JP3223046U - Packaging box with lock function - Google Patents

Abstract

[PROBLEMS] To provide a packaging box with a lock function that has a simple structure and is easy to assemble and has a good appearance in an assembled state. An engagement piece 70 inside a second side plate 26 has a distal end portion 70a having a width β1 and a width β2 (<β1), and a second central portion on the proximal end side of the engagement piece 70. And a base end portion 70 b continuous with the side plate 26. The engagement piece receiving portion 54 of the insertion flap 50 includes a first cut line 54a extending in the width direction of the insertion flap 50 and two second extensions extending in the direction of the distal end portion of the insertion flap 50 from two intermediate points. And a first crease line 54c provided at a position connecting the ends of the two second cut lines 54b. The interval α1 between the two ends of the first cut line 54a is set to α1 ≧ β1, and the interval α2 between the two second cut lines 54b is set to β1> α2 ≧ β2. [Selection] Figure 2

Description

  The present invention relates to a packaging box with a locking function having a locking function for preventing the lid from being opened illegally.

  Conventionally, as disclosed in Patent Document 1, for example, a body portion including a front plate, a rear plate, and left and right side plates, a lid plate connected to an upper edge of the front plate, and a front end portion of the lid plate are provided. A packaging box in which the insertion flap can be inserted into the inner surface of the rear plate, and a tongue-like locking piece is provided at the end of the rear plate, and the inner side of the insertion flap. In addition, there is a packaging box in which a slit extending in the width direction of the insertion flap is provided, the upper end locking portion of the locking piece enters the slit and engages, and the lid portion is locked.

  The slit of the insertion flap is disposed at the center in the length direction (width direction of the insertion flap), and has a convex slit portion that protrudes toward the distal end side of the insertion flap, and both ends of the convex slit portion. A horizontal slit portion extending horizontally (parallel to the width direction of the insertion flap), and an oblique slit portion extending from both ends of the convex slit portion to an oblique tip side forming an acute angle with respect to the horizontal slit portion. . A horizontal slit part is a part which latches the upper end latching | locking part of the latching piece which entered in it, and prevents coming off.

  When the locking piece is inserted into the slit, first, the center of the tip of the locking piece enters the convex slit portion, and the gap gradually increases from the convex slit portion. The expansion of the gap is blocked by the oblique slit portion, and the gap of the horizontal slit portion does not become unnecessarily large. Therefore, after the upper end locking portion of the locking piece enters the horizontal slit portion, the horizontal slit portion is maintained in an appropriate gap, and the upper end locking portion is securely locked to the horizontal slit portion.

JP 2011-63288 A

  The packaging box of patent document 1 has a problem that it does not look good when viewed from the rear plate side in an assembled state. FIG. 7 shows a packaging box 1 shown in FIG. 7A as a packaging box described as Example 1 in Patent Document 1, and the insertion flap 3 is inserted into the inner surface side of the rear plate 2 and locked. When the piece 4 enters the slit 5 and engages, the state shown in FIGS. 7B and 7C is obtained.

  Here, assuming that the inner and outer portions separated by the convex slit portion 5a are P1 portion and P2 portion, respectively, and the central portion in the width direction of the locking piece 3 is P3 portion, these three portions are shown in FIG. As shown in (c), P1 part, P3 part, and P2 part overlap in this order. Then, they push each other in the thickness direction, the P1 part is curved outward, the P3 part and the P2 part are each curved inward, and unnatural unevenness is generated by the curvature of each part. For this reason, when the packaging box 1 is viewed from the rear plate 2 side, this unnatural unevenness (particularly, the curvature of the P1 portion) is easily noticeable and looks very bad.

  The present invention has been made in view of the above-described background art, and an object thereof is to provide a packaging box with a lock function that is easy to assemble with a simple structure and has a good appearance in an assembled state.

