Packing box

Abstract

To provide a packing box having the improved strength of a wall part.SOLUTION: A packing box comprises two side wall parts, a wall part, and a flap part. The two side wall parts are disposed to face each other. The wall part is disposed between an end part of one side wall part and an end part of the other side wall part. The flap part extends from each of the end parts of the two side wall parts toward the opposing side wall parts and forms the wall part. At least one flap part of the two flap parts is formed so as to extend until abutting on the opposing side wall parts.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The disclosed embodiments relate to packing boxes.

Background Art

[0002] Conventionally, various techniques related to packing boxes for packing articles and the like have been proposed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the packing boxes according to the prior art, there is room for improvement in terms of improving the strength of the wall portions. Specifically, for example, in a rectangular parallelepiped packing box made by folding and assembling a sheet made of a paper material, there is one including two side wall portions arranged to face each other and a wall portion arranged between the ends of the two side wall portions. Also, there is one in which the wall portion is constituted by a flap portion extending from the end of the side wall portion toward the opposing side wall portion.

[0005] In such a flap portion extending from the side wall portion, since the arrangement position is difficult to stabilize, floating is likely to occur, and as a result, the strength of the wall portion constituted by the flap portion may decrease.

[0006] One aspect of the embodiment aims to provide a packing box capable of improving the strength of the wall portion.

Means for Solving the Problems

[0007] The packing box according to one aspect of the embodiment includes two side wall portions arranged to face each other, a wall portion arranged between an end portion of one of the side wall portions and an end portion of the other side wall portion, and flap portions that extend from the end portions of the two side wall portions toward the opposing side wall portions and constitute the wall portion. Among the two flap portions, at least one of the flap portions is formed to extend until it abuts against the opposing side wall portion.

[0008] As a result, the flap portion is in a tensioned state between the opposing side wall portions, and the arrangement position of the flap portion is stabilized. Therefore, since the wall portion constituted by the flap portion has a stable arrangement position, the occurrence of floating or the like can be suppressed, and as a result, the strength of the wall portion can be improved. Further, since the flap portion is in the tensioned state as described above, the occurrence of floating or the like of the side wall portion can be suppressed, and as a result, the strength of the side wall portion can also be improved.

[0009] In the packing box according to one aspect of the embodiment, the two flap portions each include a notch portion, and are arranged to intersect by locking the notch portions with each other.

[0010] As a result, the wall portion constituted by the two flap portions can effectively suppress the occurrence of floating or the like, and as a result, the strength of the wall portion can be further improved.

[0011] In the packing box according to one aspect of the embodiment, the flap portion formed to extend includes a base end portion that constitutes a portion from the end portion of the side wall portion to the notch portion, and an extension portion that is continuously formed from the base end portion and constitutes a portion from the notch portion to the tip end portion that abuts against the opposing side wall portion. The width of the extension portion in the height direction is equal to the width of the base end portion in the height direction.

[0012] In this way, since the width of the extension portion is equal to the width of the base end portion, the wall portion constituted by the flap portion can sufficiently secure the width in the height direction (vertical direction), and thus the strength of the wall portion can be further improved.

[0013] In the packing box according to one aspect of the embodiment, the flap portion formed to extend is formed at a tip portion that abuts on the opposing side wall portions, and includes a protruding portion that protrudes toward the side wall portions, and the side wall portions include an engaging portion with which the protruding portion can engage.

[0014] In this way, the flap portion can prevent the arrangement position from deviating from the intended position by engaging the protruding portion with the engaging portion. As a result, the wall portion formed by the flap portion has a more stable arrangement position, so that the occurrence of floating or the like can be further suppressed, and as a result, the strength of the wall portion can be further improved.

[0015] In the packing box according to one aspect of the embodiment, the protruding portion is provided at a lower end of the flap portion formed to extend, and the engaging portion is formed by a notch.

[0016] In this way, since the protruding portion and the engaging portion are provided at the above positions, the flap portion is less likely to float in the vertical direction, and the occurrence of floating or the like of the side wall portion can also be effectively suppressed. As a result, the strength of the wall portion formed by the flap portion and the side wall portion can be further improved. Further, since the engaging portion is a notch, it can be easily formed.

[0017] In the packing box according to one aspect of the embodiment, the two flap portions are each formed to extend until they abut on the opposing side wall portions.

[0018] As a result, the two flap portions are stretched between the opposing side wall portions, and the arrangement positions of the two flap portions are stabilized. Therefore, since the wall portion formed by the two flap portions has a stable arrangement position, the occurrence of floating or the like can be further suppressed, and as a result, the strength of the wall portion can be further improved. Further, since the two flap portions are in a stretched state as described above, the occurrence of floating or the like of the side wall portion can be further suppressed, and as a result, the strength of the side wall portion can also be further improved.

Effect of the Invention

[0019] According to one aspect of the embodiment, in the packing box, the strength of the wall portion can be improved.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Mode for Carrying Out the Invention

[0021] Hereinafter, embodiments of the packing box disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited by the embodiments shown below.

[0022] (First Embodiment) The packing box according to the first embodiment will be described with reference to FIG. 1. FIG. 1 is a perspective view of the packing box according to the first embodiment. Note that FIG. 1 and FIGS. 2 and subsequent figures described later are all schematic diagrams.

