one behind the other (see blank 40 '), there is also a recess 45 in the internal flap 43' corresponding to the face 3, 5 of the tongue 41.

 Finally, the cover 46 of the type described above comprises two slots 47 suitable for being located directly above the tongues 41 when the cover is put in place.

 Figures 5 and 6 show another embodiment of a box 50 and a blank 51 according to the invention.

 The box is made up of a tray comprising a central flap re-ctangul.oer or lower flap 52 provided with two identical rectangular rectangular flaps 53, connected on either side to flap 52 by intermediate fold lines, 54, the flaps 53 form two complete side faces of the body.

 The lower flap 52 comprises, on its two other opposite sides, two rectangular or substantially rectangular end flaps 55 connected to the flap 52 by joining lines 56 perpendicular to the intermediate fold lines.

 The flap 52 comprises four recesses 57, for example in the shape of a trapezium, arranged symmetrically with respect to a plane of symmetry 58 of a catisse, one side of which is substantially coincident with the junction line 56.

 Each of the side flaps 53 comprises two third rectangular side flaps 59, connected to the side flaps by third fold lines located in the extension of the joining lines 56, and a fourth rectangular flap 60, located on the side opposite to the bottom flap 52 and connected to said side flap by a fourth fold line 61 parallel to the intermediate fold lines 54.

 Each of the third lateral flaps 59 comprises a tongue 62, of a shape complementary to that of the recesses, situated at its lateral end situated on the side opposite the lower flap, in the longitudinal extension of the flap, and arranged pe-u- --tre- plumb with the corresponding recess 57 when a body is formed.

 The tongues 62 are folded down and glued to the outer face 63 of the upper face formed by the fourth flaps 53.

 Figures 7 and 8 show another embodiment of a box 70 and a blank 71 according to the invention.

 The box consists of a tray 72 formed from the blank 71, and a cover 73 of the type described with reference to FIGS. 1 to 4.

 Here the tongues 74 are arranged staggered, one in relation to the other, the slots in the cover being provided accordingly.

 More specifically, the blank 71 comprises a series of three flaps, namely the central or lower flap 75 and two side flaps 76 connected to the central flap by intermediate fold lines 77.

 The recesses 78 are made in the central or lower flap at the level of the intermediate fold lines 77, one of the sides of the recesses being substantially coincident with said intermediate fold lines.

 The tabs 74 are located on the free edge 79 of the end of each of the side flaps, located opposite the central e-t directly above the corresponding recesses.

End flaps and third flaps (without tongue) are also provided to the type described above with reference to the figure
In FIG. 9, another embodiment has been shown in the blank of FIG. 8, comprising ID recesses mé.lages in the side flaps next to the tabs so as to allow cutting edge to edge, thus avoiding losses. of cardboard.

 The recesses 80 are arranged symmetrically with respect to the tongues with an offset of at least one width of tongue, with respect to the external edge of the lateral face.

 According to one embodiment of the invention, an offset is provided at the level of the fold line of the tongues, which can be obtained either by a double fold, or by an offset of the fold line itself, this offset always being greater than or equal to the thickness of the carton, towards and inside the tongue.

 Such a shift at the junction of the tongues and at the level of the plumb recess, favors the embedding and therefore further consolidates the stack of boxes during stacking.

 Such adjustments are also possible because the boxes can be made with sufficient precision, in particular because they are formed around a mandrel.

 As it goes without saying and as it follows moreover from the above, the present invention is not limited to the embodiments more particularly described here. On the contrary, it embraces all variants, and in particular those in which it also omits an added sheet of cardboard, reinforcing the bottom to avoid holes or orifices.

Claims (22)

