Packaging box

Abstract

To provide a packaging box that can be easily assembled.SOLUTION: In a packaging box, front and back side plates 13, which are made up of inner and outer plates, at opposite front and back sides of a rectangular central plate 12, left and right side plates 14, which are made up of inner and outer plates, at opposite left and right sides of the central plate 12, insertion plates 35 at both lateral sides of the inner plates of the left and right side plates 14, and a connecting plate 36 that is continuous with the lateral side of the outer plates of the adjacent front and back side plates 13 and the lateral side of the outer plates of the left and right side plates 14 are connected via a fold line, respectively, and the front and back side plates 13 and the left and right side plates 14 are erected with respect to the central plate 12 by folding the fold line, and the insertion plate 35 and the connecting plate 36 are held between the inner plate and the outer plate of the front and back side plates 13. The outer plate and the inner plate of the left and right side plates 14 are folded over, and a folding crease is applied to the fold line between the central plate 12 and the outer plate of the left and right side plates 14, and / or the fold line between the central plate 12 and the outer plate of the front and back side plates 13, to form a primary assembly.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a packaging box that is easy to assemble. [Background technology]

[0002] Conventionally, a paper box has been known in which front and rear side panels, each consisting of an inner panel and an outer panel, are connected to the opposing front and rear edges of a rectangular bottom panel, and left and right side panels, each consisting of an inner panel and an outer panel, are connected to the opposing left and right edges of the bottom panel, with overlapping pieces connected to the lower edges of each inner panel and insertion flaps connected to both side edges of the inner panels of the left and right side panels, and the front and rear side panels and the left and right side panels are erected against the bottom panel, the insertion flaps are sandwiched between the inner and outer panels of the front and rear side panels, and both ends of the overlapping pieces of the front and rear side panels are pressed by either or both ends of the overlapping pieces of the left and right side panels or the lower edges of the left and right side panels, thereby maintaining the box shape. This paper box is stored in the form of a paper box development formed by punching out paperboard, and is folded along each fold line when used to assemble the box (see Patent Document 1). [Prior art documents] [Patent documents] [Patent Document 1] Patent No. 4350118

[0003] However, the paper box requires a large storage space in the expanded form, and a large working space is also required for assembly. In addition, the work of folding each fold line is complicated, so assembly takes time, and skill is required to assemble the paper box beautifully. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made to solve the above problems. An object of the present invention is to provide a packaging box that can be stored compactly, does not require a large working space, and can be easily and beautifully assembled. [Means for solving the problem]

[0005] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0006] In a first invention, a packaging box has front and rear side panels consisting of an inner panel and an outer panel on opposing front and rear edges of a rectangular central panel, left and right side panels consisting of an inner panel and an outer panel on opposing left and right edges of the central panel, insertion panels on both sides of the inner panel of the left and right side panels, and connecting panels continuing to side edges of the outer panels of the adjacent front and rear side panels and side edges of the outer panels of the left and right side panels, each of which is connected via a fold line, and the front and rear side panels and the left and right side panels are erected against the central panel by folding the fold lines, and the insertion panels and the connecting panels are sandwiched between the inner and outer panels of the front and rear side panels, and the outer panels and inner panels of the left and right side panels are folded over and creases are made in the fold lines between the central panel and the outer panels of the left and right side panels and / or the fold lines between the central panel and the outer panels of the front and rear side panels to form a primary assembly.

[0007] In a second invention, a packaging box has front and rear side panels consisting of an inner panel and an outer panel on opposing front and rear edges of a rectangular central panel, left and right side panels consisting of an inner panel and an outer panel on opposing left and right edges of the central panel, insertion panels on both sides of the inner panel of the left and right side panels, and connecting panels continuing to side edges of the outer panels of the adjacent front and rear side panels and side edges of the outer panels of the left and right side panels, each of which is connected via a fold line, and the front and rear side panels and the left and right side panels are erected against the central panel by folding the fold lines, and the insertion panels and connecting panels are sandwiched between the inner and outer panels of the front and rear side panels, and the fold lines between the central panel and the outer panels of the front and rear side panels and / or the fold lines between the outer and inner panels of the front and rear side panels are folded over the central panel to form a primary assembly.

