Packaging box

Abstract

To provide a packaging box that can be properly assembled to a storage case in which an article to be stored is stored inside.SOLUTION: The packaging box can be assembled to a storage case in which an article to be stored is stored inside, includes: a box body that has a plurality of side walls, and is arranged in adjacent position to the storage case in a first direction that intersects with a vertical direction of the storage case; an extension part that extends from an end of one side wall in the first direction and that overlaps with one end part of the storage case in the vertical direction when the box body is adjacent to the storage case in the first direction; and a protrusion part that protrudes from the extension part and that fits between one end part of the storage case and the article to be stored in the storage case when the box body is adjacent to the storage case in the first direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging box, and more particularly to a packaging box that can be assembled to a storage case in which an object to be stored is stored inside.

Background Art

[0002] A packaging box that can be assembled to a storage case in which an object to be stored is stored inside is known (see, for example, Patent Document 1). The packaging box described in Patent Document 1 is a canned food holder for holding canned food as a prize, and is assembled to a multi-pack package in which a plurality of canned beers are collectively stored. The canned food holder is attached to the side surface of the multi-pack package using a separately prepared tape for assembly.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the assembly method described in Patent Document 1, it is necessary to separately prepare a tape for assembly. On the other hand, as a method that does not use a tape for assembly, a method of providing engaging portions corresponding to each other on both the storage case and the packaging box can be considered. For example, a method of providing an opening (engaging portion on the storage case side) on the side surface of the storage case and providing an insertion piece (engaging portion on the packaging box side) that can be inserted into the opening on the packaging box can be considered. However, in such a method, it is not possible to appropriately assemble the packaging box to a storage case in which corresponding engaging portions are not provided.

[0005] Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a packaging box that can be appropriately assembled to a storage case in which an object to be stored is stored inside.

Means for Solving the Problems

[0006] According to the packaging box of the present invention, the above object is achieved by a packaging box that can be assembled to a storage case in which an object to be stored is stored inside, having a plurality of side walls, and being disposed at a position adjacent to the storage case in a first direction intersecting the vertical direction of the storage case, a box body, an extension portion extending from an end in the first direction of one side wall, and when the box body is adjacent to the storage case in the first direction, the extension portion is overlapped with one end portion of the storage case in the vertical direction, and a protruding portion protruding from the extension portion and entering between one end portion of the storage case and the object to be stored in the storage case when the box body is adjacent to the storage case in the first direction.

Effects of the Invention

[0007] According to the present invention, it is possible to provide a packaging box that can be appropriately assembled to a storage case in which an object to be stored is stored inside.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0009] Hereinafter, one embodiment of the present invention (hereinafter, this embodiment) will be described with reference to the accompanying drawings. Note that the following embodiments are merely examples given for easy understanding of the present invention and do not limit the present invention. That is, the configuration of the present invention can be changed or improved from the following embodiments without departing from the gist thereof. In addition, the material, shape, etc. of each member used for carrying out the present invention can be arbitrarily set according to the use of the present invention and the technical level at the time of carrying out the present invention, etc., unless otherwise specified. The present invention also includes equivalents thereof.

[0010] In addition, in this specification, "orthogonal", "parallel", and "perpendicular" shall include the range of errors allowed in the technical field to which the present invention belongs. For example, "orthogonal", "parallel", and "perpendicular" in this specification mean that they are within a range of less than ±10° with respect to strict orthogonality or perpendicularity. Note that the error from strict orthogonality, parallelism, or perpendicularity is preferably 5° or less, and more preferably 3° or less. In addition, in this specification, the meanings of "same" and "identical" may include the range of errors generally allowed in the technical field to which the present invention belongs.

[0011] <<Regarding the outline of the packaging box according to this embodiment>> With reference to FIG. 1, the outline of the packaging box (hereinafter, packaging box 10) according to this embodiment will be described. The packaging box 10 is a box body that can be assembled to the storage case 100, and is displayed at a store sales floor or the like when assembled to the storage case 100. Inside the storage case 100, the object to be stored 200 (for example, a beverage can or the like) is stored, and inside the packaging box 10, items related to the object to be stored 200, for example, prizes given to the purchaser of the object to be stored 200, are stored. The packaging box 10 and the storage case 100 are delivered to the store in separate outer packaging boxes, and the packaging box 10 is delivered from the manufacturer to the store in a state where a plurality of them are packed in one outer packaging box. Thereafter, at the store, the delivered packaging box 10 will be assembled to the storage case 100.

[0012] <<Regarding the configuration of the storage case according to this embodiment>> Next, with reference to FIG. 1, an example will be given to explain the configuration of the storage case 100. In the following description, the object to be stored 200 will be described on the premise of a columnar (cylindrical) object to be stored (for example, a beverage can or the like). As shown in FIG. 1, the columnar object to be stored 200 has a flange portion 201 (corresponding to a concave portion) at one end in its axial direction. The flange portion 201 has a concave shape, and specifically, has a circular surface portion and an annular edge portion that protrudes along the edge of the surface portion. Although not particularly shown, a pull tab may be provided on the surface portion of the flange portion 201. The pull tab is a part for forming an opening that communicates the internal space and the external space of the object to be stored 200 on the surface portion, and when the object to be stored 200 is a beverage can, the opening corresponds to a drinking port.

[0013] As long as the object to be stored 200 has a configuration having the flange portion 201, its shape is not particularly limited, and for example, it may be a columnar member or a cylindrical member having a cross-sectional shape such as a polygon (e.g., triangle and quadrilateral), an ellipse, and an irregular shape. In this embodiment, as shown in FIG. 1, it is assumed that a plurality of objects to be stored 200, specifically, six objects to be stored 200 arranged in two rows with three as one unit, are stored inside the storage case 100.

[0014] In the following description, as shown in FIG. 1, three directions that intersect (are orthogonal) to each other are defined as the "vertical direction", the "front-rear direction (corresponding to the first direction)", and the "left-right direction (corresponding to the second direction)", respectively. The "vertical direction" is parallel to the axial direction of the cylindrical object 200 when the bottom side of the cylindrical object 200 is placed. The "upper side" is the side of the flange portion 201 of the object 200, and the "lower side" is the side opposite to the flange portion 201 of the object 200 (i.e., the bottom side).

[0015] Also, the "front-rear direction" is the direction in which the packaging box 10 and the storage case 100 are arranged when the packaging box 10 is assembled to the storage case 100 (the state in FIG. 1). The side of the packaging box 10 is the "front side", and the side of the storage case 100 is the "rear side". Also, the "left side" and the "right side" in the "left-right direction" are defined based on the case when viewed from the front side (the box body 20 side in the front-rear direction). Also, in the following description, unless otherwise specified, in each part (specifically, the box body 20, the extension part 30, the main surface wall 62, the storage case 100, the upper plate part 101, etc.), the side approaching its center is the "inner side", and the side moving away from its center is the "outer side".

[0016] Also, in the following description, on the premise that the packaging box 10 is assembled to the storage case 100 placed horizontally with respect to the placement surface on which the bottom side of the storage case 100 is placed, the flange portion 201 of the object 200 is in a state directed upward. That is, unless otherwise specified, the normal use state of the packaging box 10 assumes a state assembled to the storage case 100 placed horizontally with respect to the above-mentioned placement surface. When explaining the position of the packaging box 10, as well as the orientation and extension direction of each part of the packaging box 10, etc., the position, orientation, and extension direction when the packaging box 10 is in the normal use state shall be indicated.

