Shoe

Abstract

To provide a shoe which allows all of evaporation of odor and sweat after wearing the shoe in daytime by fully opening a fastener of the shoe, spraying of a deodorant (deodorant spray) to the inside of the shoe, facilitation of washing of the inside of the shoe in cleaning of the shoe, facilitation of drying of the shoe after cleaning, wherein any constitutional member of the shoe is not lost.SOLUTION: A slide fastener 70 is configured so that one end 71 is provided on a cross part (71) between a coupling part 31 between an instep part 50 and an inside part 30 and a wearing hole 10, the other end 72 is provided on a coupling part between the instep part 50 and an outside part 40 and at near a hole edge part 11 of the wearing hole 10. A part 73 between the one end 71 and the other end 72 is along the coupling parts 31, 41 between the inside part 30, the outside part 40 and the instep part 50, and is along a tip 61 of a toe part 60. In the shoe, a portion 80 between the other end 72 and the hole edge part 11 of the wearing hole 10 forms an opening maintaining part 80 for maintaining an opened state of the instep part 50 and the toe part 60 where the instep part and the toe part are opened by a slide fastener 70, by elasticity itself of the portion 80.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to shoes, and more specifically to shoes that allow the zippers of the shoes to be fully opened to allow sweat and odor to evaporate after wearing the shoes during the day, make it easy to spray a deodorant (deodorant spray) inside the shoes, make it easy to wash the inside of the shoes, and make it easy to dry the shoes after washing. [Background technology]

[0002] Conventionally, techniques such as those shown in Patent Documents 1 to 4, for example, have been known.

[0003] <Patent Document 1> Utility Model Registration No. 3038610 Patent Document 1 states: The goal is to provide inexpensive shoes that are easy for people with foot disabilities to put on and take off. "A shoe having a sole, an upper part, the part of the upper located at the instep part of the foot being capable of being opened and closed by pivoting about a part of the circumference of the part, and being capable of providing an opening in the upper part of the shoe larger than the opening that exists when the part is closed, and means provided at predetermined points along the circumference for fixing the part in a closed position." is stated in the literature summary.

[0004] However, in this shoe, the fastener that opens and closes the part 3 that contacts the instep is made up of fabric fasteners 7b, 7a, so the opening 6 is partially blocked by the fabric fastener 7a. Therefore, even if the zipper is fully opened, it is not suitable for evaporating sweat and odor after wearing the shoes during the day, or for spraying deodorant (deodorant spray) inside the shoes. Also, it is not easy to wash the inside of the shoes when washing them, and it is not easy to dry them after washing.

[0005] <Patent Document 2> Utility Model Registration No. 3040271 In Patent Document 2, The goal is to provide shoes that are easy to put on and take off for the elderly, young children, physically disabled people, patients who are temporarily disabled, or their caregivers, while also having a good appearance design. "In a shoe (1) having a shoe body (3) consisting of an outer part (4), an inner part (5) and a sole part (6), and a shoe cover part (2) consisting of an instep part (21) and a toe part (22), the shoe cover part (2) is formed as a separate body, and the tip part of the shoe cover part (2) and the shoe body (3) are sewn and fixed, and a slide fastener (7) is attached to both sides and the front part of the shoe cover part (2) and the corresponding outer part (4) and inner part (5). Furthermore, the heel part (17) is vertically divided, and a slide fastener (7) is formed in the vertically divided part (19) so that it can be freely opened. By opening the shoe cover part (2) and the heel part (17) as described above, the shoe (1) is laid out flat, and a foot is placed on the inner surface of the sole (15) and the outer part (4), inner part (5) and shoe cover part (2) are opened. The shoes (1) can be put on by wrapping the feet around them, so that even people with disabilities, small children, and their caregivers can easily put on and take off the shoes. Shoes are mentioned (ibid. abstract).

[0006] However, this shoe has a structure in which the shoe cover (2) is formed separately and the tip of the shoe cover (2) and the shoe body (3) are sewn together, making this sewn-together portion difficult to wash and dry. In addition, since the structure requires two slide fasteners (7) on the left and right, opening and closing operations are cumbersome.

[0007] In Figures 3 and 4 of the same document 2, The document describes a shoe (1) made of synthetic leather, which has a shoe body (3) consisting of an outer part (4), an inner part (5) and a sole part (6), and a cap part (2) consisting of a cusp part (21) and a toe part (22). The cap part (2) is separated on a line from the ankle to the little toe and on a line along the toe at the front end, and the separation line is approximately inverted J-shaped when viewed from above. A male hook-and-loop fastener (10) and a female hook-and-loop fastener (11) are sewn to the inner surface of the front part of the cap part (2) and the outer surface of the vertical surface (13) fixed to the sole (6), respectively, and the front part of the toe part (22) is attached so as to cover the vertical surface (13) (paragraph 0012 of the same document).

