JP7556899B2 - Boxes and blanks - Google Patents

Description

The present invention relates to a storage box that has a rectangular bottom surface and first to fourth side surfaces that form side walls, is open at the top, and is stackable, and to a blank for assembling the storage box.

A conventional storage box 500 that is open at the top and stackable has been known, as shown in the oblique view of Figure 10, a rectangular bottom 550 and a first side 510, a second side 520, a third side 530, and a fourth side 540 that are folded from each edge of the rectangular bottom 550 to form side walls.
This known storage box is assembled into a rectangular cylindrical shape by fixing flaps 512 and 532 provided on both sides of a first side surface 510 and a third side surface 530, respectively, to a second side surface 520 and a fourth side surface 540.
In addition, extensions 515 and 535 are provided on the upper sides of the first side surface 510 and the third side surface 530, and the extensions 515 and 535 are bent to provide flat portions at their upper ends.

Further, a recess 507 is provided at the center of the bottom surface 550 side of the first side surface 510 and the third side surface 530, and a protrusion 508 is provided at the center of the upper surface side.
Furthermore, the first side surface 510 and the third side surface 530 are provided with a plurality of ventilation holes 514 and 534 .
When these known storage boxes 500 are stacked, the upper storage box 500 is supported on the flat portion formed by the lower extension 535, and the upper and lower recesses 507 and protrusions 508 fit together to align the boxes, preventing misalignment and collapse of the load.
At this time, the load is mainly supported by the side surfaces 510, 520, 530, and 540.

JP 2016-34847 A

Each side 510, 520, 530, 540 of this known storage box 500 can withstand a certain amount of load, but if the strength of each side 510, 520, 530, 540 is reduced due to changes in temperature or humidity, it will not be able to withstand the load, and the storage box 500 below will deform, causing shifting or collapse of the load, or there is a risk of damage to the items stored in the storage box 500.
Furthermore, when the storage boxes 500 are stacked and the central portion is lifted using a lifting tool, the load is concentrated on the first side 510 and the third side 530 of the bottommost storage box 500, causing the sides and bottom to easily deform.

In addition, the multiple ventilation holes 514 and ventilation holes 534 provided on the first side 510 and the third side 530 are provided to quickly transmit temperature and humidity changes to the items stored in the storage box 500, but since providing these holes reduces the strength of the first side 510 and the third side 530, it was necessary to sacrifice breathability in order to prevent deformation.
In order to prevent shifting or collapse of the cargo due to the load, it is possible to consider a structure in which the upper and lower storage boxes fit together as a whole, as shown in Patent Document 1, for example. However, this reduces the storage capacity relative to the height of the storage box, and at the same time, it is difficult to solve the problem that breathability must be sacrificed to prevent deformation.

To provide a storage box having a simple structure, which prevents shifting or collapse of the contents even when stacked in multiple layers, and prevents damage to stored items, and which can prevent deformation due to load without impairing breathability.
In addition, "upper" and "lower" as used in this specification refer to the directions corresponding to "upper" and "lower" when the container is placed on a horizontal surface.

The present invention solves the above problem by providing a storage box having a rectangular bottom surface and first to fourth side surfaces forming side walls, with corner reinforcement sections on the inner side of the corners where the sides are adjacent to each other, a recess in at least one corner of the bottom surface, and a protrusion in the upper part of the side surface at a position corresponding to the recess that fits into the recess of another storage box.

According to the storage box of claim 1, the inner sides of the corners where each side is adjacent to each other have corner reinforcement portions, which allows the corner reinforcement portions to withstand the load when stacked. Therefore, even if ventilation holes or the like are provided on each side or the strength of each side is reduced, deformation due to the load is prevented.
In addition, the bottom surface has a recess in at least one corner, and the upper part of the side surface is provided with a protrusion that fits into the recess of another storage box, so that top and bottom positioning can be achieved in the area where the load is concentrated, and even when stacked in multiple layers, shifting or collapse of the load and damage to the stored items can be prevented.
In addition, the corner reinforcing portion reinforces the corners, increasing the rigidity of the entire storage box and preventing distortion.
In addition, since the cross-sections in a plane parallel to the bottom surfaces of the concave and convex portions have a shape that encompasses the cross-sections in a plane parallel to the bottom surface of the corner reinforcement portion when viewed from above, the corner reinforcement portions of the stacked upper and lower storage boxes support the load without going through the bottom surface, further reducing the vertical strength required of each side surface.
Furthermore, since the upper surface of the convex portion becomes a flat surface of a prescribed area and can bear the load, the convex portion will not be deformed or damaged even if pallets or the like that do not have corresponding concave portions are stacked on top of each other.
Furthermore, since the recesses and protrusions can be fitted together using the thickness of the plates, the amount of lifting of the storage box during loading and unloading can be made extremely small.

