Bag and manufacturing method of bag

Abstract

To provide a bag hard to lose shape and usable for a long time, and a manufacturing method of the bag.SOLUTION: An aspect of the present invention is a bag 1 including a bag body 10 formed of leather and a handle part 20. The bag body 10 includes: a front portion 11 bent integrally from a front surface to right and left both side surfaces; a rear portion 12 bent integrally from a back surface to right and left side surfaces; a bottom surface portion 13 constituting a bottom surface; a left side joint portion 51 connecting the front portion 11 and the rear portion 12 in a left side surface; a right side joint portion 52 connecting the front portion 11 and the rear portion 12 in a right side surface; and a bottom side connection portion 53 connecting edges on a side of a bottom surface of each of the front portion 11 and the rear portion 12 and the bottom surface portion 13. The handle part 20 has: a first handle portion 21 attached so as to straddle above a storage space 100; and a second handle portion 22 attached so as to be straddle above the storage space 100 and cross with the first handle portion 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bag that is resistant to deformation and can be used for a long time, and a method for manufacturing the bag. [Background technology]

[0002] Patent Document 1 discloses a bag equipped with a simple belt fastening structure that firmly fastens the belt while preventing damage to the stitched fastening portion. The belt fastening structure used in this bag has a fastening portion structure where a fabric body and a belt body are fastened, and the fastening portion includes a fastening stitch portion that overlaps and fastens the fabric body and the belt body, and a reinforcing stitch portion that overlaps and fastens the fabric body and the belt body in the direction of the unfastened portion of the belt body adjacent to the fastening stitch portion and reinforces the fastening stitch portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-087766 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, bags such as handbags and shoulder bags have a handle attached to the bag body, which has a storage space, and acts as a handle or strap. When luggage is placed inside the bag and the handle is held, the weight of the luggage is concentrated at the attachment point of the handle. For this reason, it is necessary to prevent the bag from losing its shape when held with luggage inside, and to also give sufficient consideration to the durability of the attachment point of the handle.

[0005] The present invention has been made in view of the above circumstances, and its object is to provide a bag that is resistant to deformation and can be used for a long time, and a method for manufacturing the bag. [Means for solving the problem]

[0006] One aspect of the present invention is a bag comprising a leather bag body having a front, back, bottom, and left and right sides that define an internal storage space, and a handle portion attached to the bag body, wherein the bag body has a front body portion that is bent integrally from the front to both the left and right sides, a back body portion that is bent integrally from the back to both the left and right sides, a bottom portion that forms the bottom, a left-side joint portion that connects the front body portion and the back body portion at the left side, a right-side joint portion that connects the front body portion and the back body portion at the right side, and a bottom joint portion that connects the bottom edges of the front body portion and the back body portion to the bottom portion, and the handle portion has a first handle portion attached so as to straddle the top of the storage space, and a second handle portion attached so as to straddle the top of the storage space and intersect with the first handle portion.

[0007] With this configuration, of the four points of force acting on the bag body when holding the handle, the two points of force acting on both ends of the first handle portion and the two points of force acting on both ends of the second handle portion are diagonally aligned, so by holding both the first and second handle portions, the bag body is lifted up at four diagonal points, allowing the bag to be held in a well-balanced manner.

[0008] Preferably, the bag body has a generally rectangular upper peripheral edge that defines the upper opening of the storage space, and when the four corners of the upper peripheral edge are designated in order around one side as a first corner, a second corner, a third corner, and a fourth corner, one end of the first handle portion is connected to the first corner and the other end is connected to the third corner, and one end of the second handle portion is connected to the second corner and the other end is connected to the fourth corner. Thus, by holding both the first handle portion and the second handle portion, the bag can be lifted diagonally from the four corners of the generally rectangular upper peripheral edge of the bag body, allowing the bag to be held in a balanced manner.

[0009] Preferably, the one end and the other end of the first handle portion and the one end and the other end of the second handle portion each have an attachment piece that straddles two adjacent faces that form the corner of the upper peripheral edge and is connected to the two faces, thereby reliably connecting the ends of the first handle portion and the second handle portion so that the corners are sandwiched between the attachment pieces.

[0010] Preferably, the left joining portion has a left sewing region where the front body portion and the rear body portion are sewn together in the vertical direction at the center of the left side surface of the bag body, and the right joining portion has a right sewing region where the front body portion and the rear body portion are sewn together in the vertical direction at the center of the right side surface of the bag body. As a result, the front body portion and the rear body portion are sewn together in the vertical direction at the center of the left and right sides of the bag body, and the storage space of the bag body is firmly formed.

