Packing boxes
The packaging box design simplifies assembly by folding panels together with creases and retaining plates, addressing storage and assembly complexity issues of conventional cardboard boxes.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- WAJI CO LTD
- Filing Date
- 2026-04-10
- Publication Date
- 2026-06-26
Smart Images
Figure 0003256375000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a packaging box that is easy to assemble.
Background Art
[0002] Conventionally, front and rear side plates each consisting of an inner plate and an outer plate are continuously provided on the opposing front and rear sides of a square bottom plate, and left and right side plates each consisting of an inner plate and an outer plate are continuously provided on the opposing left and right sides of the bottom plate. A overlapping piece is continuously provided at the lower side portion of each inner plate, and insertion flaps are continuously provided on both side portions of the inner plates of the left and right side plates. The front and rear side plates and the left and right side plates are erected with respect to the bottom plate, the insertion flaps are sandwiched between the inner plate and the outer plate of the front and rear side plates, and both end portions of the overlapping piece of the front and rear side plates are pressed by either or both of both end portions of the overlapping piece of the left and right side plates or the lower side portion of the left and right side plates, whereby a cardboard box in which the box form is maintained is known. This cardboard box is stored in the state of a cardboard box development form formed by punching out cardboard, and is folded at each fold line and assembled into a box during use (see Patent Document 1).
Prior Art Documents
Patent Documents
Patent Document 1
[0003] However, in the state of the cardboard box development form, a large storage space is required, and a large working space must also be taken during assembly. In addition, the operation of folding each fold line is complicated and takes time for assembly, and skill is required to assemble the cardboard box beautifully.
Summary of the Invention
Problems 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, is easy to assemble, and can be assembled beautifully.
Means for Solving the Problems
[0005] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.
[0006] The first invention is a packaging box characterized by the fact that the outer and inner plates of the outer
[0007] The second invention is a packaging box characterized by the following: a rectangular central plate is provided with front and rear side plates consisting of an inner plate and an outer plate on the opposing front and rear edges, left and right side plates consisting of an inner plate and an outer plate on the opposing left and right edges of the central plate, insert plates on both sides of the inner plates of the left and right side plates, and connecting plates continuous with the side edges of the outer plates of the adjacent front and rear side plates and the side edges of the outer plates of the left and right side plates, each provided via fold lines; the front and rear side plates and left and right side plates are erected relative to the central plate by folding along the fold lines, and the insert plates and connecting plates are sandwiched between the inner and outer plates of the front and rear side plates; the packaging box is characterized by the following: a crease is made in the fold line between the central plate and the outer plates of the front and rear side plates and / or the fold line between the outer and inner plates of the front and rear side plates, and the left and right side plates are folded onto the central plate to form a primary assembly.
[0008] The third invention is a packaging box characterized by the following: a rectangular central plate is provided with front and rear side plates consisting of an inner plate and an outer plate on the opposing front and rear edges, left and right side plates consisting of an inner plate and an outer plate on the opposing left and right edges of the central plate, insert plates on both sides of the inner plates of the left and right side plates, and connecting plates continuous with the side edges of the outer plates of the adjacent front and rear side plates and the side edges of the outer plates of the left and right side plates, each provided via fold lines; the front and rear side plates and left and right side plates are erected relative to the central plate by folding along the fold lines, and the insert plates and connecting plates are sandwiched between the inner and outer plates of the front and rear side plates; a crease is made in the fold lines between the central plate and the outer plates of the front and rear side plates, the left and right side plates are folded onto the central plate, and the outer and inner plates of the front and rear side plates are folded onto each other to form a primary assembly.
