JP4908647B1 - Bag and bellows structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the accordion fold overlap when the bellows is folded up and orderly with good reproducibility.
SOLUTION: A rectangular cylindrical bellows structure 30 can be expanded and contracted vertically by having a four-sided bellows shape, and has sheet-like cores 72 to 75 between the cloths 71 on the front and back sides of the four rounds. ing. The cores 72 to 75 have a trapezoidal shape in which the positions of the cores 72 to 75 are arranged for each of the bellows folds on each of the four circumferences and the angle between the long bottom side and both oblique sides is about 45 degrees. In the cores 72 to 75, the vertical direction of the long bottom side and the short bottom side is aligned between the four rounds of the same step of the bellows, and the vertical direction of the long bottom side and the short bottom side is switched for each step. The fabrics 71 on the front and back sides are sewn together by sewing threads 76 around the cores 72 to 75.
[Selection] Figure 5

Description

  The present invention relates to a bag having a bellows structure and a bellows structure suitable for use in the bag.

  Conventionally, what is indicated by patent documents 1 concerning an application by the same applicant as a bag which has a bellows structure is known. The bag has an accordion-shaped upper bag body connected on the lower bag body, thereby making it possible to adjust the height of the bag according to the capacity.

  However, this bag has a problem that when the bellows-like upper bag body contracts, the overlapping of the bellows folds does not become orderly, and it is difficult to realize a certain shape with good reproducibility. was there. That is, despite the fact that fashion is important, there is a problem that it gives a cluttered impression and lacks a so-called “fashionable feeling”.

Utility Model Registration No. 3162919

  The present invention has been made in view of the above problems, and has a bag that makes the overlapping of the bellows folds when the bellows is folded up orderly with good reproducibility, and a bellows structure suitable for use in the bag. The purpose is to provide.

  In order to solve the above-mentioned problems and achieve the above-mentioned object, a first aspect of the present invention is a bag, which is provided with a rectangular cylindrical bellows structure in a body portion. The bellows structure can be vertically expanded and contracted by having a bellows shape on the four sides, and has a sheet-like core between the cloths on the front and back of the four sides. The sheet-like core has a trapezoidal shape that is arranged for each accordion fold of each of the four circumferences, the position of which is constrained, and the angle between the long base and both oblique sides forms about 45 degrees. Further, the trapezoidal sheet-shaped core has the long bottom side and the short bottom side vertically aligned between the four rounds of the same step of the bellows, and the vertical direction of the long bottom side and the short bottom side is switched for each step.

  According to this configuration, since a sheet-like core is disposed for each pleat and the position thereof is constrained, a certain rigidity is imparted to each pleat by the core. Thereby, the shape of each pleat is maintained. The sheet-shaped core is trapezoidal, and the vertical direction of the long bottom side and the short bottom side is aligned between the four rounds of the same step of the bellows, and the vertical direction of the long bottom side and the short bottom side is switched for each step. The contraction of the bellows is realized by retreating inward the boundary where the short bottom sides of the core face each other among the upper and lower fold boundaries. Since the angle between the long base of the trapezoidal sheet-shaped core and both oblique sides is about 45 degrees, when the bellows is folded, the portion of the fold that has the rigidity modeled by the trapezoidal sheet-shaped core is on the same level. It folds without overlapping each other with the rigidity of the adjacent pleats. Since the core has a trapezoidal shape, a portion of the fabric without a core remains at both ends of the folds, that is, at the corners of the four corners of the bellows. The portion of the fabric without the core is formed as a continuous region between the upper and lower two stages where the short bottom sides of the trapezoidal sheet-shaped core face each other, and bends outward with respect to the pleated portion with the core. When the bellows contracts, the coreless fabric region is bent sideways, and the adjacent left and right fabrics in the region approach each other. Since the angle between the long bottom side of the trapezoidal sheet-shaped core and both oblique sides is about 45 degrees, when the bellows is folded, the adjacent left and right fabrics in the region substantially overlap each other, so that the region is Folded between the upper and lower folds in a bent state. As described above, the bellows shape when the bellows is expanded and contracted has good reproducibility, and the bellows can be folded in a state where the folds are regularly arranged. It should be noted that the range of the numerical value of “about 45 degrees” is allowed in a range where the above action or effect is substantially exhibited.

According to a second aspect of the present invention, there is provided the bag according to the first aspect, wherein each of the trapezoidal cores has a rounded corner (corner) between the long bottom side and both oblique sides. It is what you are doing.
According to this configuration, damage to the fabric due to the acute corners of the trapezoidal core is avoided.