[0011] Preferably, the bottom connecting portion has a bottom sewing area where the edge on the bottom surface side is sewn all around, and the bottom sewing area overlaps with the lower end of the left sewing area and the lower end of the right sewing area, so that the lower end of the left sewing area and the lower end of the right sewing area are each doubly sewn with the bottom sewing area.

[0012] Preferably, the bag body is symmetrical when viewed from the front, allowing the bag to be held in a balanced manner by the handle portion.

[0013] Another aspect of the present invention is a method for manufacturing a bag, comprising: a first step of shaping a front body portion, a back body portion, and a bottom portion each made of leather; a second step of sewing together both side edges of the front body portion shaped in the first step and both side edges of the back body portion; a third step of sewing together the bottom edges of the front body portion and the back body portion sewn in the second step and the bottom portion to form a bag body having a storage space; and a fourth step of attaching two handle portions so that they cross each other and straddle the storage space of the bag body. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a bag that is resistant to deformation and can be used for a long time, and a method for manufacturing the bag. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view illustrating a bag according to this embodiment. [Figure 2] FIG. 2 is a front view illustrating the bag according to this embodiment. [Figure 3] FIG. 3 is a side view illustrating the bag according to this embodiment. [Figure 4] FIG. 4 is a plan view illustrating the bag according to this embodiment. [Figure 5] FIG. 5 is a perspective view illustrating an example of the mounting piece. [Figure 6] FIG. 6 is a flowchart illustrating a method for manufacturing a bag according to this embodiment. [Figure 7] FIG. 7 is a plan view illustrating the first step. [Figure 8] FIG. 8 is a perspective view illustrating the second step. [Figure 9] FIG. 9 is a perspective view illustrating the third step. [Figure 10] FIG. 10 is a perspective view illustrating the fourth step. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same components will be designated by the same reference numerals, and the description of components that have already been described will be omitted as appropriate.

[0017] (Bag composition) FIG. 1 is a perspective view illustrating a bag according to this embodiment. FIG. 2 is a front view illustrating the bag according to this embodiment. FIG. 3 is a side view illustrating the bag according to this embodiment. FIG. 4 is a plan view illustrating the bag according to this embodiment.

[0018] As shown in FIGS. 1 to 4, the bag 1 according to this embodiment comprises a leather bag body 10 and a handle 20 attached to the bag body 10. The bag body 10 has a front surface 10a, a back surface 10b, a left side surface 10c, a right side surface 10d, and a bottom surface 10e that define an internal storage space 100. The bag body 10 is, for example, box-shaped. Note that the bag body 10 is not limited to a box shape and may be cylindrical, elliptical, or polygonal. However, from the viewpoint of improving balance when holding the bag 1 by the handle 20 (described below), a symmetrical shape is preferable. In this embodiment, a box-shaped (square) bag body 10 will be described as an example.

[0019] The bag body 10 has a front body part 11 that is integrally bent from the front face 10a to both the left side face 10c and the right side face 10d, a back body part 12 that is integrally bent from the back face 10b to both the left side face 10c and the right side face 10d, and a bottom face part 13 that forms the bottom face 10e.

[0020] When viewed from above, the front body section 11 and the back body section 12 are each constructed by folding both ends of a single member and butting the folded ends together. This provides a gusset for the bag body 10, ensuring a box-shaped storage space 100. On the left side 10c of the bag body 10, the portion where the folded ends of the front body section 11 and the back body section 12 butt together forms a left-side joint 51 where they are connected. On the right side 10d of the bag body 10, the portion where the folded ends of the front body section 11 and the back body section 12 butt together forms a right-side joint 52 where they are connected.

[0021] The left joining portion 51 has a left sewing region 51a where the front body portion 11 and the back body portion 12 are sewn together in the vertical direction at the center of the left side surface 10c of the bag body 10. The right joining portion 52 has a right sewing region 52a where the front body portion 11 and the back body portion 12 are sewn together in the vertical direction at the center of the right side surface 10d of the bag body 10. As a result, the front body portion 11 and the back body portion 12 are sewn together in the vertical direction at the center of each of the left side surface 10c and the right side surface 10d of the bag body 10, and the storage space 100 of the bag body 10 is firmly formed.

