Packaging box

Abstract

To provide a packaging box which can be easily assembled from primary assembly to final assembly. [Solution] A rectangular bottom plate 11 has a pair of first side portions facing each other on one side and a pair of second side portions facing each other on the other side, and a connecting plate between the first and second side portions, and at least the first side portion has an outer plate, an inner plate 14, an upper edge plate 15, a pressure plate 16, and a spacer piece 18 formed by cutting into the inner plate, and the second side portion is overlapped on the bottom plate, the connecting plate is overlapped on the inner surface of the outer plate of the first side portion, and the inner plate is overlapped on the outer plate and connecting plate of the first side portion to form a primary assembly, and in the primary assembly state, the spacer piece of the first side portion is positioned only on the bottom plate or the outer plate.

Description

Technical Field

[0001] The present invention relates to a packaging box that is easy to finally assemble from primary assembled parts.

Background Art

[0002] Conventional cardboard boxes are, for example, of an assembled type having a square bottom plate, and double-walled front, rear, left, and right side plates composed of outer walls, strip-shaped edges, inner walls, and overlapping portions successively connected outward from the four sides thereof, and connecting pieces that are connected from the outer walls of the side plates and connect adjacent side plate outer walls to each other. A plurality of substantially U-shaped cuts are provided from the fold between a pair of opposing side plate inner walls and the side plate overlapping portion in the direction of the side plate inner wall. The tongue-shaped pieces (spacer pieces) formed by the cuts are attached to the bottom plate together with the side plate overlapping portion with their tips abutting on the fold between the side plate outer wall and the bottom plate. It is known that a part of the connecting piece is attached to the inner side of the outer walls of the other pair of side plates. In this cardboard box, since a part of the connecting piece connected from the left and right side plates is attached to the inner side of the outer walls of the front and rear side plates, when the left and right side plates are erected from the folded state of the cardboard box, the front and rear side plates also automatically stand up. When the front and rear side plates of the cardboard box are folded at each fold from the unfolded state and rolled into the inside of the cardboard box, the tip of the overlapping portion engages with the tip of the overlapping portion of the left and right side plates, and the front and rear side plates are fixed. In this cardboard box, the tongue-shaped pieces (spacer pieces) prevent the inner wall and the overlapping portion from moving outward in the direction of the cardboard box by abutting on the outer wall at the fold when the overlapping portion is attached to the bottom plate, and further enhance the strength of the left and right side plates during use. In this embodiment, four cuts and tongue-shaped pieces are provided per side plate, but as long as the above-described effects are maintained, this can be reduced to two or three places, or conversely increased to five or six places, etc. The number is said to be determined by the balance with the length of the side plate. (See Patent Document 1).

Prior Art Documents

Patent Documents

Patent Document 1

[0003] However, when the length of the tongue-shaped piece (spacer piece) is determined only based on the balance with the length of the side plate, as in the case of the above-mentioned paper box, the tongue-shaped piece (spacer piece) gets in the way when assembling the box, which can be time-consuming. Specifically, when the area between the inner wall and the overlapping part is bent at an angle during the box assembly process, the tongue-shaped piece (spacer piece) cut into an approximately U-shape is released from the inner wall to the opposite side of the tip of the overlapping part, but at this time the tongue-shaped piece (spacer piece) may come into contact with the outer plate or the cover plate and bend, resulting in damage (see Figures 9 and 10). Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made to solve the above problems. The purpose of the present invention is to provide a packaging box having spacer pieces that is easy to assemble from the primary assembly to the final assembly. [Means for solving the problem]

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

[0006] The present invention relates to a packaging box having a pair of first side portions facing each other on one side of a rectangular bottom plate, and a pair of second side portions facing each other on the other side, and a connecting plate between the first and second side portions, wherein at least the first side portion has an outer plate, an inner plate, an upper edge plate, a pressing plate, and a spacer piece formed by cutting into the inner plate, and wherein the second side portion is overlapped on the bottom plate, the connecting plate is overlapped on the inner surface of the outer plate of the first side portion, and the inner plate is overlapped on the outer plate and the connecting plate of the first side portion to form a primary assembly, and wherein in the primary assembly state, the spacer piece of the first side portion is positioned only on the bottom plate or the outer plate of the first side portion. Effect of the Invention

[0007] In the packaging box of the present invention, when assembling from the state of the primary assembled product to the completed state, the final assembly becomes easy without the spacer pieces being damaged.