[0017] As shown in FIG. 1, the housing case 100 has openings at both ends in the left - right direction and forms a long cylindrical (sleeve - like) shape in the left - right direction. In this embodiment, the housing case 100 has a rectangular cross - sectional shape perpendicular to its longitudinal direction (left - right direction), and specifically, it is composed of four plate portions. The four plate portions are composed of two plate portions arranged apart from each other in the up - down direction and two plate portions arranged apart from each other in the front - rear direction. Adjacent plate portions are connected to each other. Examples of the material of the housing case 100 include cardboard, paperboard, and resins other than paper. In the following description, among the four plate portions of the housing case 100, the upper plate portion is referred to as the "upper plate portion 101 (corresponding to one end)" (see FIG. 1).

[0018] As shown in FIG. 1, the upper plate portion 101 has two recessed regions 101a. The recessed regions 101a are respectively provided at both ends of the upper plate portion 101 in the left - right direction and are recessed toward the central side of the upper plate portion 101 in the left - right direction. In the front - rear direction, the recessed regions 101a are provided in the central region of the upper plate portion 101. The recessed regions 101a have, for example, a function as a positioning portion when positioning the housing case 100 with respect to a can - making machine (assembly device) in the manufacturing process of the housing case 100. Also, the recessed regions 101a have, for example, a function as part of the design of the housing case 100.

[0019] Also, as shown in FIG. 1, the upper plate portion 101 has two holes 101b. The two holes 101b are arranged side by side in the left - right direction in the central region of the upper plate portion 101 in the left - right direction. In the front - rear direction, the two holes 101b are provided in the central region of the upper plate portion 101. The two holes 101b have a function as a part where fingers are hooked when lifting the housing case 100.

[0020] In the above description, the housing case 100 is assumed to form a cylindrical shape with a longer dimension in the left - right direction than in the front - rear direction. However, it is not limited to this. For example, it may form a cylindrical shape with a longer dimension in the front - rear direction than in the left - right direction.

[0021] <<Configuration of the packaging box according to this embodiment>> Next, with reference to FIGS. 1 to 5, the configuration of the packaging box 10 will be described. As shown in FIGS. 1 and 2, the packaging box 10 has a box body 20, an extension part 30 extending from an end of the box body 20, and two protruding parts 40 protruding from the extension part 30. By the protruding part 40 entering between the upper plate part 101 of the storage case 100 and the flange part 201 of the object to be stored 200, the packaging box 10 can be assembled to the storage case 100. In FIG. 2, the protruding part 40 on the right side in the figure is shown in a state of being removed from the storage case 100 for convenience of explanation. However, in the normal use state of the packaging box 10, it is assumed that, like the protruding part 40 located on the left side in the figure, it enters between the storage case 100 and the object to be stored 200. The packaging box 10 may be formed, for example, by bending a single sheet-like blank 12 (see FIG. 6) described later, or may be formed by connecting a plurality of plate materials (blank pieces). The material of the packaging box 10 can be selected from various paper materials such as cardboard and thick paper, for example. The paper quality can be any kind, and it may be one with various coatings or one formed of a resin other than paper.

[0022] <Box body> The box body 20 forms a hollow box, and accommodates articles (such as prizes given to the purchasers of the articles to be accommodated 200) inside. In this embodiment, the box body 20 forms a flat rectangular parallelepiped (hexahedron) that is short in the front-rear direction, and is composed of a plurality (six) of walls. The six walls each form a rectangular shape in plan view. Specifically, it is composed of a plurality (two) of the largest walls (hereinafter also referred to as "main surface walls") and a plurality (four) of side walls. The two main surface walls are arranged apart from each other in the front-rear direction, and the four side walls rise from the four sides of the main surface walls respectively. Among the four side walls, two side walls are arranged apart from each other in the vertical direction, and the remaining two side walls are arranged apart from each other in the left-right direction. In the following description, among the four side walls of the box body 20, the upper side wall is referred to as the "upper wall 21 (corresponding to one side wall)" (see FIG. 1). The box body 20 is arranged at a position adjacent to the storage case 100 in the front-rear direction. In this embodiment, the box body 20 is located on the front side of the storage case 100.

[0023] <Extended portion> As shown in FIG. 1, the extended portion 30 is plate-shaped and extends from the end of the upper wall 21 of the box body 20 in the front-rear direction, more specifically, from the end of the upper wall 21 on the storage case 100 side in the front-rear direction. In a state where the box body 20 is adjacent to the storage case 100 in the front-rear direction, the extended portion 30 is overlapped on the upper plate portion 101 of the storage case 100, and more specifically, is overlapped on the upper side of the upper plate portion 101. Note that the state where the box body 20 is adjacent to the storage case 100 in the front-rear direction may be rephrased as the state where the packaging box 10 is assembled to the storage case 100, and the same applies to the following description. In addition, "being overlapped" includes any case where one member (here, the extended portion 30) and the other member (here, the upper plate portion 101) are in contact with each other, not in contact with each other, or a case where contact areas and non-contact areas are mixed.

[0024] In this embodiment, the extending portion 30 is in contact with the upper plate portion 101 at least in a part of the region, and more specifically, it is in surface contact, or in point contact and line contact at a large number of locations. Therefore, the frictional force generated by the contact between the extending portion 30 and the upper plate portion 101 can reduce the displacement of the extending portion 30 with respect to the upper plate portion 101 when assembling the packaging box 10 into the housing case 100. As a result, when assembling the packaging box 10 into the housing case 100, the displacement of the protruding portion 40 continuous with the extending portion 30 can also be reduced. Consequently, when assembling the packaging box 10 into the housing case 100, the displacement of an engaging portion 42 (to be described later), which is a component of the protruding portion 40, with respect to the flange portion 201 of the object to be housed 200 can be reduced. Thereby, the engaging portion 42 can be engaged with the flange portion 201 at an appropriate position.

[0025] As described above, two hole portions 101b (see FIG. 1) for hanging fingers when lifting the housing case 100 are provided in the upper plate portion 101 of the housing case 100. On the other hand, in a state where the packaging box 10 is assembled into the housing case 100, if the hole portions 101b are covered by the extending portion 30, it becomes impossible to lift the housing case 100 using the hole portions 101b.

[0026] Regarding this, as shown in FIG. 1, a recessed portion 31 recessed toward the box body 20 side is provided at the tip of the extending portion 30 (the end on the housing case 100 side in the front-rear direction). The recessed portion 31 is arranged such that the two hole portions 101b are located within the inner region of the recessed portion 31, and specifically, it is arranged in the central region of the extending portion 30 in the left-right direction. Thereby, the extending portion 30 does not overlap with the two hole portions 101b, and as a result, even in a state where the packaging box 10 is assembled into the housing case 100, the housing case 100 can be lifted using the two hole portions 101b.

[0027] <Bending line at the boundary between the box body and the extending portion> As described above, a plurality of packaging boxes 10 are packed in an outer packaging box and delivered from a manufacturer to a store. However, it is desirable that the number of packaging boxes 10 accommodated in the outer packaging box be larger. That is, at the time of delivery, it is desirable that the packaging box 10 be more compact.

