TW201412615A - Folding container - Google Patents

Abstract

The present invention provides a folding box which can prevent the side walls from deforming or breaking due to a load from above, and which has excellent thermal insulation properties. A folding box (A), according to the present invention, is provided with folding second side walls (40), each of the second side walls (40) comprising: an upper panel portion (40A) and a lower panel portion (40B) which are parallel in the vertical direction; a folding portion which joins the upper panel portion (40A) and the lower panel portion (40B); and a spacer (50) which can fill a space (S) that is formed between the upper panel portion (40A) and the lower panel portion (40B) when the walls are in an upright position.

Description

Folding box

The present invention relates to a collapsible box for storing, storing or transporting various items.

Since the volume can be reduced in a state where there is no storage, and the transportation cost and the storage cost at the time of non-use can be reduced, the foldable box is widely used, and several examples are described in Patent Documents 1, 2 and the like. The foldable box described in Patent Document 1 is a foldable box made of synthetic resin, and the upper side of the pair of first side walls of the height restriction is pivotally connected to the opposite sides of the top frame; and The upper side of the pair of second side walls that are freely foldable in a pivotal connection manner is pivotally connected to the other two sides of the top frame; and the lower side of the second side wall is formed to be pivotally connected to the bottom frame respectively The two sides of the direction.

In the foldable box, like the second side wall, the middle portion thereof is pivotally connected, whereby the freely folded side wall can be used, but due to the complicated structure of the intermediate pivoting portion, it is easy to generate the intermediate pivoting portion due to the repeated use of the position. damaged. Further, when it is used as a cold storage container, cold air cannot be prevented from leaking from the gap formed in the intermediate pivot portion of the second side wall, and care must be taken in temperature management.

The collapsible container described in Patent Document 2 corresponds to the member of the second side wall, and is an upper wall portion and a lower wall portion which are arranged in the vertical direction, and a bent portion which is connected to the upper wall portion and the lower wall portion. Composition. Next, the thickness of the bent portion is thinner than the thickness of the upper wall portion and the lower wall portion. The second side wall of this aspect can be integrally formed, and durability can be improved due to the selection of materials. In addition, in the bent portion, a gap used as a ventilation path is not formed, The thermal insulation performance is also improved compared to the side wall having a pivotal connection in the middle. Further, the upper wall portion and the lower wall portion have a hollow portion, and this configuration also enhances the heat insulating property.

[First technical literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 9-188333

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2008-155983

The second side wall in the foldable box of the aspect described in Patent Document 1 is replaced with the second side wall of the aspect described in Patent Document 2, that is, the upper wall portion and the lower wall are juxtaposed in the vertical direction. A side wall formed by a portion and a bent portion connected to the upper wall portion and the lower wall portion can provide a foldable box with improved durability and improved heat insulation.

However, since the thickness of the bent portion is thinner than the thickness of the upper wall portion and the lower wall portion, the heat insulating performance is lower than that of the upper wall portion and the lower wall portion. Further, when the second side wall is raised and the foldable box is in the use state, when the load exceeding the design value acts from above, the bent portion becomes structurally weak, and the second side wall may be deformed.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a more improved foldable box which is provided on a part of a side wall, and has an upper wall portion and a lower wall portion, and is connected to the upper wall portion and the lower wall portion The bent portion of the side wall in a state in which the thickness of the bent portion is thinner than the thickness of the upper wall portion and the lower wall portion is not easily deformed by the load from above, and It also ensures high thermal insulation.

The foldable box of the present invention comprises: a top frame; a bottom frame; a pair of first side walls, wherein the upper or lower side is pivotally connected to either one of the top frame or the bottom frame; and a pair of second side walls, the upper side thereof pivot The bottom frame is pivotally connected to the bottom frame, and the bottom frame is pivotally connected to the bottom frame, and is freely bendable and erected; the second side wall has at least an upper wall portion and a lower wall portion juxtaposed in the up and down direction, and the upper wall a bent portion connecting the portion and the lower wall portion, the thickness of the bent portion being thinner than a thickness of the upper wall portion and the lower wall portion; the second side wall further having a spacer for filling up when erecting The thickness of the bent portion is thinner than the thickness of the upper wall portion and the lower wall portion, and is formed in a space on the side of the bent portion.

