Bag

Abstract

To provide a bag capable of increasing the capacity of a housing space within the bag.SOLUTION: A bag 1 includes: a canopy part 2; a first side surface part 3; a second side surface part 4; a third side surface part 5; a fourth side surface part 6; a bottom surface part 7; a first zipper F1; a second zipper F2; a third zipper F3; a first expansion part 8; a second expansion part 9; a first grip part 10; and a second grip part 11. The bottom surface part 7 has thin-walled parts 15a and 15b that extend in a linear manner.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a bag that can be suitably embodied as, for example, a Boston bag. [Background technology]

[0002] A conventional bag is described in, for example, Patent Document 1. This conventional Boston bag comprises a box-shaped bag base having an opening, and a canopy connected to the periphery of the opening of the bag base by a two-way fastener. Handles are fixed to the front and back components of the bag base near the upper edges, respectively, and shoulder belt attachment portions are provided on the left and right side components of the bag base. The document describes a configuration in which the bag can be used as a tote bag by fully opening the two-way fastener and moving the canopy to the inside of the bag base. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3145204 Summary of the Invention [Problem to be solved by the invention]

[0004] The bag of the prior art of the above-mentioned Patent Document 1 does not have a structure that can increase the volume that can store objects. Therefore, there is a demand for a bag that can increase the volume when the number of objects increases. Furthermore, the bag of the prior art does not have a structure that can be folded and made compact. Therefore, there is a demand for a bag that can be folded and made compact when not in use. [Means for solving the problem]

[0005] The present invention relates to a rectangular canopy having two band-shaped portions, A first side portion connected to one long side portion of the canopy portion; A second side portion connected to the other long side portion of the canopy portion; A third side portion connected to one short side portion of the canopy portion; A fourth side portion connected to the other short side portion of the canopy portion; a bottom surface portion connected to the first side surface portion and the second side surface portion; a first extension portion connected between one end of the first side surface portion closer to the third side surface portion and one end of the third side surface portion closer to the first side surface portion, between one short side portion of the bottom surface portion and one end of the third side surface portion closer to the bottom surface portion, and between one end of the second side surface portion closer to the third side surface portion and the other end of the third side surface portion closer to the second side surface portion; a second extension portion connected between the other end of the first side surface portion closer to the fourth side surface portion and one end of the fourth side surface portion closer to the first side surface portion, between the other short side portion of the bottom surface portion and the other end of the fourth side surface portion closer to the bottom surface portion, and between the other end of the fourth side surface portion closer to the second side surface portion and the other end of the second side surface portion closer to the fourth side surface portion; a first fastener connecting the two strip portions in parallel; a second fastener provided to surround the first extension portion and connecting between the one end of the first side surface portion and the one end of the third side surface portion, between the one short side portion of the bottom surface portion and the one end of the third side surface portion, and between the other end of the third side surface portion and the one end of the second side surface portion; a third fastener provided to surround the second extension portion and connecting between the other end of the first side portion and the one end of the fourth side portion, between the other short side portion of the bottom portion and the other end of the fourth side portion closer to the bottom portion, and between the other end of the fourth side portion closer to the second side portion and the other end of the second side portion closer to the fourth side portion; A first gripping portion having both ends connected to the first side surface portion; A second gripping portion having both ends connected to the second side portion; The bag is characterized by including a thin-walled portion provided on the bottom surface portion and extending linearly.

[0006] The present invention also provides a roof structure comprising a rectangular canopy having two band-shaped portions, A first side portion connected to one long side portion of the canopy portion; A second side portion connected to the other long side portion of the canopy portion; A third side portion connected to one short side portion of the canopy portion; A fourth side portion connected to the other short side portion of the canopy portion; a bottom surface portion connected to the first side surface portion and the second side surface portion; a fastener for connecting the two strip portions in parallel; a band-shaped grip portion having one end connected to the third side surface portion and the other end connected to the fourth side surface portion; The bag is characterized by including a thin-walled portion provided on the bottom surface portion and extending linearly.