[0009] In the fourth invention, a rectangular central plate is provided with front and rear side plates consisting of an inner plate and an outer plate on the opposing front and rear edges, left and right side plates consisting of an inner plate and an outer plate on the opposing left and right edges of the central plate, front and rear upper plates between the inner and outer plates of the front and rear side plates, left and right upper plates between the inner and outer plates of the left and right side plates, insert plates on both sides of the inner plates of the left and right side plates, and connecting plates continuous with the side edges of the outer plates of adjacent front and rear side plates and the side edges of the outer plates of the left and right side plates, each provided via a fold line, the front and rear side plates and left and right side plates are erected relative to the central plate by folding the fold lines, and the insert plates and connecting plates are sandwiched between the inner and outer plates of the front and rear side plates, in a packaging box, This packaging box is characterized by creating a crease in either the fold line between the outer panels of the left and right side panels and the left and right upper panels, or the fold line between the inner panels of the left and right side panels and the left and right upper panels, and then folding the other fold line to fold the outer and inner panels of the left and right side panels together to form a primary assembly.
[0010] The fifth invention provides a packaging box comprising: front and rear side panels consisting of an inner panel and an outer panel on the 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 the opposing left and right edges 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 plates on both sides of the inner panels of the left and right side panels; and connecting plates continuous with the side edges of the outer panels of adjacent front and rear side panels and the side edges of the outer panels of the left and right side panels, each provided via fold lines; the front and rear side panels and left and right side panels are erected relative to the central panel by folding along the fold lines, and the insert plates and connecting plates are sandwiched between the inner and outer panels of the front and rear side panels. This packaging box is characterized by creating a crease in one of the fold lines, either the fold line between the outer plate of the front and rear side plate and the front and rear top plate, or the fold line between the inner plate of the front and rear side plate and the front and rear top plate, bending the other fold line, and then folding the outer plate and inner plate of the front and rear side plate together to form a primary assembly.
[0011] The sixth invention is a packaging box that is a reproduction of the fourth or fifth invention, wherein a retaining plate is provided on 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 plates when the packaging box is assembled, thereby restricting the swinging of the front and rear side plates. [Effects of the Invention]
[0012] The present invention has the following effects:
[0013] According to the first design, the outer and inner panels of the left and right side panels are folded together to form a primary assembly, allowing for compact storage. Furthermore, since the final assembly work begins from this state, less workspace is required. Additionally, because the fold lines between the central panel and the outer panels of the left and right side panels, and / or between the central panel and the outer panels of the front and rear side panels, are creased to form the primary assembly, it becomes easier to erect the front and rear side panels and / or the left and right side panels from the central panel, resulting in a simple, easy, and aesthetically pleasing final assembly.
[0014] According to the second design, the left and right side panels are folded onto the central panel to form a primary assembly, making it easier to raise the left and right side panels during the final assembly process. Furthermore, it can be stored compactly, and since the final assembly can be started from this state, less workspace is required. Additionally, because the fold lines between the central panel and the outer panels of the front and rear side panels, and / or between the outer and inner panels of the front and rear side panels, are creased to form a primary assembly, it becomes easier to fold the outer and inner panels of the front and rear side panels, and / or to raise the outer panels of the front and rear side panels from the central panel, resulting in a simpler and more aesthetically pleasing final assembly.
[0015] According to the third design, the left and right side panels are folded onto the central panel to form a primary assembly, making it easier to erect the left and right side panels during the final assembly process. Furthermore, it can be stored compactly, and since the final assembly can be started from this state, less workspace is required. Additionally, because the outer and inner panels of the front and rear side panels are stacked to form a primary assembly, it is easier to raise the front and rear side panels from the central panel, resulting in a simpler and more aesthetically pleasing final assembly.
[0016] According to the fourth invention, since the outer and inner panels of the left and right side panels are folded together to form a primary assembly, the process of erecting the left and right side panels from the central panel during the final assembly is made easier. Furthermore, it can be stored compactly, and since the final assembly can be started from this state, less workspace is required. In addition, in a packaging box with a top panel, a crease is made in the fold line between the outer panels of the left and right side panels and the left and right top panels, or 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 together the outer and inner panels of the left and right side panels to form a primary assembly. As a result, even a top panel that is narrow and difficult to fold can be easily formed, making the final assembly process easy and resulting in a beautifully assembled product.