The present invention includes a plurality of side plates forming a cylindrical body, and a first side plate that extends from one end of the first side plate that is one of the plurality of side plates and faces the first side plate. A lid piece that closes one end of the cylindrical body without overlapping with the second side plate, an insertion flap that extends to the tip of the lid piece and is inserted into the inner surface side of the second side plate, A tongue-like engagement piece provided at the position where the insertion flap is inserted and overlapped inside the second side plate, and provided inside the insertion flap, and the engagement piece enters and engages An engaging piece receiving portion
The engagement piece has a distal end portion having a predetermined width and a proximal end portion that is narrower than the distal end portion and is continuous with the second side plate on the proximal end side of the engagement piece. ,
The engagement piece receiving portion includes a first cut line extending in the width direction of the insertion flap and two second cuts extending in the direction of the distal end portion of the insertion flap starting from two places in the middle of the first cut line. Two score lines,
The interval between the two end portions of the first cut line is set to be equal to or longer than the width of the tip portion of the engagement piece, and the interval between the two second cut lines is the engagement piece. A packaging box with a lock function that is shorter than the width of the distal end portion and set to be equal to or longer than the width of the base end portion of the engagement piece.

  Furthermore, the engagement piece receiving portion may have a first crease line provided at a position connecting the ends of the two second cut lines.

The present invention also includes a plurality of side plates that form a cylindrical body, and one end of a first side plate that is one of the plurality of side plates, facing the first side plate. A lid piece that closes one end of the cylindrical body without overlapping with the second side plate, an insertion flap that extends to the tip of the lid piece and is inserted into the inner surface side of the second side plate; A tongue-like engagement piece provided at a position where the insertion flap is inserted and overlapped inside the second side plate, and provided inside the insertion flap, and the engagement piece enters inside An engagement piece receiving portion to be engaged,
The engagement piece has a distal end portion having a predetermined width and a proximal end portion that is narrower than the distal end portion and that is linked to the second side plate on the proximal end side of the engagement piece. And
The engaging piece receiving portion includes a first cut line extending in a width direction of the insertion flap and a through hole extending in a width direction of the insertion flap, and the through hole is formed of the first cut line. In the center, it is arranged on the side of the front end of the insertion flap and continues to the first cut line,
The interval between the two ends of the first cut line is set to be equal to or longer than the width of the tip of the engagement piece, and the interval between the two ends of the through hole is the engagement. A packaging box with a lock function, which is shorter than the width of the distal end portion of the piece and set equal to or longer than the width of the base end portion of the engagement piece.

  A second crease line that crosses the base end portion in the width direction may be provided at the base end portion of the engagement piece. Moreover, the center part of said 1st cut line may be made into the shape bulged in the direction of the front-end | tip part of the said insertion flap. Further, the second side plate may be provided with an opening break line for separating the engagement piece from other portions.

  In the packaging box with a lock function of the present invention, when the engaging piece of the second side plate and the engaging piece receiving portion of the insertion flap are formed in a unique shape, the engaging piece is inserted into the engaging piece receiving portion. The engaging piece naturally tilts on the inner surface side of the insertion flap, and no large unevenness is generated on the surface of the insertion flap. Therefore, the appearance of the packaging box in the assembled state when viewed from the side of the second side plate is much better than the conventional packaging box. Further, the engagement strength between the engagement piece and the engagement piece receiving portion can be equal to or higher than that of the conventional art.

It is a perspective view which shows the assembly state of one Embodiment of the packaging box with a lock function of this invention. The development (a) which looked at the box formation piece which forms the packaging box with a lock function of this embodiment from the back side, figure (b) which expanded the engagement piece receiving part, figure (c) which expanded the engagement piece (c) ). It is a top view (a), (b), (c) which shows the assembly process of the packaging box with a lock function of this embodiment in order. It is a perspective view which shows the state before closing a cover part of the packaging box with a lock function of this embodiment. It is the front (a), (b), and (c) which show operation | movement when closing a cover part of the packaging box with a lock function of this embodiment in order. It is the front view (a) and (b) which show the cover part of an assembly state of the packaging box with a lock function of this embodiment, and AA sectional view (c). It is a figure which shows the cover part of the conventional packaging box, Comprising: The front view (a) which shows the state before closing a cover part, The front view (b) which shows the cover part of an assembly state, BB sectional drawing (c) ).

  Hereinafter, one embodiment of a packaging box with a lock function of the present invention is described based on FIGS. As shown in FIG. 1, the packaging box 10 with a lock function according to this embodiment is an elongated, substantially rectangular parallelepiped box, in which one end of a rectangular tube 12 is closed with a lid 14 having a unique structure, and the other end The part is closed by a bottom 16 called a so-called one-touch type.

