JP5690762B2 - Packaging box - Google Patents

Description

  The present invention relates to a packaging box for packing products and the like, and more particularly to a mechanism for locking an inner lid and an upper lid that are connected to upper ends of opposing side plates of the packaging box.

  Conventionally, as a packaging box used when packing and shipping a packaged item such as a small electrical product, a precision device main body, or a replacement part, the upper lid and the inner lid are configured to overlap each other at the opening. Packaging boxes are widely used. In such a packaging box, it is common to provide a lock mechanism so that the upper lid and the inner lid are not easily opened during transportation or the like.

  For example, in Patent Document 1, a protrusion is provided at the tip of an outer flap (upper lid), and a long hole into which the protrusion is inserted is provided at an opening / closing fulcrum portion of the inner flap (inner lid). A fitting hole into which the first cut and raised are provided, and a first cut and raised whose lower side is a fulcrum is provided below and a second cut and raised whose upper side is a fulcrum is provided inside the first cut and raised. A packaging box provided on the protruding portion is disclosed.

  According to the configuration of Patent Document 1, since the projecting portion of the outer flap is inserted into the long hole provided in the opening / closing fulcrum portion of the inner flap and the lower portion of the second cut-and-raised portion is pushed into the box, the work can be performed. When the package is unpacked, the outer flap can be easily opened simply by pulling the upper side of the first cut and raised.

JP-A-8-72867

  By the way, in the product distribution process, there may be a problem that the contents are extracted from the packaging box. At this time, if the trace of opening the packaging box does not remain, it will be delayed to find out the contents and the product will be easily stolen. As a countermeasure, it is possible to visually reveal the trace of opening the packaging box when the contents are extracted.

  Conventionally, a method has been generally used in which an upper lid is glued at the time of product packaging, and the upper lid glued at the time of unpacking is easily peeled off from a specified location. However, this method requires a step of applying glue (adhesive) at the time of packaging, which increases the number of members and the number of manufacturing steps, leading to an increase in the cost of the packaging box. Moreover, in order to stabilize the quality at the time of packing, facilities, such as a gluing apparatus, are needed.

  In view of the above-described problems, an object of the present invention is to provide a packaging box with a simple configuration that does not require gluing at the time of packaging and that can clearly see an opened trace and that is excellent in strength and airtightness. .

  In order to achieve the above object, the present invention is composed of a bottom surface and side plates erected on the four sides of the bottom surface, the box having an open top surface, and a folding line on one side of the opening edge of the box. An upper lid that is continuously provided via a fold line on a side of the opening edge of the box that faces the side on which the upper lid extends, and that overlaps the inner side of the upper lid, and the upper lid A first insertion piece formed by bending the tip of the first insertion piece, and a second insertion piece connected to one side end portion of the first insertion piece via a folding line, the other of the first insertion pieces An insertion piece in which a cut is provided between the side end of the first lid and the upper lid, a first insertion hole formed in the inner lid and into which the first insertion piece is inserted, and one end of the first insertion hole. And a second insertion hole into which the second insertion piece is inserted. The first insertion hole has the first insertion hole when the box body is assembled into a rectangular shape in plan view. It is formed at a position shifted by a predetermined distance in the extending direction of the first insertion piece from a position facing the piece, the box body is deformed into a parallelogram in plan view, and the second insertion piece is bent In this state, the insertion piece is inserted into the insertion hole, and the upper lid and the inner lid are fixed in a closed state by returning the box to a rectangular shape in plan view.

  In the packaging box having the above-described configuration, the inner lid is provided with an engagement piece that protrudes in the direction of the side plate where the upper lid is continuously provided, than the other part of the inner lid, When the box is assembled in a rectangular shape in plan view, the engagement piece is engaged with an engagement hole provided in the side plate provided continuously with the upper lid.

  According to the present invention, in the packaging box configured as described above, the engagement piece is formed with a fold line extending in a direction substantially perpendicular to a protruding direction of the engagement piece.

