JP7746922B2 - packaging box - Google Patents

Description

The present invention relates to a packaging box.

Some cardboard packaging boxes have a lid formed by inserting the insert pieces of the front and rear end flaps into the connecting holes of the left and right side flaps from the outside, connecting the end flaps to the side flaps (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2004-345658

When assembling the lid of the conventional packaging box described above, the end flaps are folded, and then the insertion pieces are inserted into the connecting holes while flattening the end flaps so that the insertion pieces are positioned closer to the base end of the end flaps than the connecting holes in the side flaps. If a large load is placed on the end flaps when folding them, the corners of the box body can be significantly deformed, potentially causing the box body to tear from the corner.

The present invention aims to solve the above-mentioned problems and provide a packaging box that can prevent damage to the corners of the box body when assembling the lid.

To solve the above-mentioned problems, the present invention provides a packaging box comprising a box body having a cylindrical body portion having front and rear end walls and left and right side walls, and a lid portion provided at an opening in the vertical direction of the body portion. The lid portion includes end flaps connected to the end walls and left and right side flaps connected to each of the side walls, with the end flaps overlapping the outer surfaces of the side flaps. Each of the side flaps has a connecting hole formed therein , and the connecting hole is closed by a cover plate. An inclined portion is formed at the inner edge of the connecting hole at a front-to-rear outer portion, inclining inward in the horizontal direction as it extends inward in the vertical direction. A portion of the edge of the cover plate is connected to the inclined portion of the edge of the connecting hole via a fold line, and another portion of the edge of the cover plate is connected to the edge of the connecting hole via a slit. The tip of the end flap has left and right insertion pieces and a protruding piece located between the insertion pieces. The two insertion pieces are inserted into the two connecting holes, and the protruding pieces are superimposed on the outer surfaces of the side flaps. Holes are formed at the left and right ends of the bent parts of the end walls and the end flaps.

In the packaging box of the present invention, holes are formed at the ends of the folded sections between the end walls and end flaps. This prevents deformation of the corners of the box body even if a large load is placed on the end flaps when the insertion pieces of the end flaps are inserted into the connecting holes of the side flaps. This prevents damage to the corners of the box body when assembling the lid.

If the insertion piece is inserted far enough into the connecting hole to increase the connecting force between the end flap and the side flap, a large load will be placed on the end flap when the insertion piece is inserted into the connecting hole. Even in such cases, the packaging box of the present invention can prevent deformation of the corners of the box body when the insertion piece is inserted into the connecting hole, thereby preventing damage to the box body and increasing the strength of the lid.

Furthermore, if the lid is attached to the opening on the bottom of the box, water generated from food or ice packs stored inside the box can be drained to the outside through holes in the bottom of the box.

In the packaging box described above, it is preferable that another folding line extending in the left-right direction is formed on the inner surface of the end flap.
In this way, when inserting the insertion piece of the end flap into the connecting hole of the side flap, the end flap can be folded in a mountain fold at the fold line, so that the insertion piece can be positioned closer to the base end than the connecting hole. Then, while stretching the end flap flat, the insertion piece can be easily inserted into the connecting hole.

In the above-mentioned packaging box, an inclined wall may be formed between the adjacent end walls and side walls, thereby forming the body into a polygonal cylindrical shape such as a pentagon, hexagon, or octagon.

In the packaging box of the present invention, holes are formed at the ends of the folded sections between the end walls and end flaps, preventing damage to the box body when the insertion pieces of the end flaps are inserted from the outside into the connecting holes in the side flaps to assemble the lid.

1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the front upper right. 1 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention; 1 is a perspective view of a packaging box according to an embodiment of the present invention in an upside-down state. 10 is a bottom view showing a connection state between an insertion piece and a connection hole of the packaging box according to the embodiment of the present invention. FIG. 1 is a perspective view showing a step of assembling the bottom of the packaging box according to the embodiment of the present invention. FIG. FIG. 10 is a diagram showing a packaging box according to another embodiment of the present invention, which is a blank sheet having an octagonal body. FIG. 10 is a diagram showing a packaging box according to a reference example of the present invention, which is a blank sheet having a configuration in which recesses are formed in the side edges of the end flaps. FIG. 10 is a diagram showing a packaging box according to a reference example of the present invention, which is a blank sheet having slits formed in the side edges of the end flaps.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In the following description, the front, rear, left and right directions are set for the convenience of describing the packaging box of this embodiment, and do not limit the configuration or usage state of the packaging box.

