JP5869837B2 - Folding storage box - Google Patents

Description

  The present invention relates to an improvement of a foldable storage box made of a synthetic resin hollow body sheet in which a first side wall having an inner folding hinge and a second side wall in which a bottom plate is foldably connected are flexibly connected.

Conventionally, as a collapsible container in which side walls extending opposite to each other in one direction are folded inward at the center, for example, in Japanese Patent Application Laid-Open No. 6-321233, a hinge at a central portion is used in a vertical direction. A first side wall that can be bent inward in the extending linear direction, and a cross-section that is bent inward at both ends, has a U-shaped cross section, and has a bottom that is integrally coupled to the three sides of the lower end. The two side walls of the two side walls are alternately connected to each other, and further, the trapezoidal portion includes two trapezoidal bottom plates each having one trapezoidal portion and a triangular portion on both sides thereof connected to each other by a folding line. The bottom plate of the side wall of the second side wall and the triangular portion are foldably connected to each other at the lower end of the first side wall to form a bottom plate integrally, and the first and first side plates are in contact with each other. The box body is composed of the two side walls and the bottom plate, Serial reinforcing bottom plate provided with the attached side foldably to the lower portion of the second side wall, is known arrangement forming the absorber.
However, in the above configuration, since the pair of first side walls have a central hinge that bends inward of the container, a strong force is exerted inward from the outside on the first side wall that is flattened during assembly. If there is a possibility, the hinge at the center may be bent inward, so that the two parts that touch each other on one side are composed of a trapezoidal part and a triangular part that connects the hypotenuse of the trapezoidal part respectively. These bottom plates need to be configured to bend from the lower end of the side wall and the connecting portion of the trapezoidal portion and the triangular portion, and be folded inward, and there is a problem that the structure becomes complicated.
Japanese Patent Laid-Open No. 7-309338 includes a second side wall of the container when the container is folded by providing a central hinge that is bent inward on the first side wall having a U-shaped cross section. The total length in the horizontal direction is smaller than the total length in the horizontal direction including the second side wall of the container when the container is assembled.
In this case, since the central hinges formed on the opposing first side walls are aligned on the same plane, the protrusions of the first side wall are brought into contact with both side ends of the bottom wall and latched. Since the bottom wall is divided into two parts and foldably connected to the first side wall, it is necessary to lock the bottom wall at the center of the bottom surface, which complicates the structure and can be latched when a large force is applied from the outside. There is a problem that the assembly posture is lost.

JP-A-6-321233 JP 7-309338 A

In order to solve the above-mentioned problems, the present invention has an assembly posture by covering the inward hinge position with the long support plate and the short support plate with respect to the inward hinges aligned on the same plane at the first opposing side walls. An object of the present invention is to provide a foldable storage box having excellent stability for holding.
Another object of the present invention is to provide a foldable storage box capable of increasing the strength of a bottom plate by supporting a horizontally deployed bottom plate from below with an auxiliary bottom wall during assembly.
Further, the second side wall is formed by the second side wall body and the second reinforcing side wall part, and the bottom plate is connected to the lower side of the second reinforcing side wall part, so that the foldable storage with a double structure and excellent strength is achieved. Box can be provided.
Furthermore, the foldable storage box which can block | close the upper opening of a box can be provided by connecting an upper cover piece above the 2nd reinforcement side wall part.
Further, if a fitting protrusion is provided on the lower surface of the auxiliary bottom wall, a stackable folding storage box can be provided.

