Packing box

Abstract

To prevent the number of components from being increased, and to simplify a structure with regard to a packing box capable of suppressing unintentional unlocking caused by bending of a box body.SOLUTION: A packing box 1 comprises: a box body 10 provided with a cylindrical outer-peripheral wall 11 and a closure wall 20; a lid body 40 comprising a lid body part 41, a front plate part 43, and a side plate part 44; a lock part 50 for locking the lid body 40 to the box body 10 in an openable manner; a front flap 26 continuously provided at an edge on the lid body 40 side of a front plate 14; a side flap 27 continuously provided at an edge on the lid body 40 side of a side plate 15; a front folding piece 30 folded on the closure wall 20 side, which is continuously provided at an edge on the side flap 27 side of the front flap 26; and a side folding piece 31 coming into contact with the front folding piece 30, which is continuously provided at an edge on the front flap 26 side of the side flap 27 and is folded on the closure wall 20 side.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a packaging box.

Background Art

[0002] The packaging box disclosed in Patent Document 1 includes a box body having a bottomed rectangular tubular shape and a lid body that closes the opening of the box body in an openable manner. The lid body includes a frame wall portion that is disposed so as to overlap the outside of the outer peripheral wall of the box body, and is provided separately from the box body or is continuously provided to one of a plurality of side plates constituting the outer peripheral wall of the box body. A locking portion for locking the lid body to the box body in an openable manner is formed on the outer peripheral wall of the box body and the frame wall portion of the lid body.

[0003] Patent Document 2 discloses a space retainer used for the lid body of a packaging box. This space retainer is separate from the lid body and protrudes in a V shape from the lid main body portion by being disposed inside the lid body. Further, the space retainer can enter the upper part of the box body by closing the opening of the box body with the lid body, and can suppress the inward deflection of the outer peripheral wall of the box body.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the packaging box of Patent Document 1, since the outer peripheral wall of the box body is deflected inward by an external force, the lock by the locking portion may be released unintentionally, and the lid body may be opened. If the space retainer of Patent Document 2 is applied to the lid body of Patent Document 1 and the deflection of the outer peripheral wall of the box body is suppressed by the space retainer, the unintentional unlocking due to the deflection can be suppressed. However, in this case, there is a disadvantage that the number of parts constituting the packaging box increases and the structure becomes complicated.

[0006] The present invention relates to a packaging box capable of suppressing unintentional unlocking due to bending of a box body, and an object thereof is to prevent an increase in the number of parts and simplify the structure.

Means for Solving the Problem

[0007] The present invention includes a cylindrical outer peripheral wall including a front plate and side plates continuous with the front plate, and a box body having a closing wall continuous with a first end in the axial direction of the outer peripheral wall and closing an opening at the first end, a lid body portion disposed at a second end in the axial direction of the outer peripheral wall, a front plate portion continuous with the lid body portion and disposed overlapping the outside of the front plate, and side plate portions continuous with the lid body portion and the front plate portion respectively and disposed overlapping the outside of the side plates, a lid for openably closing an opening at the second end of the outer peripheral wall, a locking portion formed on the front plate and the front plate portion or on the side plates and the side plate portions for openably locking the lid to the box body, a front flap continuously provided at an edge of the front plate on the lid side and extending along the lid body portion, a side flap continuously provided at an edge of the side plate on the lid side and extending along the lid body portion, a front folding piece continuously provided at an edge of the front flap on the side flap side and folded toward the closing wall side, and a side folding piece continuously provided at an edge of the side flap on the front flap side and folded toward the closing wall side to abut against the front folding piece, and provides a packaging box.

[0008] The box body includes a front flap continuously provided on the front plate and side flaps continuously provided on the side plates, and folding pieces abutting against each other are continuously provided thereon. Thereby, when an external force is applied to the front plate of the box body, the front folding piece abuts against the side folding piece, and the deflection of the front plate can be suppressed by the tension of the side flap. On the other hand, when an external force is applied to the side plate of the box body, the side folding piece abuts against the front folding piece, and the deflection of the side plate can be suppressed by the tension of the front flap. Therefore, it is possible to suppress the unlocking of the locking portion of the box body and the lid due to deflection, and to suppress the unintentional opening of the lid.

[0009] The flaps for suppressing deflection are respectively connected to the front plate and the side plates, and the folding pieces are respectively connected to the flaps, so that an increase in the number of component parts constituting the packaging box can be prevented and the structure can be simplified. Moreover, while bending the front flap with respect to the front plate and the side flap with respect to the side plate, at the same time, while bending the front folding piece with respect to the front flap and the side folding piece with respect to the side flap, a reinforcing wall can be assembled. Therefore, the assembly workability can be improved as compared with the case where a space holder made of a separate member is used for the lid body.

Advantages of the Invention

[0010] The present invention relates to a packaging box capable of suppressing unintentional unlocking due to deflection of the box body, and it is possible to prevent an increase in the number of parts and simplify the structure.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Best Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0013] (First Embodiment) Referring to FIGS. 1 and 2, the packaging box 1 according to the first embodiment of the present invention includes a box body 10 having an integral structure and a lid 40, and houses a large number of small articles.

[0014] In the attached drawings, the X direction is the front-rear direction of the packaging box 1, the direction indicated by the arrow is the front side, and the direction opposite to the arrow is the rear side. The Y direction is the left-right direction (width direction) of the packaging box 1, the direction indicated by the arrow is the left side, and the direction opposite to the arrow is the right side. The Z direction is the up-down direction (height direction) of the packaging box 1, the direction indicated by the arrow is the upper side, and the direction opposite to the arrow is the lower side.

[0015] The dimension of the packaging box 10 in the front-rear direction is smaller than either the dimension of the packaging box 10 in the left-right direction or the dimension of the packaging box 10 in the up-down direction. The dimension of the packaging box 10 in the left-right direction is larger than the dimension of the packaging box 10 in the up-down direction. However, the dimensions in the front-rear direction, left-right direction, and up-down direction of the packaging box 10 can be changed according to the articles to be housed.

[0016] The packaging box 10 is formed by bending and adhering a single blank shown in FIG. 5 at predetermined portions. The blank is formed by punching a paper corrugated board sheet with a well-known paper punching device. The corrugated board sheet has a configuration in which a corrugated middle liner is disposed between a surface liner (the outer surface side of the packaging box 1) and a back liner (the inner surface side of the packaging box 1).

[0017] The portion described by the dashed-dotted line in FIG. 5 is a general-purpose ruled line formed by ruling from the back liner so as to compress the thickness. The portion shown by the solid line in FIG. 5 is a cutting line formed by cutting from the back liner to the surface liner and a shape line (side) by punching. The portion described by the broken line in FIG. 5 is a half-cut line formed by cutting from the back liner to half of the thickness of the corrugated board sheet.

