Packaging box

Abstract

Relates to a packaging box that is easy to assemble and robust. 【Solution means】A packaging box that can be assembled by folding a sheet material. The sheet material 2 has front and rear side portions 3 on the front and rear sides of a square central plate 11, and left and right side portions 4 on the left and right sides of the central plate. The front and rear side portions have an outer plate 12, an inner plate 14, and a pressing plate 15 on the front and rear sides of the central plate via a bending portion, and have an engaging convex portion 31 on the front and rear side portions. The left and right side portions have an outer plate 16, an inner plate 18, and a pressing plate 19 on the left and right sides of the central plate via a bending portion, and have an engaging concave portion 32 on the left and right side portions. By folding the bending portions of this sheet material, the left and right side portions and the front and rear side portions are erected with respect to the central plate. In maintaining the erection of the front and rear side portions and the left and right side portions, there are a first form in which the pressing plate of the left and right side portions is overlapped and locked on the pressing plate of the front and rear side portions, and a second form in which the pressing plate of the front and rear side portions is overlapped on the pressing plate of the left and right side portions and the engaging convex portion is locked in the engaging concave portion. It is a packaging box in which either one can be selected.

Description

Technical Field

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

Background Art

[0002] Conventionally, a cardboard provided with a bottom wall that is rectangular in plan view, outer walls continuously provided around the four sides of the bottom wall, inner walls continuously provided on the outer walls via strip-shaped frame pieces, and locking pieces continuously provided on the outside of the inner walls is assembled to form a double-side-wall assembled box having double side walls with a narrow strip portion (frame) around the bottom wall. Such a double-side-wall assembled box is known to have the advantages that it can be assembled by engaging the locking pieces on the front, rear, left, and right without the need for gluing, and since the four sides of the bottom wall are partially double-walled, the strength can be maintained (see Patent Document 1). For example, when a double-side-wall assembled box having such a configuration is assembled by an automatic box-making machine, when the cardboard folded into a predetermined shape at the bending portion is placed on the box-making portion, the left and right frame pieces, inner walls, and locking pieces are in a folded state, and then the left and right outer walls are folded and valley-folded and erected vertically. At this time, simultaneously, the front and rear outer walls are folded and valley-folded and erected vertically. At that time, the folding pieces connected to the left and right outer walls are valley-folded, the folding pieces connected to the front and rear outer walls are valley-folded, and each folding piece and the folding pieces are respectively folded and mountain-folded. Also, the ear pieces connected to the left and right inner walls are valley-folded. Subsequently, the cardboard with the front, rear, left, and right outer walls erected has the front and rear frame pieces valley-folded, the front and rear inner walls folded and valley-folded so as to wrap the folding sides and ear pieces, and the front and rear locking pieces are folded along the fold line so that the end sides abut against the upper surface of the bottom wall and are mountain-folded and enter between the left and right locking pieces. At the ends of the left and right locking pieces, the ends of the front and rear locking pieces are pressed, and the front and rear inner walls do not rotate upward and open to their original state, and also, at the front and rear inner walls, the ear pieces are pressed and the left and right inner walls do not open, and a double-side-wall assembled box is assembled (see Patent Document 1).

Prior Art Documents

Patent Documents

Patent Document 1

[0003] However, while the above double-sidewall assembled box can be made into a simple-structured and robust packaging box when assembled by an automatic box-making machine, when assembled manually, it is necessary to lift the left and right locking pieces and stack them on the side edges of the front and rear locking pieces, and the assembly work is complicated.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention has been made to solve the above problems. The object of the present invention is related to a robust packaging box that can easily hold up the standing side plates of the packaging box, whether it is assembled by an automatic box-making machine or manually.

Means for Solving the Problems

[0005] The problems to be solved by the present invention are as described above. Next, the means for solving these problems will be described.

