Box body and blank sheet

Abstract

This invention provides a box that can be reused after its initial construction by folding and deforming the box. [Solution] The box body 100 is formed by folding a sheet material (blank sheet 200), and has two or more side parts, and one or more side parts, the first side parts (side part 12, etc.), have first creases L21, L22, L23, L24 extending in the vertical direction, and the first side parts can be folded inward in a convex shape along the first creases L21, L22, L23, L24.

Description

Technical Field

[0001] The present invention relates to a box body and a blank sheet.

Background Art

[0002] Patent Document 1 describes the after-use (reuse for another purpose after use) of a box body formed by folding a sheet material such as paper or plastic cardboard. More specifically, in the box body of Patent Document 1, ruled lines with a depth of half the paper thickness are engraved in a grid pattern on its top surface portion, and by peeling off the skin with the depth of the ruled lines from the paper material constituting the top surface portion, it is possible to create surface designs such as characters and patterns.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the inventor of the present application considered that by making the box body foldable and deformable in scenarios such as after-use, the box body would have a higher added value.

[0005] The present invention has been made in view of the above problems, and provides a box body and a blank sheet that can be folded and deformed in scenarios such as after-use.

Means for Solving the Problems

[0006] According to the present invention, there is provided a box body formed by folding a sheet material, comprising two or more side surface portions, One or more of the aforementioned side surfaces, specifically the first side surface, have a first grid line formed on them that extends in the vertical direction. A box body is provided in which the first side portion can be bent inward in a convex shape along the first score line.

[0007] Furthermore, according to the present invention, the blank sheet for the box body of the present invention is It has a first planned joining portion and a second planned joining portion that are joined to each other surface to form a joint portion, A blank sheet is provided in which the joint portion is formed by surface joining of the first planned joining portion and the second planned joining portion. [Effects of the Invention]

[0008] According to the present invention, the box can be bent and deformed in situations such as after-use. [Brief explanation of the drawing]

[0009] [Figure 1] This is a plan view (unfolded view) of a blank sheet for a box body according to the embodiment. [Figure 2] This is a perspective view showing the state in which the box body according to the embodiment is being assembled into the first form, with the joint portion formed to make the blank sheet into a rectangular tube shape and the bottom portion formed. [Figure 3] This is a plan cross-sectional view of the box body according to the embodiment assembled into the first form (a plan cross-sectional view at the position corresponding to line AA in Figure 1). [Figure 4] This is a perspective view of the box body according to the embodiment, assembled into the first form. [Figure 5] This is a perspective view of the box body according to the embodiment assembled into the first form (a perspective view from a different direction than that shown in Figure 4). [Figure 6] This is a front view of the box body according to the embodiment, assembled into the first form. [Figure 7] This is a plan view of the box body according to the embodiment assembled into the first form. [Figure 8]It is a perspective view showing a state during the assembly of the box body according to the embodiment into the second form, showing a state where each side surface portion stands upright vertically. [Figure 9] It is a front view showing a state during the assembly of the box body according to the embodiment into the second form, showing a state where each side surface portion stands upright vertically. [Figure 10] It is a perspective view showing a state during the assembly of the box body according to the embodiment into the second form, showing a state where each first side surface portion starts to be bent convexly inward. [Figure 11] It is a front view showing a state during the assembly of the box body according to the embodiment into the second form, showing a state after each first side surface portion is bent convexly inward and before the second top surface portion is completed. [Figure 12] It is a front view of the box body according to the embodiment assembled into the second form. [Figure 13] It is a perspective view of the box body according to the embodiment assembled into the second form. [Figure 14] It is a perspective view showing a state where the box body according to the embodiment is assembled into the second form and used as a lantern hat (lantern shade). [Figure 15] It is a plan view showing a state where the box body according to the embodiment is assembled into the second form and used as a lantern hat (lantern shade). [Figure 16] It is a bottom view of the box body according to the embodiment assembled into the second form. [Figure 17] It is a cross-sectional plan view (cross-sectional plan view at a position corresponding to the A-A line in FIG. 1) of the box body according to the embodiment assembled into the second form. [Figure 18] It is a plan view (development view) of the blank sheet for the box body according to the embodiment, showing an excerpt of the portion that becomes the second form.

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 18. In all the drawings, the same reference numerals are assigned to the same components, and the description will be omitted as appropriate.

[0011] In this specification, unless otherwise specified, the description of the positional relationship (such as the vertical relationship) of each component of the box body 100 or the blank sheet 200 is based on the positional relationship in the state where each side surface of the box body 100 is vertically erected as shown in FIG. 2 or FIG. 8. The positional relationships in these descriptions do not necessarily coincide with the positional relationships before, during, or after the assembly of the box body 100. In addition, the positional relationship of each component of the box body 100 or the blank sheet 200 may also be described in terms of the positional relationship in each drawing. The "vertical direction", "horizontal direction", "orthogonal", and "parallel" in this specification shall include the range of errors acceptable in the technical field to which the present invention pertains. For example, the "vertical direction", "horizontal direction", "orthogonal", and "parallel" in this specification, unless otherwise specified, mean within a range of less than ±10° with respect to the strict vertical direction (vertical direction), strict horizontal direction, strict orthogonal, or strict parallel. In addition, the error from the strict vertical direction, strict horizontal direction, strict orthogonal, or strict parallel is preferably ±5° or less, and more preferably ±3° or less. In addition, as will be described later, in particular, the "vertical direction" indicating the extending direction of the first ruled line means a direction having a vertical component and may be inclined by more than 10° with respect to the vertical direction. Also, regarding the positional relationship and dimensions of each component, matters described as "(mutually) identical", "(mutually) equal", etc. also include the range of errors acceptable in the technical field to which the present invention pertains. For example, it means within an error range of less than ±10%, but is preferably within an error range of ±5% or less, and more preferably within an error range of ±3% or less.

[0012] The box body 100 according to this embodiment is formed by folding a sheet material (blank sheet 200 shown in Figure 1), and has two or more side parts (in this embodiment, four side parts 11, 12, 13, 14), and one or more side parts, which are first side parts (in this embodiment, side parts 12 and 14), have first creases L21, L22, L23, L24 extending in the vertical direction, and the first side parts can be folded inward convexly along the first creases L21, L22, L23, L24. That is, the first side parts can be folded inward into valley folds along the first creases L21, L22, L23, L24. Here, "inside of box 100" refers to the inward-facing side of box 100, and "outside of box 100" refers to the outward-facing side of box 100. Furthermore, the inner surface of box 100 is referred to as the inner surface, and the outer surface of box 100 is referred to as the outer surface. Furthermore, the blank sheet 200 according to this embodiment is a blank sheet 200 for the box body 100 according to this embodiment, and has a first planned joining portion 15 and a second planned joining portion 16 that are joined to each other to form a joint portion, and the joint portion is formed when the first planned joining portion 15 and the second planned joining portion 16 are joined to each other.

[0013] As described above, the first grid lines L21, L22, L23, and L24 extend in the vertical direction. This means that when the first side surface is standing vertically, the first grid lines L21, L22, L23, and L24 extend in the vertical direction. The term "vertical direction" here does not necessarily mean a strictly vertical direction, but includes all directions that have a vertical component. The "vertical direction" here is preferably a direction inclined with respect to the vertical direction, but it may also be a strictly vertical direction. In this embodiment, the first grid lines L21, L22, L23, and L24 extend in an inclined direction that is inclined with respect to the vertical direction. The number of side sections of the box body 100 is not particularly limited as long as it is two or more, but from the viewpoint of the structural stability of the box body 100, it is preferable that the number of side sections be three or more, and more preferably four or more. The number of side sections may also be five or more (for example, six or eight). One or more of the side surfaces of the box body 100 are first side surfaces (side surfaces having a first ruled line). All of the side surfaces of the box body 100 may be first side surfaces, but in this embodiment, the box body 100 has four side surfaces 11, 12, 13, and 14, of which side surfaces 12 and 14 are first side surfaces.

[0014] According to this embodiment, the first side portion can be folded inward in a convex shape along the first scribed lines L21, L22, L23, and L24, so that the box body 100 can be folded and deformed in situations such as after-use. By folding the first side portion inward in a convex shape along the first lines L21, L22, L23, and L24, the portion of the first side portion where the first lines L21, L22, L23, and L24 are formed (the portion of the first side portion in the vertical direction where the first lines are formed) can be tilted inward. As a result, the distance between the first side portion and the other side portion opposite to the first side portion (the other side portion here refers to one or more side portions) decreases. In this embodiment, the distance between side portion 12 and side portion 14 decreases in the depth direction of the paper in Figure 9. Therefore, for example, an object to be locked can be locked to the first side portion and the other side portion, thereby suspending the object inside the box 100, or the first side portion and the other side portion can be locked to the object to be locked, thereby suspending the box 100 from the object. Figure 14 shows an example in which a box body 100 is suspended from a container 300, such as a PET bottle, which is the object to be secured, and the box body 100 is used as a lantern shade. For example, by shining the light from the lighting device 400 from the bottom surface of the container 300, the light is scattered by the container 300, and indirect lighting can be directed out around the container 300. Furthermore, by directing this light out from the box body 100, a lantern can be easily constructed using the combination of the box body 100, the container 300, and the lighting device 400. As the lighting device 400, a smartphone or other device equipped with a light-emitting function such as an LED light can be used. The object to be secured may be something other than container 300 (for example, a lighting fixture). Furthermore, the box body 100 can be made into a house-shaped form (second form 100b, described later) having a sloping roof (second top surface 62, described later), and can be used, for example, as a house-shaped toy box for children. In this way, by allowing the box 100 to be folded and deformed in after-use situations, it is possible to make the box 100 a more valuable component. Furthermore, users can also enjoy the process of modifying the box 100 for after-sales use.

[0015] The embodiment will be described in more detail below.

[0016] First, let's explain the blank sheet 200 using Figure 1. The blank sheet 200 is a flat, sheet-like (thin) material. The material of the blank sheet 200 is not particularly limited as long as it is a material that can be bent and deformed, but examples include paper materials such as so-called cardboard, corrugated paper materials, and corrugated plastic. In this embodiment, the blank sheet 200 is made of paper material, and its grain direction 201 is, for example, horizontal. In the blank sheet 200, the surface that will become the outer surface of the box body 100 is, for example, a decorative surface with printing applied to it. The decorative surface has better light reflectivity compared to the inner surface of the box body 100. The outer surface of the box body 100 may be treated with a surface treatment such as a heat-resistant coating or a weather-resistant coating.