[0023] Also, in FIG. 1, for convenience of explanation, a three-dimensional orthogonal coordinate system in which the X-axis direction, the Y-axis direction, and the Z-axis direction orthogonal to each other are defined, and the positive Z-axis direction is the vertically upward direction is shown. Further, in the following description, the positive X-axis direction may be described as "rightward", the negative X-axis direction as "leftward", the positive Y-axis direction as "rearward", the negative Y-axis direction as "forward", the positive Z-axis direction as "upward", and the negative Z-axis direction as "downward". For this reason, in the following description, the X-axis direction may be referred to as the left-right direction, the Y-axis direction as the front-rear direction, and the Z-axis direction as the up-down direction (vertical direction). Such an orthogonal coordinate system may also be shown in other figures. Further, hereinafter, expressions such as "X-axis direction", "Y-axis direction", "Z-axis direction", "rightward", "leftward", "rearward", "forward", "upward", and "downward" are used, but this means the "X-axis direction" etc. when the packing box is in the illustrated state, and does not limit the arrangement direction etc. of the packing box.

[0024] As shown in FIG. 1, the packing box 1 is a box for accommodating and packing articles (not shown) inside. The packing box 1 is formed in a rectangular parallelepiped shape, for example, but the shape of the packing box 1 is not limited to this.

[0025] The packaging box 1 includes a bottom portion 10, side wall portions 20 and 30, wall portions 40 and 50, and a lid portion 60. In FIG. 1, for the convenience of understanding, the state where the lid portion 60 is opened is shown.

[0026] The bottom portion 10 is formed in a rectangular shape in plan view and is arranged to be located downward (in the negative Z-axis direction) in the packaging box 1. The side wall portion 20 is erected so as to extend upward (in the positive Z-axis direction) from the end portion 10a on the right side (in the positive X-axis direction) of the bottom portion 10. The side wall portion 30 is erected so as to extend upward from the end portion 10b on the left side (in the negative X-axis direction) of the bottom portion 10. Therefore, the two side wall portions 20 and 30 are arranged to face each other in the left-right direction (X-axis direction). Hereinafter, the side wall portion 20 may be referred to as the "right side wall portion 20" and the side wall portion 30 may be referred to as the "left side wall portion 30".

[0027] The wall portion 40 is erected so as to extend upward from the end portion 10c in front (in the negative Y-axis direction) of the bottom portion 10. The wall portion 50 is erected so as to extend upward from the end portion 10d behind (in the positive Y-axis direction) of the bottom portion 10. Therefore, the two wall portions 40 and 50 are arranged to face each other in the front-rear direction (Y-axis direction). Hereinafter, the wall portion 40 may be referred to as the "front wall portion 40" and the wall portion 50 may be referred to as the "rear wall portion 50".

[0028] The front wall portion 40 is arranged between the front end portion 20a of the right side wall portion 20 and the front end portion 30a of the left side wall portion 30. The rear wall portion 50 is arranged between the rear end portion 20b of the right side wall portion 20 and the rear end portion 30b of the left side wall portion 30.

[0029] The lid portion 60 is formed to be continuous with the rear wall portion 50 and is configured to be able to open and close the accommodation space A of the packaging box 1.

[0030] Here, while also referring to FIG. 2, the packaging box 1 will be described in detail. FIG. 2 is an exploded view of the packaging box 1 according to the first embodiment. The packaging box 1 according to the present embodiment is assembled by bending a sheet made of, for example, paper material. FIG. 2 shows that sheet. That is, the sheet shown in FIG. 2 becomes the packaging box 1 shown in FIG. 1 when bent and assembled. In FIG. 2, the valley fold line is shown by a broken line, and the mountain fold line is shown by a dashed line. Also, as the above-mentioned paper material, cardboard, corrugated board, etc. can be used, but it is not limited thereto.

[0031] As shown in FIG. 2 and the like, the right side wall portion 20 has a double wall structure and includes an outer right side wall portion 21 and an inner right side wall portion 22. The outer right side wall portion 21 is formed to be continuous from the right end portion 10a of the bottom portion 10, and is arranged to be on the outside of the packaging box 1 during assembly by being bent along the valley fold line 21x. The inner right side wall portion 22 is arranged to be on the inside of the packaging box 1 (i.e., the accommodation space side) during assembly by being bent along the valley fold line 22x.

[0032] A tongue piece 22a is formed at the front end portion of the inner right side wall portion 22. The tongue piece 22a is bent along the mountain fold line 22y and is inserted into the gap between the outer front wall portion 41 and the inner front wall portion 42 of the front wall portion 40 to be described later during assembly, thereby connecting the right side wall portion 20 and the front wall portion 40.

[0033] Also, a front engaging portion 23 is formed between the inner right side wall portion 22 and the tongue piece 22a. The front engaging portion 23 is a notch formed along the above-mentioned mountain fold line 22y. Note that the front protruding portion 42a of the front wall portion 40 to be described later is inserted and engaged with the front engaging portion 23 during assembly.

[0034] Also, a first flap portion 51 is formed at the rear end portion of the inner right side wall portion 22. The first flap portion 51 is bent along the mountain fold line 22z and constitutes the rear wall portion 50 during assembly. The configuration of the first flap portion 51 will be described in detail later.

[0035] Also, an engaging portion 24 is formed between the inner right side wall portion 22 and the first flap portion 51. The engaging portion 24 is a notch formed along the above-described mountain fold line 22z. The engaging portion 24 is configured such that a protruding portion 55 of a second flap portion 52 described later can be engaged therewith. Specifically, at the time of assembly, the protruding portion 55 of the second flap portion 52 is inserted into and engaged with the engaging portion 24, which will be described later.

