JP2019214401A - Variable capacity box - Google Patents

Abstract

To provide a variable capacity box which is easy to operate when changing the capacity, and unlikely to deform.SOLUTION: Each ridge line part connecting a front-rear pair of end walls 11,12 and a pair of left- right side walls 13, 14 is constituted by rule marks L1 - L4. On each of the end walls 11,12 are respectively formed a pair of left and right end wall cutting guide lines 41 and a pair of left and right end wall bent guide lines 51. Each of the end wall cutting guide lines 41 has its starting point at one end of the rule marks L1 - L4, and extends obliquely downward toward the center part of the left-right direction of the end walls 11, 12, and each of the end wall bent guide lines 51 has its starting point at the rule marks L1 to L4 and extends obliquely upward toward the end wall cutting guide line 41.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a variable capacity box capable of changing the internal capacity.

Conventionally, as this kind of variable capacity box, one described in Patent Literature 1 is known.
The variable capacity box of Patent Literature 1 includes a second fold line provided at a position on a side surface that is separated by a predetermined distance from a first fold line that is a boundary position between the side surface and the top surface, and has a structure in which each side plate is provided. A cuttable line extending in the vertical direction is provided on each boundary line.

  In this variable capacity box, the boundary position between the side surface and the top surface can be set to the first fold line or the second fold line, and the capacity of the box can be changed by changing the height of the side surface in multiple stages. it can.

JP 2014-125237 A

  In the variable capacity box of Patent Literature 1, for example, when the capacity of the box is changed to be small, it is necessary to cut the cuttable lines on the respective ridges of the side plates to a position where the desired capacity is obtained. It is. Therefore, the operation of changing the capacity is complicated. In addition, if an unintended break occurs in the cuttable line, the box may be deformed.

  An object of the present invention is to solve the above-mentioned problems and to provide a variable capacity box in which the operation for changing the capacity is easy and the box is hardly deformed.

  In order to solve the above problems, a variable capacity box according to the present invention includes a body portion including a pair of front and rear end walls and a pair of left and right side walls, a bottom wall closing a lower opening of the body portion, And a top wall closing the upper opening of the part. Each ridge connecting the pair of front and rear end walls and the pair of left and right side walls is formed of a ruled line. On each of the end walls, a pair of left and right end wall cutting guide lines and a pair of left and right end wall bending guide lines are formed. Each of the end wall cutting guide lines extends obliquely downward from the one end of the ruled line toward the center in the left-right direction of the end wall. Each of the end wall bending guide lines extends obliquely upward from the ruled line toward the end wall cutting guide line.

  In the present invention, when the capacity of the box is changed, cuts are made in both end walls along each end wall cutting guide line, and the both end walls are bent between the cuts. Then, both side walls are bent while bending both end walls along the end wall bending guide line. Thereby, the capacity of the box can be changed. In this case, each of the end wall cutting guide lines and each of the end wall bending guide lines extend toward the center of the end wall in the left-right direction. Therefore, both end walls and both side walls can be bent without providing a conventional severable line on the ridge line portion. For this reason, the strength of each ridge is ensured, and the box is hardly deformed. Further, when bending both side walls while bending both end walls, a portion left uncut on the ridge line side along each end wall cutting guide line can be folded along each end wall bending guide line. This makes it possible to reinforce the vicinity of the ridge. Therefore, the box is hardly deformed.

  Further, it is preferable that the end wall cutting guide line is formed in a stepwise shape toward a central portion of the end wall in the left-right direction. By making the end wall cutting guide line step-like, it is easy to specify the bending position of both end walls, and operability when changing the capacity of the box is improved.

  Further, it is preferable that the end wall cutting guide line has a shape formed by connecting a plurality of arcs. In this configuration, a notch can be easily formed in the end wall by pressing the finger along the arc. This facilitates the bending operation of the end wall.

  Further, it is preferable that a rounded cut portion is formed at a lower end portion of the arc of the end wall cutting guide line. When the finger is pressed along the arc, it is possible to prevent the lower end of the arc from tearing.