[0017] The following details each part of the blank sheet 200. Here, the positional relationships of each part of the blank sheet 200 (up / down, left / right, etc.) will be explained based on the positional relationships shown in Figure 1. The blank sheet 200 has multiple grid lines that form the boundaries of different parts of the blank sheet 200, and the blank sheet 200 can be easily folded along the grid lines. In each figure, for convenience, the grid lines in the unfolded state are shown as dotted lines (although they are not hidden lines). On the other hand, the grid lines in the folded state are shown as solid lines.

[0018] The blank sheet 200 has, in order from left to right in Figure 1, a first planned joining portion 15, and a total of four side portions: side portion 11, side portion 12, side portion 13, and side portion 14. A boundary line L1 extending in the vertical direction is formed at the boundary between the first planned joint portion 15 and the side portion 11. A boundary line L2 extending in the vertical direction is formed at the boundary between the side portion 11 and the side portion 12. A boundary line L3 extending in the vertical direction is formed at the boundary between the side portion 12 and the side portion 13. A boundary line L4 extending in the vertical direction is formed at the boundary between the side portion 13 and the side portion 14. Each boundary line L1, L2, L3, and L4 extends vertically across the blank sheet 200. However, in this embodiment, the intermediate portions of each boundary line L1, L2, L3, and L4 are partially separated by, for example, the presence of side openings 29A and 29B, which will be described later.

[0019] The first planned joint section 15 and each side section 11, 12, 13, and 14 are each divided into multiple sections vertically, with horizontally extending grid lines (grid lines L6, L7, L8, L9, and L10, described later) as boundaries. The first planned joint portion 15 has, in order from its bottom, a first portion 15a, a second portion 15b, and a third portion 15c. The side portion 11 has, in order from the bottom, a first portion 11a, a second portion 11b, and a third portion 11c, and further has an insertion piece 21 provided on the upper side of the third portion 11c (the upper end of the side portion 11). The side portion 12 has, in order from the bottom, a first portion 12a, a second portion 12b, and a third portion 12c. The side portion 13 has, in order from the bottom, a first portion 13a, a second portion 13b, a third portion 13c, and a fourth portion 13d, and further has an insertion piece 22 provided on the upper side of the fourth portion 13d (the upper end of the side portion 13). The side portion 14 has, in order from the bottom, a first portion 14a, a second portion 14b, and a third portion 14c.

[0020] The blank sheet 200 has ruled lines L6 and L7 formed on it, which extend horizontally between both ends of the blank sheet 200 in the horizontal direction. The ruled line L6 forms the boundary between the first part 15a and the second part 15b, the boundary between the first part 11a and the second part 11b, the boundary between the first part 12a and the second part 12b, the boundary between the first part 13a and the second part 13b, and the boundary between the first part 14a and the second part 14b. The ruled line L7 forms the boundary between the second section 15b and the third section 15c, the boundary between the second section 11b and the third section 11c, the boundary between the second section 12b and the third section 12c, the boundary between the second section 13b and the third section 13c, and the boundary between the second section 14b and the third section 14c. The blank sheet 200 further has a grid line L8 forming the boundary between the third portion 11c and the insert piece 21, a grid line L9 forming the boundary between the third portion 13c and the fourth portion 13d, and a grid line L10 forming the boundary between the fourth portion 13d and the insert piece 22, each extending horizontally.

[0021] Therefore, in the vertical direction, the position of the upper edge of the first part 15a (the position of the lower edge of the second part 15b), the position of the upper edge of the first part 11a (the position of the lower edge of the second part 11b), the position of the upper edge of the first part 12a (the position of the lower edge of the second part 12b), the position of the upper edge of the first part 13a (the position of the lower edge of the second part 13b), and the position of the upper edge of the first part 14a (the position of the lower edge of the second part 14b) are the same as each other. Similarly, in the vertical direction, the position of the upper edge of the second part 15b (the position of the lower edge of the third part 15c), the position of the upper edge of the second part 11b (the position of the lower edge of the third part 11c), the position of the upper edge of the second part 12b (the position of the lower edge of the third part 12c), the position of the upper edge of the second part 13b (the position of the lower edge of the third part 13c), and the position of the upper edge of the second part 14b (the position of the lower edge of the third part 14c) are identical to each other.

[0022] Furthermore, in the vertical direction, the positions of the upper end of the third portion 15c, the upper edge of the third portion 13c (the lower edge of the insert piece 21), the upper end of the third portion 12c (the upper end of the inclined edge 27b described later), the upper edge of the third portion 13c (the lower edge of the fourth portion 13d), and the upper end of the third portion 14c (the upper end of the inclined edge 27b described later) are all the same. In the vertical direction, the positions of grid lines L8 and L9 are identical.

[0023] Furthermore, in the vertical direction, the position of the lower end of the first part 15a, the position of the lower edge of the first part 11a, the position of the lower edge of the first part 12a, the position of the lower edge of the first part 13a, and the position of the lower edge of the first part 14a are all the same.

[0024] The blank sheet 200 further has a plurality of flaps that form the bottom surface 51 in the first embodiment 100a. For example, the bottom surface 51 is formed by a pair of outer flaps 17 and a pair of inner flaps 18. Each outer flap 17 is provided below the first portion 11a and below the first portion 13a, respectively, and each inner flap 18 is provided below the first portion 12a and below the first portion 14a, respectively. The blank sheet 200 further has the following lines formed on it: a ruled line L5 forming the boundary between the first part 11a and the outer flap 17, a ruled line L5 forming the boundary between the first part 12a and the inner flap 18, a ruled line L5 forming the boundary between the first part 13a and the outer flap 17, and a ruled line L5 forming the boundary between the first part 14a and the inner flap 18. Each grid line L5 extends horizontally and is positioned at the same location in the vertical direction.

[0025] The first planned joining portion 15 is formed in a roughly rectangular shape that is elongated vertically. More specifically, the first planned joining portion 15 is formed in a trapezoidal shape, for example, with its vertical dimension narrowing toward the left side (the side away from the side portion 11).

[0026] The second planned joining portion 16 is a part (right edge) of the side portion 14. The second planned joining portion 16 overlaps with the first planned joining portion 15 and is the portion that is surface-joined with the first planned joining portion 15. By joining the first planned joining portion 15 and the second planned joining portion 16 to each other (for example, by adhesive) to form a joint portion, the multiple side portions 11, 12, 13, and 14 can be arranged in a series of loop-shaped (annular) configurations (see Figures 2 and 3, etc.). Furthermore, in the state where the joint portion is formed, the first planned joint portion 15 can be considered to be included in the side portion 14 (becoming a part of the side portion 14).

[0027] Each of the side sections 11, 12, 13, and 14 is formed in a roughly rectangular shape that is elongated vertically.

[0028] More specifically, in the side portion 11, the portion excluding the insertion piece 21 (the whole of the first portion 11a, the second portion 11b, and the third portion 11c) is formed in a rectangular shape, and each of the first portion 11a, the second portion 11b, and the third portion 11c is also formed in a rectangular shape. The insertion piece 21 is formed in a roughly rectangular shape, elongated from left to right. More specifically, the insertion piece 21 is formed in a trapezoidal shape, for example, with its left and right dimensions narrowing towards the top (the side away from the third portion 11c), and the left and right corners on the top of the insertion piece 21 are rounded.

[0029] Furthermore, in the side portion 12, the portion excluding the third portion 12c (the whole of the first portion 12a and the second portion 12b) is formed in a rectangular shape, and each of the first portion 12a and the second portion 12b is also formed in a rectangular shape. The third section 12c has a rectangular upper edge that is cut out in an inverted trapezoidal shape towards the bottom. In other words, the side portion 12 has a notched shape 27 that is carved out downward from the upper edge of the side portion 12.

[0030] Furthermore, in the side portion 13, the portion excluding the insertion piece 22 (the whole of the first portion 13a, second portion 13b, third portion 13c, and fourth portion 13d) is formed in a rectangular shape, and each of the first portion 13a, second portion 13b, third portion 13c, and fourth portion 13d is also formed in a rectangular shape. Furthermore, the upper left and right corners of section 4, 13d, are rounded. The insertion piece 22 is formed in a roughly rectangular shape, elongated from left to right. However, the width dimension of the insertion piece 22 is smaller than the width dimension of the side portion 13, and the insertion piece 22 is positioned in the center of the side portion 13 in the lateral direction. For example, the upper left and right corners of the insertion piece 22 are rounded.

[0031] Furthermore, in the side portion 14, the portion excluding the third portion 14c (the whole of the first portion 14a and the second portion 14b) is formed in a rectangular shape, and each of the first portion 14a and the second portion 14b is also formed in a rectangular shape. Part 3, 14c, has a rectangular upper edge that is notched downwards in an inverted trapezoidal shape. In other words, the side portion 14 has a notched shape 27 that is carved out downward from the upper edge of the side portion 14. Furthermore, the side portion 14 is formed to have the same shape and dimensions as the side portion 12, including the grid lines, except for the side openings 28, 29A, and 29B which will be described later.

[0032] Each outer flap 17 has a roughly rectangular shape with a triangular cutout in the center of its lower edge that extends upwards. In other words, each outer flap 17 has a triangular cutout portion 17a in the center of its lower edge. Each outer flap 17 has a scribed line L13 that extends diagonally at an angle of approximately 45 degrees. The scribe line L13 of the lower outer flap 17 of the first part 11a extends from the deepest point (the uppermost point) of the notched portion 17a to the vicinity of one end of the base of the outer flap 17 (the vicinity of one end (for example, the right end) of the scribe line L5 that forms the boundary between the first part 11a and the outer flap 17). Similarly, the scribe line L13 of the lower outer flap 17 of the first portion 13a extends from the deepest point (the uppermost point) in the notched portion 17a to the vicinity of one end of the base of the outer flap 17 (the vicinity of one end (for example, the right end) of the scribe line L5 that forms the boundary between the first portion 13a and the outer flap 17). Each inner flap 18 is formed in an inverted trapezoidal shape (a trapezoid where the lower base is shorter than the upper base).

