JP7392699B2 - packaging box - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act On September 9, 2021, the packaging box related to the invention was sold to the agricultural cooperative corporation C-TECH Hosoiri.

The present invention relates to packaging boxes.

For the bottom plate of a cardboard packaging box, overlap the front and rear end flaps on the underside of the left and right side flaps, and insert the tips of the end flaps into the connecting holes formed at the butts of both side flaps. (For example, see Patent Document 1).

Patent No. 3912537

In the above-mentioned conventional packaging box, it is desired to increase the strength of the bottom plate by making it difficult for the tips of the end flaps to slip out from the connection ports formed at the abutting portions of the side flaps.

An object of the present invention is to provide a packaging box that can increase the strength of the bottom plate by easily and reliably connecting each flap of the bottom plate.

In order to solve the above-mentioned problems, the present invention provides a packaging box, which includes a body section formed into a cylindrical shape by a pair of front and rear end walls and a pair of left and right side walls, and a box provided in an opening on the lower side of the body section. It is equipped with a bottom plate. The bottom plate includes a pair of left and right side flaps each connected to a lower edge of the both side walls, and an end flap connected to a lower edge of the end wall and overlapped with a lower surface of the both side flaps. It has . A connecting port is formed in the abutting portions of the side flaps, and a lid plate is connected to an edge of the connecting port on the side opposite to the center in the front-rear direction of the bottom plate. The end flap includes a flap body extending in the front-rear direction from the lower edge of the end wall, a locking part protruding in the left-right direction from the tip of the flap body, and an edge of the flap body and the A notch is formed extending from the apex of the corner formed by the edge of the locking portion toward the distal end side of the end flap. The cut is a linear slit cut into the end flap without any gap. The tip of the notch is bent toward the opposite side of the center in the left-right direction on the bottom plate. The tip of the end flap is inserted into the connection port, and the locking portion is overlapped with the upper surface of the side flap. The edge of the cover plate is configured to be sandwiched between the tip of the notch.

When assembling the bottom plate of the packaging box of the present invention, the end flaps are stacked on the lower surfaces of the left and right side flaps, and the end flaps are used to push the both side flaps into the inside of the body, thereby opening the connecting openings at the abutting parts on the left and right sides. Insert the tip of the end flap into the connection port while spreading it in the direction of the connector. Thereby, the tip of the end flap can be easily inserted into the connection port, and the locking portion can be locked on the upper surface of the side flap.

Furthermore, in the packaging box of the present invention, the edge of the lid plate is inserted into the notch of the end flap, making it difficult for the tip of the end flap to come out of the connection opening, thereby increasing the strength of the bottom plate.
Further, since the notch is a slit cut into the end flap without any gap, the edge of the lid plate is strongly caught in the notch.

Moreover, since the tip of the notch is bent toward the opposite side of the center in the left-right direction on the bottom plate, the edge of the lid plate can be deeply inserted into the notch.

It is preferable that a first area of the connection port on the center side of the bottom plate in the front-rear direction is opened, and a second area of the connection port on the opposite side of the center side of the bottom plate in the front-rear direction is closed by the lid plate.
In this configuration, since the entire connecting port is not covered by the cover plate, it becomes easier to insert the tip of the end flap into the connecting port. Furthermore, since a portion of the connection port is covered by the lid plate, it is difficult for dust to enter the packaging box through the connection port.
It is preferable that an edge of the lid plate on the center side in the front-rear direction of the bottom plate is inclined toward the center side in the front-rear direction of the bottom plate as it goes from the inner end in the left-right direction to the outer end in the left-right direction.

Further, by forming a region in the first region of the connection port, the width of which becomes smaller in the left-right direction toward the center of the bottom plate in the front-rear direction, the locking portion is made difficult to come off from the connection port. is preferred.

In the above-mentioned packaging box, when the lid plate is connected to the edge of the connection port via a fold line, when the tip of the end flap is inserted into the connection port, the cover plate will not fit on the fold line of the packaging box. Since it is bent inward, it becomes easier to insert the tip of the end flap into the connection port.

In the above-mentioned packaging box, it is preferable that the fold line is inclined toward the center of the bottom plate in the front-rear direction as it goes from the inner end in the left-right direction to the outer end.
With this configuration, when the tip of the end flap is inserted into the connection port, the lid plate bends toward the inside of the packaging box while tilting outward in the left-right direction along the fold line, and the connection port opens wide. Easy to insert the tip into the connection port.

