JP3055871B2 - Foldable box made of synthetic resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat rectangular box made of synthetic resin having four peripheral side walls, a bottom, and a lid, and more particularly, to folding the opposing side plates inward so that the whole is freely foldable. And a folded box made of synthetic resin.

[0002]

2. Description of the Related Art Conventionally, containers for packaging canned containers of soft drinks, juices, beers, and the like, or containers for filling soy sauce, edible oil, wine, and the like in synthetic resin bags and packing the bags, so-called back-in-boxes Uses a cardboard box. 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 and cannot be used repeatedly, and are therefore 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.

[0003] On the other hand, various types of foldable boxes have been proposed as a foldable box made of a synthetic resin box so as not to be bulky when not in use. As a box that can be folded into
There is JP-A-135434 (hereinafter referred to as known example 1),
Japanese Patent Application Laid-Open No. 63-162458 (hereinafter referred to as "known example 2") discloses an example of a box assembled from a state in which the box is developed on a single 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, the freely assemblable box of the publicly known example 2 is formed of a foamed thermoplastic resin, and the lid has a fitting groove provided on the back surface of the cover plate fitted with a fitting protruding piece provided at the tip of each side 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 during 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 small.

[0006]

The present invention has the following configuration to achieve the above object. In other words, 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 connected via a hinge, and the two side plates opposed to each other have a substantially central portion. A vertical hinge is provided at the lower end, and a bonding piece divided at the hinge position is continuously provided at the lower end via a hinge, while a hinge is provided at a lower end of another opposed side plate not provided with a vertical hinge. When a bottom plate is continuously provided, the bottom plate extends from a hinge for continuously connecting the side plates and is formed into three folded pieces by two hinges whose ends are connected to each other, and is assembled to one of the folded pieces located on the outside. The overlapping portion protrudes from the bottom plate on the other side, and the folded piece located on the outside is attached and assembled integrally with the attaching piece connected to the adjacent side plate, and the side plate is assembled via a hinge. On the outer surface of the connecting plate An arrowhead-shaped hook is protruded, and the arrowhead-shaped hook is inserted into a hook through hole formed in an adjacent side plate from inside to assemble into a square shape. Further, the foldable box made of synthetic resin according to claim 2 is characterized in that a lid plate is continuously provided via a hinge at an upper end of a side plate formed by connecting the bottom plate. In addition, the foldable box made of synthetic resin according to claim 3 is characterized in that a lid plate is continuously connected via a hinge to one of the upper ends of the side plates connected to the bottom plate. Further, in the synthetic resin foldable box according to claim 4, a fitting groove is provided on an inner surface of the cover plate, and an engaging projection fitted to the fitting groove is provided at an upper end of a side plate not provided with the cover plate. And the cover plate is closed by the fitting groove and the engaging projection.

[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, viewed from an outer surface in a developed state before assembly. The foldable box 1 includes four side plates 2, 3, 4 and 5, a sticking piece 7 connected to the side plate 2, and lid plates 9, 10 connected to the side plates 2 and 4.
And bottom plates 11, 13 connected to the side plates 2, 4. The side plates 2 to 5 are continuously provided via a hinge 15, and the side plate 2 and the attaching piece 7 are connected to each other by the hinge 1.
7 are provided continuously. Each side plate is formed of a synthetic resin plate having a sufficient strength and a thickness to prevent deformation, or reinforced by a rib structure. As shown in FIG. 2, the sticking piece 7 has a smaller thickness than each side plate, and is welded to a sticking portion 19 formed thinly at an end of the side plate 5.

Next, the structure of the side plates 3 and 5 will be described. A hinge 20 is formed on the inner surface substantially at the center (the surface opposite to the surface on which the hinges 15 and 17 are formed) in parallel with the hinge 15. ing. The side plates 3 and 5 are folded inward by the hinge 20. Also, the side plates 3, 5
An engaging projection 21 that fits with the lid plate protrudes from an end surface on the lid plate side (upper end when the box is assembled), and sticking pieces 23 of the bottom plates 11 and 13 are connected to the opposite end surface. Has been established. The sticking piece 23 is divided at the position of the hinge 20. Therefore,
The engaging projection 21 and the sticking piece 23 are provided on both sides of the hinge 20 and do not hinder the operation of the hinge. As shown in FIG. 3, the engaging projection 21 is provided with an engaging piece 25 and a fitting piece 2 so that the fitting is easy but does not come off.
6 and a slit 27 is provided between the two. A concave portion 28 is provided on the outer surface of the engaging piece 25 to firmly fit the fitting groove of the cover plate. An inclined surface 29 is formed to facilitate the fitting of the fitting piece 26. By providing the slit 27, the engaging piece 25 and the fitting piece 26 have a slight elasticity, so that the fitting to the cover plate is facilitated and the engaged state can be reliably maintained after the fitting.

