JPH09315428A - Freely foldable box made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembling and folding works of a box by folding side plates opposite to each other inwardly into two by a hinge, continuously providing a bottom plate on the side plates through the hinge, and folding the bottom plate inwardly. SOLUTION: When a box in a developed condition is assembled, a bottom plate 10 is folded inwardly of a side plate 5, the side plates 2-5 are folded from a hinge 11, and an attachment piece 7 is welded to an attachment part 15 of the side plate 5 to form a peripheral wall of the box. After the peripheral wall of the box is formed, the bottom plate 10 which is folded inwardly of the side plate 5 is collapsed and loaded on a projection 20 and a stepped part 33 and locked thereto. The side plates are integratedly assembled without being folded by the bottom plate 10. When an empty box is folded, the bottom plate 10 is folded from a part of a hinge 37 and erected on the inner side of the side plate 5. When the part of the hinge 37 of the side plates 2, 4 is pushed inwardly, the side plates 2, 4 are folded into two by the hinge 17, and the side plates 3, 5 are brought close to each other in a parallel condition and completely folded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar rectangular synthetic resin foldable box having four peripheral side walls, and more specifically, a synthetic resin foldable box in which the opposite side plates are folded inward. Regarding the flexible box.

[0002]

2. Description of the Related Art Conventionally, a container for packaging cans such as soft drinks, juice and beer, or a container for packing soy sauce, edible oil, wine, etc. in a synthetic resin bag, the so-called back-in-box. The cardboard box is used for. Such a cardboard box is folded in a horizontal state until it is used, and is assembled at the time of use, so that transport and storage efficiency is high. Moreover, it is lightweight, easy to handle, and inexpensive. However, cardboard boxes are one-way, cannot be used repeatedly, and are disposable. In addition, there is a problem that it takes time to open and fold after use since it is glued and assembled in handling.

On the other hand, various structures have been proposed as foldable boxes which are made of synthetic resin so as not to become bulky when not in use, but the bottom plate is formed inside the box while the side plates are deformed into diamond shapes. As a box that can be folded into a box, Japanese Patent Laid-Open No. 6-
There is Japanese Patent No. 135434 (hereinafter, known example 1),
Japanese Patent Laid-Open No. 63-162458 (hereinafter referred to as known example 2) and the like can be used as a box to be assembled from a state of being developed on one plate. In the above-mentioned known example 1, four folding pieces forming a bottom face are integrally connected to the lower side of the four side plates, and a sticking piece protruding from one of the side plates is attached to the other side plate. To form the body of the box. Next, of the four folded pieces forming the bottom surface, two pieces at the diagonal portions are adhered to each other, and the other diagonal portions are not adhered to each other to be free, and the opposed folded pieces are assembled so as to intersect each other. . When folding, the diagonal part in a free state is pressed in the circumferential direction to be deformed into a rhombus shape, and the four folded pieces forming the bottom surface forming part are folded inside the side plate. Further, the box of the known example 2 is an assembly box that is formed by connecting a square bottom plate, a side plate, and a lid plate via a hinge portion, and can be easily assembled from an expanded state, and can be easily expanded. is there.

[0004]

The packaging container of the above-mentioned known example 1 is a container for packaging mushrooms, which is formed of a thin resin sheet. After storing the contents, the packaging container is folded into a gusset of a plastic film. Inserted into a velvet bag and packaged. Therefore, the assembly of the lid is not described.
Further, in the assembling box of the publicly known example 2, the lid is formed of a foamed thermoplastic resin, and the lid is fitted with a fitting protrusion provided at a tip end of each side plate into a fitting groove provided on the back surface of the cover plate. It is excellent in airtightness because it is a foam. However, since it is only the fitting by the fitting groove and the fitting projection, it is not possible to securely hold the closed state as a box for storing heavy objects and obliquely or horizontally stacked during transportation. There is a problem. In addition, assembling from the unfolded state is troublesome, and it is stored for unfolding into one plate.
There is a problem of taking up space for transportation.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a foldable box made of synthetic resin which is easy to assemble and fold and can be folded into a small size.

