ES1110730U - Stackable box made of cardboard or similar material (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Stackable box made of cardboard or similar material, comprising a rectangular base wall (11), two first opposite side walls (12) and two opposite second side walls (13) connected to said base wall (11) by respective ones first weak lines of opposite base (12a) and second weakened lines of base (13a) opposite and bent upwards, connecting flaps (14) connected to opposite side edges of said first two side walls (12) by respective lines weakened laterals (14a), bent towards the two second side walls (13) and adhered thereto, anchoring projections (15) protruding from upper edges of at least two of the first and second side walls (12, 13) or said connecting flaps (14), and anchoring openings (16) formed in the base wall (11) dimensioned and positioned to receive said anchoring projections (15) from another stackable box (5, 10) analogously located in an immediately lower position in a stacked situation, characterized in that the first two side walls (12) are inclined towards the inside of the stackable box (5, 10) each forming a first acute angle of inclination (a1) with the base wall (11) and the two second side walls (13) are inclined towards the inside of the stackable box (5, 10) each forming a second acute angle of inclination (a2) with the base wall (11), said upper edges of at least two of the first and second side walls (12, 13) determining a supporting surface on which another analogous stackable box (5, 10) located in a position immediately above in said stacked situation, rests; said support surface inscribed in a support rectangle smaller than the base wall (11), where orthogonal projections of opposite first sides of said support rectangle corresponding to said first side walls (12) on the base wall (11) are at a first separation distance (d1) of between 1 and 15 mm from said first weakened base lines (12a) and orthogonal projections of a few seconds opposite sides of said support rectangle corresponding to said second side walls (13) on the base wall (11) are at a second separation distance (d2) of between 1 and 15 mm from said second weakened base lines (13a). (Machine-translation by Google Translate, not legally binding)

Description

STACKABLE BOX MADE OF CARTON OR SIMILAR MATERIAL

Technical field

The present invention concerns a stackable box, truncated pyramidal configuration,

5 made of cardboard or similar material, and formed from a flat die plate, which is folded and glued by a machine for forming cardboard boxes or similar material. The stackable box of the present invention has special application in the packaging and transportation of fruit and vegetable products.

Within the scope of this description, the term "cardboard or similar material" encompasses sheet of

10 cardboard, corrugated cardboard sheet, plastic sheet, corrugated plastic sheet, and pen cardboard sheet, among others.

Background of the invention

In the state of the art stackable boxes made of cardboard or similar material are known, and automatic box-forming machines having various mechanisms for

15 supply flat sheets punched out of cardboard or similar material, fold and glue them to form stackable boxes. By way of example, document ES 1008620 U describes a stackable box made of cardboard, and document ES 2321575 B1 describes a machine for forming cardboard boxes from die-cut flat plates.

The current stackable boxes have a rectangular base wall and side walls

20 perpendicular to the base wall, and to ensure its positioning in a stacked situation from upper edges of at least two of the side walls, anchors protruding that fit into anchor openings formed in the base wall of another analogous box stand out located in an immediately higher position in the stack.

The upper edges of the opposite side walls provide a surface of

25 support on which the other analog box located in a position immediately above the stack rests, and this support surface is inscribed in a support rectangle which, by virtue of the perpendicularity of the side walls with respect to the base wall , has the same dimensions as the rectangle of the base wall, so that the side walls of all the boxes that form a stack are

30 mutually aligned.

A drawback of these stackable boxes made of current cardboard or similar material is that, due to vibrations and forces transmitted to the merchandise contained in the boxes during the transport of stacks of full boxes, generally arranged on pallets, there is a misalignment of the walls sides of the boxes in the stack that can cause the pile of boxes to collapse.

Exhibition of the invention

The present invention helps to mitigate the above and other inconveniences by providing a stackable box made of cardboard or similar material, which comprises a rectangular base wall, two first opposite side walls connected to said base wall by respective first weakened base lines. opposite and two second opposite side walls connected to the base wall by respective second weakened opposite base lines, where the first and second side walls are bent upwards. The box also includes connection flaps connected to opposite lateral edges of said first two side walls by respective weakened lateral lines, where said connection flaps are bent towards the second side walls and adhered thereto.