[0007] The present invention is also characterized in that the bottom portion includes an outer sheet, an inner sheet laminated to the outer sheet, and a core material interposed between the outer sheet and the inner sheet. Effect of the Invention

[0008] According to the present invention, the bag includes a canopy portion, a first side portion, a second side portion, a third side portion, a fourth side portion, a bottom portion, a first fastener, a second fastener, a third fastener, a first extension portion, a second extension portion, a first grip portion, and a second grip portion. By opening the second fastener, the third side portion is released from the restrained state with respect to the first side portion, the bottom portion, and the second side portion, and the third side portion can be separated from the first side portion, the bottom portion, and the second side portion. By separating the third side portion from the first side portion, the bottom portion, and the second side portion, the first extension portion is expanded from the first side portion, the bottom portion, and the second side portion while the third side portion is connected to the canopy portion, and the storage space in the bag can be expanded widely on the bottom portion side, thereby increasing the volume of the storage space. Furthermore, by opening the third fastener, the fourth side portion is released from the restraint state with respect to the first side portion, the bottom portion and the second side portion, and the fourth side portion can be separated from the first side portion, the bottom portion and the second side portion. By separating the fourth side portion from the first side portion, the bottom portion and the second side portion, the second extension portion is extended from the first side portion, the bottom portion and the second side portion while the fourth side portion is connected to the canopy portion, and the storage space within the bag can be expanded widely on the bottom portion side, thereby increasing the volume of the storage space.

[0009] In addition, a linear thin wall portion is provided on the bottom surface. Since the thin wall portion has a lower bending rigidity than the area other than the thin wall portion, the portion connected to the thin wall portion can be easily bent around the thin wall portion to fold the bag and make it compact. This allows the bag to be folded and carried in a compact state when no object is being stored, providing a bag with excellent portability. Furthermore, since the bag can be folded, it does not require a large occupancy space in a designated storage area in a house or a designated display area in a store, and space can be saved.

[0010] According to the present invention, the bag includes a top portion, a first side portion, a second side portion, a third side portion, a fourth side portion, a bottom portion, a first fastener, a second fastener, an extension portion, and a grip portion. A thin wall portion is provided on the bottom portion. Since the thin wall portion has a lower bending rigidity than the area other than the thin wall portion, the portion connected to the thin wall portion can be easily folded around the thin wall portion to fold the bag and make it compact. This allows the bag to be folded and carried in a compact state when not storing an object, providing a bag with excellent portability. Furthermore, since the bag can be folded, a large occupancy space is not required in a designated storage location in a house or a designated display location in a store, and space saving can be achieved.

[0011] According to the present invention, the bottom portion is constructed with a three-layer structure in which an interlining is interposed between the outer sheet and the inner sheet, so that even if the bag is placed on an uneven floor surface, the bottom portion is prevented from deforming significantly. This prevents the storage space in the bag from being reduced by the deformation of the bottom portion. Furthermore, since the bottom portion is prevented from deforming significantly, the displacement of objects caused by the deformation of the bottom portion is prevented, and a stable storage state can be obtained. Furthermore, since the bottom portion has a three-layer structure, the bottom portion is less likely to wrinkle or bend, and the deterioration of the aesthetic appearance can be prevented. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing a bag 1 according to one embodiment of the present invention. [Diagram 2] 1 is a perspective view showing the bag 1 in an expanded state with the second fastener F2 and the third fastener F3 open. FIG. [Diagram 3] FIG. [Figure 4] 1 is a front view showing the bag 1 in an expanded state with the second fastener F2 and the third fastener F3 open. FIG. [Diagram 5] 1 is a bottom view showing the bag 1 in an expanded state with the second fastener F2 and the third fastener F3 open. FIG. [Figure 6]6 is a cross-sectional view of the bottom portion 7 of the bag 1 taken along the cutting line VI-VI in FIG. 5. [Figure 7] 7(1) shows the folding procedure for bag 1, with FIG. 7(1) showing the bottom portion 7 folded flat so as to overlap the first side portion 3 and the second side portion 4, FIG. 7(2) showing the first side portion 3 and the second side portion 4 folded under the bottom portion 7, FIG. 7(3) showing the bag in the state shown in FIG. 7(2) with about 1 / 3 of one side folded at the first thin portion 15a, FIG. 7(4) showing the bag in the state shown in FIG. 7(3) with about 1 / 3 of the right side folded at the second thin portion 15b, and FIG. 7(5) showing the bag 1 in the folded state and a portable bag 31 for storing the folded bag 1. [Figure 8] FIG. 2 is a front view showing a bag 1a according to another embodiment of the present invention. [Figure 9] FIG. 9 is an enlarged bottom view of a portion of the bag 1a shown in FIG. 8. [Figure 10] 10 is a cross-sectional view of the bag 1a taken along the cutting line XX in FIG. 9. [Figure 11] FIG. 2 is a bottom view of a bag 1b according to another embodiment of the present invention. [Figure 12] 13 is a cross-sectional view of a bottom portion 7 of a bag 1c according to still another embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] FIG. 1 is a perspective view showing a bag 1 according to an embodiment of the present invention, FIG. 2 is a perspective view showing the bag 1 in an expanded state with the second fastener F2 and the third fastener F3 of the bag 1 open, FIG. 3 is a front view of the bag 1, FIG. 4 is a front view showing the bag 1 in an expanded state with the second fastener F2 and the third fastener F3 open, FIG. 5 is a bottom view showing the bag 1 in an expanded state with the second fastener F2 and the third fastener F3 open, and FIG. 6 is a cross-sectional view of the bottom part 7 of the bag 1 taken along the section line VI-VI in FIG. 5. In the following description, for convenience, the bag 1 is assumed to be a Boston bag that is long in one direction, and the one direction of the bag 1 may be referred to as the longitudinal direction, and the direction perpendicular to the longitudinal direction may be referred to as the width direction. The term "connection" refers to the joining of fabrics by a sewing machine or by hand sewing, and may be referred to as sewing. Such connections are not limited to sewing, but may be made by any of heat fusion, ultrasonic bonding, and adhesion, and one or more combinations can be appropriately selected depending on the processing conditions such as the material, shape, thickness, size, and processing time of the fabric.