[0006]

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 a box having a flat rectangular shape composed of four side plates continuously provided via a hinge, and is provided in a substantially central portion of two facing side plates. A vertical hinge is provided, and the other two side plates opposite to each other are provided with connecting portions bent at right angles at both ends, and at least one side plate is provided with a bottom plate continuously via a hinge. A hinge is provided between the portion and a side plate provided with a hinge in the vertical direction at a substantially central portion. Further, the foldable box made of synthetic resin according to a second aspect of the present invention is characterized in that a protrusion for locking the bottom plate is provided at a lower end portion of a side plate provided with a vertical hinge at a substantially central portion. Further, in the foldable box made of synthetic resin according to claim 3, the side plates are assembled in such a manner that a side plate provided with a vertical hinge at a substantially central portion is provided with a sticking piece continuously connected via a hinge to a connecting part of adjacent side plates. It is characterized by being attached to and assembled in a square shape in a plane. Further, in the foldable box made of synthetic resin according to claim 4, assembling of the side plate is such that the arrow-shaped hook is projected on the sticking piece which is continuously connected via the hinge to the side plate having the vertical hinge at the substantially central portion. Then, the hooks are inserted into the through holes for hooks formed in the connecting portions of the adjacent side plates to assemble into a rectangular shape in a plan view. Further, in the foldable box made of synthetic resin according to claim 5, one of the side plates having connecting portions bent at right angles on both ends thereof is provided with a bottom plate continuously via a hinge and the other side plate. It is characterized in that a protrusion for locking the bottom plate is provided. Further, in the foldable box made of synthetic resin according to claim 6, a lid plate is continuously provided via a hinge to at least one upper end of a side plate provided with connecting portions bent at right angles on both side ends. Characterize.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiment will be described below in detail. FIG. 1 is a plan view of a foldable box used as a back-in box, which is seen from the inner surface in a deployed state before assembly. The foldable box 1 has four side plates 2, 3, 4 and 5, a sticking piece 7 connected to the side plate 2, a lid plate 9 connected to the side plate 3, and further to the side plates 5. It is composed of a series of bottom plates 10.
The side plates 2 to 5 are connected to each other via a hinge 11, and the side plate 2 and the adhesive piece 7 are connected to each other via a hinge 13. At both ends of the side plates 3 and 5, connecting portions 12 are provided at right angles for accommodating the bottom plate 10 and the side plates 2 and 4 when folded.
2 are connected to each other via a hinge 11 provided therebetween. Therefore, when assembled, the connecting portion 12 and the side plates 2 and 4 are flush with each other.

Each side plate forming the peripheral wall of the box has sufficient strength and a plate thickness for preventing deformation, or is a synthetic resin plate reinforced by a reinforcing rib structure that runs vertically and horizontally or diagonally. Has been formed. Also, the adhesive piece 7
As shown in FIGS. 2 and 3, the sticking portion 1 which is thinner than each side plate and is provided inside the connecting portion 12 of the side plate 5.
5 (see FIG. 3). By welding the sticking piece 7 to the sticking portion 15, a box-shaped body portion having a quadrangular plane is formed.

Next, the structure of the side plates 2 and 4 will be described. The inner surface of the substantially central portion (the surface inside the box) is
A hinge 17 is formed in parallel with the hinge 11. By this hinge 17, the side plates 2 and 4 are folded inward in two. Further, an engaging projection 19 that fits with the lid plate is provided on the end surface of the side plates 2 and 4 on the lid plate side (the surface that becomes the upper end when assembled in the box), and the end surface on the opposite side (assembled in the box). A projection 20 that locks the bottom plate 10 is provided on the surface that serves as the lower end when the projection is made. Explaining the structure of the engaging projection 19, as shown in FIG. 4, the engaging projection 21 is composed of an engaging piece 21 and a fitting piece 23 so that they can be easily fitted but not accidentally disengaged. A slit 25 is provided between them.

A concave portion 27 is provided on the outer side surface of the engaging piece 21 so as to be firmly fitted into a fitting groove 30 of a lid plate which will be described later. Further, an inclined surface 29 is formed to facilitate fitting of the fitting piece 23. By providing the slit 25, the engaging piece 21 and the fitting piece 23 have a slight elasticity, and it is possible to easily fit the lid plate and to securely maintain the engaged state after the fitting. The protrusion 20 for locking the bottom plate 10 is provided slightly above the lower end faces of the side plates 2 and 4. The engaging projection 19 and the projection 20 are divided by a slit 17.