[0008]

Brief Description of the Drawings

[0009] [Figure 1] Schematic perspective view of the packaging box 1 which is an embodiment of the present invention. [Diagram 2] Plan view showing the developed sheet 2 of the packaging box 1. [Diagram 3] Plan view showing the primary assembled product of the packaging box 1. [Figure 4] Schematic perspective view showing the assembly of the packaging box 1. [Diagram 5] Schematic perspective view showing the assembly of the packaging box 1. [Figure 6] Schematic perspective view showing the packaging box 3 which is another embodiment. [Figure 7] Plan view showing the developed sheet 4 of the packaging box 3. [Figure 8] Plan view showing the primary assembled product of the packaging box 3. [Figure 9] Schematic perspective view showing the assembly of the conventional packaging box. [Figure 10] Plan view showing the developed sheet of the conventional packaging box.

Modes for Carrying Out the Invention

[0010] Next, embodiments of the present invention will be described. First, the primary assembled product in this embodiment refers to the form in which the developed sheet for creating the packaging box is folded and the like and transported and stored. Also, the final assembly refers to the form in which the packaging box is finally assembled from the primary assembled product when the packaging box is used. In addition, the bending part in this embodiment refers to the rib-shaped part attached for folding the developed sheet. Examples of the formation of the bending part include by score lines, cut lines, sewing lines, etc., and are illustrated by broken lines.

[0011] For the sake of explanation, the short sides of the bottom plate 11 are referred to as the front and rear sides, and the long sides of the bottom plate 11 are referred to as the left and right sides. In addition, when the packaging box 1 is assembled and placed with the bottom plate 11 facing down, the top and bottom directions are defined as the bottom side of the bottom plate 11 and the top side of the opening.

[0012] The packaging box 1 can be made of thick paper such as paperboard or corrugated board, but in this embodiment, a paperboard with a thickness of about 0.5 mm is used. The packaging box 1 is formed by assembling the development sheets 2 shown in Fig. 2, and the front side of the page is shown as the inner side of the box.

[0013] As shown in FIG. 1, the packaging box 1 after final assembly is mainly constructed by erecting a pair of first side portions 12 opposing each other on one side of a bottom plate 11 and a pair of second side portions 19 opposing each other on the other side, forming a box main body having an opening at the top, and a cover plate 24 connected to the upper end of an outer plate 20 of the second side portion 19 to close or open the opening. The packaging box 1 of this embodiment is transported and stored in the state of a primary assembly shown in FIG. 3 after folding the development sheet 2 shown in FIG. 2, and is finally assembled into the assembled finished product shown in FIG.

[0014] First, the process up to the formation of the primary assembly of the packing box 1 according to this embodiment will be described with reference to Figs. 1 to 3. The packaging box 1 according to this embodiment is formed by assembling development sheets 2 shown in FIG.

[0015] The development sheet 2 will now be described. The bottom plate 11 of the development sheet 2 is quadrangular, and in this embodiment, the bottom plate 11 is rectangular, but the bottom plate 11 may be square.