As shown in FIG. 1, the packaging box 1 of this embodiment comprises a box body 50 having a cylindrical body 10, an upper lid 20 provided at the upper opening of the body 10, and a lower lid 30 provided at the lower opening of the body 10.

The packaging box 1 of this embodiment is formed by mountain-folding or valley-folding a blank sheet S (see FIG. 2) cut out from a cardboard sheet along each fold line. The blank sheet S shown in FIG. 2 is positioned so that the inner side is visible.
The fold lines of the blank sheet S are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S. Note that intermittent slits may also be formed in the creases, which makes it easier to fold the blank sheet S at the crease lines.
Alternatively, the folded line may be formed by forming a half-cut slit only on the surface of the sheet or by forming an intermittent slit that penetrates the sheet.

As shown in Figure 1, the body 10 has a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12. The end wall 11 and side wall 12 are formed in a rectangular shape. The end wall 11 and side wall 12 are connected via a folding line. In this embodiment, the cylindrical body 10 is formed by attaching a joining piece 13 connected to the rear edge of the right side wall 12 to the inner surface of the rear end wall 11. Rectangular openings are formed on the top and bottom surfaces of the body 10.

The upper cover portion 20 has a pair of front and rear first flaps 21, 21 connected to the front and rear end walls 11, 11 respectively, and left and right second flaps 22, 22 connected to the pair of left and right side walls 12, 12 respectively.
In the top lid part 20 of this embodiment, one end of the first flap 21 is overlapped on the top surface of the second flap 22, and the other end of the first flap 21 is overlapped on the bottom surface of the second flap 22. In addition, in the top lid part 20, one end of the second flap 22 is overlapped on the top surface of the first flap 21, and the other end of the second flap 22 is overlapped on the bottom surface of the first flap 21.
In this manner, the first flaps 21 and the second flaps 22 of the upper cover portion 20 of this embodiment are assembled into a windmill assembly, and an opening is formed in the center of the upper cover portion 20.

As shown in Figure 3, the lower cover 30 includes a pair of front and rear end flaps 31, 31 connected to the lower edges of the front and rear end walls 11, 11, respectively, and a pair of left and right side flaps 32, 32 connected to the lower edges of the left and right side walls 12, 12, respectively.

The left side flap 32 is connected to the lower edge of the left side wall 12 via a fold line, and the right side flap 32 is connected to the lower edge of the right side wall 12 via a fold line.
The left side flap 32 closes the left half of the opening at the bottom of the body 10, and the right side flap 32 closes the right half of the opening at the bottom of the body 10. The left and right side flaps 32, 32 are butted against each other in the center of the body 10 in the left-right direction.

As shown in Figure 5, the left side flap 32 has two connecting holes 60, 60 at the front and rear, and a cover plate 65 that closes the connecting holes 60.

The left front connecting hole 60 formed in the front part of the left side flap 32 extends to the right from the lower edge of the left side wall 12 and also extends rearward from the end on the inner side in the left-right direction (towards the center of the lower cover portion 30).
At the edge of the left front connecting hole 60, the front part of the inner edge in the left-right direction is inclined inward in the left-right direction as it extends rearward (see FIG. 4).

The left front connecting hole 60 is closed by a cover plate 65. A portion of the edge of the cover plate 65 is connected to the front of the inner edge in the left-right direction at the edge of the left front connecting hole 60 via a fold line L1. In addition, another portion of the edge of the cover plate 65 is connected to the edge of the connecting hole 60 via a slit.

The left rear connecting hole 60 and cover plate 65 formed at the rear of the left side flap 32 are formed symmetrically in the front-to-rear direction with respect to the left front connecting hole 60 and cover plate 65 (see FIG. 4).
The right and left side flaps 32 are formed symmetrically (see FIG. 4). The right side flap 32 also has a connecting hole 60 and a cover plate 65 formed therein.

As shown in Figure 3, the front end flap 31 is connected to the lower edge of the front end wall 11 via a fold line. The front end flap 31 overlaps the outer surfaces (lower surfaces) of the front portions of the left and right side flaps 32, 32.

The tip of the end flap 31 is formed with two left and right insertion pieces 71, 71, and a protruding piece 72 located between the two insertion pieces 71, 71. As shown in Figure 4, the protruding piece 72 is formed between two left and right recesses 73, 73 formed on the tip edge of the end flap 31 (see Figure 2).