[0017] According to the fifth invention, since the outer plates and inner plates of the front and rear side plates are folded over to form a primary assembled product, the operation of erecting the front and rear side plates from the center plate during the final assembly operation becomes easy. Also, it can be stored compactly, and since the final assembly operation is started from this state, less working space is required. Further, in a packaging box having an upper plate, a crease is formed in either one of the fold lines between the outer plates of the front and rear side plates and the front and rear upper plates or the fold lines between the inner plates of the front and rear side plates and the front and rear upper plates, and the other fold line is bent, and the outer plates and inner plates of the front and rear side plates are folded over to form a primary assembled product. Therefore, even an upper plate with a narrow width and difficult to bend can be easily formed, and the final assembly operation can be easily and beautifully assembled.
[0018] According to the sixth invention, in addition to the effects of the fourth and fifth inventions, in the state where the assembly of the packaging box is completed, the holding plate contacts the inner plates of the front and rear side plates and restricts the swinging of the front and rear side plates and the left and right side plates. Therefore, the final assembly operation can be easily and simply and beautifully assembled.
[0019]
Brief Description of the Drawings
[0020] [Figure 1] A plan view showing the developed body 2 of the packaging box 1 of the first embodiment. [Figure 2] A perspective simplified view showing the production process of the primary assembled product of the packaging box 1 of the first embodiment. [Figure 3] A perspective simplified view showing the primary assembled product of the packaging box 1 of the first embodiment. [Figure 4] A perspective simplified view showing the final assembly process of the packaging box 1 of the first embodiment. [Figure 5] A plan view showing the developed body 4 of the packaging box 3 of the second embodiment. [Figure 6] A perspective simplified view showing the production process of the primary assembled product of the packaging box 3 of the second embodiment. [Figure 7] A perspective simplified view showing the production process of the primary assembled product of the packaging box 3 of the second embodiment. [Figure 8] A perspective simplified view showing the primary assembled product of the packaging box 3 of the second embodiment. [Figure 9] Perspective simplified view showing the final assembly process of the packaging box 3 of the second embodiment. [Figure 10] Partially enlarged perspective simplified view of the packaging box 3 of the second embodiment.
Mode for Carrying Out the Invention
[0021] Next, embodiments of the present invention will be described using the first embodiment and the second embodiment as examples. The primary assembled product in the present embodiment refers to a form in which a developed body for creating a packaging box is processed and transported and stored, and the final assembly refers to a form in which it is finally assembled from the primary processed product when using the packaging box. In addition, the fold line in the present embodiment refers to a streak-like portion provided for bending the developed body, and examples include a ruled line, a cutting line, a sewing line, etc. In addition, the fold mark in the present embodiment means processing so that it is easy to bend when bending the fold line portion once and then returning it to a flat state and bending the same location again. Hereinafter, for the sake of explanation, the short sides of the central plate 12 are the front and rear sides, and the long sides of the central plate 12 are the left and right sides. Also, in the vertical direction, when the packaging box is assembled and placed with the central plate 12 facing down, the central plate 12 side is the lower side and the opening side is the upper side. First Embodiment
[0022] The packaging box 1 according to the 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 developed 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 cardboard or corrugated cardboard. Note that the front side of the paper surface of the developed body shown in FIG. 1 is shown as the inner surface side of the box.
[0023] The developed body 2 will be described. The central plate 12 of the developed body 2 is a rectangular flat plate portion. In the present embodiment, the central plate 12 is rectangular, but the central plate 12 may be square.
[0024] First, front and rear side plates 13, each consisting of a first inner plate 22 and a first outer plate 21, are attached to the front and rear edges of the central plate 12. The first outer plate 21 is attached to the front and rear edges of the central plate 12 via fold lines, and the first inner plate 22 is attached to the first outer plate 21 via fold lines. On the side of the first inner plate 22 opposite to the side where the first outer plate 21 is attached, the first overlapping plate 24 is attached via a fold line. Protrusions 26 are formed on both sides of the first inner plate 22 and the first overlapping plate 24. The protrusions 26 are parts that, when the packaging box 1 is assembled, are inserted into insertion recesses 37 (described later) to hold the box upright.
