JP2902982B2 - Synthetic resin box for heavy goods packing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box made of synthetic resin for packing canned beverages, juices, beers and the like.
More specifically, the present invention relates to a heavy-duty packing synthetic resin box having four side plates and a lid plate.

[0002]

2. Description of the Related Art Conventionally, a cardboard box is generally used as a container for packing canned containers of soft drinks, juices, beers and the like. The cardboard box is unfolded in a horizontal state before assembling and, for example, can be assembled into a box while being packed in an automatic packing line of a beverage company, so that transport and storage efficiency is high. Further, there is an advantage that the cardboard box can be put into an unfolded state even when returned in an empty box state where cans are taken out in route sales, so that it is easy to handle. However, cardboard boxes are 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 in this respect, cardboard boxes have been reviewed. 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, a synthetic resin box which is not folded up when not in use is disclosed in, for example, JP-A-6-13.
There is a box described in JP-A-5434 (hereinafter referred to as known example 1), a box described in JP-A-6-32346 (hereinafter referred to as known example 2), and a box described in JP-A-63-162458 (hereinafter referred to as known example 3). There is a box described. Known example 1
This box is formed by forming the body of the box with side plates, sticking two of the four folded pieces forming the bottom face at the diagonal part, and attaching it at the other diagonal part in a free state without sticking. When folded, it is a foldable box in which a diagonal portion in a free state is pressed in the circumferential direction and deformed into a rhombus shape so that four folded pieces are folded inside the side plate. However, the lid plate is not provided continuously. Further, the box of the known example 2 is a foldable box having the same structure as that of the known example 1 and has a lid plate connected thereto. The lid plate has a structure in which the flap for insertion at the tip portion is simply inserted and mounted. Things. Further, the box of the known example 3 has a square bottom plate, a side plate, and a lid plate which are formed by foaming and are connected to each other via a hinge, so that the box can be easily assembled from the expanded state and can be easily expanded. It is a box that can be assembled freely.

[0004]

The foldable box of the above-mentioned known example 1 is made of paper and has no cover plate, so that it cannot be packed by the box alone. Further, the collapsible box of the known example 2 has a problem that it is disengaged by a slight force because the flap for insertion at the tip portion is simply inserted. In addition, a large box for packing heavy objects such as canned beverages must be formed with a thick plate, and in this case, none of the boxes can be folded horizontally around four side plates. There's a problem. On the other hand, the assemblable box of the publicly known example 3 is formed of a foamed thermoplastic resin in order to maintain good airtightness and improve cold insulation and heat insulation. Then, the lid is closed by fitting fitting protrusions provided at the distal end of each side plate into fitting grooves provided on the back surface of the cover plate. Therefore, it is not possible to reliably hold the closed state as a box for packing heavy objects such as canned beverages and slanting or horizontally stacking them during transportation. Also,
Since the lid is a single plate, there is a problem that it is not possible to take out the stored items unless the lid is completely opened.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and the structure of the lid is easy to attach and detach, but when the lid is closed, it is firmly attached unless a force is applied to a specific portion. An object of the present invention is to provide a synthetic resin box for packing heavy objects.

[0006]

The present invention has the following configuration to achieve the above object. That is, the synthetic resin box for heavy goods packing according to claim 1 of the present invention has a lid plate connected to one of four side plates connected via a hinge via a hinge, and the lid plate is The lid plate is divided into two lid pieces by a slit orthogonal to a hinge for connecting the lid plate, and a fitting groove is formed on an outer peripheral edge which becomes an inner side surface when closed, and the lid plate is provided continuously. A fitting protruding piece that fits into the fitting groove is provided on a distal end surface of a side plate other than the side plate, and the fitting groove is
Form an engaging projection on the inner surface and cut off a corner on the inner surface
Forming an inclined surface, and the fitting projection has a side surface for the engagement.
Having an engaging piece formed with a horizontal concave groove for engaging the protrusion
In addition, a notch for inserting a finger between the lid and one or more side plates other than the side plate formed by connecting the lid plates is provided.
Kicking or either providing a notch to post the finger to the lid piece, or characterized by being bored hole to insert his finger into the lid piece.