Further, it is preferable that each of the ridge portions is composed of the ruled line and a slit continuous with one end of the ruled line. With this configuration, the end wall and the side wall can be bent using the slit or the ruled line. In the case of bending at the slit, the boundary between the end wall and the side wall is separated by the slit, so that the complicated operation using a severable line as in the related art is not required, and the end wall and the side wall can be easily formed. Can be folded. Therefore, the operation for changing the capacity is easy.
Further, since a cuttable line on the ridgeline portion is not required as in the related art, the strength is improved and the box is hardly deformed.

It is preferable that bent guide lines extending in the left-right direction are formed on the both end walls, and bent guide lines extending in the front-rear direction are formed on the both side walls.
In this configuration, both end walls and both side walls can be bent along the two bending guide lines, so that the operability when changing the capacity of the box is excellent.

  ADVANTAGE OF THE INVENTION According to this invention, the operation | movement at the time of changing a capacity | capacitance is easy, and the capacity | capacitance variable box which a deformation | transformation of a box hardly produces is obtained.

It is the perspective view which looked at the variable capacity box concerning a 1st embodiment of the present invention from the front upper right. It is a figure showing the blank sheet of the variable capacity box concerning a 1st embodiment of the present invention, and is the top view arranged so that the outer surface side could be seen. It is a figure showing a blank sheet of a variable capacity box concerning a 1st embodiment of the present invention, and is a top view arranged so that an inner side may be seen. FIG. 2 is an enlarged front view of the variable capacity box according to the first embodiment of the present invention. It is an explanatory view in the case of forming the variable capacity box according to the first embodiment of the present invention. It is an explanatory view in the case of forming the variable capacity box according to the first embodiment of the present invention with the maximum capacity. FIG. 4 is an explanatory diagram in a case where the variable capacity box according to the first embodiment of the present invention is formed with a capacity bent at a boundary between a ruled line and a slit. It is the perspective view which formed the capacity variable box concerning a 1st embodiment of the present invention with the capacity bent at the boundary of a ruled line and a slit. It is explanatory drawing in the case of forming the variable capacity box which concerns on 1st Embodiment of this invention with the capacity | capacitance bent at the 2nd step from the end wall cutting | disconnection guide wire. It is explanatory drawing in the case of forming the variable capacity box which concerns on 1st Embodiment of this invention with the capacity | capacitance bent at the 2nd step from the end wall cutting | disconnection guide wire. It is the perspective view which formed the capacity variable box concerning a 1st embodiment of the present invention with the capacity bent at the 2nd step from the end wall cutting guidance line. FIG. 4 is an explanatory diagram in a case where the variable capacity box according to the first embodiment of the present invention is formed with a minimum capacity. FIG. 4 is an explanatory diagram in a case where the variable capacity box according to the first embodiment of the present invention is formed with a minimum capacity. It is the perspective view which formed the variable capacity box concerning a 1st embodiment of the present invention with the minimum capacity. It is the perspective view which looked at the variable capacity box concerning a 2nd embodiment of the present invention from the front upper right. It is a figure showing a blank sheet of a variable capacity box concerning a 2nd embodiment of the present invention, and is a top view arranged so that an outer surface side can be seen. It is a figure showing a blank sheet of a variable capacity box concerning a 2nd embodiment of the present invention, and is a top view arranged so that an inner side may be seen.

An embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In each embodiment, the same portions are denoted by the same reference numerals, and overlapping description will be omitted.
In the following description, the front, rear, left, right, up and down directions are set for convenience in describing the variable capacity box, and do not limit the configuration of the variable capacity box.

(First embodiment)
As shown in FIG. 1, a variable capacity box 1 (hereinafter, may be simply referred to as “box 1”) includes a body portion 10 including a pair of front and rear end walls 11 and 12 and a pair of left and right side walls 13 and 14; It has a bottom wall 20 closing the lower opening of the part 10 and a top wall 30 closing the upper opening of the body 10.