[0008] In a third invention, a packaging box has front and rear side panels consisting of an inner panel and an outer panel on opposing front and rear edges of a rectangular central panel, left and right side panels consisting of an inner panel and an outer panel on opposing left and right edges of the central panel, insertion panels on both sides of the inner panel of the left and right side panels, and connecting panels continuing to side edges of the outer panels of the adjacent front and rear side panels and side edges of the outer panels of the left and right side panels, each of which is connected via a fold line, and the front and rear side panels and the left and right side panels are erected against the central panel by folding the fold lines, and the insertion panels and the connecting panels are sandwiched between the inner and outer panels of the front and rear side panels, and the fold line between the central panel and the outer panels of the front and rear side panels is made to fold, and the left and right side panels are folded over the central panel, and the outer panels and inner panels of the front and rear side panels are folded over to form a primary assembly.

[0009] In a fourth invention, a packaging box is provided which includes front and rear side panels consisting of an inner panel and an outer panel on opposing front and rear sides of a rectangular central panel, left and right side panels consisting of an inner panel and an outer panel on opposing left and right sides of the central panel, front and rear top panels between the inner and outer panels of the front and rear side panels, left and right top panels between the inner and outer panels of the left and right side panels, insertion panels on both sides of the inner panels of the left and right side panels, and connecting panels continuing to side edges of the outer panels of the adjacent front and rear side panels and side edges of the outer panels of the left and right side panels, all of which are connected via fold lines, and the front and rear side panels and the left and right side panels are erected relative to the central panel by bending the fold lines, and the insertion panels and the connecting panels are sandwiched between the inner and outer panels of the front and rear side panels, The packaging box is characterized in that a fold is made in either one of the fold lines between the outer panels of the left and right side panels and the left and right top panels or the fold line between the inner panels of the left and right side panels and the left and right top panels, and the other fold line is bent to fold the outer panels and inner panels of the left and right side panels together to form a primary assembly.

[0010] A fifth invention is the fourth invention, wherein a fold line is provided between the outer panels of the front and rear side panels and the front and rear top panels or between the inner panels of the front and rear side panels and the front and rear top panels, the other fold line is bent, and the outer panels and inner panels of the front and rear side panels are folded together to form a primary assembly.

[0011] A sixth invention is a packaging box according to the fourth or fifth invention, characterized in that a retaining plate is connected to the free end edge of the connecting plate via a fold line, and the retaining plate contacts the inner plates of the front and rear side panels to regulate the swinging of the front and rear side panels when the assembly of the packaging box is completed. Effect of the Invention

[0012] The present invention has the following advantages.

[0013] According to the first aspect of the invention, the outer and inner panels of the left and right side panels are folded over to form the primary assembly, which allows for compact storage. Furthermore, since the final assembly work is started from this state, less work space is required. Furthermore, since the primary assembly is formed by forming creases in the fold lines between the center panel and the outer panels of the left and right side panels and / or the fold lines between the center panel and the outer panels of the front and rear side panels, the work of erecting the front and rear side panels and / or the left and right side panels from the center panel becomes easy, and the final assembly work is easy, allowing for simple and beautiful assembly.

[0014] According to the second invention, the left and right side panels are folded over the central panel to form the primary assembly, which makes it easy to erect the left and right side panels during final assembly. In addition, the product can be stored compactly, and the final assembly can be started from this state, so less work space is required. In addition, the product is primarily assembled by forming folds in the fold lines between the central panel and the outer panels of the front and rear side panels and / or the fold lines between the outer and inner panels of the front and rear side panels, which makes it easy to fold the outer and inner panels of the front and rear side panels and / or to erect the outer panels of the front and rear side panels from the central panel, which makes the final assembly easy and beautiful.

[0015] According to the third invention, the left and right side panels are folded over the central panel to form the primary assembly, which makes it easy to erect the left and right side panels during final assembly. In addition, the product can be stored compactly, and the final assembly can be started from this state, so less work space is required. In addition, the front and rear side panels are folded over the outer and inner panels to form the primary assembly, which makes it easy to erect the front and rear side panels from the central panel, and the final assembly can be easily and beautifully done.

[0016] According to the fourth invention, the outer and inner panels of the left and right side panels are folded over to form the primary assembly, which makes it easy to erect the left and right side panels from the center panel during final assembly. In addition, the box can be stored compactly, and the final assembly can be started from this state, so that less work space is required. In addition, in a packaging box having a top panel, a fold line between the outer and upper panels of the left and right side panels or a fold line between the inner and upper panels of the left and right side panels is made to have a fold crease, and the other fold line is folded to fold the outer and inner panels of the left and right side panels over each other to form the primary assembly, so that even a top panel that is narrow and difficult to bend can be easily formed, and the final assembly can be easily performed and beautifully assembled.