In the foldable box of the present invention, the second side wall is provided with a spacer to fill the space formed on the side of the bent portion, and when the load from the upper side acts on the second side wall, the load can be received by the spacer. Thereby, the bent portion can be prevented from being inadvertently deformed, and the deformation of the second side wall can be prevented. In addition, because of the presence of the spacer, the bent portion can be reduced in contact with the outside air, and the heat insulating performance can be improved. Thereby, a foldable box with improved durability and high heat resistance can be obtained.

In the foldable box of the present invention, the spacer may be provided in the entire width direction of the bent portion, or the spacer may be provided in a part of the width direction. As long as the strength and thermal insulation properties required for the foldable box are considered, it is appropriate to select.

In the foldable box of the present invention, the spacer member may be freely detachable with respect to the upper wall portion or the lower wall portion, or may be integrally formed on either side. In the case where the spacer is freely attached and detached, it is preferable to blow the shape from the viewpoint of improving the heat insulation of the upper wall portion, the lower wall portion, and the bent portion of the second side wall, and the weight reduction. The integrally formed article preferably forms a hollow portion in the upper wall portion and the lower wall portion. Further, the spacer is preferably an injection molded article.

Although it is not limited, in the foldable box of the present invention, the top frame and the bottom frame are preferably molded articles produced by injection molding from the viewpoint of ensuring the required strength. From the viewpoint of improving heat insulation and weight reduction, the first side wall is preferably a blow molded product having a hollow portion. Further, the pivoting portions of the first side wall and the second side wall are preferably integrally formed with the side wall by insert molding from the viewpoint of securing strength.

The collapsible box of the present invention can be made of any material under the condition of having the required strength. From the viewpoint of ease of handling and light weight, it is preferably made of a synthetic resin material. As a synthetic resin material, a polyolefin resin etc. are mentioned as an example. It may be made of a non-foamed resin, a foamed resin, or a combination of a non-foamed resin and a foamed resin. It can also be a combination of a metal material and a synthetic resin material. In this case, the metal material is mainly used for the pivot portion.

According to the present invention, it is possible to obtain a more improved foldable box which does not easily deform the load from above and which ensures high heat insulation performance.

10‧‧‧ top frame

11‧‧‧Short side frame

12‧‧‧Long side wall

13‧‧‧Open noodles

14‧‧‧1st pivoting tab

15‧‧‧2nd pivoting tab

20‧‧‧ bottom frame

21‧‧‧ Short side frame

22‧‧‧Long side frame

23‧‧‧floor

24‧‧‧ convex

25‧‧‧Protruding

26‧‧‧ recess

30‧‧‧1st side wall

31‧‧‧Side wall body

32‧‧‧ pivoting tab

33‧‧‧ recessed

34‧‧‧ Hollow

40‧‧‧ second side wall

40A‧‧‧Upper wall section

40B‧‧‧ Lower wall section

40C‧‧‧Bending section

41‧‧‧ Hollow

42‧‧‧ pivoting tab

43‧‧‧ pivoting tab

45‧‧‧ recessed

45A‧‧‧ recessed part

46‧‧‧Pushing into the board

47‧‧‧ Protrusion

50A‧‧‧(Segmentation) spacer

50‧‧‧ spacers

51‧‧‧ body part

52‧‧‧Cards

52A‧‧‧Clock

53‧‧‧ top board

54‧‧‧front board

55‧‧‧floor

56‧‧‧ openings

57‧‧‧卡止棒

58‧‧‧Incision

59‧‧‧ pushed face

60‧‧‧ mounting holes

70‧‧‧Installation tools

71‧‧‧ side panels

72‧‧‧ card stop

73‧‧‧ card stop

74‧‧‧ditch

75‧‧‧through holes

81‧‧‧ top board

82‧‧‧ front board

83‧‧‧floor

P‧‧ sales

A‧‧‧Folding box

S‧‧‧ The space formed between the upper wall portion and the lower wall portion because the thickness of the bent portion is thinner than the thickness of the upper wall portion and the lower wall portion

Fig. 1 is a perspective view showing a state in which each side wall of one embodiment of the foldable box of the present invention is erected.