On the other hand, the cover plates 9 and 10 are continuously provided via hinges 18 and have a length dimension that is about half the width of the side plates 3 and 5, and when the cover plates are closed, the engaging projections are formed. A fitting groove 30 in which the fitting 21 is fitted is formed. The fitting groove 30 is sized to fit the engaging protrusion 21, and the engaging protrusion 31 is formed on the outer surface of the groove, and the inclined surface 33 with a corner cut off is formed on the inner surface. ). Further, an upward step portion 35 for overlapping with the lid plate 10 is formed at the tip of the lid plate 9,
A notch 37 is formed at the approximate center in the width direction to allow the cap connecting band of the cover plate 10 to escape.

The cover plate 10 has a fitting groove 30 similar to the cover plate 9.
Are formed, and a through hole 39 and a cap 40 are provided. The through hole 39 is for taking out a spout of a liquid bag housed therein, and is closed by a cap 40 during storage and transportation. The cap 40
As shown in FIG. 4, it is attached to the through hole 39 so as to be freely fitted, and is connected by a thin connecting band 41 provided continuously on the distal end surface. The cap 40 is bent at the connection band 41 and attached to the through hole 39. Further, the cover plate 10
Is provided with a downward step 42 for overlapping with the cover plate 9.

Next, the configuration of the bottom plates 11 and 13 will be described. The bottom plates 11 and 13 are connected to each other via a hinge 43, and three folded pieces 49, 50 and 51 are provided by hinges 45 and 47 which extend from the end of the hinge 43 and are connected at the ends.
Is formed. A welding portion 53 for welding the sticking piece 23 is formed at a side end of the folding pieces 50 and 51. An overlapping portion 55 projecting from the front end surface of the folding piece 50 is provided so as to overlap the bottom plate of the mating side when assembled. When assembled, the overlapping portions 55 are interleaved with each other and overlap with the inner surface of the mating bottom plate to be locked.

Next, the case of assembling into a box from the unfolded state shown in FIG. 1 will be described. First, the sticking piece 7 bent from the hinge 15 is welded to the sticking portion 19 of the side plate 5 to form the peripheral wall of the box. Next, the sticking pieces 23 connected to the side plates 3 and 5 are welded to the welding portions 53 of the bottom plates 11 and 13. Bottom plate 11, 13
When the adhesive pieces 23 adjacent to the bottom plate 11 are welded, the bottom plates 11 and 13 face each other, and the overlapping portion 55 of the bottom plate 11
Of the bottom plate 13
The overlapping portion 55 overlaps with the inner surface of the folding piece 51 of the bottom plate 11 and is locked, so that the tip end surfaces of the folding piece 51 come into contact with each other. The distal end surfaces of the bottom plates 11 and 13 are in a free state without welding and can be freely folded.

When closing the cover plates 9 and 10, the hinge 18
It is sufficient to press against the upper ends of the side plates 3 and 5 while bending and turning. As the cover plates 9 and 10 fall, the engaging projections 21 are pushed into the fitting grooves 30, and the downward step portions 42 of the cover plate 10 overlap the upward step portions 35 of the cover plate 9 to be completely closed. Thereby, the bending of the box in which the lid plates 9 and 10 and the side plates 3 and 5 are integrally assembled is also prevented. The cap 40 of the cover plate 10 may be bent in advance from the connecting band 41 and fitted in the through hole 39. On the other hand, cover plates 9, 10
Is opened, the lid plate 10 is pulled up first, and then the lid plate 9 is pulled up. By pulling up the lid plate, the fitting state between the fitting groove 30 and the engaging projection 21 is released.

