JPH0986531A - Folding returnable case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strong folding returnable case that can be used repetitiously by virtue of its foldability. SOLUTION: Side plates 13 and 12 on the right and left are bent inward, and a front plate 14 is overlapped on a back plate 15 with the side plates 13 and 12 on the right and the left and the bottom flaps 172, 173, 174 and 175 placed in between, and top plates 16 connecting to the upper and the lower parts of the back plate 15 are bent and overlapped on the front plate 14. Thereby, the case can be folded up approximately in a thickness of four to five sheets of plate and in a size equivalent to the front plate 14 and the back plate 15. Therefore, the volume of the case when fabricated in a cubical shape can be reduced by folding up into an extremely compact flat-plate shape, and convenience of portability can be achieved to its utmost. As it can be used repetitiously, the case can be accommodative to use as a returnable container for regular transportation of goods.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sturdy foldable carrying box that can be repeatedly used by folding.

[0002]

2. Description of the Related Art With the spread of courier services, a mail-order system for individuals to purchase goods directly from manufacturers or production areas is being developed. Not only such an online shopping system, but also a container used for packaging an article is required to be lightweight and durable, and a corrugated box is generally used. The cardboard box 1 shown in FIG. 7 is a typical cardboard box that is discarded once it is used in the distribution process. This cardboard box includes a front plate 2, a rear plate 3, left and right side plates 4, which define a packaging space.
Foldable flaps 6 are provided at both ends of the flap 5, and the flaps 6 are folded to close the upper opening and the lower opening of the packaging space.

[0003]

[Problems to be Solved by the Invention] Conventional cardboard box 1
When the front plate 2 and the back plate 3 and the side plates 4 and 5 that define the packaging space are folded, they are transformed into a diamond shape as shown in FIG. 2 and the side plate 4 (or the back plate 3 and the side plate 5) are only small in area, which is very difficult to carry. Further, after the flaps 6 are folded to cover the top opening or the bottom opening, the flaps 6 need to be fixed to each other, and the overlapping portions of the flaps must be bound with staples (binding needles) or the like. For this reason, a stapler (binding machine) is indispensable, and a cardboard box used once 1
However, there are problems that the bound portion is easily broken when the staple is removed and folded, and many of them cannot withstand repeated use.

On the other hand, in place of such a waste cardboard box, a so-called returnable box which can be repeatedly used is used. Such a returnable box must satisfy the following conditions. That is, the condition is
It is possible to store a set of folded boxes in a box in a box-raised state, and use the box in a box-raised state to return or store a plurality of boxes for the next use.
However, in most conventional returnable boxes, when the folded box is stored in the folded box, the folded box often plays in the folded box, causing a slight impact. There was a problem that the box to be stored (folded box) would easily pop out and fall apart even if it was added.

Therefore, it is an object of the present invention to provide a returnable box which can be repeatedly used and which satisfies the above-mentioned conditions, that is, a foldable storage box, rather than the conventional waste cardboard box.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a pair of left and right side plates that can be folded inward along a central vertical cut line, a front plate and a back plate connected through the pair of side plates, In a box-raised state, which is openably and closably connected to the upper edge of the back plate and extends the pair of side plates in a flat plate shape so that the front plate and the back plate face each other at a distance, while covering the top opening, In a folded state in which the side plate is folded inward along the central vertical cut line and the front plate and the back plate are aligned with the side plate sandwiched therebetween, a top plate that is folded over the front plate and the front plate. Bottom flaps that are openably and closably connected to the lower edges of the side plate and the back plate, cover the bottom opening in the box-raised state, and fold over the front plate, the side plate, and the back plate in the folded state, respectively. Means and By providing a foldable returnable box characterized by Bei, it is to achieve the above object.

Further, according to the present invention, the bottom plate is provided so as to be openable and closable along the lower edge of the back plate. In the state, it is equipped with a bottom surface reinforcing plate into which the side surface plate is folded after being stacked on the back surface plate, or among the bottom surface flap means, a bottom surface flap connected to the front surface plate and a bottom surface connected to one side surface plate. The flap is partially adhered, and the bottom flap connected to the back plate and the bottom flap connected to the other side plate are partly adhered to each other, and the bottom opening is closed by combining the flaps with the box-like shape when raising the box. Alternatively, the front plate and the side plate have a height that exceeds the height of the box at the time of packing, and the portion from the upper edge to the height of the box at the time of packing has a top opening at the top plate. When closing the Folded on the side, by providing a foldable returnable box characterized by the like constituting the folding flaps for receiving the peripheral edge of the upper plate, is intended to achieve the above object.