According to a second aspect of the present invention, there is provided a box made of synthetic resin for heavy goods packaging, wherein the side plates are in the same direction via a hinge.
At the opposite corners when assembled in a box
The hinge is a double hinge, and the double hinge is a side plate.
Hinge is formed on both sides of the thin part formed thinner than
It is characterized by having done. The packing for heavy goods according to claim 3.
In the box made of synthetic resin, the side plates are hinged to the four sides of the bottom plate.
The lid is connected to one of the side plates via a hinge.
It is characterized by having been established. In addition, the heavy object according to claim 4
The packing synthetic resin box has a side plate formed by connecting the lid plate.
Notch for inserting finger between lid plate and tip of opposite side plate
A part is provided.

[0008]

Therefore, according to the first aspect of the present invention, the fitting protrusion is fitted into the fitting groove and is firmly mounted by simply pressing the lid plate, and each side plate is moved inward or outward. To prevent falling. The cutouts and the through holes in the lid plate serve as insertion holes for the hands when opening the lid plate. Further, since the lid plate is divided into two lid pieces, only one lid piece can be opened and closed. Fitting
An engaging projection formed on the outer inner surface of the mating groove forms a fitting projection.
By engaging the concave groove formed on the side of the engaging piece formed
Therefore, the fitting and the holding can be surely performed. Also, in claim 2
A double hinge in the set of diagonal portions, since the flaps of constant width, in the universal box folding the four folding piece forming the bottom so as to fold inward the side plate, the side plate horizontally Can be folded.

According to the third aspect of the present invention, it is possible to develop the apparatus into a single plate-like body, and it is possible to easily maintain a robust assembly state only by raising the four side plates.
According to the fourth aspect , the cover plate is accommodated by the notch provided at the end of the side plate facing the side plate formed by connecting the cover plate.
Can be easily launched .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description will be given based on the illustrated embodiment. FIG. 1 is a plan view of a foldable box in an unfolded state before assembly. The foldable box 1 includes a long side plate 3, a short side plate 7, a sticking piece 10 connected to the side plate 3, and a lid plate 11 connected to the side plate 3 and a folded piece. 13, a folding piece 17 connected to the side plate 5 and folding pieces 19 and 20 connected to the side plates 7 and 9 on the short side. The side plate 3 on the long side and the side plate 7 on the short side, and the side plate 5 on the long side and the side plate 9 on the short side are connected to each other via a double hinge 21. The side plate 5 on the side and the side plate 7 on the short side, and the side plate 3 on the long side and the sticking piece 10 are connected to each other via a hinge 23. Then, in order to have sufficient strength and prevent deformation, the side plates 3, 5, 7, 9 and the folded pieces 13, 17, 19, 2 are inserted.
The cover 0 and the cover plate 11 are each formed of a synthetic resin plate having a thickness of 3 to 6 mm, preferably about 5 mm. The resin used is preferably polypropylene in consideration of moldability and fatigue resistance of the hinges 21 and 23, but may be a resin such as polyethylene or polyvinyl chloride.

Although the hinge 23 has a known shape, even if the double hinge 21 is a folded plate having a large thickness, the double hinge 21 is arranged so that the upper and lower side plates become parallel when folded.
Hinges 27 and 29 are formed on both sides of the thin portion 25 having a predetermined width (see FIGS. 2 and 3). The width dimension of the thin portion 25 is appropriately determined by the thickness of the folded pieces 13, 17, 19, 20. The hinges 27 and 29 are formed with different thicknesses and widths. For example, the hinge 27 adjacent to the short side side plate 7 has a greater thickness than the hinge 29 adjacent to the long side side plate 3. It is thin and has a large width. Therefore, the thickness of the hinge 27 is defined as t1,
When the thickness of the hinge 27 is t2, t1 <t2, and the width of the hinge 27 is W1 and the width of the hinge 29 is W2.
> W2.

By forming the double hinge 21 having the above-described shape, when assembled into a box, the side plate 3 and the side plate 7 are first bent at the hinge 27, and the side plate 3 and the side plate 7 are bent at the hinge 29 when folded.
And the side plate 7 overlap in parallel. This thin part 2
The folding margin is adjusted by the width dimension of the hinge 5 and the hinges 27 and 29 (see FIG. 3). Incidentally, if the double hinge 21 is configured to be sequentially bent in the bending direction, the hinge 27,
The shape of 29 is not limited to the above embodiment.