Next, a case where an empty box is folded will be described. After the cover plates 9 and 10 are opened, the hinges 2 of the side plates 3 and 5
When the part No. 0 is pushed inward, the side plates 3 and 5
At the same time as the bottom plates 11, 13
Of the folded pieces 50 and 51 are pushed inward. When the welding portion 53 is pushed inward, the bottom plate 1
1 and 13 are not welded, and the hinge 43
Folds 49, 50,
Numeral 51 is folded up while standing up around the joint between the hinges 45 and 47. At this time, the side plates 2 and 4 approach in a parallel state. When completely folded, the bottom plate 11 is sandwiched between the side plates 2 and the side plates 3 and 5 on the side adjacent to the side plate 2, and the bottom plate 13 is located on the side plate 4 and the side plates 3 and 5 on the side adjacent to the side plate 4. The outer surface of the side plate 3 and the outer surface of the side plate 5 are bent from the hinge 20 to abut against each other (see FIG. 7).

FIG. 8 shows another embodiment of the method of connecting the side plates 2 and 5 in FIG. In this embodiment, the members are integrally assembled by fitting without welding. A notch 57 for positioning is formed on the inner surface of the tip of the side plate 5, and a concave portion 59 is formed on the outer side.
Are formed, and a through hole 60 for a hook penetrating the concave portion 59 is formed. On the other hand, the side plate 2 has a hinge 61.
The connecting plate 63 is continuously provided via the . The connection plate 63
Is approximately the same as the thickness of the side plate 2 and the connecting plate 63
Is formed so as to be superimposed on the end face of the side plate 2.
In addition, an arrowhead-shaped hook 65 that is fitted into the hook through-hole 60 is protruded from the outer surface. Plate the hook 65
The side plate 2 and the side plate 5 are integrally connected by being fitted into the through holes 60 for hooks from the inside thereof , and are folded by hinges 61. The connection between the side plate 2 and the side plate 5 can be changed to another state such as having a reinforcing rib as long as it can be assembled integrally.

FIG. 9 shows another embodiment of the through hole and the cap provided on the cover plate. In the above embodiment, the through hole and the cap are provided on the same cover plate. It is a case where it is provided in. That is, referring to FIG. 1, the cap 40 is attached to the cover plate 9 via the connecting band 41a.
a in a row, and the cover plate 10 is provided with a through hole 39a. As described above, when the through hole and the cap are provided on different lid plates, the mounting of the cap connects the lid plates, so that the lid plate can be more firmly fitted. 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.

FIGS. 10 and 11 show another embodiment of the cover plate. That is, in the above-described embodiment, the lid plate is divided into two and connected to the side plate 2 and the side plate 4, respectively. In this embodiment, the lid plate is a one-piece structure connected to either the side plate 2 or the side plate 4. . That is, the lid plate 67 is connected to the side plate 4 via the hinge 18 similarly to the lid plate 10 shown in FIG. 1, and has a through hole 39 for taking out a spout of the liquid bag stored therein.
b, and a cap 41b is connected to the end by a connecting band 41b. When the spout of the stored liquid bag is not used, the cap 40b is bent at the connecting band 41b and attached to the through hole 39b. Fitting grooves 69 and 70 are provided on the inner peripheral edge of the cover plate 67, and the engaging projections 21 protruding from the upper ends of the side plates 3 and 5 are fitted into the fitting grooves 69. An engagement projection 21a protruding from the upper end of the side plate 2 is fitted into 70.

When the cover plate is made of a single structure as in the embodiment shown in FIG. 10, a hinge 71 parallel to the hinge 18 is used.
Is preferably provided. When the hinge 71 is provided, it is bent at the hinge 71 as shown in FIG.
This facilitates the opening and closing of the cover plate 67 and allows the liquid bag to be taken in and out while the side plate is assembled with the cover plate.

In the above embodiment, the foldable box used as the back-in box has been described. However, the structure of the lid plate is not particularly limited as long as the side plate and the bottom plate have the same structure. In addition, it can be used as a foldable box other than the back-in box. 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.