Fig. 2 is a cross-sectional view taken along line II-II of Fig. 1.

Fig. 3 is a cross-sectional view taken along line III-III of Fig. 1.

Fig. 4 (a) is a view showing the foldable box shown in Fig. 1 in the middle of folding, and (b) showing a folded view.

Fig. 5 (a) is a front view showing a state in which the second side wall of the foldable box shown in Fig. 1 is erected, and (b) is a side view.

Fig. 6 is a cross-sectional view showing a bent portion and a spacer of the second side wall shown in Fig. 5, wherein (a) shows a state in which the spacer is attached, and (b) shows a state in which the spacer is attached.

Fig. 7 is a perspective view showing a tool for mounting a spacer.

Fig. 8 is a perspective view showing the spacer body.

Fig. 9 is a perspective view showing the first side wall of the foldable box shown in Fig. 1.

Fig. 10 (a) is a front view showing a state in which the second side wall of the other aspect is erected, and (b) is a side view thereof.

Fig. 11 is a cross-sectional view showing a bent portion and a spacer of the second side wall shown in Fig. 10, wherein (a) shows a state in which the spacer is mounted, and (b) shows a state after the spacer is attached.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The foldable box A of the drawing has a rectangular shape in plan view, and is composed of a rectangular top frame 10 and a bottom frame 20, a pair of first side walls 30 and 30, and a pair of second side walls 40 and 40.

The top frame 10 is composed of the opposite short side frames 11 and 11 and the opposite long side frames 12 and 12, and the top surface side forms an open surface 13. A position near the upper end of the inner side of each of the short side frames 11 is integrally formed so as to form an appropriate number of sets (two sets in the drawing) of the first pivoting fins 14 and a position near the lower end of the inner side of the long side frame 12, Further, the second pivoting projections 15 of the appropriate number of groups (three groups in the drawing) are formed integrally. In a preferred embodiment, a resin such as a polyolefin resin is used, and the top frame 10 is integrally formed by an injection molding method.

The bottom frame 20 has the same size as the top frame 10, and also has the opposite short side frames 21, 21 and the opposite long side frames 22, 22, the bottom surface of which is closed by the bottom plate 23. In the example of the drawing, the convex portion 24 is integrally formed in a substantially central portion inside each of the short side frames 21. Further, the protruding portion 25 is formed on the inner side of the long side frame 22, and the second pivoting fin 15 formed on the inner side of the long side frame 12 of the top frame 10 is formed in the protruding portion 25. In the forward direction, a concave portion 26 for inserting the pivoting tab 43 formed at the lower end of the lower wall portion 40B of the second side wall 40 to be described later is formed. As shown in the figure, in this example, in the bottom plate 23, the stepped portion located below the lower end of the short side frame 21 and the long side frame 22 is filled with a suitable cushioning material. In a preferred embodiment, a resin such as a polyolefin resin is used, and the bottom plate 23 is integrally formed by an injection molding method.

As shown in FIG. 9, the first side wall 30 is composed of a side wall main body 31 and two sets of pivoting fins 32 integrally formed on the upper end surface thereof by insert molding. The width W1 of the side wall main body 31 is approximately equal to the inner side space between the long side frames 12 and 12 facing the top frame 10 (the inner side spacing between the long side frames 22 and 22 opposite to the bottom frame 20). . Within a range of 1/2 of the inner pitch between the short side frames 11 and 11 opposed to the top frame 10 (the inner pitch between the opposite short side frames 21 and 21 of the bottom frame 20) The height H1 can be appropriately set corresponding to the height required for the foldable box A. The thickness can be free.