[0036] The left side wall portion 30 has a double-wall structure and includes an outer left side wall portion 31 and an inner left side wall portion 32. The outer left side wall portion 31 is formed to be continuous from the left end portion 10b of the bottom portion 10 and is arranged to be on the outer side of the packing box 1 at the time of assembly by being bent along a valley fold line 31x. The inner left side wall portion 32 is arranged to be on the inner side (i.e., the accommodation space side) of the packing box 1 at the time of assembly by being bent along a valley fold line 32x.

[0037] A tongue piece 32a is formed at the front end portion of the inner left side wall portion 32. The tongue piece 32a is bent along a mountain fold line 32y and is inserted into a gap between an outer front wall portion 41 and an inner front wall portion 42 of a front wall portion 40 described later at the time of assembly, thereby connecting the left side wall portion 30 and the front wall portion 40.

[0038] Also, a front engaging portion 33 is formed between the inner left side wall portion 32 and the tongue piece 32a. The front engaging portion 33 is a notch formed along the above-described mountain fold line 32y. Note that at the time of assembly, a front protruding portion 42b of the front wall portion 40 described later is inserted into and engaged with the front engaging portion 33.

[0039] Also, a second flap portion 52 is formed at the rear end portion of the inner left side wall portion 32. The second flap portion 52 is bent along a mountain fold line 32z and constitutes the rear wall portion 50 at the time of assembly. The configuration of the second flap portion 52 will be described in detail later.

[0040] The front wall portion 40 has a double-wall structure and includes an outer front wall portion 41 and an inner front wall portion 42. The outer front wall portion 41 is formed so as to be continuous from the front end portion 10c of the bottom portion 10, and is bent along a valley fold line 41x so as to be disposed on the outer side of the packing box 1 during assembly. The inner front wall portion 42 is bent along a valley fold line 42x so as to be disposed on the inner side of the packing box 1 (i.e., the accommodation space side) during assembly.

[0041] A tongue piece 41a is formed at the right end of the outer front wall portion 41. The tongue piece 41a is bent along a valley fold line 41y and is inserted into the gap between the outer right side wall portion 21 and the inner right side wall portion 22 during assembly, thereby connecting the front wall portion 40 and the right side wall portion 20. Also, a tongue piece 41b is formed at the left end of the outer front wall portion 41. The tongue piece 41b is bent along a valley fold line 41z and is inserted into the gap between the outer left side wall portion 31 and the inner left side wall portion 32 during assembly, thereby connecting the front wall portion 40 and the left side wall portion 30.

[0042] A front protruding portion 42a protruding rightward is formed at the right end of the inner front wall portion 42. FIG. 3 is a perspective view showing an enlarged view of the vicinity of the front protruding portion 42a during assembly. As shown in FIG. 3, the front protruding portion 42a is formed at the lower end 42c of the inner front wall portion 42 during assembly. Then, the front protruding portion 42a is inserted into and engaged with the front engaging portion 23 during assembly. Also, a front protruding portion 42b protruding leftward is formed at the left end of the inner front wall portion 42 (see FIG. 2). The front protruding portion 42b is also formed at the lower end 42c of the inner front wall portion 42 during assembly. Although illustration is omitted because it is the same as the front protruding portion 42a, the front protruding portion 42b is inserted into and engaged with the front engaging portion 33 during assembly. In this way, the front protruding portions 42a and 42b formed at both ends in the left-right direction of the inner front wall portion 42 are engaged with the front engaging portion 23 of the right side wall portion 20 and the front engaging portion 33 of the left side wall portion 30, so that the arrangement position of the front wall portion 40 is stabilized, the occurrence of floating and the like can be suppressed, and as a result, the strength of the front wall portion 40 can be improved.

[0043] The rear wall portion 50 has a structure in which a plurality of walls overlap. The rear wall portion 50 includes the above-described first flap portion 51, the second flap portion 52, and the outer rear wall portion 53.

[0044] As shown in FIG. 2, the outer rear wall portion 53 is formed to be continuous from the rear end portion 10d of the bottom portion 10, and is folded along the valley fold line 53x so as to be disposed on the outside of the packing box 1 during assembly.

[0045] A tongue piece 53a is formed at the right end portion of the outer rear wall portion 53. The tongue piece 53a is folded along the valley fold line 53y and is inserted into the gap between the outer right side wall portion 21 and the inner right side wall portion 22 during assembly, thereby connecting the rear wall portion 50 and the right side wall portion 20. Further, a tongue piece 53b is formed at the left end portion of the outer rear wall portion 53. The tongue piece 53b is folded along the valley fold line 53z and is inserted into the gap between the outer left side wall portion 31 and the inner left side wall portion 32 during assembly, thereby connecting the rear wall portion 50 and the left side wall portion 30.

[0046] As described above, the first flap portion 51 is folded along the mountain fold line 22z and constitutes the rear wall portion 50 during assembly. Also, the second flap portion 52 is folded along the mountain fold line 32z and constitutes the rear wall portion 50 during assembly. FIG. 4 is a perspective view showing an enlarged view of the vicinity of the first and second flap portions 51 and 52 during assembly. As shown in FIGS. 1 and 4, the first and second flap portions 51 and 52 constituting the rear wall portion 50 are disposed on the inner side (i.e., the accommodation space side) of the outer rear wall portion 53 during assembly.

[0047] The first flap portion 51 is formed in a plate shape and in a rectangular shape. During assembly, the first flap portion 51 is formed to extend from the rear end portion 20b of the right side wall portion 20 (more precisely, the inner right side wall portion 22) toward the opposing left side wall portion 30 (more precisely, the inner left side wall portion 32).