  According to a third aspect of the present invention, there is provided the bag according to the first or second aspect, wherein the trapezoidal sheet-shaped core has a long bottom side on the lower side in the lowermost fold, and the uppermost stage. In the folds, the long base is on the upper side.

  According to this configuration, the coreless fabric portion belonging to all the pleats belongs to a region extending over any two upper and lower stages where the short bottom sides of the trapezoidal sheet-like cores face each other. For this reason, when the bellows is folded, all coreless fabric portions belonging to the pleats are folded between the upper and lower folds while being bent sideways. In other words, the bellows can be folded over the entire bellows in a state where the overlapping of the folds is orderly.

  According to a fourth aspect of the present invention, there is provided the bag according to any one of the first to third aspects, wherein the cloths on the front and back sides are fixed to each other along the periphery of the hypotenuse of the trapezoidal sheet-shaped core. It is what has been.

  According to this configuration, in the fold formed at the boundary between the cored fabric portion and the coreless fabric portion, that is, the crease formed along the hypotenuse of the trapezoidal sheet-shaped core, the front and back fabrics Since they are not separated from each other, a fold without turbulence is formed.

According to a fifth aspect of the present invention, there is provided the bag according to any one of the first to fourth aspects, wherein the center of the fabric region surrounded by the four oblique sides of the trapezoidal sheet-shaped core is provided. The fabrics on the front and back sides are fixed to each other along a line that crosses the street from side to side.
According to this configuration, the fabrics on the front and back sides are not separated from each other in the left and right folds where the coreless fabric region is bent, so that a fold without any disturbance is formed.

According to a sixth aspect of the present invention, there is provided the bag according to any one of the first to fifth aspects, wherein the center of the region of the fabric surrounded by the four oblique sides of the trapezoidal sheet-shaped core is provided. The fabrics on the front and back sides are fixed to each other along a line that runs vertically through the street.
According to this configuration, since the fabrics on the front and back sides are not separated from each other in the up-down fold where the region of the coreless fabric is bent, a fold without turbulence is formed.

  According to a seventh aspect of the present invention, there is provided the bag according to any one of the first to sixth aspects, wherein the cloth on the front and back sides is formed along the gap between the bottoms of the trapezoidal sheet-shaped cores facing each other. They are fixed to each other.

  According to this configuration, since the fabrics on the front and back sides are not separated from each other in the fold formed along the boundary between the upper and lower folds, a fold without turbulence is formed.

  According to an eighth aspect of the present invention, there is provided a bag according to any one of the fourth to seventh aspects, wherein the fixing of the cloth on the front and back sides is made by sewing. .

  According to this structure, the crease | fold of the cloth | dough along an adhering site | part is easy to attach sharply, and it is beautiful visually.

  According to a ninth aspect of the present invention, there is provided the bag according to any one of the fourth to seventh aspects, wherein the fixing of the front and back fabrics is performed by bonding with an adhesive. Is.

  According to this configuration, since the labor of sewing can be saved to fix the fabric, the manufacture is easy.

  According to a tenth aspect of the present invention, there is provided the bag according to any one of the first to ninth aspects, wherein the upper part of the bellows structure or the upper part thereof is a carry bag support. A support member that is slidably supported up and down is further provided.

  According to this configuration, the bellows structure can be expanded and contracted while maintaining the state where the upper portion of the bag is supported by the carry bag support column, so that the bag can be used as a carry bag.

  The eleventh aspect of the present invention is the bag according to any one of the first to tenth aspects, further comprising a box-shaped lower bag body. And the said bellows structure is connected and formed on the said lower bag body. The bag further includes a lid formed on the bellows structure and connected to the bellows structure so as to open and close the opening of the bellows structure.

  According to this structure, a certain amount of capacity is secured even when the bellows is folded by the lower bag body. Further, the bag contents can be protected by the lid that can be opened and closed.

  According to a twelfth aspect of the present invention, there is provided the bag according to the eleventh aspect, wherein the lower bag body is a sheet-like second between the bottom, front, back and front and back fabrics. It has a core.

  According to this configuration, while applying a flexible fabric to the lower bag body, a certain rigidity is given by the second core. As a result, the lower bag body maintains a certain shape as if it were a hard case.

  According to a thirteenth aspect of the present invention, there is provided a bag according to the eleventh or twelfth aspect, wherein the lid has a sheet-like third core between at least the top and bottom fabrics. I have it.

  According to this configuration, while applying a flexible fabric to the lid, a certain rigidity is imparted to the top surface of the lid by the third core. Thereby, the top surface of the lid body maintains a certain shape.

