JP2018024451A - Variable box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable box which facilitates a work of changing the volume and enables the repeated changes of the volume.SOLUTION: A variable box 1 in this invention whose volume is changed between first volume and second volume includes: a pair of side surface plates 11 continuously provided to a bottom surface plate 10 through a side surface folding line 20; a pair of end surface plates 12 continuously provided to the bottom surface plate 10 through an end surface folding line 23; and a plurality of fold-in plates 13 continuously provided between the side surface plate 11 and the end surface plate 12 through a corner folding line 26. The side surface plate 11 includes a first side folding line 21 and a second side folding line 22, and the end surface plate 12 includes a first end folding line 24 and a second end folding line 25. The fold-in plate 13 includes a first inclined folding line 28, and the end surface plate 12 includes a second inclined folding line 29. In forming a first shape 1A, the variable box is provided by bending at the first inclined folding line 28, the first side folding line 21, and the first end folding line 24, and in forming a second shape, the variable box is provided by folding at the first inclined folding line 28, the second side folding line 22, the second inclined folding line 29, and the second end folding line 25.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a variable box configured to change its volume.

  In recent years, an increasing number of customers purchase products through mail order sales. Goods are housed in cardboard boxes and are transported by carriers. Generally, the shipping cost of a product increases as the size (volume) of the box increases.

  In order to suppress an increase in the shipping cost, a variable box whose volume can be changed according to the size of the product has been proposed. For example, the variable height box described in Patent Document 1 includes four lid flaps connected to the upper end of the peripheral wall via an upper folding line, a middle folding line formed below the upper folding line, and a middle folding line. And an undulation portion formed upward. The variable height box is configured to be able to select a normal packaging state in which each lid flap is folded along an upper folding line and a low-shrinking packaging state in which the undulating portion and the lid flap are folded along a middle folding line. In the undulating portion, there are formed an end cut line that runs obliquely from both ends of the upper folding line toward the middle folding line, and a corner folding line that runs obliquely from both ends of the middle folding line toward the end cutting line. When changing from a normal packaging state to a low-shrinkage packaging state (volume change), the end cut line is cut, the corner fold line is folded down, and the lid flap is laid inward.

Japanese Patent Laying-Open No. 2015-058945

  However, the above-mentioned variable height box has a problem that it takes time and labor to change the volume because it is necessary to cut the end cutting line in accordance with the volume change. Moreover, since the variable height box which became the low-shrinkage packaging state cut | disconnected the end cut line, it was not able to return to a normal packaging state.

  In order to solve the above-described problems, the present invention provides a variable box for facilitating the volume changing operation and repeatedly performing the volume change.

  In order to achieve the above-described object, the present invention provides a variable box configured to be capable of changing a volume between a first volume and a second volume smaller than the first volume. A pair of side plates connected to both ends in the width direction of the flat plate via side surface folding lines, and a pair of end surface plates connected to the both ends in the length direction intersecting the width direction of the flat plate via end surface folding lines. And a plurality of folding plates connected via a corner fold line between the side surface plate and the end surface plate, and the side surface plate includes an intermediate side fold line formed along the length direction. The end face plate includes an intermediate end fold line formed along the width direction, and the folding plate has an acute angle with respect to the corner fold line on the side face plate side and the corner fold line on the end face plate side. A first extending obliquely outward from an intersection of lines extending the side surface fold line and the end surface fold line, The end face plate includes an oblique fold line, and the end face plate is inclined from the intersection of the intermediate end fold line and the corner fold line toward the tip of the end face plate so as to form an acute angle with respect to the intermediate end fold line and the corner fold line. In the case of forming the first shape having the first volume, including the second inclined fold line extending, the folding plate is provided in a state of being folded at the first inclined fold line and folded inward through the corner fold line. The side plate is provided in a state of being folded inward via the side fold line, and the end face plate is provided in a state of being folded inward via the end surface fold line, and has a second volume. In the case of forming two shapes, the folding plate is provided in a state where the folding plate is folded at the first inclined folding line and folded inward through the corner folding line, and the side plate includes the side folding line and the intermediate folding line. Provided in a state folded inside, and The face plate is provided in a state of being folded inwardly through said intermediate end fold line and said end face fold line is valley-folded at the second inclined fold line.