Further, the front plate and the back plate are slightly curved in the folded state, and the shortened width dimension due to the bending causes the inner width dimension in the box-raised state and the outer width dimension in the folded state to be substantially the same. The object is achieved by providing a collapsible carton that is characterized in that it matches.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing an embodiment of a foldable carrying box of the present invention, FIG.
1 is an exploded view showing the folding type returnable box shown in FIG. 1 by disassembling it into three blocks, and FIGS. 3 to 6 are steps for assembling the folding type returnable box shown in FIG. 1 from a folded state to a raised state. FIG.

The foldable returnable box 11 shown in FIG. 1 is shown in a state of being laid sideways with the back side down for convenience of description, but a pair of left and right sides which can be folded inward along the central vertical section line Lc. The front plate 14 and the rear plate 15 are connected by the face plates 12 and 13, the upper plate 16 is connected to the upper edge portion of the rear plate 15, and the bottom flap 172 is connected to the lower edge portions of the respective plates 12, 13, 14, and 15. 173, 174, and 175 are openably and closably connected, and a bottom surface reinforcing plate 18 is openably and closably provided inside the bottom surface flap 175 along the lower edge of the back plate 15. Foldable carrying box 11
2 can be made into a flat folded state by folding the left and right side plates 12 and 13 inward along the central vertical disconnection line Lc. 3 blocks B of special shape shown in
It is configured by combining 1, B2 and B3. The first block B1 is configured by connecting the side plate 12 with the bottom flap 172 to the side edge of the front plate 14 with the bottom flap 174 so that the side plate 12 can be bent and folded up freely.
2, the upper plate 16 is foldably connected to the rear plate 15 having the bottom flap 175, and the side plate 13 with the bottom flap 173 is foldably connected to the side edge of the rear plate 15. The third block B3 is the bottom surface reinforcing plate 18 itself for reinforcing the bottom surface flaps 172 to 175.

By the way, the first block B1 is the front plate 1
Bottom flaps 174 and 172 on the lower edge side of both 4 and the side plate 12
Outside, the folding flaps 14a and 12a are attached to the upper edge, and the folding line L is formed at the boundary between these folding flaps 14a and 12a and the main body. Further, the front plate 14 is provided with a tongue portion insertion hole 14c having a shape of a combination of a semicircle and a horizontal line at substantially the center of the folding line L. The side plate 12 is adapted to be folded inward along the central longitudinal line Lc, and a folding line Li extending from the intersection of the joint with the front plate 14 and the folding line L to the edge at an angle of 45 degrees is formed. is there. A substantially rectangular glue margin portion 12b is formed on the side edge of the side plate 12, and the glue margin portion 12b is glued and adhered to the corresponding glue margin portion (a) of the back plate 15. Reference numeral 12c is a finger insertion hole formed on the side plate 12 in place of a handle, and is used to hang up and lift the finger of the left hand when the returnable case 11 is assembled in a raised state.

The bottom flap 174 of the front plate 14
2 is glued to a portion adjacent to the bottom flap 172 of the side plate 12 with a triangular portion 174b having a satin pattern shown in FIG. 2, whereby when the folding returnable box 11 is raised from the folded state to the box, One flap 1
74 and 172 cooperate with each other to form one bottom flap.

In the second block B2, the back plate 15 and the side plate 13 are provided with folding flaps 15a, 13a on the upper edge of the bottom edge flaps 175, 173 on the lower edge side, and these folding flaps 15a, 13a. A folding line L is formed at the boundary of the main body. Further, an upper plate 16 is connected to the rear plate 15 at the upper edge of the folding flap 15a. The upper surface plate 16 is processed by folding back and adhering the shaded portion in FIG. 2, and thereby a tongue portion 16c to be inserted into the tongue portion insertion hole 14c of the front plate 14 is formed at the center of the upper edge portion thereof. It On the other hand, on the bottom surface side of the rear plate 15, there is formed a glue margin portion (c) for gluing and adhering the gluing portion 18b of the bottom surface reinforcing plate 18. The side plate 13 is adapted to be folded inward along the central longitudinal line Lc, and a folding line Li extending from the intersection of the joint with the back plate 15 and the folding line L to the edge at an angle of 45 degrees is formed. is there. In addition, the side edge of the side plate 13 has a rectangular margin 13
b is formed, and this glue margin portion 13b is glued and adhered to the corresponding glue margin portion (b) of the front plate 14. The margin portion 13b is
It is divided by the folding line L, and a folding line Li extending obliquely 45 degrees from the dividing point toward the upper edge of the folding flap 13a is formed. 13c is a side plate 1
It is a finger-pointing hole instead of a handle formed in 3
Used to hang and lift the fingers of the right hand when assembled in a box-raised state.