[0018] Referring to FIGS. 1 and 2, the box body 10 of the packing box 1 is a bottomed polygonal cylindrical shape having an outer peripheral wall 11 and a bottom wall (closing wall) 20. The lid body 40 having an integral structure with the box body 10 can openably close the upper end opening (opening of the second end) 12 defined at the upper end (the other end in the axial direction) of the outer peripheral wall 11 of the box body 10. A locking portion 50 for maintaining them in the closed state shown in FIG. 1 is formed on the box body 10 and the lid body 40. Further, a reinforcing wall 25 for suppressing the deflection of the outer peripheral wall 11 is integrally provided on the box body 10.

[0019] Hereinafter, the configurations of the box body 10, the lid body 40, and the locking portion 50 will be specifically described.

[0020] (Configuration of the box body) Referring to FIGS. 1 and 2, the outer peripheral wall 11 of the box body 10 is in a square cylindrical shape and includes a front plate 14, a pair of side plates 15, and a rear plate 16. The front plate 14, the pair of side plates 15, and the pair of side plates 15 and the rear plate 16 are respectively connected via bent portions 19 extending in the vertical direction. Hereinafter, among the pair of side plates 15, the one located on the left side in FIG. 2 may be referred to as the left side plate 15, and the one located on the right side in FIG. 2 may be referred to as the right side plate 15.

[0021] The front plate 14 is a square-shaped portion located in the front in FIGS. 1 and 2 and extends along the YZ plane. The pair of side plates 15 have the same square shape and are respectively connected to the left and right edges of the front plate 14 so as to face each other at intervals in the width direction, and each extends along the XZ plane. The rear plate 16 has the same square shape as the front plate 14, is connected to the rear ends of the pair of side plates 15 so as to face the rear side of the front plate 14 at intervals, and extends along the YZ plane. Among them, the dimension in the front-rear direction of the side plate 15, that is, the depth of the packing box 1, is set to an interval that an adult can grasp with one hand (for example, 95 mm). Further, the right side plate 15 is composed of a side plate body 17 connected to the front plate 14 and an attachment 18 connected to the rear plate 16, and is adhered by an adhesive (for example, hot melt).

[0022] Referring to Fig. 5, the auxiliary plate 18, the rear plate 16, the left side plate 15, the front plate 14, and the side plate body 17 are connected in series from left to right in this order. Between the rear plate 16 and the left side plate 15, between the left side plate 15 and the front plate 14, and between the front plate 14 and the side plate body 17, a bending line 19a forming a bent portion 19 is formed. Between the auxiliary plate 18 and the rear plate 16, a bending line 19b forming a bent portion 19 is formed. The bending line 19a is constituted by a general-purpose ruled line, and the bending line 19b is constituted by a half-cut lead ruled line. The half-cut lead ruled line is configured to have a plurality of cutting lines provided at intervals on a half-cut line.

[0023] Referring to Figs. 1 and 3, the bottom wall 20 is in a rectangular shape extending along the XY plane and closes a lower end opening (opening of the first end) 13 defined at the lower end (one axial end) of the outer peripheral wall 11. The bottom wall 20 is constituted by a pair of short flaps 21 and long flaps 22 respectively. The pair of short flaps 21 are trapezoidal and are respectively connected to the pair of side plates 15 via a bent portion 23. The pair of long flaps 22 are in an elongated trapezoidal shape and are respectively connected to the front plate 14 and the rear plate 16 via a bent portion 24. The protruding dimension of each long flap 22 in the front-rear direction is approximately smaller than the dimension of the lower end opening 13 of the outer peripheral wall 11 in the front-rear direction by the interval of the thickness of one cardboard sheet.

[0024] Referring to Fig. 5, the pair of short flaps 21 are respectively connected to the lower ends of the left side plate 15 and the side plate body 17 via a bending line 23a forming a bent portion 23. The pair of long flaps 22 are respectively connected to the lower ends of the front plate 14 and the rear plate 16 via a bending line 24a forming a bent portion 24. Both the bending lines 23a and 24a are constituted by general-purpose ruled lines. In the blank state shown in Fig. 5, the protruding ends of the short flaps 21 and the protruding ends of the long flaps 22 are located on the same straight line.

[0025] Referring to FIGS. 2 to 4, the reinforcing wall 25 reinforces the upper end of the box body 10 and suppresses the deflection of the front plate 14, the pair of side plates 15, and the rear plate 16 due to external forces. The reinforcing wall 25 includes one front flap 26 and a pair of side flaps 27. The front flap 26 and the individual side flaps 27 are connected to each other via a pair of folding pieces 30, 31. These specific configurations will be described in detail later.

[0026] (Configuration of the lid body) Referring to FIGS. 1 to 3, the lid body 40 includes a lid main body portion 41 that closes the upper end opening 12 of the box body 10. The lid body 40 also includes a frame wall portion 42 formed by a front plate portion 43 and a pair of side plate portions 44.

[0027] The lid main body portion 41 is connected to the upper end of the rear plate 16 of the box body 10 via a bent portion 45 and is rotatable about the bent portion 45. The lid main body portion 41 has a rectangular shape that is slightly larger than the bottom wall 20, and in the closed state shown in FIGS. 1, 3, and 4, it is disposed on top of the flaps 26, 27 that are the upper ends of the outer peripheral wall 11 of the box body 10. More specifically, the width dimension of the lid main body portion 41 in the left-right direction is approximately larger than the width dimension of the box body 10 by the thickness of two cardboard sheets. The dimension of the lid main body portion 41 in the front-rear direction is approximately larger than the dimension of the box body 10 in the front-rear direction by the thickness of two cardboard sheets.

[0028] The front plate portion 43 that constitutes the frame wall portion 42 has an elongated rectangular shape in the width direction and is connected to the front edge of the lid main body portion 41 via a bent portion 46. The front plate portion 43 is disposed on the outside of the front plate 14 of the box body 10 in the closed state shown in FIGS. 1, 3, and 4 and extends along the YZ plane. The width dimension of the front plate portion 43 including the pair of sticking pieces 48, which will be described in detail later, is approximately larger than the width dimension of the front plate 14 by the thickness of two cardboard sheets. The height dimension of the front plate portion 43 including the sticking pieces 48 in the up-down direction is much smaller than the height dimension of the front plate 14 in the up-down direction and is set as large as possible without interfering with the opening and closing of the lid body 40 with respect to the box body 10.