In order to solve the above-mentioned problems, the present invention provides
The folding cross section of the folding storage box at the time of unfolding consists of a square cross section,
A pair of first side walls provided facing either the vertical or horizontal direction of the cross-sectional square, a second side wall provided facing either the vertical or horizontal direction, and a first side wall near the corner portion. A corner hinge provided on one side wall and extending in a height direction to bendably connect the first side wall and the second side wall; and a lower end of the second side wall connected to be bent via a lower hinge. A hollow box made of a synthetic resin having a bottom plate, and the first side wall has an inner folding hinge extending in the height direction at the center, and the first side wall is formed through the inner folding hinge and the corner hinge. In the folding storage box composed of a synthetic resin hollow body sheet having a first side wall body that can be folded inward of the box,
A longitudinal support plate that is fixed to each first side wall so as to overlap the inside of the first side wall main body and extends from one side to the midway position beyond the inner folding hinge at a location that does not overlap the pair of corner hinges, A short support plate extending to a position aligned with the end of the long support plate when the box is assembled without exceeding the folding hinge;
The lower portions of the long support plate and the short support plate are held in the same plane in abutment with the side end surface of the bottom plate that is horizontally deployed.
In the invention of claim 2,
Each of the pair of second side walls includes a second side wall body and a second reinforcing side wall portion fixed along the inside of the second side wall body,
Below the second reinforcement aids sidewall portion and consecutively provided a bottom plate capable folded over the lower hinge extending horizontally,
The second side wall main body is formed so as to be foldable or unfoldable integrally with a continuous piece extending from a corner portion at both ends to a corner hinge of the adjacent first side wall main body.
In the invention of claim 3,
The second side wall main body integrally has an auxiliary bottom wall that closes a rectangular region surrounded by the lower end of the second side wall main body and the lower end of the adjacent connecting piece,
The auxiliary bottom wall is arranged at a position where it comes into contact with the back surface of the bottom plate when the bottom plate is deployed substantially horizontally.
In the invention of claim 4,
An upper lid piece for closing the upper opening of the box at the time of assembly is connected to the second reinforcing side wall portion so as to be foldable via a horizontally extending second upper hinge.
In the invention of claim 5,
The bottom plate is a single bottom plate that is foldably connected below one of the second reinforcing side walls, or a pair of bottom plate components that are foldably connected below the pair of second reinforcing side walls. It is characterized by comprising.
In the invention of claim 6,
On the lower surface of the auxiliary bottom wall, there is formed a fitting protrusion that can be fitted to the inner peripheral surface of the upper end of the second side wall of another foldable storage box disposed below, and the foldable storage box It is characterized by being stackable up and down.
In the invention of claim 7,
The longitudinal support plate and the short support plate provided on the opposing first side walls are arranged in opposite directions.

In the present invention, the following specific effects can be obtained.
(1) A longitudinal support plate and a short support plate are provided inside the pair of first side walls and abutted with the side edges of the bottom plate, thereby increasing the strength of the first side wall as a double structure and opposing the first side walls. Since the folding line of the inner folding hinge formed in the center of the side wall and the separation line of the long support plate and the short support plate are different, the load applied to the folding curve can be dispersed, and the strength and stability Can be improved. Furthermore, since the folding line of the inner folding hinge extends in the height direction, the inner folding hinge is not bent and is resistant to pressing from above.
(2) The second side wall includes a second side wall main body and a second reinforcing side wall, and the first side wall main body is connected to the second side wall main body via a corner hinge, and is connected to the second reinforcing side wall. Since the bottom plate is connected, the bottom plate can be accommodated in a space surrounded by the second side wall main body and the connecting pieces of the first side wall main body formed on both sides thereof when folded.
(3) Since the auxiliary bottom wall is provided at the lower end of the second side wall main body, the back surface of the bottom plate developed substantially horizontally can be supported from below by the auxiliary bottom wall, so that the load resistance can be increased.
(4) By connecting the upper lid piece to the second reinforcing side wall portion so as to be foldable, the upper opening of the assembled box can be covered and covered with the upper lid piece.
The upper lid piece is formed by an upper lid support piece connected to the long support plate and the short support plate.
Since the back surface of the upper lid piece is supported from below by the upper lid support piece portion, the posture of the upper lid piece does not collapse.
(5) The load can be distributed by dividing the upper lid piece into a pair of upper lid constituting pieces and dividing the upper lid supporting piece into upper lid supporting constituting pieces.
(6) An insertion piece is provided at the tip of the upper lid component piece, and a gap for inserting the insertion piece is provided between the pair of upper lid support component pieces so that the horizontal posture is maintained when the upper lid component piece is deployed. The lid will not open carelessly.
(7) The gap for inserting the insertion piece can be easily formed by cutting out one of the upper lid support component pieces.
(8) The bottom plate may be a single piece or a bottom plate component piece, and can be appropriately formed according to the size, shape, and use of the folding storage box.
(9) Since the projection surface for fitting is provided on the lower surface of the auxiliary bottom wall, when the assembled folding storage box is stacked up and down, the projection surface for fitting of the upper folding storage box is folded to the lower level. Since it is fitted and locked to the upper opening of the storage box, it can be easily stacked.
(10) The developed bottom plate can be supported by forming a lower bent portion at the lower end of at least one of the long support plate or the short support plate.