[0016] A first side portion 12 is connected to the front and rear sides of the bottom plate 11. The first side portion 12 has an outer plate 13 connected to the front and rear sides of the bottom plate 11 via a bent portion, an upper edge plate 15 connected to the outer plate 13 via a bent portion, an inner plate 14 connected to the upper edge plate 15 on the opposite side of the side where the outer plate 13 is connected via a bent portion, and a pressing plate 16 connected to the inner plate 14 on the opposite side of the side where the upper edge plate 15 is connected via a bent portion. A substantially U-shaped cut 17 is formed near the center of the inner plate 14, with the bent portion between the inner plate 14 and the pressing plate 16 as the base end. The substantially U-shaped portion formed by the cut 17 is released from the inner plate 14 to form a spacer piece 18 in the completed assembly state. The spacer piece 18 is set to have a front-to-rear width that is substantially the same as the front-to-rear width of the upper edge plate 15. In the completed assembled state, the spacer pieces 18 come into contact with the inner surface of the outer panel 13, preventing the inner panel 14 and the pressing panel 16 from moving towards the outer panel 13, maintaining the space between the outer panel 13 and the inner panel 14, and increasing the strength of the box. The position where the spacer pieces 18 are formed will be described later.

[0017] Further, second side portions 19 are connected to the left and right sides of the bottom plate 11 via bent portions. The second side portion 19 on the right side has an outer plate 20 connected to the right side of the bottom plate 11 via a bent portion, and an inner plate 21 connected to the outer plate 20 via a bent portion. The second side portion 19 on the left side has the outer plate 20 connected to the left side of the bottom plate 11 via a bent portion. In addition, a connecting plate 22 is connected between the adjacent outer plates 13 and 20 via a bent portion. A bent portion is formed in the connecting plate 22 in a diagonal direction from a corner of the bottom plate 11. In this embodiment, this bent portion has a curved cut shape near the center, and both end portions are intermittently cut, but it may be a simple perforation line or crease line. The connecting plate 22 is formed so as to be folded and overlapped from the bent portion when the first side portion 12 and the second side portion 19 are erected against the bottom plate 11. In addition, the connecting plate 22 has an adhesive portion on the side adjacent to the outer plate 13. The adhesive portion has a plurality of fine cut lines to allow the adhesive to easily penetrate. Further, a reinforcing piece 23 is connected to the edge of the connecting plate 22 adjacent to the outer plate 20 via a curved bent portion that is convex toward the connecting plate 22 side.

[0018] A cover plate 24 is connected to the left outer plate 20 via a bent portion on the side opposite to the side where the bottom plate 11 is connected. An insertion plate 25 is connected to the cover plate 24 via a bent portion on the side opposite to the side where the outer plate 20 is connected.

[0019] Next, a process for assembling the deployable sheet 2 into a primary assembly will be described. First, the folded portion between the outer plate 20 and the inner plate 21 on the right side of the unfoldable sheet 2 is folded and overlapped, and then fixed with an adhesive or the like. Next, the folded portion between the bottom plate 11 and the outer plate 20, and the folded portion between the outer plate 13 and the connecting plate 22 are folded, and the outer plate 20 and the inner plate 21 (second side portion 12) on the right side are overlapped on the bottom plate 11. In addition, the connecting plate 22 is overlapped on the outer plate 13, and the adhesive portion of the connecting plate 22 and the outer plate 13 are fixed with an adhesive or the like. Furthermore, the bent portion between the bottom plate 11 and the left outer plate 20, and the bent portion between the outer plate 13 and the connecting plate 22 are folded, so that the left outer plate 20 (second side portion 19) is laid on top of the bottom plate 11. Furthermore, the connecting plate 22 is laid on top of the outer plate 13, and the adhesive portion of the connecting plate 22 is fixed to the outer plate 13 with an adhesive or the like. Then, the portion between the left outer plate 20 and the cover plate 24 is folded, so that the cover plate 24 is laid on the outer surface side of the left outer plate 20.