[0029] Each of the pair of side plate portions 44 constituting the frame wall portion 42 has an elongated shape in the front-rear direction, is connected to both side edges of the lid main body portion 41 via the bent portion 47, and is connected to the front plate portion 43 via the sticking piece 48. The pair of side plate portions 44 are arranged so as to overlap the outer sides of the corresponding side plates 15 of the box main body 10 in the closed state shown in FIGS. 1 and 4, and extend along the XZ plane. The dimension of each side plate portion 44 in the front-rear direction is approximately larger than the dimension of the side plate 15 in the front-rear direction by the thickness of one corrugated cardboard sheet. The height dimension of each side plate portion 44 in the vertical direction is much smaller than the height dimension of the side plate 15, and is set to be the same as the height dimension of the front plate portion 43. However, the height dimension of the side plate portion 44 may be different from the height dimension of the front plate portion 43 and can be changed as needed. In the following description, of the pair of side plate portions 44, the one located on the left side in FIG. 2 may be referred to as the left side plate portion 44, and the one located on the right side in FIG. 2 may be referred to as the right side plate portion 44.

[0030] Referring to FIGS. 2 to 4, the pair of sticking pieces 48 have an elongated shape in the width direction and are connected to the front edges of the side plate portions 44 via the bent portion 49. The pair of sticking pieces 48 are stuck to the inner surface of the front plate portion 43 with an adhesive (for example, hot melt). That is, the pair of sticking pieces 48 can be regarded as constituting a part of the front plate portion 43. The width dimension of each sticking piece 48 in the left-right direction is smaller than half of the width dimension of the front plate portion 43, and a gap through which the operation portion 55 to be described in detail later can be inserted is set between the pair of sticking pieces 48. The height dimension of each sticking piece 48 in the vertical direction is smaller than the height dimension of the front plate portion 43, and is set to a size that can maintain the connection state between the front plate portion 43 and the side plate portion 44 without being easily broken by an external force. Referring to FIG. 5, the pair of sticking pieces 48 are connected to the upper ends of the pair of side plate portions 44 via the bent line 49a constituting the bent portion 49. The bent line 49a is constituted by a general-purpose ruled line.

[0031] (Configuration of the locking portion) Referring to FIGS. 2 to 4, the locking portion 50 includes a locking piece 51 and a locking receiving portion 54 to which the locking piece 51 can be locked, and locks the lid 40 so that it is difficult to open with respect to the box body 10. Further, an operating portion 55 for releasing the lock by the locking portion 50 is provided on the lid 40.

[0032] The locking piece 51 has an inverted trapezoidal shape, is continuous with the front edge of the front flap 26 of the box body 10 via a bent portion 52, and extends along the front plate 14. The locking piece 51 and the front plate 14 are separated by a slit 53 penetrating in the front-rear direction. The slit 53 is generally U-shaped and extends downward along the locking piece 51. Both ends of the slit 53 are located on the bent portions 52 and 28 which are the upper ends of the locking piece 51 and the front plate 14 respectively. The locking piece 51 configured in this way can be elastically displaced outward with respect to the front plate 14 around the bent portion 52 by the waist (rigidity) of the cardboard sheet. Referring to FIG. 5, the locking piece 51 is continuous with the lower edge of the front flap 26 via a bending line 52a forming the bent portion 52. The bending line 52a is formed by a general-purpose ruled line.

[0033] Referring to FIGS. 2 to 4, the locking receiving portion 54 is provided on the front plate portion 43 of the lid 40 so as to correspond to the locking piece 51, and receives the locking of the locking piece 51. The locking receiving portion 54 is formed by notches provided in a pair of adhering pieces 48 which are a part of the front plate portion 43. This locking receiving portion 54 includes an inclined edge 54a extending downward from the lid main body portion 41, and a locking edge 54b continuous with the lower end of the inclined edge 54a and extending toward the center side of the front plate portion 43 in the left-right direction. The lower edge of the locking piece 51 displaced outward is locked to the locking edge 54b. Thereby, the rotation of the lid 40 from the closed state shown in FIG. 1 to the open state shown in FIG. 2 can be restricted, and the lid 40 can be locked.

[0034] The operation unit 55 is provided on the front plate portion 43 of the lid body 40 so as to be located between a pair of sticking pieces 48 which are outside the locking piece 51. The operation unit 55 is partitioned and provided in the front plate portion 43 by a U-shaped cutting line 55a and a bending line 55b extending in the left-right direction between both ends of the cutting line 55a. Referring to FIGS. 3 and 6, the operation unit 55 can be bent along the bending line 55b and pushed inward by being pressed from the outside inward. By pushing in the operation unit 55, the locking piece 51 is pushed inward, so that the locking of the locking piece 51 to the lock receiving portion 54 is released. As a result, the rotation restriction of the lid body 40 from the closed state shown in FIG. 1 to the open state shown in FIG. 2 is released, and the lock of the lid body 40 can be released. A plurality of continuous portions (non-cut portions) are provided at intervals on the cutting line 55a. When other members interfere with the operation unit 55 during transportation, it is preferable to suppress the operation unit 55 from being easily pushed in and to suppress the release of the lock of the lock portion 50.

[0035] In the closed state shown in FIGS. 1, 3, and 4, when the outer peripheral wall 11 of the box body 10 bends inward, the locking piece 51 is displaced inward in conjunction therewith, and the locking of the locking piece 51 to the lock receiving portion 54 is released, so that the lid body 40 can be opened. In order to suppress the bending of the outer peripheral wall 11 and suppress the unintended opening of the lid body 40 due to the suppression of the bending, a reinforcing wall 25 is provided on the box body 10 of the present embodiment.

[0036] (Configuration of Reinforcing Wall) Referring to FIGS. 2 to 4, the reinforcing wall 25 includes a front flap 26 and a pair of side flaps 27, and reinforces the upper end of the box body 10 to suppress the bending of the outer peripheral wall 11 including the lid body 40. Front folding pieces 30 are continuously provided on both side edges of the front flap 26, side folding pieces 31 are continuously provided on the front side edges of the pair of side flaps 27, and the adjacent front folding pieces 30 and side folding pieces 31 are continuously provided with each other.

[0037] The front flap 26 is connected to the upper edge of the front plate 14 via a bent portion 28 and extends along the lid body portion 41 of the lid 40. The bent portion 28 extends in a straight line with respect to the bent portion 52 of the locking piece 51. The leading edge of the front flap 26 facing the rear wall 16 is formed in a wavy shape repeating arcuate unevenness in this embodiment. However, the shape of the leading edge of the front flap 26 may be linear and can be changed as necessary.

