JP6284835B2 - Packaging box and unfolding body of packaging box - Google Patents

Description

  The present invention relates to a packaging box and a development body of the packaging box.

  The packaging box 201 shown in FIG. 5 is disclosed in Patent Document 1. The packaging box 201 includes a bottomed cylindrical box body 202 and a lid 203 that covers an opening above the box body 202.

  As shown in FIG. 5, the box body 202 includes a rectangular bottom plate 204 and four side plates 205 erected from the periphery of the bottom plate 204. The lid 203 includes a pair of folding plates 261 and a pair of rotating plates 262 that are continuously formed between the pair of folding plates 261. The pair of folding plates 261 are continuously formed on the upper edges a of the pair of side plates 205 arranged opposite to each other, and the pair of rotating plates 262 are formed continuously on the upper edges g of the remaining pair of side plates 205 arranged opposite to each other. Has been. The pair of rotating plates 262 are configured to be rotatable about the upper edges g of the pair of side plates 205 between a cover position that covers the opening and an exposed position that exposes the opening.

  Here, in the packaging box 201, one sheet is folded at a predetermined position as a crease, and a folded packaging box expansion body formed into a thin plate shape as a whole is folded up. It is configured.

  The pair of folding plates 261 are folded with the edge of the boundary between the folding plate 261 and the side plate 205 (the same position as the upper edge of the side plate 205, hereinafter sometimes referred to as the boundary edge a) as the bottom. As a pair of oblique lines c and d forming an isosceles right angled isosceles triangle with the middle point of the upper edge of the tatami plate 261 as the apex b, the triangle is surrounded by a base a and a pair of oblique lines c and d. A folding plate 263 configured, and a pair of overlapping plates 264 configured in a triangular shape surrounded by a pair of oblique folding lines c and d and side edges e of the folding plates 261 are provided. The folding plate 263 is formed to be folded into a valley fold with the boundary edge a as a fold, and into a mountain fold with a pair of oblique fold lines c and d as a fold, and is placed on the side plate 205. In addition, in a state where the folding plate 263 is overlaid on the outer surface of the side plate 205, the pair of overlapping plates 264 are arranged to overlap the surface of the folding plate 263 opposite to the side plate 205. The pair of rotating plates 262 are respectively connected to the pair of overlapping plates 264 between the pair of folding plates 261.

  In such a packaging box 201, when the cover 203 is rotated from the exposed position to the cover position, the folding plate 263 is folded with the boundary edge a as a fold, and is overlapped on the surface of the side plate 205. The overlapping plate 264 is folded with the pair of oblique fold lines c and d as folds and overlapped with the folding plate 263. At this time, the pair of rotating plates 262 are pulled by the folding plate 263 via the pair of overlapping plates 264 and reach the cover position. Thereafter, the top portion b formed by the pair of oblique lines c and d in the folding plate 263 is inserted and locked into a Y-shaped cut 265 formed in the side plate 205. Thus, the pair of rotating plates 262 (lid body 203) is held at the cover position.

  However, in the conventional packaging box 201, in order to hold the lid 203 at the cover position, it must be inserted and locked into the Y-shaped notch 265 formed in the side plate 205, which is troublesome. That is, the conventional packaging box 201 has poor assembly workability.

Japanese Utility Model Publication No. 56-175331

  The present invention has been made in view of the above background, and a packaging box capable of reliably holding the lid at the cover position in the assembled state while improving the assembling workability, and this It aims at providing the expansion body for producing a packaging box.

The above object is solved by the present invention described below.
That is, the present invention according to claim 1 includes a rectangular bottom wall and a peripheral wall erected from four edges of the bottom wall, the box body having an opening upward, and extending to the upper edge of the peripheral wall. A lid that is installed and covers the opening,
The peripheral wall includes a pair of first and third side walls facing each other, and a pair of second and fourth side walls facing each other.
The lid body is displaceably provided at an exposed position that exposes the opening, and a cover lid position that extends to the upper edge of each of the first and third side walls and is bent at the upper edge to cover the opening. A pair of cover walls, and a pair of holding pieces that extend to the upper edge of each of the second and fourth side walls and hold the pair of cover walls at the cover position,
Each of the pair of cover walls and each of the pair of holding pieces are each in a rectangular shape, and are provided continuously in an annular shape at the exposed position,
The dimension in the extending direction of the boundary edge between each cover wall and each holding piece extends from both ends of the second and fourth boundary portions corresponding to the boundary between each holding piece and each of the second and fourth side walls. It is formed to be approximately equal to the dimension up to the midpoint,
The boundary edge is overlaid on the second and fourth boundary portions in a state where the cover wall is located at the cover position, and the holding pieces are surfaces of the second and fourth side walls. Is superimposed on
Each of the cover walls has a pair of oblique sides inclined at substantially equal angles from both ends of the first and third boundary portions that contact the boundaries of the first and third sidewalls. Formed to the edge of the installation direction,
In the packaging box, each of the cover walls is formed in a mountain shape in which the pair of oblique sides become ridge lines in a state where the cover wall is located at the cover position.

  According to a second aspect of the present invention, in the present invention according to the first aspect, any one or both of the pair of cover walls are provided with a hand wall attached to an extending direction edge of the cover wall. It is characterized by having.

According to a third aspect of the present invention, there is provided a rectangular bottom wall and a peripheral wall erected from four edges of the bottom wall, the box body having an opening upward, and extended to the upper edge of the peripheral wall. And a lid covering the opening,
A pair of cover walls extending from the upper edges of the pair of opposed peripheral walls, and covering the opening at the cover position bent at the upper edges, and a pair of peripheral walls facing each other except the pair of peripheral walls A deployment body for producing a packaging box comprising a pair of holding pieces that extend to the upper edge of the pair of holding pieces and hold the pair of cover walls at the cover position,
A sheet is folded at a predetermined position as a crease, and is formed continuously on the peripheral plate constituting the peripheral wall, the bottom plate forming the bottom wall by being continuously formed on the lower edge of the peripheral plate, and the upper edge of the peripheral plate. In the development body of the packaging box formed with the cover plate constituting the lid body,
The surface of the sheet constitutes the outer surface of the packaging box, and the rear surface constitutes the inner surface of the packaging box.
Each of the peripheral plates has a rectangular shape, and includes four side plates that are continuously provided so as to be annular,
Folding the boundary position between the first side plate that hits one of the four side plates and the fourth side plate connected to the first side plate, the back side of the first side plate and the fourth side plate are folded so that they overlap each other.
Folding the boundary position between the second side plate connected to the first side plate and the third side plate connected to the second side plate, the second side plate and the third side plate are folded so that the back surfaces of the second side plate and the third side plate overlap each other.
The cover plate includes a pair of cover plates constituting the pair of cover walls, and a pair of folding plates constituting the pair of holding pieces;
The pair of cover plates are continuously formed on each of the first side plate and the third side plate,
The pair of folding plates are continuously formed on each of the second side plate, the fourth side plate, and the adjacent pair of cover plates,
The first side plate and the second side plate, and the cover plate and the folding plate continuously formed thereon are provided on the same plane,
The third side plate and the fourth side plate, and the cover plate and the folding plate continuously formed thereon are provided on the same plane,
Each folding plate is formed with a pair of isosceles portions inclined at an approximately equal angle upward from both end portions of the second and fourth boundary portions that hit the boundary with the peripheral plate,
Each folding plate has the second and fourth boundary portions and the isosceles portion as folds, and the boundary edge between each cover plate and each folding plate is a fold, and the boundary edge is the second, Folded so as to overlap the fourth boundary portion, the portion surrounded by the second and fourth boundary portions and the pair of isosceles portions is configured to be folded so as to overlap the surface of the peripheral plate,
Each of the cover plates is formed with a pair of oblique sides inclined at an approximately equal angle upward from both end portions of the first and third boundary portions that hit the boundary with the peripheral plate,
Each of the cover plates is configured to be folded into a mountain fold with each oblique side as a crease.