[0048] The lateral width L51 of the first flap portion 51 during assembly is set to be shorter than the distance La between the right side wall portion 20 and the left side wall portion 30 (accurately, the distance between the inner right side wall portion 22 and the inner left side wall portion 32). Therefore, the first flap portion 51 is formed such that the tip portion 51a does not contact the opposing left side wall portion 30 (accurately, the inner left side wall portion 32).

[0049] The first flap portion 51 includes a first notch portion 54. The first notch portion 54 is formed, for example, near the tip portion 51a of the first flap portion 51, but its position is not limited thereto. As shown in FIGS. 1 and 4, the first notch portion 54 is a notch that is open upward during assembly. Note that the first notch portion 54 is an example of a notch portion.

[0050] The second flap portion 52 is formed in a plate shape and is formed in a rectangular shape. During assembly, the second flap portion 52 is formed to extend from the rear end portion 30b of the left side wall portion 30 (accurately, the inner left side wall portion 32) toward the opposing right side wall portion 20 (accurately, the inner right side wall portion 22).

[0051] The lateral width L52 of the second flap portion 52 during assembly is set to be the same as or longer than the distance La between the right side wall portion 20 and the left side wall portion 30. Therefore, the second flap portion 52 is formed such that the tip portion 52a contacts the opposing right side wall portion 20 (accurately, the inner right side wall portion 22). In other words, the second flap portion 52 is formed to extend until it contacts the opposing right side wall portion 20. Note that the second flap portion 52 is an example of a flap portion formed to extend.

[0052] Thus, since the second flap portion 52 is formed to extend until it abuts against the opposing right side wall portion 20, it is in a tensioned state between the right side wall portion 20 and the left side wall portion 30, and the arrangement position of the second flap portion 52 is stabilized. Therefore, since the arrangement position of the rear wall portion 50 formed by the second flap portion 52 is stabilized, it is possible to suppress the occurrence of bulges or the like that bulge in the direction of arrow B in FIG. 4, and as a result, the strength of the rear wall portion 50 can be improved. Further, since the second flap portion 52 is in a tensioned state as described above, it is possible to suppress the occurrence of bulges in the right side wall portion 20 (see arrow C) and the left side wall portion 30 (see arrow D in FIG. 1), and as a result, the strength of the right side wall portion 20 and the left side wall portion 30 can also be improved. Further, since the second flap portion 52 is in a tensioned state as described above, in addition to suppressing the bulge in the direction of arrow B, it is also possible to suppress the occurrence of bulges in the vertical direction (see arrow E).

[0053] Further, the second flap portion 52 is provided with a protruding portion 55. The protruding portion 55 is formed at the tip portion 52a that abuts against the opposing right side wall portion 20. The protruding portion 55 is formed to protrude from the tip portion 52a toward the right side wall portion 20. As shown in FIGS. 1 and 4, at the time of assembly, the protruding portion 55 is inserted into and engaged with an engaging portion 24 provided on the inner right side wall portion 22.

[0054] Thus, the second flap portion 52 can suppress the arrangement position from deviating from the intended position due to the engagement of the protruding portion 55 with the engaging portion 24. Thereby, since the arrangement position of the rear wall portion 50 formed by the second flap portion 52 is more stable, it is possible to further suppress the occurrence of bulges or the like, and as a result, the strength of the rear wall portion 50 can be further improved.

[0055] Further, the protruding portion 55 is provided at the lower end 52b of the second flap portion 52 at the time of assembly. Since the engaging portion 24 is at a position corresponding to the protruding portion 55, it is provided at the lower end 22b of the right side wall portion 20 (more precisely, the inner right side wall portion 22) at the time of assembly. Since the engaging portion 24 is located at the lower end 22b, it is formed by a notch.

[0056] Thus, since the protruding portion 55 and the engaging portion 24 are provided at the above-mentioned positions, the second flap portion 52 is less likely to float in the vertical direction (see arrow E), and the occurrence of floating of the right side wall portion 20 (see arrow C) can also be effectively suppressed. Furthermore, when the protruding portion 55 engages with the engaging portion 24, the second flap portion 52 can suppress the occurrence of floating not only in the vertical direction (see arrow E) but also in a direction bulging toward the arrow B direction. Thereby, the strength of the rear wall portion 50 formed by the second flap portion 52 and the right side wall portion 20 can be further improved. Furthermore, since the engaging portion 24 is a notch, it can be easily formed.

[0057] In the above description, an example in which the protruding portion 55 and the engaging portion 24 are provided at the lower end 52b of the second flap portion 52 and the lower end 22b of the right side wall portion 20 is shown, but the present invention is not limited thereto. That is, the protruding portion 55 and the engaging portion 24 may be provided at an intermediate position in the vertical direction of the second flap portion 52 and the right side wall portion 20, or may be provided at the upper end. When the engaging portion 24 is provided at an intermediate position in the vertical direction of the right side wall portion 20, the engaging portion 24 will be formed by a through hole.

[0058] The second flap portion 52 includes a second notch portion 56. The second notch portion 56 is formed at a portion corresponding to the first notch portion 54 of the first flap portion 51 during assembly. In other words, the second notch portion 56 is formed near the center in the left-right direction of the second flap portion 52 during assembly. As shown in FIGS. 1 and 4, the second notch portion 56 is a notch that is open at the lower side during assembly. Note that the second notch portion 56 is an example of a notch portion.

[0059] The first flap portion 51 and the second flap portion 52 are arranged to intersect by locking the notch portions (the first and second notch portions 54, 56) of each other. Specifically, the first flap portion 51 and the second flap portion 52 are hooked and locked with a first notch portion 54 having an upper side open and a second notch portion 56 having a lower side open, and are arranged to intersect at the portions of the first and second notch portions 54, 56. In other words, the first flap portion 51 and the second flap portion 52 are arranged to intersect such that the tip portions 51a of the first flap portion 51 and the tip portion 52a of the second flap portion 52 are both exposed to the accommodation space side during assembly.