[0038] Referring to FIG. 5, the front flap 26 is connected to the upper edge of the front plate 14 via a bending line 28a forming the bent portion 28. The bending line 28a is not provided between the locking pieces 51 and extends in a straight line with respect to the bending line 52a between both ends of the slit 53. The bending line 28a is constituted by a half-cut lead line similar to the bending line 19b.

[0039] Referring to FIGS. 2 to 4, the side flaps 27 are connected to the upper edge of the side plates 15 via bent portions 29 and extend along the lid body portion 41 of the lid 40. The front edge of the side flap 27 abuts against the side edge of the adjacent front flap 26. If the total length of the side flap 27 in the front-rear direction is made excessively short, the rigidity against a backward external force with respect to the front plate 14 becomes weak. Therefore, it is preferable to set the total length of the side flap 27 to be half or more of the dimension of the side plate 15 in the front-rear direction. In this embodiment, the total length of the side flap 27 is set such that the rear edge of the side flap 27 is positioned at the smallest possible interval within a range that does not interfere with the rotation of the lid 40 with respect to the adjacent rear plate 16.

[0040] The leading edges of the pair of side flaps 27 facing each other are formed in a wavy shape repeating arcuate unevenness in this embodiment. However, the shape of the leading edge of the side flap 27 may be linear and can be changed as necessary. In the following description, of the pair of side flaps 27, the one located on the left side in FIG. 2 may be referred to as the left side flap 27, and the one located on the right side in FIG. 2 may be referred to as the right side flap 27.

[0041] Referring to FIG. 5, the side flap 27 is connected to the upper edge of the side plate 15 via a folding line 29a that constitutes a bent portion 29. The folding line 29a is constituted by a half-cut lead grid similar to the folding line 19b. In the blank state, the left flap 27 located on the right side in FIG. 5 is adjacent to and continuous with the left side plate portion 44 of the lid body 40. Therefore, a cutting line 35 for separating them is provided between the left flap 27 and the left side plate portion 44. The shape of the cutting line 35 corresponds to the shape of the leading edge of the side flap 27. The leading edge of the right side plate portion 44 located on the left side in FIG. 5 is formed in a shape symmetrical to the leading edge of the left side plate portion 44.

[0042] Referring to FIG. 2, the widest portion in the front-rear direction of the front flap 26 is set to a width W1 that is narrower than the width in the front-rear direction of the box body 10. The widest portion in the left-right direction of the side flap 27 is set to a width W2 that is much narrower than the width in the left-right direction of the box body 10. If the widths W1 and W2 of the flaps 26 and 27 are made too wide, the area covering the upper end opening 12 becomes larger, so the usability of taking out the articles in the box body 10 is impaired. On the other hand, if the widths W1 and W2 of the flaps 26 and 27 are made too narrow, the rigidity of the flaps 26 and 27 is insufficient, so the suppression of the deflection of the outer peripheral wall 11 by an external force may become insufficient, and the foldability of the flaps 26 and 27 with respect to the front plate 14 and the side plates 15 may deteriorate. Therefore, when the width in the front-rear direction of the box body 10 is 95 mm, it is preferable to set the widths W1 and W2 of the flaps 26 and 27 to be 10 mm or more and 30 mm or less, and in this embodiment, they are set to 25 mm.

[0043] Referring to FIGS. 2 to 4, the pair of front folding pieces 30 are connected to both side edges that are the edges on the side flap 27 side of the front flap 26 via folding portions 32, respectively, and are folded toward the bottom wall 20 side. Each front folding piece 30 has a right-angled triangular shape. The folding portion 32 extends from the corner of the front flap 26 where the side flap 27 abuts, toward the center side of the box body 10 at an inclination angle of 45 degrees. However, the shape of the front folding piece 30 and the inclination angle of the folding portion 32 can be changed as necessary. Also, the folding portion 32 is not limited to a straight line and may be curved.

[0044] The pair of side folding pieces 31 are connected to the front edges, which are the edges on the front flap 26 side of the pair of side flaps 27, via folding portions 33 respectively, and are folded toward the bottom wall 20 side. Each of the individual side folding pieces 31 has a right-angled triangular shape symmetrical to the front folding piece 30. The folding portion 33 extends from the corner of the side flap 27 against which the front flap 26 abuts, toward the center side of the box body 10 at an inclination angle of 45 degrees. However, the shape of the side folding piece 31 and the inclination angle of the folding portion 33 can be changed as required. Further, the folding portion 33 is not limited to a straight line and may be curved.

[0045] Among the pair of front folding pieces 30 and the pair of side folding pieces 31 configured in this way, a set of adjacent folding pieces 30, 31 are in surface contact with each other by the stiffness of the cardboard sheet. Also, one side on the front plate 14 side of the front folding piece 30 and one side on the side plate 15 side of the side folding piece 31 are connected via a folding portion 34.

[0046] Referring to FIG. 5, the pair of front folding pieces 30 are connected to both sides of the front flap 26 via folding curves 32a that constitute the folding portion 32 respectively. The pair of side folding pieces 31 are connected to the front flap 26 side of the pair of side flaps 27 via folding curves 33a that constitute the folding portion 33 so as to be adjacent to the front folding pieces 30 respectively. The folding curves 32a, 33a are constituted by half-cut lead ruled lines similar to the folding curve 19b. Also, the folding curves 32a, 33a extend at an inclination angle of 45 degrees so as to be separated from each other from the intersection points of the folding curves 19a, 28a, 29a.

[0047] Continuing to refer to FIG. 5, a folding curve 34a that constitutes the folding portion 34 is formed between the front folding piece 30 and the side folding piece 31. The folding curve 34a is constituted by a lead ruled line provided with a cutting line on a general ruled line. Also, the folding curve 34a extends on the same straight line as the folding curve 19a.

[0048] Next, an example of the usage method of the packaging box 1 configured in this way will be described.

[0049] The packaging box 1 is delivered to the article manufacturer in the blank state shown in FIG. 5 and assembled by a dedicated box-making machine (not shown) in a state where the reinforcing wall 25 is not bent in FIG. 2 (not shown).

[0050] Subsequently, after accommodating the article into the box body 10 from the opened upper end, the reinforcing wall 25 is bent with respect to the outer peripheral wall 11. Specifically, the front flap 26 is bent inward with respect to the front plate 14, and at the same time, the pair of side flaps 27 are bent inward with respect to the pair of side plates 15, respectively. At this time, further simultaneously, the front folding piece 30 is bent downward with respect to the front flap 26, and the pair of side folding pieces 31 are bent downward with respect to the pair of side flaps 27, respectively. Thereby, the packaging box 1 in the open state shown in FIG. 2 can be assembled. However, the accommodation of the article into the box body 10 may be performed after bending the reinforcing wall 25 with respect to the outer peripheral wall 11.