In the packaging box of the present invention, the bottom plate can be assembled by easily connecting the end flaps and the side flaps, and by inserting the edge of the lid plate inside the connection opening into the notch of the end flap, the bottom plate can be easily assembled. can increase the strength of

FIG. 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the front lower left. It is a figure showing a blank sheet of a packaging box concerning an embodiment of the present invention. FIG. 2 is a perspective view of the packaging box according to the embodiment of the present invention, with left and right side flaps closed, viewed from the front lower left. FIG. 2 is a cross-sectional view of the front part of the bottom plate of the packaging box according to the embodiment of the present invention, viewed from above.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the following description, the front, rear, left, and right directions are set for convenience in explaining the packaging box of this embodiment, and do not limit the configuration or use condition of the packaging box.

As shown in FIG. 1, the packaging box 1 of this embodiment includes a body 10 formed in a rectangular tube shape, a top plate 20 provided at the upper opening of the body 10, and a lower side of the body 10. and a bottom plate 30 provided in the opening of.

As shown in FIG. 2, the packaging box 1 of this embodiment is formed by mountain-folding or valley-folding a blank sheet S obtained by cutting out a cardboard sheet along each fold line. The blank sheet S shown in FIG. 2 is arranged so that the inner surface side is visible.
The fold line of the blank sheet S is a ruled line (pressed line) formed by pressing the surface of the blank sheet S into a linear shape. Note that intermittent cuts may be formed in the ruled lines. This makes it easier to fold the blank sheet S along the fold line.
Alternatively, the folded line may be formed by intermittent half-cut slits that cut only the surface of the sheet or slits that penetrate through the sheet to form a linear shape.

As shown in FIG. 1, the body portion 10 includes a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12. The front and rear end walls 11, 11 and the left and right side walls 12, 12 are formed into a square shape.
In this embodiment, a strip-shaped joint piece 13 is continuously provided at the rear edge of the left side wall 12 (see FIG. 2). The joining piece 13 is attached to the inner surface of the rear end wall 11.

When the blank sheet S (see FIG. 2) is bent along each ruled line and the joining piece 13 is joined to the inner surface of the rear end wall 11, the front and rear end walls 11, 11 and the left and right side walls 12, 12 form a rectangular shape in plan view. A cylindrical body portion 10 is formed.

As shown in FIG. 2, the top plate 20 includes a pair of front and rear first flaps 21, 21 connected to the upper edges of the front and rear end walls 11, 11, respectively, and the upper edges of the left and right side walls 12, 12. It is provided with a pair of left and right second flaps 22, 22 which are arranged in series, respectively. The top plate 20 is formed by arranging the first flaps 21, 21 and the second flaps 22, 22 inside the upper opening of the body 10.
Although the top plate 20 of this embodiment closes the outer circumference of the upper opening of the body 10, the first flaps 21, 21 and both second flaps 22, 22 close the upper opening of the body 10. The entire section may be occluded.

As shown in FIG. 1, the bottom plate 30 includes a pair of left and right side flaps 40, 40 connected to the lower edges of the left and right side walls 12, 12, respectively, and a pair of left and right side flaps 40, 40 connected to the lower edges of the front and rear end walls 11, 11. A pair of front and rear end flaps 50, 50 are provided, which are connected to each other.

The left side flap 40 covers the left half of the lower opening of the trunk 10, as shown in FIG. The right side flap 40 covers the right half of the lower opening of the trunk 10.
The tip edges of the left and right side flaps 40, 40 are butted against each other at the center of the lower opening of the body 10 in the left-right direction. The lower opening of the trunk 10 is closed by the side flaps 40, 40.

Front and rear connecting ports 41, 41 are formed at the abutting portions of the side flaps 40, 40 at intervals in the front-rear direction. Note that the abutting portions of the side flaps 40, 40 are formed by the tip portions of the side flaps 40, 40, and are band-shaped regions extending in the front-rear direction at the center portion of the bottom plate 30 in the left-right direction.

