JPH06127545A - Foldable box - Google Patents

Abstract

PURPOSE:To maintain sufficient strength when a box made of a corrugated fiberboard or the like is assembled and reduce an area when it is folded by making a pair of opposite side walls foldable in a lengthwise direction. CONSTITUTION:A first side wall 1 which is foldable inward at a center hinge 2 and a second side wall 3 showing a U-shaped cross section are integrally coupled at the hinge, and a bottom plate 5 is coupled to them. The bottom plate 5 comprises a trapezoidal part 7 and two triangular parts 8 with a fold 6 as a border, and the triangular part 8 can be folded inward at a junction 9 between the bottom plate 5 and the first side wall 1. Therefore the center of the first side wall 1 is folded inward at the hinge 2 while at the same time the triangular part 8 and the trapezoidal part 7 of the bottom plate 5 are folded inward, and these parts are folded into a space between the first side wall 1 and the second side wall 3 showing a U-shaped cross section. That is, two right and left parts are integrated by joining joint pieces 14 to each other to form a box.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable box without a lid and to a box made of cardboard or other thick paper or a thin synthetic resin plate.

[0002]

2. Description of the Related Art Most conventional corrugated cardboard boxes that can be folded are formed by bending and combining parts whose bottoms extend from four side walls. When folding, they are extended and the space between the side walls is increased. It has a structure that can be folded and folded.

[0003]

The foldable cardboard box as described above has a bottom formed of a combination of four small pieces extending from the side wall, and therefore, when a heavy and weak bottom is accommodated in the bottom, Is often omitted.

Furthermore, the force applied to the box in an oblique direction is weak, and the four side walls are laterally offset from each other, and the entire box is often twisted.

Further, since it folds between the side walls, it becomes laterally long even when folded, and the occupied area does not become so small.

It is an object of the present invention to provide a foldable box which is made of cardboard or other cardboard or a thin synthetic resin plate and has sufficient strength when assembled and has a small area when folded. .

[0007]

A foldable box according to the present invention comprises a first side wall which can be bent inward in a straight line extending in a longitudinal direction by a hinge at a central portion, and inward bending at both ends. Two second side walls each having a U-shaped cross section are alternately connected to each other, and further, one trapezoidal part connected to each other by a bending line and two triangular parts on both sides thereof are formed. The two bottom plates are integrally formed by connecting the trapezoidal portion at the lower end of the second side wall and the triangular portion at the lower end of the first side wall so as to be bendable. It is characterized in that it is configured so as to coincide with the position of the hinge at the center of the first side wall.

Further, the foldable box of the present invention has the above-mentioned structure, and by connecting the triangular portion of each bottom plate and the lower end of the first side wall by bellows, the side wall forming the box and The box can be folded even if the bottom plate is made of a relatively thick material.

Further, the foldable box of the present invention is the first
By providing a reinforcing plate near one lower end of one of the side walls of the same so as to be bendable, the reinforcing plate having the same shape and substantially the same area as the entire bottom plate (a part where the two bottom plates are joined) is reinforced and the bottom plate in the assembled state without any trouble in folding and This makes it possible to prevent the entire box from collapsing.

[0010]

EXAMPLE Next, an example of the foldable box of the present invention will be described. FIG. 1 is a diagram showing a state in which a box according to an embodiment of the present invention is assembled, FIG. 2 is a diagram showing a state in which the box is being folded, and FIG. 3 is a diagram showing a state in which the box is folded. The box of this embodiment has a central hinge 2 as shown in these figures.
The first side wall 1 which can be bent inward by means of and the second side wall 3 having a U-shaped cross section are integrally connected by a hinge 4 as shown in FIG. It is a combination of the bottom of the structure described in.

FIG. 4 is an exploded view of the box of this embodiment, in which the interior and the bottom plate are shown so as to appear.

The bottom plate 5 comprises a trapezoidal portion 7 and two triangular portions 8 with a fold line 6 as a boundary, and the triangular portion is formed at a joint portion 9 between the bottom plate and the foldable first side wall 1. It has a structure in which 8 is folded inward. Therefore, at the same time when the center of the first side wall 1 is folded inward by the hinge 2, the triangular portion 8 and the trapezoidal portion 7 of the bottom plate 5 are folded inward, and these portions have the cross section shown in FIG. It is located in the second side wall 2 having the shape of a letter and is folded into the shape shown.

That is, the left and right two parts shown in FIG. 4 are integrated by joining the parts of the joining piece 11 to each other to form a box as shown in FIG. If the hinge 3 of the side wall 2 that can be folded is folded inward at the same time as the bottom plate 5 is folded inward at the fold line 6 of the bottom plate 5 as described above, the state shown in FIG. Folded into.