[0051] Subsequently, the lid body 40 in the open state shown in FIG. 2 is rotated and closed on the box body 10. Thereby, the frame wall portion 42 of the lid body 40 is fitted to the outside of the outer peripheral wall 11 of the box body 10 other than the rear plate 16, and the upper end opening 12 of the box body 10 can be closed by the lid main body portion 41 of the lid body 40. Further, by closing the lid body 40 to the box body 10, as shown in FIG. 3, the lock piece 51 of the box body 10 that can be elastically displaced outward is locked to the lock receiving portion 54 of the lid body 40. As a result, the packaging box 1 can be set in a locked state in which the lid body 40 cannot be opened unless the lock by the lock portion 50 is released.

[0052] When changing the lid body 40 in the closed state shown in FIGS. 1, 3, and 4 to the open state shown in FIG. 2, as shown in FIG. 6, the operation portion 55 is pushed inward from the outside. Thereby, the lock piece 51 located inside the operation portion 55 is pushed inward, and the locking to the lock receiving portion 54 is released. Subsequently, while maintaining this pushed-in state, the lid body 40 is rotated backward about the bending portion 45. As a result, as shown in FIG. 2, the lid body 40 is opened, and the upper end opening 12 of the box body 10 can be exposed.

[0053] When taking out the articles inside the box body 10 and closing the packaging box 1 again, the lid body 40 is rotated forward about the bending portion 45. As a result, as described above, the frame wall portion 42 of the lid body 40 is fitted to the upper portion of the outer peripheral wall 11 of the box body 10, and the upper end opening 12 of the box body 10 can be closed by the lid main body portion 41 of the lid body 40. Further, the locking piece 51 of the box body 10 is locked to the lock receiving portion 54 of the lid body 40, and the lid body 40 cannot be opened unless the lock by the locking portion 50 is released, so that a locked state can be achieved.

[0054] On the other hand, when a rearward external force is applied to the front plate 14 with respect to the box body 10 in the closed state shown in FIGS. 1, 3, and 4, the front flap 26 is pressed rearward together. Therefore, the front folding piece 30 abuts against the side folding piece 31, and the tension of the side flap 27 can suppress the bending of the front plate 14. Further, when a forward external force is applied to the rear plate 16 of the box body 10, the rear plate 16 abuts against the side flap 27, and the side flap 27 is pressed forward together. Therefore, the side folding piece 31 abuts against the front folding piece 30, and the tension of the side flap 27 can suppress the bending of the rear plate 16. Further, when an inward external force is applied to the side plate 15 of the box body 10, the side flap 27 is pressed inward together. Therefore, the side folding piece 31 abuts against the front folding piece 30, and the tension of the front flap 26 can suppress the bending of the side plate 15.

[0055] As described above, when an inward external force is applied to the outer peripheral wall 11 of the box body 10, the reinforcing wall 25 can suppress the inward bending of the outer peripheral wall 11. Therefore, an unintentional unlocking of the locking portion 50 can be suppressed. As a result, an unintentional opening of the lid body 40 can be suppressed.

[0056] The packaging box 1 configured as described above has the following features.

[0057] The box body 10 includes a front flap 26 connected to the front plate 14 and a side flap 27 connected to the side plate 15, and folding pieces 30 and 31 that abut against each other are connected to these. Thus, when an external force is applied to the outer peripheral wall 11 of the box body 10, the front folding piece 30 and the side folding piece 31 abut against each other, and the deflection of the outer peripheral wall 11 can be suppressed by the tension of the front flap 26 or the side flap 27. Therefore, it is possible to suppress the unlocking of the locking portion 50 between the box body 10 and the lid body 40 due to deflection, and it is possible to suppress the unintentional opening of the lid body 40.

[0058] The flaps 26 and 27 for suppressing deflection are respectively connected to the front plate 14 and the side plate 15, and the folding pieces 30 and 31 are respectively connected to the flaps 26 and 27. Therefore, an increase in the number of component parts constituting the packaging box 1 can be prevented, and the structure can be simplified. Moreover, while bending the front flap 26 with respect to the front plate 14 and simultaneously bending the side flap 27 with respect to the side plate 15, and at the same time, while bending the front folding piece 30 with respect to the front flap 26 and simultaneously bending the side folding piece 31 with respect to the side flap 27, the reinforcing wall 25 can be assembled. Therefore, the assembly workability can be improved as compared with the case of using a space holder made of a separate member for the lid body 40.

[0059] One side of the front folding piece 30 and one side of the side folding piece 31 are connected via a bent portion 34. Thus, when the front flap 26 and the side flap 27 are respectively bent with respect to the front plate 14 and the side plate 15, the box body 10 can be easily assembled by bending the folding pieces 30 and 31 with respect to the flaps 26 and 27 respectively.

[0060] The front folding piece 30 and the side folding piece 31 are in surface contact. Thus, when an external force is applied to the front plate 14 or the rear plate 16 of the box body 10, the deflection of the front plate 14 or the rear plate 16 can be reliably suppressed by the tension of the side flap 27. Also, when an external force is applied to the side plate 15 of the box body 10, the deflection of the side plate 15 can be reliably suppressed by the tension of the front flap 26.

[0061] The lid main body 41 of the lid 40 is connected to the upper end edge of the rear plate 16 facing the front plate 14 of the box main body 10 via a bent portion 45. Thereby, the box main body 10 and the lid 40 can be formed from a single blank. Therefore, the number of components constituting the packaging box 1 can be reduced.

[0062] The locking portion 50 has a locking piece 51 that can be elastically displaced outward and a locking receiving portion 54 with which the locking piece 51 can engage. Therefore, the upper end opening 12 of the box main body 10 can be reliably maintained in a state closed by the lid 40. Further, an operation portion 55 capable of releasing the engagement of the locking piece 51 with the locking receiving portion 54 is provided on the front plate portion 43 where the locking receiving portion 54 is provided. Therefore, by pushing in the operation portion 55, the locking by the locking portion 50 can be released and the upper end opening 12 of the box main body 10 can be reliably opened.

[0063] Hereinafter, other embodiments and various modifications of the present invention will be described. In these descriptions, points not particularly mentioned are the same as those in the first embodiment. In the drawings referred to below, the same reference numerals are given to the same elements as those in the first embodiment.