[0033] The blank sheet 200 has side openings 28, 29A, and 29B formed on its side (any of the side sections 11, 12, 13, and 14). The side openings 28, 29A, and 29B penetrate through the front and back of the blank sheet 200. When the blank sheet 200 is assembled into a box 100, the side openings 28, 29A, and 29B become openings that penetrate through the inside and outside of the box 100. Since the box body 100 has side openings 28, 29A, and 29B formed on its side, when the box body 100 is used as a lantern shade, light can be guided from the inside of the box body 100 to the outside through the side openings 28, 29A, and 29B. Furthermore, when the box-shaped body 100 is in the form of a house with a roof (the second form 100b described later), the side openings 28, 29A, and 29B can be made to look like windows of a house.

[0034] The side openings 28 are formed in one or more side sections. In this embodiment, each of the side sections 11, 12, 13, and 14 has a side opening 28. More specifically, each of the side sections 11, 12, 13, and 14 has multiple side openings 28 that mimic the windows of a house. The shape, number, and arrangement of the side openings 28 in each side section 11, 12, 13, and 14 may be the same or different from one another. In this embodiment, the shape, number, and arrangement of the side openings 28 are the same in side section 11 and side section 13, but the shape, number, and arrangement of the side openings 28 in side section 12 are different from those in the other side sections, and the shape, number, and arrangement of the side openings 28 in side section 14 are also different from those in the other side sections. More specifically, the first section 11a and the first section 13a each have multiple (e.g., four) vertically elongated rectangular side openings 28 arranged side by side. In the first part 12a, multiple (e.g., six) side openings 28 are arranged in a grid pattern within a circular area. In the second section 12b and the second section 14b, multiple (for example, three) vertically elongated rectangular side openings 28 are arranged side by side. In the first part 14a, multiple (for example, four) vertically elongated rectangular side openings 28 are arranged side by side, but the arrangement of these side openings 28 differs from the arrangement in the first part 11a and the first part 13a. The shape, number, and arrangement of the side openings 28 described herein are merely examples, and the side openings 28 may be formed in other shapes, numbers, and arrangements.

[0035] In this embodiment, these side openings 28 open in a region on one side (any of side 11, 12, 13, or 14) that is spaced apart from the boundary lines L1, L2, L3, L4 and their extensions that form the boundary between adjacent side halves (the portion partially separated by the presence of side openings 29A and 29B). That is, at least one side opening (side opening 28) opens in a region on one side that is spaced apart from the boundary lines L1, L2, L3, L4 and their extensions that form the boundary between adjacent side halves. As a result, the side opening 28 is positioned closer to the center on one side, which improves the efficiency (ratio) of light extraction from inside the box 100, and makes the side opening 28 look more like a window in a house. However, the present invention is not limited to this example, and the side opening 28 may be positioned in contact with any of the boundary lines L1, L2, L3, L4, or it may be positioned to straddle the boundary lines L1, L2, L3, L4 horizontally (straddle multiple side sections).

[0036] As mentioned above, the first grid lines L21, L22, L23, and L24 extend in the direction of inclination. Furthermore, each side opening 29A, 29B is an intersection opening that opens into a region that includes at least the intersection points (intersections P1, P2) of the extensions of the first line (any of the first line L21, L22, L23, L24) and the boundary line (any of the boundary lines L1, L2, L3, L4) that forms the boundary between adjacent side sections. Note that intersection point P1 is a hypothetical intersection point between each boundary line L1, L2, L3, L4 and line L6, and intersection point P2 is a hypothetical intersection point between each boundary line L1, L2, L3, L4 and line L7. The blank sheet 200 (box body 100) has intersection openings at the intersections of the ruled lines, that is, the intersection openings are located where multiple fold lines converge, which allows the blank sheet 200 to be neatly folded along each ruled line while suppressing the occurrence of wrinkles and creases in the blank sheet 200. The number of side openings 29A and 29B provided by the blank sheet 200 (or the box body 100) is not particularly limited, and when the blank sheet 200 (or box body 100) has side openings 29A and 29B, the number of such side openings 29A and 29B is one or more. In other words, at least one side opening 29A, 29B is an intersection opening that opens into a region that includes at least the intersection point (intersection point P1 or P2) of the extensions of the first line and the boundary line forming the boundary between adjacent side portions. In this context, intersection P1 is included in (contained by) the side opening 29A, and intersection P2 is included in (contained by) the side opening 29B. Therefore, these are not actual intersections existing on the blank sheet 200, but rather virtual intersections of a virtual extension of the first grid line and a virtual extension of the boundary grid line.

[0037] In this embodiment, the shape of the side openings 29A and 29B (intersection openings) is a right triangle, with the right angle located at intersection point P1 or P2. In this embodiment, one point on the outline of the side openings 29A and 29B is intersection point P1 or P2. However, in the present invention, the shape of the side openings 29A and 29B is not limited to this example, and it is sufficient that the openings extend to an area that includes at least the intersections (intersections P1 and P2). If one point on the outline of the side openings 29A and 29B is the intersection P1 or intersection P2, the shape of the side openings 29A and 29B may be, for example, a quadrilateral with right angles. Furthermore, the side openings 29A and 29B may be positioned to straddle the first grid line or to straddle the boundary grid line. For this reason, (when the blank sheet 200 is laid flat) the intersection P1 or intersection P2 may be located inside the outline of the side openings 29A and 29B.

[0038] In this embodiment, the side openings 29A are located at each of the lower left and right corners of the second portion 12b and at each of the lower left and right corners of the second portion 14b. The side openings 29B are located at each of the lower left and right corners of the third portion 12c and at each of the lower left and right corners of the third portion 14c. The positions where the side openings 29A and 29B are located also coincide with the lower end positions of the first grid lines L21, L22, L23, and L24. In addition, side openings 29A and 29B are formed at the lower ends of the second section 15b and the third section 15c, respectively. Of these, the outline of the side opening 29A at the lower end of the second section 15b coincides with the outline of the side opening 29A at the lower right corner of the second section 14b when the joint is formed, and these two side openings 29A overlap and join together in the thickness direction of the sheet material to form a single side opening 29A. Similarly, the outline of the side opening 29B at the lower end of the third section 15c coincides with the outline of the side opening 29B at the lower right corner of the third section 14c when the joint is formed, and these two side openings 29B overlap and join together in the thickness direction of the sheet material to form a single side opening 29B. In the blank sheet 200 state, the right edge of the side portion 14 is the right edge of the blank sheet 200, and there are no other side portions (or planned joining portions) to the right of the side portion 14. Therefore, in the blank sheet 200 state, the side opening 29A at the lower right corner of the second portion 14b and the side opening 29B at the lower right corner of the third portion 14c are not openings that are entirely surrounded by a part of the blank sheet 200, but rather notched portions with an open right edge.

[0039] Here, the notched portions 27 of the side portions 12 and 14 (the third portions 12c and 14c) will be described in more detail. As described above, the notched portion 27 is inverted trapezoidal. Therefore, the lower edge 27a of the notched portion 27 extends horizontally. The notched portion 27 has inclined edges 27b on both the left and right sides of its lower edge 27a. The left-side sloping edge 27b extends upward and to the left from the left end of the lower edge 27a. In other words, it slopes upward to the left. The right-side sloping edge 27b extends upward and to the right from the rightmost end of the lower edge 27a. In other words, it slopes upward to the right. The notched portion 27 has a symmetrical shape.

[0040] The upper end (leftmost) position of the left inclined edge 27b in the notched portion 27 of the side portion 12 is at the upper right corner of the third portion 11c. The upper end (rightmost) position of the right inclined edge 27b in the notched portion 27 of the side portion 12 is at the upper left corner of the third portion 13c. The center of the notched portion 27 of the side portion 12 in the width direction coincides with the center of the side portion 12 in the width direction. Similarly, the upper end (leftmost end) of the left inclined edge 27b in the notched portion 27 of the side portion 14 is at the upper right corner of the third portion 13c. The upper end (rightmost end) of the right inclined edge 27b in the notched portion 27 of the side portion 14, when the joint portion is formed, is approximately at the upper left corner of the third portion 11c. The center of the notched portion 27 of the side portion 14 in the width direction coincides with the center of the side portion 14 in the width direction. Furthermore, the notched portion 27 of the side portion 12 and the notched portion 27 of the side portion 14 are formed to be the same shape and dimensions as each other. When the box body 100 is assembled and the side portions 12 and 14 are facing each other, when viewed in the direction of opposition, that is, when viewed from the front as shown in Figure 9, the notched portion 27 of the side portion 12 and the notched portion 27 of the side portion 14 overlap (conform to each other).

[0041] In this invention, the shape of the notched portion 27 is not limited to this example, and may be, for example, semicircular or asymmetrical. Furthermore, if notched portions 27 are formed on opposite side surfaces, the shapes of these notched portions 27 may be different from each other. Furthermore, the notched portion 27 may be formed on only one of the opposing side portions.

[0042] Next, we will describe each of the first grid lines L21, L22, L23, and L24 in detail. In this embodiment, first grid lines L21, L22, L23, and L24 are formed on the side portion 12 and the side portion 14, respectively.