[0028] Regarding this, as shown in FIG. 1, between the box body 20 and the extending portion 30, there is a boundary portion 51 that linearly extends in the left-right direction. In the boundary portion 51, a folding line 51a (corresponding to a second folding line) is formed along the extending direction (left-right direction) of the boundary portion 51. The folding line 51a enables the extending portion 30 to be folded with respect to the box body 20. For example, it is a ruled line formed continuously or a sewing line formed intermittently. In addition, it is assumed that folding lines such as ruled lines or sewing lines are also formed in other boundary portions (for example, the boundary portions 52 and 53 in FIG. 3 described later) other than the boundary portion 51. By forming the folding line, one of the two portions adjacent to each other across the boundary portion can be appropriately folded with respect to the other with the boundary portion as a base point.

[0029] In this way, since the folding line 51a is formed in the boundary portion 51, when packing the packaging box 10 into the outer packaging box for delivery, the extending portion 30 can be folded toward the box body 20 side along the folding line 51a, and the extending portion 30 can be overlapped on the box body 20. More specifically, with the folding line 51a as a rotation axis, the extending portion 30 can be rotated and overlapped on the main surface wall of the box body 20. As a result, compared with the outer dimension of the packaging box 10 when assembling the packaging box 10 into the storage case 100, the outer dimension of the packaging box 10 at the time of delivery can be made more compact. Note that the "outer dimension" means the outer dimension of the packaging box 10 when viewed from the front-rear direction, and the same applies in the following description.

[0030] Here, the width (maximum width) of the extending portion 30 in the left-right direction is preferably equal to or less than the width (maximum width) of the box body 20 in the left-right direction. In the example shown in FIG. 2, it is the same as the width (maximum width) of the box body 20 in the left-right direction. Further, the length (longest) of the extending portion 30 in the up-down direction is preferably equal to or less than the length (longest) of the box body 20. Thus, when the extending portion 30 is stacked on the box body 20 for delivery, the extending portion 30 can be housed within the inner region surrounded by the outer shape of the box body 20 (more specifically, the main surface wall of the box body 20). For this reason, the outer size of the packaging box 10 during delivery becomes approximately the same as the outer size of the box body 20, and the outer size of the packaging box 10 during delivery can be made more compact.

[0031] Also, when assembling the packaging box 10 into the housing case 100, it is easy to perform the operation by lifting the box body 20 by hand. On the other hand, the box body 20 and the protruding portion 40 are continuous via the extending portion 30. Therefore, when the box body 20 is lifted, the posture of the protruding portion 40 can change. When the posture of the protruding portion 40 changes, it becomes difficult to insert the protruding portion 40 between the upper plate portion 101 and the flange portion 201. Regarding this, in the present embodiment, a bending line 51a is formed at the boundary portion 51. Thereby, with the boundary portion 51 as a base point (rotation axis), the box body 20 can be easily rotated upward without changing the posture of the protruding portion 40 (see FIG. 5). For this reason, it becomes easy to lift the box body 20 while maintaining the posture of the protruding portion 40, and as a result, the packaging box 10 can be smoothly assembled into the housing case 100.

[0032] <Protruding portion> As shown in FIG. 2, the protruding portion 40 protrudes from the extending portion 30. More specifically, it protrudes from both ends of the extending portion 30 in the left-right direction. The shapes of the two protruding portions 40 are symmetric about the left-right direction (line-symmetric with respect to the midline in the left-right direction), and each protruding portion 40 fits between the upper plate portion 101 of the housing case 100 and the object to be housed 200 (flange portion 201) within the housing case 100.

[0033] More specifically, as shown in FIG. 3, the protruding portion 40 has a folded-back portion 41 extending from the end of the extending portion 30 and an engaging portion 42 extending from the tip of the folded-back portion 41. As shown in FIG. 4, the folded-back portion 41 is folded back with the boundary portion 52 between the extending portion 30 and the folded-back portion 41 (protruding portion 40) as a base point, and the engaging portion 42 is folded back with the boundary portion 53 between the folded-back portion 41 and the engaging portion 42 as a base point. That is, in the protruding portion 40, two folds are made. And, as shown in FIG. 4, the edge portion 42a (to be described later), which is a component of the engaging portion 42, abuts against the inner surface of the edge of the flange portion 201, so that the engaging portion 42 engages with the flange portion 201.

[0034] Here, as shown in FIG. 1, the box body 20 is adjacent to the storage case 100 in the front-rear direction. In other words, it does not block the left-right opening of the storage case 100. For this reason, when the operator performs the operation of inserting the protruding portion 40 between the upper plate portion 101 and the flange portion 201, more specifically, the operation of engaging the engaging portion 42 with the flange portion 201, the operator can perform the operation while visually recognizing through the left-right opening of the storage case 100. Thereby, the operation of assembling the packaging box 10 to the storage case 100 can be smoothly advanced, and the engaging portion 42 can be appropriately engaged with the flange portion 201.

[0035] [Folded-back portion] As shown in FIG. 3, the folded-back portion 41 is plate-shaped and extends from the end of the extending portion 30, more specifically, from the left-right ends of the extending portion 30. In the present embodiment, the folded-back portion 41 has a shape in which the width gradually widens from its base end (the end on the extending portion 30 side) toward its tip end (the end on the engaging portion 42 side).

[0036] Specifically described with reference to FIG. 4, the folding portion 41 is folded downward along the bending line 52a formed in the linear boundary portion 52 extending in the front-rear direction (that is, with the boundary portion 52 as the base point) from the state before folding (the state where the extending portion 30 and the folding portion 41 are aligned on the same line). That is, when viewed from the front side (the front side of FIG. 4), the folding portion 41 is folded downward to the side of the contained object 200, below the extending portion 30, by rotating counterclockwise with the boundary portion 52 as the rotation axis. In the state after folding, as shown in FIG. 4, the angle formed by the extending portion 30 and the folding portion 41 with the boundary portion 52 as the corner is an acute angle. In other words, the folding portion 41 is pressed downward by the repulsive force of the boundary portion 52, and extends downward while inclining with respect to the horizontal direction toward the side approaching the box body 20 in the left-right direction, with the boundary portion 52 as the base end.

[0037] Here, at least the tip portion 41a of the folding portion 41 enters between the upper plate portion 101 and the flange portion 201 and is in contact with the lower surface of the upper plate portion 101. The tip portion 41a corresponds to the boundary portion 53 and the portion adjacent to the boundary portion 53 in the folding portion 41. In this way, when the folding portion 41 comes into contact with the upper plate portion 101, the positional deviation of the folding portion 41 with respect to the upper plate portion 101 when assembling the packaging box 10 into the storage case 100 can be reduced by the frictional force. As a result, when assembling the packaging box 10 into the storage case 100, the positional deviation of the engaging portion 42 continuous with the folding portion 41 with respect to the flange portion 201 is reduced, so that the engaging portion 42 can be engaged with the flange portion 201 at an appropriate position.