[0064] (Second Embodiment) Referring to FIGS. 7 to 10, the packaging box 1 of the second embodiment is different from the packaging box 1 of the first embodiment shown in FIG. 2 in the configuration of the bottom wall 20 of the box main body 10 and the configuration of the front plate portion 43 of the lid 40. Further, referring to FIG. 10, the blank of the packaging box 1 of the second embodiment is different from the blank of the packaging box 1 of the first embodiment shown in FIG. 5 in that the additional portion 18, the front plate 14, the right side plate 15, the rear plate 16, and the side plate main body 17 constituting the left side plate 15 are connected in sequence from left to right. A bending line 19a formed of a general-purpose ruled line is formed between the additional portion 18 and the front plate 14.

[0065] Referring to FIGS. 7 and 9, the bottom wall 20 is of a one-touch type that can close the lower end opening 13 by opening the outer peripheral wall 11 in a square tube shape. This bottom wall 20 is square-shaped and extends along the XY plane, and is composed of a pair of short flaps 21 and long flaps 22 respectively. The pair of short flaps 21 are generally trapezoidal in shape and are respectively connected to the pair of side plates 15 via the bent portions 23. The pair of long flaps 22 are elongated and generally trapezoidal in shape and are respectively connected to the front plate 14 and the rear plate 16 via the bent portions 24.

[0066] Referring to FIG. 10, the pair of short flaps 21 are respectively connected and provided to the lower edges of the right side plate 15 and the side plate body 17 via the bending lines 23a that constitute the bent portion 23. The pair of long flaps 22 are respectively connected and provided to the lower edges of the front plate 14 and the rear plate 16 via the bending lines 24a that constitute the bent portion 24. Both the bending lines 23a and 24a are constituted by general-purpose ruled lines. A sticking portion 22a is connected and provided to the pair of long flaps 22 via a bending line 22b. The bending line 22b is constituted by a reverse ruled line formed by ruling from the side of the surface liner so as to compress the wall thickness, as shown by the two-dot chain line in FIG. 10.

[0067] Referring to FIGS. 8 and 9, similar to the first embodiment, the lid body 40 includes a lid main body portion 41 and a frame wall portion 42, and the frame wall portion 42 includes a front plate portion 43 and a pair of side plate portions 44. Among them, the lid main body portion 41 and the pair of side plate portions 44 of the frame wall portion 42 have the same configuration as that of the first embodiment.

[0068] The lid body 40 of the second embodiment includes a pair of folding pieces 60, a single folding-back piece 62, and a positioning piece 64, and is maintained in an assembled state without being adhered by an adhesive by these. Further, a lock receiving portion 54 that constitutes the lock portion 50 is provided on the folding-back piece 62.

[0069] The pair of folding pieces 60 are provided in place of the pair of sticking pieces 48 shown in FIG. 2. The pair of folding pieces 60 are elongated in the width direction and are connected to the front end of the side plate portion 44 via a bent portion 61. The pair of folding pieces 60 are respectively bent inward with respect to the pair of side plate portions 44 and are arranged in a state of being sandwiched between the front plate portion 43 and the folded-back piece 62. Referring to FIG. 10, the pair of folding pieces 60 are respectively connected to the upper ends of the pair of side plate portions 44 via a bending line 61a that constitutes the bent portion 61. The bending line 61a is constituted by a general-purpose ruled line.

[0070] Referring to FIGS. 8 and 9, the folded-back piece 62 is connected to the lower edge of the front plate portion 43 via two bent portions 63 and is folded back to the inner surface side of the front plate portion 43. The lateral width of the folded-back piece 62 in the left-right direction is slightly smaller than the lateral width of the front plate portion 43. The folded-back piece 62 has a height dimension such that the upper end generally abuts against the inner surface of the lid main body portion 41. Referring to FIG. 10, the folded-back piece 62 is connected to the upper end of the front plate portion 43 via two bending lines 63a that constitute the two bent portions 63. The pair of bending lines 45a are both constituted by general-purpose ruled lines and extend in parallel with a space equivalent to the thickness of one sheet of the cardboard sheet.

[0071] Referring to FIGS. 8 and 9, the positioning piece 64 is connected to the upper end of the folded-back piece 62 via a bent portion 65 and extends toward the rear plate 16 along the lid main body portion 41. The positioning piece 64 is pressed against the lid main body portion 41 by the stiffness of the cardboard sheet, and the folded-back piece 62 is maintained in a folded-back state along the front plate portion 43 by the frictional resistance therebetween. The lateral width of the positioning piece 64 in the left-right direction is smaller than the lateral width of the lid main body portion 41 and is substantially the same as the lateral width of the folded-back piece 62. Referring to FIG. 10, the positioning piece 64 is connected to the upper end of the folded-back piece 62 via a bending line 65a that constitutes the bent portion 65. The bending line 65a is constituted by a half-cut lead ruled line similar to the bending line 19b shown in FIG. 5.

[0072] When assembling the blank shown in Fig. 10 as shown in Figs. 7 to 9, the short flap 21 is mountain-folded and overlapped with respect to the right side plate 15 and the side plate body 17, and the long flap 22 is mountain-folded and overlapped with respect to the front plate 14 and the rear plate 16, respectively. Subsequently, the sticking portions 22a are valley-folded and overlapped with respect to the long flaps 22, the front plate 14 is mountain-folded with respect to the right side plate 15, and the side plate body 17 is mountain-folded with respect to the rear plate 16. Then, the overlapping side plate body 17 and the supplementary part 18, and the sticking portion 22a and the short flap 21 are stuck with an adhesive (for example, hot melt), respectively.

[0073] Thereby, a continuous cylindrical outer peripheral wall 11 composed of the front plate 14, a pair of side plates 15, and the rear plate 16 is formed. Further, by expanding the outer peripheral wall 11 into a square tube shape, the short flap 21 rotates with respect to the pair of side plates 15, and the long flap 22 rotates with respect to the front plate 14 and the rear plate 16, and a bottom wall 20 that can close the bottom of the outer peripheral wall 11 with one touch is formed. In this state, the reinforcing wall 25 is assembled in the same manner as in the first embodiment.

[0074] In the state where the box body 10 is assembled in this way, the lid body 40 remains in the blank state shown in Fig. 10. When assembling the lid body 40, after bending the pair of side plate portions 44 with respect to the lid body portion 41, the pair of folding pieces 60 are bent with respect to the pair of side plate portions 44, respectively. Subsequently, the front plate portion 43 is bent with respect to the lid body portion 41, and the folded-back piece 62 is bent with respect to the lid body portion 41, and the pair of folding pieces 60 are sandwiched therebetween. Further, by bending the folded-back piece 62 with respect to the front plate 43, the positioning piece 64 abuts against the inner surface of the lid body portion 41 and bends with respect to the folded-back piece 62. Among the lid body 40, the front plate portion 43, the pair of folding pieces 60, and the folded-back piece 62 are overlapped from the front side to the rear side in this order, so the pair of folding pieces 60 and the folded-back piece 62 can be regarded as constituting a part of the front plate portion 43.