[0025] Left and right side plates 14, each consisting of a second inner plate 32 and a second outer plate 31, are attached to the left and right sides of the central plate 12. The second outer plate 31 is attached to the left and right sides of the central plate 12 via fold lines, and the second inner plate 32 is attached to the second outer plate 31 via fold lines. On the side of the second inner plate 32 opposite to the side where the second outer plate 31 is attached, a second overlapping plate 34 is attached to the second inner plate 32 via a fold line. Insertion recesses 37 are formed on both sides of the second overlapping plate 34. Insertion plates 35 are attached 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 by a connecting plate 36 via a fold line. The connecting plate 36 has a fold line formed in the diagonal direction, and is designed so that when the first outer plate 21 and the second outer plate 31 are erected against the central plate 12, the connecting plate 36 is folded in half.
[0027] Next, we will explain the process of making the unfolded body 2 into a primary assembly. First, the fold lines between the central plate 12 and the first outer plate 21, and between the second outer plate 31 and the connecting plate 36, are folded inward and then returned to their original flat state to form creases. The second overlapping 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 overlapping plate 34 are folded together and overlapped.
[0028] Then, as shown in Figure 2, the fold line between the second outer plate 31 and the second inner plate 32 is folded inward, and the inner surfaces of the second outer plate 31 and the second inner plate 32 are folded together and overlapped. The inner surfaces of the insert plate 35 and the connecting plate 36 are also folded together and overlapped. The left and right side plates 14 and the second overlapping plate 34 are folded inward along the fold lines between the central plate 12 and the second outer plate 31, and between the first outer plate 21 and the connecting plate 36, and overlapped onto the central plate 12. The insert plate 35 and the connecting plate 36 are then placed on the inner surface of the first outer plate 21. The inner surface of the second overlapping plate 34 and the inner surface of the central plate 12 are then fixed together with adhesive. In this embodiment, the inner surface of the second overlapping plate 34 and the inner surface of the central plate 12 are fixed together, but the effects of this invention can be achieved even without fixing them together. Alternatively, the inner surface of the first outer plate 21 and the inner surface of the connecting plate 36 on the side connected to the first outer plate 21 may be fixed together with adhesive or the like. In this configuration, when the left and right side panels 14 are erected from the central panel 12, the first outer panel 21 is also erected from the central panel 12 in conjunction with them, making assembly easier.
[0029] Then, as shown in Figure 3, the fold line between the first outer plate 21 and the first inner plate 22 is folded inward, overlapping the inner surfaces of the first outer plate 21 and the first inner plate 22. At this time, the insert plate 35 and the connecting plate 36 are positioned between the first outer plate 21 and the first inner plate 22. In this way, the primary assembly is completed. It is transported and stored in this state, and final assembly is performed when it is ready for use.
[0030] Next, the process of finally assembling the above-mentioned primary assemblers to create the finished product will be explained using Figure 4. First, the left and right side plates 14 are erected from the central plate 12. Then, the connecting plate 36 is folded in half along 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 bent to erect the front and rear side plates 13 from the central plate 12. At this point, the fold line has been creased, so it 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 bent at an angle, the inner surface of the first overlapping plate 24 and the inner surface of the central plate 12 are overlapped, and the protruding part 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 an erect position. In this way, the final assembly is completed.