[0022] In addition, bottom surface portions 13 are connected to the edges of the front body portion 11 and the back body portion 12 on the side of the bottom surface 10e. The portions connecting the front body portion 11 and the back body portion 12 to the bottom surface portion 13 are bottom connecting portions 53.

[0023] The bottom connection portion 53 has a bottom sewing region 53a that is sewn around the entire periphery of the edges on the bottom surface 10e of the front body portion 11 and the back body portion 12. This bottom sewing region 53a preferably overlaps the bottom end of the left sewing region 51a and the bottom end of the right sewing region 52a. As a result, the bottom sewing region 53a double-stitches the bottom end of the left sewing region 51a and the bottom end of the right sewing region 52a, allowing the box-shaped form of the bag body 10 to be firmly constructed.

[0024] The front body portion 11, the back body portion 12, and the bottom portion 13 are preferably made of multiple layers of leather. In this case, the front body portion 11 and the back body portion 12 may have an outer layer of a material other than leather, such as PVC, and an inner layer of leather, or both layers may be leather. The bottom portion 13 is made of more than these layers, for example, three layers of leather. By making the front body portion 11 and the back body portion 12 have fewer layers than the bottom portion 13, it is possible to make the bag easier to fold and reduce the weight of the bag body 10. On the other hand, by making the bottom portion 13 have more layers than the front body portion 11 and the back body portion 12, it is possible to increase the strength of the bottom surface 10e when luggage is placed in the storage space 100.

[0025] The handle portion 20 has a first handle portion 21 and a second handle portion 22. The first handle portion 21 is attached to the bag body 10 so as to straddle the upper part of the storage space 100.

[0026] Additionally, second handle portion 22 is attached to bag body 10 so as to straddle the upper part of storage space 100 and intersect with first handle portion 21. That is, when viewed from above, first handle portion 21 and second handle portion 22 are attached to bag body 10 in a manner that intersects with each other (see FIG. 4). As a result, by holding both first handle portion 21 and second handle portion 22, bag body 10 is lifted at four diagonal points, allowing bag 1 to be held in a well-balanced manner.

[0027] In this embodiment, the bag body 10 has a substantially rectangular upper peripheral edge 101 that forms the upper opening of the storage space 100. If the four corners of this upper peripheral edge 101 are designated in order from above as a first corner c1, a second corner c2, a third corner c3, and a fourth corner c4, one end 21a of the first handle portion 21 is connected to the first corner c1, and the other end 21b is connected to the third corner c3 (the diagonal corner of the first corner c1). Furthermore, one end 22a of the second handle portion 22 is connected to the second corner c2, and the other end 22b is connected to the fourth corner c4 (the diagonal corner of the second corner c2). In this way, end 21a and end 21b of first handle portion 21 are connected to each other at diagonal corners of upper peripheral edge 101, and end 22a and end 22b of second handle portion 22 are connected to each other at another diagonal corner of upper peripheral edge 101. As a result, when first handle portion 21 and second handle portion 22 are held with their intersecting portions overlapping, the diagonal corners are lifted up against the four corners of the approximately rectangular upper peripheral edge 101 of bag body 10, allowing bag 1 to be held in a balanced manner.

[0028] Furthermore, when the handle portion 20 of the bag 1 is held, a load is applied from the ends 21a, 22b of the first handle portion 21 and the ends 22a, 22b of the second handle portion 22 to the four corners of the upper peripheral edge portion 101. This load is distributed to each of the left side surface 10c and the right side surface 10d, and is then transmitted through these to the bottom surface portion 13. The left side surface 10c is provided with a left joint portion 51, and the right side surface 10d is provided with a right joint portion 52, providing sufficient reinforcement, and deformation can be prevented even if the load is transmitted to the left side surface 10c and the right side surface 10d.

[0029] Furthermore, as shown in FIG. 2, when viewed from the front, the load points from the handle 20 are the upper left and right corners of the rectangular bag body 10, and the load is transmitted from the left side 10c and right side 10d to the left and right ends of the bottom 10e. In other words, the transmission path of the load from the end of the handle 20 to the bag body 10 is a symmetrical rectangle. When the load transmission path is a symmetrical rectangle like this, the balance when holding the handle 20 is excellent. In horse riding analogy, this is the same as how excellent control of the horse is achieved when the connection position between the bit attached to the horse and the left and right reins, and the position of the left and right rein holders, are rectangular.