It is a perspective view which shows the assembly (development) state of the foldable storage box of Example 1. FIG. It is the center longitudinal cross-sectional view which made the 1st side wall the front side. It is a top view which shows the assembly state of a foldable storage box. The folding state of a folding storage box is shown, (a) is a top view, (b) is a bottom view. It is the perspective view which looked at the state in the middle of folding and an assembly from the bottom. It is the perspective view seen from the bottom which shows the assembly state before the expansion | deployment of the baseplate of a foldable storage box. It is the perspective view seen from the top which shows the assembly state before the expansion | deployment of the baseplate of a foldable storage box. It is a perspective view which shows the middle of expansion | deployment of the baseplate of a foldable storage box. It is sectional drawing which shows the foldable storage box of Example 2 by which the baseplate was divided into two. It is the figure which looked at Fig.8 (a) from the bottom. It is sectional drawing which shows the foldable storage box of Example 2 by which the baseplate was divided into two. It is sectional drawing which shows the foldable storage box of Example 3 in which a baseplate has a folding hinge in the middle position. It is a perspective view of the foldable storage box of Example 4 with the upper lid piece opened. It is a perspective view of the foldable storage box of Example 4 with the upper lid piece closed. It is sectional drawing of the foldable storage box of Example 4 of the state which opened the upper cover piece. It is sectional drawing of the foldable storage box of Example 4 of the state which closed the upper cover piece. It is sectional drawing of the folding storage box of Example 5 which provided the upper cover piece.

The first side wall is provided with a long support plate and a short support plate that are separated from the inner folding hinge, and the side end of the bottom plate that is deployed substantially horizontally during assembly is brought into contact with each other. Improved strength and stability of the storage box.
Hereinafter, a preferred embodiment of the folding storage box of the present invention will be described with reference to the drawings.

[Foldable storage box]
The unfolded assembled state of the foldable storage box 1 of this embodiment is shown in FIGS. 1 to 3, and the folded state is shown in FIG.
The folding storage box 1 is made of a plastic hollow body sheet.
Here, as the plastic hollow sheet, plastic corrugated cardboard that is discharged and molded as a single unit by one extrusion is used, but plastic corrugated cardboard having a core between two liners, and other A synthetic resin sheet that can be thermally bent, such as a hollow synthetic resin sheet, can be used.

The foldable storage box 1 includes a pair of first side walls 2 that extend along the short direction of a rectangular cross section and are provided facing each other, and a pair of second side walls 5 that extend along the longitudinal direction and are provided facing each other. A bottom plate 8 is provided at the lower end of the second side wall 5 so as to be bent via a lower hinge H3.
In the present invention, the cross-sectional shape of the foldable storage box 1 is not limited to a rectangle but may be a square, and the first side wall 2 and the second side wall 5 can be determined in any direction.

[Hinge]
At the center of the first side wall 2 of the foldable storage box 1, an inward folding hinge H1 is formed that extends in the height direction and bends in the valley folding direction when folded.
Further, in the vicinity of the four corners C of the foldable storage box 1, the first side wall 2 and the second side wall 5 are bent in the mountain fold direction when folded, and the corner hinge H2 extending in the height direction is bent. Is formed.
In the illustrated example, a pair of corner hinges H2 are provided at positions offset from a pair of corner portions C sandwiching the first side wall 2 from both sides toward the inward folding hinge H1 of the first side wall 2.
Further, a bottom plate 8 is connected to the lower portion of the second side wall 5 through a lower hinge H3 that extends in the horizontal direction and bends in the valley folding direction when folded.
In the present embodiment, each of the hinges H1 to H3 is composed of a groove having a V-shaped or U-shaped cross section formed by a heat ruled line.

[First side wall]
The first side wall 2 is fixed to a first side wall body 20 provided with the inner folding hinge H1 at the center and one first side wall body 21 divided by the inner folding hinge H1 and extends beyond the inner folding hinge H1. A short support plate 4 which is fixed to the support plate 3 and the other first side wall body 22 divided by the inner folding hinge H1 and has a tip which does not exceed the inner folding hinge H1 and is in contact with or close to the tip of the long support plate 3. It is made up of.