  In this case, the side plate further includes a tip-side fold line formed along the length direction on the distal end side with respect to the intermediate fold line, and the end surface plate is disposed on the distal end side with respect to the intermediate end fold line. Further comprising a tip end fold line formed along the width direction, and forming the first shape, the side plate is provided in a state of being folded inward via the side fold line and the tip side fold line. And the said end surface board is provided in the state folded inside via the said end surface fold line and the said front part end fold line, and the front end side and the said tip of the said end surface plate rather than the said front part side fold line of the said side plate The front end side with respect to the part end fold line constitutes the first flap to be overlapped, and when forming the second shape, the front end side rather than the intermediate side fold line of the side plate and the intermediate end fold line of the end face plate Further, it is preferable to constitute the second flap to be overlapped with the tip side.

  In this case, the flat plate, the pair of side plates, the pair of end plate and the plurality of folding plates are each composed of corrugated cardboard in which a front liner and a back liner are bonded to both front and back sides of the inner core, The side fold line, the front part side fold line, the intermediate side fold line and the front end fold line are each formed by crushing the corrugated cardboard in the thickness direction from the back liner side, and the end face fold line and the intermediate end fold line, respectively. The corner fold line is formed by intermittently cutting the cardboard in the thickness direction, and the first inclined fold line and the second inclined fold line are respectively formed by cutting the back liner into a line. Preferably it is.

  In this case, the folding plate has a relief hole at a portion where the side surface fold line, the end surface fold line, the intermediate side fold line, the intermediate end fold line, the corner fold line, and the first inclined fold line are concentrated. Is preferred.

  In this case, it is preferable that an angle formed between the first inclined fold line and the corner fold line is set to 45 °, and an angle formed between the second inclined fold line and the intermediate end fold line is set to 45 °.

  In this case, it is preferable that the folding plate includes an auxiliary folding line formed on an extension line of the intermediate end folding line.

  According to the present invention, the volume changing operation can be easily performed. Further, the volume change can be repeated.

It is a perspective view which shows the variable box (1st shape) which concerns on one Embodiment of this invention. It is a perspective view which shows the variable box (2nd shape) which concerns on one Embodiment of this invention. It is a top view which shows the blank of the variable box which concerns on one Embodiment of this invention. It is a perspective view which shows the process (first half) which transforms the variable box which concerns on one Embodiment of this invention to a 1st shape. It is a perspective view which shows the process (latter half) which transforms the variable box which concerns on one Embodiment of this invention to a 1st shape. It is a perspective view which shows the process (first half) which transforms the variable box which concerns on one Embodiment of this invention to a 2nd shape. It is a perspective view which shows the process (latter half) which transforms the variable box which concerns on one Embodiment of this invention to a 2nd shape. It is a top view which shows the blank of the variable box which concerns on the 2nd modification of one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this specification, terms indicating directions and positions (for example, terms including upper, lower, side, end, etc.) are used, but these terms do not limit the technical scope of the present invention.

  With reference to FIG. 1 thru | or FIG. 3, the variable box 1 which concerns on this embodiment is demonstrated. FIG. 1 is a perspective view showing a variable box 1 (first shape 1A). FIG. 2 is a perspective view showing the variable box 1 (second shape 1B). FIG. 3 is a plan view showing the blank 3 of the variable box 1.

  As shown in FIGS. 1 and 2, the variable box 1 is formed in a rectangular parallelepiped shape. The variable box 1 includes a square cylindrical peripheral wall 2 erected on the periphery of a bottom plate (planar plate) 10. The variable box 1 is sealed by closing the upper surface of the peripheral wall 2.