[0014] The bag 1 of this embodiment includes a canopy portion 2, a first side portion 3, a second side portion 4, a third side portion 5, a fourth side portion 6, a bottom portion 7, a first fastener F1, a second fastener F2, a third fastener F3, a first extension portion 8, a second extension portion 9, a first gripping portion 10, and a second gripping portion 11. The first gripping portion 10 and the second gripping portion 11 are belt-shaped, and both ends are sewn to the first side portion 3 and the second side portion 4, respectively, in a curved inverted U-shape.

[0015] The materials for the canopy portion 2, the first side portion 3, the second side portion 4, the third side portion 5, the fourth side portion 6, the first extension portion 8, the second extension portion 9, the first gripping portion 10, and the second gripping portion 11 can be appropriately selected from one or more of, for example, a woven fabric made of polyester fibers, synthetic leather, and a synthetic resin sheet.

[0016] The canopy portion 2 has two belt-shaped portions 2a and 2b, which are connected in parallel by a first fastener F1. The canopy portion 2 has a generally rectangular shape in the unfolded state. The first side portion 3 has one end 3a connected to one long side portion 2c of the canopy portion 2 and the other end 3b located opposite to the one end 3a. The second side portion 4 has one end 4a connected to the other long side portion 2d of the canopy portion 2 and the other end 4b opposite to the one end 4a. The third side portion 5 has one end 5a connected to one short side portion 2e of the canopy portion 2 and the other end 5b connected to one short side portion 7a of the bottom portion 7. The fourth side portion 6 has one end 6a connected to the other short side portion 2f of the canopy portion 2 and the other end 6b connected to the other short side portion 7b of the bottom portion 7.

[0017] The first extension portion 8 is connected between one end 3c of the first side portion 3 toward the third side portion 5 and one end 5c of the third side portion 5 toward the first side portion 3, between one short side portion 7a of the bottom portion 7 and the other end 5b toward the bottom portion 7 of the third side portion 5, and between one end 4c of the second side portion 4 toward the third side portion 5 and the other end 5d of the third side portion 5 toward the second side portion 4.

[0018] The second extension portion 9 is connected between the other end portion 3d of the first side portion 3 toward the fourth side portion 6 and one end portion 6c of the fourth side portion 6 toward the first side portion 3, between the other short side portion 7b of the bottom portion 7 and the other end portion 6b of the fourth side portion 6 toward the bottom portion 7, and between the other end portion 6d of the fourth side portion 6 toward the second side portion 4 and the other end portion 4d of the second side portion 4 toward the fourth side portion 6.

