JP7212084B2 - Folding boxes and box units - Google Patents

Description

The present disclosure relates to folding boxes and box units.

The heat insulating container disclosed in Patent Document 1 has a foldable structure. This heat-insulating container is formed by integrally connecting a plurality of pressure plate members having heat-insulating properties, and is assembled into a hollow container shape. In the folding process, the side walls (a pair of tilting panels and a pair of folding panels) are laid inwardly on the bottom panel.

JP 2020-15532 A

In the case of the container as disclosed in Patent Document 1, the side walls (the pair of tilting panels and the pair of folding panels) may unintentionally fall inward in the assembled state.
The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a folding box and a box unit that suppress the side walls from collapsing inward. The present disclosure can be implemented as the following forms.

[1] A substantially rectangular plate-shaped bottom wall;
a first side wall, a second side wall, a third side wall, and a fourth side wall arranged to extend from each side of the bottom wall;
The first side wall and the third side wall are arranged to face each other,
The second side wall and the fourth side wall are arranged to face each other,
From an assembled state in which the first side wall, the second side wall, the third side wall, and the fourth side wall are erected with respect to the bottom wall,
The second side wall and the fourth side wall are respectively tilted inward, and the first side wall and the third side wall are each tilted inward to be in a folded state,
In the assembled state, both side end surfaces of the fourth side wall are sandwiched between a first inner surface on the inner side of the first side wall and a third inner surface on the inner side of the third side wall. supported by the side wall and the third side wall,
The folding box, wherein the first inner surface of the first side wall is provided with a restricting portion that restricts the fourth side wall from falling inward by interfering with the end portion of the fourth side wall in the assembled state. .

The folding box and box unit of the present disclosure restrain the side walls from falling inward.

It is a perspective view showing an example of the folding box of the first embodiment. FIG. 4 is an exploded view of a folding box; FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 4 is an enlarged view enlarging the vicinity of a regulation portion on the left side of FIG. 3; Fig. 2 is a cross-sectional view of the folding box of Fig. 1 as seen from the right side; 6 is an enlarged view enlarging the vicinity of a restricting portion on the side of a first side wall in FIG. 5; FIG. Fig. 10 is a perspective view of the folding box with the second side wall and the fourth side wall folded inward; Fig. 8 is a front cross-sectional view of the folding box of Fig. 7; Fig. 8 is a cross-sectional view of the folding box of Fig. 7 viewed from the right; 1 is a perspective view of a folding box in a folded state; FIG. FIG. 2 is a perspective view showing an example of a box unit of the first embodiment; FIG. 1 is a perspective view of a bag; FIG. FIG. 12 is a cross-sectional view of the box unit of FIG. 11 as seen from the left side; FIG. 12 is a partially enlarged cross-sectional view of the box unit of FIG. 11 as seen from above; FIG. 4 is a cross-sectional view of the box unit viewed from the right side when the folding box is in the folded state; FIG. 4 is a perspective view of the box unit in a folded state;

A preferred example of the present disclosure will now be presented.
[2] The restricting portion has elasticity,
The folding box is configured such that an elastic force of the restricting portion increases a force of sandwiching the fourth side wall between the first inner surface and the third inner surface.
[3] a folding box;
It has a box shape with an open top, and can be accommodated so as to cover the outer surfaces of the bottom wall, the first side wall, the second side wall, the third side wall, and the fourth side wall of the folding box in the assembled state. A box unit with a large bag and a
[4] The box unit, wherein the bag is provided with a reinforcing plate in a region facing the fourth side wall.
[5] The reinforcing plate has a first region that overlaps a side end face of the first side wall in the assembled state on the side of the fourth side wall, and the reinforcing plate has the third side wall in the assembled state. A box unit in which there is a second region that overlaps a side end face of the side wall on the side of the fourth side wall.
[6] the length in the wall thickness direction of the first side wall of the first region is 1/2 or more of the thickness of the first side wall in at least a part of the first region;
The box unit, wherein the length in the wall thickness direction of the third side wall of the second region is 1/2 or more of the thickness of the third side wall in at least a part of the second region.
[7] The box unit, wherein the lower end of the reinforcing plate is arranged above the upper end of the folding box in the folded state.