Next, the cover plate 11 connected to the side plate 3 will be described. The lid plate 11 is continuously provided via a hinge 32, and the lid piece 11a and the lid piece 11b are formed at a substantially central portion by a slit (cut) 33 orthogonal to the hinge 32.
Is divided into two. Therefore, the lid 11a and the lid 11b can be opened and closed independently. 2 which becomes the inner surface when the lid piece 11a and the lid piece 11b are closed
A fitting groove 37 is formed at the outer peripheral edge of the side. As shown in FIGS. 4 and 6, the fitting groove 37 is a continuous groove having both ends opened, and has an engagement protruding portion 39 on the outer surface and an inclined surface 40 with a corner cut off on the inner surface. Each is formed.

On the other hand, fitting protrusions 41 are provided so as to fit into the fitting grooves 37 at the distal end surfaces of the side plates 5, 7, and 9. The fitting protrusion 41 is divided into an engagement piece 43 and a fitting piece 45 by a slit 47 provided at the center. The engagement piece 43 is located on the outer surface side when assembled, and has a groove 4 on the side surface.
9 are formed. An inclined surface 5 is provided on the outer surface of the fitting piece 45 to facilitate fitting of the lid piece 11a and the lid piece 11b.
0 is formed. Then, the lid piece 11a, the lid piece 11b
When the opening is opened while rotating, the fitting groove 37 and the fitting protrusion 4
In order to easily release the fitting state of 1 and facilitate startup, the fitting force of the mating portion of the lid piece 11a and the lid piece 11b forming a finger hole with a notch of a side plate described later is weakened. Preferably. In order to weaken the fitting force, the amount of protrusion of the engaging projection 39 in the fitting groove 37 may be reduced, or the amount of depression of the concave groove 49 on the side surface of the engaging piece 43 may be reduced, or both may be reduced. Good. As described above, even if the fitting force is weakened on the mating side of the lid piece 11a and the lid piece 11b, only a small portion is sufficient, so that the overall fitting force is not affected.

As shown in FIG. 6, the lid 11a and the lid 11
b is closed, the fitting groove 3
7 guides the fitting protrusion 41 into the fitting groove 37 while abutting on the inclined surface 40. At the same time that the fitting projection 41 fits into the fitting groove 37, the projection 39 engages with the concave groove 49 and is securely mounted. Since the slit 47 is provided on the back surface of the engagement piece 43, the engagement piece 43 has a slight elasticity, facilitates the fitting into the fitting groove 37, and changes the engagement state after the fitting. It can be securely held. On the other hand, when the fitting force of the mating portion of the lid piece 11a and the lid piece 11b forming the finger hole with the notch of the side plate is weakened, the fitting protrusion 41 is removed from the fitting groove 37 with a slight force. Can be withdrawn. When a part is pulled out, the fitted state is released sequentially, and the lid piece 11 is released.
a, The lid piece 11b can be easily opened. Further, when the engaging projection 41 is fitted in the fitting groove 37, the outer peripheral surface of the cover plate 11 and the outer surfaces of the side plates 5, 7, 9 are substantially flush with each other.

FIG. 7 is a sectional view showing another embodiment in which the cover plate 11 is mounted on the side plates 5, 7, and 9, in which the fitting groove 38 and the fitting protrusion 42 are fitted. The fitting groove 38 has substantially the same shape as the fitting groove 37 of the above embodiment, and has an engaging projection 44 on the outer surface and an inclined surface 46 with a corner cut off on the inner surface. On the other hand, the fitting projection 42 is a single body protruding from the tip end surfaces of the side plates 5, 7, 9 and has a concave groove 52 formed on the outer surface. A cover piece 1 is provided at an inner corner of the engagement protrusion 42.
1a, inclined surface 5 to facilitate engagement with lid piece 11b
4 are formed. As described above, when the fitting protrusion 42 is formed as a single body, it can be firmly fitted and does not come off accidentally. Incidentally, also in this embodiment, the lid 1
In order to facilitate the first rising on the mating side (slit 33 side) of the lid 1a and the lid piece 11b, the projecting amount of the engaging projection 44 in the fitting groove 38 is reduced, or It is preferable that the fitting force is reduced by reducing the amount of depression of the concave groove 52 of 42 or by reducing both.

