JP3234704U - Packaging box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging box provided with a one-touch type bottom which is simple and easy to assemble, whose bottom pieces are firmly connected to each other, and whose strength of the bottom can be remarkably improved.
A first glued area 54 is overlapped with an outer surface of a second bottom piece 66 and joined with glue, and a portion of the second bottom piece 66 that does not overlap with the first glued area 54 is an inner surface of a third trapezoidal area 74. Overlaps on. The third glued region 76 overlaps the outer surface of the fourth bottom piece 88 and is joined by glue, and the portion of the fourth bottom piece 88 that does not overlap with the third glued region 76 overlaps the inner surface of the first trapezoidal region 52. The first one end side protrusion 58 enters the inner surface side of the fourth bottom piece 88, and the first one end side notch 58a engages with the fourth notch 88a, so that the first and fourth bottom pieces 46, 88 are formed. To be connected to each other. The third end side protrusion 80 enters the inner surface side of the second bottom piece 66, and the third end side notch 80a engages with the second notch 66a, so that the second and third bottom pieces 66, 70 are formed. To be connected to each other.
[Selection diagram] Fig. 3

Description

The present invention relates to a packaging box having a one-touch bottom with a locking function.

Conventionally, a cylinder consisting of four side plates and a bottom piece (or bottom plate) extended to each side plate are provided, and when the folded cylinder is made into a three-dimensional quadrangle, the bottom consisting of the four bottom pieces is automatically set. Packaging boxes that can be assembled into are widely used. In recent years, a plurality of techniques for providing a locking function to the bottom have been proposed in order to improve the strength of this type of one-touch type bottom or to prevent a gap from being generated between the bottom pieces.

For example, the one-touch type bottom of the wrapping paper box disclosed in Patent Document 1 has a front bottom plate and a rear bottom plate on which engaging protrusions are extended, respectively, and at the base ends of the two engaging protrusions. Approximately V-shaped engaging cuts are formed, and when the folded cylinder is opened three-dimensionally, the two engaging protrusions are combined with each other by the engaging cuts. The bottom portion is formed by engaging two engaging cuts with each other to form one lock portion, which makes the connection between the front bottom plate and the rear bottom plate stronger and improves the strength of the bottom portion. In addition, if an unauthorized opener tries to forcibly open the bottom, the engagement notch or weakening line will tear and a trace will remain, so it is possible to easily identify whether it is unopened or not, and the effect of preventing unauthorized opening. Can also be obtained.

Further, the one-touch type bottom of the box body disclosed in Patent Document 2 includes two first flaps A1 and A2 arranged in the front-rear direction of the box body and two second flaps arranged in the left-right direction of the box body. It is composed of two flaps B1 and B2, slits are provided on the tip side ends of the first flaps A1 and A2, and fitting edges (and fitting protrusions) are provided on the side end sides of the second flaps B1 and B2, respectively. When the provided and folded cylinder is opened three-dimensionally, the fitting edge of the second flap B1 is fitted into the slit of the first flap A1, and the fitting edge of the second flap B2 is fitted into the slit of the first flap A2. It has a structure that Two lock portions are formed on the bottom portion by fitting the fitting edges of the second flaps B1 and B2 into the slits of the first flaps A1 and A2.

Utility Model Registration No. 30944883 Japanese Unexamined Patent Publication No. 2020-19529

Since the wrapping paper box of Patent Document 1 has one lock portion at the bottom, if the area of the bottom is large, the strength of the bottom may be insufficient. Further, when the width dimension is considerably longer than the depth dimension (when the bottom portion becomes a wide rectangle), a gap is likely to occur between the left and right bottom plates and the front and rear bottom plates.

Since the box body of Patent Document 2 has two lock portions at the bottom, it is advantageous when the area of the bottom is large. However, the structure of the lock part is such that after the fitting edges of the second flaps B1 and B2 enter the slits of the first flaps A1 and A2, the fitting edges are not firmly fixed in the slits and easily slide. Resulting in. Therefore, it is not possible to firmly connect the second flaps B1 and B2 and the first and second flaps B1 and B2, and it is difficult to significantly improve the strength of the bottom.

Further, the box body of Patent Document 2 is located in the front-rear direction because the positions of the two lock portions are separated from each other when the width dimension is considerably longer than the depth dimension (when the bottom becomes a wide rectangle). 1 A gap is likely to occur between the flaps A1 and A2. In order to solve this problem, for example, it is conceivable to add the configuration of the lock portion of Patent Document 1 to the box body of Patent Document 2, but if simply combined, the bottom portion cannot be smoothly assembled with one touch.