[0031] As described above, the packaging box 1 of this embodiment has front and rear side panels 13 consisting of a first inner panel 22 and a first outer panel 21 on the opposing front and rear sides of a rectangular central panel 12, left and right side panels consisting of a second inner panel 32 and a second outer panel 31 on the opposing left and right sides of the central panel 12, insert plates 35 on both sides of the second inner panel 32 of the left and right side panels, and connecting plates 36 that are continuous with the side edges of the first outer panel 21 of adjacent front and rear side panels 13 and the side edges of the second outer panel 31 of left and right side panels 14, all connected via fold lines, and the fold lines are folded. A packaging box 1 is formed by bending the central plate 12 to erect the front and rear side plates 13 and the left and right side plates 14, and sandwiching the insert plate 35 and the connecting plate 36 between the first inner plate 22 and the first outer plate 21 of the front and rear side plates 13. A crease is made in the fold line between the central plate 12 and the first outer plate 21 of the front and rear side plates 13, the second outer plate 31 and the second inner plate 32 of the left and right side plates 14 are folded on top of each other, the left and right side plates 14 are folded on top of the central plate 12, and the first outer plate 21 and the first inner plate 22 of the front and rear side plates 13 are folded on top of each other 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 simply by erecting the folded left and right side panels 14 from the central panel 12. Furthermore, since the first outer panel 21 and the first inner panel 22 of the front and rear side panels 13 are folded together, and a crease is created along 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, because the creases are already present in the initial assembly, there is no risk of folding errors, allowing for easy and beautiful assembly. Moreover, since the left and right side panels 14 are folded onto the central panel 12 and the first inner panel 22 is folded onto the first outer panel 21, it can be stored compactly, eliminating the need for a large workspace. Second Embodiment
[0033] Next, the packaging box 3 according to the second embodiment of the present invention will be described with reference to Figures 5 to 10. In the second embodiment, the packaging box 3 differs significantly from the first embodiment in that it has front and rear upper plates 23, left and right upper plates 33, a retaining plate 41, and a protruding portion 25. A detailed description of the parts that are the same as in the first embodiment will be omitted.
[0034] The packaging box 3 according to the second embodiment is formed by assembling the unfolded body 4 shown in Figure 5. Let's explain the expanded form 4. Between the first outer plate 21 and the first inner plate 22 of the unfolded body 4, front and rear upper plates 23 are formed via fold lines, and between the second outer plate 31 and the second inner plate 32, left and right upper plates 33 are formed via fold lines. In the final assembled state, the front and rear upper plates 23 form upper plates connecting the upper end of the first outer plate 21 and 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 and the upper end of the second inner plate 32, forming a frame-like opening.
[0035] Furthermore, a retaining plate 41 is attached via a fold line to the free end edge of the connecting plate 36 on the side that is 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 by a wide portion, from the fold line at its base end to the free end edge, which has a width 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 that is narrower than this width.
[0036] Furthermore, a protruding portion 25 is formed by cutting the first inner plate 22 into a roughly U-shape, with the base end being near the fold line between the first inner plate 22 and the first overlapping plate 24. The width of the protruding portion 25 from the base end, which is connected to the first overlapping plate 24, to the free end, is the same width 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. Also, a protruding portion 25 is formed by cutting the second inner plate 32 into a roughly U-shape, with the base end being near the fold line between the second inner plate 32 and the second overlapping plate 34. The width of the protruding portion 25 from the base end, which is connected to the second overlapping plate 34, to the free end, is the same width 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 remaining parts are the same as those of the unfolded body 2 of the first embodiment, so their explanation will be omitted.
[0037] Next, the process of making the unfolded body 4 a primary assembly will be explained using Figures 6 to 8. First, the fold lines between the central plate 12 and the first outer plate 21, and the fold lines between the second outer plate 31 and the connecting plate 36 are folded inward, and then returned to their original flat state to create creases.
[0038] Furthermore, the fold line between the second outer plate 31 and the left and right upper plates 33 is folded inward, and the inner surface of the second outer plate 31 is folded and overlapped with the inner surfaces of the left and right upper plates 33 and the inner surface of the second inner plate 32. Also, the inner surface of the insertion plate 35 is overlapped with the inner surface of the connecting plate 36. Finally, the inner surface of the second overlapping plate 34 is overlapped with the inner surface of the central plate 12. This state is shown in Figure 6.
[0039] Then, as shown in Figure 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 folded inward, the left and right side plates 14 are folded onto the central plate 12, and the outer surface of the insertion plate 35 and the inner surface of the connecting plate 36 are placed on top of the inner surface of the first outer plate 21. At this point, the fold lines between the second inner plate 32 and the left and right upper plates 33 are folded, and the second inner plate 32 and the left and right upper plates 33 are folded together. Also, the folded second outer plate 31 and the left and right upper plates 33 unfold and become flat, and the fold lines between the second outer plate 31 and the left and right upper plates 33 are left with creases.
