JP6856055B2 - Variable capacity box - Google Patents

Description

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

Conventionally, as this kind of variable capacity box, the one described in Patent Document 1 is known.
The variable capacity box of Patent Document 1 includes a second fold line provided at a position on the side surface separated from the first fold line which is a boundary position between the side surface and the top surface by a predetermined distance, and also has a second fold line of each side plate. 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 folding line or the second folding line, and the height of the side surface can be changed in multiple stages to change the capacity of the box. it can.

Japanese Unexamined Patent Publication No. 2014-125237

In the variable capacity box of Patent Document 1, for example, when the capacity of the box is slightly changed, it is necessary to cut the cuttable line on each ridge of each side plate to a position having a desired capacity. Is. Therefore, the operation of changing the capacity is complicated. In addition, if the cuttable line is unintentionally torn, 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 which is easy to operate when changing the capacity and is less likely to be deformed.

In order to solve the above problems, the variable capacity box of the present invention has a body portion including a pair of front and rear end walls and a pair of left and right side walls, a bottom wall that closes a lower opening of the body portion, and the body. It is provided with a top wall that closes the upper opening of the portion. Each ridge line portion connecting the pair of front and rear end walls and the pair of left and right side walls includes at least a ruled line. 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 on each of the end walls. Each of the end wall cutting guide lines starts from one end of the ruled line and extends diagonally downward toward the central portion in the left-right direction of the end wall. Each of the end wall bending guide lines extends diagonally upward from the ruled line toward the end wall cutting guide line. Each end wall bending guide line is composed of a plurality of guide lines arranged at intervals in the vertical direction.

In the present invention, when the capacity of the box is variable, cuts are made in both end walls along each end wall cutting guide line, and both end walls are bent between the cuts. Then, while bending both end walls along the end wall bending guide line, both side walls are bent. This makes it possible to change the capacity of the box. In this case, each end wall cutting guide line and each end wall bending guide line extend toward the central portion in the left-right direction of the end wall. Therefore, both end walls and both side walls can be bent without providing a conventional cuttable line on the ridge line portion. Therefore, the strength of each ridgeline portion is ensured, and the box is less likely to be deformed. Further, when both end walls are bent while both end walls are bent, the portion left uncut on the ridgeline portion side along each end wall cutting guide line can be folded along each end wall bending guide line. Thereby, the vicinity portion of the ridge line portion can be reinforced. Therefore, the box is unlikely to be deformed.

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

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

Further, it is preferable that a rounded notch is formed at the lower end of the arc of the end wall cutting guide wire. It is possible to prevent tearing from the lower end of the arc when the fingers are pressed along the arc.

Further, it is preferable that each of the ridge line 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 by utilizing the slit or the ruled line. When bending at the slit part, the boundary part between the end wall and the side wall is separated by the slit, so that the end wall and the side wall can be easily made without the need for complicated operations using the conventional cuttable line. Can be folded into. Therefore, the operation when changing the capacitance is easy.
Further, since the cuttable line on the ridge line portion as in the conventional case is not required, the strength is improved and the box is less likely to be deformed.

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

In the present invention, it is possible to obtain a variable capacity box that is easy to operate when the capacity is variable and that the box is less likely to be deformed.