[0043] The first scribe line L21 of the side portion 12 extends downward to the left from a position between both ends of the inclined edge 27b on the left side of the notched portion 27 of the side portion 12 (for example, a position below the intermediate position) toward the lower left corner of the third portion 12c (a hypothetical intersection point P2 between the boundary scribe line L2 and the scribe line L7). Therefore, the lower end of the first scribe line L21 of the side portion 12 is located on the outline of the side opening 29B at the lower left corner of the third portion 12c (on the hypotenuse of a right triangle). The first scribe line L22 of the side portion 12 extends downward to the left from the left end position of the lower edge 27a of the notched portion 27 of the side portion 12 (the lower end position (right end position) of the left inclined edge 27b of the notched portion 27 of the side portion 12) toward the lower left corner of the second portion 12b (the imaginary intersection point P1 of the boundary scribe line L2 and the scribe line L6). Therefore, the lower end of the first scribe line L22 of the side portion 12 is located on the outline of the side opening 29A at the lower left corner of the second portion 12b (on the hypotenuse of a right triangle), and is located below the lower end of the first scribe line L21 of the side portion 12. The first scribe line L23 of the side portion 12 extends downward to the right from the right end position of the lower edge 27a of the notched portion 27 of the side portion 12 (the lower end position (left end position) of the right-side inclined edge 27b of the notched portion 27 of the side portion 12) toward the lower right corner of the second portion 12b (the imaginary intersection point P1 of the boundary scribe line L3 and the scribe line L6). Therefore, the lower end of the first scribe line L23 of the side portion 12 is located on the outline of the side opening 29A at the lower right corner of the second portion 12b (on the hypotenuse of a right triangle). The first scribe line L24 of the side portion 12 extends downward to the right from a position between both ends of the right-hand inclined edge 27b of the notched portion 27 of the side portion 12 (for example, a position below the intermediate position) toward the lower right corner of the third portion 12c (a hypothetical intersection point P2 between the boundary scribe line L3 and the scribe line L7). Therefore, the lower end of the first scribe line L24 of the side portion 12 is located on the outline of the side opening 29B at the lower right corner of the third portion 12c (on the hypotenuse of a right triangle), and is located above the lower end of the first scribe line L23 of the side portion 12. Here, the first ruled line L21 and the first ruled line L24 form a pair and are arranged symmetrically on the side surface 12. The first ruled line L21 and the first ruled line L24 are arranged in a V-shape. Furthermore, the first ruled line L22 and the first ruled line L23 form a pair and are arranged symmetrically on the side surface 12. The first ruled line L22 and the first ruled line L23 are arranged in a V-shape. The first grid lines L21 and L24 are positioned on the outside, with the first grid lines L22 and L23 in between.

[0044] The first scribe line L24 of the side portion 14 extends downward to the left from a position between both ends of the inclined edge 27b on the left side of the notched portion 27 of the side portion 14 (for example, a position below the intermediate position) toward the lower left corner of the third portion 14c (a hypothetical intersection point P2 between the boundary scribe line L4 and the scribe line L7). Therefore, the lower end of the first scribe line L24 of the side portion 14 is located on the outline of the side opening 29B at the lower left corner of the third portion 14c (on the hypotenuse of a right triangle). The first scribe line L23 of the side portion 14 extends downward to the left from the left end position of the lower edge 27a of the notched portion 27 of the side portion 14 (the lower end position (right end position) of the left inclined edge 27b of the notched portion 27 of the side portion 14) toward the lower left corner of the second portion 14b (the imaginary intersection point P1 of the boundary scribe line L4 and the scribe line L6). Therefore, the lower end of the first scribe line L23 of the side portion 14 is located on the outline of the side opening 29A at the lower left corner of the second portion 14b (on the hypotenuse of a right triangle), and is located below the lower end of the first scribe line L24 of the side portion 14. The first scribe line L22 of the side portion 14 extends downward to the right from the right end position of the lower edge 27a of the notched portion 27 of the side portion 14 (the lower end position (left end position) of the right-side inclined edge 27b of the notched portion 27 of the side portion 14) toward the lower right corner of the second portion 14b (the imaginary intersection point P1 of the boundary scribe line L1 and the scribe line L6 when the joint portion is formed). Therefore, the lower end of the first scribe line L22 of the side portion 14 is located on the outline of the side opening 29A at the lower right corner of the second portion 14b (on the hypotenuse of a right triangle), and when the joint portion is formed, it is located on the outline of the side opening 29A at the lower end of the second portion 15b (on the hypotenuse of a right triangle). Note that the second portion 15b has a first scribe line L22 that overlaps with the first scribe line L22 of the side portion 14 when the joint portion is formed. The first scribe line L21 of the side portion 14 extends downward to the right from a position between both ends of the right-hand inclined edge 27b of the notched portion 27 of the side portion 14 (for example, a position below the intermediate position) toward the lower right corner of the third portion 14c (a virtual intersection point P2 between the boundary scribe line L1 and the scribe line L7 when the joint portion is formed). Therefore, the lower end of the first scribe line L21 of the side portion 14 is located on the outline of the side opening 29B at the lower right corner of the third portion 14c (on the hypotenuse of a right triangle), and when the joint portion is formed, it is located on the outline of the side opening 29B at the lower end of the third portion 15c (on the hypotenuse of a right triangle). Note that the third portion 15c has a first scribe line L21 that overlaps with the first scribe line L21 of the side portion 14 when the joint portion is formed. In the side section 14, the first ruled line L21 and the first ruled line L24 are paired and are arranged symmetrically on the side section 14. The first ruled line L21 and the first ruled line L24 are arranged in a V-shape. Furthermore, in the side section 14, the first ruled line L22 and the first ruled line L23 form a pair and are arranged symmetrically on the side section 14. The first ruled line L22 and the first ruled line L23 are arranged in a V-shape. In the side section 14, the first ruled line L21 and the first ruled line L24 are positioned on the outside, with the first ruled line L22 and the first ruled line L23 in between.

[0045] The first lines L21, L22, L23, and L24 function as fold lines for folding the side portions 12 and 14 inward when the box body 100 is transformed into the second form 100b. Of these, the first crease lines L21 and L24 also function as fold lines for folding the side portion 12 (third portion 12c) and the side portion 14 (third portion 14c) when the box body 100 is in the first form 100a. Here, when folding the third portion 12c of the side portion 12 when the box body 100 is in the first form 100a, the third portion 12c is folded along the first crease line L21, causing the two portions of the third portion 12c with the first crease line L21 as the boundary to be folded 180° from each other so that their outer surfaces are close together or in surface contact. Similarly, the third portion 12c is folded along the first crease line L24, causing the two portions of the third portion 12c with the first crease line L24 as the boundary to be folded 180° from each other so that their outer surfaces are close together or in surface contact. Similarly, when folding the third portion 14c of the side portion 14 of the box body 100 in the first form 100a, the third portion 14c is valley-folded along the first crease L21, causing the two portions of the third portion 14c with the first crease L21 as the boundary to be folded 180° from each other so that their outer surfaces are close together or in surface contact. The third portion 14c is valley-folded along the first crease L24, causing the two portions of the third portion 14c with the first crease L24 as the boundary to be folded 180° from each other so that their outer surfaces are close together or in surface contact.

[0046] Here, the inclination angles of the first grid lines L21 and L24 are gentler than those of the first grid lines L22 and L23. The inclination angle of the first grid line L21 and the first grid line L24 is set to approximately 45°, for example.

[0047] When the box body 100 is assembled and the side sections 12 and 14 are facing each other, when viewed in the direction of opposition, that is, when viewed from the front as shown in Figure 9, the first scribe line L21 of the side section 12 and the first scribe line L21 of the side section 14 overlap (contend with each other), the first scribe line L22 of the side section 12 and the first scribe line L22 of the side section 14 overlap (contend with each other), the first scribe line L23 of the side section 12 and the first scribe line L23 of the side section 14 overlap (contend with each other), and the first scribe line L24 of the side section 12 and the first scribe line L24 of the side section 14 overlap (contend with each other).

[0048] At the center of the lower edge of the insertion piece 22 (located in the same position as the ruled line L10 in the vertical direction), an insertion slit 25 is formed, extending horizontally through both the front and back of the blank sheet 200, into which the insertion portion 23b of the insertion piece 23 (described later) is inserted. The width of the insertion slit 25 is set to be slightly larger than the width of the insertion portion 23b. At the upper end of the fourth section 13d, an opening 26 is formed that is cut out downwards in the portion facing the center in the lateral direction of the insertion slit 25. The width of the opening 26 is set to approximately the width of a human finger (for example, an index finger) to facilitate the operation of inserting the insertion part 23b into the insertion slit 25, and conversely, the operation of pulling out the insertion part 23b that is inserted into the insertion slit 25. Furthermore, its shape is, for example, semi-circular.

[0049] In the central part of the side portion 11 in the lateral direction, an insertion piece 23 is formed in the portion that spans the second portion 11b and the third portion 11c. The lower edge of the insertion piece 23 is located above the lower edge of the second portion 11b and below the upper edge of the second portion 11b, and extends horizontally. A horizontally extending grid line L11 is formed on the lower edge of the insertion piece 23. In the insert piece 23, a horizontally extending line L12 is formed in the portion that is at the same height as the line L7 in the vertical direction. The insertion piece 23 is formed, for example, in a rectangular shape, and is connected to the parts of the side portion 11 other than the insertion piece 23 only at the grid line L11, and is separated from the parts of the side portion 11 other than the insertion piece 23 by a slit formed along the outer shape of the insertion piece 23 (a slit that penetrates both the front and back of the blank sheet 200) outside of the grid line L11. As a result, the insertion piece 23 can pivot with respect to parts of the side portion 11 other than the insertion piece 23, using the score line L11 as the pivot axis, and can also bend along the score line L12. The insertion piece 23 has a base end portion 23a which is the part of the insertion piece 23 below the score line L12, and an insertion portion 23b which is the part of the insertion piece 23 above the score line L12. On both the left and right sides of the insertion piece 23, there are insertion slits 24 that extend horizontally at the same height as the grid line L7 in the vertical direction. The insertion slits 24 are for inserting the insertion piece 22 into the side portion 11, and the distance from the left end of the insertion slit 24 on the left side of the insertion piece 23 to the right end of the insertion slit 24 on the right side of the insertion piece 23 is set to be slightly larger than the width dimension of the insertion piece 22. Furthermore, the dimensions of the insertion piece 22 in the horizontal direction are larger than the dimensions of the insertion piece 23 in the horizontal direction.

[0050] In this way, grid lines (including the first grid line) are formed at the boundaries between each part of the blank sheet 200. Each ruled line is a straight groove formed on one side of the blank sheet 200 (for example, the side that will be the outer surface of the box 100) or on both sides (the side that will be the outer surface of the box 100 and the side that will be the inner surface of the box 100). The blank sheet 200 (and the box body 100) can be easily folded using the ruled lines as folding lines. Furthermore, the ruled lines may include not only grooves but also perforations. For example, the first crease lines L21, L22, L23, and L24, which extend diagonally with respect to the grain direction 201, have not only grooves but also perforations. This improves the foldability of the blank sheet 200 (box body 100) along the first crease lines L21, L22, L23, and L24. In particular, for the first crease lines L21 and L24, which are folded 180° as described above when forming the first form 100a, the length of the slit portion in the perforation is longer than that of the first crease lines L22 and L23. As a result, the foldability of the blank sheet 200 (box body 100) at the first crease lines L21 and L24 is further improved.