According to the configuration described in claim 2, the corner reinforcement portion is composed of a columnar reinforcement portion formed in a columnar shape or a side wall reinforcement portion formed so as to overlap adjacent both side surfaces, thereby making it possible to achieve an optimal design that does not affect the storage efficiency depending on the shape of the stored items.

According to the storage box of claim 3 , the cross sections of the concave and convex portions in a plane parallel to the bottom surface have approximately the same shape as the cross section of the corner reinforcement portion in a plane parallel to the bottom surface when viewed from above, or a shape that does not exceed the range of the cross section of the corner reinforcement portion in a plane parallel to the bottom surface when viewed from above.This means that the convex portions do not protrude from the corner reinforcement portions into the storage space, preventing the top of the stored items from getting caught on the convex portions and making it possible to easily store the stored items even after the box is made.
This allows the assembly of the storage box to be completed before the contents are placed inside.
Furthermore, the recess does not extend from the corner reinforcing portion toward the storage space, ensuring the strength of the bottom surface.
In addition, since there is no need to provide large recesses in the four corners of the storage box, through holes can be provided in the bottom surface, improving breathability and ventilation efficiency.
According to the fourth aspect of the present invention , since the recessed and protruding portions are provided at all of the corners, it becomes possible to stack the containers in multiple layers in a more stable manner.

According to the configuration of the fifth aspect , the ventilation of the storage space is improved.
According to the blanks of the seventh to twelfth aspects of the present invention, the storage boxes of the first to sixth aspects of the present invention can be easily assembled from a single blank, and the amount of material to be discarded can be reduced.
Furthermore, by forming the blank from a single sheet of material, the recessed and protruding portions both have the same thickness, providing a necessary and sufficient fit.

FIG. 2 is a development view of a storage box according to the first embodiment of the present invention. FIG. 1 is a perspective view (reference photograph) of a storage box according to a first embodiment of the present invention. FIG. 2 is a perspective view (reference photograph) of the bottom side of the storage box according to the first embodiment of the present invention. FIG. 6 is a development view of a storage box according to a second embodiment of the present invention. FIG. 6 is a perspective view (reference photograph) of a storage box according to a second embodiment of the present invention. FIG. 11 is a perspective view (reference photograph) of a storage box according to a second embodiment of the present invention, seen from the bottom side. FIG. 11 is a perspective view (reference photograph) of a storage box according to a third embodiment of the present invention. FIG. 11 is a perspective view (reference photograph) of a storage box according to a third embodiment of the present invention, seen from the bottom side. FIG. 1 is an explanatory diagram of a stack of storage boxes according to the present invention. FIG.

The storage box of the first embodiment of the present invention has a rectangular bottom surface 150 and a first side surface 110, a second side surface 120, a third side surface 130 and a fourth side surface 140 that are folded from each edge of the rectangular bottom surface 150 to form side walls, as shown in the expanded view of Figure 1 and the oblique views of Figures 2 and 3.
In this embodiment, the bottom surface 150 is rectangular, with the first side surface 110 and the third side surface 130 being longer than the second side surface 120 and the fourth side surface 140 .
The first side surface 110 and the third side surface 130 have flaps 112, 132 that are connected to the second side surface 120 and the fourth side surface 140 in a bendable manner and form a corner reinforcement portion 109.

The flaps 112, 132 have flap main bodies 112A, 132A adjacent to the first side 110, the third side 130 and fixed along the second side 120, the fourth side 140 during assembly, flap middle bodies 112B, 132B folded from the flap main bodies 112A, 132A toward the first side 110, the third side 130, and flap tip portions 112C, 132C folded from the flap middle portions 112B, 132B and fixed along the first side 110, the third side 130, and a corner reinforcement portion 109 is formed during assembly by a portion of the flap 112, 132 sides of the first side 110, the third side 130, the flap main bodies 112A, 132A, and the flap middle portions 112B, 132B.
In this embodiment, the corner reinforcement portion 109 is formed as a columnar reinforcement portion.

The lower edges of the flaps 112, 132 are formed to extend approximately in line with the fold lines between the first side 110, the third side 130 and the bottom surface 150, and are configured so that the lower end of the corner reinforcement portion 109 is approximately in the same plane as the upper surface of the bottom surface 150 when assembled.
The flap intermediate portions 112B, 132B form one side of the corner reinforcement portion 109 and also function as clamps between the second side 120, the fourth side 140 and the first side 110, the third side 130, thereby strengthening the fixation between the second side 120, the fourth side 140 and the first side 110, the third side 130 and improving the rigidity of the storage box 100.