[0017] According to the fifth invention, in addition to the effects of the fourth invention, a fold is made in either one of the fold lines between the outer panels of the front and rear side panels and the front and rear top panels or the fold line between the inner panels of the front and rear side panels and the front and rear top panels, the other fold line is bent, and the outer panels and inner panels of the front and rear side panels are folded over to form the primary assembly. Therefore, even upper panels that are narrow and difficult to bend can be easily formed, and the final assembly work is easy and the assembly can be beautifully done.

[0018] According to the sixth invention, in addition to the effects of the fourth and fifth inventions, when the assembly of the packaging box is completed, the retaining plate contacts the inner plates of the front and rear side panels to restrict the swinging of the front and rear side panels and the left and right side panels, making the final assembly work easy and allowing the box to be assembled beautifully in a simple manner.

[0019] [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a plan view showing a developed body 2 of the packaging box 1 of the first embodiment. [Diagram 2] 1 is a simplified perspective view showing a production process of a primary assembly of the packing box 1 of the first embodiment. FIG. [Diagram 3] 1 is a simplified perspective view showing a primary assembly of a packaging box 1 according to a first embodiment. [Figure 4] FIG. 4 is a simplified perspective view showing a final assembly process of the packing box 1 of the first embodiment. [Diagram 5] FIG. 4 is a plan view showing a developed body 4 of a packaging box 3 of a second embodiment. [Figure 6] 13 is a simplified perspective view showing a production process of a primary assembly of the packing box 3 of the second embodiment. FIG. [Figure 7] 13 is a simplified perspective view showing a production process of a primary assembly of the packing box 3 of the second embodiment. FIG. [Figure 8] FIG. 11 is a simplified perspective view showing a primary assembly of a packaging box 3 according to a second embodiment. [Figure 9] FIG. 11 is a simplified perspective view showing a final assembly process of the packing box 3 of the second embodiment. [Figure 10] FIG. 6 is a partially enlarged schematic perspective view of a packaging box 3 according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Next, a first embodiment and a second embodiment of the present invention will be described as examples. In this embodiment, the primary assembly refers to the form in which the expanded body for creating a packaging box is processed, transported, and stored, and the final assembly refers to the form in which the primary processed product is finally assembled when the packaging box is used. In addition, the fold lines in this embodiment refer to stripe-like portions provided for folding the unfolded body, and examples thereof include creases, cut lines, and perforations. In addition, the fold crease in this embodiment means that the fold line is folded once and then returned to a flat state, so that it is easier to fold the same portion again. For the sake of explanation, the short sides of the center plate 12 are referred to as the front and rear sides, and the long sides of the center plate 12 are referred to as the left and right sides. In addition, when the packaging box is assembled and placed with the center plate 12 facing down, the top and bottom directions are defined as the center plate 12 side being the bottom and the opening side being the top.

[0022] A packing box 1 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 4. The packaging box 1 according to the first embodiment is formed by assembling the developable body 2 shown in Fig. 1, and is used as a body box or a lid box. The packaging box 1 is formed of thick paper such as paperboard or corrugated cardboard. The front side of the developable body shown in Fig. 1 is shown as the inner side of the box.

[0023] The deployment body 2 will now be described. The central plate 12 of the deployable body 2 is a square flat plate portion, and in this embodiment, the central plate 12 is rectangular, but the central plate 12 may be square.

[0024] First, the front and rear side plates 13, each consisting of a first inner plate 22 and a first outer plate 21, are connected to the front and rear edges of the central plate 12. The first outer plate 21 is connected to the front and rear edges of the central plate 12 via a fold line, and the first inner plate 22 is connected to the first outer plate 21 via a fold line. The first inner plate 22 is connected to the opposite side of the side to which the first outer plate 21 is connected via a fold line to the first laminated plate 24. Protrusions 26 are formed on both sides of the first inner plate 22 and the first laminated plate 24. The protrusions 26 are inserted into insertion recesses 37, which will be described later, to hold the box upright when the packaging box 1 is assembled.

[0025] The left and right side plates 14, each consisting of a second inner plate 32 and a second outer plate 31, are connected to the left and right sides of the central plate 12. The second outer plate 31 is connected to the left and right sides of the central plate 12 via a fold line, and the second inner plate 32 is connected to the second outer plate 31 via a fold line. On the opposite side of the second inner plate 32 from the side to which the second outer plate 31 is connected, the second overlapping plate 34 is connected to the second inner plate 32 via a fold line. In addition, insertion recesses 37 are formed on both sides of the second overlapping plate 34. In addition, insertion plates 35 are connected to both sides of the second inner plate 32 via fold lines.