  According to the present invention, in the packaging box having the above-described configuration, a pair of lid flaps that extend on an opening edge where the upper lid and the inner lid of the box body are not continuously provided and overlap the inner side of the upper lid with the upper lid closed. When the box is assembled in a rectangular shape in plan view, at least one end edge of the lid flap is arranged in abutted state along the end edge of the inner lid.

  Further, in the packaging box having the above-described configuration, the present invention has an upper end of the side plate that is close to the upper lid when the insertion piece is inserted into the insertion hole, among the side plates to which the lid flap is continuously provided. A protruding piece for regulating horizontal movement in the closed state of the upper lid is formed.

  According to the present invention, in the packaging box having the above-described configuration, the bottom surface includes a pair of bottom plates that are connected to two opposite sides of the opening edge of the box via a fold line, and the bottom plate of the box. A pair of bottom flaps extending to the opening edge that is not provided are engaged, and the engagement between the bottom plate and the bottom flap is slidable in the horizontal direction. .

  Moreover, the present invention is characterized in that, in the packaging box configured as described above, an angle formed by the first insertion hole and the second insertion hole is 90 degrees or less.

  According to the present invention, in the packaging box having the above-described configuration, the opening means cuts two broken lines formed in the upper lid along the extending direction of the insertion piece and a band-shaped portion between the broken lines. It is characterized by being comprised with the holding part for.

  According to the present invention, in the packaging box having the above-described configuration, a lid plate fixing piece is formed on a portion remaining after the strip-like portion is cut off on the upper lid, and the lid plate fixing piece is formed on the inner lid. A slit to be inserted is formed.

  According to the first configuration of the present invention, when the assembly of the packaging box is completed, the second insertion piece connected to one end of the first insertion piece is inserted into the second insertion by the repulsive force (restoring force) of the sheet material. It arrange | positions in the position which does not overlap with a hole. Further, the notch at the other end of the first insertion piece is engaged with the insertion hole, and the upper lid and the inner lid are locked. Since it is impossible to release the locked state between the upper lid and the inner lid from the outside of the packaging box, it is necessary to separate the insertion piece from the upper lid by the opening means in order to open the packaging box. Thereby, it can be confirmed at a glance whether or not the packaging box has been opened, and it is possible to easily find out the contents from the packaging box in the product distribution process.

  Further, according to the second configuration of the present invention, in the packaging box of the first configuration, the inner lid is provided with an engagement piece projecting in the direction of the side plate where the upper lid is continuously provided rather than other portions of the inner lid. When the box is assembled in a rectangular shape in plan view, the engagement piece engages with the engagement hole provided in the side plate connected to the upper lid, thereby deforming the rectangular box into a parallelogram. Even if it tries, the box will not be easily deformed into a parallelogram shape due to the engagement between the tip of the engagement piece and the engagement hole. Therefore, it is possible to more reliably prevent an attempt to open the packaging box by changing the shape of the box into a parallelogram and shifting the position of the insertion hole.

  Moreover, according to the 3rd structure of this invention, in the packaging box of the said 2nd structure, a folding line extended in the direction substantially orthogonal to the protrusion direction of an engagement piece is formed in an engagement piece, and packaging is carried out. When the box is deformed into a parallelogram when the box is assembled, the engagement piece is bent into a mountain shape along the fold line, so the tip of the engagement piece does not interfere with the engagement hole, and the box is smooth Can be deformed.

  According to the fourth configuration of the present invention, in the packaging box having any one of the first to third configurations, the upper lid and the inner lid of the box body are extended to the opening edge that is not continuously provided, and the upper lid is closed. When the box is assembled in a rectangular shape in plan view, at least one edge of the lid flap is abutted along the edge of the inner lid. As a result of the arrangement, even if the rectangular box is to be deformed into a parallelogram, the lid flap and the edge of the inner lid interfere with each other so that the box is not easily deformed into a parallelogram. Therefore, it is possible to more reliably prevent an attempt to open the packaging box by changing the shape of the box into a parallelogram and shifting the position of the insertion hole.