The bottom flap 175 of the rear plate 15
2 is glued to the adjacent portion of the bottom surface flap 173 of the side plate 13 with a triangular portion 175b having a satin pattern in FIG. 2, so that when the folding returnable box 11 is raised from the folded state to the box, One flap 1
75 and 173 cooperate with each other to form one bottom flap. Further, the contour line formed by the two flaps 175, 173 partially adhered in the block B2 and the contour line formed by the two flaps 174, 172 partially adhered in the block B1 are formed by raising the box. The bottom surfaces of the returnable boxes 11 which are combined in a shape and raised by the combination are sealed in a closed state with a certain strength without being stuck together with an adhesive tape or the like.

In the three blocks B1, B2, B3, the glue margin portion 18b of the third block B3 is first glued to the glue margin portion (c) of the second block B2, and then the glue margin portion 12b of the first block B1. Is glued to the glue margin portion (a) of the second block B2. Further, the glue margin portion 13b of the second block B2 is formed in the first block B so as to define a storage space that opens vertically.
Glue and glue to the glue margin part (b) of 1. Finally, the four bottom surface flaps 172, 173, 174, and 175 are folded inward, the triangular portions 174b and 175b are glued and bonded, and the four bottom surface flaps 172 to 175 are combined into a swastika shape. In this way, the completed folding carton 11
Can be folded in a state where the bottom surface reinforcing plate 18 is overlapped with the back plate 15, and the side plates 12 and 13 are folded inward along the central vertical cut line Lc to form the back plate 16,
The bottom reinforcing plate 18, the side plates 12 and 13, and the front plate 14 are sequentially stacked from the bottom to the top and folded, and finally the top plate 16 is folded on the front plate 14 to be flattened to the minimum volume. . The four bottom surface flaps 172 to 175 are the bottom surface flaps 172 and 173 attached to the side surface plates 12 and 13.
Is folded along the central vertical line Lc,
Bottom flaps 174 attached to the front plate 14 and the back plate 15
175 is stacked on the front plate 14 and the bottom reinforcing plate 18 with the triangular portions 174b and 175b folded back. In addition, the top plate 16 folded on the front plate 14
Overlaps the front plate 14 by leaving a length equivalent to twice the height of the folding flap 15a, but in reality, the folding margin (high height) is equal to the thickness of several sheets stacked on the back plate 15. Since the height H) is provided, the covering length of the front plate 14 by the upper plate 16 becomes shorter by that amount.

Further, the front plate 14 and the rear plate 16 are slightly curved in the folded state, and the width dimension Ws (shown in FIG. 5) in the box-raised state and the outer dimension in the folded state due to the shortening of the width dimension accompanying the bending. The width dimension Wf (shown in FIG. 3) substantially coincides with each other, so that the folding box 11 can be accommodated in the folding box 11 without difficulty as described later. Also, the outer width Ws in the box-raised state
Difference dW between + dW and outer width Ws in folded state
Is borne by the curvature of the front plate 14 and the back plate 16, but in reality, the front plate 14, the back plate 16 and the side plates 12, 1
The shortening by several mm due to the rounding of each joint part of 3 also partially contributes. However, since the curvature of the front plate 14 and the back plate 16 differs depending on the V-shapedness of the side plates 12 and 13 that are folded in two, the folding box 11 can be accommodated in the folding box 11 without any difficulty. It can be said that there is almost no problem even if the main factor of this is the curvature of the front plate 14 and the back plate 16.