[0019] The second fastener F2 is arranged to surround the first expansion portion 8, and connects between one end 3c of the first side portion 3 and one end 5c of the third side portion 5, between one short side portion 7a of the bottom portion 7 and the other end 5b of the third side portion 5 closer to the bottom portion 7, and between the other end 5d of the third side portion 5 closer to the second side portion 4 and one end 4c of the second side portion 4 closer to the third side portion 5.

[0020] The third fastener F3 is arranged to surround the second expansion portion 9, and connects between the other end 3d of the first side portion 3 and one end 6c of the fourth side portion 6, between the other short side portion 7b of the bottom portion 7 and the other end 6b of the fourth side portion 6, and between the other end 6d of the fourth side portion 6 closer to the second side portion 4 and the other end 4d of the second side portion 4 closer to the fourth side portion 6.

[0021] 6, the bottom portion 7 includes an outer sheet 71 also called a surface material, an inner sheet 72 also called a lining laminated on the outer sheet 71, and an interlining 73 interposed between the outer sheet 71 and the inner sheet 72. The outer sheet 71 and the inner sheet 72 can be made of either or both of a woven fabric made of polyester fibers and a synthetic resin sheet, as appropriate.

[0022] The material of the interlining 73 may be, for example, an ethylene vinyl acetate copolymer (abbreviated as EVA) sheet. EVA resin is a synthetic resin obtained by copolymerizing ethylene and vinyl acetate, and is lightweight and has excellent flexibility and elasticity, so that even if the bottom portion 7 is locally pressed by an object, the load is distributed, and large deformation of the bottom portion 7 is suppressed, and when the bag 1 is placed on the floor, the reaction force from the floor to the bottom portion 7 is alleviated, thereby protecting the object.

[0023] The bottom portion 7 is provided with a first thin portion 15a extending linearly in a direction perpendicular to the longitudinal direction in the bottom view of Fig. 5 between a side edge portion 13 of the bottom portion 7 closer to the first side portion 3 and a side edge portion 14 of the bottom portion 7 closer to the second side portion 4, between the center portion G of the bottom portion 7 and the second fastener F2. The first thin portion 15a is compressed in the cross-sectional direction by tightly sewing the outer sheet 71, the inner sheet 72, and the interlining 73 with thread, and is formed with low bending rigidity.

[0024] In addition, the bottom portion 7 is provided with a second thin portion 15b extending linearly between the side edge portion 13 of the bottom portion 7 closer to the first side portion 3 and the side edge portion 14 of the bottom portion 7 closer to the second side portion 4 between the center portion G of the bottom portion 7 and the third fastener F3 in the bottom view of FIG. 5. The second thin portion 15b is formed such that the cross section is compressed and the bending rigidity is small by strongly sewing the outer sheet 71, the inner sheet 72, and the interlining 73 with thread. The first thin portion 15a and the second thin portion 15b are formed parallel to the width direction perpendicular to the longitudinal direction in the bottom view. The first thin portion 15a and the second thin portion 15b are spaced apart from each other at a distance L4 in the longitudinal direction of the bag 1. The distance L4 is, for example, 280 mm.

[0025] The first fastener F1 includes two strip-shaped tapes 16a, 16b, a plurality of teeth 17a, 17b attached to adjacent side edges of each tape 16a, 16 in an engaging manner, a slider 18 that alternately engages the teeth 17a on one tape 16a with the teeth 17b on the other tape 16b by moving in one direction and disengages the engaged teeth 17a, 17 by moving in the other direction opposite to the one direction, an upper stop fitting 19 fixed to each tape 16a, 16b adjacent to the teeth 17a, 17b provided at the downstream end of the teeth 17a, 17b in one direction of movement of the slider 18, and a lower stop fitting 20 fixed to each tape adjacent to the teeth 17a, 17b provided at the upstream end of the teeth 17a, 17b in the other direction of movement of the slider 18.

[0026] Each of the tapes 16a, 16b may be made of a strip-shaped sheet made of, for example, polypropylene. The teeth 17a, 17b may be made of metal or synthetic resin. The slider 18 has a guide portion with a substantially H-shaped cross section that guides the teeth 17a, 17b, and a grip portion that is attached to the guide portion and is gripped by the user's fingers, and is made of, for example, metal or synthetic resin.