[0051] A strip-shaped fragment 19 is formed at the lower part of the blank sheet 200, traversing the blank sheet 200 in the lateral direction. More specifically, the fragment 19 extends horizontally across the entire width of the blank sheet 200, spanning the lower parts of the first section 15a, the first section 11a, the first section 12a, the first section 13a, and the first section 14a. Fracture guide lines 19a, such as perforations, are formed along the upper and lower edges of each of the fractured fragments 19. In the middle portion between the two ends of the broken fragment 19 (for example, the central portion in the lateral direction of the first portion 13a), a gripping portion 19b (for example, a pair of gripping portions 19b) is formed to make it easier for the user to grasp the broken fragment 19 when using it to break the blank sheet 200. A slit is formed at the upper and lower edges of each gripping portion 19b, and at the boundary between a pair of gripping portions 19b, extending from the upper edge to the lower edge of the gripping portion 19b, penetrating the blank sheet 200 from front to back.

[0052] In this embodiment, the width dimensions of each side portion 11, 12, 13, and 14 are equal to each other, and in the assembled state of the box body 100 (in either the first form 100a or the second form 100b described later), the plan view shape of the box body 100 is square. However, the planar shape of the assembled box 100 is not limited to this example; it may be a rectangle or any other polygon.

[0053] Blank sheet 200 is constructed as described above.

[0054] The box body 100 is transformable into a first form 100a (Figure 4, etc.) having a horizontal first top surface 52 (Figure 4, etc.) formed by the upper part of at least one side surface (any of side surfaces 11, 12, 13, 14), and a second form 100b (Figure 13, etc.) having a gable roof-shaped second top surface 62 (Figure 13, etc.) formed by the upper part of at least one side surface (any of side surfaces 11, 12, 13, 14).

[0055] Below, an example of the procedure for assembling the box body 100 into the first form 100a using the blank sheet 200, and the structure of the first form 100a, will be explained using Figures 2 to 7. The first embodiment 100a has a rectangular parallelepiped shape in which the bottom surface 51 and the first top surface 52 are both flat and horizontal.

[0056] First, the first planned joining portion 15 and the second planned joining portion 16 are joined surface-to-surface to form a joint portion. This makes it possible to give the blank sheet 200 a square cylindrical shape in plan view.

[0057] Furthermore, one outer flap 17 and one inner flap 18 are partially joined to each other, and the other outer flap 17 and the other inner flap 18 are also partially joined to each other. More specifically, the outer flap 17 (one of the outer flaps 17) connected to the first part 11a is joined to a portion of the inner flap 18 (one of the inner flaps 18) connected to the first part 12a, at a point lower and to the right of the score line L13. The portion of the inner flap 18 to which the outer flap 17 is joined is the portion that overlaps with the portion of the outer flap 17 lower and to the right of the score line L13 when the blank sheet 200 is made into a rectangular tube with a square shape in plan view, and the outer flap 17 and inner flap 18 are folded 90° at each score line L5 (see Figure 3). The outer flap 17 overlaps the inner flap 18 on the outside (the bottom side when the box body 100 is assembled). Therefore, a portion of the inner surface of the outer flap 17 is joined to a portion of the outer surface of the inner flap 18. As a result, one outer flap 17 and one inner flap 18 can pivot relative to the first part 11a and the first part 12a with their respective score lines L5 as pivot axes. In addition, the combined outer flap 17 and inner flap 18 can pivot from a valley-folded state to a flat state and from a flat state to a valley-folded state with the score line L13 as a pivot axis. Similarly, for the outer flap 17 connected to the first part 13a (the other outer flap 17), the portion to the lower right of the ruled line L13 is surface-joined to a portion of the inner flap 18 connected to the first part 14a (the other inner flap 18). As a result, not only are the other outer flap 17 and the other inner flap 18 able to pivot relative to the first part 13a and the first part 14a with their respective score lines L5 as pivot axes, but the other outer flap 17 and the other inner flap 18, when integrated, can also pivot with the score line L13 as their pivot axis. Then, as shown in Figure 3, each outer flap 17 and each inner flap 18 are folded 90° along their respective grid lines L5, so that each outer flap 17 and each inner flap 18 are positioned on substantially the same plane, thereby forming the bottom surface 51 of the first form 100a. The bottom portion 51 is a flat portion that closes the lower end of the box body 100 of the first embodiment 100a.

[0058] Next, the first top surface portion 52 (see Figures 4, 5, 6, and 7) is formed. To achieve this, while keeping the first parts 11a, 12a, 13a, 14a and the second parts 11b, 12b, 13b, 14b of each side section 11, 12, 13, 14 vertical, each side section 11, 12, 13, 14 is folded 90° in a mountain fold along the ruled line L7 (that is, the third parts 11c, 12c, 13c, 14c, which are the parts above the ruled line L7 of each side section 11, 12, 13, 14 are folded 90° in a mountain fold relative to the part below the ruled line L7), and the third parts 12c and 14c are folded 180° along each first ruled line L21 and each first ruled line L24 as described above, so that the third parts 12c and 14c are folded flat and horizontally. Furthermore, by inserting the insertion piece 22 into the insertion slit 24 and the insertion part 23b into the insertion slit 25, the side parts 11 and 13 are locked together. When the insertion piece 22 is inserted into the insertion slit 24, the insertion piece 22 is bent at 90° relative to the fourth portion 13d along the score line L10. When the insertion portion 23b is inserted into the insertion slit 25, the insertion portion 23b is bent at 90° relative to the base end portion 23a along the score line L12. During the process of inserting the insertion portion 23b into the insertion slit 25, the insertion piece 23, including the base end portion 23a, swings relative to the second portion 11b with the score line L11 as the pivot axis, but when the insertion portion 23b is inserted into the insertion slit 25, the base end portion 23a returns to a state where it is positioned substantially in the same plane as the second portion 11b. Furthermore, at this time, both ends of the insertion piece 21 in the width direction are inserted between the third portion 13c of the side portion 13 and the third portion 12c of the side portion 12 that are outside the first line L24 (the portion to the right of the first line L24 in Figure 1 in the third portion 12c), and between the third portion 13c of the side portion 13 and the third portion 14c of the side portion 14 that are outside the first line L24 (the portion to the left of the first line L24 in Figure 1 in the third portion 14c). In other words, one end of the insertion piece 21 in the width direction (the right end in Figure 1) (shown as one end 21b in Figure 7, and conveniently hatched) is inserted between the third portion 13c and the portion of the third portion 12c that are outside the first line L24. Furthermore, the other end of the insertion piece 21 in the lateral direction (the left end in Figure 1) (shown as the other end 21c in Figure 7, and conveniently hatched) is inserted between the third part 13c and the part of the third part 14c that is outside the first ruled line L24.

[0059] Here, by folding the third part 12c flat and horizontally, the portion of the third part 12c to the left of the first line L21 in Figure 1 overlaps the portion of the third part 12c between the first line L21 and the first line L23, so that these portions are close to each other and facing each other, or are in surface contact with each other. Furthermore, by folding the third part 12c flat and horizontally, the portion of the third part 12c to the right of the first grid line L24 in Figure 1 overlaps the portion of the third part 12c between the first grid line L24 and the first grid line L22, so that these portions are close to each other and facing each other, or are in surface contact with each other. In other words, by folding the portion of the third part 12c to the left of the first line L21 in Figure 1 180° in a valley fold relative to the portion between the first line L21 and the first line L24 in the third part 12c, and by folding the portion of the third part 12c to the right of the first line L24 in Figure 1 180° in a valley fold relative to the portion between the first line L21 and the first line L24 in the third part 12c, the third part 12c is folded flat and horizontally. That is, in the folded state of the third part 12c, the portion of the third part 12c to the left of the first line L21 in Figure 1, the portion of the third part 12c to the right of the first line L24 in Figure 1, and the space between the first line L21 and the first line L24 in the third part 12c are all horizontal. However, in the third section 12c, the upper edge of the portion to the left of the first grid line L21 in Figure 1 (the upper right corner of the third section 11c in Figure 1) (shown as corner 12d in Figure 7) and the upper edge of the portion to the right of the first grid line L24 in Figure 1 in the third section 12c (the upper left corner of the third section 13c in Figure 1) (shown as corner 12e in Figure 7) are close to each other but do not overlap. This makes it possible to form the first top surface 52 while suppressing excessive overlap of the sheet material.

[0060] Similarly, by folding the third portion 14c flat and horizontally, the portion of the third portion 14c to the right of the first line L21 in Figure 1 overlaps the portion of the third portion 14c between the first line L21 and the first line L23, so that these portions are close to each other, facing each other, or in surface contact with each other. Furthermore, by folding the third portion 14c flat and horizontally, the portion of the third portion 14c to the left of the first line L24 in Figure 1 overlaps the portion of the third portion 14c between the first line L24 and the first line L22, so that these portions are close to each other and facing each other, or are in surface contact with each other. In other words, by folding the portion of the third part 14c to the right of the first line L21 in Figure 1 180° in a valley fold relative to the portion between the first line L21 and the first line L24 in the third part 14c, and by folding the portion of the third part 14c to the left of the first line L24 in Figure 1 180° in a valley fold relative to the portion between the first line L21 and the first line L24 in the third part 14c, the third part 14c is folded flat and horizontally. That is, in the folded state of the third part 14c, the portion of the third part 14c to the left of the first line L24 in Figure 1, the portion of the third part 14c to the right of the first line L21 in Figure 1, and the space between the first line L21 and the first line L24 in the third part 14c are all horizontal. However, in the third section 14c, the upper edge of the portion to the right of the first line L21 in Figure 1 (located near the upper left corner of the third section 11c in Figure 1) (shown as corner 14d in Figure 7) and the upper edge of the portion to the left of the first line L24 in Figure 1 in the third section 14c (the upper right corner of the third section 13c in Figure 1) (shown as corner 14e in Figure 7) are close to each other but do not overlap. This makes it possible to form the first top surface 52 while suppressing excessive overlap of the sheet material.