To ensure correct positioning of several boxes in a stacked situation, each box comprises anchor projections protruding from upper edges of at least two of the first and second side walls or connection flaps, and formed anchor openings in the base wall. Said anchor openings are sized and positioned to receive the anchoring projections of another analogous box located in an immediately lower position in the stacked situation, and accordingly the anchoring projections are sized and positioned to be inserted in the anchoring openings of another box. analogue located in an immediately superior position in the stacked situation.

In the case of the present invention, the first two side walls are inclined towards the inside of the case, each forming a first acute angle of inclination with the base wall and the two second side walls are inclined towards the inside of the case forming each a second acute angle of inclination with the base wall. Consequently, the upper edges of at least two of the first and second side walls or of the connection flaps determine a bearing surface on which another analogous box is placed located in an immediately superior position in said stacked situation, said surface being of support inscribed in a support rectangle smaller than the rectangle defined by the base wall.

Orthogonal projections of opposite first sides of said support rectangle corresponding to the first lateral walls on the base wall are at a first separation distance between 1 and 15 mm of said first weakened base lines, and orthogonal projections of opposite second sides of the support rectangle corresponding to the second side walls on the base wall are a second separation distance between 1 and 15 mm from said second weakened base lines.

Thus, the first and second separation distances are sufficiently short to ensure proper transmission of the loads from the side walls of a box to the side walls of another analogous box located in an immediately lower position in a stacked position and long enough to allow that stacked boxes experience vibrations and jolts during transport without any portion of the bearing surface of a box coming out of the base wall of another analog box located in an immediately superior position in the stacked situation.

Additionally, the truncated pyramid configuration of the stackable box of the present invention offers greater protection of the products contained therein by having a smaller upper opening in relation to other stackable boxes of comparable volume of the prior art, and greater stability given that the center of gravity of the box together with the products contained therein is lower in relation to other stackable boxes of comparable volume of the prior art.

The stackable box of the present invention is formed from a die-cut flat plate, in which the connection flaps have lower edges that are inclined towards ends of said flat plate corresponding to said first side walls and that form a first angle of template with respect to the first weakened base lines that connect the first two side walls to the base wall, and the weakened side lines that connect the connection flaps to the first two side walls are inclined towards the center of the flat plate and they form a second template angle with respect to said second weakened base lines that connect the two second side walls to the base wall.

The said first and second template angles are a function of said first and second acute angles of inclination as defined above, of said first and second separation distances as defined above, and of a box height measured between the wall of base and the support rectangle. Consequently, a designer can design, for example, a set of flat plates to form boxes of equal base and different heights in which the first and second separation distances are constant and the first and second acute angles of inclination are variable for the different heights, whereby boxes of different stackable heights are obtained from each other, or you can design for example flat sheets to form boxes of the same or different bases and different heights in which the first and second acute angles of inclination are constant, in which case only Boxes of the same type are stackable.

In one embodiment, the stackable box of the present invention has roof fins connected to upper edges of the first side walls by weakened roof lines and folded inward to a position substantially parallel to the base wall, and flaps of reinforcement that are connected to lateral edges of said roof fins by corresponding weakened lines, bent towards said connection flaps and adhered thereto.

In a variant of this embodiment, the box has no roof fins or reinforcement flaps, while in another variant the connection flaps are outside the second side walls, that is, the connection flaps have internal faces adhered to an outer faces of the second side walls.

In both variants of this embodiment, the stackable box comprises at least two of the anchoring projections, which protrude upward from central areas of the first side walls. In the variants provided with roof fins, the anchoring projections are formed by cutting lines in at least the roof fins, where said weakened roof lines are interrupted in the anchoring projections so that, when the roof fins they are bent to their operative position, the anchoring projections remain coplanar with the first side walls and protrude upwards from the roof fins. Correspondingly, the stackable box comprises at least two of said anchor openings formed in the base wall in positions corresponding substantially to the orthogonal projections of the anchoring projections on the base wall.

In another embodiment, each of the connection flaps is divided into a proximal portion), an intermediate portion and a distal portion by two weakened dividing lines substantially parallel to the corresponding lateral weakened line connecting the connection flap to the corresponding first wall side. These proximal, intermediate and distal portions are folded forming a triangular cross-sectional column in each inner corner of the box, where the proximal portions are adhered to the two second side walls and the distal portions are adhered to the first two side walls.