[0027] As shown in FIG. 6, the second fastener F2 and the third fastener F3 are configured in the same manner as the first fastener F1 described above except for their different lengths. Corresponding parts are given the same reference numerals and descriptions thereof are omitted to avoid duplication.

[0028] 5, the interval L3a between the first thin portion 15a and one tape 16b of the second fastener F2 is, for example, 75 mm, the interval L2a between the one tape 16a and the other tape 16a is set to, for example, 70 mm as an expanded dimension, and the interval L1a between the other tape 16a and the other end 5b of the third side surface portion 5 is, for example, 40 mm. Also, the interval L3b between the second thin portion 15b and one tape 16b of the third fastener F3 is, for example, 75 mm, the interval L2b between the other tape 16b and one tape 16a is set to, for example, 70 mm as an expanded dimension, and the interval L1b between the one tape 16b and the other end 6b of the third side surface portion 5 is, for example, 40 mm.

[0029] The canopy portion 2 is provided with a first fastener F1, and the expanded shape of the canopy portion 2 is generally rectangular when viewed in a plan view with the first fastener F1 closed. The expanded shape of the canopy portion 2 is not limited to a rectangle, but may be a quadrilateral with gently curved sides, and an appropriate shape can be adopted depending on the objects to be stored or the appearance required from a design perspective.

[0030] The first side portion 3 is connected to one long side portion 2c of the canopy portion 2, and the second side portion 4 is connected to the other long side portion 2d of the canopy portion 2. The first side portion 3 and the second side portion 4 are positioned so as to face each other. The third side portion 5 is connected to one short side portion 2e of the canopy portion 2, one end portion 3c of the first side portion 3, and one end portion 4c of the second side portion 4. The fourth side portion 6 is connected to the other short side portion 2f of the canopy portion 2, the other end portion 3d of the first side portion 3, and the other end portion 4d of the second side portion 4. The bottom portion 7 is connected to the first side portion 3, the second side portion 4, the third side portion 5, and the fourth side portion 6, and is positioned so as to face the canopy portion 2.

[0031] With the second fastener F2 in a closed state, the first extension portion 8 is sewn to the canopy portion 2, the second side portion 4, the bottom portion 7, and the second side portion 4 in the vicinity of one short side portion 2e of the canopy portion 2 in a relaxed state toward the back side of the second fastener F2, i.e., the storage space side of the bag 1. In addition, the second extension portion 9 is sewn to the canopy portion 2, the first side portion 3, the bottom portion 7, and the second side portion 4 in the vicinity of the other short side portion 2f of the canopy portion 2.

[0032] When the amount of objects increases, the first expansion portion 8 and the second expansion portion 9 can open the second fastener F2 and the third fastener F3 to move the third side portion 5 and the fourth side portion 6 away from each other, thereby increasing the storage space of the bag 1 on the hand surface portion 7 side and storing the objects.

[0033] Since the bag 1 has a large storage space on the bottom portion 7 side, even if the number of objects increases at the destination, the increased number of objects can be stored inside the expanded bag 1.

[0034] 7(1) shows the folding procedure for bag 1, with FIG. 7(1) showing bag 1 folded flat so that bottom portion 7 overlaps first side portion 3 and second side portion 4, FIG. 7(2) showing a portion of the first side portion 3 and second side portion 4 on the canopy portion 2 side folded under bottom portion 7, FIG. 7(3) showing approximately 1 / 3 of the left side of bag 1 in the state shown in FIG. 7(2) folded at first thin portion 15a, FIG. 7(4) showing approximately 1 / 3 of the right side of bag 1 in the state shown in FIG. 7(3) folded at second thin portion 15b, and FIG. 7(5) showing the folded bag 1 turned upside down and a portable bag 31.

[0035] When the bag 1 is not containing an object, it can be folded to about 1 / 3 of its original size. When folding the bag 1, as shown in Fig. 7(1), the bag 1 is folded so that the bottom portion 7 overlaps the first side portion 3 and the second side portion 4 to form a flat shape. Next, as shown in Fig. 7(2), a part of the second side portion 4 and the third side portion 5 protruding from the bottom portion 7 on the side of the canopy portion 2 is folded together with the first gripping portion 10 and the second gripping portion 11 so as to overlap under the bottom portion 7, and as shown in Fig. 7(3), about 1 / 3 of the left side of the second side portion 4, the third side portion 5, and the bottom portion 7 is folded at the first thin portion 15a to overlap the central bottom portion 7.