[0075] By assembling the box body 10 and the lid body 40 as described above, the assembly of the packaging box 1 other than the lock receiving portion 54 shown in Fig. 8 is completed. However, for the packaging box 1, the lid body 40 may be assembled prior to the box body 10, and the assembly method can be changed as required.

[0076] Referring to FIGS. 8 and 9, the locking portion 50 includes a locking piece 51 and a locking receiving portion 54, similar to the first embodiment. The locking piece 51 has the same configuration as that in the first embodiment and is provided on the front plate 14 of the box body 10. The locking receiving portion 54 is provided on a folded-back piece 62 that forms a part of the front plate portion 43 of the lid body 40.

[0077] The locking receiving portion 54 is formed by a part of a folded-back portion 66 that is folded back with respect to the folded-back piece 62, and receives the locking of the locking piece 51. More specifically, the folded-back portion 66 has a trapezoidal shape protruding upward and includes a pair of convex portions 66a, and the upper end edges of these constitute the locking receiving portion 54.

[0078] The folded-back portion 66 has a trapezoidal shape, is continuous with the folded-back piece 62 via a bent portion 67, and is divided by a cutting portion 68. The folded-back portion 66 is folded back so as to extend downward with respect to the folded-back piece 62 and is sandwiched between the folded-back piece 62 and the front plate portion 43. The maximum width of the folded-back portion 66 in the left-right direction is narrower than the interval between the pair of folded-in pieces 60. The convex portions 66a extend flush with the folded-back portion 66 and protrude upward from the bent portion 67.

[0079] Referring to FIG. 10, the folded-back portion 66 is partitioned within the folded-back piece 62 by a folding line 67a that forms the bent portion 67 and a cutting line 68a that forms the cutting portion 68. The folding line 67a is not provided within the pair of convex portions 66a. A trapezoidal punching portion 69 is provided between the end portion of the folded-back portion 66 on the side opposite to the folding line 67a and the positioning piece 64.

[0080] When assembling the lid body 40, when the folded-back piece 62 is bent with respect to the front plate portion 43, the folded-back portion 66 is bent with respect to the folded-back piece 62. As a result, as shown in FIGS. 8 and 9, the folded-back portion 66 is sandwiched between the folded-back piece 62 and the front plate portion 43, and the pair of convex portions 66a are exposed inward through the space formed by the folding back of the folded-back piece 62.

[0081] In the packaging box 1 configured as described above, when the lid 40 in the open state shown in FIG. 8 is rotated on the box body 10, similar to the first embodiment, the frame wall portion 42 of the lid 40 fits into the outer peripheral wall 11 of the box body 10, and the upper end opening 12 of the box body 10 can be closed by the lid main body portion 41 of the lid 40. Further, when the lid 40 is closed on the box body 10, as shown in FIG. 9, the lock piece 51 of the box body 10 that can be elastically displaced outward engages with the lock receiving portion 54 of the lid 40. As a result, the packaging box 1 can be placed in a locked state where the lid 40 cannot be opened unless the lock by the lock portion 50 is released.

[0082] When changing the lid 40 in the closed state shown in FIGS. 7 and 9 to the open state shown in FIG. 8, the operation portion 55 is pushed inward from the outside. Thereby, the lock piece 51 located inside the operation portion 55 is pushed inward, and the engagement with the lock receiving portion 54 is released. Subsequently, while maintaining this pushed-in state, the lid 40 is rotated backward about the bent portion 45. As a result, as shown in FIG. 2, the lid 40 can be opened and the upper end opening 12 of the box body 10 can be exposed.

[0083] On the other hand, when an inward external force is applied to the outer peripheral wall 11 of the box body 10 in the closed state shown in FIGS. 7 and 9, similar to the first embodiment, the outer peripheral wall 11 can be suppressed from bending inward by the reinforcing wall 25. Therefore, an unintentional unlocking of the lock portion 50 can be suppressed. As a result, an unintentional opening of the lid 40 can be suppressed.

[0084] (Third Embodiment) Referring to FIG. 11, the packaging box 1 of the third embodiment is different from the first embodiment in that the box body 10 and the lid 40 are configured as separate bodies.

[0085] The box body 10 is connected to the rear plate 16 via a bent portion 71 and includes a rear flap 70 that forms part of the reinforcing wall 25. On both sides of the rear flap 70, rear folding pieces 72 are respectively connected via bent portions 73. The pair of rear folding pieces 72 are in surface contact with and abut against the side folding pieces 31 respectively connected to the pair of side flaps 27, and are connected via a bent portion (not shown). The rear plate 16 is provided with a locking piece 51 in the same manner as the front plate 14.

[0086] The lid body 40 is connected to the lid main body portion 41 via a bent portion 76 and includes a rear plate portion 75 that forms the frame wall portion 42. The rear plate portion 75 is connected to the pair of side plate portions 44 via a pair of sticking pieces 77 respectively. Each sticking piece 77 is connected to the side plate portion 44 via a bent portion 78 and is stuck to the rear plate portion 75 with an adhesive (for example, hot melt).

[0087] The sticking piece 77 is provided with a lock receiving portion 54 formed by a notch, similar to the sticking piece 48 stuck to the front plate portion 43. Further, the rear plate portion 75 is provided with an operation portion 79 similar to the operation portion 55 formed on the front plate portion 43.

[0088] In the third embodiment configured as described above, by covering the box body 10 with the lid body 40 from above, the upper end opening 12 of the box body 10 can be closed and locked in a state where it is difficult to open by the locking portion 50.

[0089] On the other hand, by pushing the operation portions 55 and 79 inward and pulling up the lid body 40 with respect to the box body 10, the upper end opening 12 of the box body 10 can be opened as shown in the figure. Further, when an inward external force is applied to the outer peripheral wall 11 with respect to the box body 10 in the closed state, the reinforcing wall 25 can suppress the inward deflection of the outer peripheral wall 11. Therefore, the unlocking of the locking portion 50 can be suppressed, and the unintentional opening of the lid body 40 can be suppressed.

[0090] Note that the present invention is not limited to the configuration of the above-described embodiment, and various modifications are possible.