[0060] In this way, by arranging the first and second flap portions 51, 52 to intersect, the rear wall portion 50 formed by the first and second flap portions 51, 52 can effectively suppress the occurrence of floating (see arrow B), etc., and as a result, the strength of the rear wall portion 50 can be further improved.

[0061] Also, as shown in FIGS. 1 and 2, the second flap portion 52 includes a base end portion 57a and an extension portion 57b. In other words, the second flap portion 52 is partitioned into a base end portion 57a and an extension portion 57b.

[0062] The base end portion 57a constitutes a portion from the rear end portion 30b of the left side wall portion 30 (specifically, the inner left side wall portion 32) to the second notch portion 56. The extension portion 57b is continuously formed from the base end portion 57a. The extension portion 57b constitutes a portion from the second notch portion 56 to the tip portion 52a that abuts against the opposing right side wall portion 20 (specifically, the inner right side wall portion 22).

[0063] The width L57b in the height direction (vertical direction) of the extension portion 57b during assembly is set to be equal to the width L57a in the height direction of the base end portion 57a. In other words, the width L57b in the height direction of the extension portion 57b is set to be the same or substantially the same as the width L57a in the height direction of the base end portion 57a.

[0064] In this way, since the width L57b of the extension portion 57b is equal to the width L57a of the base end portion 57a, the rear wall portion 50 formed by the second flap portion 52 can secure a sufficient width in the height direction (vertical direction). Therefore, the strength of the rear wall portion 50 can be further improved. Furthermore, since the width L57b of the extension portion 57b in the height direction is set to be equal to the width L57a of the base end portion 57a in the height direction, the tip portion 52a can be made relatively wide. Since the second flap portion 52 having a relatively wide tip portion 52a is in the stretched state as described above, the floating in the vertical direction (refer to arrow E) can be suppressed. Also, in the second flap portion 52, since the protruding portion 55 provided at the relatively wide tip portion 52a engages with the engaging portion 24, the floating in the vertical direction (refer to arrow E) can be further suppressed.

[0065] The lid portion 60 includes a main body portion 61 and a lid locking portion 62. The main body portion 61 is formed to be continuous from the upper end portion 53c of the outer rear wall portion 53 and is bent along the valley fold line 61x so as to be disposed as the upper surface of the packing box 1 during assembly.

[0066] A tongue piece 61a is formed at the right end of the main body portion 61. The tongue piece 61a is bent along the valley fold line 61y. The tongue piece 61a guides the lid portion 60 (specifically, the main body portion 61) by moving along the inner side of the inner right side wall portion 22 when the lid portion 60 is closed. A tongue piece 61b is formed at the left end of the main body portion 61. The tongue piece 61b is bent along the valley fold line 61z. The tongue piece 61b guides the lid portion 60 (specifically, the main body portion 61) by moving along the inner side of the inner left side wall portion 32 when the lid portion 60 is closed.

[0067] The lid locking portion 62 is formed to be continuous with the main body portion 61 and is bent along the valley fold line 62x. A tongue piece 62a is formed at the right end of the lid locking portion 62. The tongue piece 62a is bent along the valley fold line 62y and is inserted into the gap between the outer right side wall portion 21 and the inner right side wall portion 22 when the lid portion 60 is closed, thereby locking the lid portion 60 (specifically, the main body portion 61) to the front wall portion 40. Further, a tongue piece 62b is formed at the left end of the lid locking portion 62. The tongue piece 62b is bent along the valley fold line 62z and is inserted into the gap between the outer left side wall portion 31 and the inner left side wall portion 32 when the lid portion 60 is closed, thereby locking the lid portion 60 (specifically, the main body portion 61) to the front wall portion 40.

[0068] As described above, the packing box 1 according to the first embodiment includes a right side wall portion 20 and a left side wall portion 30 (an example of two side wall portions), a rear wall portion 50 (an example of a wall portion), and first and second flap portions 51, 52 (an example of flap portions). The right side wall portion 20 and the left side wall portion 30 are arranged to face each other. The rear wall portion 50 is arranged between the right side wall portion 20 and the left side wall portion 30. The first and second flap portions 51, 52 extend from the ends of the right side wall portion 20 and the left side wall portion 30 toward the opposing right side wall portion 20 and left side wall portion 30, respectively, and constitute the rear wall portion 50. At least the second flap portion 52 of the first and second flap portions 51, 52 is formed to extend until it abuts against the opposing right side wall portion 20. Thereby, the strength of the rear wall portion 50 (wall portion) can be improved.

[0069] (Second Embodiment) Next, the configuration of the packing box 1a according to the second embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view of the packing box 1a according to the second embodiment. FIG. 6 is a developed view of the packing box 1a according to the second embodiment. In the following, for the components common to the first embodiment, the same reference numerals are used and the description thereof is omitted.

[0070] As shown in FIGS. 5 and 6, in the packing box 1a according to the second embodiment, instead of the tongue pieces 53a, 53b of the first embodiment, folding portions 153a, 153b are provided.

[0071] The folding part 153a is formed so as to be continuous from the right end of the outer rear wall part 53. Further, the folding part 153a is formed so as to be continuous from the rear end of the outer right side wall part 21. The folding part 153a is bent along the valley fold lines 153ax, 153ay and the mountain fold line 153az, and is inserted into the gap between the first flap part 51 and the outer rear wall part 53 during assembly, thereby connecting the rear wall part 50 and the right side wall part 20.