As described above, the first side wall main body 20 has a pair of corner hinges H2 that are formed in parallel with the corners C and extend in the vicinity of the corners C, and extend from the corner hinges H2 to the corners C. It has a U-shaped cross section provided with a continuous piece 6b and a sticking piece 6c that is bent at a right angle from the continuous piece 6b to form a corner portion C and is integrally fixed to both ends of the second side wall body 6. Yes.
The longitudinal support plate 3 is fixedly integrated from the base end to the portion corresponding to the inner folding hinge H1 along the inner wall surface of the first side wall main body 21, and the portion beyond the inner folding hinge H1 is any one of the portions beyond the inner folding hinge H1. 1 Side wall main bodies 21 and 22 are not fixed and are free.
The short support plate 4 is integrally attached to the inner wall surface of the other first side wall body 22 from the proximal end to the distal end.

When the folding storage box 1 is assembled, the tip of the long support plate 3 and the tip of the short support plate 4 come into contact with each other through the separation line L without any gap, and the inner surface of the first side wall body 20 is covered. It is designed to cover twice.
The long support plate 3 and the short support plate 4 provided on the pair of opposing first side walls 2 may be arranged symmetrically so as to face each other, but in the illustrated example, they are in opposite directions, that is, one of the first support plates 4. The short support plate 4 of the other first side wall 2 faces the long support plate 3 of the other first side wall 2 and the long support plate 4 of the other first side wall 2 faces the long support plate 4 of the other first side wall 2. Are arranged to be.

Accordingly, the separation line L between the distal ends of the long support plate 3 and the short support plate 4 formed on one first side wall 2 and the long support plate 3 and the short support plate 4 formed on the other first side wall 2. A separation line (referred to as L ′ for convenience of explanation) between the leading ends of the inner folding hinges H1 is disposed at a position shifted in a different direction from the surface connecting the opposing inner folding hinges H1.
As a result, even when the inner folding hinge H1 of the opposing first side wall main body 20 is in a position facing the center, the longitudinal support plate 3 overlaps the inner folding hinge H1 at the time of assembly, so that the first side wall at the time of assembly. The bending of the part corresponding to the inner folding hinge H1 of the main body 20 can be prevented.

[Second side wall]
In this embodiment, the second side wall 5 is a thin synthetic resin hollow body sheet that is fixed along the second side wall body 6 that extends linearly and the inner wall surface 6a of the second side wall body 6 and is thick. It consists of the 2nd reinforcement side wall part 7 formed with the resin-made hollow body sheet | seats.

And the lower hinge H3 extended horizontally along the lower part of the 2nd reinforcement side wall part 7 of one 2nd side wall 5 is formed, and the bottom plate 8 of the same thickness can be folded via this lower hinge H3. It is connected continuously.
In addition, an auxiliary bottom wall 11 is integrally formed at the lower end of the second side wall body 6 so as to block a rectangular area surrounded by the second side wall body 6 and the connecting piece 6b.

In this embodiment, the second side wall body 6 is formed as follows by combining a flat synthetic resin hollow body sheet with a flat synthetic resin hollow body sheet for forming the first side wall body 20.
First, the inner folding hinge H1 is formed by a heat ruled line at the center of a flat synthetic resin hollow body sheet (in the illustrated example, the flow line is horizontal) for forming the first side wall body 20, and a predetermined length is formed from both left and right ends thereof. A pair of left and right corner hinges H2 is provided in parallel with the inner folding hinge H1 at a position close to the center.

The outer part spaced apart from the corner hinge H2 by a predetermined length is the continuous piece 6b, the part that is bent and extended at right angles by hot bending or the like is the sticking piece 6c, and the corner is the corner part of the storage box. C.
The sticking piece 6c on the tip side from the corner portion C is compressed and fixed integrally with both ends of a flat synthetic resin hollow body sheet (the flow line is vertical in the illustrated example) forming the second side wall body 6. Thus, the continuous piece 6b is formed so as to be integrated with the second side wall body 6 when folded or unfolded.

Since the second side wall main body 6 is made of the flat synthetic resin hollow body sheet, the lower end of the second side wall main body 6 is bent inward at right angles by hot bending or the like, and the second side wall main body 6 and the connecting piece 6b. The auxiliary bottom wall 11 is formed by extending the corner hinge H2 in a rectangular shape so as not to hinder the bending of the corner hinge H2 in the region surrounded by the lower end of the auxiliary bottom wall 11.
The auxiliary bottom wall 11 preferably has a shape in which the tip is aligned with the auxiliary bottom wall 11 on the side of the second side wall body 6 facing when the storage box is folded. In this way, the shape is not particularly limited, and the length does not need to extend to the corner hinge H2.

