JP7155888B2 - packaging box - Google Patents

Description

The present invention relates to a packaging box for packaging articles.

Conventionally, a packaging box (a so-called "A-type box") is known, in which standing walls are provided on the four sides of a rectangular parallelepiped, a bottom wall is provided on the bottom, and an upper opening is closed with a plurality of flaps. When closing the opening of the packaging box, a pair of outer flaps extending from the upper edges of the pair of standing walls and a pair of inner flaps extending from the upper edges of another pair of standing walls are folded. superimposed on each other.

In addition, there is a conventional packaging box provided with a locking mechanism for fixing flaps together so that the opening can be closed without using an adhesive tape. For example, in Patent Document 1, a pair of inner flaps are provided with insertion openings, a pair of outer flaps are provided with insertion pieces, and the pair of inner flaps and the pair of outer flaps are folded and overlapped, and inserted into the insertion openings. A locking mechanism is described that secures both of the pair of outer flaps to both of the pair of inner flaps by inserting the pieces.

Japanese Patent Application Laid-Open No. 2006-219136

By the way, a packaging box is not only used as a transportation container, a packaging container, or a storage container in a state in which an article is contained in the box and the opening is fully closed, but is also used in a state in which the opening is opened, for example, in a store. In some cases, it was used as a display box for displaying commodities in a sales floor.

One of the forms of use as a display box is to open only one of a pair of outer flaps and close the other outer flap (referred to as a "semi-closed state"), and then close the opened part of the opening. , was used as an outlet for goods.
When the packaging box of Patent Document 1 is used as a semi-closed display box, since it is configured to have a locking mechanism that fixes both of a pair of flaps to another pair of flaps, it is necessary to fix one flap by the locking mechanism. work was required to remove the Therefore, the packaging box of Patent Document 1 is difficult to use as a display box, and there is room for improvement in usability as a display box.

The packaging box of the present disclosure was invented in view of the above problems, and one of the purposes is to improve usability as a display box. In addition to this purpose, it is also possible to achieve actions and effects that are derived from each configuration shown in the "Mode for Carrying out the Invention" described later and that cannot be obtained with conventional techniques. It can be positioned as another purpose.

The packaging box of the present disclosure includes a bottomed cylindrical body box portion having an upper opening surrounded on all sides by an upper edge, a first flap extending from the first upper edge of the upper edge, and the A pair of second flaps extending from each of a pair of second upper edges adjacent to both ends of the first upper edge, and a third flap extending from a third upper edge facing the first upper edge. and in a closed state in which the opening is closed, one of the first and third flaps and the pair of second flaps is arranged in a superimposed state overlapping the other, and the pair of a lid portion in which tip edges of the second flaps are spaced apart from each other; a tongue piece formed on one of the first flap and the pair of second flaps; an inserting portion formed on the other side of the second flap and into which the tongue piece can be inserted in the superimposed state; by inserting the tongue piece into the inserting portion, only the first flap can be inserted into the a locking mechanism fixed to the pair of second flaps.

A semi-closed state in which only the first flap and the pair of second flaps are fixed in an overlapping state and only the third flap can be opened by providing a lock mechanism that fixes only the first flap to the pair of second flaps. can hold Therefore, usability as a display box can be improved.

It is a perspective view which shows the fully closed state of a packaging box. It is a perspective view which shows the semi-closed state of a packaging box. FIG. 4 is a diagram illustrating details of the locking mechanism, in which (a) is an enlarged view of the tongue, (b) is an enlarged view of the insertion portion, and (c) is an enlarged view of the tongue inserted. It is a figure explaining a mode that it is inserted in a part. It is an expanded view of a packaging box. FIG. 3 is a front view of the semi-closed packaging box shown in FIG. 2 turned over 90 degrees;

Hereinafter, a packaging box as an embodiment will be described with reference to the drawings.
The packaging box of the present embodiment is a three-dimensional package assembled from flat sheet materials (also referred to as "blank sheets"). The sheet material assembled into the packaging box is a packaging material that has undergone processing such as cutting into a predetermined shape and adding ruled lines. Examples of packaging materials used for sheet materials include corrugated cardboard sheets and cardboard.