[0072] The folding part 153b is formed so as to be continuous from the left end of the outer rear wall part 53. Further, the folding part 153b is formed so as to be continuous from the rear end of the outer left side wall part 31. The folding part 153b is bent along the valley fold lines 153bx, 153by and the mountain fold line 153bz, and is inserted into the gap between the second flap part 52 and the outer rear wall part 53 during assembly, thereby connecting the rear wall part 50 and the left side wall part 30.

[0073] Even when the packing box 1a according to the second embodiment is configured as described above, the same effects as those of the first embodiment can be obtained.

[0074] (Third Embodiment) Next, the configuration of the packing box 1b according to the third embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is a perspective view of the packing box 1b according to the third embodiment. FIG. 8 is a developed view of the packing box 1b according to the third embodiment.

[0075] As shown in FIGS. 7 and 8, in the packing box 1b according to the third embodiment, the first flap part 51 is configured to have a lateral width equal to or greater than that of the second flap part 52. More specifically, the lateral width L51 of the first flap part 51 during assembly is set to be the same as or longer than the distance La between the right side wall part 20 and the left side wall part 30.

[0076] FIG. 9 is a perspective view showing an enlarged view of the vicinity of the tip 51a of the first flap portion 51 during assembly. As shown in FIGS. 7 and 9, the first flap portion 51 is formed such that the tip 51a abuts against the opposing left side wall portion 30 (more precisely, the inner left side wall portion 32). In other words, the first flap portion 51 is formed to extend until it abuts against the opposing left side wall portion 30.

[0077] As described above, since the first flap portion 51 is formed to extend until it abuts against the opposing left side wall portion 30, it is in a tensioned state between the right side wall portion 20 and the left side wall portion 30, and the arrangement position of the first flap portion 51 is stabilized. Therefore, since the arrangement position of the rear wall portion 50 formed by the first flap portion 51 is stabilized, it is possible to suppress the occurrence of floating such as bulging in the direction of arrow F in FIG. 9, and as a result, the strength of the rear wall portion 50 can be improved. Further, since the first flap portion 51 is in the tensioned state as described above, it is possible to suppress the occurrence of floating of the left side wall portion 30 (see arrow G) and floating of the right side wall portion 20 (see arrow H in FIG. 7), and as a result, the strength of the right side wall portion 20 and the left side wall portion 30 can also be improved. Further, since the first flap portion 51 is in the tensioned state, in addition to suppressing the floating in the direction of arrow F described above, it is also possible to suppress the occurrence of floating in the vertical direction (see arrow J).

[0078] Further, the first flap portion 51 includes a protruding portion 255. The protruding portion 255 is formed at the tip 51a that abuts against the opposing left side wall portion 30. The protruding portion 255 is formed to protrude from the tip 51a toward the left side wall portion 30.

[0079] Further, an engaging portion 234 is formed between the inner left side wall portion 32 and the second flap portion 52. The engaging portion 234 is a notch formed along the mountain fold line 32z. The engaging portion 234 is configured such that the protruding portion 255 of the first flap portion 51 can be engaged. That is, as shown in FIGS. 7 and 9, the protruding portion 255 is inserted into and engaged with the engaging portion 234 provided on the inner left side wall portion 32 during assembly.

[0080] In this way, when the protruding portion 255 engages with the engaging portion 234, the first flap portion 51 can be prevented from shifting from its intended position. As a result, the rear wall portion 50 formed by the first flap portion 51 is more stable in its arranged position, so that the occurrence of floating or the like can be further suppressed, and as a result, the strength of the rear wall portion 50 can be further improved.

[0081] Further, the protruding portion 255 is provided at the lower end 51b of the first flap portion 51 during assembly. Since the engaging portion 234 is located at a position corresponding to the protruding portion 255, it is provided at the lower end 32b of the left side wall portion 30 (more precisely, the inner left side wall portion 32) during assembly. Since the engaging portion 234 is located at the lower end 32b, it is formed by a notch.

[0082] In this way, since the protruding portion 255 and the engaging portion 234 are provided at the above positions, the first flap portion 51 is less likely to float in the vertical direction (see arrow J), and the occurrence of floating of the left side wall portion 30 (see arrow G) can also be effectively suppressed. Further, when the protruding portion 255 engages with the engaging portion 234, in addition to suppressing floating in the vertical direction (see arrow J), the first flap portion 51 can also suppress the occurrence of floating that bulges in the direction of arrow F. As a result, the strength of the rear wall portion 50 formed by the first flap portion 51 and the left side wall portion 30 can be further improved. Further, since the engaging portion 234 is a notch, it can be easily formed.

[0083] Note that, in the above description, an example in which the protruding portion 255 and the engaging portion 234 are provided at the lower end 51b of the first flap portion 51 and the lower end 32b of the left side wall portion 30 is shown, but the present invention is not limited thereto. That is, the protruding portion 255 and the engaging portion 234 may be provided at an intermediate position in the vertical direction of the first flap portion 51 and the left side wall portion 30, or may be provided at the upper end. When the engaging portion 234 is provided at an intermediate position in the vertical direction of the left side wall portion 30, the engaging portion 234 will be formed by a through hole.

[0084] Further, as shown in FIGS. 7 and 8, the first flap portion 51 includes a base end portion 58a and an extension portion 58b. In other words, the first flap portion 51 is partitioned into a base end portion 58a and an extension portion 58b.