[0026] The side of the first outer plate 21 and the side of the adjacent second outer plate 31 are connected via fold lines by a connecting plate 36. A fold line is formed in the diagonal direction of this connecting plate 36, and the connecting plate 36 is formed so that when the first outer plate 21 and the second outer plate 31 are erected relative to the central plate 12, the connecting plate 36 is folded in half.

[0027] Next, a process for assembling the deployable body 2 into a primary assembly will be described. First, the fold line between the central plate 12 and the first outer plate 21 and the fold line between the second outer plate 31 and the connecting plate 36 are folded inward once and then returned to the original flat shape to form a fold habit. The second laminated plate 34 is folded outward along the fold lines, and the outer surface of the second inner plate 32 and the outer surface of the second laminated plate 34 are folded together.

[0028] Then, as shown in FIG. 2, the fold line between the second outer plate 31 and the second inner plate 32 is folded inward, the inner surface of the second outer plate 31 and the inner surface of the second inner plate 32 are folded together, the inner surface of the insert plate 35 and the inner surface of the connecting plate 36 are folded together, and the left and right side plates 14 and the second laminated plate 34 are folded inward at the fold line between the central plate 12 and the second outer plate 31 and the fold line between the first outer plate 21 and the connecting plate 36, and the insert plate 35 and the connecting plate 36 are overlapped on the inner surface of the first outer plate 21. Then, the inner surface of the second laminated plate 34 and the inner surface of the central plate 12 are fixed with an adhesive. In this embodiment, the inner surface of the second laminated plate 34 and the inner surface of the central plate 12 are fixed, but the effect of the present invention can be achieved even if they are not fixed. Also, the inner surface of the first outer plate 21 and the inner surface of the connecting plate 36 connected to the first outer plate 21 may be fixed with an adhesive or the like. In this case, when the left and right side plates 14 are erected from the central plate 12, the first outer plate 21 is also erected from the central plate 12 in conjunction with this, making assembly easier.

[0029] 3, the fold line between the first outer panel 21 and the first inner panel 22 is folded inwardly, and the inner surface of the first outer panel 21 and the inner surface of the first inner panel 22 are folded over each other. At this time, the insertion plate 35 and the connecting plate 36 are positioned between the first outer panel 21 and the first inner panel 22. In this manner, the primary assembly is completed. The product is transported and stored in this state, and final assembly is performed when it is used.

[0030] Next, the process of finally assembling the above primary assemblies to obtain a finished assembled product will be described with reference to FIG. First, the left and right side plate portions 14 are erected from the central plate 12. Then, the connecting plate 36 is folded in half at the fold line, and the outer surfaces of the connecting plate 36 are overlapped. Also, the insert plate 35 is bent at an angle toward the central plate 12. Then, the fold line between the central plate 12 and the first outer plate 21 is folded, and the front and rear side plates 13 are erected from the central plate 12. At this time, since the fold line has a folding tendency, they can be easily erected. In this state, the insert plate 35 and the connecting plate 36 are sandwiched between the first outer plate 21 and the first inner plate 22. Then, the fold line between the first inner plate 22 and the first overlapping plate 24 is folded at an angle, and the inner surface of the first overlapping plate 24 and the inner surface of the central plate 12 are overlapped, and the protruding portion 26 is inserted into the insertion recess 37, and the front and rear side plates 13 and the left and right side plates 14 are held erect. In this manner, the final assembly is completed.

[0031] In this manner, the packaging box 1 of this embodiment has front and rear side panels 13 consisting of the first inner panel 22 and the first outer panel 21 on the opposing front and rear sides of the rectangular central panel 12, left and right side panels consisting of the second inner panel 32 and the second outer panel 31 on the opposing left and right sides of the central panel 12, insertion panels 35 on both sides of the second inner panel 32 of the left and right side panels, and connecting panels 36 continuing to the side edges of the first outer panel 21 of the adjacent front and rear side panels 13 and the side edges of the second outer panel 31 of the adjacent left and right side panels 14, each connected via a fold line. The packaging box 1 is formed by bending the front and rear side panels 13 and the left and right side panels 14 to stand against the central panel 12, and sandwiching the insertion panel 35 and the connecting panel 36 between the first inner panel 22 and the first outer panel 21 of the front and rear side panels 13. A fold is made along the fold line between the central panel 12 and the first outer panel 21 of the front and rear side panels 13, the second outer panel 31 and the second inner panel 32 of the left and right side panels 14 are folded over, the left and right side panels 14 are folded over the central panel 12, and the first outer panel 21 and the first inner panel 22 of the front and rear side panels 13 are folded over to form a primary assembly.