As shown in FIGS. 2A and 2B, the box 1 is formed by folding a blank sheet S obtained by cutting out one sheet made of corrugated cardboard into mountain lines or valleys at each ruled line. The blank sheet S shown in FIG. 2A is arranged so that the inner surface side can be seen. The blank sheet S shown in FIG. 2B is arranged so that the outer surface side can be seen.
As shown in FIG. 2B, each ruled line (folded line) that partitions the end walls 11 and 12, the side walls 13 and 14, the bottom wall 20 (see FIG. 1), and the top wall 30 (see FIG. 1) of the blank sheet S is a blank sheet. It is a linear groove formed by pushing the inner surface of S.
A cut (half-cut line or the like) may be formed in the ruled line. This makes it easier to fold the blank sheet S at the ruled line.

The front end wall 11 is formed in a square as shown in FIG. 1 (see FIGS. 2A and 2B).
A left side wall 13 is connected to the left edge of the front end wall 11 via a ruled line L1 (see FIGS. 2A and 2B).
The left side wall 13 extends rearward from the left edge of the front end wall 11. The left side wall 13 is formed at right angles to the front end wall 11. The left side wall 13 is formed in a square shape.

  The ridge (corner) between the front end wall 11 and the left side wall 13 is composed of a ruled line L1 and a slit ST1 continuous with the upper end (one end) of the ruled line L1. The front end wall 11 and the left side wall 13 are continuous at the ruled line L1, and are discontinuous at the slit ST1.

The rear end wall 12 is connected to the rear edge of the left side wall 13 via a ruled line L2 (see FIGS. 2A and 2B).
The rear end wall 12 extends rightward from the rear edge of the left side wall 13. The rear end wall 12 is formed at right angles to the left side wall 13. The rear end wall 12 has the same shape as the front end wall 11.

  The ridge (corner) between the left side wall 13 and the rear end wall 12 is composed of a ruled line L2 and a slit ST2 continuous with the upper end (one end) of the ruled line L2. The left side wall 13 and the rear end wall 12 are continuous at the ruled line L2, and are discontinuous at the slit ST2.

A joining piece 15 is continuously provided on the right edge of the rear end wall 12 via a ruled line L3 (see FIGS. 2A and 2B). The joining piece 15 is formed in a band shape along the right edge of the rear end wall 12.
The joining piece 15 is a portion that is joined to the rear end of the inner surface of the right side wall 14 with an adhesive.

A right side wall 14 is connected to the right edge of the front end wall 11 via a ruled line L4 (see FIGS. 2A and 2B).
The right side wall 14 extends rearward from the right edge of the front end wall 11. The right side wall 14 is formed at right angles to the front end wall 11. The right side wall 14 has the same shape as the left side wall 13.

  The ridge (corner) between the front end wall 11 and the right side wall 14 is composed of a ruled line L4 and a slit ST4 continuous with the upper end (one end) of the ruled line L4. The front end wall 11 and the right side wall 14 are continuous at the ruled line L4, and are discontinuous at the slit ST4.

  The ridge (corner) between the right side wall 14 and the rear end wall 12 is composed of a ruled line L3 and a slit ST3 continuous with the upper end (one end) of the ruled line L3. The right side wall 14 and the rear end wall 12 are continuous at the ruled line L3, and are discontinuous at the slit ST3. Note that the slit ST3 is formed by connecting the rear end wall 12 and the right side wall 14 via the joining piece 15.

  On the inner surfaces of the front end wall 11, the rear end wall 12, the left side wall 13, and the right side wall 14, as shown in FIG. 2B, a plurality of parallel bending guide lines 16 extending in the longitudinal direction of each wall are formed. The bending guide lines 16 are formed at equal intervals in the short direction of the flap. Some of the plurality of bending guide lines 16 are formed corresponding to the step portions of the stepped end wall cutting guide lines 41 described later.

  By bending the blank sheet S (see FIGS. 2A and 2B) at the ruled lines L1 to L4 and joining the joining pieces 15 to the rear inner surface of the right side wall 14, the front end wall 11, the left side wall 13, and the rear end The wall 12 and the right side wall 14 form a square tubular body 10 (see FIG. 1).