The present invention was made in view of the above background technology, and is a packaging box equipped with a one-touch type bottom that is simple and easy to assemble, the bottom pieces are firmly connected to each other, and the strength of the bottom can be remarkably improved. The purpose is to provide.

The present invention has first to fourth side plates that are continuous in the circumferential direction, the first and third side plates facing each other in the front-rear direction, and the second and fourth side plates facing each other in the left-right direction. It has a tubular body to be formed and first to fourth bottom pieces extending from the bottom ends of the first to fourth side plates, respectively, and the first to fourth bottom pieces overlap each other. The bottom is a packaging box that is a one-touch bottom that is assembled by forming the cylinder into a three-dimensional quadrangular shape.
The first bottom piece is a region extended to the end side of the first side plate, and the outer shape is a first trapezoidal region formed in a trapezoidal shape in which the end side in the extending direction is narrowed. On the side of the fourth bottom piece of the first trapezoidal region, the first glued region extending on the oblique side near the second bottom piece, and the end side of the first trapezoidal region in the extending direction. A first auxiliary region extending at an unbalanced position and a first end side protrusion of the first auxiliary region protruding in the direction of the fourth bottom piece from a side side close to the fourth bottom piece. A notch on the first end side is provided at the base end portion of the protrusion on the first end side near the first trapezoidal region.
The second bottom piece is provided with a second notch on the side near the first bottom piece, which is a V-shaped cutout on the side.
The third bottom piece is a region extended to the end side of the third side plate, and the outer shape is a third trapezoidal region formed in a trapezoidal shape in which the end side in the extending direction is narrowed. And, on the side of the second bottom piece of the third trapezoidal region, the third glued region extended on the oblique side near the fourth bottom piece, and the end side of the third trapezoidal region in the extending direction. A third auxiliary region extending at an unbalanced position, and a third end side protrusion protruding from the side of the third auxiliary region near the second bottom piece in the direction of the second bottom piece. The third end side notch is provided at the base end portion of the third end side protrusion near the third trapezoidal region.
The fourth bottom piece is provided with a fourth notch on the side near the third bottom piece, which is a V-shaped cutout on the side.
With the bottom assembled, the first glued area overlaps the outer surface of the second bottom piece and is joined with glue, and the second bottom piece has a portion that does not overlap with the first glued area. The third glued region overlaps the inner surface of the trapezoidal region, and the third glued region overlaps the outer surface of the fourth bottom piece and is joined with glue. Overlapping the inner surface of the region, the first auxiliary region overlaps the inner surface of the third trapezoidal region, the third auxiliary region overlaps the inner surface of the first trapezoidal region, and the first end side protrusion is the first. By entering the inner surface side of the four bottom pieces and engaging the first end side notch with the fourth notch, the first and fourth bottom pieces are connected to each other, and the third end side protrusion Is a packaging box in which the second and third bottom pieces are interconnected by entering the inner surface side of the second bottom piece and engaging the third end side notch with the second notch. ..

The first end side protrusion is provided so as to straddle the side side of the first auxiliary region and the first trapezoidal region near the fourth bottom piece, and the third end side protrusion is the third. It may be provided so as to straddle the side side of the auxiliary region and the third trapezoidal region near the second bottom piece. Further, at the boundary between the first end side protrusion and the first auxiliary region, a first end side folding ruled line is provided to facilitate the operation of assembling the bottom portion, and the third end side protrusion is provided. It is preferable that the boundary portion between the third auxiliary region and the third auxiliary region is provided with a third end side folding ruled line for facilitating the operation of assembling the bottom portion.

Further, the first bottom piece includes a first central side protrusion that protrudes in the direction of the second bottom piece from the side of the first auxiliary region near the second bottom piece, and the first center. A first central side notch is provided at the base end portion of the lateral protrusion portion near the first trapezoidal region, and the third bottom piece is close to the fourth bottom piece of the third auxiliary region. A third central side protrusion is provided that projects from the side side in the direction of the fourth bottom piece, and a third central side notch is provided at the base end portion of the third central side protrusion near the third trapezoidal region. Is provided, and in a state where the bottom portion is assembled, the first central side protrusion enters the inner surface side of the third trapezoidal region, and the third central side protrusion enters the first trapezoidal region. By entering the inner surface side of the film and engaging the first central side notch with the third central side notch, the first and third bottom pieces can be configured to be connected to each other. In this case, at the boundary between the first central side protrusion and the first auxiliary region, first central side fold ruled lines are provided to facilitate the operation of assembling the bottom portion, and the third central side is provided. It is preferable that the boundary portion between the protrusion and the third auxiliary region is provided with a third central side fold ruled line for facilitating the operation of assembling the bottom portion.