[0061] Furthermore, by folding the side portion 11 by 90° along the ruled line L7, the third portion 11c and the insert piece 21 overlap a portion of the third portion 12c and a portion of the third portion 14c. In this case, the vertical dimensions of the third portion 11c and the insertion piece 21 (the vertical dimensions in Figures 1 and 2) are set such that the tip edge 21a of the insertion piece 21 (see Figures 1, 2, and 7) of the insertion piece 21 does not interfere with the inclined edge 27b on the side furthest from the side portion 11 (the side closer to the side portion 13), even without folding the insertion piece 21 at the ruled line L8, allowing the side portion 11 to be folded 90°. Here, the inclined edge 27b on the side furthest from the side portion 11 (closer to the side portion 13) refers to the right-hand inclined edge 27b in Figure 1 of the two inclined edges 27b in the third portion 12c, and the left-hand inclined edge 27b in Figure 1 of the two inclined edges 27b in the third portion 14c. In Figure 7, the inclined edge 27b on the side furthest from the side portion 11 (the side closer to the side portion 13) is shown by a thick dotted line.

[0062] As described above, one end of the insertion piece 21 in the lateral direction (the right end in Figure 1) is inserted between the portions of the third part 13c and the third part 12c that are outside the first grid line L24, and the other end of the insertion piece 21 in the lateral direction (the left end in Figure 1) is inserted between the portions of the third part 13c and the third part 14c that are outside the first grid line L24. Therefore, both ends of the insertion piece 21 are held between the third part 13c and the third part 12c, and between the third part 13c and the third part 14c, respectively. Thus, in the state in which the first top surface portion 52 is formed, the insertion piece 21 is stably held between the third part 13c and the third part 12c, and between the third part 13c and the third part 14c. Therefore, the structural stability of the box body 100 when assembled into the first form 100a can be sufficiently ensured (flapping and wobbling of the insert piece 21 can be suppressed). Furthermore, in the vertical direction, the part of the third section 12c that is outside the first scribe line L21 (left side in Figure 1) and the part of the third section 12c that is outside the first scribe line L24 (right side in Figure 1) can be arranged on the same level, and the part of the fourth section 14c that is outside the first scribe line L21 (right side in Figure 1) and the part of the third section 14c that is outside the first scribe line L24 (left side in Figure 1) can be arranged on the same level. Thus, the aesthetic appearance of the box body 100 when assembled into the first form 100a is further improved. However, the ends of the insertion piece 21 do not necessarily have to be inserted between the third part 13c and the third part 12c, and between the third part 13c and the third part 14c. That is, by folding the third part 12c and the third part 14c by 180° along the first ruled line L24, a portion of the third part 12c may overlap one end of the insertion piece 21 in the width direction (the right end in Figure 1) (shown as one end 21b in Figure 7, and conveniently hatched). Similarly, a portion of the third part 14c may overlap the other end of the insertion piece 21 in the width direction (the left end in Figure 1) (shown as the other end 21c in Figure 7, and conveniently hatched). In this case, the portion of the third part 12c that overlaps one end of the insert piece 21 is a part of the portion of the third part 12c that is to the right of the first grid line L24 in Figure 1, and is also a portion near the upper end of the right-side inclined edge 27b in Figure 1. Similarly, the portion of the third part 14c that overlaps the other end of the insert piece 21 is a part of the portion of the third part 14c that is to the left of the first grid line L24 in Figure 1, and is also a portion near the upper end of the left-side inclined edge 27b in Figure 1.

[0063] Furthermore, by folding the side portion 13 at a 90° angle along the ruled line L7, the uppermost portion of the first top portion 52 is formed by the third portion 13c and the fourth portion 13d of the side portion 13. In other words, the third portion 13c and the fourth portion 13d cover the folded third portion 12c and third portion 14c from above, and also cover the third portion 11c and the insert piece 21 from above. At this time, the side portion 13 does not fold at the ruled line L9, and the third portion 13c and the fourth portion 13d are located on the same plane as each other.

[0064] Here, the sum of the vertical dimensions of the third section 13c (vertical dimensions in Figures 1 and 2) and the vertical dimensions of the fourth section 13d (vertical dimensions in Figures 1 and 2) is equal to the horizontal dimensions of the side sections 12 and 14. This allows the third section 13c and the fourth section 13d to cover the entire upper surface of the second embodiment 100b.

[0065] Thus, the box-shaped body 100 of the first form 100a is completed. The first top surface portion 52 of the first embodiment 100a is formed by the upper part of the side portion 11 (third portion 11c and insertion piece 21), the upper part of the side portion 12 (third portion 12c), the upper part of the side portion 13 (third portion 13c and fourth portion 13d), the upper part of the side portion 14 (third portion 14c), and the insertion portion 23b. In the box body 100 of the first embodiment 100a, the side portion 11 (first portion 11a and second portion 11b) and the side portion 13 (first portion 13a and second portion 13b) are parallel to each other, and the side portion 12 (first portion 12a and second portion 12b) and the side portion 14 (first portion 14a and second portion 14b) are parallel to each other. Furthermore, the side portions 12 and 14 are perpendicular to the side portions 11 and 13, respectively. The contents to be stored in the box 100 of the first form 100a are not particularly limited. For example, multiple containers 300, such as PET bottle containers, can be stored vertically (for example, four).

[0066] Next, an example of the procedure for transforming the box body 100 from the first form 100a to the second form 100b, and the structure of the second form 100b, will be explained using Figures 8 to 18.

[0067] For example, first, the broken fragments 19 are broken and removed from the box body 100 of the first form 100a along the upper and lower fracture guide lines 19a, and the parts of the box body 100 below the broken fragments 19 are also removed. Therefore, the lower end of the box body 100 in the second form 100b is completely open (a bottom opening 61 is formed as shown in Figures 16 and 17). Furthermore, the insertion part 23b is temporarily removed from the insertion slit 25, and the insertion piece 22 is removed from the insertion slit 24 to release the lock between the side part 11 and the side part 13. Figures 8 and 9 show the state in which the entirety of each side section 11, 12, 13, and 14 is raised vertically to form a rectangular cylindrical box body 100.

[0068] To assemble the box body 100 into the second form 100b, as shown in Figure 10, while keeping the first parts 11a, 12a, 13a, and 14a of each side section 11, 12, 13, and 14 vertical, fold each side section 11, 12, 13, and 14 along the scribe line L6, and fold side sections 12 and 14 along the first scribe lines L21, L22, L23, and L24, respectively. That is, the first side sections, side sections 12 and 14, are folded inward in a convex shape.

[0069] Figure 11 shows the completed state after folding of each side portion 11, 12, 13, and 14 along the ruled line L6, and the completed folding of side portions 12 and 14 along each of the first ruled lines L21, L22, L23, and L24. In this embodiment, the folding angles of each side portion 11, 12, 13, and 14 in the ruled line L6 are angles smaller than 90°, for example, about 45°.

[0070] In the side portion 12 (in the second portion 12b and the third portion 12c), the portion between the first scribe line L22 and the first scribe line L23 is inclined inward while remaining flat overall. Similarly, in the side portion 14 (in the second portion 14b and the third portion 14c), the portion between the first line L22 and the first line L23 is inclined inward while remaining flat overall. In the side portions 12 and 14, the portion between the first grid line L22 and the first grid line L23 is the first inwardly inclined portion 30.

[0071] In the side portion 12 (in the second portion 12b and the third portion 12c), the portion between the first scribe line L21 and the first scribe line L24 is inclined inward. However, the portion between the first scribe line L21 and the first scribe line L24 is also bent at the first scribe line L22 and the first scribe line L23 (located between the first scribe line L21 and the first scribe line L24), so the entire portion is not flat. Similarly, in the side portion 14 (in the second portion 14b and the third portion 14c), the portion between the first line L21 and the first line L24 is inclined inward. In the side portions 12 and 14, the portion between the first grid line L21 and the first grid line L24 includes a first inward inclined portion 30 which is the portion between the first grid line L22 and the first grid line L23, a second inward inclined portion 31 which is the portion between the first grid line L21 and the first grid line L22, and a second inward inclined portion 31 which is the portion between the first grid line L24 and the first grid line L23.

[0072] In the side portion 12 (in the third portion 12c), the parts outside the first ruled line L21 and the first ruled line L24 (the parts on both sides) are arranged along the inner surface of the third portion 11c and the inner surface of the third portion 13c, respectively. Similarly, in the side portion 14 (in the third portion 14c), the portions outside the first ruled line L21 and the first ruled line L24 (the portions on both sides) are arranged along the inner surfaces of the third portion 11c and the third portion 13c, respectively.

[0073] In the state shown in Figure 11, the insertion piece 21 of the side portion 11, which is folded along the ruled line L8 (see Figures 1 and 10, etc.), is inserted between the inner surface of the third portion 13c of the side portion 13 and the portion of the third portion 12c that is positioned along the inner surface of the third portion 13c, and also between the inner surface of the third portion 13c of the side portion 13 and the portion of the third portion 14c that is positioned along the inner surface of the third portion 13c. In the state shown in Figure 11, the upper edge of the third part 11c and the upper edge of the third part 13c are close to each other (they substantially coincide).

[0074] In the state shown in Figure 11, the side portion 11 is folded along the line L6 and also along the line L7. That is, the inclination angle of the third portion 11c is gentler than that of the second portion 11b. Similarly, the side portion 13 is folded along the ruled line L6 and also along the ruled line L7. That is, the inclination angle of the third portion 13c is gentler than that of the second portion 13b.

[0075] After the state shown in Figure 11, the side portion 13 is folded along the ruled line L9, as shown in Figure 12, and the fourth portion 13d is placed on top of the third portion 11c. Here, the vertical dimensions of the fourth part 13d (the vertical dimensions in Figures 1 and 2) and the vertical dimensions of the third part 11c (the vertical dimensions in Figures 1 and 2) are equal to each other. Therefore, the fourth part 13d can be made to fit snugly over the third part 11c. Furthermore, by inserting the insertion piece 22 into the insertion slit 24 and the insertion part 23b into the insertion slit 25, the side parts 11 and 13 are locked together. Thus, the box-shaped body 100 of the second form 100b (Figures 12 and 13) is completed. The second top surface portion 62 of the second embodiment 100b is formed by the upper part of the side portion 11 (second portion 11b, third portion 11c, insertion piece 21 and insertion piece 23), the upper part of the side portion 12 (second portion 12b and third portion 12c), the upper part of the side portion 13 (second portion 13b, third portion 13c, fourth portion 13d and insertion piece 22), and the upper part of the side portion 14 (second portion 14b and third portion 14c).