  According to the fourteenth aspect of the present invention, there is provided a bellows structure having a rectangular cylindrical shape, and the bellows structure can be vertically expanded and contracted because the four circumferences are bellows-like. It has a sheet-like core between the fabrics. The sheet-like core has a trapezoidal shape that is arranged for each accordion fold of each of the four circumferences, the position of which is constrained, and the angle between the long base and both oblique sides forms about 45 degrees. In the trapezoidal sheet-shaped core, the long bottom side and the short bottom side are aligned in the vertical direction between the four rounds of the same step of the bellows, and the vertical direction of the long bottom side and the short bottom side is switched for each step.

  According to this structure, there exists an effect | action and effect similar to what was described about the bag which concerns on the 1st aspect of this invention.

  According to a fifteenth aspect of the present invention, there is provided a bellows structure according to the fourteenth aspect, wherein each of the trapezoidal cores is rounded at a corner (corner) between the long bottom side and both oblique sides. It is what you have.

  According to this structure, there exists an effect | action similar to the place which described the bag which concerns on the 2nd aspect of this invention, and an effect.

  According to a sixteenth aspect of the present invention, there is provided a bellows structure according to the fourteenth or fifteenth aspect, wherein the trapezoidal sheet-shaped core has a long bottom side on the lower side in the lowest fold, In the upper fold, the long bottom side is on the upper side.

  According to this structure, there exists an effect | action and effect similar to the place which described the bag which concerns on the 3rd aspect of this invention.

  According to a seventeenth aspect of the present invention, there is provided a bellows structure according to any one of the fourteenth to sixteenth aspects, wherein the fabrics on the front and back sides of each other along the hypotenuse of the trapezoidal sheet-shaped core. It is fixed.

  According to this structure, there exists an effect | action and effect similar to the place which described the bag which concerns on the 4th aspect of this invention.

According to an eighteenth aspect of the present invention, there is provided a bellows structure according to any one of the fourteenth to seventeenth aspects, wherein the center of the fabric region is surrounded by the four oblique sides of the trapezoidal sheet-shaped core. The fabrics on the front and back sides are fixed to each other along a line passing through the left and right.
According to this structure, there exists an effect | action and effect similar to the place which described the bag which concerns on the 5th aspect of this invention.

According to a nineteenth aspect of the present invention, there is provided a bellows structure according to any of the fourteenth to eighteenth aspects, wherein the center of the fabric region is surrounded by the four oblique sides of the trapezoidal sheet-shaped core. The fabrics on the front and back sides are fixed to each other along a line that passes through and runs vertically.
According to this structure, there exists an effect | action and effect similar to the place which described the bag which concerns on the 6th aspect of this invention.

According to a twentieth aspect of the present invention, there is provided a bellows structure according to any one of the fourteenth to nineteenth aspects, wherein the trapezoidal sheet-like core has a cloth on the front and back sides along a gap between the bottoms facing each other. Are fixed to each other.
According to this structure, there exists an effect | action and effect similar to what was described about the bag which concerns on the 7th aspect of this invention.

According to a twenty-first aspect of the present invention, there is an accordion structure according to any of the seventeenth to twentieth aspects, wherein the fixing of the cloth on the front and back sides is made by sewing. is there.
According to this structure, there exists an effect | action and effect similar to what was described about the bag which concerns on the 8th aspect of this invention.

  According to a twenty-second aspect of the present invention, there is provided a bellows structure according to any of the seventeenth to twentieth aspects, wherein the fixing of the front and back fabrics is performed by bonding with an adhesive. It is what.

  According to this structure, there exists an effect | action and effect similar to the place which described the bag which concerns on the 9th aspect of this invention.

  As described above, according to the present invention, it is possible to realize a bag in which the overlapping of the bellows folds when the bellows is folded is made orderly with good reproducibility, and a bellows structure suitable for use in the bag.

It is a front perspective view which shows the usage type mounted on the trolley | bogie for carry bags regarding the bag by one embodiment of this invention. It is a front perspective view which shows the form which extended the bellows structure regarding the usage condition of the bag shown in FIG. It is a back perspective view which shows the bag shown in FIG. It is a figure which shows the structure of each part of the bag of FIG. 1, (a) is an expanded view of a lower bag body, (b) is an expanded view of a cover body, (c) is a connection part of a cover body and a bellows structure, It is the figure which looked at the fastener from front diagonally upward. It is an expanded view which expands and shows the bellows structure of the bag of FIG. It is a perspective view which shows the change of the shape accompanying expansion / contraction of the bellows structure of the bag of FIG. 1, (a) is the state which extended the bellows structure, (b) is the state which contracted the bellows structure to some extent, and (d) The state where the bellows structure is folded is shown respectively.