 1. Box (1, 50, 70) of material of corrugated cardboard sheet or equivalent, having a polygonal section, comprising lateral faces (2, 3, 4, 5; 53, 59; 76), an upper face (6 , 63) at least partially forming the cover and a lower face (7; 52; 75) forming the bottom of the body, characterized  in that at least two opposite lateral faces (2, 4 59; 76) are each extended in the upper part, from their upper edge, by at least one tongue (17; 41; 62; 74) covering the external surface of said upper face to which the tongue is glued, so that said tongues constitute protrusions projecting from the outer surface of the upper face,  and in that the bottom (7; 52; 75) comprises at least two parts (16; 32; 33; 44. St 78) corresponding to said tongues hollowed out in the lower face, of shapes complementary to the shapes of the tongues, in line with said tabs, said recessed parts or recesses were arranged to allow an interlocking with the tabs of a box disposed below.  2. Box (1) according to claim 1, characterized in that it is formed from an urban blank (8) comprising a series of at least four main components (2, 3, 4, 5) connected between them by connecting lines (9), each main flap forming a lateral face and being provided with a lower flap (11, 12, 13, 14; 31, 31 ') located on one side of said main flap, said flaps lower being suitable for forming the bottom (7) of the box, and in that the cover (6) of the box is constituted by an upper flap (21, 46) provided on its sides with first side flaps (22) connected to said flap by first fold lines (23) located opposite the upper edges (15 ') of said side faces, and comprising slots (24, 47) located in line with said tabs, at the level of the first fold lines (23 ), passage of the tabs which are then folded over the outer surface of the upper flap.  3. Box according to claim 2, characterized in that the lower flaps comprise two opposite external flaps (11, 13) and two opposite internal flaps (12, 14) located above said external flaps, said lower flaps being connected respectively to the faces lateral por second fold lines (15), and in I-e- es external flaps (11, 13) are connected .t T: lateral (2, 4) provided with tabs and include said recesses (16) at the second fold lines (15) of complementary shape and arranged directly above the tabs (17).  4. Box according to claim 2, characterized in that the lower flaps (31, 31 ') comprise two opposite external flaps (31) and two opposite internal flaps (31') situated above said external flaps, said lower flaps being connected respectively to the side faces by second fold lines (15), and in that the external flaps (31) are connected to the side faces (3, 5) adjacent to the side faces (2, 4) provided with tabs and include said recesses (32, 33) at the lateral edges of said internal flaps, said recesses being of complementary shape and arranged directly above said tabs (17).  5. Box according to claim 1, characterized in that the lower face (52; 75) and the lateral faces (53, 59; 76) are formed at least in part by a tray, comprising a lower flap (52; 75) forming the lnférleure face, and side walls forming at least partially the side faces and in that said lower flap comprises said recesses (57, 78) at the level of the junction lines with the side walls cites-s second fold lines ( 56), the recesses (5.7, 78) being of complementary shape and arranged perpendicular to said tongues (62, 74).  6. Box according to claim 5, characterized in that the upper face of the box is established by an upper flap (21,? 3 provided with first flaps (22) connected to said upper flap by first fold lines (23) located opposite the upper edges (15 ') of said lateral faces, and comprises slots (24, 47) located in line with said tabs (74), at the level of the first fold lines, for passage of the tabs which are then folded over the outer surface of the upper flap where they are glued.  7. Box according to claim 6, characterized in that it is formed from a blank whose external edges intended to form the upper edges of said box are provided with tongues (74) and include recesses (80) adjacent to shape complementary to said tabs.  8. Box (50) according to claim 5, characterized in that it comprises two opposite lateral faces (53), each provided on the one hand with two lateral flaps (59) located on either side of the lateral face. corresponding, said side flaps (59) forming at least partially the two adjacent side faces, ev on the other hand an upper flap (60) located on the side opposite to the lower flap (52), said upper flaps (50) forming at least in part the upper face of the boxes, at least one of said lateral flaps (59) being provided with a tongue (52) at its end situated on the side opposite to the lower flap, said tongue was folded down and; upper face of the adjacent upper flap (60).  9. Box according to any one of the preceding claims, characterized in that it comprises four opposite tongues (17; 62 74) two by two, bonded to the external surface of the upper face forming the cover of the boxes, and four recesses ( 16; 32; 33; 57; 78) plumb in the underside of the box.  10. Box according to any one of the preceding claims, characterized in that each tongue has a substantially rectangular or isosceles trapezoidal shape.  11. Box according to any one of the preceding claims, characterized in that it is eight sides, namely four main sides separated by intermediate sides forming cut corners, and in that it is formed around a mandrel.  