[0076] Thus, the opposing side portions (side portion 11 and side portion 13) have a locking structure (for example, composed of an insertion piece 23 including an insertion portion 23b, an insertion slit 24, an insertion piece 22 and an insertion slit 25, etc.) that locks them together in at least the second form 100b. Therefore, the box body 100 can be maintained in the second form 100b more stably. Furthermore, this locking structure also locks together in the first form. Therefore, the box body 100 can be more stably maintained in the first form 100a, and the common locking structure can be used for both morphological stability in the second form 100b and morphological stability in the first form 100a.

[0077] As shown in Figures 12 and 13, the second form 100b is shaped like a house with a gable roof (second top surface 62). The lower end position of the second top surface 62 (position of ruled line L6) is lower than that of the first top surface 52 (position of ruled line L7), and the first side surface (side surface 12, 14) has a horizontally extending ruled line (ruled line L6) positioned at the lower end position of the second top surface 62.

[0078] The portion of the side section 13 that is bent at the line L9 extends horizontally at the top of the second top section 62 of the second form 100b, resembling the ridge (top of the roof) of a house. Here, the vertical dimension of the third section 13c (the vertical dimension in Figures 1 and 2) and the vertical dimension of the fourth section 13d (the vertical dimension in Figures 1 and 2) are equal to each other. For this reason, the second top surface section 62 is symmetrical with respect to the ridge section. As the above-described notched portions 27 are formed on the upper edges of the side portions 12 and 14, as shown in Figure 12, openings 63 that open to the side are formed at the upper ends (the parts covered by the roof) of the side portions 12 and 14.

[0079] The box body 100 of the second form 100b can be used as a lantern in combination with a container 300 and a lighting device 400 (for example, a smartphone equipped with a light-emitting function), as shown in Figures 14 and 15. The lighting device 400 may be a flashlight or the like. The container 300 is not particularly limited as long as it is translucent, but examples include PET bottles for beverages and the like. For example, by placing a lighting device 400 with its light emission direction directed upward beneath the container 300, the light is scattered as it passes through the container 300, allowing the light to be directed out of the container 300 in various directions. The container 300 may or may not contain any contents, but when it contains contents, the light can be scattered more evenly within the container 300 (allowing a gentler light to be emitted around the container 300). In particular, if the container contains colored contents such as tea, the color of the emitted light can be changed as the light passes through the contents. The container 300 has a main body portion 301, a cap portion 302, and a neck portion 303 which is the boundary portion between the cap portion 302 and the main body portion 301.

[0080] In disaster shelters, it is expected that the interiors will be dimly lit even during the daytime, but humans instinctively feel fear and anxiety in the face of darkness. On the other hand, the way light is used can cause stress. For example, high brightness lighting or light shining directly into a person's eyes can easily cause stress. In response to these circumstances, this embodiment makes it possible to easily create a lantern that gently illuminates its surroundings. In particular, since the box body 100 can be transformed from the first form 100a to the second form 100b, after it has finished functioning as the first form 100a, it can be transformed into the second form 100b for suitable after-sales use.

[0081] Furthermore, the enclosure 100 does not necessarily have to be intended for after-sales use, and may be intended solely for use in the second form 100b described above. In this case, the box body 100 is unnecessary because of the fragments 19 and the part below the fragments 19. Figure 18 shows the blank sheet 200 in this case.

[0082] As described above, the first side surface has a notched portion 27 that is carved out downward from each of its upper edges. Therefore, when each first side portion is bent inward in a convex shape along the first grid lines L21, L22, L23, and L24, an opening is formed between the notched portion 27 of the first side portion and the side portion that is facing the first side portion in the horizontal direction. In other words, in this embodiment, an opening is formed between the notched portion 27 of the side portion 12 and the side portion 14 that is facing the side portion 12. At the same time, an opening is formed between the notched portion 27 of the side portion 14 and the side portion 12 that is facing the side portion 14. More specifically, an opening is formed between the notched portion 27 of the side portion 12 and the notched portion 27 of the side portion 14. Therefore, the container 300, which is the object to be locked, can be locked into that opening. Furthermore, the deeper the notched portion 27, the wider the opening becomes, allowing for the securing of larger objects. In other words, the depth of the notched portion 27 can be set according to the desired dimensions of the object to be secured.

[0083] In this embodiment, the first side portions, side portion 12 and side portion 14, each have a notched shape 27 formed therein. The side portions 12 and 14 face each other. Therefore, an opening is formed between the notched portion 27 of the side portion 12 and the notched portion 27 of the side portion 14. For example, as shown in Figure 15, by making the initial dimensions of the opening smaller than the outer diameter of the neck portion 303, the neck portion 303 can be fitted into the opening while the opening is elastically deformed, thereby locking the object to be locked into the opening. If the neck portion 303 of the container 300 is constricted, locking the object to be locked becomes even easier. For example, as shown in Figures 14 and 15, the box body 100 of the second form 100b can be suspended from the container 300 by clamping the neck portion 303 with the lower edges 27a of the two notched portions 27. However, the present invention is not limited to this example, and the object to be locked, such as the container 300, may also be suspended from inside the box body 100 of the second form 100b by the notched portions 27. Furthermore, an opening 63 is formed at the upper end of the first side portion (side portions 12 and 14) to connect the internal space and the external space of the box body 100. Therefore, as shown in Figures 14 and 15, when the box body 100 is formed in the shape of a house with a sloping roof, and a container 300 that transmits and scatters light from the lighting device 400 is selected as the object to be locked, the light can be guided from the inside to the outside of the box body 100 through the opening 63 formed by the presence of the notched portion 27.

[0084] The container 300 may be the contents that were originally contained within the box body 100 of the first form 100a. In this case, in the box body 100 of the second form 100b, if the distance (height difference) from the lower edge 27a to the lowest end (bottom opening 61) of the box body 100 is smaller than the height difference from the neck portion 303 of the container 300 to the lowest end (bottom surface), then, as shown in Figure 14, the lower end of the container 300 can protrude downward from the bottom opening 61 of the box body 100, so that the lower edge 27a can be locked to the neck portion 303 of the container 300 and the box body 100 can be suspended from the container 300.

[0085] In this embodiment, the lower edge 27a of the notched portion 27 extends horizontally. Therefore, any point along the longitudinal direction of the lower edge 27a can be engaged with the object to be engaged, thus relaxing the constraints on the positional accuracy of the object to be engaged with the box body 100. Furthermore, when the object to be engaged is fitted to the lower edge 27a such that the portion of the lower edge 27a of the notched portion 27 that is in contact with the object to be engaged undergoes elastic deformation, the object to be engaged can be stably engaged with a stronger engagement force.

[0086] Furthermore, the side openings 28, 29A, and 29B of each side section 11, 12, 13, and 14 (especially side opening 28) are designed to resemble windows of a house. Light scattered by the container 300 can be guided out to the outside of the box 100 through the side openings 28, 29A, and 29B. Each side section has a variety of side openings 28, with different opening areas (the opening area of ​​each individual side opening 28, or the total opening area of ​​multiple side openings 28) and different shapes of the side openings 28. Therefore, the method of light emission can be varied for each side section, allowing the user to adjust the amount of light emitted by selecting the side section facing them according to their preference.

[0087] Furthermore, the box body 100 (and the blank sheet 200) has horizontal lines (lines L6) that extend horizontally at the height of the intersection P1. When the first side sections (side sections 12, 14) are folded along the first ruled line, the folding in the first side sections is concentrated along the horizontal ruled line (ruled line L6) and the first ruled line. As a result, the horizontal ruled line (ruled line L6) becomes a mountain fold and the first ruled line becomes a valley fold, making it easy to tilt the upper part of the first side section (first inward inclined section 30 and second inward inclined section 31) inward.

[0088] As described above, the side portions 12 and 14 have a pair of first lines forming a V-shape. That is, each first side portion has at least one pair of first lines that move upward and approach each other. This makes it easy to bend the first side portion inward into a convex shape with little force, and also allows other side portions (side portion 11 and side portion 13) that are connected to the first side portion to be tilted in conjunction with the first side portion. As a result, it becomes possible to tilt the second top portion 62 into a shape such as a gable roof.

[0089] More specifically, one first side surface has at least a pair of first lines that move upward toward each other, and the portion of the first side surface between the pair of first lines is an inclined portion (first inclined portion 30, second inclined portion 31) that inclines inward when the first side surface is bent inward in a convex shape along the first lines. Furthermore, at least one of the side openings 28, 29A, and 29B is an upward-facing opening located in an inwardly inclined portion (first inwardly inclined portion 30, second inwardly inclined portion 31), and when the first side portion is bent inward convexly along the first scribe line, at least one of the portions on either side of the inwardly inclined portion (first inwardly inclined portion 30, second inwardly inclined portion 31) in the first side portion covers the upper part of the upward-facing opening. In other words, the side openings 28 and 29A formed in the second portion 12b of the side portion 12, and the side openings 28 and 29A formed in the second portion 14b of the side portion 14, are covered from above by a portion of the second top surface portion 62 in the second embodiment 100b (see Figures 15 and 16). In Figures 15 and 16, the side openings 29A formed in the second portion 12b and the second portion 14b are marked with dot-shaped hatching to make their extents clearer. Similarly, the side opening 29B formed in the third portion 12c of the side portion 12 and the side opening 29B formed in the third portion 14c of the side portion 14 are covered from above by a portion of the second top portion 62 in the second embodiment 100b. In particular, the side openings 29A, or at least a portion thereof, are upward-facing openings that are covered from above by the portions on either side of the inwardly inclined portions (first inwardly inclined portions 30) in the side portions 12 and 14. Similarly, the side openings 29B, or at least a portion thereof, are upward-facing openings that are covered from above by the portions on either side of the inwardly inclined portions (second inwardly inclined portions 31) in the side portions 12 and 14. Therefore, the light guided upward from the upward-facing opening strikes the sides of the inward-sloping sections (first inward-sloping section 30, second inward-sloping section 31) and is reflected before being used as indirect light reaching the user. In other words, it is possible to achieve indirect lighting that makes not only the windows of the house but also the exterior walls appear to be softly illuminated.

