JPH08310523A - Synthetic resin freely foldable box - Google Patents

Abstract

PURPOSE: To make, when setting up a box, the bottom of the box almost horizontally flat even though the box consists of thick side walls and fold pieces, by reducing the thickness of each of the superimposed parts of the fold pieces, which form the bottom, according to the number of the parts which are superimposed one on top of the other. CONSTITUTION: Four side walls 3, 5, 7, and 9 forming a body 1 are connected via a hinge 21 and double hinges 20, fold pieces 13, 15, 17, and 19, which form a bottom, are connected to the corresponding side walls via hinges 25 and 29, and by pressing pairs of opposite corners into the direction of the side walls the folding box can be folded into a rhombus. Recesses 23 are made in the front end of each of the fold pieces 13 and 15 which are opposite to each other when the box is set up, and a hinge 27 is formed from the corner of each recess toward the end of corresponding side wall. Further, the thickness of each of parts 3 and 34 which are superimposed to form a two-ply area when the box is set up is half, and the thickness of each of parts 35 and 36 superimposed with the fold pieces 17 and 19 and the fold pieces 13 and 15 to form a three-ply area is a third.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable box in which a box body composed of four peripheral side walls and a foldable bottom surface can fold the peripheral side wall into a rhombus shape.
For details, assemble even the thick side wall and bottom surface,
The present invention relates to a foldable synthetic resin foldable box.

[0002]

2. Description of the Related Art Conventionally, a cardboard box has been generally used as a container for packaging cans such as soft drinks, juice and beer. The cardboard box is unfolded in a horizontal state before being assembled, and can be assembled in the box at the same time as being packed in an automatic packing line of a beverage company, so that it is efficient in transportation and storage. Also, the cardboard box
In the route sales, even when the can is taken out and returned in an empty box state, it can be in an expanded state, so that there is an advantage that it is easy to handle. However, the cardboard box is a one-way disposable and cannot be used repeatedly. On the other hand, in recent years, there has been a demand for resource saving and waste reduction, and the cardboard box has been reviewed from this point as well. Further, in handling, since all are glued and assembled, there is a problem that it takes time to open and fold after use.

On the other hand, as a foldable box which is folded so as not to be bulky when not in use, for example, Japanese Patent Laid-Open No. 6-3
No. 2346 (hereinafter referred to as known example 1) and JP-A-6-
There is one described in Japanese Patent No. 135434 (hereinafter referred to as known example 2). These boxes are configured to be folded in a rhombus shape by pressing the corners of the diagonal parts of the four corners of the peripheral side wall. That is, in each of the boxes described in the above-mentioned publications, four folding pieces forming a bottom surface are integrally connected to the lower side of the four peripheral side walls forming the body, and the protruding pieces are provided on one of the peripheral side walls. A sticking piece is stuck to the peripheral side wall of the other end to form a body of the box, and two of the four folding pieces forming the bottom surface are stuck in the diagonal portions, and the other diagonal portions are stuck together. It is in a free state and the opposite folding pieces are assembled so as to intersect each other. When folding, the diagonal portion in the free state is pressed in the circumferential direction to be deformed into a rhombus shape, and the four folding pieces forming the bottom surface forming portion are folded inside the peripheral side wall.

[0004]

In the foldable box, the known example 1 is used for packaging dried products such as mushrooms, and the known example 2 is related to an outer container such as a gift article. And is formed of a relatively thin film or sheet. Further, these folding boxes are small boxes with a size of several centimeters to several tens of centimeters, and the clear box described in the example of the known example 1 is semi-rigid with a thickness of about 0.3 mm. It is a transparent polyvinyl chloride resin sheet, and the size is 9mm x 6m.
It is m × 10 mm. Therefore, in the folded state, it is not necessary to consider the overlapping thickness of the four folding pieces that form the bottom surface because the upper and lower peripheral side walls overlap in parallel.

However, in a large box for storing heavy items such as canned beverages, paper or a thin resin sheet cannot have sufficient strength to maintain its shape. Therefore, when it is formed of a thick plate, there is a problem that the bottom face cannot be folded in a perfectly horizontal state with a diamond shape due to the overlapping of the folding pieces. As described above, in the case of the cardboard box, there is a problem as described above, although it has been used, and in the folding boxes as in the known examples 1 and 2, a box having a large plate thickness cannot be formed. It was

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and even a box composed of a thick peripheral side wall and a folding piece, has a pair of upper and lower parts which face each other when folded in a diamond shape. (EN) Provided is a foldable box made of synthetic resin in which a peripheral side wall is in a horizontal state.