12. Blank (51) or set of blanks (8, 20 30, 20; 40, 46; 71, 73) of corrugated sheet material or equivalent intended to form a box with polygonal section comprising lateral faces, one face upper forming a cover and a lower face forming the bottom of the body, characterized  in that it comprises a first flair i2O, 46, 73) or a first portion of blank (60) intended to form the cover of the boxes, said plerllel-blank or said first portion of blank comprising here upper flap (21) provided with at least two p. remcers flaps (22), or comprising two so-called upper flaps (60), said upper flap or the two upper flaps being intended to form said upper face,  in that it comprises a second blank (8, 30, 40, 71) or a second portion of blank (52, 53, 55, 59) capable of constituting the lateral faces and the underside of the boxes, comprising a flap lower (52, 75) or comprising at least two lower flaps (11, 12, 13, 14; 31, 31 '; 43, 43'), said lower flap or said two lower flaps being suitable for forming said lower face and being connected to main flaps or side flaps adapted to form at least partially the side faces of the body and being extended from their upper edge, by at least two tabs (17, 41, 62, 74) arranged to cover the surface outside of said upper face to be glued to it during the formation of the body,  and in that the lower flap or said two lower flaps comprise at least two recessed parts (16; 32, 33; 57; 78) or at least four portions of recessed parts (44! corresponding to said tabs, called recesses, of said shapes are complementary to those of the tongues and which are arranged so as to be plumb I-e-dit-s tongues when the body and formed.  13. Set of blanks, 8, 20; 3C, 20; 40, 46) according to claim i2, characterized in that it comprises a first blank (20, 46) clesti: 1é a t .'t - - the cover of the box comprising an upper flap (21) provided on its sides first flaps (22) connected to said flap by first fold lines (23), and a second blank comprising a series of at least four main flaps (2, 3, 4, 5) forming the side faces connected together two by junction lines (9), each main flap being provided with a lower flap ((11, 12, 13, 14 31, 31 '; 43, 43') located on one side of said main flap, said lower flaps being able to form the lower face of the boxes, and in that said first fold lines include slots (24, 47) for passage of the tabs suitable for being then folded down over said cover so as to be glued there during formation from the crates.  14. set of blanks (8, 20) according to claim 13, characterized in that said lower flaps comprise two external flaps (11, 13) opposite and two internal flaps (12, 14 opposite arranged alternately, said lower flaps being connected respectlvement to the main flaps by second fold lines (151, and in that the external flaps (11, 13) are connected to the lateral faces provided with tongues 2, 4) and include said recesses (16) of complementary shape, at the level of the second lines this folding and in line with said tabs.  15. Set of blanks (30, 20) according to claim 13, characterized in that said lower flaps comprise two opposite external flaps (31) and two opposite internal flaps (31 ') arranged alternately, said lower flaps being connected respectively to the main flaps by second fold lines (15), and in that the external flaps (31) are connected to the main flaps (3, 5) adjacent to the flaps forming the side faces provided with tongues (17) and include said recesses (33) at their lateral edges, said recesses being of shape complementary to that of said tabs.  16. Blank or set of blanks (51; 71, 73) according to claim 12, characterized in that it comprises a lower flap (52, 75) capable of forming the lower face of the boxes, connected on each of its sides to lateral flaps (53, 76), or to end flaps (55), suitable for forming at least partially the lateral faces of the box, and in that the lower flap (52, 75) comprises recesses (57, 78) at the junction lines, say second fold lines (56) with two of said opposite lateral faces, of complementary shape and arranged in correspondence with said tongues.  17. Set of blanks (71, 73) according to claim 16, characterized in that it comprises A first blank (73) capable of forming the upper face of the body, constituted by url upper flap provided with first flaps connected to said flap by premib-res beach lines provided with slots adapted to be located at the right of said tabs when the body is formed.  18. Set of blanks according to claim 17, characterized in that the outer edges of two lateral flaps intended to form two opposite lateral faces of the body are provided with tongues and comprise adjacent recesses (80) of shape complementary to said tongues.  19. A blank according to claim 16, characterized in that it comprises a rectangular or substantially rectangular central flap, said lower flap (52), provided with two lateral flaps (53) connected on either side to said lower flap by intermediate fold lines (54), and comprises on its two other opposite sides two end flaps (55) said side flaps comprising two side flaps (59) connected to said side flaps (53) by third fold lines and a fourth end flap (60) located on the side opposite to the lower flap, at least one of said third side flaps connected to said side flaps being provided with a tongue (62) at its lateral end situated in the longitudinal extension of said flap on the side opposite to lower flap, and in that the lower flap (52) comprises said recesses (57) at the level of the junction lines between end flaps and lower flap, of co-shaped complementary with that of the tongues': ee-.  20. Blank or set of blanks according to any one of claims 12 to 19, characterized in that it comprises four tongues opposite two by two, and four corresponding recesses.  21. Blank or set of blanks according to any one of claims 12 to 20, characterized in that each tongue has a rectangular or substantially rectangular or Isosceles trapezoidal shape.  22. Blank or set of blanks according to any one of claims 12 to 21, characterized in that it comprises eight flaps, namely four main flaps separated by intermediate flaps forming cut corners, and in that it is arranged to be formed around a mandrel.