The two sets of pivoting tabs 32 and 32 are formed at positions corresponding to the first pivoting tabs 14 and 14 formed on the inner side of the short side frame 11 of the top frame 10, and the pivoting tabs 32 are provided. , embedded (or externally embedded) between the first pivoting tabs 14 as shown. The lower end portion of the side wall main body 31 is formed with a concave portion 33 at a position opposed to the convex portion 24 formed on the inner side of the short side frame 21 of the bottom frame 20. The first side wall 30 may be formed of a foamed resin sheet of a resin such as a polystyrene resin or a polyolefin resin, or a resin such as a polyolefin resin, or a blow molding method as shown in the drawing ( Alternatively, it is inserted into the blow molding method to form a state in which the hollow portion 34 is formed inside. The pivoting tab 32 is preferably a non-foamed molded article of a resin such as a polyolefin resin.

The pivoting fins 32 and 32 formed on the upper end surface of the first side wall 30 are fitted into the first pivoting fins 14 and 14 formed on the inner side of the short side frame 11 of the top frame 10 (or The outer fitting is combined with the pin P, whereby the first side wall 30 is formed to be pivotally coupled to the side of the short side frame 11 of the top frame 10, as shown by the broken line in FIG. The transfer joint is a fulcrum and rotates within a range of 90 degrees. When the vertical state is formed, the lower end surface abuts against the bottom frame 20, and the convex portion 24 formed on the inner side of the short side frame 21 of the bottom frame 20 is fitted into the concave portion 33 formed at the lower end. Thereby, the first side wall 30 can stabilize the erected state while limiting the height of the foldable box A. At the time of folding, as shown in FIG. 4(b), the first side wall 30 is housed in the upper region of the side walls 11, 12 of the top frame 10 by being turned up to the horizontal state. Further, in a state in which the first side wall 30 is housed in the top frame 10 in a horizontal state, the second pivoting fin 15 formed on the inner side of the long side wall 12 of the top frame 10 is located below the first side wall 30. position.

Next, the second side wall 40 will be described. As shown in Fig. 5, the second side wall 40 is generally rectangular in side view, and is connected to the upper wall portion 40A and the lower wall portion 40B which are juxtaposed in the up and down direction, and to the upper wall portion 40A and the lower wall portion 40B. The bent portion 40C is formed. The upper wall portion 40A and the lower wall portion 40B are the same size and are also rectangular in side view. The upper wall portion 40A and the lower wall portion 40B may be a foamed resin sheet of a resin such as a polystyrene resin or a polyolefin resin, and in the drawings, a resin such as a polyolefin resin is used, and a blow molding method is used. The inside has a hollow portion 41 (see FIG. 6 and the like). When forming, the bent portion 40C is integrally formed on the partial portion The position of one side of the thickness direction of the upper wall portion 40A and the lower wall portion 40B. In order to facilitate the bending, the thickness of the bent portion 40C is thinner than the thickness of the upper wall portion 40A and the lower wall portion 40B.

The upper end surface of the upper wall portion 40A is integrally molded to form three sets of pivoting tabs 42 by insert molding, and the lower end surface of the lower wall portion 40B is also integrally formed to form three sets of pivoting projections by insert molding. Sheet 43. The pivoting tabs 42 and 43 are preferably non-foamed molded articles of a resin such as a polyolefin resin.

The width W2 of the second side wall 40 is substantially equal to the inner spacing between the short side frames 11 and 11 facing the top frame 10 (the inner spacing between the short side frames 21 and 21 facing the bottom plate 20) . As shown in FIG. 3, the height H2 of the second side wall 40 is such that when the first side wall 30 is erected, the pivoting tab 42 formed on the upper end surface of the upper wall portion 40A can be formed. At the position of the second pivoting tab 15 of the top frame 10, the pivoting tabs 43 formed on the lower end surface of the lower wall portion 40B can be embedded in the recessed portion 26 of the bottom frame 20. the height of. Next, the pivoting tab 42 is pivotally coupled to the second pivoting tab 15 by the insertion of the pin P, and the pin is inserted between the pivoting tab 43 and the side wall of the recessed portion 26 P is pivotally connected, and the second side wall 40 is formed to be pivotally connected to the top frame 10 and the lower end side to be pivotally connected to the bottom frame 20, corresponding to the distance between the top frame 10 and the bottom frame 20, The bent portion 40C forms a curved state that is bent inward.