[0020] Then, the bent portion between the outer plate 13 and the upper edge plate 15 is folded, and the inner plate 14 is laid on top of the outer plate 13 and the connecting plate 22. In this way, as shown in Figure 3, the second side portion 19 is overlapped on the bottom plate 11, the connecting plate 22 is overlapped on the inner surface of the outer plate 13 of the first side portion 12, and the outer plate 13 of the first side portion 12 and the connecting plate 22 are overlapped with the inner plate 14, and this overlapping state forms the primary assembly. The spacer piece 18 is positioned so that, in this primary assembly state, it is not disposed on the cover plate 24 or the second side portion 19 but is disposed only on the bottom plate 11 .

[0021] Next, the process of finally assembling the primary assembly of the packaging box 1 to obtain a finished assembled product will be described with reference to Figs. First, it is preferable to fold the pressing plate 16, which is lying down in the primary assembly state, upward in an angle shape. If the outer plate 13 is raised against the bottom plate 11 without first folding the pressing plate 16, the second side portion 19 will also rise against the bottom plate 11 in conjunction with the pressing plate 16 because the connecting plate 22 and the outer plate 13 are fixed to each other, but when the inner plate 14 is finally erected against the bottom plate 11, the left and right ends of the inner plate 14 and the pressing plate 16 may come into contact with the inner surface of the second side portion 19 and bend, resulting in unexpected creases. To prevent this, if the pressing plate 16 is first folded upward in an angle shape, the strength of the inner plate 14 and the pressing plate 16 will increase when the inner plate 14 is finally erected against the bottom plate 11, and unexpected creases can be prevented. Here, when folding the pressure plate 16 upward at an angle from the primary assembled state, if the number and arrangement of the spacer pieces 18 were determined solely based on the balance with the length of the side panels as in the conventional case, for example, if the spacer pieces 218 were arranged evenly in two places in the left-right direction as shown in Figures 9 and 10, when the pressure plate 16 is folded upward at an angle, the spacer pieces 218 will become detached from the inner panel 14 and attempt to protrude in the opposite direction to the pressure plate 16, but the spacer pieces 218 arranged on the left and right sides will be more likely to come into contact with the outer panel 20 and the cover panel 24, and the spacer pieces 218 will be more likely to bend and be damaged. In this embodiment, in the primary assembly state, the spacer pieces 18 are disposed only on the bottom plate 11, so that when the presser plate 16 is folded upward into an angle, the spacer pieces 18 that have become detached from the inner plate 14 and protrude in the opposite direction from the presser plate 16 do not come into contact with the outer plate 20 or the cover plate 24. In addition, because the folded second side portion 19 and cover plate 24 are thicker due to the repulsive force of the paper, a space is likely to form between the bottom plate 11 and the inner plate 14, so that when the presser plate 16 is folded upward into an angle, the spacer pieces 18 that protrude in the opposite direction from the presser plate 16 are less likely to come into contact with the bottom plate 11 and be damaged.

[0022] Therefore, when using the packaging box 1 of this embodiment, the pressing plate 16 can be easily folded upward in an angle shape, and then, when the outer plate 13 is raised relative to the bottom plate 11, the outer plate 20 and the inner plate 21 also rise relative to the bottom plate 11 in conjunction with each other because the connecting plate 22 is fixed to the outer plate 13. Then, the reinforcing plate 23 is bent in an angle shape toward the inside of the box and disposed below the upper edge plate 15, and the bent portion between the inner plate 14 and the upper edge plate 15 is bent to make the inner plate 14 stand relative to the bottom plate 11. Since the bent portion at the base end of the reinforcing plate 23 is curved, the structure is such that the angled position can be easily maintained, and the space between the outer plate 13 and the inner plate 14 is maintained, thereby enhancing the strength of the box. Then, the pressure plate 16, which has been bent into an angle shape, is placed on the bottom plate 11, resulting in the completed assembly state shown in Figure 1. At this time, the tip of the spacer piece 18 that has been released from the inner plate 14 abuts against the inner surface of the outer plate 13, preventing the inner plate 14 and pressure plate 16 from moving toward the outer plate 13, thereby enhancing the strength of the box. In this way, the packaging box 1 of this embodiment has a pair of first side portions 12 facing each other on one side of the rectangular bottom plate 11, a pair of second side portions 19 facing each other on the other side, and a connecting plate 22 between the first side portions 12 and the second side portions 19, and the first side portions 12 have an outer plate 13, an inner plate 14, an upper edge plate 15, a pressure plate 16, and a spacer piece 18 formed by cutting into the inner plate 14. The second side portion 19 has an outer plate 20 and an inner plate 21 . The primary assembly is formed by overlapping the second side portion 19 on the bottom plate 11, overlapping the connecting plate 22 on the inner surface of the outer plate 13 of the first side portion 12, and overlapping the inner plate 14 on the outer plate 13 and connecting plate 22 of the first side portion 12. In the primary assembly state, the spacer piece 18 of the first side portion 12 is disposed only on the bottom plate 11.