The packaging box of the present invention has a one-touch bottom with a unique structure, the first and second bottom pieces are connected by gluing, and the second and third bottom pieces engage with each other's notches ( The feature is that they are connected by (locking), the third and fourth bottom pieces are connected by gluing, and the fourth and first bottom pieces are connected by engaging (locking) the notches with each other. Since the structure is such that the four bottom pieces are connected to each other to the adjacent bottom pieces, the strength of the bottom part can be increased and a gap is unlikely to be formed between the bottom pieces.

In addition, it is possible to easily add a configuration in which the first and third bottom pieces arranged in the front-rear direction are engaged (locked) with each other by the notches, so that the bottom can be assembled as easily as before. While ensuring, the strength of the bottom can be further strengthened.

It is a perspective view (a) which shows the assembled state of one Embodiment of the packaging box of this invention, and is the perspective view (b) which shows the structure of a lid part. It is a bottom view (a) which shows the assembled state of the packaging box of this embodiment, and is a plan view (b) which looked at the bottom part from the inside of a cylinder. It is a top view which looked at the box body forming piece which developed the packaging box of this embodiment from the back surface side. It is a figure (a), (b) which shows the assembly process (the process of folding a box body forming piece) of the packaging box of this embodiment in order. It is a figure (a), (b) which shows the assembly process (the process of folding a box body forming piece) of the packaging box of this embodiment in order. It is a figure which shows the assembly process (the process of forming the bottom part) of the packaging box of this embodiment, and is the figure (a) which looked at the bottom part from the outer surface side, and is the plan view (b) which looked at the bottom part from the inside of a cylinder. .. It is a figure which shows the assembly process (the process of forming the bottom part) of the packaging box of this embodiment, and is the figure (a) which looked at the bottom part from the outer surface side, and is the plan view (b) which looked at the bottom part from the inside of a cylinder. .. It is a bottom view (a) which shows the assembled state of the packaging box of a modification, and is a plan view (b) which saw the bottom part from the inside of a cylinder. It is a top view which looked at the box body forming piece which developed the packaging box of the modified example from the back side.

Hereinafter, an embodiment of the packaging box of the present invention will be described with reference to FIGS. 1 to 7. As shown in FIGS. 1A and 1B, the packaging box 10 of this embodiment is provided with a rectangular parallelepiped body 12, and both ends of the tubular body 12 are closed by a lid portion 14 and a bottom portion 16, respectively. It is a box body of. The bottom portion 16 is a one-touch type bottom portion shown in FIGS. 2 (a) and 2 (b).

The packaging box 10 is formed by assembling a single box body forming piece 18 made of cardboard or the like. As shown in FIG. 3, the box body forming piece 18 has first to fourth side plates 20, 22, 24, 26 which are sequentially connected in a row, and each of them has fold ruled lines 28, 30, 32 parallel to each other. It is separated. The first to fourth side plates 20, 22, 24, 26 have the same length in the width direction orthogonal to the connecting direction, and the lengths in the connecting direction are longer for the first and third side plates 20, 24. They are almost equal to each other, and the second and fourth side plates 22, 26 are short and almost equal to each other. Then, a glue piece 34 is shortly extended to the end edge of the first side plate 20 in the connecting direction, and is separated from the first side plate 20 by a fold ruled line 36. The first to fourth side plates 20, 22, 24, 26 and the gluing piece 34 are members that become the tubular body 12 in the assembled state.

A member forming the lid portion 14 is extended on the upper end side of the first to fourth side plates 20, 22, 24, 26 in FIG. 3, and a bottom portion 16 is formed on the lower end side. Members are extended. Hereinafter, the upper end side of each side plate is referred to as a lid side end side, and the lower end side is referred to as a bottom side end side.

A quadrangular lid piece 38 extends from the end side of the first side plate 20 on the lid side, and is separated from the first side plate 20 by a fold ruled line 40. The length of the lid piece 38 in the extending direction is substantially the same as the length of the second and fourth side plates 22 and 26 in the connecting direction. Further, an insertion piece 42 is shortly extended at the end of the lid piece 38 in the extending direction, and is separated from the lid piece 38 by a fold ruled line 44.