The front connection port 41 is arranged on the front side of the center of the bottom plate 30 in the front-rear direction. As shown in FIG. 4, the left half of the connection port 41 is formed in the left side flap 40, and the right half of the connection port 41 is formed in the right side flap 40. The connecting port 41 is a portion that becomes one opening when the side flaps 40, 40 are butted together.
The front and rear edges of the connection port 41 extend in the left-right direction, and the left and right edges of the connection port 41 extend in the front-rear direction.

A first region 42 on the front side (center side of the bottom plate 30 in the front-rear direction) of the front connection port 41 is open. Further, a second region 43 on the rear side (the side opposite to the center side of the bottom plate 30 in the front-rear direction) of the front connection port 41 is closed by the left and right cover plates 60, 60.

A recessed portion 44 projecting rearward is formed in the center of the rear edge of the front connecting port 41 . The recessed portion 44 has a width that decreases in the left-right direction toward the rear, and is formed in a triangular shape when viewed from above.
In this way, the first region 42 of the front connecting port 41 is formed with a portion (a recessed portion 44) whose width in the left-right direction decreases toward the rear (towards the center of the bottom plate 30 in the front-rear direction). There is.

The front edges of the left and right halves of the front connection port 41 (edges on the side opposite to the center side of the bottom plate 30 in the front-rear direction) extend rearward (edges on the side opposite to the center side of the bottom plate 30 in the front-rear direction) as they move from the inner end to the outer end. (center side in the front-rear direction). In other words, the front edge of the front communication port 41 has a central portion in the left-right direction recessed toward the opposite side from the center in the front-rear direction of the bottom plate 30 .

The left cover plate 60 closes the left half of the second region 43 of the front connection port 41. Further, the right cover plate 60 closes off the left half of the second region 43 of the front connection port 41.
The outer edge of the cover plate 60 in the left-right direction is separated from the edge of the connection port 41. Further, the inner edge of the cover plate 60 in the left-right direction is separated from the edges of the other cover plates 60.

The front edge of the lid plate 60 is connected to the front edge of the connection port 41 via a fold line L1. Similarly to the front edge of the front connection port 41, the fold line L1 is inclined toward the center of the bottom plate 30 from the inner end to the outer end in the left-right direction.
The rear edge of the lid plate 60 is inclined toward the center of the bottom plate 30 from the inner end to the outer end in the left-right direction.

As shown in FIG. 3, the rear connecting port 41 is arranged on the rear side of the center of the bottom plate 30 in the front-rear direction. The rear connecting port 41 is formed symmetrically with respect to the front connecting port 41. The first area 42 on the rear side of the connection port 41 on the rear side is open, and the second area 43 on the front side is closed by the left and right cover plates 60, 60.

The front end flap 50 is overlapped with the front lower surface of the side flaps 40, 40, as shown in FIG.
As shown in FIG. 4, the front end flap 50 includes a flap main body 51 that extends from the lower edge of the front end wall 11 toward the rear (towards the center of the bottom plate 30 in the front-rear direction), and Left and right locking portions 52, 52 are formed that protrude from the tip (rear end) of the main body 51 on both the left and right sides.

The flap main body 51 of the front end flap 50 has a proximal end (front end) connected to the end wall 11 having a constant width in the left-right direction, and a width extending from the proximal end to the distal end (rear end). The width in the left and right direction becomes smaller as you move towards the area.
The width of the front end of the flap body 51 in the left-right direction is the same as or slightly smaller than the width of the front connecting port 41 in the left-right direction.
The tip of the flap body 51 is inserted into the front connecting port 41 from below (see FIG. 1). The distal end portion of the flap main body 51 is overlapped on the upper surface of the side flaps 40, 40 behind the front connecting port 41.

The left and right locking portions 52, 52 are portions that protrude from the tip of the flap body 51 in the left-right direction. Both the locking portions 52, 52 are stacked on the upper surface of the side flap 40 on the outer side in the left-right direction than the front connecting port 41.

In this way, the tip of the flap main body 51 and the left and right locking portions 52, 52 overlap the upper surfaces of the side flaps 40, 40 around the connection port 41, so that the tip of the end flap 50 is attached to both sides. It is locked to the upper surface of the flaps 40, 40.

The front end flap 50 has left and right notches L10 extending from the apex of the corner toward the tip side (rearward) by the left and right edges of the flap body 51 and the rear edge of the locking part 52, L10 is formed (see FIG. 3). The cut L10 is a linear slit cut into the end flap 50 without a gap, and is formed at the boundary between the flap main body 51 and the locking part 52.