In this embodiment, the packaging box and the sheet material are assumed to be placed on a horizontal plane, and the directions used in the description are defined as follows.
1 and 2, the packaging box is placed in a state of normal use with the bottom wall portion facing downward, and the horizontal direction is the front-rear direction (the front is indicated by "F , and the rear is indicated by "B") and the left-right direction (in the figure, the left is indicated by "L" and the right is indicated by "R"). Regarding the left and right direction, the left and right are defined based on the state facing from the front to the back. In the vertical direction, the direction in which gravity acts is downward (indicated by "D" in the figure), and the direction opposite to downward is upward (indicated by "U" in the figure). In addition, an opening for taking in and out articles is provided at the top of the packaging box.

The sheet material will be described using X and Y directions that are perpendicular to each other in the horizontal direction. Each of the X direction and the Y direction extends in two directions opposite to each other. Therefore, _one of the X directions is referred to as the _X1 direction, and the other is referred to as the X2 direction. Similarly, _one of the Y directions will be called the Y1 direction and the other will be called the _Y2 direction.

[I. one embodiment]
[1. Constitution]
[1-1. packaging box]
As shown in FIGS. 1 and 2, the packaging box 1 includes a main box portion 2 having an opening O (see FIG. 2) at the top, and a lid portion 10 for closing the opening O. As shown in FIGS. 1 shows the fully closed state of the packaging box 1, and FIG. 2 shows the half closed state of the packaging box 1. As shown in FIG. Hereinafter, the “fully closed state” is a state in which the entire surface of the opening O is covered with the lid portion 10 . A “semi-closed state” is a state in which only a portion of the opening O is covered with the lid portion 10 . When not distinguishing between the fully closed state and the semi-closed state, they are referred to as "closed state".

[Body box part]
The body box portion 2 has a cylindrical shape with a bottom. In the main body box portion 2, a pair of standing wall portions 4F, 4B arranged in the front and rear direction and a pair of standing wall portions 5L, 5R arranged in the left and right direction are folded up from the bottom wall portion 3 which is rectangular in plan view.
In the main body box portion 2 shown in FIGS. 1 and 2, the vertical lengths of the vertical wall portions 4F and 4B in the left-right direction are set longer than the lengths of the vertical wall portions 5L and 5R in the front-rear direction.
The opening O of the main body box portion 2 is surrounded on all sides by upper edges 4f, 4b, 5l and 5r of the standing wall portions 4F, 4B, 5L and 5R.

The standing wall portions 4F and 4B are subdivided into a front standing wall portion 4F and a rear standing wall portion 4B. The standing wall portions 5L and 5R are subdivided into a left standing wall portion 5L and a right standing wall portion 5R. Hereinafter, the front standing wall portion 4F is referred to as the "front wall portion 4F", the rear standing wall portion 4B as the "rear wall portion 4B", the left standing wall portion 5L as the "left wall portion 5L", and the right standing wall portion 5R as the "left wall portion 5L". The right wall portion 5R”.
Here, the front-rear symmetrical and left-right symmetrical main body box portion 2 is exemplified. Therefore, the front wall portion 4F and the rear wall portion 4B are formed in the same manner, and the left wall portion 5L and the right wall portion 5R are formed in the same manner, except for the arrangement locations.

The bottom wall portion 3 may have any structure as long as it can close the bottom portion of the main body box portion 2 . For example, the bottom wall portion 3 includes a pair of lower edge outer flaps (not shown) extending from the lower edge of the rear wall portion 4B and the lower edge of the front wall portion 4F, and the lower edge of the left wall portion 5L. and a pair of lower edge inner flaps (not shown) extending from the lower edge of the right wall portion 5R.

[Lid]
A first outer flap 11B extends from an upper edge 4b of the rear wall portion 4B, and a second outer flap 11F extends from an upper edge 4f of the front wall portion 4F facing the upper edge 4b of the rear wall portion 4B. deferred.
Further, from the upper edge 5l of the left wall portion 5L and the upper edge 5r of the right wall portion 5R, which are adjacent to the left and right ends of the upper edge 4b of the rear wall portion 4B, the first inner flap 12L and the second inner flap 12R are respectively provided. is extended.
The lid portion 10 is formed by the first outer flap 11B, the second outer flap 11F, the first inner flap 12L, and the second inner flap 12R.