A cutout 151 that forms the recess 107 is provided at the corner of the bottom surface 150 .
The first side surface 110 and the third side surface 130 have protruding pieces 113, 133 that form a protruding portion 108 that is bendably connected to the opposite side of the cutout portion 151 of the bottom surface 150.
The convex portion 113, 133 has a convex main body portion 113A, 133A that is bent from the first side surface 110 and the third side surface 130 to form the convex portion 108, and a convex tip portion 113B, 133B that is further bent from the convex main body portion 113A, 133A and fixed to the outer surfaces of the second side surface 120 and the fourth side surface 140.

The upper edges of the flaps 112, 132 are formed to extend approximately in the same line as the fold lines between the first side surface 110, the third side surface 130 and the convex piece main body portions 113A, 133A, and are configured so that the upper end surface of the corner reinforcement portion 109 is approximately in the same plane as the lower surfaces of the convex piece main body portions 113A, 133A when assembled.
A small gap is permitted to allow for manufacturing errors and ease of assembly.
By fixing the convex piece tip portions 113B, 133B to the outer surfaces of the second side surface 120 and the fourth side surface 140, the fixation between the second side surface 120, the fourth side surface 140 and the first side surface 110, the third side surface 130 is strengthened, and the rigidity of the storage box 100 is improved.

The recesses 107 at the four corners are each provided below the corner reinforcement portion 109, and the four protrusions 108 are each provided above the corner reinforcement portion 109, and when viewed from above, the cross sections in a plane parallel to the bottom surfaces of the recesses 107 and protrusions 108 have a shape that encompasses the cross section in a plane parallel to the bottom surface of the corner reinforcement portion 109.
The convex piece main body portions 113A, 133A are capable of contacting the upper end of the corner reinforcing portion 109, and are capable of contacting the lower end of the corner reinforcing portion 109 of the upper storage box 100 in the stack.
As a result, when the storage boxes 100 are stacked one on top of the other, the convex portion 108 of the lower storage box 100 fits into the concave portion 107 of the upper storage box 100 to position it, and only the convex piece main body portions 113A, 133A that constitute the convex portion 108 of the lower storage box 100 are sandwiched between the corner reinforcement portions 109 of the upper and lower storage boxes 100, thereby mainly supporting the load when stacked.

The first side surface 110 and the third side surface 130 have folded portions 111 and 131 connected to the opposite sides of the sides of the bottom surface 150 in a bendable manner.
The folded-back portions 111, 131 have main body portions 111A, 131A that are foldably connected to the first side surface 110 and the third side surface 130, and tip portions 111B, 131B that are foldably connected to the main body portions 111A, 131A, and notches 111C, 131C are provided at the bending portions between the main body portions 111A, 131A and the tip portions 111B, 131B.
In addition, the first side surface 110 and the third side surface 130 are provided with a plurality of ventilation holes 114, 134, and the main body portions 111A, 131A of the folded-back portions 111, 131 are also provided with ventilation holes at positions that overlap when folded back.

In addition, it is preferable that above the folded-back portions 111, 131, openings 116, 136 that are open on the sides are formed when the storage boxes 100 are stacked one on top of the other.
The folded-back portions 111, 131 have cut-outs 111C, 131C between the main body 111A, 131A and the tip portions 111B, 131B, which makes it possible to reduce the return force caused by folding back the tip portions 111B, 131B. This improves the degree of contact between the folded-back portions 111, 131 and the bottom surface 150, the first side surface 110, and the third side surface 130, and further improves the strength of the bottom surface 150, the first side surface 110, and the third side surface 130, suppressing deformation, and improving the rigidity of the storage box 100.

The storage box of the second embodiment of the present invention has a rectangular bottom surface 250 and a first side surface 210, a second side surface 220, a third side surface 230 and a fourth side surface 240 which are folded from each edge of the rectangular bottom surface 250 to form side walls, as shown in the expanded view of Figure 4 and the oblique views of Figures 5 and 6.
In this embodiment, the bottom surface 250 is rectangular, with the first side surface 210 and the third side surface 230 being longer than the second side surface 220 and the fourth side surface 240 .
The first side surface 210 and the third side surface 230 have flaps 212, 232 that are connected to the second side surface 220 and the fourth side surface 240 in a bendable manner and form a corner reinforcement portion 209.