[0032] Therefore, in the final assembly process, the second outer panel 31 and the second inner panel 32 can be easily erected by simply erecting the folded left and right side panels 14 from the central panel 12. Also, since the first outer panel 21 and the first inner panel 22 of the front and rear side panels 13 are folded over each other and a fold is made on the fold line between the central panel 12 and the first outer panel 21, the front and rear side panels 13 can also be easily erected, making assembly easy. Also, since the fold is made in the primary processing, there is no risk of failure to fold, and assembly can be easily and beautifully done. Furthermore, since the left and right side panels 14 are folded over the central panel 12 and the first inner panel 22 is folded over the first outer panel 21, it can be stored compactly and does not require a large working space. Second embodiment

[0033] Next, a packing box 3 according to a second embodiment of the present invention will be described with reference to Figures 5 to 10. In the second embodiment, the packing box 3 is significantly different from the first embodiment in that it has front and rear upper plates 23, left and right upper plates 33, a holding plate 41, and a protruding portion 25. A detailed description of the same parts as in the first embodiment will be omitted.

[0034] The packaging box 3 according to the second embodiment is formed by assembling the deployable body 4 shown in FIG. The development body 4 will now be described. Front and rear upper plates 23 are formed between the first outer plate 21 and the first inner plate 22 of the deployable body 4 via fold lines, and left and right upper plates 33 are formed between the second outer plate 31 and the second inner plate 32 via fold lines. When final assembly is completed, the front and rear upper plates 23 form upper plates connecting the upper end of the first outer plate 21 to the upper end of the first inner plate 22, and the left and right upper plates 33 form upper plates connecting the upper end of the second outer plate 31 to the upper end of the second inner plate 32, forming a frame-shaped opening.

[0035] A retaining plate 41 is connected via a fold line to the free end edge of the connecting plate 36 on the side connected to the side edge of the second outer plate 31 of the left and right side plates 14. The retaining plate 41 is formed with a wide portion having a width from the fold line as a base end to the free end edge that is approximately the same as the width between the fold line between the first outer plate 21 and the front and rear upper plates 23 and the fold line between the first inner plate 22 and the front and rear upper plates 23, and a narrow portion having a width narrower than this width.

[0036] The first inner plate 22 is cut into an approximately U-shape with the vicinity of the fold line between the first inner plate 22 and the first laminated plate 24 as the base end, to form a protruding portion 25. The width of the protruding portion 25 from the base end, which is the side connected to the first laminated plate 24, to the tip, which is the free end, is the same as or slightly narrower than the width between the fold line between the first outer plate 21 and the front and rear upper plates 23 and the fold line between the first inner plate 22 and the front and rear upper plates 23. The second inner plate 32 is cut into an approximately U-shape with the vicinity of the fold line between the second inner plate 32 and the second laminated plate 34 as the base end, to form a protruding portion 25. The width of the protruding portion 25 from the base end, which is the side connected to the second laminated plate 34, to the tip, which is the free end, is the same as or slightly narrower than the width between the fold line between the second outer plate 31 and the left and right upper plates 33 and the fold line between the second inner plate 32 and the left and right upper plates 33. The other parts are similar to those of the deployable body 2 of the first embodiment, and therefore the description thereof will be omitted.

[0037] Next, the process of assembling the deployable body 4 into a primary assembly will be described with reference to FIGS. First, the fold line between the central plate 12 and the first outer plate 21, and the fold line between the second outer plate 31 and the connecting plate 36 are temporarily folded inward and then returned to their original flat state to create folds.

[0038] Also, the fold lines between the second outer panel 31 and the left and right upper panels 33 are folded inward, and the inner surfaces of the second outer panel 31 are folded over and aligned with the inner surfaces of the left and right upper panels 33 and the second inner panel 32. The inner surfaces of the insertion panel 35 and the connecting panel 36 are then aligned and aligned. Then, the inner surfaces of the second overlap panel 34 and the central panel 12 are aligned and fixed together with an adhesive. This state is shown in FIG.

[0039] 7, the fold lines between the central plate 12 and the second outer plate 31 and the fold lines between the first outer plate 21 and the connecting plate 36 are bent inwardly, the left and right side plates 14 are folded over the central plate 12, and the outer surface of the insertion plate 35 and the inner surface of the connecting plate 36 are placed over the inner surface of the first outer plate 21. Here, the folded second outer plate 31 and the left and right upper plates 33 are unfolded and flattened, and the fold lines between the second outer plate 31 and the left and right upper plates 33 are folded over. At the same time, the fold lines between the second inner plate 32 and the left and right upper plates 33 are bent, and the second inner plate 32 and the left and right upper plates 33 are folded over.