A first bottom piece 46 extends from the bottom edge of the first side plate 20 and is separated from the first side plate 20 by a fold ruled line 50. The first bottom piece 46 is composed of a first trapezoidal region 52, a first gluing region 54, a first auxiliary region 56, a first end side protrusion 58, and a first central side protrusion 60.

The first trapezoidal region 52 is a region extended to the end side of the first side plate 20, and the outer shape is formed in an isosceles trapezoidal shape in which the end side in the extending direction is narrowed, and the first side plate is formed. The extending length from 20 is set to about 1/2 of the connecting direction length (the length in the front-rear direction of the tubular body 12) of the second and fourth side plates 22 and 26. The first gluing region 54 is a substantially triangular region of the first trapezoidal region 52 extending on the hypotenuse near the second side plate 22, and is separated from the first trapezoidal region 52 by a fold ruled line 54a. The first auxiliary region 56 is a substantially quadrangular region extending at a position biased toward the glued piece 34 on the end side of the first trapezoidal region 52 in the extending direction.

The first end side protrusion 58 is a tongue piece-shaped portion of the first auxiliary region 56 that protrudes in the direction of the glue piece 34 from the side side close to the glue piece 34, and is a base end portion close to the first trapezoidal region 52. Is provided with a first end side notch 58a, which is a V-shaped notch at the base end portion. Further, a first end side folding ruled line 58b is provided at the boundary between the first end side protrusion 58 and the first auxiliary region 56.

The first central side protrusion 60 is a tongue-shaped portion of the first auxiliary region 56 that protrudes in the direction of the second side plate 22 from the side side close to the second side plate 22, and is formed in the first trapezoidal region 52. A first central side notch 60a, which is a V-shaped notch at the base end portion, is provided at the near base end portion. Further, a first central side folding ruled line 60b is provided at a boundary portion between the first central side protrusion 60 and the first auxiliary region 56.

A substantially quadrangular side flap 62 extends from the end side of the second side plate 22 on the lid side, and is separated from the second side plate 22 by a fold ruled line 64. The extending length of the side flap 62 is about 1/3 of the length of the first and third side plates 20 and 24 in the connecting direction.

A second bottom piece 66 having a substantially triangular shape extends from the bottom edge of the second side plate 22, and is separated from the second side plate 22 by a fold ruled line 68. The extending length of the second bottom piece 66 is set to be longer than 1/2 of the length in the connecting direction (the length in the front-rear direction of the tubular body 12) of the second and fourth side plates 22 and 26. A second notch 66a is provided at a position in the middle of the side side of the second bottom piece 66 near the first side plate 20 so that the position is cut out in a V shape.

The member constituting the lid portion 14 is not extended to the end side of the third side plate 24 on the lid side. A third bottom piece 70 extends from the bottom edge of the third side plate 24, and is separated from the third side plate 24 by a fold ruled line 72. The third bottom piece 70 has almost the same configuration as the first bottom piece 46, and has a third trapezoidal region 74, a third glued region 76, a third auxiliary region 78, a third end side protrusion 80, and a third central side protrusion. It is composed of a part 82.

The third trapezoidal region 74 is a region extended to the end side of the third side plate 24, and the outer shape is formed in an isosceles trapezoidal shape in which the end side in the extending direction is narrowed, and the third side plate is formed. The extending length from 24 is set to about 1/2 of the connecting direction length (the length in the front-rear direction of the tubular body 12) of the second and fourth side plates 22 and 26. The third glued region 76 is a substantially triangular region of the third trapezoidal region 74 extending on the hypotenuse near the fourth side plate 26, and is separated from the third trapezoidal region 74 by a fold ruled line 76a. The third auxiliary region 78 is a substantially quadrangular region extending at a position biased toward the second side plate 22 at the end side of the third trapezoidal region 74 in the extending direction.

The third end side protrusion 80 is a tongue piece-shaped portion of the third auxiliary region 78 that protrudes in the direction of the second side plate 22 from the side side close to the second side plate 22, and is formed in the third trapezoidal region 74. A third end side notch 80a, which is a V-shaped notch at the base end portion, is provided at the near base end portion. Further, a third end side folding ruled line 80b is provided at the boundary between the third end side protrusion 80a and the third auxiliary region 74.