[0036] Next, as shown in Fig. 7(4), the remaining approximately 1 / 3 of the right side is folded and placed on top of the previously folded portion. Since the bag 1 has the first thin portion 15a and the second thin portion 15b, as shown in Figs. 7(3) and 7(4), the bending rigidity of the bottom portion 7 is small in the first thin portion 15a and the second thin portion 15b, so that the bottom portion 7 can be easily folded to approximately 1 / 3 of its size that can be stored in the portable bag 31 without the folding position being shifted when the bottom portion 7 is placed together with the second side portion 4 and the third side portion 5. Since the portable bag 31 can be stored in the portable bag 31 in the folded state in this way, when the bag 1 is not in use, the bag 1 can be folded to approximately 1 / 3 of its size and stored in a specified storage location in the house, such as a closet or storeroom, in a small occupancy space, thereby saving space.

[0037] Fig. 8 is a perspective view showing a bag 1a according to another embodiment of the present invention, Fig. 9 is an enlarged bottom view of the bag 1a shown in Fig. 8, and Fig. 10 is a cross-sectional view of the bag 1a taken along the cutting line XX in Fig. 9. Note that in the bag 1a of this embodiment, parts corresponding to those of the bag 1 of the above-mentioned embodiment are designated by the same reference numerals, and duplicated explanations will be omitted.

[0038] The bag 1a of this embodiment includes a canopy portion 2, a first side portion 3, a second side portion 4, a third side portion 5, a fourth side portion 6, a bottom portion 7, fasteners F4, F5, F6, a first gripping portion 10, a second gripping portion 11, and a third gripping portion 32.

[0039] The bottom portion 7 has a first thin portion 15a and a second thin portion 15b similar to the bottom portion 7 of the bag 1 of the above-mentioned embodiment. The first side portion 3 is provided with a first pocket portion 36 that can be opened and closed by a fifth fastener F5 and a second pocket portion 37 that can be opened and closed by a sixth fastener F6.

[0040] The third gripping portion 32 has one end hooked to a locking fitting 38 fixed to the third side surface portion 5, and the other end hooked to a locking fitting 39 fixed to the fourth side surface portion 6. The opening of the third pocket portion 40 is covered by a cover piece 40a sewn to the third side surface portion 5, and the opening of the fourth pocket portion 41 is covered by a cover piece 41a sewn to the fourth side surface portion 6.

[0041] 9 is the longitudinal direction of the bag 1a, the longitudinal distance L11 between the first thin-walled portion 15a and the second thin-walled portion 15b is, for example, 300 mm, the longitudinal distance L12 between the first thin-walled portion 15a and one side portion 23 of the bottom portion 7 is, for example, 150 mm, and the longitudinal distance L13 between the second thin-walled portion 15b and the other side portion 28 of the bottom portion 7 is, for example, 150 mm. These distances L11, L12, and L13 are not limited to 300 mm, 150 mm, and 150 mm, and appropriate dimensions are adopted depending on the size of the object, the required shape, etc.

[0042] The first thin-walled portion 15a and the second thin-walled portion 15b are thinned by sewing the outer sheet 27a, the inner sheet 27b, and the interlining 27c that constitute the bottom portion 7 with a sewing thread, and are configured to have a small bending rigidity. Therefore, when the bag 1a is not in use, the user can manually fold a part of the bottom portion 7 to fold the bottom portion 7 around the first thin-walled portion 15a and the second thin-walled portion 15b, making the folding work easier. In addition, the first thin-walled portion 15a and the second thin-walled portion 15b are not limited to a configuration that extends in the width direction perpendicular to the longitudinal direction, but may be provided at a desired angle, for example, 45°, in the longitudinal direction. In addition, the first thin-walled portion 15a and the second thin-walled portion 15b are not limited to two, and may be only one, or may be three or more.

[0043] In another embodiment of the present invention, a flat bottom plate made of, for example, foamed polyvinyl chloride and having a higher bending rigidity than the bottom portion 7 may be removably attached to the bottom portion 7. By attaching a bottom plate to the bottom portion 7, when an object is placed in the bag 1, the object is supported on the bottom plate, thereby suppressing deformation of the bottom portion 7.