According to a fourth aspect of the present invention, in the third aspect of the present invention, either one or both of the pair of cover plates are extended to the extending direction edge of the cover plate, and the edge ends. It has a handle plate that can be bent at
In the cover plate in which the hand plate is extended, the upper ends of the pair of oblique sides reach both end portions in a connecting portion between the cover plate and the hand plate.

  According to a fifth aspect of the present invention, in the invention according to the third or fourth aspect, at least one of the pair of cover plates has an extending portion formed to extend in a surface direction. It is provided between each oblique side and the boundary edge.

  According to the packaging box according to claim 1, the sheet for producing the packaging box is folded with a predetermined position as a fold, so that a box body having an opening on the upper side is formed, and the covering wall is formed by the box body. In a state where the cover is positioned to cover the opening, the pair of holding pieces are respectively the second and fourth boundary portions corresponding to the boundary with the second and fourth side walls, and both ends of the second and fourth boundary portions. A pair of isosceles parts inclined substantially upward from the part, each of which is a crease, and the boundary edge is folded so as to overlap the second and fourth boundary parts, A portion surrounded by the fourth boundary portion and the pair of isosceles portions overlaps the surfaces of the second and fourth side walls. Here, the portion surrounded by each of the second and fourth boundary portions and the pair of isosceles portions is folded so as to overlap the surface of each of the second and fourth side walls, so that the pair of cover walls are covered. It will be guided to the position.

  At this time, as the portions surrounded by the second and fourth boundary portions and the pair of isosceles portions are folded so as to overlap the surfaces of the second and fourth side walls, The first and third boundary portions that hit the boundary with the first and third side walls are rotated about the first and third boundary portions and guided to the cover position, that is, displaced. The portions surrounded by the second and fourth boundary portions and the pair of isosceles portions are folded back so as to be separated from the surfaces of the first and third side walls, and the pair of cover walls are separated from the cover positions of the box body. In some cases, the opening may return to the exposure position where the opening is exposed. That is, the lid may open.

  Accordingly, in the packaging box of the present invention, each cover wall is inclined with a substantially equal angle from both ends of each of the first and third boundary portions corresponding to the boundary with each of the first and third side walls. Are formed up to the edge in the extending direction of each cover wall, and each cover wall is folded in a mountain fold with each oblique side as a fold, so that the pair of oblique sides become ridge lines in a state of being located at the cover position. It is formed in a mountain shape. At this time, in each cover wall, the trapezoidal portion surrounded by the pair of oblique sides is inclined upward as it goes from the lower base to the upper base, thereby the first and third side walls. An inward force is generated so that the width between them is reduced, and this inward force causes each of the second and fourth boundary portions to warp in a bow shape so that the width between the first and third side walls is reduced. The pair of holding pieces are pressed against the surfaces of the second and fourth side walls while curving in the same direction as the second and fourth boundary portions.

  Thus, the packaging box is held with the pair of holding pieces pressed against the surfaces of the second and fourth side walls with the pair of covering walls positioned at the covering position, and the pair of covering walls. Can be prevented from returning from the cover position to the exposed position where the opening of the box body is exposed. For this reason, unlike the prior art, in order to hold the lid at the cover position, it is not necessary to lock the holding piece to the peripheral wall. Accordingly, it is possible to reliably hold the lid at the cover position in the assembled state while improving the assembling workability, and to provide a packaging box having a beautiful box shape while stably maintaining a predetermined shape. be able to.

  According to the packaging box of the second aspect, either one or both of the pair of cover walls are provided with the handle wall attached to the edge in the extending direction of the cover wall. Thus, by providing a handbag in the packaging box, a handle can be obtained and convenience can be improved.

  In addition, when the connecting portion between the cover wall and the hander wall is provided in the vicinity of the edge portions on the edge side of the pair of oblique sides, the pair of cover walls are located at the cover position, and the hander wall When the box main body is provided by the above, the weight of the contents accommodated in the box main body is also helped, and a force to be pulled up and down acts on the pair of cover wall and bottom wall. At this time, a force pulled upward acts on the base portion (the connecting portion between the cover wall and the handle wall) on the pair of cover walls. In this way, a force that is pulled upward acts on the root portion, so that a large inward force is generated so that the width between the first and third side walls is narrowed. By this inward force, Each of the second and fourth boundary portions warps like a bow so that the width between the first and third side walls is narrowed, and the pair of holding pieces warp in the same direction as each of the second and fourth boundary portions, It will be pressed against the surface of each second and fourth side wall. In this way, the packaging box is reliably held while the pair of holding pieces are pressed against the surfaces of the second and fourth side walls in a state where the pair of covering walls are located at the covering position. In addition, the load is concentrated on both ends of the base portion of the pair of cover walls, but this load is distributed to each hypotenuse, and thus the load on the base portion is reduced. As a result, the durability of the packaging box can be improved.

  According to the expansion body of the packaging box according to claim 3, the first side plate and the fourth side plate are folded up with the boundary position between the first side plate and the fourth side plate as a fold, so that the second side plate is separated from each other. The second side plate and the third side plate are folded so as to be separated from each other with the boundary position between the first side plate and the third side plate as a crease, and the bottom plate is folded up so as to close the lower side opening, thereby having an upper opening. A box body is formed. That is, the box body with the upper opening exposed is formed. In addition, each folding plate is formed with a pair of isosceles portions that are inclined at an approximately equal angle upward from both ends of the second and fourth boundary portions that hit the boundary with the peripheral plate. The plate has creases at the second and fourth boundary portions and isosceles sides, and folds at the boundary edges between the cover plates and the folding plates, so that the boundary edges overlap the second and fourth boundary portions. The portion that is folded and surrounded by the second and fourth boundary portions and the pair of isosceles portions is configured to be folded so as to overlap the surface of the peripheral plate. Here, the pair of cover plates covers the opening of the box body by folding the portion surrounded by the second and fourth boundary portions and the pair of isosceles portions so as to overlap the surface of the peripheral plate. It will be guided to the position. At this time, each cover plate is folded in a mountain fold with the pair of oblique sides as folds. Thus, the expansion | deployment body which can form a packaging box can be provided by an easy operation | work.

  According to the expansion body of the packaging box according to the fourth aspect, the upper ends of the pair of oblique sides are formed so as to reach both ends of the connecting portion between the cover plate and the hand plate. In the packaging box assembled by this unfolded body, when the box body is raised by the wall with the pair of cover walls positioned at the cover position, the contents stored in the box body In addition, the force that is pulled up and down acts on the pair of cover walls and the bottom wall. At this time, a force pulled upward acts on the base portion (the connecting portion between the cover wall and the handle wall) on the pair of cover walls. In this way, a force that is pulled upward acts on the root portion, so that a large inward force is generated so that the width between the first and third side walls is narrowed. By this inward force, Each of the second and fourth boundary portions warps like a bow so that the width between the first and third side walls is narrowed, and the pair of holding pieces warp in the same direction as each of the second and fourth boundary portions, It will be pressed against the surface of each second and fourth side wall. In this way, the packaging box is reliably held while the pair of holding pieces are pressed against the surfaces of the second and fourth side walls in a state where the pair of covering walls are located at the covering position. Accordingly, the pair of holding pieces are held in a state of being pressed against the surfaces of the second and fourth side walls, and the pair of cover walls return from the cover position to the exposed position where the opening of the box body is exposed. The expansion body of the packaging box which can form the packaging box which can prevent is obtained.