[0085] The base end portion 58a constitutes a portion from the rear end portion 20b of the right side wall portion 20 (more precisely, the inner right side wall portion 22) to the first notch portion 54. The extension portion 58b is formed continuously from the base end portion 58a. The extension portion 58b constitutes a portion from the first notch portion 54 to the tip portion 51a that abuts against the opposing left side wall portion 30 (more precisely, the inner left side wall portion 32).

[0086] The width L58b in the height direction (vertical direction) of the extension portion 58b at the time of assembly is set to be equal to the width L58a in the height direction of the base end portion 58a. In other words, the width L58b in the height direction of the extension portion 58b is set to be the same or substantially the same as the width L58a in the height direction of the base end portion 58a.

[0087] In this way, since the width L58b of the extension portion 58b is equal to the width L58a of the base end portion 58a, the rear wall portion 50 formed by the first flap portion 51 can sufficiently secure the width in the height direction (vertical direction), and thus the strength of the rear wall portion 50 can be further improved. Furthermore, since the width L58b in the height direction of the extension portion 58b is set to be equal to the width L58a in the height direction of the base end portion 58a, the tip portion 51a can be made relatively wide. Since the first flap portion 51 having the relatively wide tip portion 51a is in the stretched state as described above, floating in the vertical direction (see arrow J) can be suppressed. Also, in the first flap portion 51, since the protruding portion 255 provided at the relatively wide tip portion 51a engages with the engaging portion 234, floating in the vertical direction (see arrow J) can be further suppressed.

[0088] Note that the remaining effects in the third embodiment are the same as those in the previous embodiments.

[0089] (Fourth Embodiment) Next, the configuration of the packaging box 1c according to the fourth embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a perspective view of the packaging box 1c according to the fourth embodiment. FIG. 11 is a developed view of the packaging box 1c according to the fourth embodiment.

[0090] As shown in FIGS. 10 and 11, in the packaging box 1c according to the fourth embodiment, instead of the tongue pieces 53a and 53b of the third embodiment of the packaging box 1c according to the fourth embodiment, folding portions 353a and 353b are provided.

[0091] The folding portion 353a is formed so as to be continuous from the right end portion of the outer rear wall portion 53. Further, the folding portion 353a is formed so as to be continuous from the rear end portion of the outer right side wall portion 21. The folding portion 353a is bent along valley fold lines 353ax, 353ay and a mountain fold line 353az, and is inserted into the gap between the first flap portion 51 and the outer rear wall portion 53 during assembly to connect the rear wall portion 50 and the right side wall portion 20.

[0092] The folding portion 353b is formed so as to be continuous from the left end portion of the outer rear wall portion 53. Further, the folding portion 353b is formed so as to be continuous from the rear end portion of the outer left side wall portion 31. The folding portion 353b is bent along valley fold lines 353bx, 353by and a mountain fold line 353bz, and is inserted into the gap between the second flap portion 52 and the outer rear wall portion 53 during assembly to connect the rear wall portion 50 and the left side wall portion 30.

[0093] Even when the packaging box 1c according to the fourth embodiment is configured as described above, the same effects as those of the previous embodiments can be obtained.

[0094] (Fifth Embodiment) Next, the configuration of the packaging box 1d according to the fifth embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a perspective view of the packaging box 1d according to the fifth embodiment. FIG. 13 is a developed view of the packaging box 1d according to the fifth embodiment.

[0095] As shown in FIGS. 12 and 13, in the packing box 1d according to the fifth embodiment, the first and second flap portions 51 and 52 described in the third embodiment are arranged so as not to intersect. More specifically, the first notch portion 54 is not formed in the first flap portion 51. The second notch portion 56 is not formed in the second flap portion 52. Further, the second flap portion 52 is arranged to be on the inner side (i.e., the accommodation space side) of the packing box 1 rather than the first flap portion 51 during assembly.

[0096] In addition, an engaging portion 434 is formed between the outer rear wall portion 53 and the tongue piece 53b. The engaging portion 434 is a notch formed along the valley fold line 53z. The engaging portion 434 is configured such that the protruding portion 255 of the first flap portion 51 can be engaged therewith.

[0097] FIG. 14 is a perspective view showing an enlarged view of the vicinity of the tip portion 51a of the first flap portion 51 during assembly. In FIG. 14, for the sake of convenience of understanding, the engaging portion 434 is shown by a dashed line, and the illustration of the tongue piece 53b and the like is omitted. As shown in FIGS. 12 and 14, the protruding portion 255 of the first flap portion 51 is inserted into and engaged with the engaging portion 434 during assembly.

[0098] In this way, the first flap portion 51 can suppress the displacement of the arrangement position from the intended position due to the engagement of the protruding portion 255 with the engaging portion 434. As a result, the rear wall portion 50 formed by the first flap portion 51 has a more stable arrangement position, so that the occurrence of floating and the like can be further suppressed, and as a result, the strength of the rear wall portion 50 can be further improved.

[0099] In this way, in the packing box 1d according to the fifth embodiment, even when the first and second flap portions 51 and 52 are arranged so as not to intersect, the same effects as those of the previous embodiments can be obtained.

[0100] In the above description, an example in which the right side wall portion 20, the left side wall portion 30, and the front wall portion 40 have a double wall structure has been shown, but the present invention is not limited thereto. That is, a part or all of the right side wall portion 20, the left side wall portion 30, and the front wall portion 40 may be configured by one wall, or may be configured by three or more walls.