[0040] At this time, the fold line between the second inner plate 32 and the second laminated plate 34 also bends, the outer surface of the second inner plate 32 and the outer surface of the second laminated plate 34 are folded over, and the protruding portion 25 is formed by the approximately U-shaped cut in the second inner plate 32. The free end of the protruding portion 25 abuts against the inner surface of the second outer plate 31, thereby positioning the second inner plate 32.

[0041] Next, the fold line between the front and rear upper plates 23 and the first inner plate 22 is folded inward once, and then returned to the original flat shape to create a fold. Then, as shown in FIG. 8, the fold line between the first outer plate 21 and the front and rear upper plates 23 is folded inward to align the inner surface of the first outer plate 21 with the inner surfaces of the front and rear upper plates 23 and the first inner plate 22. At this time, the insertion plate 35, the connecting plate 36, and the holding piece 41 are positioned between the first outer plate 21 and the first inner plate 22. In this way, the primary assembly is completed. In this state, the fold lines are created in the fold line between the center plate 12 and the first outer plate 21, the fold line between the second outer plate 31 and the connecting plate 36, the fold lines between the second outer plate 31 and the left and right upper plates 33, and the fold lines between the front and rear upper plates 23 and the first inner plate 22.

[0042] Next, the process of finally assembling the above primary assemblies to obtain a completed assembly product will be described with reference to FIG. First, the left and right side plate portions 14 are erected from the central plate 12. At this time, the folded second inner plate 32 and the left and right upper plates 33 are unfolded to form an angle, and the fold lines between the second outer plate 31 and the left and right upper plates 33 are folded to form the second outer plate 31 and the left and right upper plates 33 into an angle, forming the left and right upper plates. At this time, the fold lines between the second outer plate 31 and the left and right upper plates 33 are easily folded because they have a fold tendency. The free end of the protrusion 25 abuts against the inner surface of the second outer plate 31, maintaining a space between the second outer plate 32 and the second inner plate 31.

[0043] The connecting plate 36 is then folded along the fold line, and the insertion plate 35 is folded at an angle towards the central plate 12. The fold line between the central plate 12 and the first outer plate 21 is also folded, and the front and rear side plates 13 are erected from the central plate 12. At this time, a fold crease has been formed in the fold line between the central plate 12 and the first outer plate 21, so that the front and rear side plates 13 can be erected easily. The folded first outer plate 21 and the front and rear upper plates 23 are then unfolded to form an angle, and the fold line between the front and rear upper plates 23 and the first inner plate 22 is then folded at an angle to form the front and rear upper plates. At this time, a fold crease has been formed in the fold line between the front and rear upper plates 23 and the first inner plate 22, so that the front and rear upper plates can be folded easily.

[0044] Furthermore, the fold line between the first inner plate 22 and the first overlapping plate 24 is bent into an angle. At this time, the free end of the protruding portion 25 abuts against the inner surface of the first outer plate 21, positioning the second inner plate 32. Then, the inner surface of the first overlapping plate 24 and the inner surface of the central plate 12 are overlapped, and the protruding portion 26 is inserted into the insertion recess 37 to hold the front and rear side plates 13 and the left and right side plates 14 in place, completing the final assembly.

[0045] In this state, as shown in Figure 10, the connecting plate 26 and the insertion plate 35 are sandwiched between the first outer plate 21 and the first inner plate 22, preventing the front and rear side plates 13 and the left and right side plates 14 from opening outward from the box, and maintaining the front and rear side plates 13 and the left and right side plates 14 in an upright position. Here, for example, if the opposing insert plates 35 were extended further and their free ends were locked together, the front and rear side plates 13 and the left and right side plates 14 could be held upright more firmly; however, when the folding process is carried out by machine, the long insert plates could get in the way, the task of locking the insert plates together in the final assembly process could be cumbersome, and there are also cases where it is unavoidable to shorten the insert plates due to issues with the availability of cardboard. In this embodiment, in order to firmly hold the front and rear side panels 13 and the left and right side panels 14 upright even with a short insertion plate, a retaining plate 41 is connected to the connecting plate 36, and the retaining plate 41 is bent toward the first inner panel 22 and positioned below the front and rear top panels 23, and the free end edge of the wide portion of the retaining plate 41 (the portion whose width from the fold line to the free end edge is formed to be approximately the same width as the width between the fold line between the first outer panel 21 and the front and rear top panels 23 and the fold line between the first inner panel 22 and the front and rear top panels 23) abuts against the inner surface of the first inner panel 22, preventing the front and rear side panels 13 and the left and right side panels 14 from swinging and opening outward from the box, and firmly holding the front and rear side panels 13 and the left and right side panels 14 upright.