In the packaging box 1 of this embodiment, the first outer flap 11B corresponds to the "first flap" extending from the first upper edge (upper edge 4b) of the main box portion 2, and the first inner flap 12L and the second The two inner flaps 12R correspond to a pair of "second flaps" extending from a pair of second upper edges (upper edges 5l, 5r) adjacent to both ends of the first upper edge, and a second outer flap. 11F corresponds to a "third flap" extending from a third upper edge (upper edge 4f) facing the first upper edge.

In the fully closed state of the packaging box 1, the first outer flap 11B, the second outer flap 11F, the first inner flap 12L, and the second inner flap 12R are arranged around the upper edges 4b, 4f, 5l, and 5r, respectively. 2 is bent inward. In this state, the first outer flap 11B and the second outer flap 11F are arranged in a superposed state in which they are superimposed on the outside of the first inner flap 12L and the second inner flap 12R, respectively. The tip edges 110 of the first outer flap 11B and the second outer flap 11F are arranged so as to face each other, and the entire surface of the opening O of the main body box portion 2 is covered.
On the other hand, the first inner flap 12L and the second inner flap 12R are arranged inside the first outer flap 11B and the second outer flap 11F. there is

[Lock mechanism]
A pair of left and right tongues 41L and 41R are provided on the first outer flap 11B. Also, the first inner flap 12L is provided with an insertion portion 42L corresponding to the tongue 41L, and the second inner flap 12R is provided with an insertion portion 42R corresponding to the tongue 41R. These tongues 41L, 41R and insertion portions 42L, 42R function as a lock mechanism 40 for fixing the first outer flap 11B to the first inner flap 12L and the second inner flap 12R. That is, the locking mechanism 40 is provided to fix only one of the first outer flap 11B and the second outer flap 11F, the first outer flap 11B, to the first inner flap 12L and the second inner flap 12R. ing. The other second outer flap 11</b>F is not fixed to the first inner flap 12</b>L and the second inner flap 12</b>R by the lock mechanism 40 .

The tongue piece 41L and the insertion portion 42L are provided at positions overlapping each other in the closed state. Similarly, the tongue piece 41R and the inserting portion 42R are provided at positions overlapping each other in the closed state. For example, the tongues 41L and 41R and the insertion portions 42L and 42R shown in FIGS. 1 and 2 are arranged in the center of the overlapping portions of the first outer flap 11B, the first inner flap 12L and the second inner flap 12R, respectively. be.

The lock mechanism 40 is formed symmetrically. Therefore, a detailed configuration will be described by paying attention to one tongue piece 41L and the insertion portion 42L.
FIG. 3(a) is an enlarged view of the tongue 41L. The tongue piece 41L is formed by a C-shaped notch with its left side open, and has a base portion 411 connected to the first outer flap 11B and an extension piece 412 extending rightward from the base portion 411 . The extending piece 412 can swing vertically around the base 411 . The longitudinal dimension W1 of the extension piece 412 is set larger than the longitudinal dimension W2 of the base portion 411 .

FIG. 3B is an enlarged view of the insertion portion 42L. The insertion portion 42L is formed by a U-shaped cut open to the left, and has a base portion 421 connected to the first inner flap 12L and a cut piece 422 extending from the base portion 421 to the right. The cut piece 422 can swing vertically around the base 421 . The longitudinal dimension W3 of the cut piece 422 is set smaller than the longitudinal dimension W1 of the extension piece 412 . For example, the longitudinal dimension W3 of the cut piece 422 shown in FIG. 3B is set to be the same as the longitudinal dimension W2 of the base 411 of the tongue 41L.

[Detailed configuration of the inner flap]
As shown in FIGS. 1 and 2, the first inner flap 12L and the second inner flap 12R are respectively provided with notches 50L and 50R at portions overlapping the second outer flap 11F in the closed state. . The notch portion 50L is formed by cutting out an L-shape in a plan view, including a first side 51L parallel to the upper edge 5l and a second side 52L extending perpendicularly to the first side 51L. That is, the notch portion 50L is formed in a shape in which the leading edge 120L of the first inner flap 12L is recessed toward the upper edge 5l. The other cutout portion 50R is formed symmetrically with the cutout portion 50L.