Here, the box of this embodiment uses cardboard, thin synthetic resin or the like as a material as described above,
It has a constant thickness. Moreover, the foldable side wall 2
It is actually difficult to fold the bottom plate 5 upward while folding the side wall 2 inward while the bottom plate 5 and the bottom plate 5 are continuous. Therefore, in this embodiment, by dividing the bottom plate 5 into two parts that are separated into left and right parts, the bottom plate 5 is folded inward and the second side wall 3 is formed.
When it comes close to, it becomes possible to fold it by pulling it away from each other and making it impossible to fold.

In the portion indicated by reference symbol A in FIG. 4, the boundary between the first side wall 1 and the bottom plate 5 which can be bent when the bottom plate 5 is bent inward from the fold line 6, that is, when the fold line 6 is bent upward, It is necessary to bend the boundary between the second side wall 3 and the bottom plate 5 at the same time. In order to be able to bend at the same time, the first side wall side and the second side wall side need to be symmetrical with respect to the fold line 6 and have to be equidistant. If it meets this requirement, it can be bent,
As mentioned above, when the material forming the plate such as the side wall is thin,
If there is no problem, but if the thickness is increased, it may be difficult to fold even if the above requirements are satisfied. Therefore, in this embodiment, assuming that the material of the plate is relatively thick, the joint portion between the first side wall 1 and the triangular portion 8 of the bottom plate 5 is formed into a bellows fold 10 with a certain margin, Bending is possible even if the thickness is large. 5, FIG. 6 and FIG. 7 are for explaining the bending means when the material near the fold line 6 is thick. In FIG.
Reference numeral 1 denotes a first side wall, 3 denotes a second side wall, and 6 denotes a fold line in this embodiment. The chain line indicates the position of the corner when the first side wall 1, the second side wall 3 and the bottom plate 5 are simply foldably joined.

In this figure, when the first side wall 1, the second side wall 3 and the bottom plate 5 are relatively thick, portions of this thickness cannot interfere with each other in the chain line state and cannot be bent. . In order to avoid this, as shown in FIG. 5, the corners of the side wall 1 may be folded so that the thickness of the bottom plate 5 can be accommodated. However, when the corners are folded in this way,
With the box assembled, the folded corners press the contents, which is not preferable.

In FIG. 6, the side portion of the square notch portion in FIG. 5 is removed, and the bottom plate surrounded by this side wall and a line extending in parallel with it is also cut, and this is free to bend. It is replaced with a highly flexible material 10 (for example, thin paper or film-like synthetic resin).
Also in this case, it can be bent similarly to the structure shown in FIG. 5, and the flexible portion 10 further facilitates bending.

Further, in FIG. 7, the flexible material portion 10 in FIG. 6 is appropriately folded, for example, as shown in FIG. 7B, and then the side wall and the wall of the square cutout portion are hinged. It is one that is joined together. That is, the structure shown in FIG. 7 is the structure of the part indicated by reference numeral A in the embodiment shown in FIG. 4, and the flexible part 10 is a bellows fold.

As described above, in the embodiment shown in FIGS. 1 to 4, even if a thick plate-like material is used as the material for the side wall, the bottom plate, etc., it can be folded by the above-mentioned method.

The bending state of the bottom plate in the course of folding the box in this embodiment is as shown in FIGS. 8 to 10. Of these drawings, FIG. 8 is a view of the box as seen from the bottom plate side, and when the first side wall 1 is bent, the bottom plate 5 has a trapezoidal portion 7.
And the triangular part 8 folds and bends toward the inside of the box. This is seen from the inside as shown in FIGS. Figure 10
9 is a view of FIG. 9 seen from the direction B, and FIG. 12 is CC of FIG.
FIG.

In this way, the trapezoidal portion 7 has the second side wall 3
Is bent on the side of, and the triangular portion 8 and the first side wall 1 are bent so as to overlap each other, and all are overlapped so as to be in contact with each other as shown in FIG. That is, the bottom plate 5 fits between the U-shaped first side wall 1 and the folded second side wall 3.

FIG. 13 is a perspective view of a box of another embodiment. In this embodiment, when the box of the present invention is made up of two parts having the same shape of the bottom plate so that it can be folded even if it is formed of a thick material, the embodiment in which the boundary part is reinforced is used. is there. That is, another reinforcing bottom plate 16 having the same area as the inner surface portion of the bottom plate 5 is provided on one side of the U-shaped second side wall 3 at the boundary between the second side wall 3 and the bottom plate 5. It is rotatably attached.

In this embodiment, the bottom plate 16 is reinforced by inclining the reinforcing bottom plate 16 after assembling the box.
At the same time, each side wall is pushed outward by the peripheral portion of the reinforcing bottom plate 16, which also increases the strength of the box itself.

FIG. 14 shows an example in which a reinforcing bottom plate is attached to a shallow box. As shown in the figure, two reinforcing bottom plates 1 having different widths (lengths from the mounting position to the tip) on the left and right sides.
With 7 and 18 attached, the height of the box is low (shallow)
Therefore, even if the bottom plate that covers the entire inner surface of the bottom plate 5 cannot be attached, the attachment is possible according to this embodiment. In this embodiment, when the two reinforcing bottom plates are laid down, the tips of both reinforcing bottom plates 17 and 18 are in contact with each other and their boundary lines do not coincide with the boundary lines of the bottom plate 5, so the bottom plate 5
Will be reinforced.