[0046] In this embodiment, the holding plate 41 is provided with a narrow portion (a portion in which the width from the folding line to the free end edge is narrower than the wide portion). When the holding plates 41 are connected in series as in this embodiment, the space between the insertion plate 35 and the holding plate 41 in the state of the deployable body 3 becomes narrow, making it difficult to punch out the shape of the deployable body 3 from cardboard. Therefore, forming the narrow portion in the holding plate 41 makes it easier to form the deployable body 4 without compromising the effect of the holding plate 41.

[0047] In this manner, the packaging box 3 of this embodiment comprises front and rear side panels 13 consisting of the first inner panel 22 and the first outer panel 21 on the opposing front and rear sides of the rectangular central panel 12, left and right side panels 14 consisting of the second inner panel 32 and the second outer panel 31 on the opposing left and right sides of the central panel 12, front and rear upper panels 23 between the first inner panel 22 and the first outer panel 21 of the front and rear side panels 13, left and right upper panels 33 between the second inner panel 32 and the second outer panel 31 of the left and right side panels, insert panels 35 on both sides of the second inner panel 32 of the left and right side panels 14, and connecting panels 36 continuing to the sides of the first outer panel 21 of the adjacent front and rear side panels 13 and the sides of the second outer panel 31 of the left and right side panels 14, all of which are connected via fold lines, and are folded to form the central panel 3 The packaging box 3 has front and rear side panels 13 and left and right side panels 14 standing upright against a central panel 12, and an insertion panel 35 and a connecting panel 36 sandwiched between a first inner panel 22 and a first outer panel 21 of the front and rear side panels 13, in which a fold crimp is made in the fold line between the second outer panel 31 and the left and right upper panels 33 of the left and right side panels 14, the fold line between the second inner panel 22 and the left and right upper panels 23 of the left and right side panels 14 is folded over to overlap the second outer panel 31 and the second inner panel 32 of the left and right side panels 14, a fold crimp is made in the fold line between the first inner panel 22 and the front and rear upper panels 23 of the front and rear side panels 13, the fold line between the first outer panel 21 and the front and rear upper panels 23 of the front and rear side panels 13 is folded over to overlap the first outer panel 21 and the first inner panel 22 of the front and rear side panels 13. In addition, a retaining plate 41 is connected to the free end edge of the connecting plate 36 via a fold line, and when the assembly of the packaging box 3 is completed, the retaining plate 41 contacts the first inner plate 22 of the front and rear side plates 13 to regulate the swinging of the front and rear side plates 13.

[0048] Therefore, in the final assembly, the second outer panel 31 and the second inner panel 32 can be easily erected by simply erecting the folded left and right side panels 14 from the central panel 12. In addition, the first outer panel 21 and the first inner panel 22 of the front and rear side panels 13 are folded and the fold line between the central panel 12 and the first outer panel 21 is folded, so that the front and rear side panels 13 can also be easily erected, and assembly is easy. In addition, the fold line between the second outer panel 31 and the left and right upper panels 33 of the left and right side panels 14 and the fold line between the first inner panel 22 and the front and rear upper panels 23 of the front and rear side panels 13 are folded to form a primary assembly, so that even the upper panel, which is narrow and difficult to bend, does not fail to fold and can be easily and beautifully assembled. Furthermore, since the left and right side panels 14 are folded over the central panel 12 and the first inner panel 22 is folded over the first outer panel 21, it can be stored compactly and does not require a large working space. In addition, when the final assembly of the packaging box 3 is completed, the retaining plate 41 contacts the first inner plate 22 of the front and rear side plates 13 to restrict the swinging of the front and rear side plates 13, thereby making the assembly easy and beautiful.

[0049] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, in addition to the folds made in these embodiments, a fold may be made in the fold line between the first inner plate 22 and the first laminated plate 24. In addition, in the second embodiment, the retaining plate 41 is connected to the free end edge of the connecting plate 36 on the side connected to the second outer plate 31, but it may also be connected to the free end edge of the connecting plate 36 on the side connected to the first outer plate 21.