Next, an outer corner portion of the tip of the cover plate 11 (cover piece 1)
As shown in FIG. 8, FIG. 9, and FIG. 12, the upper surface corner is cut off at the portion where the lid 1a and the lid piece 11b form corners of the box, as shown in FIGS. That is, in FIG. 8, the upper surface angle of the lid piece 11a is cut off obliquely to form the triangular cut surface 51. In FIG. 9, the L-shaped cut surface 53 is formed by cutting the upper surface obliquely along the edge. By cutting off the corners of the upper surface in this way, corners that are likely to collide can be eliminated, so that it is possible to prevent the corners from being damaged due to the collision and the lid pieces 11a and 11b from being carelessly opened.

A notch 55 is provided at the approximate center of the end of the side plate 5 on the long side. When the cover piece 11a and the cover piece 11b are closed, as shown in FIG. 11, the notch 55 forms a finger hole 56 for inserting a finger between the notch 55 and the cover piece. By inserting a finger into the finger hole 56, the lid 11a and the lid 11b can be easily raised. The position where the notch 55 is provided is not limited to the substantially central portion of the tip of the side plate 5 but may be provided at both ends of the side plate 5. Further, the cutout portion 55 can be provided at the tip of the side plates 7 and 9 instead of the side plate 5. Further, as described above, a notch may be provided at the end of the side plate to form a finger hole 56 between the side plate and the lid, but as shown by a dashed line in FIG. 1, the lid 11a and the lid 11b are formed. The finger hole 58 may be formed directly in the vicinity of the slit 33. Thus, even when the finger hole 58 is directly formed in the lid piece, the lid piece 11a
It is preferable to weaken the fitting force on the mating side (slit 33 side) of the cover piece 11b and the cover piece 11b.

Next, the folded pieces 13 to 20 connected to the side plates 3 to 9 will be described with reference to FIGS. The folded pieces 13 and 17 have the same shape, have a concave portion 57 at the tip, and are connected to the side plates 3 and 5 via a hinge 59. The elbow 60 is formed from the corner of the recess 57 toward the end on the side plate side.
Then, the triangular portion 61 outside the hinge 60 becomes a piece to be attached to the folded pieces 19 and 20 or a heat-welded piece. When assembled, the folded piece 13 and the folded piece 17 intersect at the concave portion 57, and the triangular portion 61 and the protruding portion 63 on the opposite side overlap each other. Also, the folding pieces 19, 2
Numeral 0 is formed in the same trapezoidal shape and is connected to the side plates 7 and 9 via the hinge 65. And, it is formed larger than the triangular portion 61 and formed so as to protrude from the hinge 60 when assembled. When assembling, the folded pieces 19 and 20 are fixed to the inside of the triangular portion 61 by sticking or heat welding, and assembled such that the triangular portion 61 is outside at the bottom. Folding piece 1
By forming the components 9 and 20 so as to protrude from the hinge 60, the assembly is placed on the hinge 60 when assembled, so that the hinge 60 is protected and the hinge 60 is broken by the load of the stored items. To prevent

Furthermore, the folded pieces 13 to 20 have a folded thickness when assembled that is substantially the same as the plate thickness of the folded pieces, and the overall folded thickness when folded is equal to the thickness of the two folded pieces. They are formed to be almost the same. Referring to FIG. 10, when assembled,
The overlapped portions 67 and 69 where the folded pieces 13 and 17 intersect and overlap each other (shaded portions) are about 2
It is formed with a thickness of 1 /. On the other hand, when folded, the folding pieces 19 and 20 and these and the folding pieces 13 and
17 overlapping portions (portions indicated by vertical lines) 70, 71
In this case, the thickness is reduced to about one-third because the thickness is tripled. In this way, by adjusting the thickness of the overlapping portion, even if the synthetic resin plate has a thickness of 3 to 6 mm, a flat surface can be obtained without a step on the bottom surface when assembled. Also, when folded, the whole can be formed into a smooth plate-like body. The sticking pieces 10 and the end portions 72 of the side plates 9 to which the sticking pieces 10 are stuck are also formed to have a thickness of about half the plate thickness.