As shown in FIGS. 2A and 2B, the bottom wall 20 includes front and rear bottom inner flaps 21 and 21 and left and right bottom outer flaps 22 and 22. The front and rear bottom inner flaps 21 and 21 are connected to lower edges of the front and rear end walls 11 and 12 via ruled lines L5 and L6. The left and right bottom outer flaps 22, 22 are connected to lower edges of the left and right side walls 13, 14 via ruled lines L7, L8.
As shown in FIG. 1, a bottom wall 20 is formed by placing a pair of left and right bottom outer flaps 22, 22 on the lower side of a pair of front and rear bottom inner flaps 21, 21. The inner bottom flaps 21, 21 and the outer bottom flaps 22, 22 are joined by an adhesive or the like.

The upper opening of the body 10 is closed by a top wall 30 as shown in FIG. The top wall 30 includes a pair of front and rear inner flaps 31, 31 and a pair of left and right outer flaps 32, 32.
As shown in FIGS. 2A and 2B, the inner flap 31 on the front side is connected to the upper edge of the front end wall 11 via a ruled line L9. As shown in FIG. 1, the front inner flap 31 extends rearward from the upper edge of the front end wall 11. The front inner flap 31 is formed at right angles to the front end wall 11.

  The rear inner flap 31 is connected to the upper edge of the rear end wall 12 via a ruled line L10. As shown in FIG. 1, the rear inner flap 31 extends forward from the upper edge of the rear end wall 12. The rear inner flap 31 is formed at right angles to the rear end wall 12.

  As shown in FIGS. 2A and 2B, the outer flap 32 on the left side is connected to the upper edge of the left side wall 13 via a ruled line L11. The outer flap 32 on the left side extends rightward from the upper edge of the left side wall 13 as shown in FIG. The left outer flap 32 is formed at right angles to the left side wall 13.

  As shown in FIGS. 2A and 2B, the outer flap 32 on the right side is connected to the upper edge of the right side wall 14 via a ruled line L12. The right outer flap 32 extends from the upper edge of the right side wall 14 to the left as shown in FIG. The right outer flap 32 is formed at right angles to the right side wall 14.

  As shown in FIG. 2B, a plurality of parallel bending guide lines 33 extending in the longitudinal direction of the flap 31 are formed on the inner surfaces of the pair of front and rear inner flaps 31, 31 and the pair of left and right outer flaps 32, 32. The bending guide lines 33 are formed at equal intervals in the short direction of the flap 31. In the present embodiment, the bending guide lines 33 are arranged at the same intervals as the above-described bending guide lines 16.

  As shown in FIGS. 2A and 2B, a pair of left and right end wall cutting guide lines 41, 41 and a pair of left and right end wall bending guide lines 51, 51 are formed on the front end wall 11 and the rear end wall 12. . The pair of left and right end wall cutting guide lines 41, 41 and the pair of left and right end wall bent guide lines 51, 51 have the same configuration in the front end wall 11 and the rear end wall 12, and are hereinafter formed on the front end wall 11. What is formed will be described, and what is formed on the rear end wall 12 will be described as appropriate.

  As shown in FIG. 3, the pair of left and right end wall cutting guide lines 41, 41 and the pair of left and right end wall bent guide lines 51, 51 are line-symmetric about a reference line X1 that bisects the front end wall 11 in the left-right direction. Is formed. Each of the end wall cutting guide lines 41 and the end wall bending guide lines 51 is formed by a perforated cut line. Note that the end wall bending guide line 51 may be formed by a half-cut line or the like.

The left end wall cutting guide line 41 extends diagonally downward from the upper end L1a of the ruled line L1 toward the center of the front end wall 11 in the left-right direction. On the other hand, the right end wall cutting guide line 41 extends diagonally downward from the upper end L4a of the ruled line L4 toward the center of the front end wall 11 in the left-right direction.
Each of the end wall cutting guide lines 41 is formed in a stepped shape in which three arcs 41 a to 41 c are connected toward a central portion of the front end wall 11 in the left-right direction. At the lower end of each of the arcs 41a to 41c, an R-shaped (circular concave) cut portion 43 that curves downward is formed.

  The inclination angle of each end wall cutting guide line 41 is such that when a common tangent line (not shown) in contact with the bulging end of each of the arcs 41a to 41c is drawn, the tangent line is 45 degrees with respect to the ruled lines L1 and L4. The angle is set.