Further, as shown in FIG. 6, a protrusion 31 is formed inside the connecting portion 12 at the lower end of the side plate 3, and a step portion 33 for locking the bottom plate 10 and a side plate are formed on the upper surface of the protrusion 31. A step portion 35 that locks the two or four protrusions 20 is formed in a step shape. Therefore, when assembled, the bottom plate 10 is placed on the step portion 33 and the protrusion 20, and when folded, the protrusion 20 is placed on the step portion 35 (see FIGS. 11 and 12).
Since the step portion 35 is for ensuring the engagement state when folded, the step portion 35 can be appropriately omitted. When the step portion 35 is omitted, only the step portion 33 is provided, that is, the protrusion at the height position of the step portion 33 may be used. Further, as shown in FIG. 7, the bottom plate 10 is continuously provided inside the side plate 5 via a hinge 37. The bottom plate 10 has a hinge 37.
It is formed so that it can be bent freely, is bent vertically inside the side plate 5, and is horizontally locked to the projection 20 and the step portion 33 when assembled.

On the other hand, the cover plate 9 is continuously provided via a hinge 39, and the engagement projections 19 projecting from the upper ends of the side plates 2 and 4 and the side plate 5 are fitted to the inner surface of the peripheral edge when closed. A fitting groove 30 is formed. The fitting groove 30 is sized to fit the engaging projection 19, and an engaging projection 40 is formed on the outer surface of the groove, and an inclined surface 41 with the corner cut off is formed on the inner surface (FIG. 4). reference). Further, a hinge 38 is provided on the cover plate 9 in parallel with the hinge 39, and a through hole 43 and a cap 45 are provided at the tip. The hinge 38 is for abutting the lid plate 9 so as to be wound around the outside of the side plate when folded, and the width dimension of the hinge 38 and the hinge 39 is slightly smaller than the total thickness of the side plate when folded. Largely formed. The through hole 43 is for taking out the spout of the liquid bag housed inside, and is closed by a cap 45 during storage and transportation. As shown in FIGS. 1 and 8, the cap 45 is attached to the through hole 43 so as to be freely fit and is connected by a thin connecting band 47 continuously provided on the tip end surface. The cap 45 is bent at the connecting band 47 and attached to the through hole 43.

In the above embodiment, as is clear from the above description, the lid plate 9 and the bottom plate 10 are one-piece structures and are connected to other side plates facing each other, but they are connected to the same side plate. You may set it up. When the bottom plate 10 is connected to the lower end of the side plate 3, the protrusion 31 having the step portions 33 and 35 may be formed at the lower end of the side plate 5.

Next, the case of assembling the box from the unfolded state of FIG. 1 will be described. First, the bottom plate 10 is bent inside the side plate 5, the side plates 2 to 5 are bent from the hinge 11, and the sticking piece 7 is welded to the sticking portion 15 of the side plate 5 to form the peripheral wall of the box. After forming the peripheral wall of the box in this way, the bottom plate 1 bent inside the side plate 5 is formed.
0 may be tilted and placed on the protrusion 20 and the stepped portion 33 and locked. The bottom plate 10 allows the side plates to be integrally assembled without bending (see FIG. 9). When closing the lid plate 9, the side plate 2, while bending from the hinge 39 and rotating.
It may be pressed to the upper end of No. 4. While the lid plate 9 is falling down, the engaging projections 19 of the side plates 2 and 4 are first pushed into the fitting groove 30, and finally the fitting projection 30 of the side plate 5 is fitted into the fitting groove 30 at the tip.
9 is pushed in. Thereby, the lid plate 9 and the side plates 2, 4
And 5 are assembled together to prevent bending of the box. The cap 45 of the cover plate 9 may be bent in advance from the connecting band 47 and fitted into the through hole 43. On the other hand, when the lid plate 9 is opened, contrary to when it is closed, first, the lid plate 9 is opened.
Should be raised. By pulling up the cover plate 9, the fitting state between the fitting groove 30 and the engaging projection 19 is released.