It is a perspective view which looked at the capacity variable box which concerns on 1st Embodiment of this invention from the front upper right. It is a figure which shows the blank sheet of the capacity variable box which concerns on 1st Embodiment of this invention, and is the top view which arranged so that the outer surface side can be seen. It is a figure which shows the blank sheet of the capacity variable box which concerns on 1st Embodiment of this invention, and is the top view which arranged so that the inner surface side can be seen. It is an enlarged front view of the capacity variable box which concerns on 1st Embodiment of this invention. It is explanatory drawing in the case of forming the capacity variable box which concerns on 1st Embodiment of this invention. It is explanatory drawing in the case of forming the capacity variable box which concerns on 1st Embodiment of this invention with the maximum capacity. It is explanatory drawing in the case of forming the capacity variable box which concerns on 1st Embodiment of this invention by the capacity which is bent at the boundary part between a ruled line and a slit. It is a perspective view which formed the capacity variable box which concerns on 1st Embodiment of this invention by the capacity which was bent at the boundary part between a ruled line and a slit. It is explanatory drawing in the case of forming the capacity variable box which concerns on 1st Embodiment of this invention with the capacity which was bent at the 2nd step from the top of the end wall cutting guide wire. It is explanatory drawing in the case of forming the capacity variable box which concerns on 1st Embodiment of this invention with the capacity which was bent at the 2nd step from the top of the end wall cutting guide wire. It is a perspective view which formed the capacity variable box which concerns on 1st Embodiment of this invention by the capacity which was bent at the 2nd step from the top of the end wall cutting guide line. It is explanatory drawing in the case of forming the capacity variable box which concerns on 1st Embodiment of this invention with the minimum capacity. It is explanatory drawing in the case of forming the capacity variable box which concerns on 1st Embodiment of this invention with the minimum capacity. It is a perspective view which formed the capacity variable box which concerns on 1st Embodiment of this invention with the minimum capacity. It is a perspective view which looked at the capacity variable box which concerns on 2nd Embodiment of this invention from the front upper right. It is a figure which shows the blank sheet of the capacity variable box which concerns on 2nd Embodiment of this invention, and is the top view which arranged so that the outer surface side can be seen. It is a figure which shows the blank sheet of the capacity variable box which concerns on 2nd Embodiment of this invention, and is the top view which arranged so that the inner surface side can be seen.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each embodiment, the same parts are designated by the same reference numerals and duplicated description will be omitted.
In the following description, the front-back, left-right, up-down directions are set for convenience in explaining the variable-capacity box, and do not limit the configuration of the variable-capacity box.

(First Embodiment)
As shown in FIG. 1, the variable capacity box 1 (hereinafter, may be simply referred to as “box 1”) has a body portion 10 composed of a pair of front and rear end walls 11 and 12 and a pair of left and right side walls 13 and 14, and a body. A bottom wall 20 that closes the lower opening of the portion 10 and a top wall 30 that closes the upper opening of the body portion 10 are provided.

As shown in FIGS. 2A and 2B, the box 1 is formed by folding a blank sheet S obtained by cutting out a single corrugated cardboard sheet into mountain folds or valley folds at each ruled line. The blank sheet S shown in FIG. 2A is arranged so that the inner surface side can be seen. Further, the blank sheet S shown in FIG. 2B is arranged so that the outer surface side can be seen.
As shown in FIG. 2B, the ruled lines (folded lines) that partition the end walls 11, 12, the side walls 13, 14, the bottom wall 20 (see FIG. 1), and the top wall 30 (see FIG. 1) of the blank sheet S are blank sheets. It is a linear groove formed by pushing the inner surface of S.
A notch (half-cut line, etc.) may be formed in the ruled line. In this way, the blank sheet S can be easily bent at the ruled line.

The front end wall 11 is formed in a quadrangle shape as shown in FIG. 1 (see FIGS. 2A and 2B).
A left side wall 13 is continuously provided on the left edge portion 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 a right angle to the front end wall 11. The left side wall 13 is formed in a quadrangular shape.

The ridge line portion (corner portion) of 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 discontinuous at the slit ST1.

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

The ridge line portion (corner portion) 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 discontinuous at the slit ST2.

A joint 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 joint piece 15 is formed in a strip shape along the right edge of the rear end wall 12.
The joining piece 15 is a portion to be joined to the rear end portion of the inner surface of the right side wall 14 by an adhesive.

A right side wall 14 is continuously provided on 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 a right angle to the front end wall 11. The right side wall 14 has the same shape as the left side wall 13.

The ridge line portion (corner portion) of 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 discontinuous at the slit ST4.

The ridge line portion (corner portion) 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 discontinuous at the slit ST3. The slit ST3 is formed by connecting the rear end wall 12 and the right side wall 14 via the joint piece 15.

As shown in FIG. 2B, a plurality of parallel bending guide lines 16 extending in the longitudinal direction of each wall are formed 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. The bent guide lines 16 are formed at equal intervals in the lateral direction of the flaps. Some of the plurality of bent guide lines 16 are formed corresponding to the stepped portions of the stepped end wall cutting guide lines 41 described later.

By bending the blank sheet S (see FIGS. 2A and 2B) as described above along the ruled lines L1 to L4 and joining the joining piece 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 are joined. The wall 12 and the right side wall 14 form a square tubular body portion 10 (see FIG. 1).