The left end wall bending guide line 51 extends obliquely upward toward the center in the left-right direction of the front end wall 11 with the ruled line L1 as a starting point. On the other hand, the right end wall bending guide line 51 extends obliquely upward toward the center of the front end wall 11 in the left-right direction with the ruled line L4 as a starting point.
Each end wall bending guide line 51 is composed of three parallel guide lines 51a to 51c in the vertical direction. The guide wires 51a to 51c are formed at equal intervals. The upper guide line 51a extends toward the bulging end of the upper arc 41a of the end wall cutting guide line 41. The central guide line 51b extends toward the lower end of the upper arc 41a of the end wall cutting guide line 41 (the boundary between the upper arc 41a and the central arc 41b). The lower guide wire 51c extends toward the bulging end of the central arc 41b of the end wall cutting guide wire 41. Each end wall bending guide line 51 is orthogonal to a common tangent line (not shown) that is in contact with the bulging end of each of the arcs 41a to 41c of each end wall cutting guide line 41.

  As shown in FIG. 2A, in the rear end wall 12, the left end wall cutting guide line 41 extends obliquely downward toward the center in the left-right direction of the rear end wall 12 with the upper end L2 a of the ruled line L2 as a starting point. Are there. On the other hand, the right end wall cutting guide line 41 extends obliquely downward toward the center in the left-right direction of the end wall 11 with the upper end L3a of the ruled line L3 as a starting point.

  In the rear end wall 12, the left end wall bending guide line 51 extends obliquely upward toward the center in the left-right direction of the rear end wall 12 starting from the ruled line L2. On the other hand, the right end wall bending guide line 51 extends obliquely upward toward the center in the left-right direction of the rear end wall 12 with the ruled line L3 as a starting point.

Next, a procedure for forming the variable capacity box 1 will be described. In the following procedure, the bending order of the front and rear inner flaps 31, 31 and the bending order of the left and right outer flaps 32, 32 are not particularly limited. First, as shown in FIG. Is closed by the bottom wall 20. In this case, a pair of front and rear bottom flaps 21 and 21 are bent inward along ruled lines L5 and L6, and then a pair of left and right bottom outer flaps 22 and 22 are bent inward along ruled lines L7 and L8 to form a bottom inner flap. The layers 21 and 21 are overlapped on the lower surface, and these are joined by an adhesive or the like.

Next, the upper opening of the body 10 is closed by the top wall 30. When the box 1 is formed with the maximum capacity, as shown in FIG. 5, a pair of front and rear inner flaps 31, 31 are bent inward along ruled lines L9, L10, and then, a pair of left and right outer flaps 32, 32 are formed. It is bent inward along the ruled lines L11 and L12. Then, the butted portions of the outer flaps 32, 32 are sealed with a sealing tape (not shown) or the like.
Thereby, as shown in FIG. 1, the box 1 having the maximum capacity can be formed.

  Note that the box 1 may be formed as a structure in which the inner flaps 31, 31 and the outer flaps 32, 32 are only partially overlapped without closing the top wall 30. In this case, the top wall 30 can be formed by bending the plurality of bending guide lines 33 formed inside the inner flaps 31, 31 and the outer flaps 32, 32 at the same height position in the circumferential direction.

  Further, the box 1 may be configured by bending the front end wall 11, the rear end wall 12, the left side wall 13, and the right side wall 14 at a vertical intermediate portion between the slits ST1 to ST4 of the ridge line portion. In this case, the capacity can be made smaller than that shown in FIG.

  The box 1 shown in FIGS. 6 and 7 has a smaller capacity than the variable capacity box 1 of FIG. In the box 1, the top wall 30 is formed by bending each part at the upper end portions L1a to L4a (boundary portions) of the ruled lines L1 to L4.

  Specifically, since the bent portion becomes the above-described boundary portion, the inner flap 31 on the front side is bent inward together with the upper portion of the front end wall 11 that is continuous with the inner flap 31. The upper part of the front inner flap 31 and the front end wall 11 is bent inward along the bending guide line 16 passing through the upper ends L1a, L4a of the ruled lines L1, L4. Similarly, the rear inner flap 31 is bent together with the upper part of the rear end wall 12 which follows the inner flap 31. The upper portion of the rear inner flap 31 and the rear end wall 12 is bent inward along the bending guide line 16 passing through the upper end portions L3a, L4a of the ruled lines L3, L2.