  1 and 2 are external perspective views of a bag according to an embodiment of the present invention. These drawings particularly show a usage pattern in which the bag is mounted on a carriage for a carry bag. In particular, FIG. 1 shows a contracted configuration of the bag bellows structure, and FIG. 2 shows an expanded configuration. The bag 101 includes a lower bag body 10, a bellows structure 20, a lid body 30, and a fastener 40. The lower bag body 10 has a rectangular box shape, and forms a bottom surface of the bag body 101 and four side surfaces connected to the bottom surface. The bellows structure 20 has a rectangular cylindrical shape and is connected to the lower bag body 10 to form an upper bag body. The bellows structure 20 has a bellows shape on all four sides, so that it can expand and contract vertically. The lid 30 is formed on the bellows structure 20 so as to cover the upper opening of the bellows structure 20 so as to be openable and closable. The fastener 40 is a member that maintains the lid 30 in a closed state.

  The lower bag body 10 and the lid body 30 may be made of a flexible material such as cloth, a vinyl sheet, a waterproof cloth, or may be made of leather having a certain degree of rigidity, a plastic plate, or the like. Even if it is made of flexible materials such as cloth and vinyl sheets, the materials are doubled inside and outside to maintain a certain shape, and from materials with some degree of rigidity, such as paper and plastic sheets The resulting core material may be sandwiched between them. In the bag 101 according to the present embodiment, as an example, a double cloth in which a plastic sheet is sandwiched is used. As will be described in detail later, the bellows structure 20 is made of a flexible material such as a double cloth or a vinyl sheet sandwiching a core material made of a material having a certain degree of rigidity, such as paper or a plastic sheet.

  The bag 101 is for a carry bag as an example, and is used together with the carriage 150. The carriage 150 is fixed to the base 80 on which the bag 101 or the like is placed, for example, four casters 85 attached to the bottom surface thereof, for example, two pillars 90 erected on the back of the base 80, and the head of the pillar 90. A handle 95 is provided. The support 90 can be extended and contracted. Since the structure of the carriage 150 for carrying bags is well known in the art, a detailed description thereof will be omitted.

  FIG. 3 is a rear perspective view of the bag 101. On the back surface of the bag 101, a support member 60 that supports the bag 101 on the support 90 is provided. In the example of FIG. 3, the support members 60 are provided at three locations, the lower portion and the upper portion of the lower bag body 10, and the upper portion of the bellows structure 20 or the lid body 30. The support member 60 has, for example, a pair of belts 61 and a pair of fastening members 62. One end of each band 61 is fixed by sewing or the like near the left and right ends of the back surface of the bag 101, and the other end is connected to one of a pair of fastening members 62. The pair of fastening members 62 can be easily attached and detached by finger operation. The fastening member 62 illustrated in FIG. 3 is a known member that is commercially available. The bag 101 is supported by the column 90 by guiding the pair of belt members 61 to the back surfaces of the two columns 90 and fastening them with the fastening members 62. In particular, the uppermost fastening member 62 prevents the bellows structure 20 from tilting away from the support 90 when the bellows structure 20 is extended. The uppermost support member 60 can be prevented from being hindered by obstructing the expansion / contraction operation of the bellows structure 20 and the expansion / contraction operation of the column 90 by loosely fastening.

  The support member 60 can be provided at another site such as near the center of the bellows structure 20 in the vertical direction. When the bellows structure 20 extends greatly, it is desirable to provide the support member 60 not only at the upper part of the bellows structure 20 but also at other parts. Further, the bottom surface of the lower bag body 10 and the upper surface of the base 80 may be detachably fixed with a hook-and-loop fastener or the like.

  4A and 4B are diagrams showing the structure of each part of the bag 101, where FIG. 4A is a development view of the lower bag body 10, FIG. 4B is a development view of the lid body 30, and FIG. It is the figure which looked at the connection part 45 and the fastener 40 with 20 from front diagonally upward. As shown in FIG. 4A, the lower bag body 10 has an L-shaped fabric 18 and rectangular sheet-shaped cores 11-15. The fabric 18 is a flexible sheet-like material such as cloth or vinyl. The cloth 18 is double-sided, and the cores 11 to 15 are arranged between the cloth 18 on the front and back. In FIG. 4A, the cores 11 to 15 are originally hidden by one of the fabrics 18 and cannot be seen, but are represented by solid lines in order to show the shape and positional relationship. The cores 11 to 15 are cores disposed on the bottom surface, the back surface, the right side surface, the front surface, and the left side surface of the lower bag body 10, respectively. The cores 11 to 15 are formed of, for example, a plastic sheet or the like, thereby giving a certain degree of rigidity to each surface of the lower bag body 10. A fabric 18 on the front and back sides is sewn by a sewing thread 17 around the cores 11 to 15 and along the gaps between them. FIG. 4A also corresponds to a process chart showing one process for manufacturing the lower bag body 10. The lower bag body 10 is completed by sewing together the seam allowance portions between the bottom surface and the right side surface, the bottom surface and the front surface, the bottom surface and the left side surface, and the left side surface and the back surface. With respect to these seam allowance portions, it is not always necessary to sew the fabric 18 on the front and back with the sewing thread 17 in advance as shown in FIG.