  Moreover, according to the 5th structure of this invention, when inserting an insertion piece in an insertion hole among the side plates with which a lid | cover flap is connected in the packaging box in any one of the said 1st thru | or 4th structure. Even if you try to deform a rectangular box to a parallelogram by forming a protruding piece that restricts horizontal movement in the closed state of the upper cover at the upper end of the side plate that is closer to the upper cover, the protruding piece and the upper cover The box does not easily deform into a parallelogram due to interference with the side edges. Therefore, it is possible to more reliably prevent an attempt to open the packaging box by changing the shape of the box into a parallelogram and shifting the position of the insertion hole.

  Further, according to the sixth configuration of the present invention, in the packaging box having any one of the first to fifth configurations, a pair that is connected to two opposite sides of the opening edge of the box body via a folding line. The bottom plate of the box and a pair of bottom flaps extending to the opening edge where the bottom plate of the box is not connected are formed to form the bottom surface of the box, and the bottom plate and the bottom flap are engaged horizontally. When the packaging box is assembled, when the box is deformed into a parallelogram or when the parallelogram box is returned to a rectangular shape, the engagement between the bottom plate and the bottom flap is horizontal. The box can be smoothly deformed by sliding in the direction.

  According to the seventh configuration of the present invention, in the packaging box having any one of the first to sixth configurations, the angle formed by the first insertion hole and the second insertion hole is 90 degrees or less. The second insertion piece is bent 90 degrees or more and inserted into the second insertion hole. Therefore, the angle between the second insertion piece whose angle has changed from the bent state due to the repulsive force of the sheet material and the second insertion hole is increased, and the locked state between the inner lid and the upper lid becomes more reliable.

  Moreover, according to the 8th structure of this invention, in the packaging box of the said any one of the said 1st thru | or 7th structure, an opening means is formed in an upper cover along the extension direction of a piece. By comprising a break line and a gripping part for cutting out a band-like portion between the break lines, it becomes an unsealing means capable of separating the insertion piece from the upper lid and opening the packaging box with a simple structure.

  Further, according to the ninth configuration of the present invention, in the packaging box of the eighth configuration, the cover plate fixing piece is formed on a portion remaining after the strip-shaped portion of the upper lid is cut off, and the cover plate is formed on the inner lid. By forming the slit into which the fixed piece is inserted, the upper lid and the inner lid can be held in a closed state even after the packaging box is opened.

The expanded view of the packaging box 100 which concerns on one Embodiment of this invention. The perspective view of the packaging box 100 which shows the state which assembled the box 30 which has the opening part 31 in the upper end from the state of FIG. The perspective view of the packaging box 100 which shows the state which bent the lid | cover flaps 11 and 12 and the inner lid 10 from the state of FIG. The perspective view of the packaging box 100 which shows the state which deform | transformed the box 30 into the parallelogram shape in planar view from the state of FIG. The top view which looked at the packaging box 100 from the upper direction of FIG. The perspective view of the packaging box 100 which shows the state which inserts the 1st insertion piece 9a and the 2nd insertion piece 9b in the insertion hole 19 provided in the inner cover 10. FIG. The enlarged view which looked at the 2nd insertion piece 9b periphery in FIG. 6 from diagonally right direction The perspective view which shows the state which the assembly of the packaging box 100 was completed The top view inside the upper surface of the packaging box 100 of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a development view of the packaging box 100 of the present invention. In addition, in FIG. 1, a mountain fold line is displayed with a broken line. Further, the vertical direction (horizontal direction of the packaging box 100) in FIG. 1 is referred to as an X-axis direction, and the horizontal direction (vertical direction of the packaging box 100) is referred to as a Y-axis direction.