[0006] In the first invention, there is a packaging box assembled by bending a sheet material. The sheet material has front and rear side portions on the front and rear sides of a square central plate, and left and right side portions on the left and right sides of the central plate. The front and rear side portions include an outer plate, an inner plate, and a pressing plate on the front and rear sides of the central plate via a bending portion, and have engaging convex portions on the front and rear side portions. The left and right side portions include an outer plate, an inner plate, and a pressing plate on the left and right sides of the central plate via a bending portion, and have engaging concave portions on the left and right side portions. A connecting plate is provided between the left and right sides of the outer plate of the adjacent front and rear side portions and the front and rear sides of the outer plate of the left and right side portions via a bending portion. Insertion plates are provided on the front and rear sides of the inner plate of the left and right side portions via a bending portion. By bending the bending portions of the sheet material, the left and right side portions are erected with respect to the central plate, the connecting plate is folded into the inside of the box, the insertion plate is bent at an angle, and the front and rear side portions are erected with respect to the central plate. The connecting plate and the insertion plate are sandwiched between the outer plate and the inner plate of the front and rear side portions. In maintaining the erection of the front and rear side portions and the left and right side portions, either a first form in which the pressing plate of the left and right side portions is overlapped and locked on the pressing plate of the front and rear side portions, or a second form in which the pressing plate of the front and rear side portions is overlapped on the pressing plate of the left and right side portions and the engaging convex portion is locked in the engaging concave portion can be selected. It is a packaging box characterized by this.

[0007] In the second invention, which is the first invention, the engaging convex portions are provided on the left and right sides of the pressing plate of the front and rear side portions, and the engaging concave portions are provided between the inner plate and the pressing plate of the left and right side portions. It is a packaging box characterized by this.

Effects of the Invention

[0008] According to the present invention, the erection and retention of the side plates of the packaging box can be easily achieved, and a robust packaging box can be obtained.

[0009]

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiment for Carrying Out the Invention

[0011] Next, embodiments of the present invention will be described. As shown in Fig. 4 or Fig. 6, the assembled packaging box 1 in this embodiment has front and rear side portions 3 erected on the front and rear sides of the central plate 11 and left and right side portions 4 erected on the left and right sides, and has an opening at the top.

[0012] The packaging box 1 can be formed of cardboard such as paperboard or corrugated board, but in this embodiment, paperboard with a thickness of about 0.4 mm is used. The packaging box 1 is formed by assembling the sheet material 2 shown in Fig. 1, and the sheet material 2 shows the side closer to the paper surface as the inner surface side of the box. In addition, the bending portion in this embodiment refers to a rib-shaped portion provided for bending the sheet material. Examples of the formation of the bending portion include by a score line, a cutting line, a sewing line, etc., and are illustrated by a broken line.

[0013] First, the sheet material 2 shown in Fig. 1 will be described. By bending and assembling the sheet material 1, the packaging box 1 shown in Fig. 4 or Fig. 6 is completed.

[0014] Hereinafter, for the sake of explanation, the short side of the central plate 11 is taken as the front and rear sides, and the long side of the central plate 11 is taken as the left and right sides. Also, in the vertical direction, when the packaging box 1 is assembled and placed with the central plate 11 facing down, the central plate 11 side is the lower side and the opening side is the upper side.

[0015] The central plate 11 of the sheet material 1 forms the bottom of the packaging box 1, and the outer plates 12, upper edge plates 13, inner plates 14, and pressing plates 15 form the front and rear side portions 3. Also, the outer plates 16, upper edge plates 17, inner plates 18, and pressing plates 19 form the left and right side portions 4.

[0016] The sheet material 1 has outer plates 12 continuously provided via bending portions on the front and rear sides of the rectangular central plate 11. Continuously with this outer plate 12, an upper edge plate 13 is continuously provided via a bending portion. Also, on the side opposite to the side where the outer plate 12 of this upper edge plate 13 is continuously provided, an inner plate 14 is continuously provided via a bending portion. Also, on the side opposite to the side where the inner plate 14 is continuously provided with the upper edge plate 13, a pressing plate 15 is continuously provided via a bending portion. On the left and right edge portions of the pressing plate 15, engagement convex portions 31 having a substantially U-shaped configuration protruding from the left and right edge portions are provided (see the enlarged view of part A in FIG. 2). This engagement convex portion 31 is a portion that locks to the engagement concave portion 32 in the assembly process of the second form.