[First embodiment]
The first embodiment of the present disclosure will be described in detail below. In the following description of the box unit, the left-right direction and the up-down direction are the left-right direction and the up-down direction in FIGS. The front side and the rear side are the front side and the back side in FIGS. 1, 7, 10 to 12, and 16, respectively. In this specification, the description using "-" for the numerical range includes the lower limit and the upper limit unless otherwise specified. For example, the description “10 to 20” includes both the lower limit “10” and the upper limit “20”. That is, "10 to 20" has the same meaning as "10 or more and 20 or less".

1. folding box 1
The folding box 1 is used as a cold storage box or the like that keeps the articles housed inside in a cold state. The folding box 1 changes between an assembled state and a folded state. As shown in FIG. 1, the folding box 1 is in the shape of a hollow container that opens upward in the assembled state.

The folding box 1 comprises a bottom wall 3, a first side wall 10, a second side wall 20, a third side wall 30 and a fourth side wall 40, as shown in FIGS. The bottom wall 3 has a substantially rectangular plate shape. A rectangle means a parallelogram. Specifically, the bottom wall 3 is rectangular in plan view.

In the assembled state of the folding box 1, as shown in FIG. 54 (see FIG. 2). The first side wall 10 and the third side wall 30 are arranged to face each other. In the assembled state of the folding box 1, the wall surface of the first side wall 10 and the wall surface of the third side wall 30 face each other in the front-rear direction. The second side wall 20 and the fourth side wall 40 are arranged to face each other. In the assembled state of the folding box 1, the wall surface of the second side wall 20 and the wall surface of the fourth side wall 40 face each other in the left-right direction.

The 1st side wall 10 has the upper wall part 11 and the base part 12, as shown in FIG. The pedestal portion 12 has a rectangular plate shape elongated in the left-right direction. The pedestal portion 12 rises from the side edge 51 of the bottom wall 3 . The upper wall portion 11 has a rectangular plate shape elongated in the left-right direction. The upper wall portion 11 is tiltably connected to the base portion 12 via a hinge 13 . The upper wall portion 11 changes between a state in which it stands up with respect to the pedestal portion 12 and a state in which it falls inward (front side).

As shown in FIGS. 1 and 2, the second side wall 20 has a rectangular plate shape elongated in the front-rear direction. The second side wall 20 is tiltably connected to the bottom wall 3 via a hinge 21 (see FIG. 3). The second side wall 20 changes between a state in which it stands up against the bottom wall 3 and a state in which it falls inward (to the left).

The 3rd side wall 30 has the upper wall part 31, the base part 32, and the hinge 33, as shown in FIG. The upper wall portion 31 , the pedestal portion 32 and the hinge 33 have the same configuration as the upper wall portion 11 , the pedestal portion 12 and the hinge 13 of the first side wall 10 . The upper wall portion 31 changes between a state in which it stands up with respect to the pedestal portion 32 and a state in which it falls inward (rear side).

As shown in FIG. 1, the fourth side wall 40 is tiltably connected to the bottom wall 3 via a hinge 41 (see FIG. 3). The fourth side wall 40 has the same configuration as the second side wall 20 . The fourth side wall 40 changes between a state in which it stands up against the bottom wall 3 and a state in which it falls inward (to the right).

In the assembled state of the folding box 1, as shown in FIG. From the assembled state, the folding box 1 is brought into the folded state shown in FIG. 10 by tilting the second side wall 20 and the fourth side wall 40 inward, and tilting the first side wall 10 and the third side wall 30 inward. can.

Each wall of the folding box 1 (the bottom wall 3, the first side wall 10, the second side wall 20, the third side wall 30, and the fourth side wall 40) is not shown, but is composed of, for example, a core material, a sheet material, It has The core material is made of a heat insulating material such as polyurethane foam, polystyrene foam, or foamed rubber, or plastic corrugated cardboard. The sheet material is composed of a sheet member having functions such as flexibility, heat insulation, and light shielding, such as an aluminum-deposited plastic sheet. Each wall (the bottom wall 3, the first side wall 10, the second side wall 20, the third side wall 30, and the fourth side wall 40) is configured by the sheet material covering the outer surface of the core material. The bottom wall 3 and the side walls 10, 20, 30, 40 are connected by directly or indirectly combining sheet materials by sewing. In addition, the structure which shares one sheet member between each wall part (bottom wall 3, the 1st side wall 10, the 2nd side wall 20, the 3rd side wall 30, and the 4th side wall 40) may be sufficient.