  The packaging box with a lock function 10 is formed by assembling a single box forming piece 18 made of cardboard or the like. As shown in FIG. 2A, the box-forming piece 18 has four side plates 20, 22, 24, 26 connected in parallel to each other, and is divided by crease lines 28, 30, 32, respectively. Yes. The side plates 20, 22, 24, 26 have substantially the same length in the width direction perpendicular to the connecting direction, and the connecting direction lengths are almost equal to each other because the side plates 20, 24 are short. Long and almost equal to each other. Further, a gluing piece 34 is extended short at the end of the side plate 26 in the connecting direction, and is separated from the side plate 26 by a crease line 36. The gluing piece 34 is a portion that is glued to the back surface of the end portion of the side plate 20 in order to form the cylindrical body 12 with the four side plates 20, 22, 24, 26.

  Hereinafter, of the four side plates 20, 22, 24, 26, the upper end in FIG. 2A is referred to as a lid end, and the lower end is referred to as a bottom end. Further, the side plate 22 is referred to as a first side plate 22, and the side plate 26 is referred to as a second side plate 26.

  A substantially rectangular side flap 38 extends from the end of the side plate 20 on the lid side and is separated from the side plate 20 by a crease line 40. A trapezoidal bottom piece 42 with a narrowed tip is extended at the bottom end of the side plate 20, and is separated from the side plate 20 by a crease line 44. The bottom piece 42 is a portion that becomes a part of the one-touch type bottom portion 16, and the extension length from the crease line 44 is about 1/3 of the short side length of the first side plate 22.

A substantially rectangular lid piece 46 extends from the end of the first side plate 22 on the lid side and is separated from the first side plate 22 by a crease line 48. The extension length of the lid piece 46 is substantially the same as the length of the short side of the side plate 20. Further, an insertion flap 50 extends from the tip of the lid piece 46 and is separated from the lid piece 46 by a crease line 52. The insertion flap 50 has an extension length from the crease line 52 of about 1/8 of the length of the long side of the second side plate 26, and covers the area surrounded by the opening breaking line 70 described later. An engagement piece receiving portion 54 that engages with an engagement piece 70 (described later) is provided inside the insertion flap 50 that is set to a size that is possible. As shown in FIG. 2 (b), the engagement piece receiving portion 54 has a first cut line 54a extending in the width direction of the insertion flap 50 and two insertion points in the middle of the first cut line 54a. 50 has two second cut lines 54b extending in the direction of the front end portion, and a first crease line 54c provided at a position connecting the ends of the two second cut lines 54b. The first cut line 54a is formed in a shape bulging in an arc shape in the direction of the distal end portion of the insertion flap 50, and the interval between the two end portions is set to α1. The two second cut lines 54b are substantially parallel to each other, and the interval is set to α2.

  A substantially square bottom piece 56 extends from the bottom side end of the first side plate 22 and is separated from the first side plate 22 by a crease line 58. The bottom piece 56 is a portion that becomes a part of the one-touch type bottom portion 16, and the extension length from the crease line 58 is slightly shorter than the length of the short side of the side plate 20. A crease line 60 extending at an angle of about 45 degrees from one end of the crease line 58 is provided inside the bottom piece 56, and the bottom piece 56 is glued to a bottom surface portion 56 a continuous with the first side plate 22 and a small substantially triangular shape. It is divided into a part 56b.

  A substantially rectangular side flap 62 extends from the end of the side plate 24 on the lid side and is separated from the side plate 24 by a crease line 64. A trapezoidal bottom piece 66 having a narrowed tip is extended at the bottom end of the side plate 24 and separated from the side plate 24 by a crease line 68. The bottom piece 66 is a part that becomes a part of the one-touch type bottom part 16, and the extension length from the crease line 68 is about 1/3 of the length of the short side of the first side plate 22.

  Nothing is provided on the end side 26a on the lid side of the second side plate 26, and a tongue-like engagement piece is formed inside the second side plate 26 by a cut line extending from the end side 26a. 70 is provided. As shown in FIG. 2 (c), the engaging piece 70 has a width set to β1, a tip edge 70a whose tip edge bulges in an arc shape, and a width set to β2 (<β1). The base piece 70 has a base end portion 70 b continuous with the second side face plate 26 on the base end side. Further, the base end portion 70b is provided with a second crease line 70c that crosses the base end portion 70b in the width direction. Here, although the second crease line 70c has a form in which short cuts and connecting portions are alternately arranged, it may have a form like a groove in which the base material is linearly compressed.