Further, the left outer flap 32 is bent inward together with the upper portion of the left side wall 13 which is continuous with the outer flap 32. The upper portion of the left outer flap 32 and the left side wall 13 is bent inward along the bending guide line 16 of the left side wall 13 passing through the upper end portions L1a, L2a of the ruled lines L1, L2. Similarly, the right outer flap 32 is folded inward with the upper portion of the right side wall 14 continuing therefrom. The right outer flap 32 and the upper part of the right side wall 14 are bent inward along the bending guide line 16 of the right side wall 14 passing through the upper ends L4a, L3a of the ruled lines L4, L3.
By performing the above-described bending, the top wall 30 is formed, and the box 1 having a reduced capacity is formed (see FIG. 7).

  The box 1 in FIGS. 8 to 10 has a smaller capacity than the box 1 in FIG. In this box 1, among the three arcs 41 a to 41 c of the end wall cutting guide line 41, the top wall 30 is formed by bending each part with the lower end position of the upper arc 41 a (the upper end position of the center arc 41 b) as the bending position. are doing.

  Specifically, the front inner flap 31 is bent inward together with the upper portion of the front end wall 11 which is continuous with the inner flap 31. The upper part of the front inner flap 31 and the front end wall 11 is bent inward along the bending guide line 16 passing through the lower end position of the upper arc 41a. Similarly, the rear inner flap 31 is bent inward together with the upper part of the rear end wall 12 which follows the inner flap 31. The upper part of the rear inner flap 31 and the rear end wall 12 is bent inward along the bending guide line 16 passing through the lower end position of the upper arc 41a. As each inner flap 31 is bent, as shown in FIG. 8, partitioning pieces 45 defined by upper arcs 41 a protrude from the left and right upper ends of the front end wall 11 and the left and right upper ends of the rear end wall 12, respectively. It is formed.

  Further, as shown in FIG. 9, the left outer flap 32 is bent inward together with the upper portion of the left side wall 13 which is continuous therewith. In this case, the upper portions of the left outer flap 32 and the left side wall 13 are bent along the bending guide line 16 of the left side wall 13 at the same height position as the bending guide line 16 of the front end wall 11 and the rear end wall 12. Can be Similarly, the right outer flap 32 is folded inward with the upper portion of the right side wall 14 continuing therefrom. The right outer flap 32 and the upper portion of the right side wall 14 are bent along the bent guide line 16 of the right side wall 14 at the same height position as the bent guide line 16 of the front end wall 11 and the rear end wall 12.

  By performing the above-described bending, the top wall 30 is formed, and the box 1 having a further reduced capacity is formed (see FIG. 10). At the four corners of the top wall 30, the partitioning pieces 45 are arranged in two folds with the guide wire 51 a as a boundary by bending each outer flap 32. Therefore, the four corner portions of the top wall 30 have a quadruple structure in which the outer flap 32, the two-folded partition piece 45, and the inner flap 31 overlap in the vertical direction.

  The box 1 of FIGS. 11 to 13 has a smaller capacity than that of the box 1 of FIG. In the box 1, of the three arcs 41 a to 41 c of the end wall cutting guide wire 41, each part is bent with the lower end position of the lower arc 41 c as a bending position to form the top wall 30.

  Specifically, the front inner flap 31 is bent inward together with the front end wall 11 that follows the inner flap 31. The front inner flap 31 and the front end wall 11 are bent inward along the bending guide line 16 passing through the lower end position of the lower arc 41c. Similarly, the rear inner flap 31 is bent inward together with the rear end wall 12 which follows it. The rear inner flap 31 and the rear end wall 12 are bent inward along the bending guide line 16 passing through the lower end position of the lower arc 41c. By bending each inner flap 31, as shown in FIG. 12, the left and right sides of the front end wall 11 and the right and left sides of the rear end wall 12 are partitioned by upper three arcs 41a to 41c. 46 are respectively formed to protrude.