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

As shown in FIG. 1, the upper opening of the body portion 10 is closed by the top wall 30. The top wall 30 is composed of 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 continuously provided on the upper edge of the front end wall 11 via the ruled line L9. As shown in FIG. 1, the inner flap 31 on the front side extends rearward from the upper edge portion of the front end wall 11. The inner flap 31 on the front side is formed at a right angle to the front end wall 11.

The inner flap 31 on the rear side is continuously provided on the upper edge of the rear end wall 12 via the 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 a right angle to the rear end wall 12.

As shown in FIGS. 2A and 2B, the left outer flap 32 is connected to the upper edge of the left wall 13 via the ruled line L11. As shown in FIG. 1, the left outer flap 32 extends from the upper edge of the left wall 13 toward the right. The left outer flap 32 is formed at right angles to the left 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 wall 14 via the ruled line L12. As shown in FIG. 1, the outer flap 32 on the right side extends from the upper edge of the right wall 14 toward the left. The outer flap 32 on the right side is formed at a right angle to the right wall 14.

As shown in FIG. 2B, a plurality of parallel bending guide lines 33 extending in the longitudinal direction of the flaps 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 lateral direction of the flap 31. In the present embodiment, the bending guide lines 33 are arranged at the same intervals as the bending guide lines 16 described above.

As shown in FIGS. 2A and 2B, a pair of left and right end wall cutting guide lines 41 and 41 and a pair of left and right end wall bending guide lines 51 and 51 are formed on the front end wall 11 and the rear end wall 12. .. Since the pair of left and right end wall cutting guide lines 41 and 41 and the pair of left and right end wall bending guide lines 51 and 51 have the same configuration as the front end wall 11 and the rear end wall 12, they are formed on the front end wall 11 below. What is to be done 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 bending guide lines 51, 51 are line-symmetrical about the reference line X1 that divides the front end wall 11 in the left-right direction. Is formed in. The end wall cutting guide line 41 and the end wall bending guide line 51 are both formed by perforated cut lines. The end wall bending guide line 51 can also 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 portion L1a of the ruled line L1 toward the central portion in the left-right direction of the front end wall 11. On the other hand, the right end wall cutting guide line 41 extends diagonally downward from the upper end portion L4a of the ruled line L4 toward the central portion in the left-right direction of the front end wall 11.
Each end wall cutting guide line 41 is formed in a stepped shape in which three arcs 41a to 41c are connected toward the central portion in the left-right direction of the front end wall 11. At the lower end of each of the arcs 41a to 41c, a rounded (arc concave) notch 43 that curves downward is formed.

The inclination angle of each end wall cutting guide line 41 is 45 degrees with respect to the ruled lines L1 and L4 when a common tangent line (not shown) tangent to the bulging end of each arc 41a to 41c is drawn. It is set to be an angle.

The left end wall bending guide line 51 extends diagonally upward from the ruled line L1 toward the central portion in the left-right direction of the front end wall 11. On the other hand, the right end wall bending guide line 51 extends diagonally upward from the ruled line L4 toward the central portion in the left-right direction of the front end wall 11.
Each end wall bent guide line 51 is composed of three parallel guide lines 51a to 51c in the vertical direction. The guide lines 51a to 51c are formed at equal intervals. The upper guide wire 51a extends toward the bulging end of the upper arc 41a of the end wall cutting guide wire 41. Further, the central guide line 51b extends toward the lower end portion of the upper arc 41a of the end wall cutting guide line 41 (the boundary portion between the upper arc 41a and the central arc 41b). Further, the lower guide line 51c extends toward the bulging end of the central arc 41b of the end wall cutting guide line 41. Each end wall bending guide line 51 is orthogonal to a common tangent (not shown) tangent to the bulging ends of each arc 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 diagonally downward from the upper end L2a of the ruled line L2 toward the central portion in the left-right direction of the rear end wall 12. Exists. On the other hand, the right end wall cutting guide line 41 extends diagonally downward from the upper end portion L3a of the ruled line L3 toward the central portion in the left-right direction of the end wall 11.

Further, in the rear end wall 12, the left end wall bending guide line 51 extends diagonally upward from the ruled line L2 toward the central portion in the left-right direction of the rear end wall 12. On the other hand, the right end wall bending guide line 51 extends diagonally upward from the ruled line L3 toward the central portion in the left-right direction of the rear end wall 12.