[0008] However, in this shoe, "the shoe cover (2) is separated on a line from the ankle to the little toe and on a line along the toe at the front end, and the separation line is roughly inverted J-shape when viewed from above," so the connection between the shoe cover (2) and the shoe body is long. It is also unclear whether the shoe cover (2) will remain open. Therefore, even if the zipper is fully opened, it is not suitable for evaporating sweat and odor after wearing the shoes during the day, or for spraying deodorant (deodorant spray) inside the shoes. Also, it is not easy to wash the inside of the shoes when washing them, and it is not easy to dry them after washing.

[0009] <Patent Document 3> Utility Model Registration No. 3199079 In Patent Document 3, The objective of the project is to provide shoes that are extremely easy to put on and take off for the elderly and physically disabled who have difficulty putting their feet through the openings of the shoes. "A series of fasteners 4, each having two ends on the left and right near the center of the upper heel portion 12, pass near the soles of the left and right side uppers, and go around the upper toe portion 15. By opening the fasteners, the upper portion is separated from the sole 2. When the fastener is closed, it has two sliders 6, one at each end of the two, and the fastener is opened by sliding the two sliders to the vicinity of the upper toe portion, and the upper is released from the sole, leaving a part of the upper toe portion. In this state, the user can put on the shoe by simply placing the foot on the sole and closing the fastener. Also, when the fastener is closed, only one of the two sliders located at the end of the two is rotated around the upper toe portion and slid to the other end, and the upper is completely released from the sole." Shoes are mentioned (ibid. abstract).

[0010] As shown in Figure 6 of the document, this shoe allows the upper 1 and sole 2 to be completely separated, which makes it possible for sweat and odor to evaporate after wearing the shoe during the day, for the inside of the shoe to be easily sprayed with a deodorant (deodorant spray), for the inside of the shoe to be easily washed, and for the shoe to be easily dried after washing.

[0011] However, since the upper 1 and the sole 2 of this shoe are completely separable, there is a risk that either the upper 1 or the sole 2 will be lost.

[0012] <Patent Document 4> JP 2017-170191 A Patent Document 4 states: The objective of the project is to provide shoes that the wearer can wear without touching the fasteners. "Shoe 1 is primarily composed of sole 2, upper 3, and fastener 4. A lower element 4B of fastener 4 is provided on the periphery of sole 2, and an upper element 4A of fastener 4 is provided on the lower edge of upper 4. Sole 2 and upper 3 are separably joined by fastener 4. Sole 2 has a coating layer on its upper surface, and a convex portion is formed on all or part of its periphery to avoid contact with fastener 4." is stated in the literature summary.

[0013] Since the sole 2 and upper 3 of these shoes can be completely separated by a zipper 4, it is believed that it is possible to evaporate sweat and odors after wearing the shoes during the day, to easily spray deodorant (deodorant spray) on the inside of the shoes, to easily clean the inside of the shoes when washing them, and to easily dry the shoes after washing.

[0014] However, since the sole 2 and the upper 3 of this shoe are completely separable, there is a risk that either the sole 2 or the upper 3 will be lost. [Prior art documents] [Patent documents]

[0015] [Patent Document 1] Utility Model Registration No. 3038610 [Patent Document 2] Utility Model Registration No. 3040271 [Patent Document 3] Utility Model Registration No. 3199079 [Patent Document 4] JP 2017-170191 A Summary of the Invention [Problem to be solved by the invention]

[0016] The problem that this invention aims to solve is to provide shoes that allow the zipper to be fully opened to allow sweat and odor to evaporate after wearing the shoes during the day, make it easy to spray a deodorant (deodorant spray) inside the shoes, make the inside of the shoes easy to wash when washing, and make it easy to dry after washing, all without losing any of the component parts. [Means for solving the problem]

[0017] In order to solve the above problems, the shoe of the present invention comprises: The opening where you put your foot in A sole portion is located at the bottom of the foot inserted through the opening; an inner side portion and an outer side portion rising from the left and right sides of the sole portion, an instep portion that connects the medial portion and the lateral portion and covers the instep of the foot; A toe portion covering the toes of the foot; A slide fastener that can open and close at least the upper part; A shoe comprising: The slide fastener is One end of the shoe is provided at an intersection of a connecting portion between one of the inner portion and the outer portion and the upper portion and the opening of the shoe; The other end is a connecting portion between the other of the inner portion and the outer portion and the upper portion, and is provided near the edge of the opening; The portion between the one end and the other end is provided along the connection between the medial portion, the lateral portion and the upper portion and along the tip end of the toe portion, In the shoe, the area between the other end and the edge of the opening constitutes an open maintaining section that maintains the upper and toe sections opened by the slide fastener in an open state by the elasticity of the area itself.