In the second side wall 40 of the present invention, since the thickness of the bent portion 40C is thinner than the thickness of the upper wall portion 40A and the lower wall portion 40B, when erected, the side of the bent portion 40C is formed. The space S in the depth (see Figure 6). In order to fill the space S, the spacers 50 as shown in FIG. 8 and the like are provided on the second side wall 40. The thickness of the spacer 50 in the upper and lower directions is approximately equal to the height of the space S in the vertical direction when the second side wall 40 shown in FIG. 3 is in the upright state, and the width of the spacer 50 is approximately equal to the width of the space S. . Further, in the example of the drawings, the spacer 50 is composed of two divided spacers 50A and 50A having a width which is half the width of the space S. The entire width of the space S may be covered by a single spacer, or the entire width of the space S may be covered by two or more divided spacers 50A. In a preferred embodiment, the spacer 50 is a non-foamed molded article of a resin such as a polyolefin resin, and is formed by injection molding an integrally molded article.

Hereinafter, the spacer 50 will be described by taking the above-described divided spacer 50A as an example. In the example of the drawing, the divided spacer 50A is formed by a rod-shaped body portion 51 and a locking portion 52 projecting from two of the body portions 51. The height of the body portion 51 is approximately equal to the height of the space S, and the width is approximately equal to 1/2 of the width of the space S. The width of the body portion 51 in the front-rear direction is approximately equal to the depth of the space S, that is, the distance from the front face of the upper wall portion 40A (lower wall portion 40B) to the aforementioned bent portion 40C. Further, the front portion on the lower end side of the upper wall portion 40A is formed with four recessed portions 45 into which the locking portions 52 of the divided spacers 50A are inserted. The thickness of the locking portion 52 of the divided spacer 50A in the front-rear direction is approximately the same as the depth of the concave portion 45, and the height thereof is substantially equal to the height of the concave portion 45.

The locking portion 52 includes a top plate 53, a front plate 54, and a bottom plate 55, and an opening 56 is formed in the front plate 54. The bottom plate 55 is provided with a locking bar 57, and the upper end of the locking bar 57 reaches the vicinity of the upper edge of the opening 56. Further, a slit 58 is formed at the upper end portion of the locking bar 57. The upper end of the locking bar 57 forms a push-out surface 59 whose tip end is tapered, and the lower end of the push-out surface 59 has a diameter slightly larger than the body portion of the locking bar 57. Then, a portion of the enlarged diameter portion protrudes into the opening 56.

When the divided spacer 50A is brought into the space S in the second side wall 40 of the erected state, the mounting hole 60 is formed on the wall surface of the recessed portion 45 opposed to the opening 56 formed in the front plate 54. It has a stepped portion facing inward, and the mounting hole 60 is provided with an attachment tool 70 as shown in FIG. The mounting tool 70 is composed of a side plate 71, a locking body 72 on the side of the side plate 71, and a locking plate 73 on the other side of the side plate 71. A groove 74 is formed between the side plate 71 and the locking plate 73. The side plate 71 is fitted into the stepped portion, and a wall surface of the recessed portion 45 around the mounting hole 60 is fitted into the groove 74, thereby fixing the mounting tool 70 to the recessed portion. 45 wall.

The height of the locking body 72 is approximately equal to the distance from the base of the locking bar 57 to the lower end of the pushing surface 59. Further, the locking body 72 is formed to have approximately the same cross-sectional shape as the locking bar 57. Through hole 75. Next, the distance between the back surface of the top plate 53 and the front end of the locking bar 57 in the locking portion 52 is approximately equal to the height of the locking body 72 of the mounting tool 70.