The third central side protrusion 82 is a tongue-shaped portion of the third auxiliary region 78 that protrudes in the direction of the fourth side plate 26 from the side side close to the fourth side plate 26, and is formed in the third trapezoidal region 74. A third central side notch 82a, which is a V-shaped notch at the base end portion, is provided at the near base end portion. Further, a third central side folding ruled line 82b is provided at the boundary between the third central side protrusion 82 and the third auxiliary region 78.

A substantially quadrangular side flap 84 extends from the end side of the fourth side plate 26 on the lid side, and is separated from the fourth side plate 26 by a fold ruled line 86. The extending length of the side flap 84 is about 1/3 of the length of the first and third side plates 20 and 24 in the connecting direction.

A fourth bottom piece 88 having substantially the same structure as the second bottom piece 66 extends from the bottom end side of the fourth side plate 26, and is separated from the fourth side plate 26 by a fold ruled line 90. The extending length of the fourth bottom piece 88 is set to be longer than 1/2 of the connecting direction length (the length in the front-rear direction of the tubular body 12) of the second and fourth side plates 22 and 26. A fourth notch 88a is provided at a position in the middle of the side of the fourth bottom piece 88 near the third side plate 24, with the position cut out in a V shape.

In addition, an opening portion 94 surrounded by a U-shaped breaking line 92 is provided at the end portion of the third side plate 24 on the lid side.

Next, an example of how to assemble the packaging box 10 will be described. Here, regarding the folding method of each folding ruled line of the box body forming piece 18, the folding method in which the front surface is convex is referred to as normal folding, and the folding method in which the back surface is convex is referred to as reverse folding.

First, as shown in FIG. 4A, the first bottom piece 46 is folded forward along the fold ruled line 50 and overlapped with the back surface of the first side plate 20, and the second bottom piece 66 is folded forward along the fold ruled line 68. It is overlapped on the back surface of the second side plate 22, and the third bottom piece 70 is folded forward along the fold ruled line 72 and overlapped on the back surface of the third side plate 24. Further, the first gluing region 54 is reverse-folded along the fold ruled line 54a and overlapped with the front surface of the first trapezoidal region 52, and the glue 96 is applied to the back surface of the first gluing region 54. Then, as shown in FIG. 4B, the first side plate 20 is normally folded along the folding ruled line 28, and the first gluing region 54 is overlapped with the second bottom piece 66 and glued.

After that, as shown in FIG. 5A, the third gluing region 76 is reverse-folded along the fold ruled line 76a and overlapped with the front surface of the third trapezoidal region 74, and is placed on the back surface of the third gluing region 76 and the surface of the gluing piece 34. Glue 98 and 100 are applied respectively. Then, as shown in FIG. 5B, the fourth side plate 26 is normally folded along the fold ruled line 32, the fourth bottom piece 88 is overlapped with the first gluing area 76 and glued, and the gluing piece 34 is the fourth. It is glued to the back surface of the end portion of the side plate 26 of. The box body forming piece 18 is shipped from a factory or the like that manufactures the packaging box 10 in this folded state.

Next, in a factory or the like for packaging the contents, in order to make the box body forming piece 18 three-dimensional, the first to fourth side plates 20, 22, 24, 26 are folded so as to be a quadrangular tubular body 12. When the ruled lines 30, 32, 34, and 38 are folded forward at 90 degrees, the bottom 16 is automatically formed.

The operation of forming the bottom portion 16 will be described in order. First, as shown in FIGS. 6A and 6B, the first and second side plates 22 connected to each other by the glue 96 start to rise. The second bottom pieces 46 and 66 rise slightly, and similarly, the fourth side plate 26 on the opposite side starts to rise, so that the third and fourth bottom pieces 70 and 88 connected to each other by the glue 98 rise slightly.

When the second and fourth side plates 22 and 26 are further raised, as shown in FIGS. 7A and 7B, the side of the second bottom piece 66 having the second notch 66a is the third end side. Entering the notch 80a, the corner portion (broken line portion) of the second bottom piece moves along the inner surface of the third trapezoidal region 74, and the third end side protrusion 80 becomes the inner surface of the second bottom piece 66. Move along. At this time, since the third end side folding ruled line 80b is appropriately broken and the angle of the third end side protrusion 80 changes, the side side of the second bottom piece 66 smoothly enters the third end side notch 80a. You can enter.

Similarly, the side of the fourth bottom piece 88 on the opposite side where the fourth notch 88a is located is inside the first end side notch 58a, and the corner portion (broken line part) of the fourth bottom piece is the first. It moves along the inner surface of the trapezoidal region 52, and the first end side protrusion 58 moves along the inner surface of the fourth bottom piece 88. At this time, since the first end side folding ruled line 58b is appropriately broken and the angle of the first end side protrusion 58 changes, the hypotenuse of the fourth bottom piece 88 smoothly enters the first end side notch 58a. be able to.