By the way, when the folded returnable box 11 is used by raising it, the upper surface plate 16 folded on the front plate 14 is first opened as shown in FIG. State. Next, as shown in FIG. 4, the upper surface plate 16 is pulled up to erect the side surface plates 12 and 13.
At this time, the four bottom surface flaps 172 to 175 are combined in a swastika shape to close the bottom surface. Next, the bottom surface reinforcing plate 18 which has been stacked on the back plate 15 until then is stacked on the bottom surface flaps 172 to 175, and the box is raised in the state shown in FIG. Further, as shown in FIG. 6, the three sheets 12a, 13a, 14a excluding the back plate side are folded inward along the folding line L to form an edge for receiving the peripheral edge of the top plate 16. In this case, the ends of the folding flaps 13a and 14a are folded in a fold shape along the 45-degree folding line Li. Finally, the top plate 16 is folded back, the tongue portion 16c is inserted into the tongue portion insertion hole 14c as shown in FIG. 1, and the bottom face flap 17 is locked to the front plate 14 so as not to come off, and the packing is completed.

As described above, according to the foldable storage box 11, the left and right side plates 12, 13 are folded inward, and the front plate 14 is inserted into the rear plate 15 via the left and right side plates 12, 13.
And the upper surface plate 16 and the bottom surface flap 17 which are connected to the upper and lower sides of the rear plate 15 are folded and overlapped on the front plate 14, so that the thicknesses of 4 to 5 thick plates are vertically overlapped. The front plate 14 and the rear plate 1 are suppressed and have a flat area.
It can fit in the same size as 5. Therefore, the volume when assembled in a three-dimensional shape can be folded into a flat plate shape in the most compact form. Further, since the foldable returnable container 11 can be repeatedly used, it is possible to provide a returnable container suitable for periodical product transportation.

Further, since the foldable returnable box 11 is provided with the bottom reinforcing plate 18 inside the bottom flap 17 in order to reinforce the strength of the bottom flap 17, in the conventional case, it is reinforced by the flap and the adhesive tape or the staple. The desired bottom flap 17 can be sufficiently reinforced by the bottom reinforcing plate 18, and therefore has extremely high durability, at the same time has excellent sealing performance, and has strength enough to withstand repeated use. Since it is small, the number of manufacturing steps is also small and it can be provided at low cost.

The four bottom flaps 172 to 175 are also provided.
Among them, the bottom surface flap 174 connected to the front surface plate 14 and the bottom surface flap 172 connected to one side surface plate 12 are partially bonded, and the bottom surface flap 175 connected to the rear surface plate 15 and the other side surface plate 13 The bottom flap 173 connected to the part is partially adhered, and the bottom opening is closed by combining the bottom flap 173 with the box raising and closing the bottom opening. Therefore, when raising the returnable box in the folded state to the box raising state. The four bottom flaps 172 to 175 are automatically combined with each other in the form of a swastika when the box is raised to close the bottom opening.
Therefore, no special manual work is required to close the bottom opening, and unlike the type where four bottom flaps are gathered together to cover the bottom as close as possible, a part of them overlaps to cover the bottom, so the structural strength of the bottom is improved. You can secure enough.

Furthermore, the front plate 14 and the side plates 12,
13 has a height that exceeds the height of the box at the time of packaging,
A part from the upper edge to the height of the box at the time of packing is folded inward when the upper surface plate 16 closes the upper surface opening, and receives the peripheral edge of the upper surface plate 16, folding flaps 14a, 12a,
Since 13a is configured, when the articles are stored in the returnable box 11 which is raised from the folded state to the box-raised state, and the upper plate 16 closes the opening, the rear plate 15 to which the upper plate 16 is connected is attached. Except front plate 14 and left and right side plates 12, 1
By folding inward the folding flaps 14a, 12a, 13a provided as folding allowance portions at the respective upper end portions of the upper surface 3, the peripheral edge of the upper surface plate 16 can be supported in a frame shape, whereby the upper surface plate 16 can be supported by the front plate. Sufficient sealing strength can be obtained even by only partially locking it to 14, and small objects can be stacked on top plate 16 for conveyance, and the top opening can be sealed without using adhesive tape or staples. Since it can be stopped, the durability is not impaired even if it is used repeatedly, and it can be used repeatedly over a long period of time.