A second reinforcing side wall portion 7 whose upper end is set lower than the upper end of the second side wall body 6 by a predetermined length is fixed to the inner wall surface 6 a of the second side wall body 6.
In this embodiment, the second reinforcing side wall portion 7 fixed to one second side wall body 6 is connected to the bottom plate 8, and one thick synthetic resin hollow body sheet (in the illustrated example, the flow line is Vertical).
That is, since the heat ruled line that traverses in the middle of the thick synthetic resin hollow body sheet is formed to form the lower hinge H3, the second side wall body 6 is formed with the upper side of the lower hinge H3 as one second reinforcing side wall 7. The bottom plate 8 is fixed to the inner wall of the wide surface 6a and is bent downward (see FIG. 2).

A second reinforcing side wall portion (referred to as 7 ′ for convenience of description) fixed to the other second side wall body 6 extends to the lower end of the second side wall body 6.
As a result, when the bottom plate 8 is tilted from the standing posture of FIG. 6B as shown in FIG. 7 and horizontally deployed (see FIG. 2), the lower surface of the bottom plate 8 is supported by the pair of auxiliary bottom walls 11. At the same time, the front end of the bottom plate 8 abuts against the lower portion of the second reinforcing side wall portion 7 ′ of the second side wall facing the bottom plate 8 and is pressed between them, so that the bottom plate 8 can be firmly assembled.

  In the folding storage box 1, the bottom plate 8 is pushed up from the opening between the auxiliary bottom walls 11 on the back surface, and is folded to an upright position overlapping the second reinforcing side wall portion 7 via the lower hinge H3. 5 and pushing the pair of inner folding hinges H1 into the box as shown in FIG. 5, the first side wall body folded in half, the pair of connecting pieces 6b and the second side wall body 6 In the formed space, the bottom reinforcing plate 8 folded with the second reinforcing side wall portion 7 and the other second reinforcing side wall portion 7 ′, the long support plate 3 and the short support plate 4 are accommodated in parallel, and FIG. Can be folded compactly as shown in FIG.

[Mating protrusion]
Further, a rectangular fitting projection 12 is fixed to the lower surface of the auxiliary bottom wall 11 at a position closer to the inside by the thickness of each surface of the second side wall body 6.
The fitting protrusion 12 can be used as a latching guide when stacking the assembled folding storage box 1 up and down (see FIG. 2).
Therefore, as described above, the upper end of the second reinforcing side wall 7 is shorter than the upper end of the second side wall body 6 by a length that allows the fitting protrusion 12 to be fitted.

The foldable storage box 1 shown in FIG. 8 shows different embodiments having a configuration in which the bottom plate is divided into two parts.
A bottom plate component piece 8a set to a length corresponding to a half of the bottom plate is connected to a lower end of each second reinforcing side wall portion 7 via a lower hinge H3 so as to be foldable.
Also, a latching piece 8c is fixed below the bottom plate constituting piece 8a, and when the plate is horizontally deployed, the lower end side of one bottom plate constituting piece 8a can be locked to the upper end of the other hanging piece 8c. (See FIG. 8a).
Moreover, the said latching piece may be integrally formed with the baseplate component piece, and the latching part 8b is formed in the front-end | tip at the bottomplate component piece 8a shown in FIG.8 (c), and it expand | deploys horizontally. When this is done, the left and right side edge portions of the pair of bottom plate constituting pieces 8a can be locked.

Further, in this embodiment, lower bent portions 3b and 4b are formed at the lower ends of the long support plate 3 and the short support plate 4 at a substantially right angle on the bottom side of the box. The bottom plate component piece 8a can be supported by abutting against the back surfaces of the pair of bottom plate component pieces 8a.
In the illustrated example, since the auxiliary bottom wall 11 is provided, the lower bent portions 3 b and 4 b are preferably set so that the upper surface thereof is flush with the upper surface of the auxiliary bottom wall 11.
Further, when the lower bent portions 3b and 4b are provided, the auxiliary bottom wall 11 may be omitted.
Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

In the foldable storage box 1 shown in FIG. 9, an intermediate hinge H4 is formed so that the bottom plate 8 can be folded at its midway position.
This intermediate hinge H4 has an upward V-shaped groove so that it does not bend downward when deployed horizontally. Alternatively, the outer liner may be left and cut in half.
In this case, when folded in parallel, the thickness is twice that of the above embodiment, but this is suitable when the bottom plate 8 is long.
Since other configurations are the same as those in the above embodiment, the description thereof is omitted.
In each of the above embodiments, the first side wall 2 and the second side wall 5 have a double structure, but they may be formed by a single plastic hollow body sheet.