  According to the expansion body of the packaging box according to claim 5, at least one of the pair of cover plates has an extending portion extending in the surface direction between each oblique side and the boundary edge. Is provided. In this way, in the packaging box in an assembled state, the extension portion is overlapped on the surface of the other cover wall with the pair of cover walls positioned at the cover position. Will be blocked. That is, it is possible to obtain a development body for a packaging box that can form a packaging box that can prevent the entry of foreign matter into the box body in a state where the pair of cover walls are located at the cover position.

It is a perspective view of the packaging box concerning one embodiment of the present invention. It is a top view which shows the expansion body of the packaging box concerning one embodiment of this invention. It is a top view which shows the sheet | seat comprised by stamping one sheet | seat material before manufacture of the expansion | deployment body of the packaging box shown by FIG. It is a perspective view which shows the packaging box shown by FIG. 1, (A) is a figure which shows the state in which the cover body was provided in the exposure position, (B) is a cover body provided in the cover position. FIG. It is a perspective view which shows the conventional packaging box described in patent document 1. FIG.

  Hereinafter, a packaging box according to an embodiment which is an exemplary embodiment of the present invention and a developed body thereof will be described with reference to FIGS.

  1 and 4, reference numeral 1A denotes a packaging box according to an embodiment of the present invention. In FIGS. 2 and 4, reference numeral 1 denotes a packaging box according to an embodiment of the present invention. Expanded body. The packaging box development 1 is a development for producing the packaging box 1A.

  The packaging box 1A is formed by folding each fold formed in the development body 1 (shown in FIG. 2) of the packaging box, and as shown in FIG. 4A), and a lid body 7A that covers the opening 20A of the box body 2A. The box body 2A includes a rectangular bottom wall 4A, a first side wall 31A, a second side wall 32A, a third side wall 33A, and a fourth side wall that are erected from the four edges 1a, 2a, 3a, and 4a of the bottom wall 4A. And a side wall 34A. These four side walls 31A, 32A, 33A, 34A constitute a peripheral wall 3A. In the packaging box 1A, in the assembled state, the first side wall 31A and the third side wall 33A are arranged to face each other, and the second side wall 32A and the fourth side wall 34A are arranged to face each other.

  The lid body 7A includes a pair of cover wall walls 71A and 73A extending on the upper edges 1b and 3b of the first and third side walls 31A and 33A facing in the front-rear direction, and the second and fourth side walls facing in the left-right direction. A pair of holding pieces 72A and 74A extended to the upper edges 2b and 4b of 32A and 34A, and upper edges 1c and 3c (edges in the extending direction) of the pair of cover walls 71A and 73A, A pair of handle walls 76A and 76A which are bent at the edges 1c and 3c and overlap each other are configured. The pair of holding pieces 72A and 74A rotate around the edges 2b and 4b positioned at the boundaries with the second and fourth side walls 32A and 34A, respectively, so that the pair of cover walls 71A and 73A are connected to the box body 2A. Guide to the “cover cover position” and “exposure position” covering the opening 20A.

  Here, in this specification, in the packaging box 1A, the opposing direction of the first side wall 31A and the third side wall 33A is indicated by an arrow Z, the penetration direction of the opening 20A of the box body 2A is indicated by an arrow Y, and the arrow Z A direction perpendicular to the bidirectional direction of the arrow Y is indicated by an arrow X. Furthermore, in this specification, the arrow Z may be referred to as the front-rear direction, the arrow X may be referred to as the left-right direction, and the arrow Y may be referred to as the up-down direction. Also, in the front-rear direction, the front side in the direction perpendicular to the paper surface in FIGS. 2 and 3 is referred to as “front”, and the back side is referred to as “rear”. That is, in the present specification, as shown in FIG. 1, the packaging box 1A has the side on which the bottom wall 4A is provided facing downward, and the first and third side walls 31A and 33A are disposed to face each other in the front-rear direction. The second and fourth side walls 32A and 34A are arranged to face each other in the left-right direction.

(Development of packaging box)
As shown in FIG. 2, the unfolding body 1 of the packaging box is obtained by folding a sheet 101 (shown in FIG. 3) obtained by subjecting a sheet of paper to press processing such as punching, with a predetermined position as a fold. It is formed in a plate shape with a small thickness as a whole. In other words, the packaging box unfolding body 1 includes the peripheral plate 3 constituting the peripheral wall 3A, the bottom plate 4 constituting the bottom wall 4A, and the cover plate 7 constituting the lid 7A. The sheet 101 is provided such that the front surface (front surface) in the direction perpendicular to the paper surface in FIG. 3 constitutes the outer surface of the expansion body 1 (packaging box 1A described later) of the packaging box. The surface (back surface) is used so as to constitute the inner surface of the expansion body 1 of the packaging box.

  As shown in FIG. 2, the peripheral plate 3 is formed continuously with the first side plate 31 constituting the first side wall 31A and the side edge d of the first side plate 31, and the second side plate 32A constituting the second side wall 32A. The side plate 32 is continuously formed on the side edge 10b of the second side plate 32, the third side plate 33 constituting the third side wall 33A, and the side edge e of the third side plate 33 are formed continuously. The fourth side plate 34 constituting the fourth side wall 34A and the side edge e of the third side plate 33, which are continuously formed on the side edge 10a opposite to the side edge d of the first side plate 31, are continuously formed on the fourth side plate 34A. And a peripheral plate attaching part 35 attached to the back surface of the side plate 34.

  In the peripheral plate 3, the first side plate 31 and the second side plate 32 are provided on the same plane, the third side plate 33 and the fourth side plate 34 are provided on the same plane, and the first side plate 31 and the fourth side plate 34. With the side edge 10a (hereinafter referred to as one side edge 10a of the unfolding body 1 of the packaging box) being a fold, the back surfaces of the first side plate 31 and the fourth side plate 34 face each other and overlap each other. As described above, the second side plate 32 and the second side plate 32 are connected to the second side plate 32 and the third side plate 33 with the side edge 10b (hereinafter, referred to as the other side edge 10b of the unfolding body 1 of the packaging box) as a fold. The back surface of the third side plate 33 is folded so as to face each other and overlap, and the surface of the peripheral plate pasting portion 35 is bonded and fixed to the fourth side plate 34 in a state where it is overlapped with the back surface of the fourth side plate 34. Thus, the peripheral plate 3 is formed in an annular shape that is continuous in a direction (circumferential direction) in which the side plates 31, 32, 33, and 34 are continuous.

  Of the first side plate 31, the second side plate 32, the third side plate 33, and the fourth side plate 34, the first and third side plates 31 and 33 and the second and fourth side plates 32 and 34 have a substantially planar shape, respectively. It is formed in an equal rectangular shape. The first and third side plates 31, 33 are arranged so that the long sides 1a, 1b, 3a, 3b are along the left-right direction so that the short sides 10a, d, 10b, e are along the up-down direction. The second and fourth side plates 32, 34 are arranged so that the long sides d, 10b, e, 10a are along the vertical direction, and the short sides 2a, 2b, 4a, 4b are along the left-right direction. . The short sides 10a, d, 10b, e of the first and third side plates 31, 33 are formed to have substantially the same length as the long sides d, 10b, e, 10a of the second and fourth side plates 32, 34. Has been.