  As shown in FIG. 4B, the lid 30 has a rectangular fabric 31 and a rectangular sheet-shaped core 35. For example, the material of the fabric 31 is the same as that of the fabric 18 of the lower bag body 10. The fabric 31 is double-sided, and the core 35 is disposed between the front and back fabrics 31. In FIG. 4B as well, the core 35 is shown by a solid line where it is hidden behind one of the fabrics 31 and cannot be seen. The core 25 is made of the same material as the cores 11 to 15, for example. Along the periphery of the core 35, the fabrics 31 on the front and back sides are sewn together by a sewing thread 33.

  The connecting portion 45 shown in FIG. 4C is a member that is sewn to the upper end of the back portion of the bellows structure 20 and the back portion of the lid body 30 to connect the bellows structure 20 and the lid body 30. Also in the connecting portion 45, a rectangular sheet-shaped core 37 is disposed between the rectangular front and back fabrics 36. For example, the material of the fabric 36 is the same as that of the fabric 18 of the lower bag body 10. Also in FIG. 4C, the core 37 is represented by a solid line where it is hidden behind one of the fabrics 36 and cannot be seen. The core 37 is made of the same material as the cores 11 to 15, for example. A fabric 36 on the front and back sides is sewn together with a sewing thread 38 along the periphery of the core 37. Fasteners 40 are connected to the left and right ends of the fabric 36. The fabric 36 and the fastener 40 may be sewn simultaneously by a sewing thread 38 that stitches the fabric 36 on the front and back sides, or may be sewn by another sewing thread. The back portion of the lid 30 is connected to the upper end portion of the connecting portion 45, and the upper end portion of the bellows structure 20 is connected to the lower end portion. The connecting portion 45 and the lid 30, and the connecting portion 45 and the bellows structure 20 may be sewn at the same time by the sewing thread 38 for sewing the cloth 36 on the front and back, or may be sewn by another sewing thread.

  FIG. 5 is a development view showing the structure of the bellows structure 20 of the bag 101. The bellows structure 20 includes a rectangular fabric 71 and trapezoidal sheet-shaped cores 72 to 75. For example, the material of the fabric 71 is the same as that of the fabric 18 of the lower bag body 10. The cloth 71 is double-sided, and the cores 72 to 75 are arranged between the cloth 71 on the front and back. Also in FIG. 5, the cores 72 to 75 are represented by solid lines where they are hidden behind one of the fabrics 71 and cannot be seen. The cores 72 to 75 are cores arranged on the left side surface, the back surface, the right side surface, and the front surface of the bellows structure 20, respectively. The cores 72 to 75 are made of the same material as the cores 11 to 15, for example, and give a certain degree of rigidity to the folds on each of the four circumferences of the bellows structure 20. Each of the trapezoidal cores 72 to 75 has an angle between the long bottom side and both oblique sides of about 45 degrees, and has a rounded corner (corner) between the long bottom side and both oblique sides forming the angle. . Due to the roundness of the acute angle portion, it is possible to prevent the fabric 71 from being damaged by the acute angle portion. The trapezoidal cores 72 to 75 have the long bottom side and the short bottom side aligned vertically between the four rounds of the same step of the bellows structure 20, and the vertical direction of the long bottom side and the short bottom side is switched for each step. Yes. Further, the cores 72 to 75 have the long bottom side on the lower side in the lowermost fold and the long bottom side on the upper side in the uppermost fold. That is, the bellows structure 20 has a pair of pleats composed of a lower fold having the long bottom sides of the cores 72 to 75 on the lower side and an upper fold having the long bottom sides on the upper side, but a plurality of steps (5 in the example of FIG. 5). It has a structure that is stacked in steps.