  Further, an opening break line 72 for separating the engagement piece 70 (and its peripheral portion) from other portions is provided at the end of the second side plate 26 on the lid side. The breaking line 72 for opening is formed in a U-shape so as to surround the engaging piece 70 (and its peripheral part) starting from two places in the middle of the end side 26a.

  A substantially square bottom piece 74 extends from the bottom end of the second side plate 26 and is separated from the second side plate 26 by a crease line 76. The bottom piece 74 is a part that becomes a part of the one-touch type bottom portion 16, and the extension length from the crease line 76 is slightly shorter than the length of the short side of the side plate 20. A crease line 78 extending at an angle of about 45 degrees from one end of the crease line 76 is provided on the inner side of the bottom piece 74, and the bottom piece 74 is glued to a bottom surface portion 74 a continuous with the first side plate 22 and a small substantially triangular shape. It is divided into a portion 74b.

  Here, the relationship between the dimension of the engagement piece receiving part 54 and the dimension of the engagement piece 70 will be described. The distance α1 between the two ends of the first cut line 54a is the tip part 70a of the engagement piece 70. Is equal to or longer than the width β1 (α1 ≧ β1). The interval α2 between the two second cut lines 54b is shorter than the width β1 of the distal end portion 70a of the engagement piece 70, and is the same as or longer than the width β2 of the proximal end portion 70b (β1> α2 ≧ β2).

  Next, an example of the assembly method of the packaging box 10 with a lock function is demonstrated. Here, the folding method in which the front surface of the box-forming piece 18 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. 3A, the crease line 44 is folded forward and the bottom piece 42 is overlapped on the back surface of the side plate 20, and the crease line 58 is folded forward and the bottom piece 56 is put on the back surface of the first side plate 22. Then, the crease line 68 is forwardly folded and the bottom piece 66 is overlapped on the back surface of the side plate 24, and the crease line 76 is forwardly folded and the bottom piece 74 is overlapped on the back surface of the second side plate 26. Further, the crease line 78 is reversely folded, the glue portion 74b is overlapped on the bottom surface portion 74a, and the glue 80 is applied to the back surface of the glue portion 74b. Then, as shown in FIG. 3 (b), the crease line 32 is normally folded, the second side plate 26 and the glued piece 34 are overlaid on the back surfaces of the side plates 22 and 24, and the glued part 74 b is placed on the surface of the bottom piece 66. Glue to.

  Thereafter, the crease line 60 is reversely folded, the glue portion 56b is overlapped on the bottom surface portion 56a, and the glue 82 is applied to the back surface of the glue portion 56b and the surface of the glue piece 34. Then, as shown in FIG. 3C, the crease line 28 is normally folded, the side plate 20 is overlapped with the side plate 22, and the back surface of the end of the side plate 20 is glued to the glue piece 34, The surface is glued to the gluing part 56b. The box forming piece 18 is shipped from a manufacturing factory or the like of the packaging box 10 with a lock function in this folded state.

Next, three-dimensional assembly is performed in a factory or the like for packaging products. First, the crease lines 28, 30, 32, and 36 are each normally folded at 90 degrees. By this operation, the four side plates 20, 22, 24, 26 become the rectangular cylinder 12, and the first and second side plates 22, 26 face each other. Further, since the bottom piece 42 and the glued portion 56b are glued, and the bottom piece 66 and the glued portion 74b are glued, by performing the operation of forming the cylindrical body 12, the folded folding lines 60 and 78 are formed. The crease lines 44, 58, 68, and 76 are automatically automatically folded to 90 degrees, and the four bottom pieces 42, 56, 66, and 74 are tilted and overlapped to form the one-touch type bottom portion 16. As shown in FIG. 4, the bottom end of the cylindrical body 12 is closed and the end on the lid side is opened. Thereafter, a product or the like is inserted from the opening on the lid side and folded. The side flaps 38 and 62 are folded forward at 90 degrees along the ruled lines 40 and 64. Then, after the insertion flap 50 is normally folded at 90 degrees along the crease line 52, the crease line 48 is folded forward so that the lid piece 46 is overlaid on the side flaps 38 and 62, and the insertion flap 50 is moved to the second side plate. 22 and the engagement piece 70 is inserted into the engagement piece receiving portion 54.