[0040] At this time, the fold line between the second inner plate 32 and the second overlapping plate 34 also bends, causing the outer surfaces of the second inner plate 32 and the second overlapping plate 34 to overlap, and a protruding portion 25 is formed by the roughly 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, 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 and then returned to its original flat state to create a crease. Then, as shown in Figure 8, the fold line between the first outer plate 21 and the front and rear upper plates 23 is folded inward, and the inner surface of the first outer plate 21, the inner surfaces of the front and rear upper plates 23 and the inner surface of the first inner plate 22 are folded together. At this time, the insertion plate 35, the connecting plate 36, and the holding plate 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, creases are created on the fold line between the central plate 12 and the first outer plate 21, the fold line between the second outer plate 31 and the connecting plate 36, the fold line between the second outer plate 31 and the left and right upper plates 33, and the fold line between the front and rear upper plates 23 and the first inner plate 22.
[0042] Next, the process of finally assembling the above-mentioned primary assemblers to create the finished product will be explained using Figure 9. First, the left and right side plates 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 shape, and the fold line between the second outer plate 31 and the left and right upper plates 33 is bent, so that the second outer plate 31 and the left and right upper plates 33 are formed in an angle shape, and the left and right upper plates 33 are formed. At this time, the fold line between the second outer plate 31 and the left and right upper plates 33 has a crease, so it bends easily. The free end of the protrusion 25 abuts against the inner surface of the second outer plate 31, maintaining the space between the second outer plate 32 and the second inner plate 31.
[0043] Next, the connecting plate 36 is folded along the fold line, and the insert 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 to erect the front and rear side plates 13 from the central plate 12. At this time, the fold line between the central plate 12 and the first outer plate 21 has a crease, so it can be easily erected. Then, the folded first outer plate 21 and the front and rear upper plates 23 are unfolded to form an angle, and the fold line between the front and rear upper plates 23 and the first inner plate 22 is folded at an angle to form the front and rear upper plates. At this time, the fold line between the front and rear upper plates 23 and the first inner plate 22 has a crease, so it can be easily folded.
[0044] Furthermore, the fold line between the first inner plate 22 and the first overlapping plate 24 is bent into an angle shape. At this time, the free end of the protrusion 25 abuts against the inner surface of the first outer plate 21, positioning the second inner plate 32 upright. Then, the inner surface of the first overlapping plate 24 and the inner surface of the central plate 12 are overlapped, and the protrusion 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 upright, 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 outwards from the box and maintaining their upright position. Here, for example, if the opposing insert plates 35 are further extended and their free ends are locked together, the upright position of the front and rear side plates 13 and the left and right side plates 14 can be held more firmly. However, when the folding process is performed by machine, the long insert plates get in the way, the work of locking the insert plates together in the final assembly process is complicated, and there are cases where the insert plates have to be shortened due to the constraints of cutting the cardboard. In this embodiment, in order to firmly hold the front and rear side plates 13 and left and right side plates 14 upright even with short insert plates, a retaining plate 41 is attached to the connecting plate 36. The retaining plate 41 is bent toward the first inner plate 22 and is located below the front and rear upper plates 23. The free end of the wide portion of the retaining plate 41 (the portion whose width from the fold line as the base end to the free end is formed to be approximately the same width as 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) abuts against the inner surface of the first inner plate 22, preventing the front and rear side plates 13 and left and right side plates 14 from swinging and opening outward from the box, and firmly holding the front and rear side plates 13 and left and right side plates 14 upright.
[0046] Furthermore, in this embodiment, the retaining plate 41 is provided with a narrow portion (a portion where the width from the fold line as the base edge to the free edge is narrower than the wide portion). When retaining plates 41 are connected in series as in this embodiment, the space between the insertion plate 35 and the retaining plate 41 becomes narrow when the unfolded body 3 is in its unfolded state, making it difficult to punch out the shape of the unfolded body 3 from the cardboard. Therefore, by forming a narrow portion on the retaining plate 41, the formation of the unfolded body 4 is made easier without impairing the effect of the retaining plate 41.