[0017] Also, outer plates 16 are continuously provided via bending portions on the left and right sides of the central plate 11. Continuously with this outer plate 16, an upper edge plate 17 is continuously provided via a bending portion. Also, on the side opposite to the side where the outer plate 16 of this upper edge plate 17 is continuously provided, an inner plate 18 is continuously provided via a bending portion. Also, on the side opposite to the side where the inner plate 18 is continuously provided with the upper edge plate 17, a pressing plate 19 is continuously provided via a bending portion. The front and rear sides of the pressing plate 19 are cut slightly obliquely toward the center from the bending portion between the inner plate 18 and the pressing plate 19. Near the front and rear sides of the inner plate 18, an engagement concave portion 32 is provided by a substantially L-shaped cut between the inner plate 18 and the pressing plate 19 (see the enlarged view of part A in FIG. 2).

[0018] In addition, a connecting plate 20 is continuously provided between the adjacent outer plates 12 and 16 via a bent portion. A bent portion is formed in the connecting plate 20 in a diagonal direction from the corner of the central plate 11. When the outer plates 12 and 16 are erected with respect to the central plate 11, the connecting plate 20 is formed so as to be folded inward from this bent portion. In addition, holding plates 21 are continuously provided on the left and right sides of the connecting plate 20 via bent portions. In addition, insertion plates 22 are continuously provided on the front and rear sides of the inner plate 18 via bent portions.

[0019] Next, the assembly of the sheet material 2 will be described. In the present embodiment, the assembly of the first form is assembled by a conventional automatic box-making machine as described above, but the second form is assembled by hand, not by an automatic box-making machine.

[0020] First, the assembly of the first form will be described. The assembly of the first form uses a conventional automatic box-making machine. The sheet material 2 is supplied to the supply unit of the automatic box-making machine, conveyed along a guide body, bent, and assembled in a box-making unit. FIG. 4 shows a state where the assembly of the first form of the packaging box 1 is completed.

[0021] First, for the conveyed sheet material 2, the inner plate 18 is bent at the bent portion with respect to the upper edge plate 17, and the outer plate 16 and the inner plate 18 are overlapped, and the pressing plate 19 is also bent at the bent portion with respect to the inner plate 18. Next, the outer plate 16 and the inner plate 18 face each other and are erected with respect to the central plate 11. In addition, the connecting plate 20 is also bent at the bent portion and erected with respect to the outer plate 12.

[0022] In addition, the outer plate 12 is bent at the bent portion and erected with respect to the central plate 11. Then, the connecting plate 20 continuously provided between the outer plate 16 and the outer plate 12 is also bent at the bent portion in the diagonal direction and folded in half. In addition, the insertion plate 22 continuously provided on the inner plate 18 is also bent at an angle at the bent portion. Subsequently, the upper edge plate 13 is bent at the bending portion, and the inner plate 14 is bent at the bending portion while sandwiching the connecting plate 20, the holding plate 21, and the insertion plate 22. The holding plate 21 is bent into an angle shape so as to overlap below the upper edge plate 13. The holding plate 21 holds between the inner plate 14 and the outer plate 12.

[0023] Then, the pressing plate 15 abuts against the upper surface of the central plate 11 and is bent at the bending portion, and is overlapped on the central plate 11. Further, the pressing plate 19 is overlapped on the pressing plate 15, and the left and right end portions of the pressing plate 15 are pressed at the front and rear end portions of the pressing plate 19 (see FIG. 5), and the packaging box 1 of the first form is assembled.

[0024] Next, the assembly of the packaging box 1 of the second form will be described. FIG. 6 shows a state where the assembly of the second form of the packaging box 1 is completed. The packaging box 1 of the second form is assembled manually, not by an automatic box-making machine.

[0025] First, the left and right side portions 4 of the sheet material 2 are erected with respect to the central plate 11. Specifically, as shown in FIG. 3, the bending portion is bent to erect the outer plate 16 with respect to the central plate 11. Also, the connecting plate 20 is erected with respect to the outer plate 12. Next, the bending portions between the outer plate 16 and the upper edge plate 17, and between the upper edge plate 17 and the inner plate 18 are bent to oppose the inner plate 18 and the outer plate 16. Also, the bending portion is bent to overlap the pressing plate 19 on the central plate 11. At this time, the portion cut into a substantially L shape between the inner plate 18 and the pressing plate 19 is released and extends to the outer plate 16 side to form the engaging concave portion 32.