Each side wall (first side wall 10, second side wall 20, third side wall 30, and fourth side wall 40) is configured to be biased toward the bottom wall 3 without contacting the other side walls. be. The hinges 13, 21, 33, 41 are composed of sewn seams, for example. By providing sewn seams, each side wall is biased to collapse inward.

In the assembled state of the folding box 1, as shown in FIG. and the first inner surface 14 on the inner side of the . Therefore, the second side wall 20 is supported by the first side wall 10 and the third side wall 30 . Both side end faces (front end face 42 and rear end face 43 ) of the fourth side wall 40 are sandwiched between the third inner face 34 inside the third side wall 30 and the first inner face 14 inside the first side wall 10 . Therefore, the fourth side wall 40 is supported by the first side wall 10 and the third side wall 30 .

The folding box 1 is provided with restricting portions 61, 62, 63, and 64, as shown in FIGS. The fourth side wall 40 is regulated from falling inward by the contact of the regulating portions 61 and 63 against the fourth side wall 40 . The second side wall 20 is regulated from falling inward by the contact of the regulating portions 62 and 64 with the second side wall 20 . The restricting portions 61, 62, 63, 64 are elastic members. The restricting portions 61, 62, 63, 64 are hook-and-loop fasteners. The regulating portions 61, 62, 63, 64 are female type loop surface fasteners (having a densely raised loop shape). The restricting portions 61, 62, 63, 64 are, for example, New Ecomagic (registered trademark) B2790Y. 00 (width 25-50 mm, made of polyester) is used. The lengths of the restricting portions 61, 62, 63, 64 are, for example, 50 to 115 mm. The loop-shaped bristles of the restricting portions 61, 62, 63, 64 are elastically deformed. The rear surfaces of the regulating portions 61 , 62 , 63 , 64 (surfaces opposite to the surfaces that are raised in a loop shape) are attached to the folding box 1 .

As shown in FIGS. 1 to 3, the restricting portions 61 and 62 are provided on the first inner surface 14 of the first side wall 10 so as to extend vertically. As shown in FIGS. 3 and 4, the left portion of the restricting portion 61 is provided on the first inner surface 14 so as to overlap the fourth side wall 40 in the front-rear direction when the folding box 1 is assembled. The upper end of the restricting portion 61 is positioned, for example, 25 mm below the upper end of the first inner surface 14 . As shown in FIGS. 5 and 6, the left end side of the restricting portion 61 is sandwiched between the first side wall 10 and the fourth side wall 40 in the assembled state. The restricting portion 61 interferes with the end portion (rear end portion 45 ) of the assembled fourth side wall 40 to restrict the fourth side wall 40 from falling inward. When the fourth side wall 40 and the restricting portion 61 interfere with each other, the rear end portion 45 elastically deforms the loop-shaped bristles of the restricting portion 61 . The elastic force of the restricting portion 61 increases the force with which the first inner surface 14 of the first side wall 10 and the third inner surface 34 of the third side wall 30 sandwich the fourth side wall 40 .

The restricting portion 62 is provided on the first inner surface 14 of the first side wall 10 so as to extend in the vertical direction. As shown in FIGS. 3 and 4, the right portion of the restricting portion 62 is provided on the first inner surface 14 so as to overlap the second side wall 20 in the front-rear direction when the folding box 1 is assembled. The upper end of the restricting portion 62 is positioned, for example, 25 mm below the upper end of the first inner surface 14 . The restricting portion 62 is sandwiched between the first side wall 10 and the second side wall 20 in the assembled state. The restricting portion 62 interferes with the end portion (rear end portion 25) of the second side wall 20 in the assembled state, thereby restricting the second side wall 20 from falling inward. The elastic force of the restricting portion 62 increases the force with which the first inner surface 14 of the first side wall 10 and the third inner surface 34 of the third side wall 30 sandwich the second side wall 20 .