  The packaging box 100 is formed of a single sheet material such as corrugated cardboard, and is folded into four side plates 1, 2, 3, 4 connected in series via a fold line and to the lower side of the side plates 1, 3 On the bottom plates 5 and 6 connected through the bottom plate, bottom flaps 7 and 8 connected to the lower sides of the side plates 2 and 4 through the fold line, the top lid 9 connected to the upper side of the side plate 1 through the fold line, and the upper side of the side plate 3 The inner lid 10 is connected via a folding line, and the lid flaps 11 and 12 are connected to the upper sides of the side plates 2 and 4 via a folding line. The lid flap 11 is formed in a triangular shape in plan view, and the lid flap 12 is formed in a trapezoidal shape in plan view. The side plate 1 and the side plate 3 and the side plate 2 and the side plate 4 are formed so that the lengths in the X-axis direction are equal to each other. An adhesive piece 1a is connected to the edge of the side plate 1 via a fold line.

  A first insertion piece 9a is connected to the side of the upper lid 9 facing the side plate 1 via a first break line 13a made of a perforation, and a fold line is formed at one end in the longitudinal direction of the first insertion piece 9a. The 2nd insertion piece 9b is provided in a row through. In addition, a cut 9c is provided between the first insertion piece 9a and the upper lid 9 at the end opposite to the second insertion piece 9b.

  Further, the upper lid 9 is formed with a second breaking line 13b having a perforation substantially parallel to the first breaking line 13a so as to cross the upper lid 9 in the X-axis direction. Is provided with a grip 15 at a portion sandwiched between the first break line 13a and the second break line 13b. A lid plate fixing piece 17 for holding the upper lid in a closed state after unpacking of the packaging box 100 is formed at a substantially central portion in the X-axis direction of the upper lid 9. The length of the upper lid 9 in the X-axis direction is substantially the same as the length of the side plates 1 and 3 in the X-axis direction, and the length of the Y-axis direction is substantially the same as the length of the side plates 2 and 4 in the X-axis direction. .

  The inner lid 10 has a first insertion hole 19a formed along the boundary between the side plate 3 and the inner lid 10 (opening / closing support line of the inner lid 10), and a predetermined angle at one end of the first insertion hole 19a. An insertion hole 19 having a substantially letter shape in plan view is provided, which is composed of a second insertion hole 19b that is continuous (90 degrees or less here). The first insertion piece 9a is inserted into the first insertion hole 19a, and the second insertion piece 9b is inserted into the second insertion hole 19b. The first insertion hole 19a is formed at a position shifted by a predetermined distance in the X-axis direction from a position facing the first insertion piece 9a when the packaging box 100 is assembled.

  A slit 20 into which the lid plate fixing piece 17 of the upper lid 9 is inserted is formed at the approximate center of the inner lid 10 in the X-axis direction. Note that the length of the slit 20 in the X-axis direction is longer than the length of the lid plate fixing piece 17 in the X axis direction so that the lid plate fixing piece 17 can be inserted.

  An engagement piece 21 is formed at one end of the inner lid 10 in the X-axis direction. The front end of the engagement piece 21 protrudes from the other part of the inner lid 10 in the Y-axis direction, and engages with the engagement hole 23 formed in the opposing part of the side plate 1 when the packaging box 100 is assembled. . The engagement piece 21 is formed with two folding lines extending in the X-axis direction.

  Further, a projecting piece 25 is provided adjacent to the lid flap 12 on the upper side of the side plate 4. No fold line is provided at the base portion (base end portion) of the protruding piece 25, and the protruding piece 25 forms a wall portion protruding from the upper side of the side plate 4 when the packaging box 100 is assembled.

  Next, the assembly procedure of the packaging box 100 of this invention is demonstrated. First, after folding the fold line between the side plates 1 to 4, the adhesive piece 1 a is bonded to the inside of the side plate 4 to form the body portion of the packaging box 100. Then, the bottom plates 5 and 6 and the bottom flaps 7 and 8 connected to the lower sides of the side plates 1 to 4 are bent inward to engage the protrusions of the bottom plate 6 and the bottom flaps 7 and 8 with the recesses 5a of the bottom plate 5, The bottom surface of the packaging box 100 is formed. As a result, as shown in FIG. 2, a box body 30 having a rectangular shape in plan view (hereinafter simply referred to as a rectangular shape) having an opening 31 at the upper end surrounded by the bottom surface and the side plates 1 to 4 is formed.