  The variable box 1 is configured to be able to change the dimension in the vertical direction (height direction) according to the size of the contents to be stored. The variable box 1 is configured such that the volume can be changed between a first volume and a second volume smaller than the first volume. In other words, the variable box 1 is configured to be deformable between a first shape 1A having a first volume (see FIG. 1) and a second shape 1B having a second volume (see FIG. 2). . For example, thick contents such as a large number of books are accommodated in the variable box 1 transformed into the first shape 1A. Further, for example, a thin product such as a small number of books is accommodated in the variable box 1 transformed into the second shape 1B.

  As shown in FIG. 3, the variable box 1 is formed by assembling a blank 3 in which a piece of paper cardboard is punched with a paper punching device. The cardboard is, for example, a well-known one in which a front liner 3b (see FIG. 1) and a back liner 3c are bonded to both front and back surfaces of a corrugated shin 3a. FIG. 3 shows the back liner 3c side. In the following description, the direction parallel to the center ridge 3a of the cardboard is referred to as “step direction”, and the direction orthogonal to the step direction is referred to as “flow direction”. “Stage direction” is an example of “width direction” in the claims, and “flow direction” is an example of “length direction” in the claims.

  The blank 3 includes a bottom plate 10, a pair of side plates 11, a pair of end plates 12, and four folding plates 13. The pair of side plates 11 and the pair of end plates 12 mainly constitute the peripheral wall 2 described above.

  The bottom plate 10 is formed in a rectangular shape that is long in the flow direction when viewed from the plane. The pair of side plates 11 and the pair of end plates 12 are alternately arranged on the four sides of the bottom plate 10 and extend outward from the periphery of the bottom plate 10. The bottom plate 10 is not limited to a rectangular shape, and may be formed in a polygonal shape having four or more apexes such as a hexagonal shape and an octagonal shape.

  The pair of side plates 11 are connected to both ends in the step direction of the bottom plate 10 via side fold lines 20. Each side plate 11 is formed in a rectangular shape that is long in the flow direction when viewed from the plane. The dimension of each side plate 11 in the flow direction is formed substantially the same as the dimension of the bottom plate 10 in the flow direction. In addition, since a pair of side surface board 11 is formed in the paper surface of FIG.

  A first side fold line 21 and a second side fold line 22 are formed on the side plate 11 along the flow direction. The first side fold line (front side fold line) 21 is formed in the middle in the step direction of each side plate 11 (at the tip side of the second side fold line 22). The second side fold line (intermediate side fold line) 22 is formed between the first side fold line 21 and the side surface fold line 20. The side fold line 20, the first side fold line 21, and the second side fold line 22 are each formed by squashing the corrugated cardboard in the thickness direction from the back liner 3c side (so-called ruled lines).

  The pair of end face plates 12 are connected to both ends of the bottom face plate 10 in the flow direction via end face folding lines 23. Each end face plate 12 is formed in a substantially rectangular shape that is long in the step direction when seen from the plane. Precisely, each end face plate 12 is formed in a substantially hexagonal shape by cutting both corners in the step direction on the front end side when viewed from the plane. The dimension in the step direction of each end face plate 12 is formed substantially the same as the dimension in the step direction of the bottom plate 10. In addition, since a pair of end surface board 12 is formed left-right symmetrically in the paper surface of FIG. 3, only one end surface board 12 is demonstrated below.

  A first end fold line 24 and a second end fold line 25 are formed on the end face plate 12 along the width direction. The first end fold line (front end fold line) 24 is formed on the outer side in the flow direction of each end face plate 12 (on the tip side with respect to the second end fold line 25). The second end fold line (intermediate end fold line) 25 is formed between the first end fold line 24 and the end face fold line 23. The first end fold line 24 is a so-called ruled line. The end surface fold line 23 and the second end fold line 25 are each formed by intermittently cutting a cardboard in the thickness direction (so-called sewing machine blade lines).