[0038] Further, the folding portion 41 sandwiches the upper plate portion 101 (the left and right ends thereof) together with the extending portion 30 from above and below in the vertical direction. Thus, when the box body 20 moves (rotates) with respect to the housing case 100, at least one of the folding portion 41 and the extending portion 30 catches on the upper plate portion 101, and with the boundary portion 52 in the folding portion 41 as a base point, the boundary portion 53 (the tip portion 41a) can stably enter between the upper plate portion 101 and the flange portion 201. As a result, the engaging portion 42 can be engaged with the flange portion 201 at an appropriate position.

[0039] Also, the folding portion 41 connects the extending portion 30 and the engaging portion 42 and is made of a deformable material (such as a paper material). Therefore, by deforming the folding portion 41, the position of the engaging portion 42 with respect to the extending portion 30, more specifically, the position of the engaging portion 42 in the front-rear direction and the left-right direction with respect to the extending portion 30 can be relatively shifted without displacement. Thereby, without moving the extending portion 30, the position of the engaging portion 42 with respect to the flange portion 201 can be adjusted (fine-adjusted), and as a result, the engaging portion 42 can be appropriately engaged with the flange portion 201.

[0040] Also, if the protruding portion 40 does not have the folding portion 41 and the engaging portion extends directly from the end of the extending portion 30, there may be a case where the engaging portion folded back from the extending portion 30 rides over the edge of the flange portion 201, and the edge portion of the engaging portion does not achieve a better contact state with the inner surface of the edge of the flange portion 201. On the other hand, in the present embodiment, since the protruding portion 40 has the folding portion 41, the engaging portion 42 can be guided into the inner space surrounded by the edge of the flange portion 201. Thereby, it is suppressed that the engaging portion 42 rides over the edge of the flange portion 201, and as a result, the edge portion 42a of the engaging portion 42 can be sufficiently brought into contact with the inner surface of the edge of the flange portion 201.

[0041] [Folding line at the boundary between the extending portion and the folding portion] Between the extending portion 30 and the folding portion 41 (projecting portion 40), there is a linear boundary portion 52 extending in the front-rear direction, and a folding line 52a is formed on the boundary portion 52 along the extending direction (front-rear direction) of the boundary portion 52. The folding line 52a enables the projecting portion 40 to be folded with respect to the extending portion 30, and is a ruled line or a perforation or the like.

[0042] Here, when the folding portion 41 is folded along the boundary portion 52, a repulsive force that tries to return the folding portion 41 to its original state is generated in the boundary portion 52. Due to this repulsive force, the folding portion 41 can be pressed downward. On the other hand, this repulsive force varies depending on the material and thickness of the packaging box 10 and the like. If this repulsive force is too weak, the engaging portion 42 may not be properly pressed downward, and the engaging portion 42 may not be properly engaged with the flange portion 201. On the other hand, if this repulsive force is too strong, the folding portion 41 may not be properly folded with respect to the extending portion 30, and it may be difficult to insert the projecting portion 40 between the upper plate portion 101 and the flange portion 201. Also, even if the projecting portion 40 can be inserted between the upper plate portion 101 and the flange portion 201, the projecting portion 40 may easily come off.

[0043] In contrast, in the present embodiment, the folding line 52a is formed on the boundary portion 52. Thereby, the bending rigidity of the boundary portion 52 can be reduced, and the repulsive force of the boundary portion 52 can be adjusted to an appropriate force. For this reason, while appropriately pressing the engaging portion 42 downward, it is possible to suppress the projecting portion 40 from coming off between the upper plate portion 101 and the object 200 to be accommodated. Furthermore, by adjusting the repulsive force of the boundary portion 52 to an appropriate force, the folding portion 41 can be pressed against the upper plate portion 101 with an appropriate force from below. Thereby, the folding portion 41 can appropriately contact the upper plate portion 101, and when assembling the packaging box 10 to the storage case 100, the displacement of the folding portion 41 with respect to the upper plate portion 101 can be further reduced.

[0044] Also, as described above, it is desirable that the packaging box 10 has a more compact size during delivery. Regarding this, since the folding line 52a is formed at the boundary portion 52, when packing the packaging box 10 into the outer packaging box for delivery, it is easy to fold the protruding portion 40 over the extending portion 30 along the folding line 52a. More specifically, with the folding-back portion 41 and the engaging portion 42 arranged on the same line (the non-folded state), using the boundary portion 52 as a rotation axis, it is easy to rotate the protruding portion 40 and fold it over the extending portion 30. Thereby, it is easy to make the packaging box 10 compact in size during delivery.

[0045] Here, as shown in FIG. 2, the width of the extending portion 30 in the left-right direction is wider than the width of the upper plate portion 101 in the left-right direction (specifically, the width between the two recessed regions 101a). For this reason, the boundary portion 52 located at the left and right ends of the extending portion 30 is located outside the upper plate portion 101 of the housing case 100 in the left-right direction, as shown in FIG. 4. Thereby, a gap S is formed between the boundary portion 52 and the upper plate portion 101. Since the gap S is formed between the boundary portion 52 and the upper plate portion 101, when folding back the folding-back portion 41, interference between the left and right ends of the upper plate portion 101 and the boundary portion 52 does not occur, so the folding-back portion 41 can be folded back easily and appropriately.

[0046] When assembling the packaging box 10 into the housing case 100, as a procedure for folding back the folding-back portion 41, after moving the extending portion 30 to one side in the left-right direction with respect to the upper plate portion 101 and folding back the folding-back portion 41 on one side, the extending portion 30 may be moved to the other side in the left-right direction with respect to the upper plate portion 101 and the folding-back portion 41 on the other side may be folded back. Thereby, when folding back the folding-back portion 41, the gap S can be widened to the maximum in the left-right direction, and as a result, the folding-back portion 41 can be folded back more easily.

[0047] [Engaging portion] The engaging portion 42 is plate-shaped and extends from the tip of the folding-back portion 41 as described above. At least a part of the outer edge of the engaging portion 42 constitutes an edge portion 42a, as shown in FIG. 3. The edge portion 42a has a shape corresponding to the annular edge of the flange portion 201, and in this embodiment, it has an arc shape.

[0048] The engaging portion 42 is folded downward along the bending line 53a formed on the linear boundary portion 53 extending in the front-rear direction (that is, with the boundary portion 53 as the reference point) as shown in FIG. 4 from the state before folding (the state where the folding portion 41 and the engaging portion 42 are aligned on the same line). That is, when viewed from the front side (the front side in FIG. 4), the engaging portion 42 is folded to the lower side (the side of the object 200 to be accommodated) than the folding portion 41 by rotating clockwise with the boundary portion 53 as the rotation axis.

[0049] In the state after folding, as shown in FIG. 4, the angle formed by the folding portion 41 and the engaging portion 42 with the boundary portion 53 as the corner is an acute angle. In other words, the engaging portion 42 is pressed downward by the repulsive force of the boundary portion 53, and extends downward while inclining with respect to the horizontal direction toward the side away from the box body 20 in the left-right direction with the boundary portion 53 as the base end. The edge portion 42a forming the tip of the engaging portion 42 faces the side away from the box body 20 in the left-right direction and contacts the inner surface of the edge of the flange portion 201 below the position horizontal with the boundary portion 53.

[0050] Note that in the state shown in FIG. 4, the boundary portion 53 is located away from the surface portion of the flange portion 201 upward, but in contrast, the boundary portion 53 may contact the surface portion of the flange portion 201. In that case, the engaging portion 42 extends horizontally toward the side away from the box body 20 in the left-right direction with the boundary portion 53 as the base end. In this case, the edge portion 42a forming the tip of the engaging portion 42 contacts the inner surface of the edge of the flange portion 201 perpendicularly.