  The front and back fabrics 71 are sewn along the upward long bottom sides of the cores 72 to 75 disposed on the uppermost folds and the downward long bottom sides of the cores 72 to 75 disposed on the lowermost folds, Furthermore, it is sewn along the gap | interval of the mutually opposing bottom sides of the cores 72-75 adjacent up and down. The cloth 71 on the front and back sides is further sewn along the four oblique sides of the core forming the rhombus region 77 without the cores 72 to 75. In addition, fabrics 71 on the front and back sides are sewn along a cross-shaped line passing through the center of the rhombus region 77, that is, a line that crosses left and right and a line that cuts vertically. The line that runs vertically is equivalent to the boundary line between the four circles.

  FIG. 5 also corresponds to a process diagram showing one process of manufacturing the bellows structure 20. The bellows structure 20 is completed by stitching a seam allowance between the left side end (left end in FIG. 5) and the front end (right end in FIG. 5). In addition, the bellows structure 20, the connecting portion 45, and the fastener 40 are connected by sewing the seam allowance portion between the upper end portion of the fabric 71 and the connecting portion 45 and the lower end portion of the fastener 40. Furthermore, the bellows structure 20 and the lower bag body 10 are connected by sewing a seam allowance portion between the lower end portion of the fabric 71 and the upper end portion of the lower bag body 10. The stitches of these seams may be sewn at the same time by the sewing thread 76 that stitches the cloth 71 on the front and back, or may be sewn by another sewing thread.

  6A and 6B are perspective views showing a change in shape accompanying expansion and contraction of the bellows structure 20, wherein FIG. 6A shows a state in which the bellows structure is extended, FIG. 6B shows a state in which the bellows structure is contracted to some extent, and FIG. The state which folded the bellows structure was each shown. In FIG. 6, two folds 21 to 24 adjacent to each other on the upper and lower sides and the right and left sides are shown as representative of the bellows structure 20. Of the two folds 21 to 24, the left pleats 21 and 22 are provided with, for example, the wick 73 of the wicks 72 to 75 shown in FIG. 74 is arranged. In FIG. 5, the upper and lower folds 21 and 22 correspond to a pair of pleats including a lower fold having the long bottom side of the core 73 on the lower side and an upper fold having the long bottom side on the upper side. Similarly, in FIG. 5, the two folds 23 and 24 correspond to a pair of pleats including a lower fold having the long bottom side of the core 74 on the lower side and an upper fold having the long bottom side on the upper side. The sheet-like cores 73 and 74 give the pleats 21 to 24 a certain rigidity. Thereby, the shape of each of the pleats 21 to 24 is maintained.

  At the boundary between the pair of upper and lower pleats 21 and 22, the short bottom sides of the core 73 face each other. Similarly, at the boundary between the pair of upper and lower pleats 23 and 24, the short bottom sides of the core 74 face each other. The contraction of the bellows structure 20 is realized by retreating these facing boundaries inward. Since the sheets 73 and 74 have a trapezoidal shape, a rhombus region 77 without the cores 73 and 74 remains in the fabric 71 as shown in FIG. As shown in FIGS. 6A and 6B, the rhombus region 77 forms a continuous region between a pair of upper and lower steps at the corners of the four corners of the bellows structure 20. It consists of four triangular areas: an end 25, an end 26 of the fold 22, an end 27 of the fold 23, and an end 28 of the fold 24.

  When the bellows structure 20 contracts, the rhombus region 77 bends outward with respect to the cored folds 21-24. That is, the end portion 25 bends outward from the remaining portion of the pleat 21, and the end portion 26 bends outward from the remaining portion of the pleat 22. Further, the end portion 27 is bent outward from the remaining portion of the fold 23, and the end portion 28 is bent outward from the remaining portion of the fold 24. Then, with the contraction of the bellows structure 20, the end portion 25 and the end portion 27 adjacent to each other on the left and right approach each other, and the end portion 26 and the end portion 28 adjacent to each other on the left and right approach each other. At the same time, as indicated by a right-pointing arrow in FIGS. 6A and 6B, the rhombus region 77 bends to the right side in the drawing, for example. That is, the end 25 and the end 26 adjacent to each other in the vertical direction are bent so that the boundaries thereof recede inward, and the end 27 and the end 28 adjacent to each other in the upper and lower directions have their boundaries outward. Bend to move forward. When the bellows structure 20 is folded as shown in FIG. 6C, the angle between the long bottom sides of the trapezoidal sheet-like cores 73 and 74 arranged on the pleats 21 to 24 and both oblique sides is about 45 degrees. Since the end portions 25 to 28 of the four surfaces substantially overlap each other, the rhombus region 77 is folded between the upper and lower folds 23 and 24 in a state bent to the right side. Further, the trapezoidal sheet-shaped cores 73 and 74 have an angle between the long bottom side and the two oblique sides of about 45 degrees, so that when the bellows structure 20 is folded, the rigidity formed by the core 73 of the pleat 21 is increased. It can be avoided that the portion having the end portion 25 excluding the end portion and the portion having the rigidity modeled by the core 74 of the adjacent pleat 23, that is, the portion excluding the end portion 27 overlap each other. The same applies to the pleats 22 and 24. When the bellows structure 20 is extended, the above process is reversed.