[0044] FIG. 11 is a bottom view of a bag 1b according to another embodiment of the present invention. The same reference numerals are used for parts corresponding to those in the above-mentioned embodiment, and duplicated explanations are omitted. In the above-mentioned embodiment, the bag 1, 1a has a first thin wall portion 15a and a second thin wall portion 15b extending in the width direction perpendicular to the longitudinal direction of the bottom wall portion 7. However, in another embodiment of the present invention, the bottom wall portion 7 may have a thin wall portion 15 extending in the longitudinal direction at the center of the width direction. According to this configuration, the thin wall portion 15 is formed extending in the longitudinal direction of the bottom wall portion 7, so that the bottom wall portion 7 can be made foldable along its longitudinal direction. This allows the bag 1b to be folded at the thin wall portion 15 to be made compact when not in use. In addition, the cross-sectional shape perpendicular to the longitudinal direction of the bottom wall portion 7 is substantially uniform along the longitudinal direction, so that deformation of the bottom wall portion 7 when an object is stored in the bag 1b can be suppressed.

[0045] According to this other embodiment, the thin portion 15 extends along the longitudinal direction of the bottom portion 7, so that the bending rigidity against the downward deformation of the longitudinal center portion of the bottom portion 7 is reduced less than that of the first thin portion 15a and the second thin portion 15b of the above-mentioned embodiment. Therefore, even if an object is stored in the bag 1b, the bottom portion 7 is unlikely to deform downward due to the weight of the object, and the sagging of the bottom portion 7 due to the weight of the object can be suppressed. In addition, by laying the above-mentioned bottom plate on the bottom portion 7, the downward deformation of the bottom portion 7 due to the weight of the object can be suppressed. When the bag 1b is to be made smaller when not in use, the bottom plate is moved within the bag 1b so as to stand along one of the two side portions 5, 6, or the bottom plate is removed from the bag 1b, so that the bottom plate does not interfere with the deformation of the bottom portion 7 when it is folded, and the bottom portion 7 can be easily folded at the center in the width direction.

[0046] Fig. 12 is a cross-sectional view of the bottom surface portion 7 of a bag 1c according to still another embodiment of the present invention. The same reference numerals are used for parts corresponding to those in the above-mentioned embodiment, and duplicated explanations will be omitted. In the above-mentioned embodiment, as shown in Fig. 6, the first thin-walled portion 15a and the second thin-walled portion 15b are configured so that recessed grooves are formed on both sides in the thickness direction of the bottom surface portion 7. However, in this embodiment, as shown in Fig. 12, the first thin-walled portions 15a1 and 15b1 may be configured so that recessed grooves are formed only on the outside of the bottom surface portion 7. By employing such first thin portion 15a1 and second thin portion 15b1, it is possible to guide the folding direction of the portion of bottom portion 7 closer to third side portion 5 than first thin portion 15a1 and the portion of bottom portion 7 closer to fourth side portion 6 than second thin portion 15b1 so as to overlap the portion between first thin portion 15a1 and second thin portion 15b1 of bottom portion 7, i.e., so that first thin portion 15a1 and second thin portion 15b1 form a recessed corner, while suppressing a decrease in bending rigidity of bottom portion 7. In addition, when an object is stored in bag 1c, it is possible to suppress the bottom portion 7 from easily bending downwardly convexly at first thin portion 15a1 and second thin portion 15b1 due to the weight of the object. Even in bag 1c having a bottom portion 7 having first thin-walled portion 15a1 and second thin-walled portion 15b1, the bending rigidity can be further increased by laying the aforementioned bottom plate on bottom portion 7, so that when an object is contained in bag 1c, the bottom portion 7 can be prevented from easily deforming downwardly convexly due to the weight of the object.

[0047] According to the bags 1, 1a, 1b, 1c of the present invention, the bottom surface 7 is provided with the thin wall portions 15; 15a, 15b; 15a1, 15b1, so that the bottom surface 7 can be easily folded manually to make the bags 1, 1a, 1b, 1c small. As a result, the bags 1, 1a, 1b, 1c can be stored or displayed in a storage or display location without requiring a large space, and a neat appearance can be obtained, improving the aesthetics. Furthermore, at the stores selling the bags 1, 1a, 1b, 1c, the display space required for displaying the bags in the store can be reduced, so that the bags 1, 1a, 1b, 1c can be transported easily, the display space can be saved, and logistics costs can be reduced.