The foldable storage box 1 of Example 4 shown in FIGS. 10 to 13 has a structure provided with an upper lid piece that closes the upper opening.
As in the previous embodiment, the folding storage box 1 extends along the short direction of the rectangular cross section and is opposed to the pair of first side walls 2 provided substantially facing the center and extending along the longitudinal direction. A pair of second side walls 5 and a bottom plate 8 connected to the second side wall 5 so as to be bendable.

The first side wall 2 includes a first side wall main body 20 provided with an inner folding hinge H1 in the center and a longitudinal support plate fixed to one first side wall main body 21 divided into two by the inner folding hinge H1. 3 and a short support plate 4 fixed to the other first side wall main body 22.
In the pair of first side walls 2, the long support plate 3 and the short support plate 4 are arranged in the same direction so as to face each other.

The second side wall 5 includes a second side wall body 6 and a second reinforcing side wall portion 7 fixed along the inside of the second side wall body 6 in the same manner as in the embodiment.
Each of the second reinforcing side wall portions 7 has an upper lid component piece 30a, 30b that is divided into two parts constituting an upper lid piece 30 that closes the upper opening of the box at the time of assembly through a horizontally extending second upper hinge H6. Are connected to each other in a foldable manner.
Similarly to the second embodiment, a bottom plate component piece 8a is foldably connected to each second reinforcing side wall portion 7 via the lower hinge H3 at the lower end of the second reinforcing side wall portion 7. The structure may be the same as in the first and third embodiments.

Also, above the long support plate 3 and the short support plate 4, upper lid support pieces 3a, 4a that are bent substantially at right angles to the inner side of the upper opening of the box at the time of assembly through a horizontally extending first upper hinge H5. The provided upper lid support piece portions 3a, 4a are set to positions that support the upper lid component pieces 30a, 30b by abutting against the back surfaces of the horizontally expanded upper lid component pieces 30a, 30b when bent. (See FIGS. 11 and 12).
Further, lower bent portions 3b and 4b are formed at lower portions of the long support plate 3 and the short support plate 4 so as to support the developed bottom plate constituting piece 8a (see FIG. 12).

The upper lid constituent pieces 30a and 30b of the present embodiment form an insertion piece 31 whose front edge is bent at a substantially right angle.
A gap S set to a predetermined length for inserting the insertion piece 31 is formed between the adjacent upper lid support component pieces 3a and 4a.

Therefore, the length of the upper lid constituting pieces 30a, 30b is set to a length in which the insertion piece 31 is inserted into the gap S and the opposing insertion pieces 31, 31 are in contact with each other with almost no gap.
The gap S may be formed by cutting out one upper lid support component piece 3a or 4a, or may be formed by cutting out both upper lid support component pieces 3a and 4a. The support component piece 3a is formed by cutting out the tip.

In the present embodiment, since the length of the upper lid component piece is set according to the position of the gap S, the case where the lengths of the upper lid component pieces 30a and 30b are different is shown. good.
In that case, what is necessary is just to form the clearance gap S in the middle position of the upper cover support piece part 3a of the longitudinal support plate 3. FIG.

FIG. 14 shows the foldable storage box 1 according to the fifth embodiment in which the upper cover piece 30 has one configuration.
In this embodiment, the upper lid piece 30 is connected to one second reinforcing side wall portion 7 via the second upper hinge H6, and the other second reinforcing side wall portion 7 is not provided with an upper lid piece.
If the upper lid piece 30 is provided with an upper lid folding hinge H7 for folding in the center, the upper lid piece 30 can be folded and stored compactly as indicated by the dotted line in the figure when not in use.
If the upper lid piece 30 is long, a plurality of hinges may be provided in the middle of the upper lid piece 30 so that it can be folded into two or more.