  Next, after the article to be packed is stored in the box 30 from the opening 31, the lid flaps 11, 12, the inner lid 10 and the upper lid 9 are folded inward in this order along the fold line. . FIG. 3 shows a state in which the lid flaps 11 and 12, the inner lid 10 and the upper lid 9 are bent. At this time, as shown in FIG. 3, the insertion hole 19 extends from the position (indicated by a broken line in FIG. 3) facing the first insertion piece 9a and the second insertion piece 9b (see FIG. 3). 3 is in a position shifted to the right).

  Therefore, the box body 30 is deformed so that the insertion hole 19 faces the first insertion piece 9a and the second insertion piece 9b. 4 is a perspective view of the packaging box 100 showing a state in which the box 30 is deformed from the state of FIG. 3, and FIG. 5 is a plan view of the packaging box 100 as viewed from above in FIG. For convenience of explanation, FIG. 5 shows a state where the upper lid 9 is removed.

  As shown in FIGS. 4 and 5, the side plates 1 and 3 are pressed in the direction of the white arrow in the figure to deform the box 30 into a parallelogram shape in plan view (hereinafter simply referred to as a parallelogram shape). As a result, the upper lid 9 connected to the side plate 1 and the inner lid 10 connected to the side plate 3 also move in the direction of the white arrow.

  Then, as shown in FIG. 6, the box 30 is deformed to a position where the first insertion piece 9a of the upper lid 9 and the first insertion hole 19a of the inner lid 10 face each other, and the first insertion piece 9a and the second insertion piece 9 b is inserted into the insertion hole 19 provided in the inner lid 10. At this time, as shown in FIG. 7, the second insertion piece 9b is inserted into the second insertion hole 19b while being bent according to the angle of the second insertion hole 19b. Finally, the assembly of the packaging box 100 as shown in FIG. 8 is completed by returning the box 30 that has been deformed to the parallelogram shape to a rectangular shape.

  Further, when the box body 30 is deformed into a parallelogram shape, the engagement piece 21 formed on the inner lid 10 is displaced from the engagement hole 23 of the side plate 1. At this time, as shown in FIG. 4, the engagement piece 21 is bent in a mountain shape along the fold line, so that the front end of the engagement piece 21 and the engagement hole 23 of the side plate 1 do not interfere with each other, and the box body 30 is made smooth. Can be transformed into

  The bottom plates 5 and 6 and the bottom flaps 7 and 8 (see FIG. 1) are engaged so as to be slidable in the horizontal direction. Accordingly, when the rectangular box 30 is deformed into a parallelogram or when the parallelogram box 30 is returned to a rectangular shape, the box 30 can be smoothly deformed.

  FIG. 9 is a plan view of the inside of the top surface of the packaging box 100 of FIG. As shown in FIG. 9, the second insertion piece 9b connected to one end of the first insertion piece 9a changes its angle from the bent state (see FIG. 7) due to the repulsive force (restoring force) of the sheet material. It arrange | positions in the position which does not overlap with the 2nd insertion hole 19b. On the other hand, the notch 9c formed at the other end of the first insertion piece 9a engages with the edge of the first insertion hole 19a by returning the parallelogram box 30 to a rectangular shape. That is, in a state where the assembly of the packaging box 100 is completed, both end portions of the first insertion piece 9a are engaged with the insertion hole 19, and the upper lid 9 and the inner lid 10 are locked.

  In order to release the locked state of the upper lid 9 and the inner lid 10, it is necessary to deform the rectangular box 30 again into a parallelogram and bend the second insertion piece 9b until it overlaps the second insertion hole 19b. is there. However, the second insertion piece 9 b inserted into the second insertion hole 19 b cannot be bent from the outside of the packaging box 100.