[0023] As another embodiment, for example, there is a packaging box 3 shown in FIG. The packaging box 3 is transported and stored in the state of a primary assembly shown in FIG. 8 by folding the development sheet 4 shown in FIG. 7, and is finally assembled into the assembled finished product shown in FIG. Description of parts similar to those of the packaging box 1 will be omitted.

[0024] This packaging box 3 is composed of a box body portion shown in FIG. 6 and a covering lid portion (not shown) provided separately. A first side portion 12 is connected to the front and rear sides of the rectangular bottom plate 11 of the spread sheet 4. The first side portion 12 is connected to the front and rear sides of the bottom plate 11 via a bent portion with an outer plate 13, and an upper edge plate 15 is connected to the outer plate 13 via a bent portion. The inner plate 14 is connected to the upper edge plate 15 on the opposite side to the side to which the outer plate 13 is connected via a bent portion. The inner plate 14 is connected to the inner edge plate 15 on the opposite side to the side to which the upper edge plate 15 is connected via a bent portion with a pressing plate 16. Two approximately U-shaped notches 17 are formed near the center of the inner plate 14, with the bent portion between the inner plate 14 and the pressing plate 16 as the base end. The approximately U-shaped portions formed by the notches 17 are released from the inner plate 14 to form spacer pieces 18 in the completed assembly state. The spacer pieces 18 are set to have a front-to-rear width that is approximately the same as the front-to-rear width of the upper edge plate 15. The position where the spacer pieces 18 are formed will be described later.

[0025] Further, second side portions 119 are connected to the left and right sides of the bottom plate 11 via bent portions. In the second side portion 119, an outer plate 120 is connected to the left and right sides of the bottom plate 11 via a bent portion, and an upper edge plate 115 is connected to the outer plate 120 via a bent portion. An inner plate 121 is connected to the upper edge plate 115 on the opposite side to the side to which the outer plate 120 is connected via a bent portion. A pressing plate 116 is connected to the inner plate 121 on the opposite side to the side to which the upper edge plate 115 is connected via a bent portion. Three substantially U-shaped notches 117 are formed in the inner plate 121, with the bent portion between the inner plate 121 and the pressing plate 116 as the base end. The substantially U-shaped portions formed by the notches 117 are released from the inner plate 121 in the completed assembly state to form spacer pieces 118. Additionally, flap plates are connected to the front and rear sides of the inner plate 121 via bent portions.