Further, as shown in FIGS. 7A and 7B, the first auxiliary region 56 and the third auxiliary region 78 gradually approach each other in the lateral direction, and the first central side protrusion 60 and the third central protrusion 60. It comes into contact with 82 and moves so as to pass each other. At this time, the first central side folding ruled line 60b is appropriately broken to change the angle of the first central side protrusion 60, and the third central side folding ruled line 82b is appropriately folded to change the angle of the third central side protrusion 82. Since it changes, the first central protrusion 60 and the third central protrusion 82 can smoothly pass each other.

Then, when the second and fourth side plates 22 and 26 are further raised to approximately 90 degrees, a flat bottom portion 16 is formed, and the bottom end portion of the tubular body 12 is closed without a gap. At this time, the bottom portion 16 has the same shape as the bottom portion 16 in the assembled state shown in FIGS. 2 (a) and 2 (b).

Explaining the structure of the tubular body 12 and the bottom portion 16 in this state again, in the tubular body 12, the first to fourth side plates 20, 22, 24, 26 are continuous in the circumferential direction, and the first and third side plates 20 , 24 face each other in the front-rear direction, and the second and fourth side plates 22, 26 face each other in the left-right direction.

The bottom portion 16 is formed by overlapping the first to fourth bottom pieces 46, 66, 70, 88 with each other. The first glued region 54 overlaps the outer surface of the second bottom piece 60 and is joined by glue 96, and the portion of the second bottom piece 60 that does not overlap with the first glued region 54 overlaps the inner surface of the third trapezoidal region 74. .. The third glued region 76 overlaps the outer surface of the fourth bottom piece 88 and is joined by glue 98, and the portion of the fourth bottom piece 88 that does not overlap with the third glued region 76 overlaps the inner surface of the first trapezoidal region 52.

The first auxiliary region 56 and the first central side protrusion 60 enter the inner surface side of the third trapezoidal region 74, and the third auxiliary region 78 and the third central side protrusion 82 enter the inner surface side of the first trapezoidal region 52. come in. Then, the first and third bottom pieces 46 and 70 are connected to each other by the first central side notch 60a strongly engaging with the third central side notch 82a.

Further, the first end side protrusion 58 enters the inner surface side of the fourth bottom piece 88, and the first end side notch 58a strongly engages with the fourth notch 88a, so that the first bottom piece 46 becomes the fourth. Connected to the bottom piece of. Further, the third end side protrusion 80 enters the inner surface side of the second bottom piece 66, and the third end side notch 80a strongly engages with the second notch 66a, so that the second and third bottom pieces are formed. To be connected to each other.

Once the bottom 16 is formed, the inclusions are inserted through the lid-side end of the cylinder 12. Then, in order to close the end portion on the lid side, the side flaps 62 and 84 are folded forward at 90 degrees at the fold ruled lines 64 and 86, respectively. After that, glue 102 is applied to the surface of the insertion piece 42 to fold the fold ruled line 44 forward at 90 degrees, and then the lid piece 38 is folds forward at 90 degrees along the fold ruled line 40 to the end of the cylinder 12 on the lid side. Is closed, and the insertion piece 42 is inserted into the gap between the side flaps 62 and 84 and the third side plate 24 and glued to the back surface of the opening portion 94. As a result, the lid portion 14 in which the lid piece 40 and the side flaps 62 and 84 are overlapped in order is formed, and the assembled state shown in FIGS. 1 and 2 is obtained.

When opening the packaging box 10, the opening portion 94 is pushed in with a finger to break the opening breaking line 92, and the opening portion 94 is separated from the third side plate 24. This makes it possible to open the lid piece 38, and when the lid piece 38 is opened, the contents inside can be taken out. When resealing, the lid piece 38 is tilted down as before, and the insertion piece 42 is inserted into the inner surface side of the third side plate 24 to lock it.

As described above, the packaging box 10 has a one-touch type bottom portion 16 having a unique structure, and the first and second bottom pieces 46 and 66 are connected by gluing, and the second and third bottom pieces 66 and 70 are connected. Are connected by strong engagement (locking) of the notches with each other, the third and fourth bottom pieces 70 and 88 are connected by gluing, and the fourth and first bottom pieces 88 and 46 are cut with each other. The bottom 16 is very strong and has a bottom piece because the notches are connected by being strongly engaged (locked) with each other and the four bottom pieces are connected to each other to the adjacent bottom pieces. It is difficult to create a gap between the bottom piece and the bottom piece.