A tip L11 of the notch L10 is bent toward the opposite side (outside) from the center in the left-right direction in the bottom plate 30.

When the end flap 50 is inserted into the connection port 41, the outer edge of the cover plate 60 in the left-right direction is inserted into the notch L10. The inner edge of the locking portion 52 in the left-right direction overlaps the upper surface of the lid plate 60. In this way, the edge of the cover plate 60 of the side flap 40 is sandwiched between the notch L10 of the end flap 50.

As shown in FIG. 1, the rear end flap 50 is formed to be symmetrical with respect to the front end flap 50, and is overlapped with the rear lower surfaces of the both side flaps 40, 40. The tip of the rear end flap 50 is inserted into the rear connecting port 41.

Next, a procedure for assembling the bottom plate 30 of the packaging box 1 will be explained.
First, as shown in FIG. 3, the left and right side flaps 40, 40 are bent inside the trunk 10 with respect to the left and right side walls 12, 12.
Subsequently, as shown in FIG. 1, the front and rear end flaps 50, 50 are bent inward of the trunk 10 against the front and rear end walls 11, 11, and both end flaps 50, 50 are folded into both side flaps 40, 50. Lay it on the bottom of 40. Thereby, the tip of the end flap 50 is disposed below the connecting port 41 of the both side flaps 40, 40.

When the tips of the end flaps 50, 50 are pushed toward the inside of the trunk 10, the end flaps 50, 50 push the end flaps 40, 40 inside the trunk 10 and tilt them. As a result, the tip edges of the side flaps 40, 40 are separated from each other, and the connecting port 41 is widened in the left-right direction.
Then, the tip of the end flap 50 is inserted into the connection port 41, and the tip of the flap main body 51 and both locking portions 52, 52 enter the upper surfaces of the side flaps 40, 40.

When the side flaps 40, 40 are returned flat, the tip of the flap main body 51 and both locking portions 52, 52 overlap the upper surfaces of the side flaps 40, 40. Thereby, the tip portions of the end flaps 50 are locked to the upper surfaces of the side flaps 40, 40.

In this way, the bottom plate 30 is formed in the lower opening of the body section 10 by locking the tips of the front and rear end flaps 50, 50 with the left and right side flaps 40, 40.

In the packaging box 1 as described above, as shown in FIG. The tip of the end flap 50 can be easily inserted into the connection port 41 while unfolding.

Furthermore, in the packaging box 1 of this embodiment, since the entire connection port 41 is not covered by the lid plate 60, it is easy to insert the tip of the end flap 50 into the connection port 41. Note that since a portion of the connection port 41 is covered by the cover plate 60, dust is difficult to enter into the packaging box 1 through the connection port 41.

Furthermore, in the packaging box 1 of this embodiment, when the tip of the end flap 50 is inserted into the connection port 41, the lid plate 60 bends inward of the packaging box 1 while tilting outward in the left-right direction at the bending line L1. . As a result, the connection port 41 opens wide, making it easy to insert the tip of the end flap 50 into the connection port 41.

In this way, in the packaging box 1 of the present embodiment, the bottom plate 30 can be easily assembled without using adhesive tape or adhesive, so that the work efficiency when assembling the bottom plate 30 can be improved.

In the packaging box 1 of this embodiment, as shown in FIG. 4, a recessed portion 44 is formed in the first region 42 of the connecting port 41 so that the width in the left-right direction becomes smaller.
Note that if the connecting port 41 is made larger, it becomes easier to insert the tip of the end flap 50, but if the width of the connecting port 41 in the left-right direction is made too large, it becomes difficult for the locking portion 52 to be caught. Therefore, if the recess 44 is formed in the connection port 41, the connection port 41 will become larger, making it easier to insert the tip of the end flap 50 into the connection port 41. Since the overlapping area between 50 and the side flap 40 becomes large, it becomes difficult for the locking part 52 to come off.

Furthermore, in the packaging box 1 of this embodiment, the edge of the lid plate 60 inside the connection port 41 is inserted into the notch L10 of the end flap 50, so that the tip of the end flap 50 is difficult to come out from the connection port 41. Become.