The procedure for attaching the divided spacer 50A to the second side wall 40 will be described below. First, as shown in FIG. 6(a), the second side wall 40 is slightly bent, and the mounting hole 60 formed in the wall surface of the recessed portion 45 formed at the lower end of the upper wall portion 40A is mounted. Install tool 70. Then, the locking body 72 of the mounting tool 70 is inserted into the space between the top plate 53 of the locking portion 52 and the front end of the locking bar 57 in the divided spacer 50A, and the locking bar 57 and the through hole 75 are inserted after the insertion. The position is the same. Its state is shown in Figure 6(a). Next, the divided spacer 50A is pressed upward. Thereby, the push-out surface 59 whose front end of the locking bar 57 is tapered is guided and gradually inserted into the through hole 75, and finally, as shown in FIG. 6(b), the lower end step portion of the push-out surface 59 is formed to exceed the through hole. The state of the upper edge of 75 allows the divided spacer 50A to be firmly fixed to the lower end position of the upper wall portion 40A.

In a state where the division spacer 50A is fixed, the lower wall portion 40B can be freely bent to an angle of 180 degrees with respect to the upper wall portion 40A by the bent portion 40C, and, as shown in Fig. 6(b), on the upper wall When the portion 40A and the lower wall portion 40B are vertically erected, the gap between the upper wall portion 40A and the lower wall portion 40B, that is, because the thickness of the bent portion 40C is larger than that of the upper wall portion 40A and the lower wall portion 40B The space S formed on the side of the bent portion 40C having a thinner thickness is filled by the main body portion 51 of the divided spacer 50A in a state of substantially no upper and lower gaps.

Next, the aspect of the foldable case A of the present invention at the time of use and at the time of folding will be described. 2 and 3 show the state at the time of use. In this state, the pair of first side walls 30 and 30 are vertically erected with the pivotal connection portion on the short side frame 11 and the 11 side of the top frame 10 as a fulcrum, and the lower end thereof reaches the short side frame of the bottom frame 20. The bottom surface of 21, 21. Further, the pair of second side walls 40, 40 are pivotally connected to the pivotal connection portion on the side of the long side frame 12, 12 of the top frame 10, and the lower end side is pivotally connected to the long side frame of the bottom frame 20. The pivot joints on the 22, 22 sides are vertically erected in this manner. The aspect of the second side wall 40 in this state is shown in FIG. The user can store the appropriate items in the foldable box A in this aspect, and cover the top frame 10 with a cover not shown in the figure for the purpose of storing or transporting the items. .

After use, fold it to reduce the storage space. 4(a) shows the state in the middle of folding, firstly, the pair of first side walls 30, 30 are turned up with the pivotal connection portion of the top frame 10 as a fulcrum. To the horizontal state. Next, the operation is performed together with the turning up operation, and the intermediate portions of the pair of second side walls 40, 40 are pressed inward. This state is shown in Fig. 4(a). As the second side wall 40 is bent, the distance between the top frame 10 and the bottom frame 20 gradually approaches, and finally the state shown in FIG. 4(b) is formed. In this state, the upper wall portion 40A of the second side wall 40 and the lower wall portion 40B are in a folded state, and the first side walls 30, 30 are placed on the folded upper wall portion 40A to be folded. The volume of the box A is smaller than in the state of use.

The foldable box A of the present invention, when in the erected state as shown in Figs. 2 and 3, constitutes the upper wall portion 40A and the lower wall portion 40B of the second side wall 40, by which the bent portion 40C is Connect without air passage. Further, the space S between the lower end of the upper wall portion 40A and the upper end of the lower wall portion 40B formed by the bent portion 40C is substantially filled with the spacer 50 attached to the lower end of the upper wall portion 40A to fill the entire area. . Therefore, the heat insulating performance of the second side wall 40 can be improved more than the side wall in which the intermediate portion is pivotally connected. Further, when a large load is applied from above, since the spacer 50 can receive the load, the second side wall 40 can be prevented from being undesirably deformed.