Next, the folding piece 13 and the folding piece 17
Is assembled by tilting the inclined surfaces 73 of the overlapped portion 67 partially and tilting the contact points so that the contact points rotate so that the two folded pieces are tilted to each other, or the two folded pieces stand up while the contact points are shifted. Is folded by Therefore, in order to assemble a folded piece having a large plate thickness and to smoothly perform folding, it is desirable to remove a corner portion of the inclined surface 73.

Next, a case where the box is assembled from the unfolded state shown in FIG. 1 will be described. First, it is bent from the double hinge 21 and the sticking piece 10 is fixed to the end 72 of the side plate 9 to form a trunk. Next, the folding piece 19 is replaced with the folding piece 13.
The folding piece 20 is fixed to the inside of the triangular portion 61 of the folding piece 17 by sticking or heat welding, respectively. At this time, the folded piece 13 and the folded piece 17 intersect at the concave portion 57, and a free end that is not stuck to the inside of the box, that is, the folded piece 19,
Assemble so as to overlap with the upper surface of 20. Next, the folding piece 13 and the folding piece 17 are arranged such that the overlapping portion 67 of the folding piece 13 overlaps with the overlapping portion 69 of the folding piece 17, while the overlapping portion 67 of the folding piece 17 overlaps the overlapping portion 69 of the folding piece 13. Assemble to Therefore, in the overlapped portion, the entire thickness becomes substantially the same as the plate thickness, and the folded piece 13
And the folding piece 17 is in a substantially horizontal state.

That is, the folding piece 19 is sandwiched between the triangular portion 61 of the folding piece 13 and the overlapping portion 70 of the folding piece 17, and the overlapping portion 69 of the folding piece 13 and the folding piece 17
Overlap with the polymerized portion 67. Therefore, the overlapping portions of the folding pieces 17 overlap with each other in a substantially horizontal state. As described above, since the thickness of the overlapping portion of each folded piece is adjusted, the bottom surface can be assembled in a horizontal state.

When closing the lid piece 11a and the lid piece 11b, the side plate 7,
What is necessary is just to press the fitting protrusion 41 at the 9 tip and further press the fitting protrusion 41 of the side plate 5 to fit the fitting groove 37. The fitting protruding pieces 41 are pushed into the fitting grooves 37 while the lid pieces 11a and 11b are falling down, and are sequentially fitted. Lid piece 1
When the lid 1a and the lid 11b are completely closed, a finger hole 56 is formed between the side plate 5 and the notch 55 (see FIG. 12). On the other hand, when opening the lid pieces 11a and 11b,
If you insert your hand into the finger hole 56 and pull it up,
7 and the fitting projection 41 are first released from the fitting side (slit 33 side) of the lid 11a and the lid 11b on the mating side (slit 33 side).
The fitting projections 41 are sequentially released (see FIG. 11). Lid plate 1
1 is a slit 33 for the lid 11a and the lid 11b.
Since it is divided into two, opening and closing operations are easy, and only one lid piece can be opened and closed.

Next, the case of folding will be described.
First, when the lid pieces 11a and 11b are opened, 4
Of the folded pieces, two overlapping at the diagonal are fixed and the other diagonal is free from sticking, so pressing the diagonal corner inward in the circumferential direction makes a diamond shape , And at the same time, are folded from the hinge 60, and the four folded pieces are folded while gradually rising inward. The folded piece 13 and the folded piece 17 face each other and overlap with each other, and at the corner where the folded pieces 19 and 20 are fixed, the folded pieces 19 and 20 are folded together with the folded pieces 13 and 17 and the triangular portion 61 respectively. , And can be folded into a flat plate state with the ridge line at a right angle. Therefore, since it is folded into a plate shape, it is not bulky and takes up little space when storing and transporting.

The synthetic resin box according to the above embodiment relates to a box whose side plate can be folded into a rhombus shape. FIG. 13 shows a box that can be assembled into a single plate when unfolded. This is an application example of the foldable box shown in FIG. Therefore, the same components as those of the embodiment shown in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and only different components are denoted by different reference numerals and described. The assembling box 99 has side plates 101 and 103 attached to hinges 105 and 107 on two opposite sides of a rectangular bottom plate 100, respectively.
The side plate 103 is further provided with a lid plate 1.
09 are connected via a hinge 110. Lid plate 10
Reference numeral 9 designates a cover piece 109a and a cover piece 109 by a slit (notch) 111 orthogonal to the hinge 110 at a substantially central portion.
b. Therefore, the lid piece 109a
And the lid piece 109b can be independently opened and closed.