[0047] As described above, the packaging box 3 of this embodiment has front and rear side panels 13 consisting of a first inner panel 22 and a first outer panel 21 on the opposing front and rear sides of a rectangular central panel 12, left and right side panels 14 consisting of a second inner panel 32 and a 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 that are continuous with the side of the first outer panel 21 of the adjacent front and rear side panels 13 and the side of the second outer panel 31 of the left and right side panels 14, all connected via fold lines, and the fold lines are folded to form the box. The packaging box 3 has front and rear side panels 13 and left and right side panels 14 erected on a central panel 12, and an insertion panel 35 and a connecting panel 36 are sandwiched between the first inner panel 22 and the first outer panel 21 of the front and rear side panels 13. A crease 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, and 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 bent to overlap the second outer panel 31 and the second inner panel 32 of the left and right side panels 14. A crease 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, and 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 bent to overlap the first outer panel 21 and the first inner panel 22 of the front and rear side panels 13. Furthermore, a retaining plate 41 is connected to the free end of the connecting plate 36 via a fold line, and when the packaging box 3 is assembled, 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.
[0048] Therefore, in the final assembly, the second outer panel 31 and the second inner panel 32 can be easily erected simply by 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 on top of each other, and a crease is made at the fold line between the central panel 12 and the first outer panel 21, so the front and rear side panels 13 can also be easily erected, making assembly easy. Furthermore, since the fold lines between the second outer panel 31 of the left and right side panels 14 and the left and right upper panels 33, and the fold lines between the first inner panel 22 and the front and rear upper panels 23 of the front and rear side panels 13 are creased to create a primary assembly, even the top panels, which are narrow and difficult to fold, can be assembled easily and beautifully without making mistakes. Moreover, since the left and right side panels 14 are folded on top of the central panel 12 and the first inner panel 22 is folded on top of the first outer panel 21, it can be stored compactly and does not require a large workspace. Furthermore, when the final assembly of the packaging box 3 is complete, the retaining plate 41 contacts the first inner plate 22 of the front and rear side plates 13, restricting the swinging of the front and rear side plates 13. Therefore, assembly is easy, simple, and aesthetically pleasing.
[0049] Although embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, in addition to the creases applied in these embodiments, creases may also be applied to the fold lines between the first inner plate 22 and the first overlapping plate 24. Furthermore, in the second embodiment, the retaining plate 41 is connected to the free end 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 of the connecting plate 36 on the side connected to the first outer plate 21.
[0050] The technical scope of this invention broadly extends to the entire range of the technical idea that the invention truly intends, as will become clear from the matters described herein and in the drawings. [Explanation of Symbols]
[0051] 1 Packaging box 2 Expansion 3 Packaging box 4. Expansion 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 top boards 24. First polymerization plate 25 Protrusion 26 Protrusion 31 Second outer plate 32 Second inner plate 33 Upper left and right plates 34. Second Polymerization Plate 35 Insertion plate 36 Connecting plate 37 Insertion recess 41 Holding plate
Claims
1. The rectangular central plate is provided with front and rear side plates consisting of an inner plate and an outer plate on the opposing front and rear edges, left and right side plates consisting of an inner plate and an outer plate on the opposing left and right edges of the central plate, insert plates on both sides of the inner plates of the left and right side plates, and connecting plates that are continuous with the side edges of the outer plates of adjacent front and rear side plates and the side edges of the outer plates of the left and right side plates, each provided via a fold line. A packaging box in which the aforementioned fold lines are bent to erect the front and rear side panels and left and right side panels relative to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner and outer panels of the front and rear side panels, A packaging box characterized by folding the outer and inner panels of the left and right side panels together, and creating creases along the fold lines between the central panel and the outer panels of the left and right side panels, and / or between the central panel and the outer panels of the front and rear side panels, to form a primary assembly.