Further, the bottom portion 16 is provided with a configuration in which the first and third bottom pieces 46 and 70 arranged in the front-rear direction are strongly engaged (locked) with each other by the notches, so that it is equivalent to the conventional one. The strength of the bottom portion 16 can be further strengthened while ensuring the ease of assembling the bottom portion of the bottom portion 16.

The packaging box of the present invention is not limited to the above embodiment. For example, the shapes of the four bottom pieces constituting the bottom can be changed within the range in which the above-mentioned bottom assembly operation can be performed, and the balance between the strength of the bottom and the ease of assembly can be adjusted. For example, FIGS. 8A and 8B show the bottom portion 16x of the modified packaging box 10x. Compared with the bottom 16 shown in FIGS. 2 (a) and 2 (b), the structure of the portion where the first and fourth bottom pieces 46 and 88 are locked is changed, and the second and third bottom portions 16x are similarly modified. The structure of the part where the bottom pieces 66 and 70 of the above are locked has been changed.

Looking at the first and fourth bottom pieces 46,88, as shown in the box body forming piece 18x of FIG. 9, the first bottom piece 46 has the first end side protrusion 58, the first auxiliary region 56 and the first. The trapezoidal region 52 is provided so as to straddle the side side close to the glue piece 34, and the position of the first end side notch 58a is closer to the first side plate 20 than the first central side notch 60a. .. Then, in accordance with this, the position of the fourth notch 88a of the fourth bottom piece 88 is changed, and the overall shape is also changed.

Similarly, looking at the second and third bottom pieces 66 and 70, as shown in the box body forming piece 18x of FIG. 9, the third bottom piece 70 has the third end side protrusion 80 as the third auxiliary region. 78 and the third trapezoidal region 74 are provided so as to straddle the side side close to the second side plate 22, and the position of the third end side notch 80a is the third side plate 24 with respect to the third central side notch 80a. It is close to. Then, in accordance with this, the position of the second notch 66a of the second bottom piece 66 is changed, and the overall shape of the second bottom piece 66 is also changed.

As shown in FIGS. 8A and 8B, the bottom portion 16x of the modified example has the first gluing area 54 and the second bottom piece because the shapes of the second and fourth bottom pieces 66 and 88 have been changed. The area where 66 overlaps and the area where the third gluing region 76 and the fourth bottom piece 88 overlap become smaller. However, the bottom portion 16x can close one end of the tubular body 12 without a gap, and the strength substantially equal to that of the bottom portion 16 can be obtained.

The shapes of the first end side protrusion, the first center side protrusion, the third end side protrusion, and the third center side protrusion are not particularly limited, but the tip is smoothly assembled so that the bottom can be assembled smoothly. It is preferable to chamfer the portion in an arc shape. In addition, if there is no problem in the operation of assembling the bottom, the first end side fold ruled line, the first center side fold ruled line, the third end side fold ruled line and the third center side fold provided at the base end of each protrusion. The ruled line may be omitted.

The packaging box 10 is provided with three lock portions on the bottom portion 16, but has a structure in which the first and third bottom pieces 46 and 70 are locked (first central side protrusion 60 and the like and third central side protrusion). 82 etc.) can be deleted as needed. For example, when the difference between the width dimension and the depth dimension of the box body is small, if there are two other lock portions, it is difficult to form a gap between the bottom pieces, and a certain level of strength can be obtained.

10,10x Packaging box 12 Cylinder 14 Lid 16,16x Bottom 18,18x Box forming piece 20 First side plate 22 Second side plate 24 Third side plate 26 Fourth side plate 46 First bottom piece 52 First Trapezoidal area 54 1st gluing area 56 1st auxiliary area 58 1st end side protrusion 58a 1st end side notch 58b 1st end side folding ruled line 60 1st central side protrusion 60a 1st central side notch 60b 1st Central side folding ruled line 66 Second bottom piece 66a Second notch 70 Third bottom piece 74 Third trapezoidal area 76 Third glued area 78 Third auxiliary area 80 Third end side protrusion 80a Third end side notch 80b No. Three-end side fold ruled line 82 Third center side protrusion 82a Third center side notch 82b Third center side fold ruled line 88 Fourth bottom piece 88a Fourth notch 96, 98, 100, 102 Glue