[0026] To make the deployable sheet 4 into a primary assembly, first, the bent portion between the inner plate 121 and the pressing plate 116 is folded to overlap the outer surface of the inner plate 121 with the outer surface of the pressing plate 116. At this time, the spacer piece 118 is released from the inner plate 121 and protrudes in the opposite direction to the pressing plate 116. Next, the bent portion between the upper edge plate 115 and the inner plate 121 is folded to overlap the inner plate 121 and the outer plate 120. Then, the portion between the bottom plate 11 and the outer plate 120 is folded to overlap the second side portion 119 on the bottom plate 11, and the pressing plate 116 and the bottom plate 11 are fixed with an adhesive or the like. The bent portion between the outer plate 13 and the connecting plate 22 is folded to overlap the connecting plate 22 on the outer plate 13, and the adhesive portion of the connecting plate 22 and the outer plate 13 are fixed with an adhesive or the like. Then, the bent portion between the inner plate 14 and the upper edge plate 15 is folded, and the inner plate 14 is laid on top of the outer plate 13 and the connecting plate 22. In this manner, the packaging box 3 is primarily assembled in a state in which the second side portion 119 is placed on the bottom plate 11, the connecting plate 22 is placed on the inner surface of the outer plate 13 of the first side portion 12, and the inner plate 14 is placed on the outer plate 13 and the connecting plate 22. The packaging box 3 differs from the packaging box 1 in that the spacer piece 18 is disposed only on the outer plate 13 in this primarily assembled state.

[0027] To finally assemble the primary assembly of the packaging box 3 into a completed assembled product, first, the pressing plate 16 is folded into an angle shape, and then the outer plate 13 is raised up against the bottom plate 11, and the second side portion 119 also rises up against the bottom plate 11 in conjunction with the connecting plate 22 fixed to the outer plate 120. Then, the bent portion between the outer plate 13 and the upper edge plate 15 is folded, the inner plate 14 is set up against the bottom plate 11, and the pressing plate 16 is placed on the bottom plate 11, resulting in the completed assembled state shown in FIG. At this time, the tip of the spacer piece 18 that has become detached from the inner plate 14 abuts against the inner surface of the outer plate 13, preventing the inner plate 14 and the pressing plate 16 from moving toward the outer plate 13, thereby strengthening the strength of the box. Similarly, the tip of the spacer piece 118 that has become detached from the inner plate 121 abuts against the inner surface of the outer plate 120, preventing the inner plate 121 and the pressing plate 116 from moving toward the outer plate 120, thereby strengthening the strength of the box.

[0028] In this embodiment, in the primary assembly state, the spacer pieces 18 are disposed only on the outer plate 13, so that when the pressure plate 16 is folded upward into an angle, the spacer pieces 18 that have become detached from the inner plate 14 and protrude in the opposite direction from the pressure plate 16 do not come into contact with the connecting plate 22. Also, because the folded second side portion 119 is thicker due to the repulsive force of the paper, a space is likely to be created between the outer plate 13 and the inner plate 14, so that when the pressure plate 16 is folded upward into an angle, the spacer pieces 18 that protrude in the opposite direction from the pressure plate 16 are less likely to come into contact with the outer plate 13 and be damaged.

[0029] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. The technical scope of the present invention is not limited to the described embodiments, but rather 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]

[0030] 1, 3 Packaging box 2, 4 Deployment Sheet 11 Bottom plate 12 First side 13, 20, 120 outer plate 14, 21, 121 Inner plate 15, 115 Upper edge plate 16, 116 Retaining plate 17 Cut 18, 118, 218 Spacer pieces 19 Second Side 22 Connecting plate 23 Reinforcement plate 24 Lid plate 25 Insert plate

Claims

[Claim 1] a pair of first side portions opposing each other on one side of a rectangular bottom plate, and a pair of second side portions opposing each other on the other side, and a connecting plate between the first side portions and the second side portions, wherein at least the first side portion has an outer plate, an inner plate, an upper edge plate, a pressing plate, and a spacer piece formed by cutting into the inner plate, wherein the second side portion is overlapped on the bottom plate, the connecting plate is overlapped on the inner surface of the outer plate of the first side portion, and the inner plate is overlapped on the outer plate and the connecting plate of the first side portion to form a primary assembly, wherein in the primary assembly state, the spacer piece of the first side portion is positioned only on the bottom plate or the outer plate of the first side portion.

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