[0026] Next, the front and rear side portions 4 are erected. Specifically, the bending portion is bent to erect the outer plate 12 with respect to the central plate 11. Also, the bending portion between the outer plate 16 and the connecting plate 20 is bent, and the diagonal bending portion is bent to fold the connecting plate 20 inside the box. Also, the holding plate 21 is bent into an angle shape inside the box at the bending portion. Also, the insertion plate 22 is bent into an angle shape inside the box at the bending portion.

[0027] Next, the bent portions between the outer plate 12 and the upper edge plate 13, and between the upper edge plate 13 and the inner plate 14 are bent so that the inner plate 14 and the outer plate 12 face each other, and the connecting plate 20 and the insertion plate 22 are sandwiched between the inner plate 14 and the outer plate 12. The holding plate 21 is bent in an angle shape so as to overlap below the upper edge plate 13. The holding plate 21 holds the space between the inner plate 14 and the outer plate 12. Also, the bent portion between the inner plate 14 and the pressing plate 15 is bent to overlap the pressing plate 15 on the central plate 11. Then, in order to hold the standing of the front and rear side portions 3 and the left and right side portions 4, the pressing plate 15 is overlapped on the pressing plate 19, and the engaging convex portion 31 is locked to the engaging concave portion 32 (see FIG. 7), and the packaging box 1 of the second form is assembled.

[0028] In this embodiment, when assembling the packaging box 1, if an automatic box-making machine is used, the first form is selected, and if it is assembled by hand, the second form is selected and assembled. Therefore, regardless of which assembly method is selected, the side plates of the packaging box 1 can be easily erected and held, and a sturdy packaging box can be obtained.

[0029] As described above, the embodiments of the present invention have been described, but the present invention is not limited to these embodiments. The technical scope of the present invention widely extends to the entire scope of the technical idea truly intended by the invention revealed from the matters described in this specification and the drawings.

Explanation of Signs

[0030] 1 Packaging box 2 Sheet material 3 Front and rear side portions 4 Left and right side portions 11 Central plate 12, 16 Outer plates 13, 17 Upper edge plates 14, 18 Inner plates 15, 19 Pressing plates 20 Connecting plate 21 Holding plate 22 Insertion plate 31 Engaging convex part 32 Engaging concave part

Claims

1. A packaging box assembled by folding a sheet material, the sheet material having front and rear side portions at front and rear edges of a rectangular central plate, and left and right side portions at left and right edges of the central plate, the front and rear side portions having an outer plate, an inner plate, and a pressing plate at the front and rear edges of the central plate via folding portions, and engaging protrusions on the front and rear side portions, the left and right side portions having an outer plate, an inner plate, and a pressing plate at the left and right edges of the central plate via folding portions, and engaging recesses on the left and right side portions, A connecting plate is provided between the left and right sides of the outer plates of the adjacent front and rear side portions and the front and rear sides of the outer plates of the left and right side portions via a bent portion, Insert plates are provided at the front and rear edges of the inner plates of the left and right side portions via bent portions, The folding portions of the sheet material are folded to erect the left and right side portions relative to the central plate, the connecting plate is folded toward the inside of the box, the insert plate is folded in an angle shape, and the front and rear side portions are erected relative to the central plate, and the connecting plate and the insert plate are sandwiched between the outer plate and the inner plate of the front and rear side portions, a first configuration in which the pressure plates of the left and right sides are overlapped on the pressure plates of the front and rear sides and the left and right sides and secured in place, and a second configuration in which the pressure plates of the front and rear sides are overlapped on the pressure plates of the left and right sides and the engaging protrusions are engaged with the engaging recesses.

2. 2. The packaging box according to claim 1, wherein the engaging protrusions are provided on the left and right sides of the pressure plates of the front and rear side portions, and the engaging recesses are provided between the inner plates and the pressure plates of the left and right side portions.

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