A fitting groove 37 is formed at the outer peripheral edges of two sides which become inner side surfaces when the cover pieces 109a and 109b are closed. A fitting groove 37 is formed at a side edge of the side plate 103, and a fitting protrusion 4 is formed at an outer peripheral end surface of the side plate 101.
1 is protruded. The lid plate 109 is the bottom plate 100
A notch 113 is provided substantially at the center of the front end of the side plate 103 on the opposite side with respect to. The notch 113 is a cover piece 1
When the cover 09a and the cover 109b are closed, a finger hole for inserting a finger between the cover 09 and the cover is formed. The notch 11
3, the notch 115 is provided on the mating side (slit 33 side) as shown by a dashed line in the lid pieces 109a and 109b.
May be provided. Also, as shown in the finger hole 58 of FIG.
A through hole may be directly formed in the cover piece 109a and the cover piece 109b.

To assemble the assembling box, first,
The side plate 101 is erected at right angles to the bottom plate 100, and then the side plate 103 is erected. What is necessary is just to fit the fitting protrusions 41 on both sides of the side plate 101 into the fitting groove 37 while erecting the side plate 103 and assemble. As described above, in the case of this embodiment, two side plates adjacent to each other can be connected to the assembled state with one touch only by erecting the side plates. Subsequently, after storing the stored items, the lid pieces 109a and 109b may be pressed against the fitting projections 41 at the distal ends of the side plates 101 and 103 while being bent and rotated from the hinge 110. The fitting projections 41 are pushed into the fitting grooves 37 while the lid pieces 109a and 109b are tilted inward, and are sequentially fitted.
When the lid pieces 109a and 109b are completely closed, they are assembled into a hexahedral box. On the other hand, lid pieces 109a, 109b
Can be opened by inserting a hand into the through hole formed by the notch 113 and pulling it up.

Also in the assembling box of this embodiment, a smooth surface can be obtained without projections on the outer peripheral surface and the corners, and a smooth plate-like body can be obtained when the assembly state is released and deployed. Therefore, storage and transportation can be performed efficiently without taking up space. In order to prevent a collision, a triangular cut surface 5
1. Of course, an L-shaped cut surface 53 can be provided.

[0030]

In the case of the synthetic resin box according to the first aspect of the present invention, the lid plate can be closed only by rotating and pressing about the hinge, and when it is clear, it is only necessary to raise the tip. The lid can be easily opened and closed. Since the lid plate is divided into two lid pieces by a slit orthogonal to the hinge that connects the lid plate, the lid plate can be opened and closed in the same direction, and only one lid piece can be opened and closed. In addition, since the fitting groove of the cover plate and the fitting protruding piece on the end face of the side plate are fitted, the fitting can be performed with one touch, and the structure is simple and excellent in durability. In addition, since the fitting groove of the cover plate is formed on the inner surface, and the fitting protrusion is formed on the tip end surface of the other opposing side plate, the outer peripheral surfaces of the cover plate and the side plate become substantially the same surface and there is no unevenness The collision of the cover plate can be prevented. Further, it can be easily opened by inserting a hand into a cutout provided in the side plate or the cover piece or a through hole formed in the cover piece.

Further, an engaging projection is formed on the outer inner surface of the fitting groove provided on the outer peripheral edge of the cover plate, and the fitting projection on the tip end surface of the side plate is formed.
Forms a horizontal groove on the outer surface for engaging the engaging projection.
Since the engaging piece is formed, it can be easily fitted and mounted. On the other hand, in the closed state, it is firmly fitted and cannot be easily removed unless a force is applied to a specific portion. Further, in the synthetic resin box for heavy goods packaging according to claim 2 , since the hinges at one pair of diagonal portions are double hinges, the foldable box that forms the bottom portion is folded inside the side plate, The side plate can be folded horizontally. Further, in the synthetic resin box for packing heavy goods according to claim 3 , the side plates are connected in a cross shape to the four sides of the bottom plate via hinges, and the lid plate is connected to one of the side plates via the hinges. Therefore, it is possible to assemble the unfolded state only by erecting the side plate, and when unfolded, it is possible to form a single plate. Further, in the heavy-duty packing synthetic resin box according to the fourth aspect , since the notch is provided at the end of the side plate facing the side plate formed by connecting the cover plate, the fitting groove and the fitting protrusion are fitted. The state can be released and opened easily.