  The peripheral plate pasting portion 35 is continuously formed on the side edge e of the third side plate 33 opposite to the second side plate 32 and is pasted on the back surface of the fourth side plate 34.

  As shown in FIG. 2, the cover plate 7 includes a pair of cover plates 71 and 73 constituting a pair of cover walls 71A and 73A, a pair of folding plates 72 and 74 constituting a pair of holding pieces 72A and 74A, A cover plate pasting portion 75 and a pair of hand plate 76 and 76 constituting a pair of hand wall 76A are provided. The pair of cover plates 71 and 73 are continuously formed on the upper edges 1b and 3b of the first and third side plates 31 and 33, and the pair of folding plates 72 and 74 are formed on the second and fourth side plates 32 and 34, respectively. The upper edges 2b and 4b are continuously formed.

  Hereinafter, the cover plate continuously formed on the upper edge 1 b of the first side plate 31 will be referred to as a first cover plate 71, and the folding plate continuously formed on the upper edge 2 b of the second side plate 32 will be referred to as a second folding plate 72. The cover plate continuously formed on the upper edge 3 b of the third side plate 33 is referred to as a third cover plate 73, and the folding plate continuously formed on the upper edge 4 b of the fourth side plate 34 is referred to as a fourth folding plate 74. The first cover plate 71 and the third cover plate 73 are formed to have the same function and the same configuration, and the second folding plate 72 and the fourth folding plate 74 are formed to have the same function and the same configuration. Yes.

  As shown in FIG. 2, the cover plate 7 includes a first cover plate 71 and a second folding plate 72 on the same plane, and a third cover plate 73 and a fourth folding plate 74 on the same plane. The second edge is positioned so that the back surfaces of the first cover plate 71 and the fourth folding plate 74 overlap each other with the edge i located at the boundary between the first cover plate 71 and the fourth folding plate 74 as a fold. With the edge g located at the boundary between the folding plate 72 and the third cover plate 73 as a crease, the back surface of the second folding plate 72 and the third cover plate 73 are folded so as to face each other and overlap, The front surface of 75 is bonded and fixed to the fourth folding plate 74 in a state where the front surface of 75 is overlapped with the back surface of the fourth folding plate 74. In this way, the cover plate 7 is formed in an annular shape in which the cover plates 71 and 73 and the folding plates 72 and 74 are alternately provided, and is continuous in the circumferential direction.

  Here, each “fold line” used in the present specification is formed by pressing the sheet 101 and is formed so that a predetermined position of the sheet 101 can be easily folded. .

  Of the first cover plate 71, the second folding plate 72, the third cover plate 73, and the fourth folding plate 74, each of the first and third cover plates 71, 73 is formed in a rectangular shape having substantially the same planar shape. Each of the second and fourth folding plates 72 and 74 is formed in a rectangular shape having substantially the same planar shape.

  Each of the cover plates 71 and 73 has a rectangular short side f, h, i, and g formed continuously on the side edges d, e, 10a, and 10b of the first and third side plates 31 and 33, respectively. Further, the short sides f, h, i, and g of the cover plates 71 and 73 have upper and lower dimensions of the upper edges 2b and 4b of the second and fourth side plates 32 and 34 (the second side plate 32 and the second side plate 32). Dimension from edge 2b positioned at the boundary with the folding plate 72 and corner 4a located at both ends of the edge 4b) positioned at the boundary between the fourth side plate 34 and the fourth folding plate 74 to the middle point B Are formed so as to have substantially the same dimensions. Thus, when the pair of cover plates 71 and 73 are located at the cover positions, the short sides f, h, i, and g of the cover plates 71 and 73 are respectively connected to the second and fourth side plates 32 and 34 and the respective first plates. 2 and overlapped with each edge 2b, 4b located at the boundary with the fourth folding plates 72, 74.

  The upper edge 2b of the second side plate 32, the edge 2b located at the boundary between the second side plate 32 and the second folding plate 72, the upper edge 4b of each fourth side plate 34, the fourth side plate 34, and the second The edge 4b located at the boundary with the 4-fold plate 74 indicates the same part. Thus, as used in the present specification, the “end”, “edge (side edge)”, “long side (short side)”, “upper base (lower base)”, etc. For example, even if the names are different, the same reference numerals are given. In the following, the upper edge 1b of the first side plate 31, that is, the edge located at the boundary between the first side plate 31 and the first cover plate 71 is referred to as a first boundary portion 1b, and the upper edge of the second side plate 32. 2b, that is, the edge located at the boundary between the second side plate 32 and the second folding plate 72 is referred to as a second boundary portion 2b, and the upper edge 3b of the third side plate 33, that is, the third side plate 33 and the third cover. The edge located at the boundary with the plate 73 is referred to as a third boundary portion 3b, and the upper edge 4b of the fourth side plate 34, that is, the edge located at the boundary between the fourth side plate 34 and the fourth folding plate 74 is Sometimes referred to as a four boundary portion 4b.

  Further, the first and third cover plates 71 and 73 are inclined upward at substantially equal angles from the corners a located at both ends of the first and third boundary portions 1b and 3b. A pair of hypotenuses s and s are formed. In other words, the pair of oblique sides s and s are formed so as to incline in directions in which the cover plates 71 and 73 approach each other as they go upward. Each hypotenuse s has a lower end located at each corner i located at each end of each of the first and third boundary portions 1b and 3b, and an upper end located at each of the first and third cover plates 71 and 73. It is formed so as to coincide with the point c on the upper edges 1c and 3c. Each of the first and third cover plates 71 and 73 is configured such that the first and third cover plates 71 and 73 are folded in a mountain fold with each oblique side s as a fold. In the present specification, “mountain fold” refers to folding the sheet 101 into a mountain shape when viewed from the surface side, and “valley fold” refers to a valley shape when the sheet 101 is viewed from the surface side. Folding to mean each.

  The first cover plate 71 includes a first trapezoidal portion 81 and a pair of triangular portions 82 and 84 provided on both the left and right sides of the first trapezoidal portion 81. The third cover plate 73 includes a third trapezoidal portion 83 and a pair of triangular portions 82 and 84 provided on both the left and right sides of the third trapezoidal portion 83. The trapezoidal portions 81 and 83 and the pair of triangular portions 82 and 84 are continuously formed through a pair of oblique sides s and s. Further, the triangular portion 82 continuing to the first trapezoidal portion 81 and the triangular portion 82 continuing to the third trapezoidal portion 83 are second folded via the side edges f and g of the second folding plate 72. It is formed continuously on both sides of the plate 72, and the triangular portion 84 that continues to the first trapezoidal portion 81 and the triangular portion 84 that continues to the third trapezoidal portion 83 are each of the fourth folding plate 74. It is formed continuously on both sides of the fourth folding plate 74 via the side edges h and i.

  Each of the trapezoidal portions 81 and 83 has a lower bottom between the corners a located at both ends of each of the first and third boundary portions 1b and 3b, and an upper bottom of each of the first and third cover plates 71, 73 between the upper edges 1c and 3c of the upper edges 1c and 3c (the positions excluding the upper edge 1c and the upper edges 1c and 3c of the first and third cover plates 71 and 73 from the two ends to the point ha). It is formed in the shape of an isosceles trapezoid. The shortest distance from the lower base 1b, 3b to the upper base of each trapezoidal portion 81, 83, that is, the dimension along the top and bottom, is from the corners a located at the both ends of the second and fourth boundary portions 2b, 4b to the midpoint It is formed to be approximately equal to the dimension up to b. Each of the trapezoidal portions 81 and 83 forms a trapezoidal wall 81A and 83A in a state where the pair of cover plates 71 and 73 are provided at the cover position, and the upper bases thereof are the first and third side plates 31 and 31. It is provided so that it may be located in the center part between 33 (front-back direction), and it inclines so that it may narrow upwards, as it goes to the upper base from the lower bases 1b and 3b.