As shown in FIGS. 1 and 2, the restricting portions 63 and 64 are provided on the third inner surface 34 of the third side wall 30 so as to extend vertically. The regulating portions 63 and 64 are provided on the third inner surface 34 in the same arrangement as the regulating portions 61 and 62 with respect to the first inner surface 14 . The restricting portion 63 is sandwiched between the first side wall 10 and the fourth side wall 40 in the assembled state. The restricting portion 63 interferes with the end portion (front end portion 44) of the fourth side wall 40 in the assembled state, thereby restricting the fourth side wall 40 from falling inward. The elastic force of the restricting portion 63 increases the force of sandwiching the fourth side wall 40 between the first inner surface 14 of the first side wall 10 and the third inner surface 34 of the third side wall 30 .

The restricting portion 64 is sandwiched between the third side wall 30 and the second side wall 20 in the assembled state. The restricting portion 64 interferes with the end portion (the front end portion 24) of the assembled second side wall 20 to restrict the second side wall 20 from falling inward. The elastic force of the restricting portion 64 increases the force with which the first inner surface 14 of the first side wall 10 and the third inner surface 34 of the third side wall 30 sandwich the second side wall 20 .

2. Folding Procedure and Assembling Procedure of Folding Box 1 The folding procedure of the folding box 1 will be described with reference to FIGS. 7 to 10. FIG. First, in the assembled folding box 1, as shown in FIGS. 7 to 9, the second side wall 20 and the fourth side wall 40 are folded inward. The second side wall 20 is regulated from falling inward by coming into contact with the regulating portions 62 and 64 . The fourth side wall 40 is restricted from falling inward by coming into contact with the restriction portions 61 and 63 . As the second side wall 20 is tilted, the contact with the restricting portions 62 and 64 is released and the second side wall 20 is further tilted inward. When the fourth side wall 40 is tilted, the contact with the restricting portions 61 and 63 is released and the fourth side wall 40 is further tilted inward.

Subsequently, as shown in FIG. 10, the first side wall 10 and the third side wall 30 are turned inward. The upper wall part 11 is tilted forward with respect to the pedestal part 12.例文帳に追加The upper wall portion 31 is tilted rearward with respect to the pedestal portion 32. - 特許庁As described above, the folding box 1 is folded. When the folding box 1 is changed from the folded state to the assembled state, the folding procedure is reversed.

3. box unit 5
The box unit 5 includes a folding box 1 and a bag 7, as shown in FIG. Folding box 1 is housed in bag 7 . The inner surface of bag 7 is in contact with the outer surface of folding box 1 . The inner surface of the bag 7 (the upper surface of the bottom portion 9) is in contact with the lower surface of the folding box 1 (the lower surface of the bottom wall 3). The bag 7 is made of a sheet material having various functions such as airtightness, heat insulation, and water repellency. The bag 7 is formed by sewing a sheet material so as to have a rectangular parallelepiped box shape that is open upward. The sheet material has a multi-layer structure in which, for example, films or woven fabrics of synthetic resins such as polyethylene terephthalate, polyester, and polyethylene, and layers of metals such as aluminum are laminated.

The bag 7 accommodates the assembled folding box 1, as shown in FIG. The bag 7 covers the outer surfaces of the bottom wall 3 , the first side wall 10 , the second side wall 20 , the third side wall 30 and the fourth side wall 40 . The bag 7 has a bottom 9, a first side 71, a second side 72, a third side 73 and a fourth side 74, as shown in FIG. The bottom portion 9 has a substantially rectangular shape. A first side portion 71 , a second side portion 72 , a third side portion 73 and a fourth side portion 74 extend from each side of the bottom portion 9 . The first side portion 71, the second side portion 72, the third side portion 73, and the fourth side portion 74 are continuous in the circumferential direction. A corner patch cloth (not shown) or the like may be provided at the corners between the sides. Bottom 9 , first side 71 , second side 72 , third side 73 and fourth side 74 are defined by bottom wall 3 , first side wall 10 , second side wall 20 , third side wall 30 and respectively. It covers each outer surface of the fourth side wall 40 .