[0007]

The present invention has the following configuration to achieve the above object. That is, the foldable box made of synthetic resin according to claim 1 of the present invention is composed of four peripheral side walls forming a body, and four foldable pieces forming a bottom surface and continuously connected to the peripheral side walls. In the foldable box that can be folded into a diamond shape by assembling by fixing the folding piece at the corner portion of the diagonal portion and pressing the other free corner portion of the diagonal portion toward the peripheral side wall, Each folding piece is continuously provided via a hinge, and when assembled, the two folding pieces facing each other form a recess at the tip, and a elbow is formed from the corner of the recess toward the end on the side wall side. , When assembled, the double overlapping part is formed to have a thickness of about ½ of the plate thickness, and the triple overlapping part is formed to have a thickness of about ⅓ of the plate thickness, while the other two facing The total thickness of the folded pieces is about one third of the adjacent thickness.
It is characterized in that it is formed to a thickness of.

A synthetic resin foldable box according to a second aspect of the present invention, wherein a folding piece having the entire thickness formed to a thickness of about one third of the adjacent plate is formed from the hinge of the adjacent folding piece to the tip side. It is characterized in that it is formed larger than the triangular portion. Further, in the foldable box made of synthetic resin according to claim 3, among the inclined surfaces of the recess formed at the tip of the folding piece, the corners of the inclined surfaces that slide with each other when folded are formed into rounded or tapered surfaces. Is characterized by. A foldable box made of synthetic resin according to a fourth aspect is characterized in that one or both of the peripheral side wall and the folding piece is provided with a through hole in contact with a hinge. Further, in the foldable box made of synthetic resin according to claim 5, the folding plate forming the bottom surface has a plate thickness dimension of 3 to 6.
It is characterized in that it is mm.

[0009]

Therefore, according to the first aspect of the present invention, the thickness of the overlapping portion of the folding pieces forming the bottom surface is substantially the same as the thickness of the plate, and a smooth bottom surface can be obtained during assembly. . Further, in the second aspect, the folding piece is placed on the hinge to prevent the folding piece from breaking. Further, according to the third aspect, since the contact point is moved smoothly, no extra force is applied during assembly and folding. Further, according to the fourth aspect, it is possible to discharge dust and water from the through hole. In addition, claim 5
In this case, the rib structure can form a firm and safe bottom surface.

[0010]

Embodiments will be described below in detail based on illustrated embodiments. FIG. 1 is a plan view of a developed state before assembly. The assemblable box includes the peripheral side walls 3 and 5 on the long side, the peripheral side walls 7 and 9 on the short side, and the sticking piece 10 connected to the peripheral side wall 3, and the peripheral side walls 3 and 5 on the long side. Folding pieces 13 arranged in series,
15 and the folding piece 1 which is continuously provided on the peripheral side walls 7 and 9 on the short side.
It consists of 7 and 19. And the peripheral side wall 3 on the long side
And the peripheral side wall 7 on the short side, and the peripheral side wall 5 on the long side and the peripheral side wall 9 on the short side are connected to each other via a double hinge 20, respectively. The peripheral side wall 7 on the short side, and the peripheral side wall 3 on the long side and the adhesive piece 10 are continuously provided via a hinge 21. In order to have sufficient strength and prevent deformation, each of the peripheral side walls 3 to 9 and the folding pieces 13 to 19 are formed of a synthetic resin plate having a thickness of 3 to 6 mm, preferably about 5 mm. ing. As the resin to be used, polypropylene is preferable in consideration of moldability and fatigue resistance of the hinges 20 and 21, but resin such as polyethylene and polyvinyl chloride may be used.