In a variant of this other embodiment, the columns are open, that is to say that the distal portions of the connection flaps are bent out of the respective columns and have their external surfaces adhered to internal surfaces of the first two side walls, while that in another variant the columns are closed, that is to say that the distal portions of the connection flaps are folded into the respective columns and have their internal surfaces adhered to the internal surfaces of the first two side walls.

In both variants of this other embodiment, the stackable box comprises at least four of said anchoring projections, each protruding from an upper edge of each of said intermediate portions of the connection flaps. Correspondingly, the box comprises at least four of said anchor openings formed in the base wall in positions corresponding substantially to the orthogonal projections of the anchoring projections on the base wall.

Brief description of the drawings

The above characteristics and advantages will be more fully understood from the following detailed description of some examples of embodiment, which are merely illustrative and not limiting, with reference to the accompanying drawings, in which:

Fig. 1 is a perspective view of a stackable box made of cardboard or similar material according to an embodiment of the present invention;

Fig. 2 is a perspective view of three stackable boxes of Fig. 1 in a stacked situation;

Fig. 3 is a top plan view of the stackable boxes in stacked situation of Fig. 2;

Fig. 4 is a cross-sectional view taken along the plane IV-IV of Fig. 3; Fig. 5 is a cross-sectional view taken along the plane V-V of Fig. 3;

Fig. 6 is a plan view of a flat sheet die of cardboard or similar material from which the stackable box of Fig. 1 is formed;

Fig. 7 is a perspective view of a stackable box made of cardboard or similar material 5 according to another embodiment of the present invention;

Fig. 8 is a plan view of a flat sheet die of cardboard or similar material from which the stackable box of Fig. 7 is formed;

Fig. 9 is a perspective view of a stackable box made of cardboard or similar material according to a variant of the embodiment of Fig. 1; Y

10 Fig. 10 is a perspective view of a stackable box made of cardboard or similar material according to another variant of the embodiment of Fig. 1.

Detailed description of some embodiments

Referring first to Fig. 1, the reference sign 5 generally designates a stackable box made of cardboard or similar material according to an embodiment of the present invention, which comprises a rectangular base wall 11, two first opposite side walls 12 connected to said base wall 11 by respective first opposite weakened base lines 12a (see also Fig. 6) and two second opposite side walls 13 connected to said base wall 11 by second weakened second lines of 13th base opposite. The first two side walls 12 are

20 bent upwards and inclined towards the inside of the stackable box 5 each forming a first acute angle of inclination A1 with the base wall 11 (Fig. 4) and the two second side walls 13 are bent upwards and inclined towards the inside the stackable box 5 each forming a second acute angle of inclination A2 with the base wall 11 (Fig. 5).

The stackable box 5 further comprises connection flaps 14 connected to opposite side edges of said first two side walls 12 by respective weakened lateral lines 14a (see also Fig. 6). These connection flaps 14 are bent towards the two second side walls 13 and adhered thereto.

Fig. 6 shows a flat plate 30 punched out from which the stackable box 30 of Fig. 1 is formed. In this flat plate 30, the connection flaps 14 have respective lower edges 22 that are inclined towards ends of said flat plate 30 corresponding to said first side walls 12 and form a first template angle B1 with respect to the first weakened base lines 12a and the aforementioned lateral weakened lines 14a are inclined towards the center of the flat plate 30 and form a second template angle B2 with respect to the second weakened base lines 13a.

When the first two side walls 12 and the corresponding connection flaps 14 are folded and raised to an operative position, the lower edges 22 of the connection flaps 14 rest on an inner surface of the base wall 11 in positions adjacent to the second weakened base lines 13a, so that the first template angle B1 determines the first acute angle of inclination A1 between the first two side walls 12 and the base wall 11 in the stackable box 5 and the second template angle B2 determines the second acute angle of inclination A2 between the two second side walls 13 and the base wall 11 in the stackable box 5, since the two second side walls 13 once folded and raised are adhered to an outer surface of the connection flaps 14.