In addition, the first inner flap 12L has an extending portion 121L extending rightward from the upper edge 5l (that is, toward the inside of the opening O) to the first side 51L at a portion overlapping the second outer flap 11F in the closed state. have. Similarly, the second inner flap 12R has an extending portion 121R that extends leftward from the upper edge 5r (that is, toward the inside of the opening O) to the first side 51R in a portion that overlaps the second outer flap 11F in the closed state. have

[zipper structure]
Moreover, between the second outer flap 11F and the upper edge 4f, there is a zipper structure 80 having cuts 81 intermittently formed. The zipper structure 80 is a tear line for separating the second outer flap 11F from the front wall portion 4F. The zipper structure 80 shown in FIG. 1 has a plurality of cuts 81 formed at a constant pitch from the right end to the left end of the upper edge 4f.
In the zipper structure 80 shown in FIG. 1, the breaking directions when the second outer flap 11F is separated from the upper edge 4f are set in both left and right directions. That is, each cut 81 has a first cut line extending along the length direction (horizontal direction) of the upper edge 4f and a second cut line extending obliquely with respect to the first cut line. be provided. Specifically, among the plurality of cuts 81, in the plurality of cuts 81 arranged on the left side of the center in the left-right direction of the second outer flap 11F, the second cut line is the upstream end of the first cut line in the breaking direction. from the second outer flap 11F toward the second outer flap 11F, and the breaking direction is set from left to right. On the other hand, in the plurality of cuts 81 arranged on the right side of the center, the second cut line is inclined right rearward from the upstream end of the first cut line in the breaking direction toward the second outer flap 11F, The fracture direction is set from right to left.

[1-2. Opening and closing the lid]
Next, the procedure for opening and closing the opening of the packaging box 1 will be described.
In the packaging box 1 having the above configuration, when closing the opening O with the lid portion 10, the operator opens the first inner flap 12L, the second inner flap 12R, the first outer flap 11B, and the second outer flap 11F, The first outer flap 11B and the second outer flap 11F are bent toward the inside of the opening O about the upper edges 5l, 5r, 4b, and 4f, respectively, and the first inner flap 12L and the second inner flap 12R are folded. superimposed on the outside of the
As a result, the packaging box 1 is in the fully closed state shown in FIG. When sealing the packaging box 1, an adhesive tape 90 (indicated by a chain double-dashed line in FIG. 1) is attached along the leading edges 110 of the first outer flap 11B and the second outer flap 11F. The packaging box 1 is reliably sealed by sticking the adhesive tape 90 from the left wall portion 5L to the right wall portion 5R.

Next, a procedure for opening the opening O of the packaging box 1 sealed in the fully closed state as shown in FIG. 1 to the semi-closed state shown in FIG. 2 will be described.
First, the operator pushes the tongues 41L and 41R on the first outer flap 11B downward from above. Here, since the first outer flap 11B, the first inner flap 12L and the second inner flap 12R are overlapped with each other, the pushed-in tongues 41L and 41R are separated from the first inner flap 12L and the second inner flap 12R, respectively. It is inserted into the upper insertion portions 42L and 42R.

The state in which the tongues 41L and 41R are inserted into the insertion portions 42L and 42R will be described with reference to FIG. The operator pushes the extension piece 412 of the tongue piece 41L downward from above. When the extending piece 412 is pushed downward from the first outer flap 11B with the base portion 411 as an axis, the tip of the pushed extending piece 412 pushes down the cut piece 422 of the insertion portion 42L, thereby pushing the first inner flap 12L. is pushed to the bottom surface of the Since the longitudinal dimension W3 of the cut piece 422 is set smaller than the longitudinal dimension W1 of the extension piece 412, the tip of the extension piece 412 is locked to the lower surface of the first inner flap 12L. Thereby, the first outer flap 11B is fixed to the first inner flap 12L.
The first outer flap 11B and the second inner flap 12R are similarly fixed by cooperation between the tongue 41R and the insertion portion 42R.