Next, the 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 and 31 and the bending order of the left and right outer flaps 32 and 32 are not particularly limited. First, as shown in FIG. 4, the lower opening of the body portion 10 Is closed with the bottom wall 20. In this case, the pair of front and rear in-bottom flaps 21 and 21 are bent inward along the ruled lines L5 and L6, and then the pair of left and right outer bottom flaps 22 and 22 are bent inward along the ruled lines L7 and L8. It is overlapped on the lower surfaces of 21 and 21, and these are joined with an adhesive or the like.

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

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 formed by bending the front end wall 11, the rear end wall 12, the left side wall 13 and the right side wall 14 at an intermediate portion in the vertical direction of 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 this box 1, each portion is bent at the upper end portions L1a to L4a portions (boundary portions) of the ruled lines L1 to L4 to form the top wall 30.

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

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

Box 1 of FIGS. 8 to 10 has a smaller capacity than that of box 1 of FIG. In this box 1, of the three arcs 41a to 41c of the end wall cutting guide wire 41, each part is bent with the lower end position of the upper arc 41a (the upper end position of the central arc 41b) as the bending position to form the top wall 30. 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 along with the upper portion of the trailing end wall 12 that is continuous with it. 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, the partition pieces 45 partitioned by the upper arc 41a 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 outer flap 32 on the left side is bent inward together with the upper part of the left side wall 13 which is continuous with the outer flap 32. In this case, the upper part of the left outer flap 32 and the left side wall 13 is bent along the bending guide line 16 of the left side wall 13 at the same height as the bending guide line 16 of the front end wall 11 and the rear end wall 12. Be done. Similarly, the outer flap 32 on the right side is bent inward along with the upper part of the right side wall 14 that is continuous with it. The upper part of the outer flap 32 on the right side and the right side wall 14 is bent along the bending guide line 16 on the right side wall 14 at the same height as the bending guide line 16 on the front end wall 11 and the rear end wall 12.

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

Box 1 of FIGS. 11 to 13 has a smaller capacity than that of box 1 of FIG. 10 to have a minimum capacity. In this box 1, of the three arcs 41a to 41c of the end wall cutting guide wire 41, each part is bent with the lower end position of the lower arc 41c as the bending position to form the top wall 30.

Specifically, the inner flap 31 on the front side is bent inward together with the front end wall 11 continuous with the inner flap 31. The front inner flap 31 and the front end wall 11 are bent inward along a bending guide line 16 passing through the lower end position of the lower arc 41c. Similarly, the rear inner flap 31 is bent inward along with the trailing end wall 12 that is continuous with it. The rear inner flap 31 and the rear end wall 12 are bent inward along a bending guide line 16 passing through the lower end position of the lower arc 41c. As shown in FIG. 12, each inner flap 31 is bent so that the left and right side portions of the front end wall 11 and the left and right side portions of the rear end wall 12 are partitioned by the upper three arcs 41a to 41c. Each of the 46 is projected.

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

By performing the above 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 compartment pieces 46 are folded in half with the guide wire 51c as a boundary by bending each outer flap 32. Therefore, the four corners of the top wall 30 have a quadruple structure in which the outer flap 32, the folded partition piece 46, and the inner flap 31 overlap in the vertical direction.

In the variable capacity box 1 of 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 as simple) use the slits ST1 to ST4 or the ruled lines L1 to L4 of the ridge line portion. Can be folded (sometimes called a "wall"). When bending through the slits ST1 to ST4, the boundary between adjacent walls is separated by the slits ST1 to ST4, so that the wall can be formed without the need for complicated operations using the conventional cuttable line. It can be easily bent. Therefore, the operation when changing the capacitance is easy.

When the walls are bent along the ruled lines L1 to L4, cuts are made in both end walls 11 and 12 along the end wall cutting guide lines 41, and both end walls 11 and 12 are bent along the cuts. Then, 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 of the end wall cutting guide line 41 and each end wall bending guide line 51 extends toward the central portion in the left-right direction of both end wall walls 11 and 12, the ruled line of each ridge line portion There are no notches in L1 to L4, and the strength of each ridgeline portion is ensured. Further, when the side walls 13 and 14 are bent, the partition pieces 45 and the partition pieces 46 left uncut on the ridgeline portion side along the end wall cutting guide lines 41 are placed along the end wall bending guide lines 51. Can be folded. Thereby, the vicinity portion of the ridge line portion can be reinforced. Therefore, the box 1 is unlikely to be deformed.