In the flat plate 30 of Fig. 6, the weakened lateral lines 14a that connect the connection flaps 14 to the first lateral walls 12 start from misaligned points into the respective second weakened base lines 13a that connect the second lateral walls 13 to the base wall 11. This misalignment has a distance substantially equivalent to the thickness of the cardboard or similar material from which the flat plate 30 is made, and determines that in the box 5 the connection flaps 14 are arranged inside the two second side walls 13, with external surfaces of the connection flaps 14 adhered to internal surfaces of the second side walls 13.

The stackable box 5 of Fig. 1 further comprises some pockets formed by roof fins 17, which are connected to upper edges of the first side walls 12 by weakened lines of roof 17a (see also Fig. 6) , and reinforcing flaps 18, which are connected to lateral edges of said roof fins 17 by weakened lines 18a. The roof fins 17 are folded into the box to a position substantially parallel to the base wall 11, and said reinforcing flaps 18 are bent towards the connection flaps 14 and adhered to outer surfaces thereof.

In the first two side walls 12 and corresponding roof fins 17 there are cutting lines 15a that define two anchoring projections 15 that are connected to the corresponding two first side walls 12. Furthermore, said weakened roof lines 17a are interrupted in the anchoring projections 15, so that when the roof fins 17 are bent to their operating position substantially parallel to the base wall 11, the anchoring projections 15 remain coplanar with the corresponding first two side walls 12 and protrude upwards from the roof fins 17. On the base wall 11 two anchor openings 16 (see also Fig. 6) are formed in positions that in the stackable box 5 substantially correspond to the orthogonal projections of the anchoring projections 15 on the wall base 11.

The anchoring openings 16 are sized and positioned according to the anchoring projections 15. Thus, the anchoring projections 15 are inserted into the anchoring openings of another analogous stackable box 5 located in an immediately superior position in a stacked situation and the anchoring openings 16 receive the anchoring projections 15 from another analogous stackable box 5 located in an immediately lower position in a stacked situation.

As can be seen in the flat plate 30 of Fig. 6, the stackable box according to this embodiment has the anchoring openings 16 extending into the first two side walls 12 interrupting the first weakened base lines 12a. This feature is generally optional, and would only be essential if the positions of the anchoring openings16 were very close to the first two side walls 12 to additionally provide housings for the anchoring projections 15 on the first two side walls 12.

The first two side walls 12 have formed handle openings 24 (see also Fig. 6), each sized to allow the passage of the fingers of one hand, constituting handles by which a person can comfortably grab, lift and handle the stackable box 5 with both hands. It should be noted, however, that these handle openings 24 are optional.

In the embodiment shown in Fig. 1, the upper edges of the first side walls 12, 13, the roof fins 17 and portions of the connection flaps 14 provide a bearing surface on which another stackable box 5 rests. analogue located in an immediately superior position in the stacked situation. This bearing surface is inscribed in a bearing rectangle, which by virtue of the truncated pyramid configuration of the stackable box 5 is smaller than the rectangle defined by the base wall 11 and delimited by the first and second weakened lines of base 12a, 13a.

Figs. 2, 3, 4 and 5 show a stack of boxes formed by three stackable boxes 5 as described above in relation to Fig. 1, and it can be seen that the support rectangle of each stackable box 5 has a shorter width Ws that the width Wb of the base wall 11 and a length Ls shorter than the length Lb of the base wall 11.

The support rectangle has first opposite sides corresponding to the first two side walls 12 and second opposite sides corresponding to the second second side walls 13. As shown in Fig. 4, orthogonal projections of the first opposite sides of the rectangle of lift on the base wall 11 are at a first separation distance D1 from the first weakened base lines 12a and, as shown in Fig. 5, orthogonal projections of the second opposite sides of the lift rectangle on the base wall 11 are at a second separation distance D2 from the second weakened base lines 13a. The first separation distance D1 is half the difference between the width Ws of the support rectangle and the width Wb of the base wall 11. The second separation distance D2 is half the difference between the length Ls of the rectangle of lift and the length Lb of the base wall 11.