In this embodiment, since the insertion piece 31 is formed at the tip of the upper lid piece 30, the gap S into which the insertion piece 31 is inserted is a longitudinal support plate adjacent to the other second reinforcing side wall portion 7. 3 or the short support plate 4 (long support plate 3 in the illustrated example) and the other second reinforcing side wall portion 7, there is no need to cut out the upper lid support piece 3 a or 4 a.
Further, since the structure of the bottom plate 8 and the like is the same as that of the third embodiment, the description thereof is omitted.

In Examples 4 and 5 in which the upper cover piece is provided, the fitting protrusion for stacking is not provided.
The present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention in addition to a configuration in which the configurations of the respective embodiments are appropriately combined.

DESCRIPTION OF SYMBOLS 1 Folding type storage box 2 1st side wall 3 Longitudinal support plate 3a Upper lid support piece part 3b Lower bent part 4 Short support plate 4a Upper lid support piece part 4b Lower bent part 5 Second side wall 6 Second side wall body 6a Wide surface 6b Consecutive piece 7 Second reinforcing side wall 8 Bottom plate 8a Bottom plate constituting piece 11 Auxiliary bottom wall 12 Projecting surface 20 for fitting 20 First side wall main body 21 One first side wall main body 22 Other first side wall main body 30 Upper lid pieces 30a, 30b Upper lid component 31 Insertion piece H1 Inner folding hinge H2 Corner hinge H3 Lower hinge H4 Intermediate hinge H5 First upper hinge H6 Second upper hinge H7 Upper lid folding hinge L, L 'Separation line S Gap

Claims (7)

The folding cross section of the folding storage box at the time of unfolding consists of a square cross section,
A pair of first side walls provided opposite to either the vertical or horizontal direction of the cross-sectional square, a second side wall provided opposite to either the vertical or horizontal direction, and a first side wall near the corner portion A corner hinge provided on one side wall and extending in a height direction to bendably connect the first side wall and the second side wall; and a lower end of the second side wall connected to be bent via a lower hinge. A hollow box made of a synthetic resin having a bottom plate, and the first side wall has an inner folding hinge extending in the height direction at the center, and the first side wall is formed through the inner folding hinge and the corner hinge. In the folding storage box composed of a synthetic resin hollow body sheet having a first side wall body that can be folded inward of the box,
A longitudinal support plate that is fixed to each first side wall so as to overlap the inside of the first side wall main body and extends from one side to the midway position beyond the inner folding hinge at a location that does not overlap the pair of corner hinges, A short support plate extending to a position aligned with the end of the long support plate when the box is assembled without exceeding the folding hinge;
A foldable storage box, wherein the lower part of the long support plate and the short support plate is held in the same plane in abutment with the side end surface of the bottom plate that is horizontally deployed. Each of the pair of second side walls includes a second side wall body and a second reinforcing side wall portion fixed along the inside of the second side wall body.
A pair of first side wall, below the second reinforcement side wall, and consecutively provided a bottom plate capable folded over the lower hinge extending horizontally,
The second side wall body is formed so as to be foldable or unfoldable integrally with a continuous piece extending from a corner portion at both ends to a corner hinge of the adjacent first side wall body. Foldable storage box. The second side wall main body integrally has an auxiliary bottom wall that closes a rectangular region surrounded by the lower end of the second side wall main body and the lower end of the adjacent connecting piece,
The foldable storage box according to claim 2, wherein the auxiliary bottom wall is disposed at a position where it comes into contact with the back surface of the bottom plate when the bottom plate is deployed substantially horizontally.   The upper lid piece for closing the upper opening of the box at the time of assembly is connected to the upper side of the second reinforcing side wall so as to be foldable via a horizontally extending second upper hinge. Foldable storage box as described in   From a single bottom plate that is foldably connected below one second reinforcing side wall, or a pair of bottom plate components that are foldably connected below the pair of second reinforcing side walls, respectively. The foldable storage box according to claim 2, wherein the foldable storage box is formed.   On the lower surface of the auxiliary bottom wall, there is formed a fitting protrusion that can be fitted to the inner peripheral surface of the upper end of the second side wall of another folding storage box disposed below, and the folding storage box is The foldable storage box according to claim 3, wherein stacking is possible.   The folding storage box according to any one of claims 1 to 3, wherein the longitudinal support plate and the short support plate provided on the opposing first side walls are arranged in opposite directions. .

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