The leading edges of both insertion pieces 71, 71 and the leading edge of the protruding piece 72 are parallel to the lower edge of the end wall 11. The leading edges of both insertion pieces 71, 71 and the leading edge of the protruding piece 72 are aligned in a straight line in the left-right direction (see Figure 2).

3, the insertion pieces 71 are inserted into the connecting holes 60 of the side flaps 32, respectively. The cover plate 65 is pressed inward by the insertion pieces 71 and is inclined inward relative to the side flaps 32 at the fold line L1.
The protruding piece 72 is overlapped on the outer surfaces (lower surfaces) of the left and right side flaps 32. Specifically, the protruding piece 72 is overlapped on the outer surfaces of the side flaps 32, 32 across the butt joints between the side flaps 32, 32.

As shown in Figure 2, a fold line L10 extending in the left-right direction is formed in the middle of the inner surface of the end flap 31 in the front-to-rear direction (see Figure 4). The fold line L10 is parallel to the base end edge of the end flap 31 (the lower edge of the end wall 11).

As shown in FIG. 3 , holes 80 are formed in the four lower corners 51 of the box body 50 of this embodiment. The corners 51 are formed by the end wall 11, the side wall 12, the end flap 31, and the side flaps 32. The holes 80 penetrate the corners 51 of the box body 50.

The hole 80 is formed at the intersection of the fold line between the end wall 11 and the side wall 12, the fold line between the end wall 11 and the end flap 31, and the fold line between the side wall 12 and the side flap 32 in the blank sheet S shown in Figure 2.

The hole 80 is formed in a substantially circular shape in the blank sheet S. In this embodiment, the hole 80 is formed in parts in the end wall 11, the side wall 12, the end flap 31, and the side flap 32. In other words, the end wall 11, the side wall 12, the end flap 31, and the side flap 32 each have an area that occupies approximately one-quarter of the edge of the hole 80.
As shown in Figure 3, when the box body 50 is assembled, the edges of the hole 80 in the end wall 11, side wall 12, end flap 31 and side flap 32 are connected to form the hole 80 in the corner 51 of the box body 50.

When assembling the bottom lid portion 30 of the packaging box 1 of this embodiment, first, the left and right side flaps 32, 32 are closed as shown in FIG.
Next, the end flap 31 is folded along the fold line L10 so as to form a mountain fold when viewed from the outside. In this way, the left and right insertion pieces 71, 71 of the end flap 31 are positioned closer to the base end of the end flap 31 than the left and right connecting holes 60, 60 of the left and right side flaps 32, 32.

3, while flattening the end flap 31, the left and right insertion pieces 71, 71 are inserted into the left and right connecting holes 60, 60. The protruding piece 72 straddles the butt joints of the left and right side flaps 32, 32 and is placed on the outer surfaces of the both side flaps 32, 32.
In this manner, the lower cover portion 30 is formed by assembling the front and rear end flaps 31, 31 to the left and right side flaps 32, 32.

4, the packaging box 1 is configured so that the insertion pieces 71 of the end flaps 31 are inserted largely into the connecting holes 60 of the side flaps 32. In this way, when the insertion pieces 71 are inserted into the connecting holes 60, the end flaps 31 are significantly deformed, and a large load is applied to the end flaps 31.
In the packaging box 1 of this embodiment, holes 80, 80 are formed at both the left and right ends of the folded portion between the end wall 11 and the end flap 31. As a result, even if a large load is applied to the end flap 31 when the insertion piece 71 is inserted into the connecting hole 60, deformation of the corner 51 of the box body 50 can be suppressed.
Therefore, in the packaging box 1 of this embodiment, damage to the box body 50 when assembling the lower lid portion 30 can be prevented while the strength of the lower lid portion 30 can be increased by inserting the insertion piece 71 deeply into the connecting hole 60 and increasing the connecting force between the end flap 31 and the side flap 32.

In the packaging box 1 of this embodiment, as shown in Figure 5, when inserting the insertion piece 71 of the end flap 31 into the connecting hole 60 of the side flap 32, the end flap 31 can be folded in a mountain fold at the fold line L10, so that the insertion piece 71 is positioned closer to the base end than the connecting hole 60. Then, while flattening the end flap 31, the insertion piece 71 can be easily inserted into the connecting hole 60.