Next, the case of folding an empty box will be described. After the lid plate 9 is opened, the bottom plate 10 is bent from the hinge 37 and is raised inside the side plate 5. After that, as shown in FIG. 10, when the hinges 17 of the side plates 2 and 4 are pushed inward, the side plates 2 and 4 are separated by the hinges 17.
At the same time, the side plates 3 and 5 approach each other in parallel. And when it is completely folded, the side plate 2,
The protrusion 20 of No. 4 is placed on the step portion 35 and is housed inside the connecting portion 12. Next, the cover plate 9 may be bent at the hinge 38 and brought into contact with the outer surface of the side plate 5 (see FIGS. 11 and 12).

FIG. 13 shows another embodiment of the connecting structure of the side plates 2 and 5 and corresponds to FIG. This embodiment is assembled together by fitting without welding. A notch 4 for positioning the sticking piece 7 on the inner surface of the tip of the connecting portion 12 of the side plate 5.
9 is formed, and a recess 50 is formed on the outer side thereof, and the recess 50 has a hook through hole 51 penetrating to the notch 49 side.
Has been drilled. On the other hand, an arrow-shaped hook 53 fitted into the hook through hole 51 is projectingly provided on the outer surface of the sticking piece 7 continuously provided on the side plate 2 via the hinge 13. The side plate 2 and the side plate 5 are integrally connected by inserting the hook 53 into the hook through hole 51, and are folded by the hinge 13. The side plate 2 and the side plate 5 may be connected to each other by providing a hook through hole in the attaching piece 7 and projecting an arrowhead-shaped hook in the connecting portion 12, contrary to the above configuration. Further, the side plates 2 and 5 can be changed to other forms such as having reinforcing ribs on the outer surfaces.

FIGS. 14 and 15 show another embodiment of the through hole and the cap provided in the lid plate. In the above embodiment, the through hole and the cap are provided in the same lid plate. Is divided into two and one cover plate is provided with a through hole, and the other cover plate is provided with a cap. That is, the lid plates 55 and 57 are attached to the upper ends of the side plate 3 and the side plate 5, respectively.
8, the cover plate 55 is provided with a through hole 60, and the cover plate 5
This is a case where the cap 61 is connected to 7 through the connecting band 61a. Also in this embodiment, the fitting groove 30 is provided on the inner edge of the lid plate, and the fitting projection 19 provided on the upper ends of the side plates 2 and 4 can be fitted therein.

As described above, when the through hole and the cap are provided on separate lid plates, the caps are attached to connect the lid plates to each other, so that the lid plates can be fitted more firmly. it can. In any of the above embodiments, the fitting shape between the cap and the through hole can be arbitrarily changed as long as it is detachable, and is not particularly limited. When the lid plates are connected to the opposing side plates as in this embodiment, the lid plates may be erected in the same direction as the side plates when folding, or may be bent outside the side plates.

FIG. 16 shows another embodiment of the bottom plate. That is, in the above-described embodiment, the lid plate is a single plate as shown in FIG. 1, but like the lid plate, the side plate 3 and the side plate 5 are provided with the bottom plate 63 and the bottom plate 65, respectively. The faces are butted or overlapped. Also in this embodiment, when the box is folded, the bottom plate 63 and the bottom plate 65 are respectively bent from the hinge portions so that the side plate 3,
It may be brought into contact with the inside of the side plate 5. Even when the bottom plate is divided into two as in this embodiment, it is preferable that the bottom plate is placed on the projection 20 projecting from the side plates 2 and 4 when assembling.

In the above embodiment, the foldable box used as the back-in box has been described. However, if the side plate and the bottom plate have the same structure, the structure of the lid plate is not particularly limited, and the back-in box is not limited. Of course, it can be used as a foldable box other than the above. In this case, the through hole and the cap of the lid plate can be omitted. Further, the structure for locking the lid plate and the combination of the fitting groove on the inner surface of the lid plate and the engaging projection on the upper end of the side plate are not limited to the embodiment, and can be changed to known means. . Further, the cover plate may be omitted as appropriate according to the use of the box.

[0021]

In the foldable box made of synthetic resin according to the present invention, the opposite side plates are folded inward by two hinges, and the bottom plate is connected to the foldable side plates via the hinges. Since it is folded back inward from the hinge, the box can be assembled and folded freely.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of main parts showing a side plate connection structure.