The flaps 212, 232 have flap main bodies 212A, 232A adjacent to the first side 210, the third side 230 and fixed along the second side 220, the fourth side 240 during assembly, flap middle bodies 212B, 232B folded from the flap main bodies 212A, 232A toward the first side 210, the third side 230, and flap tip bodies 212C, 232C folded from the flap middle bodies 212B, 232B and fixed along the first side 210, the third side 230, and a corner reinforcement portion 209 is formed during assembly by a portion of the first side 210, the third side 230 on the flap 212, 232 side, the flap main bodies 212A, 232A, and the flap middle bodies 212B, 232B.
In this embodiment, the corner reinforcement portion 209 is formed as a columnar reinforcement portion.

The lower edges of the flaps 212, 232 are formed to extend approximately in line with the fold lines between the first side 210, the third side 230 and the bottom surface 250, and are configured so that the lower end of the corner reinforcement portion 209 is approximately in the same plane as the upper surface of the bottom surface 250 when assembled.
The flap intermediate portions 212B, 232B form one side of the corner reinforcement portion 209 and also function as clamps between the second side 220, the fourth side 240 and the first side 210, the third side 230, thereby strengthening the fixation between the second side 220, the fourth side 240 and the first side 210, the third side 230 and improving the rigidity of the storage box 200.

A cutout 251 that forms the recess 207 is provided at the corner of the bottom surface 250 .
In addition, a ventilation hole 252 is provided in the center of the bottom surface 250 to improve breathability and ventilation efficiency.
The first side surface 210 and the third side surface 230 have protruding pieces 213 , 233 that form a protruding portion 208 that is bendably connected to the opposite side of the cutout portion 251 of the bottom surface 250 .
The convex portion 213, 233 has a convex main body portion 213A, 233A that is bent from the first side surface 210 and the third side surface 230 to form the convex portion 208, and a convex tip portion 213B, 233B that is further bent from the convex main body portion 213A, 233A and fixed to the outer surfaces of the second side surface 220 and the fourth side surface 240.

The upper edges of the flaps 212, 232 are formed to extend approximately in the same line as the fold lines between the first side surface 210, the third side surface 230 and the convex piece main body portions 213A, 233A, and are configured so that the upper end surface of the corner reinforcement portion 209 is approximately in the same plane as the lower surfaces of the convex piece main body portions 213A, 233A when assembled.
A small gap is permitted to allow for manufacturing errors and ease of assembly.
By fixing the convex piece tip portions 213B, 233B to the outer surfaces of the second side surface 220 and the fourth side surface 240, the fixation between the second side surface 220, the fourth side surface 240 and the first side surface 210, the third side surface 230 is strengthened, and the rigidity of the storage box 200 is improved.

The recesses 207 at the four corners are each provided below the corner reinforcement portion 209, and the four protrusions 208 are each provided above the corner reinforcement portion 209, and when viewed from above, the cross sections in a plane parallel to the bottom surface of the recesses 207 and protrusions 208 have approximately the same shape as the cross sections in a plane parallel to the bottom surface of the corner reinforcement portion 209.
The convex piece main body portions 213A, 233A are capable of contacting the upper end of the corner reinforcement portion 209, and are capable of contacting the lower end of the corner reinforcement portion 209 of the upper storage box 200 in the stack.
As a result, when the storage boxes 200 are stacked one on top of the other, the convex portion 208 of the lower storage box 200 fits into the concave portion 207 of the upper storage box 200 to position it, and only the convex piece main body portions 213A, 233A that constitute the convex portion 208 of the lower storage box 200 are sandwiched between the corner reinforcement portions 209 of the upper and lower storage boxes 200, thereby mainly supporting the load when stacked.

In addition, when viewed from above, the cross section in a plane parallel to the bottom surfaces of the recessed portion 207 and the protruding portion 208 may have a shape that does not exceed the range of the cross section in a plane parallel to the bottom surface of the corner reinforcement portion 209.
In this case, when the storage boxes 200 are stacked one on top of the other, the convex portion 208 of the lower storage box 200 fits into the concave portion 207 of the upper storage box 200 to position it, and the convex piece main body portions 213A, 233A constituting the convex portion 208 of the lower storage box 200 and the bottom surface 250 of the upper storage box 200 are sandwiched between the corner reinforcement portions 209 of the upper and lower storage boxes 200, thereby mainly supporting the load when stacked.
Regardless of the shape of the recess 207 and the protrusion 208, the protrusion 208 does not protrude from the corner reinforcement 209 into the storage space, and the upper part of the stored item does not get caught on the protrusion 208, so that it is possible to complete the assembly of the storage box 200 before storing the stored item.
In addition, since there is no cut-out portion due to recess 207 near the corners of bottom surface 250 and toward the center of corner reinforcement portion 209, the strength of bottom surface 250 is guaranteed, and sufficient strength can be ensured even if a separate ventilation hole 252 is provided.