  Each pair of triangular portions 82 and 84 is formed in a right-angled isosceles triangular shape with the bases being the side edges f, h, i, and g of the cover plates 71 and 73 and each hypotenuse s being the hypotenuse. . Each pair of triangular portions 82, 84 has a pair of base plates f, h as the pair of continuous plates 12, 12 are folded in a mountain fold with each isosceles portion v as a crease and overlapped with the folding portion 11. , I, g are tilted, overlapped with the second and fourth boundary portions 2b, 4b, and the upper end D is overlapped with the middle point B.

  As shown in FIG. 2, each of the second and fourth folding plates 72 and 74 includes a triangular folding portion 11 and first and third cover plates 71 on both the left and right sides of the folding portion 11, respectively. 73 and a pair of continuous plates 12, 12 formed continuously.

  Each folding part 11 has a pair of isosceles parts v and v that are inclined at an approximately equal angle from the corners a located at both ends of the second and fourth boundary parts 2b and 4b. Thus, it is formed in a right isosceles triangle shape. Each pair of continuous plates 12 has the isosceles portions v and v as the bottom, the upper edges 2c and 4c of the second and fourth folding plates 72 and 74, and the side edges f and h of the folding plates 72 and 74, respectively. It is formed in a triangular shape with the apex angle at the contact point with i and g.

  The cover plate pasting portion 75 is continuously formed on the side edge h on the opposite side of the second folding plate 72 in the third cover plate 73 and is stuck on the back surface of the fourth folding plate 74.

  The pair of handle plates 76, 76 are formed in a substantially C shape, and extend upward from the upper edges (extension direction end edges) 1c, 3c of the first and third cover plates 71, 73, respectively. Is formed. That is, each handle plate 76 is connected to each cover plate 71, 73 at each base portion k, k. The left and right outer end portions C of the two base portions k are formed so as to coincide with the upper end portion C of each hypotenuse s.

  In the present embodiment, each of the handle plates 76 is configured to have two root portions k, but the present invention is not limited to this. Each base plate may have a base portion continuously formed on each of the first and third cover plates 71 and 73 from one end C to the other end C. That is, each handle plate may be connected to each of the first and third cover plates 71 and 73 at one location. In the present embodiment, the hand plate 76 is continuously formed on each of the first and third cover plates 71 and 73, but the present invention is not limited to this. The handle plate may be formed continuously only on one of the first cover plate 71 and the third cover plate 73. When the hand plate is continuously formed on only one of the first cover plate 71 and the third cover plate 73, the hand plate is the third cover plate 73, that is, the second extension piece. It is preferable that 79 is continuously formed on the cover plate that is not continuously formed. Alternatively, the handle plate may not be continuously formed on the first and third cover plates 71 and 73. That is, the handle plate may be omitted. In this case, the handle plate may be configured separately. For example, a string-like member may be attached to either one or both of the first and third cover plates 71 and 73. Good. In that case, it is preferable that the connection part of a cover board and a string-like member is provided in the vicinity of the edge part side edge side of a pair of oblique sides.

  Each of the first and third cover plates 71 and 73 has a pair of first extending pieces 78 extending from the upper edge 1c of the first cover plate 71 in the surface direction of the first cover plate 71, 78 (corresponding to “extending piece” in the claims) and a second extending piece 79 are provided. Each first extending piece 78 is formed to extend upward from the entire length between both ends D of the upper edge 1c of the first cover plate 71 and the upper end C of the oblique side s. In addition, each 1st extension piece 78 may be provided in the 3rd cover plate 73, and 1 or 2 may be provided in both of each 1st, 3rd cover plate 71,73. Each of the second extending pieces 79 is formed to extend upward from the entire length between the pair of root portions k of the upper edge 1 c of the first cover plate 71.

  Further, each of the second and fourth folding plates 72 and 74 is provided with an overlapping piece 77 that extends in the surface direction and overlaps the other surface on one of the pair of continuous plates 12 and 12. ing. The overlapping piece 77 is provided on each of the continuous plates 12 that are continuously formed on the left and right sides of the first cover plate 71.

  The bottom plate 4 includes a pair of bottom plate bodies 41 and 43 continuously formed on the lower edges 1a and 3a of the first and third side plates 31 and 33, and the lower edges 2a of the second and fourth side plates 32 and 34, respectively. 4a, a pair of reinforcing pieces 42, 44 formed continuously, and a pair of quadrangular bottom plate attaching portions 45, 45 connected to the pair of bottom plate bodies 41, 43, respectively. Of the pair of bottom plate bodies 41, 43, the one continuously formed on the lower edge 1a of the first side plate 31 is referred to as a first bottom plate body 41, and the one continuously formed on the lower edge 3a of the third side plate 33 is a third. Sometimes referred to as a bottom plate main body 43. Of the pair of reinforcing pieces 42, 44, one continuously formed on the lower edge 2 a of the second side plate 32 is referred to as a second reinforcing piece 42, and one continuously formed on the lower edge 4 a of the fourth side plate 34. The fourth reinforcing piece 44 may be described.

  The pair of bottom plate main bodies 41 and 43 are formed in a substantially trapezoidal shape with the lower edges 1a and 3a of the first and third side plates 31 and 33 as the lower bottom. Each of the bottom plate bodies 41 and 43 is formed such that the upper base m is shorter than the lower bases 1a and 3a. In the first bottom plate main body 41, a bottom plate pasting portion 45 is continuously formed on the oblique side z on one side edge 10a side of the development body 1 of the packaging box, and the third bottom plate main body 43 has the development body of the packaging box. A bottom plate pasting portion 45 is continuously formed on the hypotenuse z on the other side edge 10b side.

  A pair of engaging pieces 46, 46 are formed on the pair of bottom plate bodies 41, 43. Each engagement piece 46 is provided in the shape which can mutually engage. When these engagement pieces 46 are engaged with each other, the engagement state between the pair of bottom plate bodies 41 and 43 is maintained. Each engagement piece 46 is formed to extend in the surface extending direction from the upper base m of each bottom plate body 41, 43.

  The pair of reinforcing pieces 42 and 44 are formed in a trapezoidal shape with the lower edges 2a and 4a of the second and fourth side plates 32 and 34 as the bottom. The upper base n of each reinforcing piece 42, 44 is formed to be shorter than each lower base 2a, 4a. In the upper base n of each reinforcing piece 42, 44, the left and right ends are provided inside the side edges d, e, 10 a, 10 b of the first and third side plates 31, 33.

  The bottom plate affixing portion 45 is folded into a valley fold with the hypotenuse z located at the boundary with each of the first and third side plates 31 and 33 as a fold, and is affixed to the surface of each of the second and fourth reinforcing pieces 42 and 44. ing.