[0051] As described above, the edge portion 42a has an arc shape corresponding to the edge of the flange portion 201. Specifically, the diameter of the virtual circle including the arc of the edge portion 42a corresponds to the diameter of the inner space surrounded by the edge of the flange portion 201 and is the same as or slightly smaller than the diameter of the inner space.

[0052] The circumferential range of the edge portion 42a in the engaging portion 42 is not particularly limited. For example, the edge portion 42a may be provided over the entire circumference (360°) of the engaging portion 42. In this case, the outer edge of the engaging portion 42 will be circular. As a result, the engaging portion 42 will come into contact with the entire inner surface of the edge of the flange portion 201 and can engage more appropriately.

[0053] On the other hand, when the outer edge of the engaging portion 42 is circular, the size of the engaging portion 42 becomes larger compared to the case where it is not circular. When the size of the engaging portion 42 becomes larger, correspondingly, the position of the boundary portion 53 between the folded-back portion 41 and the engaging portion 42 will be located closer to the box body 20 side in the left-right direction (see FIG. 4). For this reason, it is necessary to make the length of the folded-back portion 41 longer, and as a result, the size of the protruding portion 40 becomes larger. When the size of the protruding portion 40 becomes larger, it becomes difficult to insert the protruding portion 40 between the upper plate portion 101 and the flange portion 201, and the workability when assembling the packaging box 10 into the storage case 100 deteriorates.

[0054] Regarding this, through intensive studies by the inventor of the present invention, it has been found that the circumferential range of the edge portion 42a in the engaging portion 42 is preferably in the range of 1 / 12 (30°) to 1 / 3 (120°), more preferably in the range of 1 / 6 (60°) to 1 / 3 (120°) with respect to the entire circumference (360°). Thereby, while the engaging portion 42 engages appropriately with the flange portion 201, it is possible to suppress a decrease in workability when assembling the packaging box 10 into the storage case 100.

[0055] [Boundary portion between the folded-back portion and the engaging portion] As shown in FIG. 3, between the folded-back portion 41 and the engaging portion 42, there is a linear boundary portion 53 extending in the front-rear direction. As shown in FIG. 3, on the boundary portion 53, a bending line 53a (corresponding to the first bending line), a cut portion 53b (corresponding to the cut portion on the protruding portion side), and a tip cut portion 53c are formed.

[0056] (Bending line) As shown in Fig. 3, the bending line 53a extends from the end closer to the box body 20 in the front - rear direction of the boundary portion 53 to a position beyond the center in the front - rear direction of the boundary portion 53. The bending line 53a enables the engaging portion 42 to be bent with respect to the folding portion 41, and is a ruled line, a perforation, or the like. As a result, the boundary portion 53 can achieve the same effect as the boundary portion 52. That is, by forming the bending line 53a in the boundary portion 53, the bending rigidity of the boundary portion 53 can be reduced, and the repulsive force of the boundary portion 53 can be adjusted to an appropriate force. For this reason, while appropriately pressing the engaging portion 42 downward, it is possible to prevent the protruding portion 40 from coming off between the upper plate portion 101 and the object to be accommodated 200.

[0057] Here, when the thickness of the material constituting the packaging box 10 is thin, the desired repulsive force may not be obtained only by the repulsive force at one boundary portion. On the other hand, in the protruding portion 40, two folds are made with the two boundary portions 52 and 53 as the starting points. For this reason, the pressing force downward on the engaging portion 42 is strengthened by the sum of the repulsive forces at the two boundary portions 52 and 53. As a result, the protruding portion 40 can be more appropriately engaged with the flange portion 201.

[0058] (Cut - in portion) The cut - in portion 53b is formed at the end of the boundary portion 53 on the side far from the box body 20 in the front - rear direction, and extends from that end to the front of the center in the front - rear direction of the boundary portion 53. At the location where the cut - in portion 53b is formed, the folding portion 41 and the engaging portion 42 are separated. For this reason, the interlock between the engaging portion 42 and the folding portion 41 can be reduced. More specifically, in the state where the packaging box 10 is assembled to the storage case 100, when the box body 20 is moved, the extending portion 30 moves in conjunction with the box body 20, the folding portion 41 moves in conjunction with the extending portion 30, and the engaging portion 42 moves in conjunction with the folding portion 41. As a result, the engaging portion 42 may not be appropriately engaged with the flange portion 201. In contrast, in the present embodiment, even when the box body 20 is moved, since the cut portion 53b is formed in the boundary portion 53, the interlocking of the engaging portion 42 with respect to the folding portion 41 is restricted. As a result, the engaging portion 42 can be appropriately engaged with the flange portion 201.

[0059] Here, when the box body 20 rotates with respect to the storage case 100, the amount of rotation of the portion farther from the box body 20 becomes larger. Specifically, even at the same rotation angle, among the boundary portions 53, the end on the side farther from the box body 20 in the front-rear direction has a larger amount of rotation than the end on the side closer to the box body 20 in the front-rear direction. For this reason, the engagement between the engaging portion 42 and the flange portion 201 is more easily released at the end of the boundary portion 53 that is farther from the box body 20.

[0060] In contrast, in the present embodiment, the cut portion 53b is formed at the end of the boundary portion 53 on the side where the engagement between the engaging portion 42 and the flange portion 201 is easily released, that is, at the end on the side farther from the box body 20 in the front-rear direction. For this reason, the interlocking of the engaging portion 42 with respect to the box body 20 is restricted. As a result, the engagement between the engaging portion 42 and the flange portion 201 is less likely to be released, and the engaging portion 42 can be more appropriately engaged with the flange portion 201.

[0061] (Tip cut portion) The tip cut portion 53c is formed at the tip of the cut portion 53b, specifically, at the end on the box body 20 side in the front-rear direction of the cut portion 53b as shown in FIG. 3. The tip cut portion 53c extends in a direction (orthogonal) intersecting the direction (front-rear direction) in which the cut portion 53b extends. In this way, by forming the tip cut portion 53c at the tip of the cut portion 53b, even when a force to tear that portion is applied to the portion adjacent to the tip of the cut portion 53b in the protruding portion 40, the tearing force can be released in a direction intersecting the cut portion 53b at the tip of the cut portion 53b. Thereby, breakage of the portion adjacent to the tip of the cut portion 53b in the protruding portion 40 can be prevented.

[0062] As described above, in the packaging box 10, the protruding portion 40 enters between the upper plate portion 101 of the storage case 100 and the object 200 to be stored in the storage case 100, so that the packaging box 10 can be assembled to the storage case 100. Thereby, without separately preparing an assembly tape as described in the column of "Problems to be Solved by the Invention", or providing engaging portions (openings, insertion pieces, etc.) corresponding to each other on both the storage case and the packaging box, the packaging box 10 can be appropriately assembled to the storage case 100.

[0063] <<Procedures for Assembling the Packaging Box to the Storage Case>> Next, with reference to FIG. 5, the procedures for assembling the packaging box 10 to the storage case 100 will be described. First, take out the packaging box 10 from the outer packaging box delivered to the store, and reassemble the packaging box 10 from the delivery form to the assembly form. Specifically, unfold the extension portion 30 folded on top of the box body 20, and unfold the protruding portion 40 folded on top of the extension portion 30. Then, with the two boundary portions 52, 53 as the bases, fold the protruding portion 40 back twice.