The first side surface 210 and the third side surface 230 have folded portions 211 , 231 connected to the opposite sides of the sides of the bottom surface 250 in a bendable manner.
The folded-back portions 211, 231 have main body portions 211A, 231A that are foldably connected to the first side surface 210 and the third side surface 230, and tip portions 211B, 231B that are foldably connected to the main body portions 211A, 231A, and notches 211C, 231C are provided at the bending portions between the main body portions 211A, 231A and the tip portions 211B, 231B.
In addition, the first side surface 210 and the third side surface 230 are provided with a plurality of ventilation holes 214, 234, and the main body portions 211A, 231A of the folded-back portions 211, 231 are also provided with ventilation holes at positions that overlap when folded back.

In addition, it is preferable that above the folded-back portions 211, 231, openings 216, 236 that are open on the sides are formed when the storage boxes 200 are stacked one on top of the other.
The folded-back portions 211, 231 have cut-outs 211C, 231C between the main body 211A, 231A and the tip 211B, 231B, which makes it possible to reduce the return force caused by folding back the tip 211B, 231B. This improves the degree of contact between the folded-back portions 211, 231 and the bottom surface 250, the first side surface 210, and the third side surface 230, and further improves the strength of the bottom surface 250, the first side surface 210, and the third side surface 230, suppressing deformation, and improving the rigidity of the storage box 200.
In addition, when the containing box 200 is formed, it is preferable that the height of the second side surface 220 and the fourth side surface 240 is formed to be lower than the height of the corner reinforcement portion 209 .
Since the second side surface 220 and the fourth side surface 240 do not provide vertical strength when stacked, a space for ventilation can be formed without reducing the strength when stacked.

Furthermore, in this embodiment, the cross sections of the concave portion 207 and the convex portion 208 in a plane parallel to the bottom surface thereof have approximately the same shape as the cross section of the corner reinforcement portion 209 in a plane parallel to the bottom surface thereof, so that the convex portion 208 does not protrude from the corner reinforcement portion 209 into the storage space, and it is possible to complete the production of the storage box before storing the items to be stored.
In a conventional storage box, such as storage box 500 shown in FIG. 10, a box-making machine makes the box until the upper extensions 515, 535 on the first side 510 and the third side 530 are upright, and then the contents are picked up by a robot or the like and stored inside storage box 500, and then in a later process using the box-making machine, the extensions 515, 535 are folded and glued together to seal the box.
In this embodiment, before the contents are placed inside the box, the convex pieces 213, 233 that make up the convex portion 208 are folded and glued to complete the box-making process, and then the contents can be picked up by a robot or the like and placed inside the box 200, which simplifies the box-making and sealing processes and allows the box-making machine to have a simple configuration.
This increases the manufacturing speed of containers containing items and reduces manufacturing costs.

As shown in the oblique views of Figures 7 and 8, the storage box of the third embodiment of the present invention has a rectangular bottom surface 350 and a first side surface 310, a second side surface 320, a third side surface 330 and a fourth side surface 340 that are folded from each edge of the rectangular bottom surface 350 to form side walls.
In this embodiment, the bottom surface 350 is substantially square, and the first side surface 310 and the third side surface 330 and the second side surface 320 and the fourth side surface 340 are substantially the same length.
The first side surface 310 and the third side surface 330 have flaps 312, 332 that are connected to the second side surface 320 and the fourth side surface 340 in a bendable manner and form a corner reinforcement portion 309.

The flaps 312, 332 are made up of flap main body portions 312A, 332A that are adjacent to the first side surface 310 and the third side surface 330 and are fixed along the second side surface 320 and the fourth side surface 340 during assembly, flap intermediate portions 312B, 332B that are folded from the flap main body portions 312A, 332A toward the first side surface 310 and the third side surface 330 and overlap with the flap main body portions 312A, 332A, and 12B, 332B and flap tip portions 312C, 332C which are folded along the first side 310 and the third side 330, and the corner reinforcement portion 309 is formed during assembly by a portion of the flap 312, 332 sides of the first side 310 and the third side 330, the flap main body portions 312A, 332A, the flap intermediate portions 312B, 332B and the flap tip portions 312C, 332C.
In this embodiment, the corner reinforcement portion 309 is formed as a sidewall reinforcement portion that is formed to overlap the side surface.