After fixing the first inner flap 12L and the second inner flap 12R to the first outer flap 11B in this manner, the operator removes the adhesive tape 90 and then cuts off the second outer flap 11F from the upper edge 4f. Thus, the packaging box 1 is in the half-open state shown in FIG. Since the first outer flap 11B, the first inner flap 12L, and the second inner flap 12R are fixed by the lock mechanism 40, the semi-closed state is maintained.

[Sheet material]
Next, the sheet material 1S assembled into the packaging box 1 will be described with reference to FIG.
The sheet material 1S is a sheet of packaging material cut into a predetermined shape.
In the following description, a ruled line extending in the Y direction (for example, the direction along which the flutes extend when the sheet material 1S is made of corrugated cardboard) is referred to as a "crease", and a crease is referred to as a "crease". A ruled line extending in a direction orthogonal to the direction in which the columns extend in the case of a sheet is called a "score".

A rear wall sheet piece 4B corresponding to the rear wall portion 4B, a left wall sheet piece 5L corresponding to the left wall portion 5L, a front wall sheet piece 4F corresponding to the front wall portion 4F, and a A right wall sheet piece 5R corresponding to the right wall portion 5R is provided. Boundaries of the sheet pieces 4B, 5L, 4F and 5R are defined by a _first crease C1, a _second crease C2 and a _third crease C3, respectively. _A connecting sheet piece 9 is provided on the X1 direction side of the rear wall sheet piece 4B via a _fourth crease C4.

_In the Y1 direction region of the sheet material 1S, flap sheet pieces 31B, 32L, 31F, and 32R as sheet pieces forming the bottom wall portion ₃ are arranged in the Y1 direction from the sheet pieces 4B, 5L, 4F, and 5R, respectively. It protrudes and is provided. The boundaries between the flap sheet pieces 31B, 32L, 31F, 32R and the sheet pieces 4B, 5L, 4F, 5R are the _fourth score S4, the _fifth score S5, the _sixth score S6, and the _seventh score S7. partitioned.

_In the Y2 direction region of the sheet material 1S, a first outer flap sheet piece 11B corresponding to the first outer flap 11B, a first inner flap sheet piece 12L corresponding to the first inner flap 12L, and a second outer flap 11F are provided. A corresponding second outer flap sheet piece 11F and a second inner flap sheet piece 12R corresponding to the _second inner flap 12R are provided so as to protrude in the Y2 direction from the sheet pieces 4B, 5L, 4F and 5R, respectively.
A first score S1 is provided at the boundary between the first outer flap sheet piece 11B and the rear wall sheet piece 4B, and a _second score S2 is provided at the boundary between the _first inner flap sheet piece 12L and the left wall sheet piece 5L. is provided, and a _third score S3 is provided at the boundary between the second inner flap sheet piece 12R and the right wall sheet piece 5R. Also, the boundary between the second outer flap sheet piece 11F and the front wall sheet piece 4F is partitioned in the Y direction by a fracture portion 80 having an _eighth score S8. The breaking portion 80 corresponds to the zipper structure 80 described above.

[Tongue]
On the first outer flap sheet piece 11B, tongue pieces 41L and 41R are respectively formed at two predetermined positions spaced apart in the X direction. The tongue 41L is formed by a C _- shaped cut open in the X2 direction. Also, the tongue 41R is formed symmetrically with the tongue 41L in the X direction.

[insertion part]
An insertion portion 42L is formed in the first inner flap sheet piece 12L, and an insertion portion 42R is formed in the second inner flap sheet piece 12R. The insertion portion 42L is formed by a U _- shaped cut open in the Y1 direction. Also, the insertion portion 42R is formed symmetrically with the insertion portion 42L in the X direction.

The Y-direction dimension of the base portions of the tongues 41L and 41R [see FIG. 3A] is set larger than the X-direction dimension of the insertion portions 42L and 42R. Also, the X-direction dimension of the tongue pieces 41L and 41R and the Y-direction dimension of the insertion portions 42L and 42R are set to be the same.