[0030] In addition, one end 21a and the other end 21b of the first handle portion 21, and one end 22a and the other end 22b of the second handle portion 22 each have an attachment piece 201 that spans two adjacent surfaces that form the corners of the upper peripheral portion 101 and is connected to these two surfaces.

[0031] FIG. 5 is a perspective view illustrating an example of the mounting piece. FIG. 5 shows the attachment piece 201 provided on one end 21a of the first handle portion 21, but the attachment pieces 201 provided on the other ends 21b, 22a, and 22b are similar. The attachment piece 201 is, for example, a wide portion provided on the end 21a of the first handle portion 21, spanning the front surface 10a and the left side surface 10c that form the first corner c1 and connecting to these surfaces. The attachment piece 201 is connected to the front surface 10a and the left side surface 10c while being bent into a substantially L-shape at the first corner c1. The attachment piece 201 may be connected by adhesive, sewing, or both. By connecting the attachment pieces 201 so as to sandwich the corners in this manner, the ends 21a and 21b of the first handle portion 21 and the ends 22a and 22b of the second handle portion 22 can be securely attached to the four corners of the upper peripheral edge 101.

[0032] From the standpoint of strength and design, it is preferable that the attachment pieces 201 are provided integrally with the ends 21a, 21b of the first handle portion 21 and the ends 22a, 22b of the second handle portion 22, respectively, but they may also be attached as separate pieces. Also, it is preferable that the attachment pieces 201 are attached to the bag body 10 by sewing. This allows for easy repair when replacing the handle portion 20 by undoing the sewn parts of the attachment pieces 201.

[0033] (Bag manufacturing method) FIG. 6 is a flowchart illustrating a method for manufacturing a bag according to this embodiment. First, as shown in step S101, the front body portion 11, the back body portion 12, and the bottom portion 13 made of leather are each formed (first step). FIG. 7 is a plan view illustrating the first step. In this embodiment, for example, two layers of leather are molded into a generally trapezoid shape to form the front body portion 11 and the back body portion 12. Also, for example, three layers of leather are molded into a generally rectangular shape to form the bottom portion 13. Furthermore, the first handle portion 21 and the second handle portion 22 are formed as elongated pieces with attachment pieces 201 on both ends. When manufacturing a symmetrical bag 1, the front body portion 11 and the back body portion 12 are each bilaterally symmetrical, and the front body portion 11 and the back body portion 12 have the same shape. Furthermore, the first handle portion 21 and the second handle portion 22 are each bilaterally symmetrical, and the first handle portion 21 and the second handle portion 22 have the same shape.

[0034] Next, as shown in step S102, both side edges of the front body section 11 and both side edges of the back body section 12 formed in the previous step S101 are joined by sewing (second step). FIG. 8 is a perspective view illustrating the second step. In the second step, first, as shown in FIG. 8(a), both side edges of the formed front body section 11 and both side edges of the back body section 12 are folded and positioned so that the both side edges are butted together. Next, as shown in FIG. 8(b), both butted ends are sewn together from top to bottom. This forms a left sewn region 51a and a right sewn region 52a in the vertical direction in the center portions of the left side surface 10c and the right side surface 10d of the bag body 10, respectively.

[0035] Next, as shown in step S103, the bottom edges of the front body portion 11 and the back body portion 12 sewn in the previous step S102 are joined to the bottom portion 13 by sewing, thereby forming the bag body 10 having the storage space 100 (third step). FIG. 9 is a perspective view illustrating the third step. In the third step, first, as shown in FIG. 9(a), the bottom portion 13 is aligned with the bottom sides of the front body portion 11 and the back body portion 12 sewn in the second step. Next, as shown in FIG. 9(b), the bottom portion 13 is joined by sewing to the bottom edges of the front body portion 11 and the back body portion 12. This forms the bottom sewn region 53a. This sewing is performed around the entire bottom edge of the front body portion 11 and the back body portion 12, so the lower end of the left sewing area 51a and the lower end of the right sewing area 52a overlap with the bottom sewing area 53a, and this overlapping area is sewn twice.