[0020]

According to the foldable box made of synthetic resin according to the present invention, the opposing side plate is folded inward by a hinge and the bottom plate is connected to the side plate adjacent to the hinged side plate. Since it is folded into three triangles via the hinge and the bottom plate is attached to the sticking piece connected to the adjacent side plate, the entire box can be folded and assembled by folding or expanding the side plate. Also, the side plates are assembled via hinges.
Arrow-shaped hooks protrude from the connecting plate
Assemble into a square shape by inserting it into the hook hole
Is assembled together by fitting without welding
Can be.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a main part in a case where a side plate is assembled with a sticking piece.

FIG. 3 is a cross-sectional view of a fitting groove of a cover plate and an engaging protrusion of a side plate before fitting.

FIG. 4 is a sectional view of a main part showing a structure of a through hole and a cap in a cover plate.

FIG. 5 is an explanatory perspective view of a state where the box is assembled.

FIG. 6 is a sectional view showing an assembled state of a bottom plate.

FIG. 7 is a sectional view showing a folded state. It is a principal part sectional view similarly.

FIG. 8 is a perspective view of a main part showing an assembling structure of a side plate according to another embodiment.

FIG. 9 is a cross-sectional view of a main part of another embodiment in which a lid plate provided with a through hole and a lid plate provided with a cap are separately formed.

FIG. 10 is an exploded view of a main part of another embodiment in which a single incidental structure is used.

FIG. 11 is an explanatory sectional view of the embodiment shown in FIG. 10 in a state in which a lid is closed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foldable box 2 Side plate 3 Side plate 4 Side plate 5 Side plate 7 Adhesion piece 9 Cover plate 10 Cover plate 11 Bottom plate 13 Bottom plate 15 Hinge 17 Hinge 18 Hinge 19 Adhesion part 20 Hinge 21 Engagement projection 23 Adhesion piece 25 Engagement Piece 26 fitting piece 27 slit 28 recess 29 inclined surface 30 fitting groove 31 locking projection 33 inclined surface 35 upward step 37 notch 39 through hole 40 cap 41 connecting band 42 downward band 43 hinge 45 hinge 47 hinge 49 folding piece Reference Signs List 50 Folding piece 51 Folding piece 53 Welding part 55 Overlapping part 57 Notch 59 Recess 60 Hook through hole 61 Hinge 63 Connecting plate 65 Arrowhead hook 67 Cover plate 69 Fitting groove 70 Fitting groove

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-321233 (JP, A) Japanese Utility Model Showa 53-60439 (JP, U) Japanese Utility Model Showa 51-102435 (JP, U) Japanese Utility Model Showa 47- 40938 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 5/00-13/02

Claims (4)

(57) [Claims] 1. A flat rectangular box comprising four side plates connected to each other via a hinge, wherein two opposing side plates are provided with a vertical hinge at a substantially central portion, and a lower end of the hinge is provided at a lower end. Attachment pieces divided at the positions are continuously connected via a hinge, while a bottom plate is continuously provided via a hinge at a lower end of another opposed side plate not provided with a vertical hinge, and the bottom plate is connected to the side plate. It is formed into three folded pieces by two hinges extending from the hinges connected to each other and having a leading end connected thereto, and one of the folded pieces located on the outer side is provided with a projected portion overlapping with the bottom plate of the other side when assembled. The folded-back piece located on the outside is attached and assembled integrally with the sticking piece continuously provided on the adjacent side plate, and the side plate is assembled by attaching an arrowhead-shaped hook to the outer surface of the connecting plate continuously provided via a hinge. Protruding and said
Arrow-shaped hooks are inserted into hook holes formed in adjacent side plates.
A foldable box made of synthetic resin, which is inserted from the inside and assembled into a square shape. 2. An upper end of a side plate formed by connecting the bottom plate.
The cover plate is provided continuously through a flange.
4. A foldable box made of a synthetic resin as described in 1. 3. A side plate formed by connecting said bottom plate.
Features a lid plate connected to one upper end via a hinge
The foldable box made of a synthetic resin according to claim 1 . 4. A fitting groove is provided on an inner surface of the lid plate, and the lid plate is
At the upper end of the side plate that is not connected continuously
A projection is projected, and the cover plate is closed by the fitting groove and the engagement projection.
The foldable box made of a synthetic resin according to any one of claims 1 to 3, wherein the box is closed .