The bag 7 is provided with a pair of handles 75, as shown in FIG. The handle 75 is made of acrylic tape, for example. A pair of handles 75 are provided on the outer surface of the second side portion 72 and the outer surface of the fourth side portion 74 via reinforcing bands 76, respectively. The reinforcement band 76 is configured by, for example, a polypropylene belt. Each reinforcement band 76 is sewn on the outer surfaces of the second side portion 72 and the fourth side portion 74 so as to extend in the front-rear direction. Both ends of the reinforcement band 76 are sewn together with the sheet material together with corner patch cloths provided at the corners between the sides. The handle 75 and the reinforcing band 76 on the right side are provided at positions overlapping the reinforcing plate 90 with the second side portion 72 interposed therebetween. The left handle 75 and the reinforcing band 76 are provided at positions overlapping the reinforcing plate 80 via the fourth side portion 74 .

As shown in FIG. 12, the bag 7 is provided with a plurality of female-type (loop-shaped densely raised structure) or male-type (hook-shaped densely raised structure) hook-and-loop fasteners 77 . there is Although not shown, an opposite type of hook-and-loop fastener corresponding to each hook-and-loop fastener 77 is provided on the folding box 1 .

As shown in FIGS. 11 and 12, a reinforcing plate 80 is provided in a region facing the fourth side wall 40 (inner surface of the fourth side portion 74). The reinforcing plate 80 is made of resin and has rigidity. The reinforcing plate 80 has a substantially rectangular plate shape elongated in the front-rear direction. The thickness of the reinforcing plate 80 is, for example, 1.0 to 2.0 mm. The length of the reinforcing plate 80 in the front-rear direction is slightly smaller than the length of the fourth side portion 74 in the front-rear direction. The reinforcing plate 80 is fixed, for example, to the inner surface of the fourth side portion 74 via an adhesive. One entire surface of the reinforcing plate 80 is adhered to the inner surface of the fourth side portion 74 .

As shown in FIGS. 13 and 14, the reinforcing plate 80 has a first region AR1 that overlaps the side end surface 15 of the assembled first side wall 10 on the side of the fourth side wall 40 . The first area AR1 is the rear end of the reinforcing plate 80. As shown in FIG. The reinforcing plate 80 has a second region AR2 that overlaps the side end face 35 of the assembled third side wall 30 on the side of the fourth side wall 40 . The second area AR2 is the front end of the reinforcing plate 80. As shown in FIG. By overlapping the reinforcing plate 80 with the first side wall 10 and the third side wall 30, it is possible to prevent the fourth side wall 40 from falling inward.

As shown in FIG. 14, the length R1 of the first region AR1 in the front-rear direction (wall thickness direction of the first side wall 10) is 1/2 or more of the first side wall thickness W1. R1 is, for example, 10 mm to 20 mm. A length R2 of the second region AR2 in the front-rear direction (thickness direction of the third side wall 30) is 1/2 or more of the third side wall thickness W3. R2 is, for example, 10 mm to 20 mm. Since the reinforcing plate 80 and the first side wall 10 and the third side wall 30 are sufficiently lapped, it becomes easy to suppress the fourth side wall 40 from falling inward.

As shown in FIG. 15, the lower end 81 of the reinforcing plate 80 is arranged above the upper end 1A of the folding box 1 in the folded state. The upper end 1A of the folding box 1 is the lower end 11A (uppermost in FIG. 15) of the upper wall portion 11 in the fallen state and the lower end 31A (uppermost in FIG. 15) of the upper wall portion 31 in the fallen state.

As shown in FIGS. 11 and 12, a reinforcing plate 90 is provided in a region facing the second side wall 20 (the inner surface of the second side portion 72). The reinforcing plate 90 has a configuration similar to that of the reinforcing plate 80 . The reinforcing plate 90 is provided on the second side portion 72 in the same arrangement as the reinforcing plate 80 with respect to the fourth side wall 40 . Therefore, description of the reinforcing plate 90 is omitted.

4. Folding Procedure and Assembling Procedure of Box Unit 5 A folding procedure of the box unit 5 will be described with reference to FIGS. 15 and 16. FIG. First, the assembled folding box 1 is folded (see FIG. 10). The folding procedure of the folding box 1 is as described above. Subsequently, as shown in FIG. 16, the bag 7 is folded inside. For example, the bag 7 is provided with a planned folding line in advance, and is folded along the planned folding line. Specifically, after the first side portion 71 and the third side portion 73 have fallen inward, the second side portion 72 and the fourth side portion 74 have fallen inward. At this time, since the lower end 81 of the reinforcing plate 80 is arranged above the upper end 1A of the folding box 1, the bag 7 is folded without the reinforcing plate 80 and the folding box 1 interfering with each other. When the box unit 5 is changed from the folded state to the assembled state, the folding procedure is reversed.