[0064] Next, as shown in FIG. 5, insert the protruding portion 40 into the storage case 100 from the recessed region 101a of the storage case 100. More specifically, insert the two protruding portions 40 kept horizontal one by one between the upper plate portion 101 and the flange portion 201. At this time, to facilitate the operation, lift the box body 20 upward with the boundary portion 51 as the base and keep it horizontal.

[0065] At this point, the engaging portion 42 is placed on the flange portions 201 of each of the two articles 200 adjacent to each other in the front-rear direction, and is in a state of not entering the inner region of the flange portion 201. Therefore, it is necessary to shift the housing case 10 to one side in the front-rear direction to insert the engaging portion 42 into the inner region of the flange portion 201. As a procedure therefor, the packaging box 10 is slid to one side (the front side in FIG. 5) in the front-rear direction. Thereby, the engaging portion 42 falls into the inner region of the flange portion 201, and the engaging portion 42 engages with the flange portion 201. Thereafter, the box body 20 lifted horizontally is rotated downward with the boundary portion 51 as a base point, and lowered to a position adjacent to the housing case 10 in the front-rear direction. By the above procedure, the assembly of the packaging box 10 with respect to the housing case 10 is completed.

[0066] <<Regarding the blank according to this embodiment>> The packaging box 10 is constituted by a single blank 12 shown in FIG. 6. Note that the present invention is not limited to the packaging box 10 assembled from a single blank, and is also applicable to a packaging box assembled from a plurality of blank pieces. Hereinafter, it is assumed that the blank 12 is a corrugated sheet. In addition, hereinafter, unless otherwise specified, among the respective portions of the blank 12 in the unfolded state shown in FIG. 6, those having corresponding portions in the packaging box 10 described so far will be described using the same name, or the same name and the same reference numeral.

[0067] The blank 12 (that is, the blank 12 in the unfolded state) before the assembly of the packaging box 10 extends in a planar shape and extends in two main directions orthogonal to each other, as shown in FIG. 6. Hereinafter, one main direction will be referred to as the X direction, and the other main direction will be referred to as the Y direction. When the main surface wall 61 forming the reference portion of the blank 12 has a rectangular shape, the X direction corresponds to the short side direction of the main surface wall 61, and the Y direction corresponds to the long side direction of the main surface wall 61. In the present embodiment, the grain direction M (see FIG. 6) of the corrugated sheet forming the blank 12 is parallel to the X direction, but is not limited thereto. For example, it may be inclined at 45 degrees with respect to the X direction, or may be orthogonal to the X direction (i.e., parallel to the Y direction).

[0068] As shown in FIG. 6, the blank 12 is composed of an extension portion 30, a folding portion 41, an engaging portion 42, main surface walls 61 and 62, side walls 63 to 66, a joining piece 71, flaps 72 to 77, insertion pieces 78 and 79, and insertion openings 80 and 81. In the blank 12, the extension portion 30, the side wall 63, the main surface wall 61, the side wall 64, the main surface wall 62, and the joining piece 71 are arranged continuously in the X direction in this order. Also, at the position of the main surface wall 61, the flap 72, the side wall 65, the main surface wall 61, the side wall 66, and the flap 73 are arranged continuously in the Y direction in this order, and at the position of the extension portion 30, the engaging portion 42, the folding portion 41, the extension portion 30, the folding portion 41, and the engaging portion 42 are arranged continuously in the Y direction in this order. An insertion opening 80 is formed at the boundary portion between the flap 72 and the side wall 65, and an insertion opening 81 is formed at the boundary portion between the flap 73 and the side wall 66.

[0069] Flaps 74 and 75 are respectively located at both ends in the Y direction of the side wall 63 (corresponding to the upper wall 21). Flaps 76 and 77 are respectively located at both ends in the Y direction of the side wall 64. Tongue-shaped insertion pieces 78 and 79 are respectively located at both end portions in the Y direction of the main surface wall 62. The insertion pieces 78 and 79 extend outward with the base ends at positions shifted inward from the ends of the main surface wall 62 in the Y direction, and protrude outward from the ends of the main surface wall 62 in the Y direction.

[0070] Next, an example of the procedure for folding the blank 12 to assemble the packaging box 10 will be described. Unless otherwise specified, each part of the blank 12 is to be folded (erected) along the folding lines formed at the boundary portions between the parts.

[0071] First, four side walls 63 to 66 are erected along the four sides of the main surface wall 61. Then, in the side wall 64 rising from the main surface wall 61, the main surface wall 62 on the side opposite to the main surface wall 61 is bent to face the main surface walls 61 and 62 towards each other. At this time, the flaps 72 to 77 and the joining pieces 71 are bent in advance and inserted into the gaps between the walls adjacent to each other among the main surface walls 61 and 62 and the side walls 63 to 66. For the joining piece 71, it is fixed to the inner surface of the side wall 63 with an adhesive or the like. Also, the insertion piece 78 is inserted into the insertion port 80, and the insertion piece 79 is inserted into the insertion port 81. Thereby, the assembly of the box body 20 is completed. Then, when delivering the packaging box 10, the protruding portion 40 is folded toward the extending portion 30 side, and the extending portion 30 is folded toward the box body 20 side. On the other hand, when assembling the packaging box 10 to the storage case 100, the folded extending portion 30 and protruding portion 40 are expanded, and with the two boundary portions 52 and 53 as the bases, the protruding portion 40 is folded back twice. By the above procedures, the assembly from the blank 12 to the packaging box 10 is completed.

[0072] <<Other Embodiments>> <First Variation Example> In the above embodiment, in order to compactly accommodate the packaging box 10 in the outer packaging box for delivery, the width of the extending portion 30 in the left - right direction is set to be equal to or less than the width of the box body 20 in the left - right direction. Therefore, for example, when it is desired to reduce the width of the box body 20 in the left - right direction according to the size of the item to be accommodated in the box body 20, it is necessary to reduce the width of the extending portion 30 in the left - right direction. On the other hand, since the width of the extending portion 30 in the left - right direction is larger than the width of the storage case 100 in the left - right direction, if the width of the storage case 100 in the left - right direction is large, as a result, the width of the box body 20 in the left - right direction will also become large. For this reason, there is a possibility that the width of the box body 20 in the left - right direction becomes larger than necessary compared to the size of the item to be stored in the box body 20.

[0073] Regarding this, like the packaging box 10A shown in FIG. 7, the extending portion 30A may have an extension portion 33A that projects outward from the box body 20 in the left - right direction. In FIG. 7, similar to FIG. 2, the protruding portion 40 on the right side in the figure is in a state of being removed from the storage case 100 for the sake of convenience of explanation.

[0074] More specifically, the extending portion 30A has a main body portion 32A and two extension portions 33A. The main body portion 32A is plate - shaped and extends from the front - rear end of the upper wall 21 of the box body 20, more specifically, from the end on the storage - case - 100 side in the front - rear direction of the upper wall 21. The width (maximum width) of the main body portion 32A in the left - right direction is equal to or less than the width (maximum width) of the box body 20 in the left - right direction. The extension portions 33A are plate - shaped and project from both ends of the main body portion 32A in the left - right direction respectively. The shape of the extension portion 33A is, for example, trapezoidal with the width in the front - rear direction becoming narrower toward the side away from the box body 20 in the left - right direction.