  When the engaging piece 70 is inserted into the engaging piece receiving portion 54, as shown in FIGS. 5A to 5C in order, the distal end portion 70a of the engaging piece 70 is connected to the first cut line 54a. It inserts in from the outer surface side of the insertion flap 50. When the lid piece 46 is tilted to 90 degrees, the distal end portion 70a of the engagement piece 70 is entirely contained in the first cut line 54a, and the lid portion 12 that closes the lid-side end portion of the cylindrical body 12 is formed. Then, the assembled state shown in FIG. 1 and FIG.

  Next, the lid 12 in the assembled state will be described in detail with reference to FIGS. Here, the inner part (the part that bulges downward) of the insertion flap 50 delimited by the first cut line 54a is referred to as an inner part 50a, and the outer part delimited by the first cut line 54a. Is referred to as the outer portion 50b. Further, a tongue-like portion surrounded by the two second cut lines 54b and the first crease line 54c in the outer portion 50b is referred to as a tongue portion 84.

  In the assembled state, the distal end portion 70a of the engagement piece 70 passes through the first cut line 54a and is disposed on the inner side of the insertion flap 50, and the left and right protruding portions of the distal end portion 70a are at both ends of the first cut line 54a. It is firmly engaged with the part to prevent it from coming off. Moreover, the base end part 70b of the engagement piece 70 is arrange | positioned so that it may be settled between the two 2nd cut lines 54b, as shown in FIG.6 (b). As shown in FIG. 6C, the inner portion 50a, the outer portion 50a, and the engagement piece 70 of the insertion flap 50 are overlapped in this order.

  In the process in which the engagement piece 70 is inserted into the engagement piece receiving portion 54, the inner portion 50a presses the engagement piece 70 (front end portion 70a) inward, and the engagement piece 70 (base end portion 70b). Presses the outer portion 50b inward, so that the first crease line 54c automatically folds, the tongue 84 tilts inward, and the engagement piece 70 tilts naturally inward. As a result, the repulsive force by which the engagement piece 70 pushes back the inner portion 50a is weakened. In the assembled state, the inner portion 50a is held in a substantially flat state, and no large unevenness is generated on the surface.

  Note that the second crease line 70c of the base end portion 70b of the engagement piece 70 is a crease line for making the operation of tilting the engagement piece 70 inward more smoothly performed. The second crease line 70c may be omitted if not necessary.

  When the packaging box 10 with a lock function is forced to pull up the lid piece 46, some trace remains in the engaging piece receiving portion 54 or the engaging piece 70, and therefore it is difficult to open it illegally. When opening normally, the area surrounded by the opening breaking line 72 of the second side plate 26 is pushed with a finger to break the opening breaking line 72, and the engagement piece 70 (and its peripheral part) is otherwise Separate from the part. As a result, the fixing between the insertion flap 50 and the second side plate 26 is released, and the lid portion 14 can be opened by causing the lid piece 46 and the side flaps 38 and 62 in order, and the product etc. inside is taken out. be able to.

  As described above, in the packaging box 10 with the lock function, the engagement piece 70 of the second side plate 26 and the engagement piece receiving portion 54 of the insertion flap 50 are formed in a unique shape, and the engagement piece 70 is engaged. When inserted into the mating piece receiving portion 54, the engagement piece 70 is naturally tilted on the inner surface side of the insertion flap 50, and no large unevenness is generated on the surface of the insertion flap 50. Therefore, the appearance of the packaging box 10 in the assembled state when viewed from the second side plate 26 side is much better than the conventional packaging box. Further, the engagement strength between the engagement piece 70 and the engagement piece receiving portion 54 can be made equal to or higher than that of the related art.

  In addition, the packaging box with a lock function of this invention is not limited to the said embodiment. For example, you may change the area | region of the tongue part 84 of the said packaging box 10 with a lock function into a through-hole. Even when it is changed to a through hole, the same effect as described above can be obtained.

  The first cut line of the engagement piece receiving portion may be a cut line extending in the width direction of the insertion flap, and can be laid out in a straight line or a curved line. However, considering the ease of insertion of the engagement piece, the shape of the central portion of the first cut line is preferably a shape that bulges in the direction of the tip of the insertion flap, U-shape, V-shape, etc. can be selected freely. Moreover, the shape of the both ends of a 1st cut line can be suitably changed in consideration of the engagement strength with an engagement piece. Therefore, although the first cut line 54a has a central portion and both ends continuous in an arc shape with the same radius of curvature, both ends can be extended to different angles.