  As shown in FIG. 12, the left outer flap 32 is bent inward together with the left side wall 13 connected thereto. The left outer flap 32 and the left side wall 13 are bent inward along the bent guide line 16 of the left side wall 13 at the same height position as the bent guide line 16 of the front end wall 11 and the rear end wall 12. Similarly, the right outer flap 32 is folded inward with the right side wall 14 following it. The right outer flap 32 and the right side wall 14 are bent inward along the bending guide line 16 of the right side wall 14 at the same height position as the bending guide line 16 of the front end wall 11 and the rear end wall 12.

  By performing the above-described bending, the top wall 30 is formed, and the box 1 having the minimum capacity is formed (see FIG. 10). At the four corners of the top wall 30, the partitioning pieces 46 are folded and folded in two at the guide line 51 c by bending each outer flap 32. Therefore, the four corner portions of the top wall 30 have a quadruple structure in which the outer flap 32, the two-folded partition piece 46, and the inner flap 31 overlap in the vertical direction.

  In the variable capacity box 1 according to the present embodiment described above, the front end wall 11, the rear end wall 12, the left side wall 13, and the right side wall 14 (hereinafter simply referred to) by utilizing the slits ST1 to ST4 or the ruled lines L1 to L4 of the ridge line portion. (Sometimes called "walls"). In the case of bending at the slits ST1 to ST4, the boundary between the adjacent walls is separated by the slits ST1 to ST4. Can be easily folded. Therefore, the operation for changing the capacity is easy.

  When the wall is bent at the ruled lines L1 to L4, cuts are made in both end walls 11 and 12 along each end wall cutting guide line 41, and both end walls 11 and 12 are bent along the cuts. The capacity of the box 1 can be changed by bending the side walls 13 and 14 along the end wall bending guide line 51. In this case, since each end wall cutting guide line 41 and each end wall bending guide line 51 extend toward the center in the left-right direction of both end walls 11 and 12, the ruled line of each ridge line portion is provided. There is no cut in L1 to L4, and the strength of each ridge is ensured. Further, when bending the side walls 13 and 14, the partition pieces 45 and 46 left uncut on the ridge side along the end wall cutting guide lines 41 are cut along the end wall bending guide lines 51. Can be folded. This makes it possible to reinforce the vicinity of the ridge. Therefore, the box 1 is hardly deformed.

  Further, since the end wall cutting guide line 41 is formed in a stepped shape, the bending positions of the end walls 11 and 12 can be easily specified, and the operability when changing the capacity of the box 1 is improved.

  Further, the end wall cutting guide line 41 has a shape in which a plurality of arcs 41a to 41c are connected. Thereby, a notch can be easily formed in the end walls 11 and 12 by pressing a finger along the arcs 41a to 41c. Thereby, the bending operation of the end walls 11 and 12 is easily performed.

  Further, an arc-shaped cut portion 43 is formed at a lower end portion of the arcs 41 a to 41 c of the end wall cutting guide wire 41. Thereby, when the finger is pressed along the arcs 41a to 41c, it is possible to prevent the lower ends of the arcs 41a to 41c from being torn.

  Further, since the bending guide lines 16 are formed on both end walls 11 and 12 and both side walls 13 and 14, the bending operation can be easily performed. Therefore, the operability when changing the capacity of the box 1 is excellent.

(Second Embodiment)
Next, a variable capacity box 1A according to a second embodiment will be described with reference to FIGS. 14, 15A and 15B. The difference between the box 1A of the present embodiment and the box 1 of the first embodiment is that the slits ST1 to ST4 (see FIG. 1) are eliminated from each ridge and each ridge is composed of only the ruled lines L1 to L4. is there.

As shown in FIGS. 15A and 15B, the box 1A is formed by folding a blank sheet S1 obtained by cutting out one corrugated cardboard sheet into mountain lines or valleys at each ruled line. The blank sheet S1 shown in FIG. 15A is arranged so that the inner surface side can be seen. The blank sheet S1 shown in FIG. 15B is arranged so that the outer surface side can be seen.
In the present embodiment, since the slits ST1 to ST4 (see FIG. 1) are eliminated from each ridge portion, as shown in FIG. 14, the inner flap forming the top wall 30 at the upper end portions L1a to L4a of the ruled lines L1 to L4. 31, 31 and the outer flaps 32, 32 are continuous. Therefore, the height of both end walls 11 and 12 and both side walls 13 and 14 are formed lower than the box 1 of the first embodiment.