Further, the depth of the box is 1 of the length of the second side wall of the box.
When it is close to / 2, it is not preferable to use two reinforcing bottom plates having different lengths because the longer reinforcing bottom plate comes out from the side wall when the box is folded. In this case, two reinforcing bottom plates having the same length may be used, which has an effect of preventing the bottom plate 5 from being broken at the fold line 6.

FIG. 15 shows a box with a lid, which has the same structure as the above-mentioned box of the present invention except for the lid 11. This lid has a structure that opens from the center.

FIG. 16 shows another box with a lid, in which the lid 12 is opened from one side.

As described above, with the structure having the lid, it is possible to increase the strength when assembled and to stack the boxes.

The box shown in FIG. 17 is provided with plate 13 for stacking boxes on both sides, and FIG. 18 is a view showing the time of stacking. This allows the boxes to be fixed and stacked in the same manner as the lids of FIGS. 15 and 16. In the box of this embodiment, the contents can be visually observed or the products can be put in and taken out without changing the stacking plate.

Reference numeral 14 in the above embodiment is for preventing the bottom plate 5 from bending at the central connecting portion when the box is assembled. Further, in FIG. 19, the first side wall 1 has a hinge 2
A member 15 is provided to prevent bending of the first side wall 1 and is used by being attached to the upper end of the first side wall 1.

As the material of the box of the present invention described above,
In addition to the corrugated board described above, thick paper, thin synthetic resin, or the like may be used.

The folding points such as hinges and folds in the box of the present invention may be joined with a flexible film like the joints in FIG. 4 or by so-called hinges. Further, the box is preferably formed integrally as much as possible, but the divided pieces may be joined as described above in terms of manufacturing.

[0033]

Since the box of the present invention is vertically folded at the center of the side wall, the shape after folding can be made smaller than the conventional one. Also, the structure is foldable even if it is formed of corrugated cardboard or a thin synthetic resin plate.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembled state of a box according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state in the middle of folding of the embodiment.

FIG. 3 is a diagram of the same embodiment in a folded state.

FIG. 4 is an exploded perspective view of the same embodiment.

FIG. 5 is a first diagram for sequentially explaining a foldable principle of the embodiment.

FIG. 6 is a foldable second principle diagram of the embodiment.

FIG. 7 is a third principle diagram of the embodiment in which folding is possible.

FIG. 8 is a diagram showing a bent state of the bottom plate of the embodiment from below.

FIG. 9 is a top view of the bent state of the bottom plate of the embodiment.

FIG. 10 is a view seen from the direction of arrow B in FIG.

11 is a sectional view taken along line CC of FIG.

FIG. 12 is a view showing a state in which the bottom plate of the embodiment is folded.

FIG. 13 is a perspective view showing an embodiment in which a reinforcing bottom plate is provided.

FIG. 14 is a view showing another embodiment in which a reinforcing bottom plate is provided.

FIG. 15 is a perspective view of an embodiment provided with a lid.

FIG. 16 is a view showing another embodiment in which a lid is provided.

FIG. 17 is a diagram showing an example in which a stacking plate is provided.

FIG. 18 is a diagram showing a state in which the boxes of the embodiment shown in FIG. 17 are stacked.

FIG. 19 is a diagram showing an example in which a bending preventing member for the first side wall is provided.

[Explanation of symbols]

 1 1st side wall 2 Hinge 3 2nd side wall 5 Bottom plate 6 Fold 7 Trapezoidal part 8 Triangular part 10 Bellows folding

Claims (4)

[Claims] 1. A first side wall which can be bent inward in a straight line extending in a vertical direction by a hinge at a central portion, and a second side wall which is bent inward at both ends and has a U-shaped cross section. The two side plates of the trapezoidal portion of the second side wall are formed by alternately connecting two side walls of The lower end portion and the triangular portion are foldably connected and integrated at the lower end portion of the first side wall, and the boundary portion of both bottom plates coincides with the position of the hinge in the central portion of the first side wall. A foldable box characterized by being configured to do. 2. The collapsible box according to claim 1, wherein the triangular portion of the bottom plate and the lower end portion of the first side wall are connected via a bellows. 3. The foldable box according to claim 1, wherein an auxiliary plate having the same shape as the bottom plate and having substantially the same area as that of the bottom plate is foldably connected to one inner lower end portion of the second side wall. 4. A rectangular auxiliary plate of a different size is connected to the inner lower ends of the second side walls so as to be foldable at one side thereof, and a box is assembled to place the auxiliary plate on the bottom plate. The collapsible box according to claim 1 or 2, wherein the sides on the opposite side to the connection side are in contact with each other when the box is folded down.