Claims (5)

A cylinder having first to fourth side plates that are continuous in the circumferential direction, the first and third side plates facing each other in the front-rear direction, and the second and fourth side plates facing each other in the left-right direction. It has a body and first to fourth bottom pieces extending at the bottom ends of the first to fourth side plates, respectively, and the first to fourth bottom pieces are formed so as to overlap each other. A packaging box comprising a flat bottom, which is a one-touch bottom that is assembled by forming the cylinder into a three-dimensional quadrangle.
The first bottom piece is a region extended to the end side of the first side plate, and the outer shape is a first trapezoidal region formed in a trapezoidal shape in which the end side in the extending direction is narrowed. On the side of the fourth bottom piece of the first trapezoidal region, the first glued region extending on the oblique side near the second bottom piece, and the end side of the first trapezoidal region in the extending direction. A first auxiliary region extending at an unbalanced position and a first end side protrusion of the first auxiliary region protruding in the direction of the fourth bottom piece from a side side close to the fourth bottom piece. A notch on the first end side is provided at the base end portion of the protrusion on the first end side near the first trapezoidal region.
The second bottom piece is provided with a second notch on the side near the first bottom piece.
The third bottom piece is a region extended to the end side of the third side plate, and the outer shape is a third trapezoidal region formed in a trapezoidal shape in which the end side in the extending direction is narrowed. And, on the side of the second bottom piece of the third trapezoidal region, the third glued region extended on the oblique side near the fourth bottom piece, and the end side of the third trapezoidal region in the extending direction. A third auxiliary region extending at an unbalanced position, and a third end side protrusion protruding from the side of the third auxiliary region near the second bottom piece in the direction of the second bottom piece. The third end side notch is provided at the base end portion of the third end side protrusion near the third trapezoidal region.
The fourth bottom piece is provided with a fourth notch on the side near the third bottom piece.
With the bottom assembled, the first glued area overlaps the outer surface of the second bottom piece and is joined with glue, and the second bottom piece has a portion that does not overlap with the first glued area. The third glued region overlaps the inner surface of the trapezoidal region, and the third glued region overlaps the outer surface of the fourth bottom piece and is joined with glue. Overlapping the inner surface of the region, the first auxiliary region overlaps the inner surface of the third trapezoidal region, the third auxiliary region overlaps the inner surface of the first trapezoidal region, and the first end side protrusion is the first. By entering the inner surface side of the four bottom pieces and engaging the first end side notch with the fourth notch, the first and fourth bottom pieces are connected to each other, and the third end side protrusion Enters the inner surface side of the second bottom piece, and the third end side notch engages with the second notch, whereby the second and third bottom pieces are connected to each other. Packaging box. The first end side protrusion is provided so as to straddle the side side of the first auxiliary region and the first trapezoidal region near the fourth bottom piece, and the third end side protrusion is the third. The packaging box according to claim 1, which is provided so as to straddle the side side of the auxiliary region and the third trapezoidal region near the second bottom piece. At the boundary between the first end side protrusion and the first auxiliary region, a first end side folding ruled line is provided to facilitate the operation of assembling the bottom portion, and the third end side protrusion and the first auxiliary region are provided. The packaging box according to claim 1 or 2, wherein a third end side folding ruled line is provided at a boundary portion with the third auxiliary region to facilitate the operation of assembling the bottom portion. The first bottom piece includes a first central side protrusion that projects in the direction of the second bottom piece from a side of the first auxiliary region near the second bottom piece, and the first central side protrusion. A notch on the first central side is provided at the base end portion of the portion near the first trapezoidal region.
The third bottom piece includes a third central side protrusion that projects in the direction of the fourth bottom piece from the side of the third auxiliary region near the fourth bottom piece, and the third central side protrusion. A notch on the third central side is provided at the base end portion of the portion near the third trapezoidal region.
With the bottom assembled, the first central protrusion enters the inner surface side of the third trapezoidal region, and the third central protrusion enters the inner surface side of the first trapezoidal region. The packaging box according to any one of claims 1 to 3, wherein the first and third bottom pieces are connected to each other by engaging the first central side notch with the third central side notch. At the boundary between the first central protrusion and the first auxiliary region, first central folding ruled lines are provided to facilitate the operation of assembling the bottom, and the third central protrusion and the third central protrusion are provided. The packaging box according to claim 4, wherein a third central side folding ruled line is provided at a boundary portion with the third auxiliary region to facilitate the operation of assembling the bottom portion.

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