  The four folding plates 13 are connected to each other between the side plate 11 and the end plate 12 via a corner fold line 26. Each folding plate 13 is formed in a substantially pentagonal shape in a range connecting the corner portion of the bottom plate 10, the end portion of the first side folding line 21, and the end portion of the first end folding line 24 when viewed from the plane. In addition, since the four folding plates 13 are formed symmetrically vertically and horizontally on the paper surface of FIG. 3, only one folding plate 13 will be described below.

  The folding plate 13 is connected to the side plate 11 and the end plate 12 through two orthogonal corner fold lines 26. Each corner fold line 26 is a so-called sewing machine blade line. A corner fold line 26 between the folding plate 13 and the side plate 11 is formed on an extension line of the end surface fold line 23. A corner fold line 26 between the folding plate 13 and the end face plate 12 is formed on an extension line of the side fold line 20. An auxiliary folding line 27 is formed in the folding plate 13 along the step direction. The auxiliary folding line 27 is a so-called ruled line, and is formed on an extension line of the second end folding line 25.

  Further, the first folding line 28 is formed obliquely on the folding plate 13. The first inclined fold line 28 is formed by cutting the back liner 3c into a linear shape (so-called liner cut). The first inclined fold line 28 is an intersection of the side fold line 20 and the end face fold line 23 (or each fold line 20, so as to form an acute angle with respect to the corner fold line 26 on the side face plate 11 side and the corner fold line 26 on the end face plate 12 side. It extends diagonally outward from the intersection of the extension lines 23 (see the triangle in FIG. 3). In other words, the first inclined fold line 28 connects from the intersection of the side fold line 20 and the end face fold line 23 to the intersection of the lines extending from the first side fold line 21 and the first end fold line 24 (see the rectangle in FIG. 3). It extends diagonally along the line. That is, the first inclined folding line 28 extends obliquely from the corner of the bottom plate 10 so as to bisect the folding plate 13. The angle formed between the first inclined fold line 28 and the corner fold line 26 is set to approximately 45 °.

  A pair of second inclined folding lines 29 are formed obliquely on the end face plate 12 described above. Each second inclined fold line 29 is a so-called liner cut. Each second inclined fold line 29 is formed from the intersection of the second end fold line 25 and the corner fold line 26 so as to form an acute angle with respect to the second end fold line 25 and the corner fold line 26 (first end fold line). It extends obliquely towards 24). That is, the pair of second inclined folding lines 29 are inclined so as to approach each other from the end of the second end folding line 25 toward the outside in the flow direction. The angle formed between each second inclined fold line 29 and the second end fold line 25 (corner fold line 26) is set to approximately 45 °. That is, the angle formed by the adjacent first inclined fold line 28 and second inclined fold line 29 is set to approximately 90 °. In addition, the base end part of each 2nd inclined folding line 29 is bent at a substantially right angle toward the folding plate 13 side, and extends slightly to the folding plate 13 side.

  A relief hole 30 is formed in the folding plate 13 described above. The escape hole 30 opens in a range surrounded by a line obtained by extending the second side fold line 22, two corner fold lines 26, and an auxiliary fold line 27. That is, the escape hole 30 is formed in a portion where the side surface folding line 20, the end surface folding line 23, the second side folding line 22, the second end folding line 25, the two corner folding lines 26, and the first inclined folding line 28 are concentrated.

  The escape hole 30 has a plurality of curved portions 31 formed in a substantially semicircular shape. Ends of the respective folding lines 20, 22, 23, 25, 26, 28 are connected to the bending portion 31 and opened to the escape holes 30. In other words, the side fold line 20, the second side fold line 22, and the corner fold line 26 on the end face plate 12 side are extended in the flow direction with the escape hole 30 as a base point. The end surface fold line 23, the second end fold line 25, and the corner fold line 26 on the side plate 11 side are extended in the step direction with the escape hole 30 as a base point. The first inclined fold line 28 extends obliquely with the escape hole 30 as a base point.