[Detailed configuration of the inner flap sheet piece]
Notch portions 50L and 50R that are L-shaped in a plan view are formed at the leading edge of the first inner flap sheet piece 12L in the Y2 direction and the leading edge of the _second inner flap sheet piece 12R in the _Y2 direction, respectively. there is The notch 50L has a first side 51L parallel to the _second score S2 and a _second side 52L perpendicular to the first side 51L. It has a side 51R and a second side 52R perpendicular to the first side 51R.

The first inner flap sheet piece 12L is formed with an extending portion _121L extending planarly in the Y2 direction from the _second score S2 between the first side 51L and the _second score S2. Further, the second inner flap sheet piece 12R is formed with an extending portion 121R extending planarly in the Y2 direction from the _third score S3 between the _first side 51R and the _third score S3. .

[Effect]
As described above, the packaging box 1 of the present embodiment is provided with the lock mechanism 40 that fixes only the first outer flap 11B to the first inner flap 12L and the second inner flap 12R. The first inner flap 12L and the second inner flap 12R can be fixed only to 11B, and the semi-closed state in which only the second outer flap 11F can be opened can be maintained. Therefore, usability as a display box can be improved. Of course, with the opening O fully closed, the packaging box 1 can be used as a transportation container, a packaging container, or a storage container. In this specification, "usability as a display box" includes ease of work when using (diverting, diversion) a packaging box as a display box, ease of taking out goods, and visibility of goods. be

FIG. 5 is a front view of the packaging box 1 in the semi-closed state shown in FIG. 2, which has been turned over by 90 degrees so that the front wall portion 4F faces downward. When the packaging box 1 is turned over 90 degrees as shown in FIG. 5, the opening O (see FIG. 2) at the top of the main box part 2 is the front surface (front standing wall surface), and the upper part of the front surface is the first outer flap 11B. It can be used as a display box that is closed and the lower part of the front surface is opened as an extraction window 70.例文帳に追加

According to the mode of use of the display box shown in FIG. 5, since the take-out window 70 can be provided on the front surface, the visibility of the articles housed in the box is good.
Since the take-out window 70 is positioned at the bottom of the front surface, it is suitable for use in which articles packed in the box are taken out sequentially from below. Such usage is excellent in that the articles in the box can be easily taken out.
Thus, the packaging box 1 of this embodiment is excellent in usability as a display box.

In addition, according to the usage form of the display box shown in FIG. 5, since the upper part of the front standing wall surface is closed by the first outer flap 11B, the stored articles can be supported so as not to spill out.

In the closed state, the first inner flap 12L and the second inner flap 12R are arranged such that the tip edges 120L and 120R (see FIGS. 1 and 2) of the first inner flap 12L and the second inner flap 12R are respectively attached to the upper edges 5l and 120R. Since the notch portions 50L and 50R (see FIGS. 1 and 2) are provided so as to be recessed toward the upper edge 5r (see FIGS. 1 and 2), the tip edges 120L and 120R (see FIGS. 1, see FIG. 2) can be spaced farther apart. Therefore, when used as a display box as shown in FIG. 5, the lateral width of the extraction window 70 can be increased.

In addition, the first inner flap 12L and the second inner flap 12R have extended portions 121L and 121R at portions overlapping with the second outer flap 11F in the closed state, so that cutout portions 50L and 50R (Fig. 1 and 2) is provided, the extensions 121L and 121R can support the second outer flap 11F in the closed state. When used as a display box as shown in FIG. 5, the extensions 121L and 121R serve as support plates arranged at both left and right ends of the take-out window 70 to support articles in the box.

In addition, the lock mechanism 40 has tongues 41L and 41R formed on the first outer flap 11B, and insertion portions 42L and 42R formed on the first inner flap 12L and the second inner flap 12R. The first inner flap 12L and the second inner flap 12R can be fixed to the first outer flap 11B by pushing the tongue pieces 41L and 41R downward from above, which improves the work efficiency.

[others]
An embodiment of the present invention has been described above, but the present invention can be implemented by appropriately modifying the embodiment without departing from the scope of the invention.