[0090] In this embodiment, as shown in Figure 9, dimension D2 is longer than dimension D1. That is, of the opening area of ​​the side openings 29A formed in the second portion 12b and the second portion 14b, the proportion of the area that can guide light upward and illuminate the sides of the inwardly inclined portion (first inwardly inclined portion 30) is the majority of the side opening 29. Therefore, it is possible to increase the proportion of light that can be used as indirect light reaching the user after it hits and is reflected off the sides of the inclined portion (first inclined portion 30) of the light emanating from the side opening 29A.

[0091] More specifically, two pairs of first lines forming a V-shape are formed on the side portion 12 and the side portion 14, respectively. In other words, two pairs of first lines are formed on the first side surface, approaching each other upwards. Furthermore, the first lines L21 and L24 of the first pair are positioned on the outside, with the first lines L22 and L23 of the second pair in between, and the lower ends of the first lines L21 and L24 of the first pair are positioned above the lower ends of the first lines L22 and L23 of the second pair.

[0092] More specifically, the slope angles of the first lines L21 and L24 in the first pair are gentler than the slope angles of the first lines L22 and L23 in the second pair. As a result, as shown in Figure 12, it is possible to create a roof shape where the angle of inclination changes midway (with a gentler slope towards the top), making the roof shape rounded and giving a warm feeling.

[0093] As described above, the blank sheet 200 (sheet material) has boundary lines L1, L2, L3, and L4 formed on it that define the boundaries between adjacent side portions 11, 12, 13, and 14. In this embodiment, the sheet material is preferably paper, and its grain direction 201 is preferably horizontal. Here, folding the paper perpendicular to the grain (the direction of the paper's grain) allows for more precise folding along the crease lines. Conversely, when folding parallel to the grain, the paper folds easily, potentially creating creases in unintended positions that deviate from the crease lines. This deviation in folding accuracy significantly affects the alignment of the joints when they are glued together. When the sheet material is paper, the grain direction 201 is horizontal, which allows the paper material to be folded precisely along the boundary lines L1, L2, L3, and L4 that form the boundaries between adjacent side sections, making it possible to precisely shape the box body 100 into the desired form.

[0094] The embodiments have been described above with reference to the drawings, but these are merely examples of the present invention, and various other configurations can also be adopted.

[0095] For example, in the above description, an example was explained in which two pairs of first lines (two pairs of V-shaped first lines) are formed on one first side surface (side surface 12 or side surface 14), but it is also possible for only one pair of V-shaped first lines to be formed on one first side surface. Furthermore, the number of first lines formed on one of the first side surfaces is not limited to multiple lines, but may be just one. Furthermore, the direction of extension of the first grid line (the direction of extension of the first grid line when the side surface is standing vertically) is not limited to the direction of inclination, but may also be the vertical direction. Furthermore, the number of first side surfaces (side surfaces on which the first grid lines are formed) may be just one, or it may be three or more. Furthermore, the first side portion does not necessarily have to have a notched portion 27. Furthermore, although the above description explained an example in which the second top surface 62 is a sloped roof (gable roof), the second top surface 62 may also be a horizontal roof that is not sloped. Furthermore, although the above description explains an example in which the second top surface portion 62 of the second embodiment 100b is composed of the upper parts of four side portions (side portions 11, 12, 13 and side portion 14), the second top surface portion 62 only needs to be composed of the upper parts of one or more side portions. Furthermore, the box body 100 of the second form 100b does not necessarily have to have a second top surface portion 62. Furthermore, although the above describes an example in which the box body 100 has four side sections, the number of side sections of the box body 100 may be, for example, three. In this case, for example, instead of side section 11 being present, the vertical dimension of side section 13 is longer, and in the second embodiment 100b, the side section 11 forms the second top surface 62 and a pair of opposing side sections, and the insertion piece 22 is locked to the side section 11 itself. Alternatively, the box body 100 may be formed in a triangular shape in plan view, with side sections formed on each of the three sides of the triangular shape. Furthermore, the box body 100 may have, for example, two side sections. In this case, for example, side sections 11 and 13 may not exist, and only side sections 12 and 14 may be present, with flaps extending in opposite directions from a pair of inclined edges 27b, and the tips of these flaps may be locked together.

[0096] This embodiment encompasses the following technical concepts. (1) A box formed by folding a sheet material, Having two or more side sections, One or more of the aforementioned side surfaces, specifically the first side surface, have a first grid line formed on them that extends in the vertical direction. A box body in which the first side portion can be bent inward in a convex shape along the first scribed line. (2) The box body according to (1), wherein the first side surface has a notched shape formed thereon, which is carved out downward from the upper edge of the first side surface. (3) The box body as described in (2), wherein the lower edge of the notched portion extends horizontally. (4) The box body according to any one of (1) to (3) having a side opening formed in the side portion. (5) The first ruled line extends in the direction of inclination, The box body according to (4), wherein at least one of the side openings is an intersection opening that opens into a region including at least the intersection of the extensions of the first line and the boundary lines forming the boundary between adjacent side portions. (6) A pair of first lines are formed on one of the first side surfaces, approaching each other upwards. In the first side portion, the portion between the pair of first lines is an inclined portion that inclines inward when the first side portion is bent inward along the first lines in a convex shape. At least one of the side openings is an upward-facing opening located in the inwardly inclined portion, The box body according to (4) or (5), wherein when the first side portion is bent inward in a convex shape along the first scribe line, at least one of the portions on either side of the inwardly inclined portion of the first side portion covers the upper part of the upward opening. (7) Two pairs of first lines are formed on one of the first side surfaces, approaching each other upwards. Of these, each of the first pair of the aforementioned first lines is positioned on the outside, with the second pair of the aforementioned first lines in between, The box body according to any one of (1) to (6), wherein the lower end position of the first ruled line of the first pair is higher than the lower end position of the first ruled line of the second pair. (8) The box body as described in (7), wherein the angle of inclination of the first line of the first pair is gentler than the angle of inclination of the first line of the second pair. (9) The box body is A first embodiment having a horizontal first top surface formed by the upper part of at least one of the side surfaces, A second embodiment having a gable roof-shaped second top surface formed by the upper part of at least one of the aforementioned side surfaces, It is transformable into, The lower end position of the second top surface is lower than that of the first top surface. The box body according to any one of (1) to (8), wherein the first side surface has a horizontally extending horizontal line positioned at the lower end of the second top surface. (10) A blank sheet for a box body as described in any one of items (1) to (9), It has a first planned joining portion and a second planned joining portion that are joined to each other surface to form a joint portion, A blank sheet in which the first planned joining portion and the second planned joining portion are joined surface-to-surface, thereby forming the joint portion. [Explanation of Symbols]

[0097] 11, 12, 13, 14 Side part 11a, 12a, 13a, 14a Part 1 11b, 12b, 13b, 14b 2nd part 11c, 12c, 13c, 14c 3rd part 12d, 12e, 14d, 14e corner 13d 4th part 15. First planned joint section 15a Part 1 15b Part 2 15c Part 3 16. Second planned joint section 17 Outer flap 17a Notched section 18 Inner flap 19 Fragments 19a Breakage guide wire 19b Pinching part 21, 22, 23 Insertion piece 21a Tip edge 21b One end 21c Other end 23a Proximal part 23b Insertion part 24, 25 Insertion slits 26 Aperture 27 Notched section 27a lower edge 27b Inclined edge 28, 29A, 29B side opening 30 1st inward inclined part (inward inclined part) 31 2nd inward inclined part (inward inclined part) 51 Bottom part 52 1st top section 61 Bottom opening 62 Second top section 63 Aperture L1, L2, L3, L4 Boundary Lines L5, L6, L7, L8, L9, L10, L11, L12, L13 grid lines L21, L22, L23, L24 First gridline P1, P2 intersection 100 box body 100a First form 100b 2nd form 200 Blank Sheets (Sheet Material) 201 Paper grain direction 300 containers 301 Main body 302 Cap section 303 Neck 400 Lighting devices

Claims

1. A box-shaped body formed by folding a sheet material, Having two or more side sections, One or more of the aforementioned side surfaces, which are first side surfaces, have a first grid line formed on them that extends in the vertical direction. A box body in which the first side portion can be bent inward in a convex shape along the first score line.

2. The box body according to claim 1, wherein the first side surface has a notched shape formed therein, which is carved out downward from the upper edge of the first side surface.

3. The box body according to claim 2, wherein the lower edge of the notched portion extends horizontally.

4. The box body according to any one of claims 1 to 3, having a side opening formed in the side portion.

5. The first ruled line extends in the direction of inclination, The box body according to claim 4, wherein at least one of the side openings is an intersection opening that opens in a region including at least the intersection of the extensions of the first line and the boundary lines forming the boundary between adjacent side portions.

6. A pair of first lines are formed on the first side surface, approaching each other upwards. In the first side portion, the portion between the pair of first lines is an inclined portion that inclines inward when the first side portion is bent inward along the first lines in a convex shape. At least one of the side openings is an upward-facing opening located in the inwardly inclined portion, The box body according to claim 4, wherein when the first side portion is bent inward in a convex shape along the first scribe line, at least one of the portions on either side of the inwardly inclined portion of the first side portion covers the upper part of the upward opening.

7. Two pairs of first lines are formed on the first side surface of one, approaching each other upwards. Of these, each of the first pair of first lines is positioned on the outside, with the second pair of first lines in between, The box according to any one of claims 1 to 3, wherein the lower end position of the first line of the first pair is higher than the lower end position of the first line of the second pair.

8. The box body according to claim 7, wherein the angle of inclination of the first line of the first pair is gentler than the angle of inclination of the first line of the second pair.

9. The box in question is, A first embodiment having a horizontal first top surface formed by the upper part of at least one of the side surfaces, A second embodiment having a gable roof-like second top surface formed by the upper part of at least one of the side surfaces, It is transformable into, The lower end position of the second top surface is lower than that of the first top surface. The box body according to any one of claims 1 to 3, wherein the first side surface has a horizontally extending horizontal line positioned at the lower end of the second top surface.

10. A blank sheet for a box according to any one of claims 1 to 3, It has a first planned joining portion and a second planned joining portion that are joined to each other to form a joint portion, A blank sheet in which the first planned joining portion and the second planned joining portion are joined surface-to-surface, thereby forming the joint portion.

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