In the packaging box 1 of this embodiment, water generated from food products and ice packs stored inside the box body 50 shown in Figure 1 can be drained to the outside through the holes 80 formed in the bottom of the box body 50.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention.
In the packaging box 1 of this embodiment, as shown in Fig. 3, the lid configuration of the present invention is applied to the lower lid 30, but the lid configuration of the present invention may also be applied to the upper lid 20. In this case, a hole 80 is formed in the upper corner 51 of the box body 50. Furthermore, the lid configuration of the present invention may be applied to both the upper lid 20 and the lower lid 30.

In the packaging box 1 of this embodiment, as shown in Figure 1, the body 10 is formed in a rectangular cylindrical shape, but inclined walls may be formed between adjacent end walls 11 and side walls 12 to form the body 10 in a pentagonal, hexagonal, or octagonal cylindrical shape. The blank sheet S1 shown in Figure 6 has four inclined walls 15 formed on it, and a packaging box with an octagonal cylindrical body can be formed from this blank sheet S1.

Furthermore, the shape and size of the insertion piece 71 and the connecting hole 60 are not limited, and may be appropriately formed taking into consideration the ease of assembly of the insertion piece 71 and the connecting hole 60 and the difficulty of them coming off.
For example, as in the reference example blank sheet S2 shown in Figure 7, a recess 75 may be formed on the side edge of the insertion piece 71 of the end flap 31, so that when the insertion piece 71 is inserted into the connecting hole 60, the recess 75 will catch on the edge of the connecting hole 60.
In addition, as in the reference example blank sheet S3 shown in Figure 8, a slit 76 may be formed on the side edge of the insertion piece 71 of the end flap 31 so that when the insertion piece 71 is inserted into the connecting hole 60, the slit 76 will catch on the edge of the connecting hole 60.

In the packaging box 1 of this embodiment, as shown in FIG. 1, the first flaps 21 and second flaps are alternately stacked, but the configuration of the top lid portion 20 is not limited thereto. For example, the pair of flaps may be butted together and closed, thereby blocking the upper opening of the box body 50 with the top lid portion 20. Furthermore, the box body 50 may be formed in the shape of a tray with an open top surface, without providing the top lid portion 20 on the box body 50.

The packaging box 1 of this embodiment is made of corrugated cardboard, but the packaging box of the present invention can also be made from various known paperboards.

REFERENCE SIGNS LIST 1 Packaging box 10 Body 11 End wall 12 Side wall 13 Joint piece 15 Inclined wall 20 Top lid portion 21 First flap 22 Second flap 30 Bottom lid portion 31 End flap 32 Side flap 50 Box body 51 Corner portion 60 Connecting hole 65 Lid plate 71 Insertion piece 72 Protruding piece 73 Recess 75 Depression portion 76 Slit 80 Hole portion L10 Fold line S Blank sheet S1 Blank sheet (other embodiments)
S2 Blank sheet ( reference example )
S3 Blank sheet ( reference example )

Claims (4)

a cylindrical body portion having front and rear end walls and left and right side walls;
a lid portion provided at an opening in the vertical direction of the body portion,
The lid portion is
an end flap connected to the end wall;
left and right side flaps connected to the side walls, respectively;
the end flaps overlap the outer surfaces of the side flaps;
The side flaps are each formed with a connecting hole,
The connecting hole is closed by a cover plate,
An inclined portion is formed on an outer portion of an inner edge of the connecting hole in the front-rear direction, the inclined portion inclining inward in the front-rear direction as it goes inward in the front-rear direction,
a portion of the edge of the cover plate is connected to the inclined portion of the edge of the connecting hole via a bent line, and another portion of the edge of the cover plate is connected to the edge of the connecting hole via a slit,
The end flap has left and right insertion pieces and a protruding piece disposed between the insertion pieces at its tip,
The two insertion pieces are inserted into the two connecting holes, respectively,
The protruding pieces are superimposed on the outer surfaces of the side flaps,
A packaging box characterized in that holes are formed at the left and right ends of the folded portions of the end walls and the end flaps. The packaging box according to claim 1,
The packaging box is characterized in that the lid portion is provided at an opening on the lower side of the box body. The packaging box according to claim 1,
A packaging box characterized in that another fold line extending in the left-right direction is formed on the inner surface of the end flap. The packaging box according to claim 1,
A packaging box characterized in that an inclined wall is formed between the adjacent end wall and side wall.