5. Effects of First Embodiment Effects of the folding box 1 and the box unit 5 will be described. Although the effect of the restricting portion 61 will be described below, the same effect is produced by the restricting portions 62, 63, and 64 as well. Moreover, although the effect of the reinforcing plate 80 will be described below, the reinforcing plate 90 also produces the same effect.

The folding box 1 has a restricting portion 61 . Therefore, the fourth side wall 40 is prevented from falling inward due to contact with the restricting portion 61 .

The folding box 1 is configured such that the elastic force of the restricting portion 61 increases the force with which the fourth side wall 40 is sandwiched between the first inner surface 14 and the third inner surface 34 . Thereby, it is possible to further prevent the fourth side wall 40 from falling inward.

The box unit 5 has a bag 7 capable of accommodating the folding box 1. - 特許庁The inner surface of bag 7 is in contact with the outer surface of folding box 1 . The inner surface of the bag 7 (the upper surface of the bottom portion 9) is in contact with the lower surface of the folding box 1 (the lower surface of the bottom wall 3). As a result, deformation of the bag 7 is suppressed, and it is possible to suppress falling inward.

The bag 7 is provided with a reinforcing plate 80 in a region (fourth side portion 74) facing the fourth side wall 40. As shown in FIG. Thereby, the fourth side portion 74 of the bag 7 can be reinforced.

The reinforcing plate 80 has a first region AR1 overlapping with the side end surface 15 of the first side wall 10 and a second region AR2 overlapping with the side end surface 35 of the third side wall 30 . As a result, the reinforcing plate 80 is supported by the first side wall 10 and the third side wall 30, so that the effect of reinforcing the fourth side portion 74 of the bag 7 can be enhanced.

A length R1 of the first region AR1 in the front-rear direction (wall thickness direction of the first side wall 10) is 1/2 or more of the first side wall thickness W1. A length R2 of the second region AR2 in the front-rear direction (thickness direction of the third side wall 30) is 1/2 or more of the third side wall thickness W3. As a result, a large portion of the first side wall 10 and the third side wall 30 that supports the reinforcing plate 80 can be secured, and the effect of supporting the reinforcing plate 80 can be enhanced.

Since the bag 7 is provided with a pair of handles 75, it is configured such that force is likely to be applied to the second side wall 20 and the fourth side wall 40 from the outside. In such a configuration, the reinforcement of the bag 7 (the fourth side portion 74 and the second side portion 72) by the reinforcing plates 80 and 90 allows the bag 7 (the fourth side portion 74 and the second side portion 72) to move toward the second side. (4) It is possible to make it difficult to apply force to the side wall 40 and the second side wall 20 .

The lower end 81 of the reinforcing plate 80 is arranged above the upper end 1A of the folding box 1 in the folded state. As a result, when the bag 7 is folded, the reinforcing plate 80 and the folding box 1 are less likely to interfere with each other, and the bag 7 can be folded satisfactorily.