  Such a bottom plate 4 is formed between the first bottom plate main body 41 and the first side plate 31 with the edge 1a (the lower edge 1a of the first side plate 31) located at the boundary between the first bottom plate main body 41 and the first side plate 31 as a fold. The second reinforcing piece 42 and the second side plate 32 with the edge 2a (the lower edge 2a of the second side plate 32) located at the boundary between the second reinforcing piece 42 and the second side plate 32 as a fold so that the back surfaces are overlapped with each other. The third bottom plate main body 43 and the third side plate 33 with the edge 3a (the lower edge 3a of the third side plate 33) located at the boundary between the third bottom plate main body 43 and the third side plate 33 as a fold. And the fourth reinforcing piece 44 and the fourth side plate with the edge 4a (the lower edge 4a of the fourth side plate 34) located at the boundary between the fourth reinforcing piece 44 and the fourth side plate 34 as a fold. It is folded so that the back surfaces of 34 overlap each other. That is, the first bottom plate body 41 and the fourth reinforcing piece 44 are sandwiched between the first and fourth side plates 31 and 34, and the second reinforcing piece 42 is interposed between the second and third side plates 32 and 33. And the third bottom plate main body 43 are sandwiched. Each bottom plate pasting portion 45 is folded into a valley fold with the oblique side z located at the boundary between each first and third side plates 31 and 33 as a fold, and the back surface of each bottom plate pasting portion 45 is second, The fourth reinforcing pieces 42 and 44 are bonded and fixed in a state of being superimposed on the surface.

(Assembly method of packaging box unfolding body)
Then, the assembly procedure of 1 A of packaging boxes comprised using the expansion | deployment body 1 of a packaging box is demonstrated with reference to FIG. 2, FIG. 4 (A) (B).

  First, one side edge 10a of the packaging box unfolded body 1 shown in FIG. 2 so that the one side edge 10a of the packaging box unfolded body 1 and the other side edge 10b are brought close to each other. Folding the first side plate 31 and the fourth side plate 34 apart from each other (the boundary position between the first side plate 31 and the fourth side plate 34) as a crease, the other side edge of the developing body 1 of the packaging box 10b (boundary position between the second side plate 32 and the third side plate 33) is folded so that the second side plate 32 and the third side plate 33 are separated from each other. Then, a pair of openings 20A (upper side openings 20A) are formed. As the distance further increases, the opening 20A is gradually enlarged. Accordingly, the first bottom plate body 41 continuously formed on the lower edge 1a of the first side plate 31 which is a part of the opening edge on the lower side, and the fourth reinforcing piece continued on the lower edge 4a of the fourth side plate 34. 44 is folded up so as to close the opening on the lower side, the second reinforcing piece 42 continued to the lower edge 2 a of the second side plate 32, and the third continuous to the lower edge 3 a of the third side plate 33. The bottom plate body 43 is folded up so as to close the opening on the lower side. As the distance further increases, the engagement piece 46 of the first bottom plate main body 41 and the engagement piece 46 of the third bottom plate main body 43 come into contact with each other. The joining piece 46 (the other engagement piece 46) rides on and over the other engagement piece 46 (one engagement piece 46). Thus, the engagement pieces 46 are engaged with each other, and the engagement state between the pair of bottom plate bodies 41 and 43 is maintained. In a state where the pair of bottom plate bodies 41 and 43 are engaged with each other, the opening on the lower side of the packaging box 1A in the assembled state is closed. As described above, the box body 2A is assembled.

  Thereafter, as shown in FIG. 4A, each of the first and third cover plates 71 and 73 and the handle plate 76 is folded into a mountain fold using the first and third boundary portions 1b and 3b as folds. The edges 1c and 3c located at the boundary are folded into valley folds to give creases. Thus, each formed cover wall 71A, 73A will be in the state located in the "exposed position" which exposes the opening 20A above the box main body 2A.

  Then, each pair of isosceles portions v, v is a crease, and each fold portion 11 and the pair of continuous plates 12, 12 are folded in a mountain fold so that the back surfaces thereof face each other and overlap each other. Then, the boundary edges f, h, i, and g between the cover plates 71 and 73 and the folding plates 72 and 74 overlap the second and fourth boundary portions 2b and 4b, respectively. Further, the trapezoidal portions 81 and 83 are contacted at their upper bases 1c and 3c to form the trapezoidal walls 81A and 83A. The triangular walls 82A and 84A are formed from the pair of triangular portions 82 and 84, respectively. Composed. At substantially the same time, the back surface of the hand plate 76 is opposed and overlapped to form the hand wall 76A.

  Furthermore, each folding part 11 and the pair of continuous plates 12, 12 are overlapped with each other, each second boundary part 2b and each boundary edge f, h, and each fourth boundary part 4b and each boundary edge i, g, And a pair of holding pieces 72A and 74A are formed by bending the shaft so as to be close to the surfaces of the second and fourth side plates 32 and. In this way, as shown in FIG. 4B, the pair of cover walls 71A and 73A are in the “cover position”, and the packaging box 1A is assembled.

  In the packaging box 1A assembled in this way, the pair of holding pieces 72A and 74A are rotated about the second and fourth boundary portions 2b and 4b, and each cover lid wall 71A is accompanied with this rotation. 73A are pivoted about the first and third boundary portions 1b and 3b, and the lid is placed between the “lid cover position” covering the opening 20A of the box body 2A and the “exposed position” exposing the opening 20A. The body 7A is displaced so as to be rotatable.

(Packaging box)
As shown in FIG. 1, the packaging box 1A includes a box body 2A having an opening 20A on the upper side, and a lid body 7A extending to the opening edges 1b, 2b, 3b, and 4b of the box body 2A. Yes. The box main body 2A includes a rectangular bottom wall 4A and a peripheral wall 3A provided upright from each of the four edges 1a, 2a, 3a, and 4a of the bottom wall 4A, and has a bottom with an opening 20A on the upper side. It is formed in a cylindrical shape. The peripheral wall 3A has a first side wall 31A erected from the edge 1a of the bottom wall 4A, a second side wall 32A erected from the edge 2a of the bottom wall 4A, and a first side wall 31A erected from the edge 3a of the bottom wall 4A. 3 side wall 33A and the 4th side wall 34A standingly arranged from the edge 4a of the bottom wall 4A are provided, and it is formed in the square cylinder shape. The first side wall 31A and the third side wall 33A are arranged to face each other, and the second side wall 32A and the fourth side wall 34A are arranged to face each other.

  The bottom wall 4A includes a pair of bottom wall bodies 41A and 43A constituting the first and third bottom plate bodies 41 and 43, and a pair of reinforcing walls 42A and 44A constituting the second and fourth reinforcing pieces 42 and 44, A pair of bottom wall sticking portions 45A and 45A constituting the pair of bottom plate sticking portions 45 are provided. The bottom wall 4A is folded up so that the first side wall 31A and the fourth side wall 34A are separated from each other, and the second side wall 32A and the fourth side wall 34A are folded up so as to be separated from each other. It is formed by folding up so as to close the opening on the lower side of the.

  Further, in the assembled state of the packaging box 1A, the four edges 1a, 2a, 3a, 4a of the bottom wall 4A are the edges 1a located at the boundary between the first bottom wall body 41A and the first side wall 31A, and the second reinforcement. At the edge 2a located at the boundary between the wall 42A and the second side wall 32A, at the edge 3a located at the boundary between the third bottom wall main body 43A and the third side wall 33A, and at the boundary between the fourth reinforcing wall 44A and the fourth side wall 34A It is the edge 4a located. The first side wall 31A is erected from the edge 1a of the bottom wall 4A, the second side wall 32A is erected from the edge 2a of the bottom wall 4A, and the third side wall 33A is erected from the edge 3a of the bottom wall 4A. The side wall 34A is erected from the edge 4a of the bottom wall 4A. These four edges 1a, 2a, 3a, 4a constitute "four edges of the bottom wall" in the claims. Also, these four edges 1a, 2a, 3a, 4a constitute an opening edge on the lower side of the peripheral wall 3A.