[0050] The technical scope of the present invention broadly covers the entire range of the technical ideas truly intended by the invention that are apparent from the matters described in this specification and the drawings. [Explanation of symbols]

[0051] 1 Packaging box 2. Development 3 Packaging box 4. Development 12 Center plate 13 Front and rear side plates 14 Left and right side plates 21 1st outer plate 22 First inner plate 23 Front and rear upper plates 24 First laminate 25 Protrusion 26 Protrusion 31 Second outer plate 32 Second inner plate 33 Upper left and right plates 34 Second laminate 35 Insertion plate 36 Connecting plate 37 Insertion recess 41 Holding plate

Claims

1. Front and rear side panels each consisting of an inner panel and an outer panel are provided on the opposing front and rear sides of a rectangular central panel, left and right side panels each consisting of an inner panel and an outer panel are provided on the opposing left and right sides of the central panel, insertion panels are provided on both sides of the inner panel of the left and right side panels, and connecting panels are provided between the side edges of the outer panels of the adjacent front and rear side panels and the side edges of the outer panels of the left and right side panels, and are connected to each other via fold lines, A packaging box in which the folding lines are folded to erect front and rear side panels and left and right side panels with respect to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner panel and the outer panel of the front and rear side panels, a packaging box comprising: an outer panel and an inner panel of the left and right side panels folded together; and a fold line between the center panel and the outer panels of the left and right side panels and / or a fold line between the center panel and the outer panels of the front and rear side panels folded together to form a primary assembly.

2. Front and rear side panels each consisting of an inner panel and an outer panel are provided on the opposing front and rear sides of a rectangular central panel, left and right side panels each consisting of an inner panel and an outer panel are provided on the opposing left and right sides of the central panel, insertion panels are provided on both sides of the inner panel of the left and right side panels, and connecting panels are provided between the side edges of the outer panels of the adjacent front and rear side panels and the side edges of the outer panels of the left and right side panels, and are connected to each other via fold lines, A packaging box in which the folding lines are folded to erect front and rear side panels and left and right side panels with respect to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner panel and the outer panel of the front and rear side panels, a folding line between the center panel and the outer panels of the front and rear side panels and / or a folding line between the outer panels and the inner panels of the front and rear side panels are folded, and the left and right side panels are folded over the center panel to form a primary assembly.

3. Front and rear side panels each consisting of an inner panel and an outer panel are provided on the opposing front and rear sides of a rectangular central panel, left and right side panels each consisting of an inner panel and an outer panel are provided on the opposing left and right sides of the central panel, insertion panels are provided on both sides of the inner panel of the left and right side panels, and connecting panels are provided between the side edges of the outer panels of the adjacent front and rear side panels and the side edges of the outer panels of the left and right side panels, and are connected to each other via fold lines, A packaging box in which the folding lines are folded to erect front and rear side panels and left and right side panels with respect to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner panel and the outer panel of the front and rear side panels, a folding line between the center panel and the outer panels of the front and rear side panels is folded, the left and right side panels are folded over the center panel, and the outer panels and inner panels of the front and rear side panels are folded over to form a primary assembly.

4. front and rear side panels consisting of an inner panel and an outer panel on the opposing front and rear sides of a rectangular central panel, left and right side panels consisting of an inner panel and an outer panel on the opposing left and right sides of the central panel, front and rear upper panels between the inner and outer panels of the front and rear side panels, left and right upper panels between the inner and outer panels of the left and right side panels, insert panels on both sides of the inner panels of the left and right side panels, and connecting panels continuing to the side edges of the outer panels of the adjacent front and rear side panels and the side edges of the outer panels of the left and right side panels, A packaging box in which the folding lines are folded to erect front and rear side panels and left and right side panels with respect to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner panel and the outer panel of the front and rear side panels, a folding line between the outer panels of the left and right side panels and the left and right top panels or a folding line between the inner panels of the left and right side panels and the left and right top panels is given a fold crease, and the other fold line is bent to fold the outer panels and the inner panels of the left and right side panels together to form a primary assembly.

5. 5. The packaging box according to claim 4, wherein a fold is made in either one of the fold lines between the outer panels of the front and rear side panels and the front and rear top panels or the fold line between the inner panels of the front and rear side panels and the front and rear top panels, the other fold line is bent, and the outer panels and inner panels of the front and rear side panels are folded over to form a primary assembly.

6. 6. The packaging box according to claim 4, wherein a retaining plate is connected to a free end edge of the connecting plate via a fold line, and the retaining plate contacts inner plates of the front and rear side plates to regulate the swinging of the front and rear side plates when the assembly of the packaging box is completed.

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