For example, in the above embodiment, the first outer flap 11B corresponds to the "first flap", the first inner flap 12L and the second inner flap 12R correspond to the "second flap", and the second outer flap 12L and the second inner flap 12R correspond to the "second flap". The case where the flap 11F corresponds to the "third flap", that is, the case where the first flap and the third flap are overlapped on the outside of the pair of second flaps with the lid portion 10 closed has been described as an example. However, the lid portion 10 may be configured such that the pair of second flaps overlaps the outer sides of the first flap and the third flap.

Further, the lock mechanism 40 is not limited to a structure in which the tongues 41L and 41R formed on the first outer flap 11B are pushed downward from above. By forming the tongue piece 41R on the flap 12R and forming the insertion portions 42L and 42R on the first outer flap 11B, the tongue pieces 41L and 41R formed on the first inner flap 12L and the second inner flap 12R can be pulled downward. It may be configured as a structure that pushes upward from the box (that is, from the inside of the box toward the outside).

Further, for example, when the packaging box 1 has a shape that extends in the left-right direction, the distance between the leading edges 120L and 120R of the first inner flap 12L and the second inner flap 12R is widened in the closed state. 50L and 50R are unnecessary.

The packaging box 1 is not limited to a rectangular parallelepiped shape, and may be of any shape such as a cubic shape, a prismatic shape, etc., as long as it has a bottomed cylindrical shape at the top with an opening surrounded by upper edges on all four sides. That is, the packaging box 1 may have any proportion.

1 Packaging box 1S Sheet material 2 Main box part 3 Bottom wall part 4B Rear wall part, side wall sheet piece 4F Front wall part, side wall sheet piece 4f, 4b, 5l, 5r Upper edge 5L Left wall part, end wall sheet piece 5R Right Wall portion, end wall sheet piece 9 Joining sheet piece 10 Lid portion, lid portion sheet piece 11B First outer flap, first outer flap sheet piece 11F Second outer flap, second outer flap sheet piece 12L First inner flap, second One inner flap sheet piece 12R Second inner flap, second inner flap sheet piece 40 Lock mechanism 41L, 41R Tongue piece 42L, 42R Insertion part 50L, 50R Notch part 51L, 51R First side 52L, 52R Second side 90 Adhesion Tape 110 Tip 120L, 120R Tip edge 121L, 121R Extension part 411 Base part 412 Extension piece 421 Base part 422 Cut piece C Crease O Opening S Score

Claims (5)

a bottomed tubular body box portion having an opening at the top that is surrounded on all sides by an upper edge;
A first flap extending from a first upper edge of the upper edges, a pair of second flaps extending from a pair of second upper edges adjacent to both ends of the first upper edge, and and a third flap extending from a third upper edge facing the first upper edge, wherein tip edges of the first flap and the third flap are placed against each other to cover the entire surface of the opening. In the fully closed state, one of the first flap, the third flap, and the pair of second flaps is arranged in a superimposed state, and the leading edges of the pair of second flaps are arranged to overlap each other. a lid portion in which are spaced apart from each other;
The lid portion is formed on either one of the first flap and the pair of second flaps, and on the other of the first flap and the pair of second flaps. In the fully closed state in which the first flap and the second flap are arranged in the superimposed state, an insertion portion into which the tongue piece can be inserted is provided, and the tongue piece is inserted into the insertion portion so that the second flap can be opened. A packaging box comprising a lock mechanism for fixing only one flap to the pair of second flaps. 2. The packaging box of claim 1, comprising a zipper structure having intermittent notches formed between said third upper edge and said third flap. 3. The pair of second flaps according to claim 1 or 2, wherein each of the pair of second flaps has a cutout portion formed by recessing the tip edge toward the second upper edge in the overlapping state. packaging box. 3. Each of the pair of second flaps has an extension portion extending from the second upper edge toward the inner side of the opening at a portion overlapping the third flap in the overlapping state. The packaging box described in . The locking mechanism is
the tongue is formed on one of the first flap and the pair of second flaps arranged outside in the overlapping state;
5. The packaging box according to any one of claims 1 to 4, wherein the insertion portion is formed in the other of the first flap and the pair of second flaps .

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