Although the hinge 21 has a well-known shape, the double hinge 20 is formed so that the peripheral side walls located above and below when folded are parallel to each other even if the peripheral side wall is thick and the folded piece is thick. As shown in FIGS. 2 and 3, hinges 24 and 26 are formed on both sides of the thin portion 22 having a predetermined width. The width dimension of the thin portion 22 is the folding pieces 13 to 1.
It is appropriately determined by the thickness of 9. The hinges 24, 2
6 is formed with different thicknesses and widths, for example, the hinge 24 adjacent to the peripheral side wall 7 on the short side has a smaller thickness than the hinge 26 adjacent to the peripheral side wall 3 on the long side,
The width dimension is formed large. Therefore, if the thickness of the hinge 24 is t _1, and the thickness of the hinge 26 is t ₂ , then t ₁
<T ₂ , and assuming that the width dimension of the hinge 24 is W ₁ and the width dimension of the hinge 26 is W ₂ , W ₁ > W ₂ .

With the double hinge 20 having the above-mentioned shape, when assembled in a box, it is first bent at the hinge 24 so that the peripheral side wall 3 and the peripheral side wall 5 form a right angle,
When folded, the hinge 26 is bent so that the peripheral side wall 3 and the peripheral side wall 5 overlap each other in parallel. The folding allowance is adjusted by the width dimensions of the thin portion 22 and the hinges 24, 26 (see FIG. 3). The double hinge 20 is
The shapes of the hinges 24 and 26 are not limited to those in the above embodiment as long as the hinges 24 and 26 can be sequentially bent in the bending direction.

Next, the folding pieces 13 to 19 which are continuously provided on the peripheral side walls 3 to 9 will be described. The folding pieces 13 and 15 have the same shape, have a recess 23 at the tip, and are connected to the peripheral side walls 3 and 5 via a hinge 25. An elbow 27 is formed from the corner of the recess 23 toward the end on the side of the peripheral wall. The triangular portion 28 outside the hinge 27 serves as a sticking or heat welding piece with the folding pieces 17 and 19. Folded piece 1 when assembled
3 and the folding piece 15 intersect at the concave portion 23, and the triangular portion 28 and the protruding portion 30 on the opposite side overlap each other. Further, the folding pieces 17 and 19 are formed in the same trapezoidal shape and are connected to the peripheral side walls 7 and 9 via a hinge 29. Further, it is formed to be larger than the triangular portion 28 and has a size protruding from the hinge 27.
By forming the folding pieces 17 and 19 to have a size protruding from the hinge 27, the folded pieces 17 and 19 are placed on the hinge 27 when assembled, so that the hinge 27 is protected and the hinge 27 is protected by the load of the stored items. Prevent it from breaking. Therefore, when assembling, the folding pieces 17 and 19 are fixed to the inside of the triangular portion 28 by sticking or heat welding, and the triangular portion 28 is placed outside at the bottom.

Further, the folding pieces 13 to 19 will be described. The folded thickness when assembled is almost the same as the plate thickness of the folded piece, and the entire folded thickness when folded is two folded pieces. It is formed to have almost the same thickness as the piece. Referring to FIGS. 1, 4 and 5, when assembled, the folding pieces 13, 1
Overlapping area where 5 intersect and overlap (hatched area)
Since 33 and 34 are duplicated, they are formed to have a thickness of about ½. On the other hand, when folded, the folding piece 17,
19 and the overlapping portions (portions shown by vertical lines) 35 and 36 where these and the folding pieces 13 and 15 overlap each other are triple layers, and thus are formed to have a thickness of about one-third. In this way, by adjusting the thickness of the overlapping portion, the thickness can be 3 to 6
Even a synthetic resin plate having a size of mm can be made into a smooth surface without a step on the bottom surface when assembled, and can be made into a smooth plate-like body even when folded. . The sticking piece 10 and the end portion 31 of the peripheral side wall 9 to which the sticking piece 10 is stuck are each formed to have a thickness of about ½ of the plate thickness.

Next, the folding piece 13 and the folding piece 15
Is assembled by partially inclining the inclined surface 37 of the overlapping portion 33 and tilting the two folding pieces while shifting the abutting points so as to rotate, or by raising the two folding pieces while deviating the abutting points. Folded by. Therefore, it is desirable to remove the corners of the inclined surface 37 in order to assemble a folded piece having a large plate thickness and perform folding smoothly. 5 and 6 show the case where the corners of the inclined surface 37 are formed into rounded surfaces, and FIG. 7 shows the case where they are formed into tapered surfaces. When assembling, the folding pieces 13 and 15 are changed from the states of FIGS. 6 and 7.
While the contact point 39 of the is shifted from the bottom to the top,
The folding pieces 13 and 15 become horizontal while sliding 7. When folding, it rises while sliding backwards, the slope 37 goes away, and finally the folding piece 1
Nos. 3 and 15 are in an overlapping state.