  Next, the operation of the variable box 1 will be described with reference to FIGS. FIG. 4 is a perspective view showing a process (first half) of deforming the variable box 1 into the first shape 1A. FIG. 5 is a perspective view showing a process (second half) of deforming the variable box 1 into the first shape 1A. FIG. 6 is a perspective view showing a process (first half) of deforming the variable box 1 into the second shape 1B. FIG. 7 is a perspective view showing a process (second half) of deforming the variable box 1 into the second shape 1B. For convenience of explanation, it is assumed that the contents are placed on the bottom plate 10 of the blank 3 with the back liner 3c facing upward.

  A procedure (assembly procedure) in which the variable box 1 configures the first shape 1A will be described. First, as shown in FIG. 4, the operator bends the pair of end face plates 12 along the end face fold line 23 at a substantially right angle. The pair of end face plates 12 face each other with the bottom plate 10 interposed therebetween, and are erected on both sides of the bottom plate 10 in the flow direction.

  Subsequently, the operator bends one side plate 11 along the side fold line 20 at a substantially right angle. At this time, the operator bends the side plate 11 while folding the pair of folding plates 13 connected to the side plate 11 inward. Each folding plate 13 is folded by folding the two corner fold lines 26 in a mountain and by folding the first inclined fold lines 28 in a valley. In a state where each folding plate 13 is folded inward, one side plate 11 is erected on one side in the step direction of the bottom plate 10 (see FIG. 5).

  Next, as shown in FIG. 5, the operator bends the pair of end face plates 12 inward along the first end fold line 24 at a substantially right angle. When the first shape 1A is formed, the front end side (free end side) of the end face plate 12 with respect to the first end fold line 24 is set as an inner flap (first flap) 40.

  Subsequently, the worker bends the one side plate 11 inward along the first side folding line 21 at a substantially right angle. In the case of forming the first shape 1 </ b> A, the front end side of the side plate 11 with respect to the first side folding line 21 is set as an outer flap (first flap) 41. One outer flap 41 is superimposed on the upper side of the inner flap 40.

  Next, the operator bends the other side plate 11 at the side fold line 20 while folding each folding plate 13 inward in the same procedure as described above. The operator bends the other side plate 11 along the first side folding line 21 to form the outer flap 41. The other outer flap 41 is overlapped on the inner flap 40 and is brought into contact with one outer flap 41 at the center (see FIG. 1). The variable box 1 is sealed by sticking a tape or the like to the abutting portion of the pair of outer flaps 41. Each outer flap 41 may be attached to the inner flap 40.

  Thus, the variable box 1 having the first shape 1A is assembled (see FIG. 1). In the case of constituting the first shape 1A, the second side fold line 22, the second end fold line 25, and the second inclined fold line 29 are not used.

  Next, the procedure in which the variable box 1 configures the second shape 1B will be described. In the following description, the same procedure as that of the first shape 1A described above is omitted or simplified.

  As shown in FIG. 6, the operator bends the pair of end face plates 12 along the end face fold line 23 at a substantially right angle. Subsequently, the operator bends the one side plate 11 along the side fold line 20 at a substantially right angle while folding the pair of folding plates 13 inward.

  Next, the operator bends the pair of end face plates 12 along the second end fold line 25 at a substantially right angle while folding the second inclined fold line 29 located on one side. When forming 2nd shape 1B, the front end side (free end side) rather than the 2nd end fold line 25 of each end surface board 12 is set as the inner flap (2nd flap) 50. FIG. In this state, each folding plate 13 connected to the other side plate 11 is bent at a substantially right angle inside by an auxiliary folding line 27.

  Subsequently, as shown in FIG. 7, the worker bends one side plate 11 inward along the second side folding line 22 at a substantially right angle. At this time, each folding plate 13 connected to one side plate 11 is folded over at the valley-folded portion of the end plate 12 (see FIG. 6). When forming 2nd shape 1B, the front end side rather than the 2nd side folding line 22 of the side surface board 11 is set as the outer flap (2nd flap) 51. As shown in FIG. One outer flap 51 is superimposed on the upper side of the inner flap 50.