  As described above, the bellows structure 20 can be folded in a state where the shape of the bellows structure 20 can be expanded and contracted with good reproducibility and the overlapping of the folds 21 to 24 is orderly. In addition, about the crease | fold formed in each part when folding the bellows structure 20, the position of a crease can be determined from the beginning by attaching a crease in advance by ironing etc. in the manufacturing process of the bag 101. It is. In particular, it is possible to determine whether the bending direction of the rhombus region 77 is the right side or the left side.

In the bellows structure 20, the front and back fabrics 71 are stitched together by the sewing thread 76 along all the lines where folds are formed when folded. That is, the sewing thread is any of the boundary between the folds 21 and 22, the boundary between the folds 23 and 24, the periphery of the rhombus region 77, and the boundary forming a cross that divides the rhombus region 77 into four triangular regions 25 to 28. The fabric 71 on the front and back sides is stitched together by 76. Thereby, not only the positions of the cores 72 to 75 in the fabric 71 are constrained, but also when the bellows structure 20 is folded, the fabrics 71 on the front and back sides are not separated from each other along the sewing thread 76, and a crease is formed properly. Is done. In particular, since the front and back fabrics 71 are sewn together by the sewing thread 76, the crease is sharp and the appearance is beautiful.

(Other embodiments)
(1) In the bellows structure 20, as described above, the front and back fabrics 71 are stitched together by the sewing thread 76 along the crease formed when folded. On the other hand, instead of the sewing thread 76, the front and back fabrics 71 may be fixed to each other by other means such as adhesion. Even in this case, the front and back fabrics 71 are not separated from each other along the crease, so that a proper crease without disturbance is formed. In particular, when bonding using an adhesive, it is easy to fix the fabrics 71 on the front and back sides, and the manufacturing process is simplified. Further, not only along the crease but also over the entire region without the cores 72 to 76, the front and back fabric 71 can be fixed with an adhesive or the like.

  (2) In the bellows structure 20, for each of the cores 72 to 75, the entire region or a part of the cores 72 to 75 is fixed to the cloth 71 on the front and back with an adhesive, etc. You may be restrained. It is also possible to fix the cores 72 to 75 to the cloth 71 on the front and back sides by providing holes in the cores 72 to 75 and passing a sewing thread through the holes. Thus, when taking a separate means to constrain the positions of the cores 72 to 75 in the fabric 71, the fabric 71 on the front and back sides does not need to be fixed along the crease formed when folded. There is no problem in restraining the positions of the cores 72 to 75.

  (3) In the bag 101, the bellows structure 20 is connected to the lower bag body 10, so that a certain amount of volume is secured inside the bag 101 even when the bellows structure 20 is folded. On the other hand, the bottom surface of the bag 101 may be connected to the lower end of the bellows structure 20 instead of the lower bag body 10 so that the body of the bag 101 is entirely constituted by the bellows structure 20. In addition, a rectangular cylindrical upper bag body may be connected to the upper end of the bellows structure 20, and the bellows structure 20 may be connected between the upper bag body and the lower bag body 10.

  (4) In the bag 101, the cores 11 to 15 and 35 are disposed between the front and back fabrics 18 and 31 in the lower bag body 10 and the lid body 30 as well as the bellows structure 20. As a result, the bag 101 as a whole has a uniform appearance. On the other hand, the lower bag body 10 and the lid body 30 may have other configurations such as using thick leather having a certain rigidity without the cores 11 to 15 and 35.

  (5) The rectangular cores 11 to 15 of the lower bag body 10, the rectangular core 35 of the lid body 30, and the rectangular core 37 of the connecting portion 45 may also be rounded at the four corners. Thereby, it is possible to prevent damage to the fabrics 18, 31, and 36 due to these four even numbers.

  (6) In the bag 101, the fastener 40 is used so that the lid 30 can be opened and closed. On the other hand, conventionally known various means can be used as means for enabling the lid 30 to be opened and closed. For example, the lid 30 may be opened and closed by providing a pair of hooks around the lid 30 and the upper end of the bellows structure 20 at one or more locations. Alternatively, a lid is attached to the lid 30, a button insertion slit is provided at the end of the belt, and a button is provided at the upper end of the bellows structure 20, so that the lid 30 can be opened and closed by button fastening. Also good.