Further, the front plate 14 and the back plate 15 are slightly curved in the folded state, and due to the shortening of the width dimension (dW) associated with the bending, the inner width dimension Ws in the box-raised state and the outer width dimension in the folded state. Wf is almost the same. That is, as can be seen from the shape of the opening surface shown in FIG. 4, the folded returnable box 11 has several folded plate thicknesses at the central portion and the peripheral portion, so that the back plate 15 and the front plate 14 or the upper plate are not formed. The face plate 16 is slightly curved in a horizontal X shape,
The tension that causes this bending keeps the substantial planar projected area slightly smaller than the box-raised state. Therefore, it is possible to carry several sets of folding boxes that are in the same folding case in the folded state and carry them, which maximizes the convenience of carrying an empty traveling box. . In addition, the box folded in this way has a back plate 1
5 and the front plate 14 or the upper plate 16 are forcibly folded in a state of being bent under tension, and in particular, the two side plates 12 and 13 are subjected to a restoring force for opening in a V shape. As a result, when stored in a box in a box-raised state, this restoring force acts to press the inner wall of the storage box from the inside, and the storage box easily pops out of the storage box. There is no such thing, and the ability to maintain the stored state is excellent.

[0023]

As described above, according to the present invention,
A pair of left and right side plates that can be folded inward along the central longitudinal line, a front plate and a back plate connected through the pair of side plates, and an opening and closing at the upper edge and the lower edge of the back plate, respectively. An upper surface plate and a bottom surface flap that are freely connected are provided, and an upper surface plate that is openably and closably connected to the upper edge portion of the rear surface plate extends the pair of side surface plates in a flat plate shape so that the front surface plate and the rear surface plate face each other. In the folded state in which the front plate and the rear plate are aligned with each other by sandwiching the side plate while covering the upper surface opening and folding the pair of side plates inward along the central longitudinal line in the folded state. Four bottom flaps that are folded over the face plate and openably and closably connected to the lower edges of the front plate, the side plate, and the back plate cover the bottom opening in the box-raised state, and In the folded state Since the front plate, the side plate, and the back plate are folded on top of each other, when the articles are not stored, the left and right side plates are folded inward, and the back plate is directly inserted through the left and right side plates. By stacking the face plates and folding the top plate and the bottom flap, which are connected to the upper and lower sides of the rear plate, on the front plate, the wall thickness of 4 to 5 sheets can be suppressed to such an extent that they overlap vertically. Since the flat area does not exceed the size of the front plate and the back plate, it is very convenient to carry.Therefore, while maximizing the volume in the raised state of the box assembled in a three-dimensional shape, it can be folded flat. , Can be folded into a flat plate in the most compact form,
In addition, since the foldable returnable container is easy to assemble and disassemble and is lightweight, it has an excellent effect such that it can provide a returnable container suitable for periodical product transportation assuming repeated use. .

Further, according to the present invention, a bottom surface reinforcing plate is provided inside the bottom surface flap means so as to be openable and closable along the lower edge portion of the back plate, and when the box is raised, the bottom surface reinforcing means overlaps the inside of the bottom surface flap means to reinforce the bottom surface flap means. However, in the folded state, since the side plates are folded after being stacked on the back plate, the bottom reinforcing plate can reinforce the strength of the bottom flap means when the box is raised, so the durability is extremely high, At the same time, it has an excellent sealing property, has a strength enough to withstand repeated use, and has a small number of bonding points during manufacturing, and thus has the effects of being manufactured at a low manufacturing cost and being provided at low cost.

Further, according to the present invention, among the bottom flap means, the bottom flap connected to the front plate and the bottom flap connected to one side plate are partially adhered, and the bottom flap connected to the back plate. And the bottom flap connected to the other side plate are partly adhered to each other, and the bottom opening is closed by combining the bottom flap with the box raising,
When raising the returnable box in the folded state to the raised state, the four bottom flaps are automatically combined with each other in the shape of a claw to close the bottom opening when raising the box. No manual work is required, and unlike the type where the bottom flaps are gathered together to cover the bottom as close as possible, the bottoms are partially overlapped to cover the bottom, so that the structural strength of the bottom can be sufficiently secured. Play.

Further, according to the present invention, the front plate and the side plate have a height exceeding the height of the box at the time of packing,
Since the part from the upper edge to the height of the box at the time of packing is folded inward when closing the upper surface opening with the upper surface plate to form a folding flap that receives the peripheral edge of the upper surface plate, from the folded state When articles are stored in a returnable box that has been raised in a box-raised state, and when closing the top opening, the front plate and the left and right side plates except for the back plate connected to the top plate are provided with folding allowances at the upper ends. By folding the folding flap inward, the peripheral edge of the top plate can be supported in a frame shape, which allows sufficient sealing strength to be obtained by only partially locking the top plate to the front plate. ,
Small items can be stacked on the top plate for transport, and the top opening can be sealed without using adhesive tape or staples, so durability is not impaired even after repeated use, and it can be used for a long period of time. It has the effect that it can be repeatedly used.