Further, through holes 40 and 41 for discharging dust, water and the like are formed at the end edges of the folding pieces 13 to 19 on the side walls 3 to 9 side. The through holes 40 and 41 are preferably formed in contact with the hinges 25 and 29, and the number and size may be appropriately determined depending on the size of the box, the thickness of the plate thickness, and the like. In addition, the through holes 40 and 41 are formed on the peripheral side wall 3 to 3.
It may be provided on the side of the hinges 25 and 29 of 9.

Next, the case of assembling the box from the unfolded state of FIG. 1 will be described. First, the double hinge 20 and the hinge 21 are bent, and the sticking piece 10 is attached to the end 31 of the peripheral side wall 9.
And then fixed to form the body. Next, the folding piece 17 is fixed to the inside of the triangular portion 28 of the folding piece 13 and the folding piece 19 is fixed to the inside of the triangular portion 28 of the folding piece 15 by sticking or heat welding, respectively. At this time, the folding piece 13 and the folding piece 15 are made to intersect each other in the concave portion 23, and the free ends which are not attached are assembled inside the box, that is, so as to overlap with the upper surfaces of the folding pieces 17 and 19 (see FIG. 8). .

Explaining the assembled state on the bottom,
As shown in FIG. 9, the overlapping of the folding piece 13 and the folding piece 15 is such that the overlapping portion 33 of the folding piece 13 and the overlapping portion 34 of the folding piece 15 overlap each other, while the folding piece 13 overlaps with each other.
The overlapping portion 34 of the folding piece 15 is overlapped with the overlapping portion 33. Therefore, in FIG. 9, the overlapping portion 33 intersects, and the entire overlapping portion has a substantially plate thickness,
The folding pieces 13 and 15 are in a substantially horizontal state. Further, in the portion where the folding pieces 17 and 19 overlap, as shown in FIG. 10, the folding piece 13 is on the bottom, the folding piece 17 is in the middle, and the folding piece 15 is on the top in the drawing. Will be).

That is, the folding piece 17 is sandwiched between the overlapping portion 36 of the folding piece 13 and the overlapping portion 35 of the folding piece 15, and the overlapping portion 34 of the folding piece 13 and the folding piece 15 are sandwiched.
Overlaps the overlapped portion 33. Therefore, the overlapping portions of the folding pieces 17 also overlap each other in a substantially horizontal state. In this way, since the thickness of the overlapping portion of each folding piece is adjusted, the bottom surface can be assembled in a horizontal state.

Next, the case of folding will be described.
Of the four folded pieces that form the bottom, the two that overlap in the diagonal part are fixed and the other diagonal parts are not stuck and are in a free state, so the corners of the diagonal part are pressed inward in the circumferential direction. If it does so, it will be deformed into a rhombus shape, and at the same time, it will be bent from the hinge 27, and the four folded pieces will be gradually raised toward the inside and folded (see FIGS. 11 and 12). The folding piece 13 and the folding piece 15 face each other and overlap each other, and at the corners where the folding pieces 17 and 19 are fixed, the folding pieces 17 and 19 and the folding pieces 13 and 15 are formed.
The triangular portion 28 and the triangular portion 28 are respectively folded so that they can be folded into a flat plate with the ridge line at a right angle. Therefore,
Since it is folded into a plate, it is not bulky and does not take up much space when stored or transported. Although the folding piece forming the lid forming portion is omitted in the above embodiment, the folding piece may be provided on the peripheral side wall.

[0021]

In the foldable box made of synthetic resin according to the first aspect of the present invention, the double-overlapped portion when assembled is about ½ of the plate thickness, and the triple-overlapped portion is the plate thickness. The thickness of the other two folded pieces facing each other is formed to be about one-third of the thickness of the adjacent plate. Even a thick folded piece can be assembled with a smooth bottom surface. Also,
In the foldable box made of synthetic resin according to claim 2, since the folding pieces formed to have a thickness of about one-third are formed larger than the triangular portions of the adjacent folding pieces, they are placed on the hinge when assembled. The hinges can be protected to prevent the hinges from being broken by the load of the stored items so that a strong bottom surface can be obtained.