The lower edges of the flaps 312, 332 are formed to extend approximately in line with the fold lines between the first side 310, the third side 330 and the bottom surface 350, and are configured so that the lower end of the corner reinforcement portion 309 is approximately in the same plane as the upper surface of the bottom surface 350 when assembled.
A cutout 351 that forms the recess 307 is provided at the corner of the bottom surface 350 .
Also, the bottom surface 350 may be provided with ventilation holes to improve breathability, similar to the second embodiment.
The first side surface 310 and the third side surface 330 have protruding pieces 313 and 333 that form a protruding portion 308 that is bendably connected to the opposite side of the cutout portion 351 of the bottom surface 350 .
The convex portion 313, 333 has a convex main body portion 313A, 333A that is folded from the first side surface 310 and the third side surface 330 to form the convex portion 308, and a convex tip portion 313B, 333B that is further folded from the convex main body portion 313A, 333A and fixed to the outer surface of the flap main body portion 312A, 332A.
In this embodiment, the protruding piece tip portions 313B and 333B form the same plane as the second side surface 320 and the fourth side surface 340.

The upper edges of the flaps 312, 332 are formed to extend approximately in the same line as the fold lines between the first side surface 310, the third side surface 330 and the convex piece main body portions 313A, 333A, and are configured so that the upper end surface of the corner reinforcement portion 309 is approximately in the same plane as the lower surfaces of the convex piece main body portions 313A, 333A when assembled.
A small gap is permitted to allow for manufacturing errors and ease of assembly.

The recesses 307 at the four corners are each provided below the corner reinforcement portion 309, and the four protrusions 308 are each provided above the corner reinforcement portion 309, and the length of the recesses 307 and protrusions 308 along each side is approximately the same as the length of the corner reinforcement portion 309 along each side.
The convex piece main body portions 313A, 333A are capable of contacting the upper end of the corner reinforcing portion 309, and are capable of contacting the lower end of the corner reinforcing portion 309 of the upper storage box 300 in the stack.
As a result, when the storage boxes 300 are stacked one on top of the other, the convex portion 308 of the lower storage box 300 fits into the concave portion 307 of the upper storage box 300 to position it, and only the convex piece main body portions 313A, 333A that constitute the convex portion 308 of the lower storage box 300 are sandwiched between the corner reinforcement portions 309 of the upper and lower storage boxes 300, and mainly support the load when stacked.

The length of the recess 307 and the protrusion 308 along each side surface may be such that it does not exceed the length of the corner reinforcement portion 309 along each side surface.
In this case, when the storage boxes 300 are stacked one on top of the other, the convex portion 308 of the lower storage box 300 fits into the concave portion 307 of the upper storage box 300 to position it, and the convex piece main body portions 313A, 333A constituting the convex portion 308 of the lower storage box 300 and the bottom surface 350 of the upper storage box 300 are sandwiched between the corner reinforcement portions 309 of the upper and lower storage boxes 300, thereby mainly supporting the load when stacked.

The first side surface 310 and the third side surface 330 have folded portions 311 ( 331 ) connected to the opposite sides of the sides of the bottom surface 350 in a bendable manner.
The second side surface 320 and the fourth side surface 340 are provided with a plurality of ventilation holes 324, 344.
In addition, it is preferable that above the folded-back portions 311, 331, openings 316, 336 that are open on the sides are formed when the storage boxes 300 are stacked one on top of the other.
In addition, when the containing box 300 is formed, it is preferable that the heights of the second side surface 320 and the fourth side surface 340 are formed to be lower than the height of the corner reinforcing portion 309 .
Since the second side surface 320 and the fourth side surface 340 do not provide vertical strength when stacked, a space for ventilation can be formed without reducing the strength when stacked.

When the storage boxes 100, 200, 300 formed as described above are stacked, as shown in FIG. 9, the upper storage boxes 100, 200, 300 are positioned by the convex portions 108, 208, 308 of the lower storage boxes 100, 200, 300 fitting into the concave portions 107, 207, 307 of the upper storage boxes 100, 200, 300, thereby preventing misalignment and collapse of the load.
In this case, even when stacked in multiple tiers, most of the load is supported by the corner reinforcement portions 109, 209, 309 via the convex piece main body portions 113A, 133A, 213A, 233A, 313A, 333A that constitute the convex portions 108, 208, 308 of the lower storage boxes 100, 200, 300, and no load greater than a predetermined level is applied to the first side surfaces 110, 210, 310, the second side surfaces 120, 220, 320, the third side surfaces 130, 230, 330 and the fourth side surfaces 140, 240, 340. As a result, the required strength in the vertical direction can be reduced and it is possible to provide many ventilation hole portions 114, 134, 214, 234, 324, 344 or to enlarge the folded-back portions 111, 131, 211, 231, 311, 331.
In addition, in the above embodiment, the rigidity of the storage boxes 100, 200, 300 can be improved by the corner reinforcement portions 109, 209, 309, the folded portions 111, 131, 211, 231, 311, 331, and the convex portions 113, 133, 213, 233, 313, 333, so that even when the lifting tool T is used to lift the central portion of the bottom surface 150, 250, 350 of the lowest storage box 100, 200, 300, deformation is less likely to occur, and the lifting tool T can be made narrow.