  (7) In the above embodiment, the bellows structure 20 is exemplified as a part constituting the body of the bag 101. However, the bellows structure 20 can be used not only for bags but also for various applications. For example, by using a light-transmitting vinyl sheet as the fabric 71 of the bellows structure 20, and using a light-transmitting plastic sheet as the cores 72 to 75, the bellows structure 20 can be used as the trunk of the lantern. .

  (8) In the above embodiment, the upper opening of the lower bag body 10 to which the bellows structure 20 is connected opens horizontally. On the other hand, you may form the lower bag body 10 so that the said upper opening part may incline some forwards. Such forms are also within the scope of the present invention. With this configuration, when the bellows structure 20 is folded, the upper opening portion of the bellows structure 20 covered with the lid 30 is also tilted forward, so that it is easy to load and unload the items from the bag 101. Even if the upper opening of the lower bag body 10 is tilted forward, there is no problem in extending the bellows structure 20 vertically unless the forward tilt angle is excessive. An appropriate forward tilt angle is, for example, about 5 to 15 degrees.

DESCRIPTION OF SYMBOLS 10 Lower bag body 20 Bellows structure 30 Lid body 40 Fastener 60 Support member 71 Fabric 72-75 Core 76 Sewing thread
90 props 101 bags 150 carts

Claims (8)

A bag having a rectangular cylindrical bellows structure on a body portion;
The bellows structure can be vertically expanded and contracted by having a bellows shape on the four sides, and has a sheet-like core between the front and back fabrics of the four times,
The sheet-like core is a trapezoidal shape that is arranged for each accordion fold of each of the four circumferences, the position of which is constrained, and the angle between the long bottom side and both oblique sides forms about 45 degrees,
The trapezoidal sheet-shaped core has the long bottom side and the short bottom side aligned vertically between the four rounds of the same step of the bellows, and the vertical direction of the long bottom side and the short bottom side is switched for each step ,
The trapezoidal sheet-shaped core has a long bottom side on the lower side in the lowermost fold, and a long base side on the upper side in the uppermost fold,
A line that traverses the hypotenuse of the trapezoidal sheet-shaped core, a line that passes through the center of the fabric region surrounded by the four hypotenuses of the trapezoidal sheet-shaped core, vertically and horizontally, and the trapezoidal sheet-shaped core each other A bag in which the fabrics on the front and back are stitched together along the gap between the bottoms facing each other.   The bag according to claim 1, wherein each of the trapezoidal cores has a rounded corner at a corner between the long bottom side and both oblique sides. It is no upper portion of the bellows structure, the bag according to the upper portion than the support member for slidably supported vertically the posts for carrying bag, to claim 1 or 2 further comprising. The bag further includes a box-shaped lower bag body,
The bellows structure is formed connected to the lower bag body,
The said bag is a cover body connected on the said bellows structure, Comprising: The cover body which covers the opening part of the said bellows structure so that opening and closing is possible further, The bag in any one of Claim 1 thru | or 3 bag. The said lower bag body is a bag of Claim 4 which has a sheet-like 2nd core between the cloth of the front and back of a bottom face, a front surface, a back surface, and both sides. The bag according to claim 4 or 5 , wherein the lid has a sheet-like third core between at least the top and bottom fabrics. A rectangular cylindrical bellows structure,
The bellows structure can be vertically expanded and contracted by having a bellows shape on the four sides, and has a sheet-like core between the front and back fabrics of the four times,
The sheet-like core is a trapezoidal shape that is arranged for each accordion fold of each of the four circumferences, the position of which is constrained, and the angle between the long bottom side and both oblique sides forms about 45 degrees,
The trapezoidal sheet-shaped core has the long bottom side and the short bottom side aligned vertically between the four rounds of the same step of the bellows, and the vertical direction of the long bottom side and the short bottom side is switched for each step ,
The trapezoidal sheet-shaped core has a long bottom side on the lower side in the lowermost fold, and a long base side on the upper side in the uppermost fold,
A line that traverses the hypotenuse of the trapezoidal sheet-shaped core, a line that passes through the center of the fabric region surrounded by the four hypotenuses of the trapezoidal sheet-shaped core, vertically and horizontally, and the trapezoidal sheet-shaped core each other A bellows structure in which the fabrics on the front and back sides are sewn together along the gap between the bottoms facing each other . The bellows structure according to claim 7 , wherein each of the trapezoidal cores has a rounded corner between the long bottom side and both oblique sides.

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