  Further, in the assembled state of the packaging box 1A, the pair of bottom wall main bodies 41A and 43A are maintained in the engaged state by the pair of engaging pieces 46 and 46 being engaged with each other. ing. By maintaining this engaged state, the state where the opening on the lower side of the peripheral wall 3A is closed is continued. In the assembled state of the packaging box 1A, the pair of bottom wall attaching portions 45A, 45A are attached to the upper surfaces of the pair of reinforcing walls 42A, 44A, and the pair of bottom wall main bodies 41A, 43A are paired with the pair of reinforcing walls 42A. , 44A are provided so as to overlap the upper surface.

  The lid body 7A includes a pair of cover lid walls 71A and 73A, a pair of holding pieces 72A and 74A, and a pair of handle walls 76A and 76A. The pair of holding pieces 72A and 74A rotate around the second and fourth boundary portions 2b and 4b to guide the pair of cover walls 71A and 73A to the “cover position” and “exposed position”.

  The pair of cover walls 71A and 73A are the first and third trapezoidal walls 81A and 83A constituting the first and third trapezoidal portions 81 and 83, and the first trapezoidal portion 81 and the third trapezoidal portion 83. The second triangular wall 82A constituting each triangular portion 82 on the two folding plate 72 side, and each triangular portion 84 on the fourth folding plate 74 side of the first trapezoidal portion 81 and the third trapezoidal portion 83 are configured. A fourth triangular wall 84A. In other words, the second triangular wall 82A is composed of triangular portions 82 and 82 adjacent to the left and right sides of the second folding plate 72, and the fourth triangular wall 84A is adjacent to the left and right sides of the fourth folding plate 74. It is comprised from the triangular-shaped parts 84 and 84 which do.

  The first and third trapezoidal walls 81A and 83A have lower bottoms between the corners a located at both ends of the first and third boundary portions 1b and 3b, and the upper bottoms of the first and third cover walls. 71A and 73A are formed in an isosceles trapezoidal shape with the hypotenuses s as the hypotenuses between the points C on the upper edges 1c and 3c. The trapezoidal walls 81A and 83A are in contact with each other at the cover position at the center in the front-rear direction of the opening 20A of the box body 2A.

  The second and fourth triangular walls 82A and 84A are angles formed by the hypotenuses s located at the boundaries between the first and third trapezoidal portions 81 and 83 with the second and fourth boundary portions 2b and 4b as the bottoms. It is formed in an isosceles triangle shape with the top c.

  The second and fourth triangular walls 82A and 84A are boundary edges between the cover plates 71 and 73 and the folding plates 72 and 74 when the cover walls 71A and 73A are rotated from the exposed position to the cover position. By tilting f, h, i, and g so as to overlap the second and fourth boundary portions 2b and 4b, the triangular portions 82 and 82 on the left and right sides of the second folding plate 72 are adjacent in the front-rear direction. The triangular portions 84 and 84 on both the left and right sides of the fourth folding plate 74 are provided side by side at positions adjacent to each other in the front-rear direction.

  The pair of holding pieces 72 </ b> A and 74 </ b> A includes a folding wall 11 </ b> A that constitutes each folding part 11, and a pair of continuous walls 12 </ b> A and 12 </ b> A that constitute each pair of continuous plates 12 and 12. The pair of continuous walls 12A, 12A is folded in a mountain fold so that the pair of isosceles portions v, v are folds, and the back surfaces of the folded portion 11 and the pair of continuous plates 12, 12 are opposed to each other. In the state in which the pair of cover walls 71A and 73A are located at the cover position, they are provided side by side at positions adjacent to each other in the front-rear direction in a state of being superimposed on the back surface of the folding wall 11A.

  The pair of handle walls 76A and 76A are provided so that the back surfaces of the pair of cover walls 71A and 73A are positioned at the cover position, and are erected upward from each base portion k.

  When such a lid 7A is moved from the “exposed position” to the “covered cover position”, the pair of holding pieces 72A and 74A are moved to the second and the fourth boundary portions 2b and 4b using the folds. By folding the four side walls 32A and 34A so as to overlap each other, the second and fourth boundary portions 2b and 4b are rotated as axes. As a result, the boundary edges f, h, i, g between the cover walls 71A, 73A and the holding pieces 72A, 74A are tilted and overlapped with the second and fourth boundary portions 2b, 4b. The cover walls 71A and 73A are rotated about the first and third boundary portions 1b and 3b and guided to the cover position.

  In a state where the pair of cover walls 71A and 73A are positioned at the cover position, the first and second extending pieces 78 and 79 are overlapped on the surface of the third cover wall 73A. The first and second extending pieces 78 and 79 block the gap between the first and third cover walls 71A and 73A, and thus prevent foreign matter from entering the box body 2A. At this time, the overlapping piece 77 is overlapped on the surface of the other continuous wall 12A. The overlapping piece 77 can be made beautiful by overlapping the surface of the other continuous wall 12A, but the overlapping piece 77 may be omitted.

  On the other hand, when the pair of cover walls 71A and 73A are moved from the “cover position” to the “exposure position”, the pair of holding pieces 72A and 74A are moved around the second and fourth boundary portions 2b and 4b. The second and fourth side walls 32A and 34A are rotated in a direction away from the surface. As a result, the boundary edges f, h, i, g between the cover walls 71A, 73A and the holding pieces 72A, 74A stand apart from the second and fourth boundary portions 2b, 4b. Along with this, the pair of cover walls 71A and 73A are rotated about the first and third boundary portions 1b and 3b and guided to the exposure position. In this manner, the pair of cover walls 71A and 73A is in the “exposed position”. The packaging box 1A configured as described above is configured such that the lid body 7A can rotate between an “covering cover position” covering the opening 20A of the box body 2A and an “exposing position” exposing the opening 20A.

  When such a packaging box 1A is provided with the box body 2A by the handle wall 76A with the pair of cover walls 71A and 73A positioned at the cover position, The weights F1 and F2 (shown in FIG. 4B) are applied to the pair of cover walls 71A and 73A and the bottom wall 4A. At this time, the pair of cover walls 71A and 73A is deformed so as to have a mountain shape raised so that the root portion k is the top portion by the force F1 pulled upward on the root portion k. It becomes. That is, the trapezoidal walls 81A and 83A are provided so as to incline upward in the cover position from the lower bases 1b and 3b toward the upper bases 1c and 3c. The triangular walls 82A and 84A are provided at the cover positions. In FIG. 2, the lower bases 2b and 4b are provided so as to incline upward toward the top part C.

  Here, an inward force F3, F4 is generated so that the width between the first and third side walls 31A, 33A is reduced by the force F1 acting on each base portion k of the handle wall 76A. With these forces F1 and F2, the second and fourth boundary portions 2b and 4b have a width between the first and third side walls 31A and 33A while a mountain fold crease is applied with the pair of hypotenuses s as a crease. The pair of holding pieces 72A and 74A are warped in the same direction as the second and fourth boundary portions 2b and 4b and pressed against the surfaces of the second and fourth side walls 32A and 34A. It will be. Thus, the lid body 7A is held at the cover position.

  Once the pair of hypotenuses s is creased, even if the box body 2A is not provided by the handle wall 76A, that is, even if the vertical forces F1 and F2 are not applied, the pair of cover walls 71A and 73A are mountain-shaped so that the root portion k is the top. Thereby, in the packaging box 1A in an assembled state, the box shape can be made beautiful while maintaining a predetermined shape stably.