In the above embodiment, the storage boxes 100, 200, and 300 are assembled from a single blank, but they may be assembled by combining or pasting together a plurality of parts.
In addition, corner reinforcing parts 109, 209, 309 are present at the four corners of the bottom surfaces 150, 250, 350, and if there is at least one of them, the load sharing between the two side surfaces surrounding the corner can be reduced, and if there are two of them diagonally, the load sharing between the four side surfaces can be reduced.
In addition, in the above first and second embodiments, the corner reinforcement portions 109, 209 are triangular prism shaped, but they may be any shape, such as a polygonal prism, a cylindrical shape, or a shape having a partially curved surface, and may be a shape whose cross-sectional area is not uniform in the vertical direction.

In addition, in the above embodiment, the folded portions 111, 131, 211, 231, 311, 331 are provided on the first side surfaces 110, 210, 310 and the third side surfaces 130, 230, 330, but they may also be provided on the second side surfaces 120, 220, 320, the fourth side surfaces 140, 240, 340, or on all side surfaces, and if they are provided on at least one side surface, the strength of that side surface can be improved.
Furthermore, in the first and second embodiments described above, the ventilation holes 114, 134, 214, 234 are provided on the first side surface 110, 210 and the third side surface 130, 230, and in the third embodiment described above, the ventilation holes 324, 344 are provided on the second side surface 310 and the fourth side surface 340, but they may be provided on any side surface, on all side surfaces, on the bottom surfaces 150, 250, 350, or not at all.
Furthermore, although the storage box is generally made of cardboard, the paper quality may be any type, and the box may be coated with various types of coatings or made of materials other than paper.

100, 200, 300, 500 ... Storage box 107, 207, 307, 507 ... Recess 108, 208, 308, 508 ... Convex 109, 209, 309 ... Corner reinforcement 110, 210, 310, 510 ... First side 111, 211, 311 ... Folded-back portion 111A, 211A ... Main body 111B, 211B ... Tip 111C, 211C ... Cutout 112, 212, 312, 512 ... Flap 112A, 212A, 312A ... Flap main body 112B, 212B, 312B ... Flap middle 112C, 212C, 312C ... Flap tip portion 113, 213, 313 ... protruding piece portion 113A, 213A, 313A ... protruding piece main body portion 113B, 213B, 313B ... protruding piece tip portion 114, 214, 514 ... ventilation hole portion
515... Extension part 116, 216, 316... Opening part 120, 220, 320, 520... Second side surface
324 ... Ventilation hole portion 130, 230, 330, 530 ... Third side surface 131, 231, 331 ... Folded-back portion 131A, 231A ... Main body portion 131B, 231B ... Tip portion 131C, 231C ... Cutout portion 132, 232, 332, 512 ... Flap 132A, 232A, 332A ... Flap main body portion 132B, 232B, 332B ... Flap middle portion 132C, 232C, 332C ... Flap tip portion 133, 233, 333 ... Convex piece portion 133A, 233A, 333A ... Convex piece main body portion 133B, 233B, 333B ... Convex piece tip portion 134, 234, 534 ... Ventilation hole
535... Extension part 136, 236, 336... Opening part 140, 240, 340, 540... Fourth side surface
344: Ventilation hole portion 150, 250, 350, 550: Bottom surface 151, 251, 351: Punched portion 252: Ventilation hole T: Lifting tool

Claims (12)