[0048] Furthermore, according to the bag 1 of the present invention, since the bag 1 has the first expansion portion 8 and the second expansion portion 9, the volume of the storage space can be increased by opening the second fastener F2 and the third fastener F3 to expand the first expansion portion 8 and the second expansion portion 9.

[0049] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and various modifications and improvements are possible within the scope of the gist of the present invention. It goes without saying that all or part of the components of each of the above-mentioned embodiments can be appropriately combined within the scope of not contradicting each other. [Explanation of symbols]

[0050] 1,1a Bag 2 Canopy 2a, 2b Belt 2c One long side 2d The other long side 2e One short side 2f The other short side 3 First side part 3a One end 3b Other end 3c One end 3d other end 4 Second side part 4a One end 4b Other end 4c One end 4d Other end 5 Third side part 5a One end 5b Other end 5c One end 5d Other end 6 Fourth side part 6a One end 6b Other end 6c One end 6d Other end 7 Bottom part 7a One short side 7b The other short side 8 First Extension 9 Second Extension 10 First grip part 11 Second grip part 13 First edge 14 Second edge 15 Thin section 15a,15a1 1st thin section 15b,15b1 2nd thin section 16a, 16b Tape 17a,17b Work teeth 27a,71 External sheet 27b,72 Inner sheet 27c,73 Interlining 31 Portable Bag 32 Third grip part F1 First fastener F2 Second fastener F3 Third fastener F4 4th fastener F5 Fifth fastener F6 6th fastener G center

Claims

1. A rectangular canopy portion having two strip-shaped portions; A first side portion connected to one long side portion of the canopy portion; A second side portion connected to the other long side portion of the canopy portion; a third side portion connected to one short side portion of the canopy portion; a fourth side portion connected to the other short side portion of the canopy portion; a bottom surface portion connected to the first side surface portion, the second side surface portion, the third side surface portion, and the fourth side surface portion; a first extension portion connected between one end of the first side surface portion closer to the third side surface portion and one end of the third side surface portion closer to the first side surface portion, between one short side portion of the bottom surface portion and one end of the third side surface portion closer to the bottom surface portion, and between one end of the second side surface portion closer to the third side surface portion and the other end of the third side surface portion closer to the second side surface portion; a second extension portion connected between the other end of the first side surface portion closer to the fourth side surface portion and one end of the fourth side surface portion closer to the first side surface portion, between the other short side portion of the bottom surface portion and the other end of the fourth side surface portion closer to the bottom surface portion, and between the other end of the fourth side surface portion closer to the second side surface portion and the other end of the second side surface portion closer to the fourth side surface portion; a first fastener connecting the two strip portions in parallel; a second fastener provided to surround the first extension portion and connecting between the one end of the first side surface portion and the one end of the third side surface portion, between the one short side portion of the bottom surface portion and the one end of the third side surface portion, and between the other end of the third side surface portion and the one end of the second side surface portion; a third fastener provided to surround the second extension portion and connecting between the other end of the first side portion and the one end of the fourth side portion, between the other short side portion of the bottom portion and the other end of the fourth side portion closer to the bottom portion, and between the other end of the fourth side portion closer to the second side portion and the other end of the second side portion closer to the fourth side portion; A first gripping portion having both ends connected to the first side surface portion; A second gripping portion having both ends connected to the second side portion; a thin-walled portion provided on the bottom surface portion and extending linearly.

2. A rectangular canopy portion having two strip-shaped portions; A first side portion connected to one long side portion of the canopy portion; A second side portion connected to the other long side portion of the canopy portion; a third side portion connected to one short side portion of the canopy portion; a fourth side portion connected to the other short side portion of the canopy portion; a bottom surface portion connected to the first side surface portion, the second side surface portion, the third side surface portion, and the fourth side surface portion; a fastener connecting the two strip portions in parallel; a band-shaped grip portion having one end connected to the third side surface portion and the other end connected to the fourth side surface portion; a thin-walled portion provided on the bottom surface portion and extending linearly.

3. 3. The bag according to claim 1, wherein the bottom portion includes an outer sheet, an inner sheet laminated to the outer sheet, and an interlining interposed between the outer sheet and the inner sheet.

Images