In the flat plate 30 of Fig. 6 the reference sign Rs designates the orthogonal projection of the support rectangle on the base wall 11, with indication of the width Ws and length Ls of the support rectangle Rs, the width Wb and length Lb of the base wall 11, and the first and second separation distances D1 and D2, which are within a range of values between 1 and 15 mm. The measurements have as reference the external faces of the cardboard or similar material.

Both the first separation distance D1 and the second separation distance D2 are within a range of values between 1 and 15 mm. It has been found that this range of values is adequate to ensure that the loads are transmitted correctly from the side walls 12, 13 of a box to the side walls 12, 13 of another analog box located in an immediately lower position in a stacked situation and at the same time to allow stacked boxes to experience vibrations and jolts during transport without any portion of the bearing surface provided by upper edges of at least two of the first and second side walls 12, 13 of a box coming out of the base wall 11 of another analogous box located in an immediately superior position in the stacked situation.

Fig. 7 shows a stackable box 10 made of cardboard or similar material according to another embodiment of the present invention, which is analogous to the stackable box 5 described above in relation to Figs. 1 to 6, except that here the stackable box 10 has reinforcing columns 23 formed by the connecting flaps 14 in the four inner corners and has no headboards formed by roof fins and reinforcing flaps. In addition, in the stackable box 10 of Fig. 7, the anchoring projections 15 are associated with the columns 23. Accordingly, the description of those elements of the stackable box 10 of Fig. 7 which are common to the stackable box 5 of Fig. 1 will be omitted.

The stackable box 10 of Fig. 7 has each of the connection flaps 14 divided into three portions: a proximal portion 19; an intermediate portion 20; and a distal portion 21, by two dividing weakened lines 19a, 20a substantially parallel to the corresponding weakened lateral line 14a that connects the connection flap 14 to the corresponding first side wall 12 (see also Fig. 8). The mentioned proximal, intermediate and distal portions 19, 20, 21 of each connection flap 14 are folded forming the column 23, which has a triangular cross-section, in the corresponding inner corner. The proximal portion 19 is adhered to an inner surface of the second side wall 13 and the distal portion 21 is adhered to an inner surface of the first side wall 12.

In the embodiment shown in Fig. 7, the distal portions 21 of the connection flaps 14 are bent out of the corresponding columns 23. However, a variant embodiment not shown in the scope of the present invention is also within the scope of the present invention. that the distal portions 21 of the connection flaps 14 are folded into the corresponding columns 23 so that they are hidden behind the intermediate portions 20.

The stackable box 10 comprises in this embodiment four of the anchoring projections 15 formed protruding upwardly from upper edges of the intermediate portions 20 of the connection flaps 14 (see also Fig. 8), so that the four projections of Anchor 15 are arranged in columns 23 located at the corners and in diagonal positions with respect to the sides of the support rectangle. Correspondingly, the stackable box 10 comprises four anchor openings 16 formed in the base wall 11 (see also Fig. 8), also located diagonally with respect to the sides of the rectangle of the base wall 11 and in corresponding positions substantially to the orthogonal projections of the anchoring projections 15 on the base wall 11.

Fig. 8 shows a flat iron 40 of cardboard or similar material from which the box 10 of Fig. 7 is obtained. The flat iron 40 of Fig. 7 is analogous to the flat iron 30 described further. above in relation to Fig. 6, except for the characteristics of this embodiment described in relation to the stackable box 10 of Fig. 7. On the flat plate 40 of Fig. 7 the reference sign Rs designates the orthogonal projection of the support rectangle on the base wall 11, indicating the width Ws and length Ls of the support rectangle Rs, the width Wb and length Lb of the base wall 11, and the first and second distances of separation D1 and D2, which are within a range of values between 1 and 15 mm. Likewise, on the flat plate 40 of Fig. 7, the aforementioned first template angle B1, formed between a lower edge 22 of each connection flap 14 and the corresponding weakened first base line 12a, and second template angle are indicated B2, formed between each lateral weakened line 14a and the corresponding second base weakened line 13a.

Both in the flat plate 30 in Fig. 6 and in the flat plate 40 in Fig. 7, the first and second template angles B1, B2 are a function of said first and second acute angles of inclination A1, A2, of the first and second separation distances D1, D2, and a height H of the stackable box 5 measured between the base wall 11 and said support rectangle, and therefore can be calculated geometrically from these parameters.