[0036] Then, as shown in step S104, the first handle portion 21 and the second handle portion 22 are attached to the bag body 10 so that they cross each other and straddle the upper part of the storage space 100 (fourth step). FIG. 10 is a perspective view illustrating the fourth step. In the fourth step, first, as shown in FIG. 10(a), one end 21a of the first handle portion 21 is attached to a first corner c1 of the upper peripheral edge portion 101 of the bag body 10 using an attachment piece 201. Next, the other end 21b of the first handle portion 21 is attached to a third corner c3 diagonally opposite the first corner c1 using the attachment piece 201. Next, as shown in FIG. 10(b), one end 22a of the second handle portion 22 is attached to a second corner c2 of the upper peripheral edge portion 101 of the bag body 10 using the attachment piece 201. Next, the other end 22b of second handle portion 22 is attached to fourth corner c4 diagonally opposite second corner c2 using attachment piece 201. As a result, first handle portion 21 and second handle portion 22 are attached so as to cross each other and straddle the storage space 100. In this way, bag 1 is completed.

[0037] As described above, according to this embodiment, it is possible to provide a bag that is resistant to deformation and can be used for a long time, and a method for manufacturing such a bag.

[0038] Although the present embodiment and its application examples have been described above, the present invention is not limited to these examples. For example, the shape and size of the bag body 10 and the shape and size (length) of the handle portion 20 are not limited to those described above. Furthermore, those embodiments or application examples in which a person skilled in the art appropriately adds, deletes, or modifies components, or appropriately combines features of each embodiment, are also included within the scope of the present invention as long as they include the gist of the present invention. [Explanation of symbols]

[0039] 1...bag, 10...bag body, 10a...front, 10b...back, 10c...left side, 10d...right side, 10e...bottom, 11...front body portion, 12...back body portion, 13...bottom portion, 20...handle portion, 21...first handle portion, 21a...end portion, 21b...end portion, 22...second handle portion, 22a...end portion, 22b...end portion, 51...left joint portion, 51a...left sewing area, 52...right joint portion, 52a...right sewing area, 53...bottom connection portion, 53a...bottom sewing area, 100...storage space, 101...upper peripheral portion, 201...attachment piece, c1...first corner portion, c2...second corner portion, c3...third corner portion, c4...fourth corner portion

Claims

1. A leather bag body having a front, back, bottom, and left and right sides that define an internal storage space; A handle portion attached to the bag body; A bag comprising: The bag body is a front body portion that is integrally bent from the front to both the left and right sides; a back body portion that is integrally bent from the back to both the left and right sides; a bottom surface portion constituting the bottom surface; a left joining portion that connects the front body portion and the back body portion on the left side surface; a right joint portion that connects the front body portion and the back body portion on the right side surface; a bottom connection portion connecting the bottom edge of each of the front body portion and the back body portion to the bottom portion, The handle portion is a first handle portion attached so as to straddle an upper portion of the storage space; a second handle portion that straddles the upper portion of the storage space and is attached so as to intersect with the first handle portion.

2. The bag body has a generally rectangular upper peripheral edge portion that defines an upper opening of the storage space, When the four corners of the upper peripheral portion are designated in order around one side as a first corner, a second corner, a third corner, and a fourth corner, one end of the first handle portion is connected to the first corner and the other end is connected to the third corner; 2. The bag of claim 1, wherein one end of the second handle portion is connected to the second corner and the other end is connected to the fourth corner.

3. 3. The bag according to claim 2, wherein the one end and the other end of the first handle portion and the one end and the other end of the second handle portion each have an attachment piece that spans two adjacent faces that form the corners of the upper peripheral edge and is connected to the two faces.

4. the left joining portion has a left sewing region where the front body portion and the rear body portion are sewn together in the vertical direction at a central portion of the side surface on the left side of the bag body, The bag according to claim 1 , wherein the right joining portion has a right sewing region where the front body portion and the rear body portion are sewn together in the vertical direction at a center portion of the right side surface of the bag body.

5. The bottom connection portion has a bottom sewing area where the edge on the bottom surface side is sewn around the entire periphery, The bag according to claim 4 , wherein the bottom sewn area overlaps with a lower edge of the left sewn area and a lower edge of the right sewn area.

6. The bag according to claim 5 , wherein the bag body is bilaterally symmetrical when viewed from the front.

7. A method for manufacturing a bag, A first step of forming a front body portion, a back body portion, and a bottom portion each made of leather; a second step of joining both side edges of the front body portion and both side edges of the back body portion formed in the first step by sewing; a third step of joining the bottom edges of the front body portion and the back body portion sewn in the second step to the bottom portion by sewing to form a bag main body having a storage space; a fourth step of attaching the two handle portions to the bag body so that they cross each other and straddle the upper part of the storage space; A method for manufacturing a bag comprising the steps of:

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