2. The rectangular central plate is provided with front and rear side plates consisting of an inner plate and an outer plate on the opposing front and rear edges, left and right side plates consisting of an inner plate and an outer plate on the opposing left and right edges of the central plate, insert plates on both sides of the inner plates of the left and right side plates, and connecting plates that are continuous with the side edges of the outer plates of adjacent front and rear side plates and the side edges of the outer plates of the left and right side plates, each provided via a fold line. A packaging box in which the aforementioned fold lines are bent to erect the front and rear side panels and left and right side panels relative to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner and outer panels of the front and rear side panels, A packaging box characterized by creating a crease in the fold line between the central plate and the outer plates of the front and rear side plates, and / or the fold line between the outer plates and inner plates of the front and rear side plates, and then folding the left and right side plates onto the central plate to form a primary assembly.
3. The rectangular central plate is provided with front and rear side plates consisting of an inner plate and an outer plate on the opposing front and rear edges, left and right side plates consisting of an inner plate and an outer plate on the opposing left and right edges of the central plate, insert plates on both sides of the inner plates of the left and right side plates, and connecting plates that are continuous with the side edges of the outer plates of adjacent front and rear side plates and the side edges of the outer plates of the left and right side plates, each provided via a fold line. A packaging box in which the aforementioned fold lines are bent to erect the front and rear side panels and left and right side panels relative to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner and outer panels of the front and rear side panels, A packaging box characterized by forming a crease along the fold line between the central plate and the outer plates of the front and rear side plates, folding the left and right side plates onto the central plate, and folding the outer and inner plates of the front and rear side plates onto each other to form a primary assembly.
4. The central rectangular plate is provided with front and rear side plates consisting of an inner plate and an outer plate on the opposing front and rear edges, left and right side plates consisting of an inner plate and an outer plate on the opposing left and right edges of the central plate, front and rear upper plates between the inner and outer plates of the front and rear side plates, left and right upper plates between the inner and outer plates of the left and right side plates, insert plates on both sides of the inner plates of the left and right side plates, and connecting plates that are continuous with the side edges of the outer plates of adjacent front and rear side plates and the side edges of the outer plates of the left and right side plates, each provided via a fold line. A packaging box in which the aforementioned fold lines are bent to erect the front and rear side panels and left and right side panels relative to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner and outer panels of the front and rear side panels, A packaging box characterized by forming a crease in either the fold line between the outer panels of the left and right side panels and the left and right upper panels, or the fold line between the inner panels of the left and right side panels and the left and right upper panels, and folding the other fold line to fold the outer and inner panels of the left and right side panels together to form a primary assembly.
5. The central rectangular plate is provided with front and rear side plates consisting of an inner plate and an outer plate on the opposing front and rear edges, left and right side plates consisting of an inner plate and an outer plate on the opposing left and right edges of the central plate, front and rear upper plates between the inner and outer plates of the front and rear side plates, left and right upper plates between the inner and outer plates of the left and right side plates, insert plates on both sides of the inner plates of the left and right side plates, and connecting plates that are continuous with the side edges of the outer plates of adjacent front and rear side plates and the side edges of the outer plates of the left and right side plates, each provided via a fold line. A packaging box in which the aforementioned fold lines are bent to erect the front and rear side panels and left and right side panels relative to the central panel, and the insertion panel and the connecting panel are sandwiched between the inner and outer panels of the front and rear side panels, A packaging box characterized by forming a crease in either the fold line between the outer plate of the front and rear side plate and the front and rear top plate, or the fold line between the inner plate of the front and rear side plate and the front and rear top plate, bending the other fold line, and folding the outer plate and inner plate of the front and rear side plate together to form a primary assembly.
6. The packaging box according to claim 4 or claim 5, wherein a retaining plate is provided at the free end of the connecting plate via a fold line, and the retaining plate, when the packaging box is assembled, contacts the inner plates of the front and rear side plates to restrict the swinging of the front and rear side plates.