Fig. 9 shows a box 25 which is a variant of the embodiment of the box 5 described above in relation to Fig. 1, where the only difference between the two is that the box 25 of Fig. 9 does not have the fins of roof 17 or the reinforcement flaps 18, so that two anchoring projections 15 protrude upward directly from central areas of the first opposite side walls 12. Accordingly, the box 25 of Fig. 9 can be formed from a flat plate (not shown) similar to the flat plate 30 of Fig. 6 but without the roof fins 17 or the reinforcement flaps 18.

Fig. 10 shows a box 28 which is another variant of the embodiment of the box 5 described above in relation to Fig. 1, where the only difference between the two is that the box 28 of Fig. 10 has the flaps of connection 14 arranged outside the two second side walls 13, with internal surfaces of the connection flaps 14 adhered to external surfaces of the second side walls 13. Accordingly, the box 28 of Fig. 10 can be formed to starting from a flat plate (not shown) similar to the flat plate 30 of Fig. 6 but in which the weakened lateral lines 14a connecting the connection flaps 14 to the first side walls 12 start from misaligned points out of the respective second weakened base lines 13a connecting the second side walls 13 to the base wall 11.

It should be noted that the arrangement of the connection flaps 14 arranged outside the two second side walls 13 shown in Fig. 10 could also be applied to the boxes of Figs. 1 and 9.

It should also be noted that in any of the embodiments and variants of the present invention the second side walls 13 may have second double wall flaps (not shown) connected to the upper edges of the second side walls 13 by respective weakened, bent lines inward and adhered to an inner surface of the second side walls 13, providing the second side walls 13 with double thickness areas.

In an analogous manner, in any of the embodiments and variants of the present invention that does not have the roof flaps 17, the first side walls 12 may have first double wall flaps (not shown) connected to the upper edges of the first side walls 12 by respective weakened lines, bent inward and adhered to an internal surface of the first side walls 12, providing the first side walls 12 with double thickness zones. In this case, in the corresponding double wall flaps there may be cut lines defining two anchoring projections connected to the corresponding two first side walls 12, with said weakened lines interrupted in the anchoring projections, in a manner similar to the described in connection with the cutting lines 15a defining the anchoring projections 15 in the embodiments and variants of the present invention having roof flaps 17.

The scope of the present invention is defined in the appended claims.

Claims (15)