[0075] Here, between the main body portion 32A and the extension portion 33, there is a boundary portion 54A that extends linearly in the front - rear direction, and a folding line (ruled line or perforation, etc.) (not shown) is formed along the extending direction of the boundary portion 54. Thus, when packing the packaging box 10 into an outer packaging box for delivery, the extension portion 33A and the protruding portion 40 can be folded so as to overlap the main body portion 32A with the boundary portion 54A as a base point. Thereby, the packaging box 10 can be compactly accommodated in the outer packaging box for delivery.

[0076] On the other hand, a folded - back portion 41 (protruding portion 40) projects from the end of the extension portion 33A in the left - right direction, and a boundary portion 52 exists between the extension portion 33A and the folded - back portion 41, similar to the above - described embodiment. Therefore, when assembling the packaging box 10 into the storage case 100, similar to the above - described embodiment, the folded - back portion 41 can be folded back with the boundary portion 52 as a base point. The position of the boundary portion 52 in the left - right direction is adjusted according to the length of the extension portion 33A in the left - right direction so as to be located outside the upper plate portion 101 in the left - right direction.

[0077] Thus, in the above-described embodiment, when packing the packaging box 10 into the outer packaging box for delivery, the position where the protruding portion 40 is folded back with respect to the extending portion 30 is the same as the position where the protruding portion 40 is folded back with respect to the extending portion 30 when assembling the packaging box 10 into the storage case 100. That is, in the above-described embodiment, one boundary portion (specifically, the boundary portion 52) has two functions, thereby reducing the number of boundary portions and making the packaging box 10 have a simpler configuration.

[0078] In contrast, in the example shown in FIG. 7, the above two functions are respectively divided into two boundary portions (specifically, the boundary portions 52 and 54A). Thereby, regardless of the width of the storage case 100 in the left-right direction, the width of the box body 20 in the left-right direction can be set to an appropriate width according to the size of the item stored in the box body 20, for example. Thus, in the example shown in FIG. 7, even when the width of the box body 20 in the left-right direction is smaller than the width of the storage case 100 in the left-right direction (strictly speaking, the width between the two recessed regions 101a), the protruding portion 40 can enter the storage case 100 from the outside in the left-right direction of the storage case 100.

[0079] Also, as in the packaging box 10A shown in FIG. 7, a recessed portion 55A may be provided at the end of the boundary portion 52 between the extending portion 30A (more specifically, the expanding portion 33A) and the protruding portion 40 (more specifically, the folding-back portion 41). The recessed portion 55A is provided at the end of the boundary portion 52. In the example shown in FIG. 7, it is provided at the end of the boundary portion 52 that is far from the box body 20 in the front-rear direction, and is recessed from that end toward the center in the front-rear direction of the boundary portion 52. The recessed shape of the recessed portion 55A is not particularly limited, and may be, for example, a circular shape, a rectangular shape, a U-shaped, a V-shaped, or the like. In the example shown in FIG. 7, the recessed portion 55A has a V-shaped, that is, a shape in which the width becomes smaller from the end in the front-rear direction of the boundary portion 52 toward the center.

[0080] As described above, when assembling the packaging box 10 into the storage case 100, the protruding portion 40 is inserted from the recessed area 101a of the storage case 100. However, if the width of the boundary portion 52 in the front-rear direction is larger than the width of the recessed area 101a in the front-rear direction, the boundary portion 52 cannot enter the inner area surrounded by the recessed area 101a. As a result, there is a possibility that the protruding portion 40 cannot be properly inserted between the upper plate portion 101 and the flange portion 201.

[0081] On the other hand, in the example shown in FIG. 7, by providing the recessed portion 55A at the end of the boundary portion 52, the length of the boundary portion 52 in the extending direction (front-rear direction) can be shortened. Therefore, the boundary portion 52 can appropriately enter the inner area surrounded by the recessed area 101a. As a result, the protruding portion 40 can be appropriately inserted between the upper plate portion 101 and the flange portion 201.

[0082] Note that the recessed portion 55A is not limited to being provided at the end of the boundary portion 52 on the side far from the box body 20 in the front-rear direction. For example, it may be provided at the end of the boundary portion 52 on the side close to the box body 20 in the front-rear direction, or may be provided at both ends of the boundary portion 52 in the front-rear direction. In particular, when the recessed portion 55A is provided at both ends of the boundary portion 52 in the front-rear direction, the arrangement position of the boundary portion 52 in the front-rear direction with respect to the extending portion 30A and the protruding portion 40 can be adjusted.

[0083] <Other Modification Examples> Also, in the above embodiment, it is assumed that the protruding portions 40 protrude from both ends of the extending portion 30 in the left-right direction. However, the present invention is not limited to this, and the protruding portion may protrude from only one end of the extending portion 30 in the left-right direction. Further, the protruding portion may protrude from the other end of the extending portion 30, specifically, from the end of the extending portion 30 on the side of the storage case 100 in the front-rear direction. Alternatively, the protruding portion may protrude from a location other than the end of the extending portion 30 (for example, a position shifted inward from the end of the extending portion 30 by a predetermined distance).

[0084] In addition, in the configuration where the protruding portion protrudes from the end on the housing case 100 side in the front-rear direction of the extending portion 30, the housing case to be assembled may be a cylindrical housing case with both ends in the front-rear direction open, which is different from the housing case 100 shown in FIG. 1. In this case, the extending portion 30 may enter between the upper plate portion of the housing case and the flange portion 201 of the object 200 to be housed together with the protruding portion, and may be in a state of being overlapped below the upper plate portion of the housing case. Further, the folding portion included in the protruding portion may be folded with the boundary portion between the extending portion 30 and the folding portion as a base point, and may extend downward while being inclined with respect to the horizontal direction toward the side approaching the box body 20 in the front-rear direction. Further, the engaging portion included in the protruding portion may be folded with the boundary portion between the folding portion and the engaging portion as a base end, and may extend downward while being inclined with respect to the horizontal direction toward the side away from the box body 20 in the front-rear direction, or may extend in the horizontal direction. Further, the edge portion forming the tip of the engaging portion faces the side away from the box body 20 in the front-rear direction and may contact the inner surface of the edge portion of the flange portion.

[0085] In the above embodiment, since the protruding portion 40 has the folding portion 41, two boundary portions 52, 53 are formed, and thus, the protruding portion 40 can be folded twice. However, it is not limited thereto. For example, the protruding portion 40 may have two or more folding portions connecting the extending portion 30 and the engaging portion 42. As a result, three or more boundary portions are formed, and folding three or more times is possible. Therefore, the pressing force downward on the engaging portion 42 is strengthened by the sum of the repulsive forces at three or more boundary portions. In other words, by increasing the number of folds, the spring pressure of the protruding portion 40 in the vertical direction increases. As a result, the engaging portion 42 can be more appropriately engaged with the flange portion 201 of the object 200 to be housed.