  In the present embodiment, when the box 1A is formed with the maximum capacity, as shown in FIG. 14, the top wall 30 is formed by bending each part at the upper end portions L1a to L4a of the ruled lines L1 to L4. Thus, the box 1A having the maximum capacity can be formed.

  To make the capacity smaller than this, an appropriate arc 41a (41b, 41c) is selected from the three arcs 41a to 41c of the end wall cutting guide wire 41, and the selected arc 41a (41b, 41c) is selected. ) Is bent at each position to form the top wall 30.

  Also in this embodiment, a cut is made in both end walls 11 and 12 along each end wall cutting guide line 41, and both end walls 11 and 12 can be bent along these cuts. The capacity of the box 1A can be changed by bending the side walls 13 and 14 along the end wall bending guide line 51. In this case, since each end wall cutting guide line 41 and each end wall bending guide line 51 extend toward the center in the left-right direction of both end walls 11 and 12, the ruled line of each ridge line portion is provided. There is no cut in L1 to L4, and the strength of each ridge is ensured. Further, when bending the side walls 13 and 14, the partition pieces 45 and 46 left uncut on the ridge side along the end wall cutting guide lines 41 are cut along the end wall bending guide lines 51. Can be folded. This makes it possible to reinforce the vicinity of the ridge. Therefore, the deformation of the box 1A is unlikely to occur.

As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and can be appropriately changed without departing from the gist of the present invention.
For example, although the end wall cutting guide wire 41 has a stepped shape, it is not limited to this, and may be a straight line.

  Further, although the end wall cutting guide line 41 has a stepped shape including the three arcs 41a to 41c, it may have a square stepped shape. The number of steps (projections) and the number of end wall bending guide lines 51 can be set arbitrarily.

  Further, the bending guide lines 16 extending in the front-rear direction and the left-right direction do not necessarily have to be provided.

  Although the variable capacity boxes 1 and 1A of this embodiment are made of corrugated cardboard, the variable capacity boxes may be formed of various known paperboards.

1,1A Variable capacity box 11 Front end wall (end wall)
12 rear end wall (end wall)
13 Left side wall (side wall)
14 Right side wall (side wall)
DESCRIPTION OF SYMBOLS 16 Folding guide line 17 Zipper 17a Strip area 20 Bottom wall 30 Top wall 31 Inner flap 32 Outer flap 33 Folding guide line 41 End wall cutting guide line 41a-41c Arc 43 Cut section 51 End wall bending guide line 51a- 51c Guide line L1 to L4 Ruled line ST1 to ST4 Slit

Claims (6)

A trunk portion including a pair of front and rear end walls and a pair of left and right side walls,
A bottom wall closing the lower opening of the trunk,
A top wall closing the upper opening of the trunk,
Each ridge connecting the pair of front and rear end walls and the pair of left and right side walls is configured with ruled lines,
On each of the end walls, a pair of left and right end wall cutting guide lines and a pair of left and right end wall bending guide lines are formed, respectively.
Each of the end wall cutting guide lines extends obliquely downward toward the center in the left-right direction of the end wall, with one end of the ruled line as a starting point,
The variable capacity box, wherein each of the end wall bending guide lines extends obliquely upward from the ruled line toward the end wall cutting guide line.   2. The variable capacity box according to claim 1, wherein the end wall cutting guide line is formed in a stepped shape toward a central portion of the end wall in the left-right direction. 3.   The capacity variable box according to claim 2, wherein the end wall cutting guide line has a shape in which a plurality of arcs are connected.   The variable capacity box according to claim 3, wherein a rounded cut is formed at a lower end portion of the arc of the end wall cutting guide line.   The variable capacity box according to any one of claims 1 to 4, wherein each of the ridge portions includes the ruled line and a slit continuous with one end of the ruled line.   The bending guide lines extending in the left-right direction are formed on the both end walls, and the bending guide lines extending in the front-rear direction are formed on the both side walls. The variable capacity box according to any one of the above.

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