[0101] <Supplementary Note> According to each of the above embodiments, for example, the following packaging boxes can be provided. (1) Two side wall portions arranged to face each other, A wall portion arranged between the end of one of the side wall portions and the end of the other side wall portion, Flap portions that extend from the ends of the two side wall portions toward the opposing side wall portions and constitute the wall portion and Among the two flap portions, at least one of the flap portions is formed to extend until it abuts against the opposing side wall portion A packaging box characterized by the above. (1) According to the packaging box of (1), the flap portion is in a tensioned state between the opposing side wall portions, and the arrangement position of the flap portion is stabilized. Therefore, the wall portion constituted by the flap portion has a stable arrangement position, so that the occurrence of floating or the like can be suppressed, and as a result, the strength of the wall portion can be improved. Further, since the flap portion is in a tensioned state as described above, the occurrence of floating or the like of the side wall portion can be suppressed, and as a result, the strength of the side wall portion can also be improved. Further, since the flap portion is in a tensioned state as described above, the occurrence of floating in the vertical direction can also be suppressed.

[0102] (2) The two flap portions each include a notch portion, and are arranged to intersect by locking the notch portions with each other. The packaging box according to (1), characterized by the above. According to the packing box of (2), the wall portion formed by the two flap portions can effectively suppress the occurrence of floating or the like, and as a result, the strength of the wall portion can be further improved.

[0103] (3) The flap portion formed to extend includes a base end portion that constitutes a portion from the end portion of the side wall portion to the notch portion, and an extension portion that is continuously formed from the base end portion and constitutes a portion from the notch portion to the tip end portion that abuts on the opposing side wall portion and is characterized in that the width in the height direction of the extension portion is equal to the width in the height direction of the base end portion. The packing box according to (2). According to the packing box of (3), since the width of the extension portion is equal to the width of the base end portion, the wall portion formed by the flap portion can sufficiently secure the width in the height direction (vertical direction), and thus the strength of the wall portion can be further improved. Further, since the width in the height direction of the extension portion is set to be equal to the width in the height direction of the base end portion, the tip end portion can be made relatively wide. Since the flap portion having a relatively wide tip end portion is in the stretched state as described above, floating in the vertical direction can be suppressed.

[0104] (4) The flap portion formed to extend includes a protruding portion formed at the tip end portion that abuts on the opposing side wall portion and protruding toward the side wall portion and is characterized in that the side wall portion includes an engaging portion with which the protruding portion can engage. The packing box according to any one of (1) to (3). According to the packing box of (4), the flap portion can suppress the displacement of the arrangement position from the intended position by the engagement of the protruding portion with the engaging portion. As a result, the wall portion formed by the flap portion has a more stable arrangement position, so that the occurrence of floating or the like can be further suppressed, and as a result, the strength of the wall portion can be further improved.

[0105] (5) The protruding portion is provided at the lower end of the flap portion formed to extend, The engaging portion is formed by a notch The packing box according to (4), characterized in that. (5) According to the packing box, since the protruding portion and the engaging portion are provided at the above positions, the flap portion is less likely to float in the vertical direction, and the occurrence of floating of the side wall portion can also be effectively suppressed. Thereby, the strength of the wall portion constituted by the flap portion and the side wall portion can be further improved. Further, since the engaging portion is a notch, it can be easily formed.

[0106] (6) The two flap portions are each formed to extend until they abut against the opposing side wall portions The packing box according to any one of (1) to (5), characterized in that. (6) According to the packing box, the two flap portions are in a stretched state between the opposing side wall portions, and the arrangement positions of the two flap portions are stabilized. Therefore, since the arrangement position of the wall portion constituted by the two flap portions is stabilized, the occurrence of floating and the like can be further suppressed, and as a result, the strength of the wall portion can be further improved. Further, since the two flap portions are in the stretched state as described above, the occurrence of floating of the side wall portion and the like can be further suppressed, and as a result, the strength of the side wall portion can also be further improved. Further, since the two flap portions are in the stretched state as described above, the occurrence of floating in the vertical direction can also be suppressed.

[0107] Further effects and modifications can be easily derived by those skilled in the art. Therefore, a broader aspect of the present invention is not limited to the specific details and representative embodiments described and represented as above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Description of Reference Numerals

[0108] 1, 1a, 1b, 1c, 1d, packing box 20 right side wall portion 30 left side wall portion 50 rear wall portion 51 first flap portion 52 second flap portion

Claims

1. Two side wall portions arranged opposite to each other, A wall portion arranged between an end of one of the side wall portions and an end of the other side wall portion, Flap portions that extend from the ends of the two side wall portions respectively toward the opposite side wall portions and constitute the wall portion And comprising, Among the two flap portions, at least one of the flap portions is formed to extend until it abuts against the opposite side wall portion A packing box characterized by this.

2. The two flap portions each have a notch portion, and are arranged to intersect by locking the notch portions of each other The packing box according to Claim 1, characterized by this.

3. The flap portion formed to extend, A base end portion that constitutes a portion from the end of the side wall portion to the notch portion, An extension portion that is continuously formed from the base end portion and constitutes a portion from the notch portion to the tip end portion that abuts against the opposite side wall portion And comprising, The width in the height direction of the extension portion is equal to the width in the height direction of the base end portion The packing box according to Claim 2, characterized by this.

4. The flap portion formed to extend, A protruding portion formed at the tip end portion that abuts against the opposite side wall portion and protrudes toward the side wall portion And comprising, The side wall portion, An engaging portion into which the protruding portion can engage The packing box according to Claim 1, characterized by comprising this.

5. The protruding portion, Is provided at the lower end of the flap portion formed to extend, The engaging portion, Is formed by a notch The packing box according to Claim 4, characterized by this.

6. The two flap portions are each formed to extend until they abut against the opposite side wall portions The packing box according to Claim 1, characterized by this.

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