  Further, in the state where the assembly of the packaging box 100 is completed, the tip of the engagement piece 21 of the inner lid 10 is inserted into the engagement hole 23, and the edge 10 a of the inner lid 10 and the inner lid 10 of the lid flap 11. The edge 11a adjacent to is in a butted state. Further, as shown in FIG. 8, the protruding piece 25 protruding from the upper end of the side plate 4 is in contact with the side edge of the upper lid 9. Therefore, the rectangular box 30 cannot be easily transformed into a parallelogram. Therefore, it is impossible to open the packaging box 100 in the reverse order of assembly (packaging).

  When opening the packaging box 100, the grip portion 15 formed on the upper lid 9 is gripped, and the band-like portion 33 (hatched area in FIG. 8) between the first break line 13a and the second break line 13b is cut off. Then, the locked state of the upper lid 9 and the inner lid 10 is released. After the packaging box 100 is opened, the upper lid 9 can be held in a closed state by inserting the cover plate fixing piece 17 remaining on the upper lid 9 into the slit 20 of the inner lid 10.

  According to said structure, when opening the packaging box 100, it becomes necessary to cut off the strip | belt-shaped part 33 between the 1st broken line 13a and the 2nd broken line 13b. Thereby, it can be confirmed at a glance whether or not the packaging box 100 has been opened, and the extraction of the contents from the packaging box 100 can be easily found in the product distribution process.

  Further, since the upper lid 9 is not glued at the time of packaging, the number of members and the number of manufacturing steps can be reduced, and facilities such as a gluing device are not required, leading to cost reduction of the packaging box 100.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the present invention is not limited to the B type type in which the bottom surface is formed by engaging the pair of bottom plates 5 and 6 and the pair of bottom flaps 7 and 8, but the side plates connected to the four sides of the rectangular bottom plate It can be applied to packaging boxes of various assembling methods such as the A type type that is bent into two.

  Further, the butting structure of the engaging piece 21, the engaging hole 23, the protruding piece 25, and the inner lid 10 and the lid flap 11 is a preferable structure for restricting easy deformation of the packaging box 100. It is not an essential configuration for the invention. Furthermore, there are no particular restrictions on the size and shape of the first insertion piece 9a and the second insertion piece 9b, the angle of the second insertion hole 19b with respect to the first insertion hole 19a, and the like, and it is arbitrarily designed according to the specifications of the packaging box 100 can do.

  INDUSTRIAL APPLICABILITY The present invention can be used for a packaging box having an inner lid and an upper lid that are connected to the upper ends of opposing side plates. By using the present invention, it is possible to provide a packaging box having a simple configuration that is excellent in strength and airtightness, in which an open trace can be clearly recognized without the need for gluing at the time of packaging.

1-4 Side plate 5, 6 Bottom plate 7, 8 Bottom flap 9 Upper lid 9a First insertion piece 9b Second insertion piece 9c Cut 10 Inner lid 10a Edge 11, 12 Lid flap 13a First breaking line (opening means)
13b Second breaking line (opening means)
15 gripping part (opening means)
17 Lid plate fixing piece 19 Insertion hole 19a First insertion hole 19b Second insertion hole 20 Slit 21 Engagement piece 23 Engagement hole 25 Projection piece 30 Box 33 Band-like part 100 Packaging box

Claims (9)