In addition, the front plate and the back plate are slightly curved in the folded state, and due to the shortening of the width dimension due to the bending, the inner width dimension in the box-raised state and the outer width dimension in the folded state are substantially the same. In the folded returnable box, the thickness of several folded plates differs between the central part and the peripheral part, and the back plate and the front plate or the top plate are slightly curved in a horizontal X shape. By holding the tension that is applied so that the projected area of the plane is slightly smaller than that in the box-raised state, it is possible to carry several folded sets in the box-raised state even if they are the same returnable boxes. As a result, it is possible to maximize the convenience of carrying an empty carrying box, and it is easy to return and store it. Moreover, in the folded box, the back plate and the front plate or the top plate bend with tension. To the state Since the restoring force that tries to open in a V shape acts on the side plate that is folded with little effort and especially folded in half, this restoring force will cause the stored box to be stored when stored in the box in the raised state. By pressing the inner wall of the storage box from the inside, the box to be stored does not easily pop out of the storage box, and there is an effect such that the stored state is excellently maintained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a folding returnable box of the present invention.

FIG. 2 is an exploded view showing the foldable carrying box shown in FIG. 1 by disassembling it into three blocks.

FIG. 3 is a perspective view showing the foldable carrying box shown in FIG. 1 in a folded state.

FIG. 4 is a perspective view showing a state where the folding returnable box shown in FIG. 3 is being raised.

5 is a perspective view showing a state in which the foldable returnable box shown in FIG. 4 is raised.

6 is a perspective view showing a state immediately before the top plate is closed when the folding type returnable box shown in FIG. 5 is raised.

FIG. 7 is a perspective view showing an example of a conventional cardboard box.

8 is a side view showing a state where the cardboard box shown in FIG. 7 is crushed.

[Explanation of symbols]

 11 Foldable Carrying Box 12, 13 Side Plate 14 Front Plate 15 Back Plate 12a, 13a, 14a, 15a Folding Flap 16 Top Plate 172, 173, 174, 175 Bottom Flap 18 Bottom Reinforcing Plate Lc Central Longitudinal Line L, Li Folding Line B1 1st block B2 2nd block B3 3rd block

Claims (5)

[Claims] 1. A pair of left and right side plates that can be folded inward along a central longitudinal line, a front plate and a back plate connected through the pair of side plates, and an opening / closing mechanism at the upper edge of the back plate. In a box-raised state in which the pair of side plates are extended in a flat plate shape so that the front plate and the rear plate are spaced apart and opposed to each other, the upper surface opening is covered and the pair of side plates are cut along the central vertical cutting line. In the folded state in which the front plate and the back plate are aligned by sandwiching the side plates, the upper plate is folded over the front plate, and the bottom plate of the front plate, the side plate, and the back plate. A bottom flap means that is openably and closably connected to the edge portion, covers the bottom opening in the box-raised state, and folds over the front plate, the side plate, and the back plate in the folded state, respectively. And when Refoldable carrying box. 2. The bottom plate is provided so as to be openable and closable along the lower edge of the back plate and overlaps the inside of the bottom plate when the box is raised to reinforce the bottom flap means, and in the folded state, the spine. The foldable carrying box according to claim 1, further comprising a bottom reinforcing plate into which the side plate is folded after being stacked on the face plate. 3. The bottom flap means includes a bottom flap connected to a front plate and a bottom flap connected to one side plate, and a bottom flap connected to a back plate and the other side of the bottom flap. The foldable carrying box according to claim 1, wherein a bottom flap connected to the face plate is partially adhered, and the bottom opening is closed by raising the box and forming a pair of folds. 4. The front plate and the side plate have a height that exceeds the height of the box at the time of packing, and the portion from the upper edge to the height of the box at the time of packing is the upper surface of the top plate. 2. The foldable carrying box according to claim 1, wherein a folding flap that is folded inward when closing the opening and that receives a peripheral edge of the top plate is formed. 5. The front plate and the back plate are slightly curved in the folded state, and due to the shortening of the width dimension associated with the bending, the inner width dimension in the box-raised state and the outer width dimension in the folded state are almost the same. The foldable carrying box according to claim 1, wherein the foldable carrying boxes are identical.