  Therefore, in the packaging box 1A in the assembled state, the pair of holding pieces 72A, 74A are held in a state of being pressed against the surfaces of the second and fourth side walls 32A, 34A, and the pair of cover wall 71A, 73A. Can be prevented from returning from the cover position to the exposed position where the opening of the box body 2A is exposed.

  Further, when the box body 2A is provided by the hand wall 76A, the load is concentrated on both ends C of the base portion k of the hand wall 76A. Accordingly, the load applied to the root portion k is reduced, and the durability is improved.

  Although the present invention has been described with reference to the preferred embodiment, the present invention is not limited to the configuration of the above embodiment.

  In the embodiment described above, the box body 2A is provided by the hand wall 76A, and the force F1 acts on the base portions k of the pair of cover walls 71A and 73A, so that the space between the first and third side walls 31A and 33A. Although the inward forces F3 and F4 are generated so that the width is reduced, the pair of hypotenuses s are naturally folded, but the present invention is not limited to this. In the assembly stage of the packaging box 1A, the cover walls 71A and 73A may be folded in a mountain fold with the oblique sides s of the cover walls 71A and 73A as folds, and creases may be provided in advance. By doing so, in the packaging box 1A in the assembled state, it is possible to make the box shape even more beautiful while stably maintaining the predetermined shape.

  In the above-described embodiment, the bottom wall 4A includes a pair of reinforcing walls 42A and 44A, a pair of bottom wall main bodies 41A and 43A, and a pair of bottom wall attaching portions 45A and 45A. However, the present invention is not limited to this. For example, the bottom wall 4A may be composed of one or more plates (walls) that can cover the opening on the lower side of the peripheral wall 3A.

  Each embodiment mentioned above only showed the preferred form of the present invention, and the present invention is not limited to these embodiments. That is, those skilled in the art can implement various modifications according to conventionally known knowledge without departing from the scope of the present invention. Of course, such modifications are also included in the scope of the present invention as long as they have the configuration of the packaging box of the present invention and the configuration of the packaging box.

1 Packaging Box 1A Packaging Box 101 Sheet 3 Peripheral Plate 3A Perimeter Wall 4 Bottom Plate 4A Bottom Wall 31 First Side Plate 31A First Side Wall 32 Second Side Plate 32A Second Side Wall 33 Third Side Plate 33A Third Side Wall 34 Fourth Side plate 34A Fourth side wall 71, 73 A pair of cover plates 71A, 73A A pair of cover walls 72, 74 A pair of folding plates 72A, 74A A pair of holding pieces 76 A hand plate 76A A hand wall k Root portion (connecting portion)
C Both ends f, h, i, and g at the connecting portion Boundary edges s and s between each cover plate and each folding plate

Claims (5)

A box-shaped main body having a rectangular bottom wall and a peripheral wall standing upright from four edges of the bottom wall, and having an opening on the upper side; a lid extending to the upper edge of the peripheral wall and covering the opening; With
The peripheral wall includes a pair of first and third side walls facing each other, and a pair of second and fourth side walls facing each other.
The lid body is displaceably provided at an exposed position that exposes the opening, and a cover lid position that extends to the upper edge of each of the first and third side walls and is bent at the upper edge to cover the opening. A pair of cover walls, and a pair of holding pieces that extend to the upper edge of each of the second and fourth side walls and hold the pair of cover walls at the cover position,
Each of the pair of cover walls and each of the pair of holding pieces are each in a rectangular shape, and are provided continuously in an annular shape at the exposed position,
The dimension in the extending direction of the boundary edge between each cover wall and each holding piece extends from both ends of the second and fourth boundary portions corresponding to the boundary between each holding piece and each of the second and fourth side walls. It is formed to be approximately equal to the dimension up to the midpoint,
The boundary edge is overlaid on the second and fourth boundary portions in a state where the cover wall is located at the cover position, and the holding pieces are surfaces of the second and fourth side walls. Is superimposed on
Each of the cover walls has a pair of oblique sides inclined at substantially equal angles from both ends of the first and third boundary portions that contact the boundaries of the first and third sidewalls. Formed to the edge of the installation direction,
The packaging box, wherein each of the cover walls is formed in a mountain shape having the pair of oblique sides as ridge lines in a state where the cover wall is located at the cover position.   The packaging box according to claim 1, wherein either one or both of the pair of cover walls includes a handle wall attached to an edge in the extending direction of the cover wall. A box-shaped main body having a rectangular bottom wall and a peripheral wall standing upright from four edges of the bottom wall, and having an opening on the upper side; a lid extending to the upper edge of the peripheral wall and covering the opening; With
A pair of cover walls extending from the upper edges of the pair of opposed peripheral walls, and covering the opening at the cover position bent at the upper edges, and a pair of peripheral walls facing each other except the pair of peripheral walls A deployment body for producing a packaging box comprising a pair of holding pieces that extend to the upper edge of the pair of holding pieces and hold the pair of cover walls at the cover position,
A sheet is folded at a predetermined position as a crease, and is formed continuously on the peripheral plate constituting the peripheral wall, the bottom plate forming the bottom wall by being continuously formed on the lower edge of the peripheral plate, and the upper edge of the peripheral plate. In the development body of the packaging box formed with the cover plate constituting the lid body,
The surface of the sheet constitutes the outer surface of the packaging box, and the rear surface constitutes the inner surface of the packaging box.
Each of the peripheral plates has a rectangular shape, and includes four side plates that are continuously provided so as to be annular,
Folding the boundary position between the first side plate that hits one of the four side plates and the fourth side plate connected to the first side plate, the back side of the first side plate and the fourth side plate are folded so that they overlap each other.
Folding the boundary position between the second side plate connected to the first side plate and the third side plate connected to the second side plate, the second side plate and the third side plate are folded so that the back surfaces of the second side plate and the third side plate overlap each other.
The cover plate includes a pair of cover plates constituting the pair of cover walls, and a pair of folding plates constituting the pair of holding pieces;
The pair of cover plates are continuously formed on each of the first side plate and the third side plate,
The pair of folding plates are continuously formed on each of the second side plate, the fourth side plate, and the adjacent pair of cover plates,
The first side plate and the second side plate, and the cover plate and the folding plate continuously formed thereon are provided on the same plane,
The third side plate and the fourth side plate, and the cover plate and the folding plate continuously formed thereon are provided on the same plane,
Each folding plate is formed with a pair of isosceles portions inclined at an approximately equal angle upward from both end portions of the second and fourth boundary portions that hit the boundary with the peripheral plate,
Each folding plate has the second and fourth boundary portions and the isosceles portion as folds, and the boundary edge between each cover plate and each folding plate is a fold, and the boundary edge is the second, Folded so as to overlap the fourth boundary portion, the portion surrounded by the second and fourth boundary portions and the pair of isosceles portions is configured to be folded so as to overlap the surface of the peripheral plate,
Each of the cover plates is formed with a pair of oblique sides inclined at an approximately equal angle upward from both end portions of the first and third boundary portions that hit the boundary with the peripheral plate,
An expansion body of a packaging box, wherein each cover plate is configured to be folded in a mountain fold with each oblique side as a crease. Either one or both of the pair of cover plates include a handle plate that extends at the extending direction edge of the cover plate and is bent at the edge,
The packaging cover according to claim 3, wherein the upper end of the pair of oblique sides reaches both ends of the connecting portion between the cover plate and the hander plate. Box expansion body.   The at least one of the pair of cover plates is provided with an extending portion formed to extend in a surface direction between each oblique side and the boundary edge. The expansion | deployment body of the packaging box of Claim 3 or Claim 4.

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