According to the third aspect of the invention, since the corners of the inclined surfaces of the recesses of the facing folding pieces, which are in contact with each other, are formed into the rounded surface or the tapered surface, the folding pieces are smoothly applied without applying any extra force. It can be assembled and folded. Further, according to the fourth aspect, since the through hole is formed in the connecting portion of the peripheral side wall and the bottom surface, dust and water can be discharged. In addition, in the fifth aspect, it is possible to use a folded piece having a rib structure.

[Brief description of drawings]

FIG. 1 is a plan view showing a developed state of a box.

FIG. 2 is a cross-sectional view showing an example of a double hinge.

FIG. 3 is an explanatory sectional view showing a bent state of a double hinge.

FIG. 4 is a partial perspective view for explaining the shape of the plate thickness of the folded piece.

FIG. 5 is a partially enlarged perspective view of the same.

FIG. 6 is a cross-sectional view of an example in which a corner portion of an inclined surface forming a concave portion of a folded piece has a rounded surface.

FIG. 7 is a cross-sectional view of an example in which a corner of an inclined surface forming a recess of a folded piece has a tapered surface.

FIG. 8 is a bottom view of the assembled foldable box.

9 is a cross-sectional view taken along the line AA of FIG.

10 is a sectional view taken along line BB of FIG.

FIG. 11 is a schematic bottom perspective view showing a folded state.

12 is a cross-sectional view taken along line CC of FIG.

[Explanation of symbols]

 1 Body Forming Part 3 Long Side Side Side Wall 5 Long Side Side Side Side Wall 7 Short Side Side Side Side Wall 9 Short Side Side Side Side Wall 10 Sticking Piece 13 Folding Piece 15 Folding Piece 17 Folding Piece 19 Folding Piece 20 Double Hinge 21 Hinge 22 Thin portion 23 Recessed portion 24 Hinge 25 Hinge 26 Hinge 27 Hinge 28 Triangular portion 29 Hinge 31 End portion 33 Overlapping portion 34 Overlapping portion 35 Overlapping portion 36 Overlapping portion 37 Sloping surface 39 Contact point 40 Through hole 41 Through hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Ushio No. 1 Nobezawa, Kaisei-cho, Ashigarakami-gun, Kanagawa Prefecture Meiji Rubber Kasei Kanagawa Plant

Claims (5)

[Claims] 1. A structure comprising four peripheral side walls forming a body, and four folding pieces forming a bottom surface and connected to the peripheral side walls, wherein the folding pieces are fixed at corners of a diagonal portion. Assembled, in a foldable box that can be folded into a rhombus by pressing the corners of the other free diagonal portions in the direction of the peripheral side wall, each peripheral side wall and each folding piece are continuously provided via a hinge, When assembled, the two folding pieces that face each other form a concave portion at the tip, form an elbow from the corner of the concave portion toward the end portion on the side of the peripheral side wall, and when assembled, make a double overlapping portion of the plate thickness. The thickness of about ½ and the triple overlapping portion are formed to be about ⅓ of the plate thickness, while the total plate thickness of the other two facing folded pieces is adjacent to each other. Fold made of synthetic resin characterized by being formed to a thickness of about one third of the plate thickness A foldable box. 2. The folding piece formed as a whole with a thickness of about one third of the adjacent plate thickness is formed larger than the triangular portion formed on the tip side from the hinge of the adjacent folding piece. The foldable box made of synthetic resin according to claim 1. 3. The inclined surface of the concave portion formed at the tip of the folding piece is formed into a rounded surface or a tapered surface at the corners of the inclined surfaces that slide with each other when folded. A foldable box made of synthetic resin according to 2. 4. The synthetic resin fold according to claim 1, wherein one or both of the peripheral side wall and the folding piece are provided with a through hole in contact with the hinge. Flexible box. 5. The synthetic resin foldable box according to claim 1, wherein the folding piece forming the bottom surface has a thickness of 3 to 6 mm.