A container having a rectangular bottom surface and first to fourth side surfaces forming side walls,
Each of the corners where the side surfaces are adjacent to each other has a corner reinforcing portion on the inner surface side,
The bottom surface has a recess in at least one corner,
The upper portion of the side surface has a protrusion at a position corresponding to the recess, the protrusion being adapted to fit into the recess of another storage box,
The recess is provided below the corner reinforcing portion,
The protrusion is provided above the corner reinforcement portion,
A storage box characterized in that a cross section of the recessed and protruding portions in a plane parallel to the bottom surface has a shape that encompasses a cross section of the corner reinforcement portion in a plane parallel to the bottom surface when viewed from above . The storage box according to claim 1, characterized in that the corner reinforcement is composed of a columnar reinforcement formed in a column shape or a sidewall reinforcement formed to overlap adjacent both side surfaces. A container having a rectangular bottom surface and first to fourth side surfaces forming side walls,
Each of the corners where the side surfaces are adjacent to each other has a corner reinforcing portion on the inner surface side,
The bottom surface has a recess in at least one corner,
The upper portion of the side surface has a protrusion at a position corresponding to the recess, the protrusion being adapted to fit into the recess of another storage box,
The recess is provided below the corner reinforcing portion,
The protrusion is provided above the corner reinforcement portion,
A storage box characterized in that the cross-sections of the concave and convex portions in a plane parallel to the bottom surface have approximately the same shape as the cross-sections of the corner reinforcement portions in a plane parallel to the bottom surface when viewed from above, or have a shape that does not exceed the range of the cross-sections of the corner reinforcement portions in a plane parallel to the bottom surface when viewed from above. 4. The storage box according to claim 1, wherein the recessed and protruding portions are provided at all of the corners. 5. The container according to claim 1, wherein the bottom surface has an air vent at a position different from the recess. 6. The storage box according to claim 1, wherein the corner reinforcing portion is a columnar reinforcing portion formed in a triangular prism shape. A blank for forming a storage box having a bottom surface and first to fourth side surfaces forming a rectangular side wall,
The container has a rectangular bottom surface and first to fourth side surfaces that are bendably connected to the four sides of the bottom surface,
The first and third opposing side surfaces have flaps that constitute corner reinforcement portions that are foldably connected to the second and fourth side surfaces, respectively;
At least one corner of the bottom surface is provided with a cutout portion that forms a recess,
the first side surface or the third side surface has a convex piece portion that forms a convex portion that is bendably connected to the opposite side of the cutout portion of the bottom surface,
the flap has a flap main body portion adjacent to the first side surface or the third side surface and fixed along the second side surface or the fourth side surface during assembly, a flap intermediate portion folded from the flap main body portion toward the first side surface or the third side surface, and a flap tip portion folded from the flap intermediate portion and fixed along the first side surface or the third side surface,
A columnar reinforcing portion, which is a columnar corner reinforcing portion, is configured by a part of the flap side of the first side surface or the third side surface, the flap main body portion, and the flap intermediate portion when assembled,
A blank , characterized in that the punched portion is configured to occupy a larger area than the corner reinforcement portion when assembled . A blank for forming a storage box having a bottom surface and first to fourth side surfaces forming a rectangular side wall,
The container has a rectangular bottom surface and first to fourth side surfaces that are bendably connected to the four sides of the bottom surface,
The first and third opposing side surfaces have flaps that constitute corner reinforcement portions that are foldably connected to the second and fourth side surfaces, respectively;
At least one corner of the bottom surface is provided with a cutout portion that forms a recess,
the first side surface or the third side surface has a convex piece portion that forms a convex portion that is bendably connected to the opposite side of the cutout portion of the bottom surface,
the flap has a flap main body portion adjacent to the first side surface or the third side surface and fixed along the second side surface or the fourth side surface during assembly, a flap intermediate portion folded from the flap main body portion toward the first side surface or the third side surface, and a flap tip portion folded from the flap intermediate portion and fixed along the first side surface or the third side surface,
A columnar reinforcing portion, which is a columnar corner reinforcing portion, is configured by a part of the flap side of the first side surface or the third side surface, the flap main body portion, and the flap intermediate portion when assembled,
A blank characterized in that the punched-out portion is configured to have substantially the same shape as the corner reinforcement portion or a shape that does not extend beyond the extent of the corner reinforcement portion when assembled. A blank for forming a storage box having a bottom surface and first to fourth side surfaces forming a rectangular side wall,
The container has a rectangular bottom surface and first to fourth side surfaces that are bendably connected to the four sides of the bottom surface,
The first and third opposing side surfaces have flaps that constitute corner reinforcement portions that are foldably connected to the second and fourth side surfaces, respectively;
At least one corner of the bottom surface is provided with a cutout portion that forms a recess,
the first side surface or the third side surface has a convex piece portion that forms a convex portion that is bendably connected to the opposite side of the cutout portion of the bottom surface,
The flap has a flap main body portion adjacent to the first side surface or the third side surface and fixed along the second side surface or the fourth side surface during assembly, a flap intermediate portion folded from the flap main body portion toward the first side surface or the third side surface and overlapping with the flap main body portion, and a flap tip portion folded from the flap intermediate portion and fixed along the first side surface or the third side surface,
A blank characterized in that a sidewall reinforcement portion, which is a corner reinforcement portion formed to overlap the side surface during assembly, is formed by a portion of the flap side of the first side surface or the third side surface, the flap main body portion, and the flap intermediate portion . 10. The blank according to claim 7, wherein the cut-out portion and the protruding portion are provided corresponding to at least two non-adjacent corners of the rectangular bottom surface. 11. The blank according to claim 7, wherein the bottom surface has an air vent at a position different from the cutout portion. 12. The blank according to claim 7, wherein the flap constitutes a corner reinforcement part having a triangular prism shape.

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