6. Other Embodiments The present disclosure is not limited to the first embodiment detailed above, and various modifications or changes are possible.
In the first embodiment, the restricting portions 61, 62, 63, 64 are provided on the folding box 1 so as to extend vertically, but the arrangement is not limited to this. For example, the restricting portions 61, 62, 63, and 64 may be arranged so as to extend in the left-right direction, or may be arranged so as to be inclined with respect to the up-down direction.
In the first embodiment, one end side of the restricting portions 61, 62, 63, 64 in the left-right direction is sandwiched between the first side wall 10 and the fourth side wall 40. It may be configured to be
In the first embodiment, the restricting portions 61, 62, 63, 64 are band-shaped, but the shape is not limited to this.
In the first embodiment, the restricting portions 61, 62, 63, and 64 are loop surface fasteners, but may be other members (rubber pieces, etc.) as long as they have elasticity.
In the first embodiment, both ends of the fourth side wall 40 are sandwiched between the restricting portions 61 and 63, but only one of the restricting portions 61 and 63 may be provided.
In the above-described first embodiment, the restricting portions 61 and 62 may be provided so as to straddle the upper wall portion 11 and the base portion 12 . Similarly, the restricting portions 63 and 64 may be provided so as to straddle the upper wall portion 31 and the pedestal portion 32 .
In the above-described first embodiment, the restricting portions 61, 62, 63, 64 may be in the form of double layered female type hook-and-loop fasteners. If the surface of one hook-and-loop fastener (the side where the loop-shaped bristles are exposed) is in contact with the fourth side wall 40 or the second side wall 20, the surfaces may be stacked in the same direction or in the opposite direction. You can stack them so that the
In the first embodiment, the reinforcing plate 80 may overlap only one of the first side wall 10 and the third side wall 30 . Similarly, the reinforcing plate 90 may overlap only one of the first side wall 10 and the third side wall 30 .
In the first embodiment described above, the length R1 in the front-rear direction of the first region AR1 of the reinforcing plate 80 may be 1/2 or less of the first side wall thickness W1. Similarly, the length R2 of the second region AR2 in the front-rear direction may be 1/2 or less of the third sidewall thickness W3. The reinforcing plate 90 may also have a similar configuration.
In the above-described first embodiment, the length R1 is 1/2 or more of the first sidewall thickness W1 in the entire vertical direction of the first region AR1 of the reinforcing plate 80, but a part of the vertical direction (for example, the upper portion etc.) may be 1/2 or more of the first sidewall thickness W1. As for the second region AR2 of the reinforcing plate 80, a part in the vertical direction (for example, the upper portion) may be 1/2 or more of the third side wall thickness W3. The reinforcing plate 90 may also have a similar configuration.
In the above-described first embodiment, the lower surface of the bottom portion 9 of the bag 7 may be provided with a protrusion having the same shape as the opening of the folding box 1 . When a plurality of box units 5 are stacked, the projection fits into the opening of the lower folding box 1, so that the box units 5 can be easily stacked and space can be saved.

Reference Signs List 1 ... folding box 1A ... upper end 3 ... bottom wall 5 ... box unit 7 ... bag 10 ... first side wall 11A ... lower end 14 ... first inner surface 15 ... side end surface 20 ... second side wall 30 ... third side wall 34 ... third inner surface 35... Side end face 40... Fourth side wall 43... Rear end face 45... Rear end portions 51, 52, 53, 54... Side sides 61, 62, 63, 64... Regulating portion 80... Reinforcing plate 81... Lower end AR1... First Area AR2 ... second area

Claims (6)

a substantially rectangular plate-shaped bottom wall;
a first side wall, a second side wall, a third side wall, and a fourth side wall arranged to extend from each side of the bottom wall;
The first side wall and the third side wall are arranged to face each other,
The second side wall and the fourth side wall are arranged to face each other,
From an assembled state in which the first side wall, the second side wall, the third side wall, and the fourth side wall are erected with respect to the bottom wall,
The second side wall and the fourth side wall are respectively tilted inward, and the first side wall and the third side wall are each tilted inward to be in a folded state,
In the assembled state, both side end surfaces of the fourth side wall are sandwiched between a first inner surface on the inner side of the first side wall and a third inner surface on the inner side of the third side wall. supported by the side wall and the third side wall,
The first inner surface of the first side wall is provided with a restricting portion that restricts the fourth side wall from falling inward by interfering with an end portion of the fourth side wall in the assembled state,
The regulating portion is separate from the first side wall and the fourth side wall, and is sandwiched between the first inner surface of the first side wall and the end surface of the fourth side wall in the assembled state. . 2. The folding box of claim 1, wherein said first, second, third and fourth sidewalls are configured to be biased to collapse inwards . At least one of the bottom wall, the first side wall, the second side wall, the third side wall, and the fourth side wall comprises a core material and a sheet material. folding box as described in . 4. The folding box according to any one of claims 1 to 3, wherein both side edges of the fourth side wall are flat throughout . 5. The folding box according to any one of claims 1 to 4, which is an insulated box. A folding box according to any one of claims 1 to 5 ;
It has a box shape with an open top, and can be accommodated so as to cover the outer surfaces of the bottom wall, the first side wall, the second side wall, the third side wall, and the fourth side wall of the folding box in the assembled state. A box unit with a large bag and a

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