[Brief description of the drawings]

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

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

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

FIG. 4 is a sectional view of a fitting groove provided in a cover plate.

FIG. 5 is a sectional view of a fitting projection provided on a side plate.

FIG. 6 is a cross-sectional view of a state in which a fitting protrusion is fitted in the fitting groove.

FIG. 7 is a cross-sectional view of a fitting state of a fitting groove and a fitting protrusion according to another embodiment.

FIG. 8 is a perspective view of a main part showing a cut state of a corner of the upper surface of the cover plate.

FIG. 9 is a perspective view of a main part showing another cut state of the upper corner portion of the lid plate.

FIG. 10 is an explanatory partial perspective view showing a shape of a thickness of a folding piece.

FIG. 11 is a top perspective view showing the essential view with the cover plate opened.

FIG. 12 is a top perspective view showing a state where a cover plate is closed.

FIG. 13 is a plan view showing an unfolded state of an assembly box in another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box 3 Long-side side plate 5 Long-side side plate 7 Short-side side plate 9 Short-side side plate 10 Adhesion piece 11 Cover plate 11a Cover piece 11b Cover piece 13 Fold piece 17 Fold piece 19 Fold piece 20 Fold Piece 21 double hinge 23 hinge 25 thin portion 27 hinge 29 hinge 30 notch for through hole 32 hinge 33 slit 37 fitting groove 38 fitting groove 39 engaging projection 40 inclined surface 41 fitting projection 42 fitting projection 43 engaging piece 44 engaging projection 45 fitting piece 46 inclined surface 47 slit 48 engaging piece 49 concave groove 50 inclined surface 51 triangular cut surface 52 concave groove 53 triangular cut surface 54 inclined surface 55 engagement protrusion 56 finger hole 58 through hole for finger hook 100 bottom plate 101 side plate 103 side plate 105 hinge 107 hinge 108 cover plate 109 cover plate 110 hinge 111 slit 13 cut-out portion 115 cut-out portion

Continuation of the front page (72) Inventor Atsushi Ushio 1 Nobesawa, Kaisei-cho, Ashigara-gun, Kanagawa Prefecture Inside the Meiji Rubber Chemical Kanagawa Plant (56) References JP-A-63-162458 (JP, A) 17930 (JP, U) Japanese Utility Model Hei 6-78229 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 6/18 B65D 5/54

Claims (4)

(57) [Claims] 1. One of four side plates continuously provided via a hinge.
And a lid plate is connected via a hinge, and the lid plate is divided into two lid pieces by a slit orthogonal to the hinge connecting the lid plate, and an outer peripheral edge which becomes an inner surface when closed. A fitting groove is formed in the fitting plate, and a fitting protruding piece that fits into the fitting groove is not provided on a distal end surface of a side plate other than the side plate formed by connecting the lid plate.
The fitting groove forms an engaging projection on the outer inner surface,
An inclined surface with a corner cut off is formed on the inner surface, and the fitting protrusion is formed.
The piece has a horizontal concave groove on the side that engages the engaging projection.
And a finger between the lid and one or more side plates other than the side plate formed by connecting the lid plate.
Provide a notch for insertion, or insert a finger into the lid
Notch or insert a finger into the lid
A synthetic resin box for packing heavy goods, characterized in that a through hole is formed therein. 2. The side plate is connected in the same direction via a hinge, and when assembled into a box, a hinge at one set of diagonal portions is a double hinge, and the double hinge has a thickness of the side plate.
The synthetic resin box for packing heavy goods according to claim 1 , wherein hinges are formed on both sides of the thin portion formed thinner . 3. The side plate according to claim 1, wherein four sides of the bottom plate are connected in a cross shape via a hinge, and a lid plate is connected to one of the side plates via a hinge. 2. A box made of a synthetic resin for packing heavy goods according to 2. Wherein any one of claims 1 to 3, characterized in that a notch insert his fingers between the cover plate to the front end of the side plate opposite the side plate formed by continuously provided the cover plate The synthetic resin box for packing heavy goods according to claim 1.