  Next, the operator bends the other side plate 11 at the side fold line 20 while folding each folding plate 13 inward in the same procedure as described above. An operator forms the outer flap 51 by folding the other side plate 11 along the second side folding line 22 while valley-folding the pair of second inclined folding lines 29. The other outer flap 51 is overlapped on the inner flap 50 and is also overlapped on the one outer flap 51 (see FIG. 2). The variable box 1 is sealed by attaching the other outer flap 51 to the one outer flap 51. Each outer flap 51 may be attached to the inner flap 50.

  The variable box 1 which comprises the 2nd shape 1B is assembled by the above (refer FIG. 2). In addition, when comprising the 2nd shape 1B, the 1st side fold line 21 and the 1st end fold line 24 are not used.

  In the description of the above assembly procedure, the contents are placed on the bottom plate 10 of the blank 3 before assembly, but the present invention is not limited to this. The contents may be stored in the variable box 1 at any timing before the variable box 1 is sealed. For example, in the process of deforming the variable box 1 into the second shape 1 </ b> B, one side plate 11 is bent at the second side folding line 22, and one outer flap 51 is attached to the inner flap 50. In this state, the other side plate 11 is not folded, and each other folding plate 13 is bent at an auxiliary folding line 27 (see FIG. 7). The contents can be inserted into the variable box 1 during the formation of the second shape 1B from the other side.

  As described above, when the first shape 1A is formed, the folding plate 13 is provided in a state in which the folding plate 13 is valley-folded at the first inclined folding line 28 and is folded inward via the corner folding line 26, and the side plate 11 is provided with the side folding line. 20 and the first side folding line 21 are provided in a state of being folded inside, and the end face plate 12 is provided in a state of being folded inward via an end face folding line 23 and a first end folding line 24 ( FIG. 4 and FIG. 5). On the other hand, when the second shape 1B is formed, the folding plate 13 is provided in a state where the folding plate 13 is folded at the first inclined folding line 28 and is folded inward via the corner folding line 26, and the side plate 11 is connected to the side folding line 20 and the second folding line 20. The end face plate 12 is provided in a state of being folded inside via the side fold line 22, and the end face plate 12 is folded at the second inclined fold line 29 and folded inside via the end face fold line 23 and the second end fold line 25. (See FIGS. 6 and 7).

  According to the variable box 1 according to the present embodiment described above, the variable box 1 can be divided into two different sizes (only by folding the plates 11 to 13 with reference to the fold line selected from the plurality of fold lines 20 to 29). Shape). Since it is not necessary to cut the broken lines 20 to 29 when the variable box 1 is deformed (when the volume is changed), it is possible to easily change the volume. Moreover, since each fold line 20-29 only bends, for example, after changing the variable box 1 which comprised 1st shape 1A to 2nd shape 1B, it can also return to 1st shape 1A again. That is, the volume change of the variable box 1 can be repeated.

  Moreover, according to the variable box 1 which concerns on this embodiment, the magnitude | size (length) of the inner flaps 40 and 50 and the outer flaps 41 and 51 can be changed according to the shape (size) of the variable box 1 ( FIG. 5 and FIG. 7). Thereby, the variable box 1 can be sealed appropriately.

  Moreover, according to the variable box 1 which concerns on this embodiment, the relief hole 30 is drilled in the part where each folding line 20, 22, 23, 25, 26, 28 concentrates (refer FIG. 3). Thereby, it is prevented that each folding line 20, 22, 23, 25, 26, 28 concentrates on one point, and the side plate 11, the end surface plate 12, and the folding plate 13 are connected to each folding line 20, 22, 23, 25, 26, 28 can be easily bent. In addition, it is possible to suppress the breakage of the portion where the broken lines 20, 22, 23, 25, 26, and 28 are concentrated.