Moreover, in the packaging box 1 of this embodiment, since the tip L11 of the notch L10 is bent outward in the left-right direction, the edge of the lid plate 60 deeply penetrates into the notch L10.
Furthermore, since the notch L10 of the packaging box 1 of this embodiment is a slit with no gap, the edge of the lid plate 60 is strongly pinched into the notch L10.

In this way, in the packaging box 1 of the present embodiment, the end flaps 50 and the side flaps 40 can be reliably connected, and the strength of the bottom plate 30 can be increased.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit thereof.
In the packaging box 1 of this embodiment, as shown in FIG. 4, the notch L10 formed in the end flap 50 is a slit with no gap, but as a reference example of the present invention, the shape of the notch is limited. Instead, for example, a notch with a gap may be formed by recessing the corner between the edge of the flap body 51 and the edge of the locking part 52 from the apex toward the tip side.

In the packaging box 1 of this embodiment, the tip L11 of the notch L10 is bent toward the outside, but the notch L10 as a whole may be curved. Further, as a reference example of the present invention, the entire notch L10 may be formed in a straight line.

In the packaging box 1 of this embodiment, as shown in FIG. 1, the bottom plate 30 is provided with a pair of front and rear end flaps 50, 50. 40, 40 may be provided with only one of the front and rear connection ports 41.

Although the packaging box 1 of this embodiment has a body 10 formed in a rectangular cylindrical shape, the number of corners of the body 10 is not limited. For example, an inclined wall may be provided between the end wall 11 and the side wall 12, and the body portion 10 may be formed into a hexagonal or octagonal cylindrical shape.

Although the packaging box 1 of this embodiment is provided with the top plate 20, the top plate 20 may not be provided and the top plate 10 may be formed into a tray shape with an open upper opening.

Although the packaging box 1 of this embodiment is made of cardboard, the packaging box of the present invention can be made of various known paperboards.

1 Packaging box 10 Body 11 End wall 12 Side wall 13 Joint piece 20 Top plate 21 First flap 22 Second flap 30 Bottom plate 40 Side flap 41 Connection port 42 First area 43 Second area 44 Recess 50 End flap 51 Flap Main body 52 Locking part 60 Lid plate L1 Broken line L10 Notch L11 Tip S Blank sheet

Claims (6)

a body formed into a cylindrical shape by a pair of front and rear end walls and a pair of left and right side walls;
a bottom plate provided in the lower opening of the body,
The bottom plate is
a pair of left and right side flaps connected to the lower edges of the both side walls;
an end flap connected to a lower edge of the end wall and overlapped with a lower surface of the both side flaps;
A connecting port is formed in the abutting portions of the side flaps,
A lid plate is connected to an edge of the connecting port opposite to the center side in the front-rear direction of the bottom plate,
The end flap includes:
a flap body extending in the front-rear direction from the lower edge of the end wall;
a locking portion protruding from the tip of the flap body in the left-right direction;
A notch is formed extending from the apex of the corner formed by the edge of the flap main body and the edge of the locking portion toward the distal end side of the end flap,
The notch is a linear slit cut into the end flap without any gap,
The tip of the notch is bent toward the opposite side of the center in the left-right direction on the bottom plate,
The tip of the end flap is inserted into the connection port,
The locking portion is overlapped on the upper surface of the side flap,
A packaging box characterized in that the edge of the lid plate is sandwiched between the tip of the notch. The packaging box according to claim 1,
A first region of the connecting port on the center side in the front-rear direction of the bottom plate is open;
A packaging box characterized in that a second region of the connection opening on the opposite side to the center side of the bottom plate in the front-rear direction is closed by the lid plate. The packaging box according to claim 1 or claim 2,
An edge of the lid plate on the center side in the front-rear direction of the bottom plate is inclined toward the center side in the front-rear direction of the bottom plate as it goes from the inner end in the left-right direction to the outer end in the left-right direction. packaging box. The packaging box according to claim 2 ,
The packaging box is characterized in that the first region of the connection opening is formed with a region whose width in the left-right direction decreases toward the center of the bottom plate in the front-rear direction. The packaging box according to any one of claims 1 to 4,
The packaging box is characterized in that the lid plate is connected to the edge of the connection port via a fold line. The packaging box according to claim 5,
The packaging box is characterized in that the fold line is inclined toward the center of the bottom plate in the front-rear direction as it goes from the inner end to the outer end in the left-right direction.

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