It is composed of a bottom surface and side plates that are erected on the four sides of the bottom surface, and a box with an open top surface;
An upper lid connected to one side of the opening edge of the box via a fold line;
An inner lid that is connected to a side of the opening edge of the box that faces the side where the upper lid is extended via a fold line, and overlaps the inner side of the upper lid;
The first insertion piece comprises: a first insertion piece formed by bending the top end of the upper lid; and a second insertion piece connected to one side end of the first insertion piece via a folding line. An insertion piece provided with a cut between the other side end of the upper lid
A first insertion hole formed in the inner lid, into which the first insertion piece is inserted, and a second insertion hole into which the second insertion piece is inserted, being continuous with one end of the first insertion hole at a predetermined angle. An insertion hole consisting of
Opening means for separating the insertion piece from the upper lid;
Have
When the box is assembled in a rectangular shape in plan view, the first insertion hole is formed at a position shifted by a predetermined distance from the position facing the first insertion piece in the extending direction of the first insertion piece. The box is deformed into a parallelogram in plan view, and the insertion piece is inserted into the insertion hole in a state where the second insertion piece is bent, and the box is returned to a rectangular shape in plan view. Fixing the upper lid and the inner lid in a closed state ;
The inner lid is provided with an engagement piece projecting in the direction of the side plate connected to the upper lid from the other part of the inner lid, and when the box is assembled in a rectangular shape in plan view, The packaging box, wherein the engagement piece engages with an engagement hole provided in the side plate provided continuously with the upper lid . 2. The packaging box according to claim 1 , wherein a fold line extending in a direction substantially orthogonal to a protruding direction of the engagement piece is formed on the engagement piece . The upper lid and the inner lid of the box body are extended to an opening edge where the upper lid and the inner lid are not connected, and a pair of lid flaps are formed to overlap the inner side of the upper lid with the upper lid closed, and The packaging box according to claim 1 or 2, wherein when assembled in a rectangular shape, an end edge of at least one of the lid flaps is arranged in abutted state along an end edge of the inner lid . Of the side plates to which the lid flap is connected, the horizontal movement in the closed state of the upper lid is restricted to the upper end of the side plate that is closer to the upper lid when the insertion piece is inserted into the insertion hole. The packaging box according to any one of claims 1 to 3, wherein a protruding piece is formed . It is composed of a bottom surface and side plates that are erected on the four sides of the bottom surface, and a box with an open top surface;
An upper lid connected to one side of the opening edge of the box via a fold line;
An inner lid that is connected to a side of the opening edge of the box that faces the side where the upper lid is extended via a fold line, and overlaps the inner side of the upper lid;
The first insertion piece comprises: a first insertion piece formed by bending the top end of the upper lid; and a second insertion piece connected to one side end of the first insertion piece via a folding line. An insertion piece provided with a cut between the other side end of the upper lid
A first insertion hole formed in the inner lid, into which the first insertion piece is inserted, and a second insertion hole into which the second insertion piece is inserted, being continuous with one end of the first insertion hole at a predetermined angle. An insertion hole consisting of
Opening means for separating the insertion piece from the upper lid;
Have
When the box is assembled in a rectangular shape in plan view, the first insertion hole is formed at a position shifted by a predetermined distance from the position facing the first insertion piece in the extending direction of the first insertion piece. The box is deformed into a parallelogram in plan view, and the insertion piece is inserted into the insertion hole in a state where the second insertion piece is bent, and the box is returned to a rectangular shape in plan view. Fixing the upper lid and the inner lid in a closed state;
Of the side plates to which the lid flap is connected, the horizontal movement in the closed state of the upper lid is restricted to the upper end of the side plate that is closer to the upper lid when the insertion piece is inserted into the insertion hole. follicle Sobako you characterized in that the formation of the projecting piece.   The bottom surface includes a pair of bottom plates that are connected to two opposite sides of the opening edge of the box via a fold line, and a pair of bottoms that extend to an opening edge where the bottom plate of the box is not connected. 6. A flap according to claim 1, wherein the bottom plate and the bottom flap are slidable in a horizontal direction. Packaging box.   The packaging box according to any one of claims 1 to 6, wherein an angle formed by the first insertion hole and the second insertion hole is 90 degrees or less.   The unsealing means is composed of two break lines formed in the upper lid along the extending direction of the insertion piece, and a gripping part for cutting a band-shaped portion between the break lines. The packaging box according to any one of claims 1 to 7.   The upper lid has a lid plate fixing piece formed in a portion remaining after the strip-like portion is cut off, and the inner lid has a slit into which the lid plate fixing piece is inserted. The packaging box according to claim 8.

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