  In addition, when the variable box 1 which concerns on this embodiment comprised the 1st shape 1A, although the inner flap 40 and the outer flap 41 were formed, this invention is not limited to this. Although illustration is omitted, the flaps 40 and 41 may be omitted from the variable box according to the first modification. That is, the side surface plate 11 may not be bent at the first side folding line 21, and the end surface plate 12 may not be bent at the first end folding line 24. In other words, the side surface plate 11 is provided in a state of being folded inward via the side surface folding line 20, and the end surface plate 12 is provided in a state of being folded inward via the end surface folding line 23. Then, the variable box which forms the first shape is formed in a tray shape having an open upper surface. Thus, when forming the variable box which abbreviate | omitted each flap 40 and 41, you may abbreviate | omit the 1st side fold line 21 and the 1st end fold line 24. FIG.

  In addition, although the variable box 1 which concerns on this embodiment was provided with the four folding plates 13, this invention is not limited to this. For example, as shown in FIG. 8, the variable box 60 (blank 61) according to the second modification includes two folding plates 13 between one side plate 11 and each end plate 12, and each end plate. 12 is provided with a side flap 62 which is connected to the other end of 12 via a corner fold line 26. That is, a side flap 62 is formed in place of the folding plate 13. Each side flap 62 includes a first side flap 63 and a second side flap 64. The first side surface flap 63 is formed with substantially the same width as the interval between the first end fold line 24 and the second end fold line 25. The second side surface flap 64 is formed with substantially the same width as the distance between the end surface fold line 23 and the second end fold line 25. The first side surface flap 63 is formed longer in the step direction than the second side surface flap 64. A ruled line 65 is formed between the first side flap 63 and the second side flap 64. When the first shape 1A is formed, the first and second side surface flaps 63 and 64 are bent inward at the corner fold line 26. When the second shape 1B is formed, the first side surface flap 63 is bent at the ruled line 65, and the second side surface flap 64 is bent at the corner folding line 26 inward. At this time, the front end side of the first side surface flap 63 may be folded inward so as to overlap the second side surface flap 64. In the variable box 60 according to the second modification, the other second inclined folding line 29 of each end face plate 12 may be omitted.

  In addition, the variable boxes 1 and 60 according to the present embodiment (including each modification example, the same applies hereinafter) include a first inclined fold line 28 and a second inclined fold line 29 having an inclination angle of 45 ° with respect to the corner fold line 26. However, the present invention is not limited to this. You may change the said inclination angle according to the position etc. of each inclination folding line 28,29.

  In the variable boxes 1 and 60 according to the present embodiment, the side fold line 20, the first side fold line 21, the second side fold line 22, the first end fold line 24, and the auxiliary fold line 27 are ruled lines, but the present invention is not limited thereto. Alternatively, a sewing machine blade line or a liner cut may be used. Moreover, although the end surface fold line 23, the 2nd end fold line 25, and the corner fold line 26 were sewing machine blade lines, it is not restricted to this, A ruled line may be sufficient and a liner cut may be sufficient. Furthermore, although the 1st inclination fold line 28 and the 2nd inclination fold line 29 were liner cuts, it is not restricted to this, A ruled line may be sufficient and a sewing machine blade line may be sufficient.

  In addition, although the variable boxes 1 and 60 which concern on this embodiment were formed with the paper cardboard as an example, this invention is not limited to this. For example, instead of paper cardboard, resin cardboard may be used, or a single cardboard or resin sheet may be used.

  In addition, description of the said embodiment shows the one aspect | mode in the variable box which concerns on this invention, Comprising: The technical scope of this invention is not limited to the said embodiment. The components in the above embodiment can be appropriately replaced or combined with existing components and the like, and the description of the above embodiment does not limit the content of the invention described in the claims. .