1.- Stackable box made of cardboard or similar material, comprising a rectangular base wall (11), two opposite first side walls (12) and two second side walls (13) opposite connected to said base wall (11) by respective first lines 5 weakened opposite base (12a) and second weakened base lines (13a) opposite and folded up, connecting flaps (14) connected to opposite side edges of said first two side walls (12) by respective weakened lines sides (14a), bent towards the two second side walls (13) and adhered thereto, anchoring projections (15) protruding from edges 10 of at least two of the first and second side walls (12, 13) or of said connection flaps (14), and anchor openings (16) formed in the base wall (11) sized and positioned to receive said anchoring projections (15) of another analogous stackable box (5, 10) located in an immediately lower position in a stacked situation, characterized in that the first two side walls (12) are 15 inclined towards the inside of the stackable box (5, 10) each forming a first acute angle of inclination (A1) with the base wall (11) and the two second side walls (13) are inclined towards the inside of the stackable box (5, 10) each forming a second acute angle of inclination (A2) with the base wall (11), determining said upper edges of at least two of the first and second side walls (12, 13) 20 a bearing surface on which another analogous stackable box (5, 10) rests located in an immediately superior position in said stacked situation, said bearing surface being inscribed in a smaller bearing rectangle that the base wall (11), where orthogonal projections of opposite first sides of said support rectangle corresponding to said first side walls (12) on 25 the base wall (11) are at a first separation distance (D1 ) of between 1 and 15 mm of said first weakened base lines (12a) and orthogonal projections of opposite second sides of said support rectangle corresponding to dic Second side walls (13) on the base wall (11) are at a second separation distance (D2) between 1 and 15 mm of said second weakened lines of 30 base (13a). 2. Stackable box made of cardboard or similar material according to claim 1, characterized in that it comprises at least two of said anchoring projections (15) protruding upwards from central areas of the first side walls (12). 3. Stackable box made of cardboard or similar material according to claim 1, characterized in that roof fins (17) are connected to upper edges of the first side walls (12) by weakened lines of roof (17a) and folded inwards to a position substantially parallel to the base wall (11), and reinforcing flaps (18) are connected to lateral edges of said roof fins (17) by weakened lines (18a), bent towards said connection flaps (14) and attached to them. 4. Stackable box made of cardboard or similar material according to claim 3, characterized in that it comprises at least two of said anchoring projections (15) formed by cutting lines (15a) at least in the roof fins (17) , where said weakened roof lines (17a) are interrupted in the anchoring projections (15). 5. Stackable box made of cardboard or similar material according to claim 3 or 4, characterized in that it comprises at least two of said anchoring openings (16) formed in the base wall (11) in positions corresponding substantially to the projections orthogonal of the anchoring projections (15) on the base wall (11). 6. Stackable box made of cardboard or similar material according to claim 1, characterized in that each of said connection flaps (14) is divided into a proximal portion (19), an intermediate portion (20) and a distal portion ( 21) by two dividing weakened lines (19a, 20a) substantially parallel to the corresponding lateral weakened line (14a), where said proximal, intermediate and distal portions (19, 20, 21) are folded forming a triangular column at each corner, and where the proximal portions (19) are adhered to the two second side walls (13) and the distal portions (21) are adhered to the first two side walls (12). 7. Stackable box made of cardboard or similar material according to claim 6, characterized in that it comprises at least four of said anchoring projections (15) protruding from upper edges of each of said intermediate portions (20). 8. Stackable box made of cardboard or similar material according to claim 7, characterized in that it comprises at least four of said anchoring openings (16) formed in the base wall (11) in positions corresponding substantially to the orthogonal projections of the anchoring projections (15) on the base wall (11). 9. Stackable box made of cardboard or similar material according to any one of claims 1 to 5, characterized in that the connection flaps (14) are arranged outside the two second side walls (13), and internal surfaces of the connection flaps (14) are adhered to external surfaces of the second side walls (13). 10. Stackable box made of cardboard or similar material according to any one of claims 1 to 5, characterized in that the connection flaps (14) are arranged inside the two second side walls (13), and surfaces External of the connection flaps (14) are adhered to internal surfaces of the second side walls (13). 11. Stackable box made of cardboard or similar material according to any one of claims 5 to 7, characterized in that the distal portions (21) of the connection flaps (14) are folded out of the respective columns and external surfaces of the distal portions (21) are adhered to internal surfaces of the first side walls (12). 12. Stackable box made of cardboard or similar material according to any one of claims 5 to 7, characterized in that the distal portions (21) of the connection flaps (14) are folded into the respective columns and internal surfaces of the distal portions (21) are adhered to external surfaces of the first side walls (12). 13. Stackable box made of cardboard or similar material according to claim 1, characterized in that the first side walls (12) have first double wall flaps connected to upper edges of the first side walls (12) by respective weakened lines , folded inwards and adhered to an internal surface of the first side walls (12), providing the first side walls (12) with double thickness zones. 14. Stackable box made of cardboard or similar material according to claim 1, characterized in that second side walls (13) have second double wall flaps connected to upper edges of the second side walls (13) by respective weakened lines, folded inwards and adhered to an internal surface of the second side walls (13), providing the second side walls (13) with double thickness zones. 15.- Stackable box made of cardboard or similar material according to any one of the preceding claims, characterized in that the stackable box (5, 10) is formed to starting from a flat plate (30, 40) punched out, in which lower edges (22) of the connection flaps (14) are inclined towards ends of said flat plate (30, 40) corresponding to said first side walls ( 12) and form a first template angle (B1) with respect to said first weakened base lines (12a) and said lateral weakened lines 5 (14a) are inclined towards the center of the flat plate (30, 40) and form a second template angle (B2) with respect to said second weakened base lines (13a), wherein said first and second template angles (B1, B2) are a function of said first and second acute angles of inclination (A1, A2), of said first and second separation distances (D1, D2), and a height (H) of the stackable box (5, 10) 10 measured between the base wall (11) and said support rectangle.