[0091] For example, the reinforcing wall 25 may be composed of one front flap 26 and one rear flap 70 without providing one of the pair of side flaps 27. In this case, it is preferable to set the total length of the front flap 26 in the left - right direction to be half or more of the left - right dimension of the front plate 14.

[0092] A pair of adjacent folding pieces 30, 31 may be separated without being connected via the bent portion 34. A configuration may be adopted in which slits are respectively provided in the separated folding pieces 30, 31, and the pair of folding pieces 30, 31 are connected by meshing.

[0093] The front flap 26 and the side flap 27 may be partially provided with punched portions.

[0094] The locking portion 50 may be formed on the side plate 15 and the side plate portion 44. In this case, among the two pairs of side plates 15 and side plate portions 44 corresponding to the left and right, the locking portion 50 may be provided on both pairs, or may be provided on one pair.

[0095] The locking portion 50 is not limited to the configuration including the locking piece 51 and the locking receiving portion 54, and can be changed as necessary as long as it can lock the lid body 40 to the box body 10 so that it is difficult to open. Specifically, as shown in FIG. 12, the locking piece 51 may be arranged on the front side of the front plate 14 by raising a part of the front flap 26. Also, the locking piece 51 and the locking receiving portion 54 may be provided separately and adhered to the front plate 14 and the front plate portion 43. Further, the locking portion 50 may be composed of an adhesive material that can repeatedly perform peeling and sticking.

[0096] The bottom wall 20 of the packaging box 1 of the first embodiment and the third embodiment may be of the one - touch type like the bottom wall 20 of the second embodiment. Also, the bottom wall 20 of the second embodiment may be of the sticking type like the bottom wall 20 of the first embodiment.

[0097] The outer peripheral wall 11 of the packaging box 1 is not limited to a rectangular tube shape, and may be a hexagonal tube shape provided with inclined plates between the front plate 14 and the pair of side plates 15 or between the pair of side plates 15 and the rear plate 16, or may be an octagonal tube shape provided with inclined plates between all of them. If it is a multi-sided tube shape, it can be changed as needed. In this case, the frame wall portion 42 of the lid body 40 may be formed in the same multi-sided tube shape.

[0098] The material of the packaging box 1 is not limited to a paper corrugated sheet, and may be a resin corrugated sheet. Further, the material of the packaging box 1 is not limited to a corrugated sheet, and may be a single-layer cardboard or a resin sheet.

Explanation of reference numerals

[0099] 1 Packaging box 10 Box body 11 Outer peripheral wall 12 Upper end opening (opening of the second end) 13 Lower end opening (opening of the first end) 14 Front plate 15 Side plate 16 Rear plate 17 Side plate body 18 Substitute 19 Bending part 19a Bending line 19b Bending line 20 Bottom wall (closing wall) 21 Short flap 22 Long flap 22a Adhesive part 22b Bending line 23 Bending part 23a Bending line 24 Bending part 24a Bending line 25 Reinforcing wall 26 Front flap 27 Side flap 28 Bending part 28a Bending line 29 Bending part 29a Bending line 30 Front folding piece 31 Side folding piece 32 Bending part 32a Bending line 33 Bend 33a Bend line 34 Bend (first bend) 35 Cutting line 40 Cover 41 Cover body part 42 Frame wall part 43 Front plate part 44 Side plate part 45 Bend (second bend) 45a Bend line 46 Bend 46a Bend line 47 Bend 47a Bend line 48 Adhesive piece 49 Bend 49a Bend line 50 Lock part 51 Lock piece 52 Bend (third bend) 53 Slit 54 Lock receiving part 54a Inclined edge 54b Locking edge 55 Operating part 55a Cutting line 55b Bend line 60 Folding piece 61 Bend 61a Bend line 62 Folding-back piece 63 Bend 63a Bend line 64 Positioning piece 65 Bend 65a Bend line 66 Folding-back part 66a Protrusion 67 Bend 67a Bend line 68 Cutting part 68a Cutting line 69 Punching part 70 Rear flap 71 Bend 72 Rear folding piece 73 Bend 75 Rear plate part 76 Bend 77 Adhesive piece 78 Bending part 79 Operating part

Claims

1. A box body having a cylindrical outer peripheral wall including a front plate and side plates continuous with the front plate, and a closing wall continuous with the first axial end of the outer peripheral wall and closing the opening at the first end; A lid body portion disposed at the second axial end of the outer peripheral wall, a front plate portion continuous with the lid body portion and disposed overlapping the outside of the front plate, and side plate portions continuous with the lid body portion and the front plate portion respectively and disposed overlapping the outside of the side plates, the lid body for openably closing the opening at the second end of the outer peripheral wall; A locking portion formed on the front plate and the front plate portion, or on the side plate and the side plate portion, for openably locking the lid body to the box body; A front flap continuously provided at the edge of the front plate on the lid body side and extending along the lid body portion; A side flap continuously provided at the edge of the side plate on the lid body side and extending along the lid body portion; A front folding piece continuously provided at the edge of the front flap on the side flap side and folded toward the closing wall side; A side folding piece continuously provided at the edge of the side flap on the front flap side and folded toward the closing wall side to abut against the front folding piece A packaging box comprising:

2. Both the front folding piece and the side folding piece are triangular in shape, One side of the front folding piece and one side of the side folding piece are connected via a first bending portion. The packaging box according to claim 1.

3. The edge of the front flap on the side flap side and the edge of the side flap on the front flap side abut against each other, The front folding piece and the side folding piece are in surface contact. The packaging box according to claim 1 or 2.

4. The lid body portion of the lid body is connected to the edge of the rear plate facing the front plate on the lid body side of the box body via a second bending portion. The packaging box according to claim 1 or 2.

5. The outer peripheral wall of the box body is in the shape of a rectangular cylinder having the front plate, a pair of the side plates respectively connected to both sides of the front plate, and the rear plate respectively connected to the pair of side plates, The lid body has the lid main body portion, the front plate portion connected to the front edge of the lid main body portion, and a pair of the side plate portions respectively connected to both sides of the lid main body portion and the front plate portion, The locking portion is provided on the front plate and the front plate portion, and the packaging box according to claim 4.

6. The locking portion is, A locking piece that is connected to the front flap or the side flap via a third bent portion and is elastically displaceable outward with respect to the front plate or the side plate, and A locking receiving portion that is provided on the front plate portion or the side plate portion so as to correspond to the locking piece and into which the locking piece can be locked and has, On the front plate portion or the side plate portion provided with the locking receiving portion, an operating portion is provided that can push the locking piece inward to release the locking of the locking piece to the locking receiving portion, and the packaging box according to claim 1 or 2.

Images