1,60 Variable box 1A 1st shape 1B 2nd shape 3a Middle shin 3b Front liner 3c Back liner 10 Bottom plate (flat plate)
DESCRIPTION OF SYMBOLS 11 Side plate 12 End surface plate 13 Folding plate 20 Side surface broken line 21 1st side broken line (front part side broken line)
22 Second side fold line (intermediate side fold line)
23 End face fold line 24 First end fold line (front end fold line)
25 Second end fold line (intermediate end fold line)
26 Corner fold line 27 Auxiliary fold line 28 First inclined fold line 29 Second inclined fold line 30 Relief hole 40 Inner flap (first flap)
41 Outside flap (first flap)
50 Inner flap (second flap)
51 Outside flap (second flap)

Claims (6)

A variable box (1) configured to be capable of changing a volume between a first volume and a second volume smaller than the first volume,
A plane plate (10);
A pair of side plates (11) connected to both ends in the width direction of the flat plate via side fold lines (20);
A pair of end face plates (12) connected to both ends in the length direction intersecting the width direction of the flat plate via end face folding lines (23);
A plurality of folding plates (13) provided between the side plate and the end plate via a corner fold line (26),
The side plate includes an intermediate folding line (22) formed along the length direction,
The end face plate includes an intermediate end fold line (25) formed along the width direction,
The folding plate is directed outward from an intersection of lines extending the side surface folding line and the end surface folding line so as to form an acute angle with respect to the corner folding line on the side surface plate side and the corner folding line on the end surface plate side. Including a first inclined fold line (28) extending obliquely,
The end face plate is a second inclined fold line extending obliquely from the intersection of the intermediate end fold line and the corner fold line toward the tip of the end face plate so as to form an acute angle with the intermediate end fold line and the corner fold line. (29)
When forming the first shape (1A) having the first volume, the folding plate is provided in a state where the folding plate is folded at the first inclined folding line and folded inward through the corner folding line, Provided in a state folded inward via the side surface fold line, and the end face plate is provided in a state folded inward via the end face fold line,
When forming the second shape (1B) having the second volume, the folding plate is provided in a state where the folding plate is folded at the first inclined folding line and folded inward through the corner folding line, It is provided in a state of being folded inward via the side fold line and the intermediate side fold line, and the end face plate is valley-folded by the second inclined fold line, and through the end face fold line and the intermediate end fold line. A variable box that is provided in a state of being folded inside. The side plate further includes a tip side fold line (21) formed along the length direction on the tip side of the intermediate fold line,
The end face plate further includes a tip end fold line (24) formed along the width direction on the tip side of the intermediate end fold line,
In the case of forming the first shape, the side plate is provided in a state of being folded inward via the side fold line and the tip side fold line, and the end plate is the end face fold line and the tip end fold line. 1st flap which is provided in the state where it was folded inside via the tip side, and the tip side rather than the tip part side fold line of the side plate overlaps the tip side than the tip part end fold line of the end face plate (40, 41)
In the case of forming the second shape, the distal end side of the side surface plate with respect to the intermediate folding line and the distal end side of the end surface plate with respect to the intermediate end folding line constitute a second flap (50, 51) to be overlapped. The variable box according to claim 1. The flat plate, the pair of side plates, the pair of end plates, and the plurality of folding plates are respectively bonded with a front liner (3b) and a back liner (3c) on both front and back sides of the inner shin (3a). Consists of cardboard,
The side fold line, the front part side fold line, the intermediate side fold line and the front end fold line are each formed by crushing the corrugated cardboard in a thickness direction from the back liner side,
The end surface fold line, the intermediate end fold line and the corner fold line are each formed by intermittently cutting the cardboard in the thickness direction,
The variable box according to claim 2, wherein each of the first inclined fold line and the second inclined fold line is formed by cutting the back liner into a linear shape.   The folding plate is provided with a relief hole (30) in a portion where the side surface fold line, the end surface fold line, the intermediate side fold line, the intermediate end fold line, the corner fold line and the first inclined fold line are concentrated. The variable box according to any one of claims 1 to 3. An angle formed between the first inclined fold line and the corner fold line is set to 45 °,
The variable box according to any one of claims 1 to 4, wherein an angle formed by the second inclined fold line and the intermediate end fold line is set to 45 °.   The variable box according to any one of claims 1 to 5, wherein the folding plate includes an auxiliary folding line (27) formed on an extension line of the intermediate end folding line.

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