[0086] In the above-described embodiment, the edge portion 42a forming the tip of the engaging portion 42 faces away from the box body 20 in the left-right direction. However, the present invention is not limited to this. For example, depending on the number of folds in the protruding portion 40 (that is, the number of folding portions 41), the edge portion 42a forming the tip of the engaging portion 42 may face either the side approaching the box body 20 or the side moving away from the box body 20 in the left-right direction.

[0087] In the above-described embodiment, the extending portion 30 is assumed to extend from the upper wall 21. However, the present invention is not limited to this. The extending portion 30 may extend from other side walls of the box body 20. For example, the extending portion 30 may extend from the front and rear ends of the lower side wall of the box body 20.

[0088] In the above-described embodiment, the protruding portion 40 is assumed to have the folding portion 41 and the engaging portion 42. However, the present invention is not limited to this. For example, the protruding portion may have only the engaging portion without having the folding portion. In this case, in the protruding portion, folding is performed only once at the boundary portion with the extending portion 30.

[0089] In the above-described embodiment, both the folding line 53a and the cut portion 53b are formed in the boundary portion 53. However, the present invention is not limited to this. At least one of the folding line 53a and the cut portion 53b may be formed in the boundary portion 53. For example, only one folding line 53a may be formed, or only one cut portion 53b may be formed. Also, neither the folding line 53a nor the cut portion 53b needs to be formed in the boundary portion 53. Further, a plurality (two or more) of at least one of the folding line 53a and the cut portion 53b may be formed in the boundary portion 53. In the above-described embodiment, when the cut portion 53b is formed, it is premised that the tip cut portion 53c is formed. However, the present invention is not limited to this. Even when the cut portion 53b is formed, the tip cut portion 53c does not necessarily have to be formed.

[0090] Further, the positions where the bending line 53a and the notch 53b are formed in the boundary portion 53 are not particularly limited. For example, the bending line may be formed at the end of the boundary portion 53 that is far from the box body 20 or the near end in the front-rear direction. Further, the notch may be formed at the end of the boundary portion 53 that is near or far from the box body 20 in the front-rear direction, or may be formed at the central portion of the boundary portion 53 in the front-rear direction.

[0091] Also, in the above embodiment, the notch 53b and the tip notch 53c were formed only at the boundary portion 53 between the folded-back portion 41 and the engaging portion 42. However, the present invention is not limited to this, and notches corresponding to the notch 53b and the tip notch 53c may be provided at the boundary portion (that is, the foldable position) located between other parts of the packaging box 10. Such a notch restricts the interlocking of the protruding portion 40 (more specifically, the engaging portion 42) with other parts when the box body 20 moves with respect to the storage case 100. In other words, it suppresses the release of the engagement between the engaging portion 42 and the flange portion 201. From the viewpoint of restricting the interlocking of the engaging portion 42 with other parts, it is preferable that the formation position of the notch in the boundary portion is a position farther from the box body 20 in the extending direction of the boundary portion. In that regard, it can be said that the arrangement position of the notch 53b in the above embodiment is advantageous.

[0092] Also, in the above embodiment, it was assumed that bending lines were formed at the boundary portions existing between the respective parts of the packaging box 10. However, the present invention is not limited to this, and there may be boundary portions where no bending lines are formed. For example, in the above embodiment, bending lines 51a, 52a, and 53a were formed at the boundary portions 51, 52, and 53, respectively. However, in at least one of the boundary portions 51, 52, and 53, a bending line may not be formed, or in all of the boundary portions 51, 52, and 53, a bending line may not be formed.

Explanation of Reference Numerals

[0093] 10, 10A Packaging box 12 Blank 20 Box body 21 Upper wall (corresponding to one side wall) 30, 30A Extension part 31 Concave part 32A Main body part 33A Expansion part 40 Protrusion 41 Folding part 41a Tip part 42 Engaging part 42a Edge part 51, 52, 53, 54A Boundary part 51a Folding line (corresponding to the second folding line) 52a Folding line 53a Folding line (corresponding to the first folding line) 53b Notch part (protrusion side notch part, and corresponding to the notch part) 53c Tip notch part 55A Depression part 61, 62 Main surface wall 63 - 66 Side wall 71 Joining piece 72 - 77 Flap 78, 79 Insertion piece 80, 81 Insertion port 100 Storage case 101 Upper plate part (corresponding to one end part) 101a Concave region 101b Hole part 200 Object to be stored 201 Flange part S Gap

Claims

1. A packaging box that can be assembled to a storage case with an object to be stored inside, having a plurality of side walls, and a box body disposed at a position adjacent to the storage case in a first direction intersecting the vertical direction of the storage case; extending from an end of one of the side walls in the first direction, and in a state where the box body is adjacent to the storage case in the first direction, an extension portion that is overlapped with one end portion of the storage case in the vertical direction; projecting from the extension portion, and in a state where the box body is adjacent to the storage case in the first direction, a projecting portion that enters between the one end portion of the storage case and the object to be stored in the storage case.

2. The packaging box according to claim 1, wherein the projecting portion projects from an end of the extension portion in a second direction intersecting both the vertical direction and the first direction.

3. The packaging box according to claim 2, wherein a boundary portion between the projecting portion and the extension portion is located outside the one end portion of the storage case in the second direction in a state where the box body is adjacent to the storage case in the first direction, thereby forming a gap with the one end portion.

4. The projecting portion has a folded-back portion extending from an end of the extension portion and an engaging portion extending from a tip of the folded-back portion, the folded-back portion is folded back toward the object to be stored side in the vertical direction along a boundary portion between the extension portion and the folded-back portion in a state where the box body is adjacent to the storage case in the first direction, the engaging portion is folded back toward the object to be stored side in the vertical direction along a boundary portion between the folded-back portion and the engaging portion in a state where the box body is adjacent to the storage case in the first direction, and engages with a recess provided in the object to be stored.

5. The packaging box according to claim 4, wherein the folded-back portion enters between the one end portion of the storage case and the object to be stored in the storage case in a state where the box body is adjacent to the storage case in the first direction.

6. The packaging box according to claim 4, wherein a first folding line that enables the engaging portion to be bent with respect to the folded-back portion is formed at a boundary portion between the folded-back portion and the engaging portion.

7. The packaging box according to claim 4, wherein a cut portion on the projecting portion side is formed at a boundary portion between the folded-back portion and the engaging portion.

8. The protruding portion side cut portion is formed at the end on the side farther from the box body in the first direction among the boundary portions between the folded-back portion and the engaging portion when the box body is adjacent to the storage case in the first direction. The packaging box according to claim 7.

9. A second folding line that enables the extension portion to be folded with respect to the box body is formed at the boundary portion between the box body and the extension portion. The packaging box according to claim 1.

10. A recessed portion that is recessed toward the center of the boundary portion is provided at the end of the boundary portion between the extension portion and the protruding portion. The packaging box according to claim 1.

11. The extension portion has an extended portion that protrudes outside the box body in a second direction that intersects both the vertical direction and the first direction when the box body is adjacent to the storage case in the first direction. The protruding portion protrudes from the end of the extended portion in the second direction. The packaging box according to claim 1.

12. It is formed at a foldable position, and when the box body moves with respect to the storage case in a state where the box body is adjacent to the storage case in the first direction, it further includes a cut portion that restricts the interlocking of the protruding portion. The packaging box according to any one of claims 1 to 11.

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