FIG. 4 is a cross-sectional view of the fitting groove of the cover plate and the engaging projection of the side plate before fitting.

FIG. 5 is a cross-sectional view of essential parts showing the structure of the lower ends of the side plates 2 and 4.

FIG. 6 is a cross-sectional view of an essential part showing the structure of the lower end of the side plate 3.

FIG. 7 is a cross-sectional view of an essential part showing a structure with a bottom plate at a lower end portion of a side plate 5.

FIG. 8 is a cross-sectional view of an essential part showing a structure of a through hole and a cap in a cover plate.

FIG. 9 is a cross-sectional view of the box in an assembled state.

FIG. 10 is a partial cross-sectional perspective view for explaining a state in which the box is folded, in which the fitting groove of the lid plate and the engaging projection of the side plate are omitted.

FIG. 11 is a vertical cross-sectional view of a folded state of the box in which the fitting groove of the lid plate and the engaging projection of the side plate are omitted.

FIG. 12 is likewise a vertical cross-sectional view of a folded state of the box in which the fitting groove of the lid plate and the engaging projection of the side plate are omitted.

FIG. 13 is a cross-sectional perspective view of an essential part showing a side plate assembly structure according to another embodiment.

FIG. 14 is a sectional view of an essential part of another embodiment in which a cover plate is divided into two pieces.

FIG. 15 is another embodiment in which the cover plate is divided into two pieces, and the through hole and the cap are formed separately.

FIG. 16 is a cross-sectional view of an essential part of another embodiment in which the bottom plate is divided into two pieces.

[Explanation of symbols]

 1 Foldable Box 2 Side Plate 3 Side Plate 4 Side Plate 5 Side Plate 7 Adhesive Piece 9 Lid Plate 10 Bottom Plate 11 Hinge 12 Connecting Part 13 Hinge 15 Adhesive Part 17 Hinge 19 Engagement Projection 20 Protrusion 21 Engagement Piece 25 Slit 27 concave portion 29 inclined surface 30 fitting groove 31 protrusion 33 step portion 35 step portion 37 hinge 38 hinge 39 hinge 40 locking protrusion 41 inclined surface 43 through hole 45 cap 47 connecting band 49 notch 50 concave portion 51 hook through hole 53 Arrow-shaped hook 55 Cover plate 57 Cover plate 58 Hinge 60 Through hole 61 Cap 63 Bottom plate

Claims (6)

[Claims] 1. A box having a rectangular shape in plan view composed of four side plates connected to each other via a hinge, wherein a vertical hinge is provided at approximately the center of two facing side plates, and two other facing side plates are provided. The side plate is provided with connecting portions bent at right angles on both ends, and at least one side plate is connected with a bottom plate via a hinge, and a vertical hinge is provided at the connecting portion and substantially in the center. A foldable box made of synthetic resin, characterized by having a hinge between it and the side plate. 2. The foldable box made of synthetic resin according to claim 1, wherein a protrusion for locking the bottom plate is provided at a lower end portion of a side plate provided with a vertical hinge at a substantially central portion. 3. The side plate is assembled in a planar rectangular shape by attaching a sticking piece continuous to a side plate having a vertical hinge at a substantially central portion via a hinge to a connecting portion of an adjacent side plate. The foldable box made of synthetic resin according to claim 1 or 2, characterized in that. 4. A side plate is assembled by forming an arrowhead-shaped hook on a sticking piece connected to a side plate having a vertical hinge at a substantially central portion through the hinge, and connecting the hook to adjacent side plates. The foldable box made of synthetic resin according to claim 1 or 2, wherein the foldable box made of synthetic resin is inserted into a through hole for a hook formed in the portion and assembled in a rectangular shape in a plane. 5. A bottom plate is continuously provided to one of the side plates provided with connecting portions bent at right angles at both ends through a hinge, and a protrusion for locking the bottom plate is provided on the other side plate. The foldable box made of synthetic resin according to claim 1, wherein the foldable box is made of synthetic resin. 6. A lid plate is continuously provided via a hinge to at least one upper end of a side plate provided with connecting portions bent at right angles on both side ends.
A foldable box made of the synthetic resin according to any one of 5 above.