10 and 11 show a second aspect of the second side wall 40. In this aspect, the configuration of the locking portion 52 in the spacer 50 is different from that described in FIG. Further, the shape of the concave portion 45 formed on the front end portion on the lower end side of the upper wall portion 40A is also different. Hereinafter, the description will be centered on the different points.

In the spacer 50A, the locking portion 52A is composed of a top plate 81, a front plate 82, and a bottom plate 83, and a portion of the front plate 82 that is close to the top plate 81 is recessed toward the inner side. Further, the bottom plate 83 is located slightly above the body portion 51 of the spacer 50A. On the other hand, the concave portion 45A formed on the front end portion on the lower end side of the upper wall portion 40A has an upper portion having a press-in plate 46 that supports the upper portion of the plate 82 before the locking portion 52A from the outside, as described above. The portion recessed inside; and the projection 47 enter the gap between the bottom plate 82 and the body portion 51A of the spacer 50A.

When the spacer 50A is attached, the locking portion 52A is inserted into the recessed portion 45A upward from the obliquely downward direction, and when the top plate 81 is connected to the top surface of the recessed portion 45A, the spacer 50A is oriented toward the second. The bent portion 40C of the side wall 40 is pressed. Thereby, as shown in FIG. 11(b), the body portion 51 of the spacer 50A enters the space S, and in addition, with the protrusion 47 entering the gap between the bottom plate 83 and the body portion 51 of the spacer, The spacer 50A is fixed to the lower end side of the upper wall portion 40A of the second side wall 40.

Further, in the above-described example, the spacer 50 (50A) is fitted to the lower end side of the upper wall portion 40A of the second side wall 40, but may be attached to the upper end side of the lower wall portion 40B. The entrance portion 45 (45A) is formed on the upper end side of the lower wall portion 40B. Further, in the above description, the spacer 50 has a length covering the entire width of the second side wall 40. However, in the case where the required strength or heat insulation can be ensured, the spacer 50 may cover only the second side wall 40. The shape of the width. Further, the spacer 50 may be integrally formed with the lower end side of the upper wall portion 40A or the upper end side of the lower wall portion 40B, or may be integrally formed with the both, as long as it can be formed by insert molding or the like.

10‧‧‧ top frame

11‧‧‧Short side frame

12‧‧‧Long side wall

20‧‧‧ bottom frame

22‧‧‧Long side frame

23‧‧‧floor

30‧‧‧1st side wall

40‧‧‧ second side wall

40A‧‧‧Upper wall section

40B‧‧‧ Lower wall section

40C‧‧‧Bending section

50‧‧‧ spacers

A‧‧‧Folding box

Claims (4)

a foldable box comprising a top frame, a bottom frame, a pair of first side walls and a pair of second side walls, wherein an upper side or a lower side of the pair of first side walls is pivotally connected to one of the top frame or the bottom frame; The upper side of the second side wall is pivotally connected to the top frame, and the lower side of the pair of second side walls is pivotally connected to the bottom frame, and can be freely folded and erected, wherein the second side wall has at least An upper wall portion, a lower wall portion, and a bent portion connected to the upper wall portion and the lower wall portion; the thickness of the bent portion is thinner than the thickness of the upper wall portion and the lower wall portion; The second side wall further includes a spacer for filling the side of the bent portion when the second side wall is erected because the thickness of the bent portion is thinner than the thickness of the upper wall portion and the lower wall portion Space. A collapsible box according to claim 1, wherein the spacer is provided over the entire length of the bent portion in the width direction or in a part of the width direction thereof. The collapsible box of claim 1, wherein the spacer is detachably attachable to the upper wall portion or the lower wall portion. The foldable box according to any one of claims 1 to 3, wherein the second side wall upper portion, the lower wall portion and the bent portion are blow molded articles, and the spacer is an injection molded article.