  The two second cut lines 54b are arranged in parallel to each other, but may not be in parallel as long as the intended operation of the present invention is possible. Further, the first crease line 54c is in the form of a groove formed by linearly compressing the base material, but in the same manner as the second crease line 70c, a form in which short cuts and connecting portions are alternately arranged. Alternatively, it may not be provided depending on the length of the second cut line, the thickness of the box forming piece 18, and the like.

  The breaking line for opening the second side plate may be any layout as long as it is laid out so that the engaging piece can be separated from the other parts at the time of opening, and is changed to a form different from the U-shaped breaking line for opening 72. May be. Further, the breaking line for opening may be omitted if not necessary.

  In addition, the number, size and shape of the side plates forming the cylinder, the structure of the bottom, and the like can be freely changed.

DESCRIPTION OF SYMBOLS 10 Packaging box 12 with a lock function Cylindrical body 20, 24 Side plate 22 First side plate 26 Second side plate 46 Cover piece 50 Inserting flap 54 Engagement piece receiving part 54a First cut line 54b Second cut line 54c First crease line 70 Engagement piece 70a Front end part 70b Base end part 70c Second crease line 72 Breaking line for opening

Claims (6)

A plurality of side plates forming a cylindrical body, and a second side plate extending to one end of the first side plate which is one of the plurality of side plates and facing the first side plate A lid piece that closes one end of the cylindrical body without overlapping, a plug flap that extends to the tip of the lid piece and is inserted into the inner surface side of the second side plate, and the second side plate A tongue-shaped engagement piece provided at a position where the insertion flap overlaps with the insertion flap, and an engagement piece provided on the inner side of the insertion flap and engaged with the engagement piece inside A receiving part,
The engagement piece has a distal end portion having a predetermined width and a proximal end portion that is narrower than the distal end portion and is continuous with the second side plate on the proximal end side of the engagement piece. ,
The engagement piece receiving portion includes a first cut line extending in the width direction of the insertion flap and two second cuts extending in the direction of the distal end portion of the insertion flap starting from two places in the middle of the first cut line. Two score lines,
The interval between the two end portions of the first cut line is set to be equal to or longer than the width of the tip portion of the engagement piece, and the interval between the two second cut lines is the engagement piece. A packaging box with a lock function, wherein the packaging box is shorter than the width of the distal end portion and set to be equal to or longer than the width of the base end portion of the engagement piece.   2. The packaging box with a lock function according to claim 1, wherein the engagement piece receiving portion has a first crease line provided at a position connecting the ends of the two second cut lines. A plurality of side plates forming a cylindrical body, and a second side plate extending to one end of the first side plate which is one of the plurality of side plates and facing the first side plate A lid piece that closes one end of the cylindrical body without overlapping, a plug flap that extends to the tip of the lid piece and is inserted into the inner surface side of the second side plate, and the second side plate A tongue-shaped engagement piece provided at a position where the insertion flap overlaps with the insertion flap, and an engagement piece provided on the inner side of the insertion flap and engaged with the engagement piece inside A receiving part,
The engagement piece has a distal end portion having a predetermined width and a proximal end portion that is narrower than the distal end portion and is continuous with the second side plate on the proximal end side of the engagement piece. ,
The engaging piece receiving portion includes a first cut line extending in a width direction of the insertion flap and a through hole extending in a width direction of the insertion flap, and the through hole is formed of the first cut line. In the center, it is arranged on the side of the front end of the insertion flap and continues to the first cut line,
The interval between the two ends of the first cut line is set to be equal to or longer than the width of the tip of the engagement piece, and the interval between the two ends of the through hole is the engagement. A packaging box with a lock function, characterized in that it is shorter than the width of the distal end portion of the piece and set to be equal to or longer than the width of the base end portion of the engagement piece.   The packaging box with a lock function according to claim 1, 2, or 3, wherein a second crease line that crosses the base end portion in the width direction is provided at the base end portion of the engagement piece.   The packaging function-equipped packaging box according to any one of claims 1 to 4, wherein a central portion of the first cut line is formed in a shape bulging in a direction of a distal end portion of the insertion flap.   The packaging box with a lock function according to any one of claims 1 to 5, wherein the second side plate is provided with a breaking line for opening to separate the engaging piece from other portions.

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