Further, since the end wall cutting guide line 41 is formed in a stepped shape, it is easy to specify the bending position of both end walls 11 and 12, 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. As a result, a notch can be easily formed in the end walls 11 and 12 by pressing the fingers along the arcs 41a to 41c. This facilitates the bending operation of the end walls 11 and 12.

Further, a rounded cut portion 43 is formed at the lower end portion of the arcs 41a to 41c of the end wall cutting guide wire 41. This makes it possible to prevent tearing from the lower end of the arcs 41a to 41c when the fingers are pressed along the arcs 41a to 41c.

Further, since the bending guide lines 16 are formed on the both end walls 11 and 12 and the 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, the capacity variable box 1A of the 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 line portion, and each ridge line portion 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 a single corrugated cardboard sheet into mountain folds or valley folds at each ruled line. The blank sheet S1 shown in FIG. 15A is arranged so that the inner surface side can be seen. Further, 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 line 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. The 31 and 31 and the outer flaps 32 and 32 are continuous. Therefore, the heights of the both end walls 11 and 12 and the side walls 13 and 14 are formed lower than those of 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, each portion is bent at the upper end portions L1a to L4a of the ruled lines L1 to L4 to form the top wall 30. As a result, the box 1A having the maximum capacity can be formed.

When the capacitance is made 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 set as the bending position, and each part is bent to form the top wall 30.

Also in the present embodiment, both end walls 11 and 12 can be cut along the end wall cutting guide lines 41, and both end walls 11 and 12 can be bent along the cuts. Then, 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 of the end wall cutting guide line 41 and each end wall bending guide line 51 extends toward the central portion in the left-right direction of both end wall walls 11 and 12, the ruled line of each ridge line portion There are no notches in L1 to L4, and the strength of each ridgeline portion is ensured. Further, when the side walls 13 and 14 are bent, the partition pieces 45 and the partition pieces 46 left uncut on the ridgeline portion side along the end wall cutting guide lines 41 are placed along the end wall bending guide lines 51. Can be folded. Thereby, the vicinity portion of the ridge line portion can be reinforced. Therefore, the box 1A is unlikely to be deformed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be appropriately modified without departing from the spirit of the present invention.
For example, the end wall cutting guide line 41 has a stepped shape, but is not limited to this, and may be a straight line.

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

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

Although the variable-capacity boxes 1 and 1A of the present embodiment are made of corrugated cardboard, the variable-capacity box 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)
16 Folded guide line 17 Zipper 17a Band-shaped area 20 Bottom wall 30 Top wall 31 Inner flap 32 Outer flap 33 Folded guide line 41 End wall cutting guide line 41a to 41c Arc 43 Notch 51 End wall bending guide line 51a to 51c Guide line L1 to L4 Ruled line ST1 to ST4 Slit

Claims (6)

A body consisting of a pair of front and rear end walls and a pair of left and right side walls,
The bottom wall that closes the lower opening of the body and
It is provided with a top wall that closes the upper opening of the body.
Each ridge line portion connecting the pair of front and rear end walls and the pair of left and right side walls is configured to include at least a ruled line.
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 on each of the end walls.
Each of the end wall cutting guide lines starts from one end of the ruled line and extends diagonally downward toward the central portion in the left-right direction of the end wall.
Each of the end wall bending guide lines extends diagonally upward from the ruled line toward the end wall cutting guide line .
Each of the end wall bent guide lines is a variable capacity box characterized by being composed of a plurality of guide lines arranged at intervals in the vertical direction. 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 in the left-right direction of the end wall. The variable capacity box according to claim 2, wherein the end wall cutting guide wire has a shape in which a plurality of arcs are connected. The variable capacity box according to claim 3, wherein a radius-shaped notch is formed at the lower end of the arc of the end wall cutting guide wire. The capacity variable box according to any one of claims 1 to 4, wherein each ridge line portion is composed of the ruled line and a slit continuous with one end of the ruled line. Claims 1 to 5 are characterized in that a bending guide line extending in the left-right direction is formed on both end walls, and a bending guide line extending in the front-rear direction is formed on both side walls. The variable capacity box according to any one of the above items.

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