[0018] This shoe provides the following effects: The opening where you put your foot in A sole portion is located at the bottom of the foot inserted through the opening; an inner side portion and an outer side portion rising from the left and right sides of the sole portion, an instep portion that connects the medial portion and the lateral portion and covers the instep of the foot; A toe portion covering the toes of the foot; A slide fastener that can open and close at least the upper part; Since the upper part is provided with a fastener, at least the upper part can be opened and closed by operating the slide fastener.

[0019] And the slide fastener, One end of the shoe is provided at an intersection of a connecting portion between one of the inner portion and the outer portion and the upper portion and the opening of the shoe; The other end is a connecting portion between the other of the inner portion and the outer portion and the upper portion, and is provided near the edge of the opening; The portion between the one end and the other end is provided along the connection between the inner portion, the outer portion and the upper portion and along the tip portion of the toe portion, so that by opening from the one end to the other end, the upper portion and the toe portion can be opened widely.

[0020] Moreover, the portion of the shoe between the other end and the edge of the opening constitutes an open-keeping portion that maintains the upper and toe portions opened by the slide fastener in an open state by the elasticity of the portion itself, so that sweat and odor can be evaporated while the upper and toe portions are open, and deodorant (deodorant spray) can be easily sprayed inside the shoe, and the inside of the shoe can be easily washed. Furthermore, since the upper and toe portions can be dried while remaining open after washing, the inside of the shoe can be easily dried. In addition, since the shoe body and the open upper and toe portions are connected by the open-keeping portion, there is no risk of losing either one.

[0021] As described above, the shoes of the present invention have the following advantages: the zipper can be fully opened to allow sweat and odors to evaporate after wearing the shoes during the day, it is easy to spray a deodorant (deodorant spray) inside the shoes, the inside of the shoes is easy to clean when washing, and they are easy to dry after washing, and there is no risk of losing any of the component parts.

[0022] In order to solve the above problems, the shoe of the present invention comprises: The opening where you put your foot in A sole portion is located at the bottom of the foot inserted through the opening; an inner side portion and an outer side portion rising from the left and right sides of the sole portion, an instep portion that connects the medial portion and the lateral portion and covers the instep of the foot; A toe portion covering the toes of the foot; A slide fastener that can open and close at least the upper part; A shoe comprising: The slide fastener is One end of the shoe is provided at an intersection of the connection between the inner part and the upper part and the opening, The other end is a connecting portion between the outer portion and the upper portion, and is provided near the edge of the opening, The portion between the one end and the other end is provided along the connection between the medial portion, the lateral portion and the upper portion and along the tip end of the toe portion, In the shoe, the area between the other end and the edge of the opening constitutes an open maintaining section that maintains the upper and toe sections opened by the slide fastener in an open state by the elasticity of the area itself.

[0023] This shoe provides the following effects: The opening where you put your foot in A sole portion is located at the bottom of the foot inserted through the opening; an inner side portion and an outer side portion rising from the left and right sides of the sole portion, an instep portion that connects the medial portion and the lateral portion and covers the instep of the foot; A toe portion covering the toes of the foot; A slide fastener that can open and close at least the upper part; Since the upper part is provided with a fastener, at least the upper part can be opened and closed by operating the slide fastener.

[0024] And the slide fastener, One end of the shoe is provided at an intersection of the connection between the inner part and the upper part and the opening, The other end is a connecting portion between the outer portion and the upper portion, and is provided near the edge of the opening, The portion between the one end and the other end is provided along the connection between the medial portion, the lateral portion and the upper portion and along the tip of the toe portion, so that by opening from the one end to the other end, the upper portion and the toe portion can be opened widely outward (towards the lateral portion).

[0025] Moreover, the part of the shoe between the other end and the edge of the opening constitutes an open-keeping part that keeps the upper and toe parts opened by the slide fastener open by the elasticity of the part itself, so that sweat and odor can be evaporated while the upper and toe parts are open, and deodorant (deodorant spray) can be easily sprayed inside the shoe, and the inside of the shoe can be easily washed. Furthermore, even after washing, the upper and toe parts can be dried while remaining open to the outside, so the inside of the shoe can be easily dried with the left and right shoes aligned. In addition, the shoe body and the open upper and toe parts are connected by the open-keeping part, so there is no risk of losing either one.

[0026] As described above, the shoes of the present invention have the following advantages: the zipper can be fully opened to allow sweat and odor to evaporate after wearing during the day, it is easy to spray deodorant (deodorant spray) inside the shoes, the inside of the shoes is easy to wash when washing, and they can be easily dried after washing, and none of the components are lost. Moreover, after washing, the left and right shoes can be dried in an aligned state.

[0027] In these shoes, One end of the slide fastener may be a sliding start end of the slider when the slide fastener is opened, and the other end may be a sliding end. With this configuration, an open-keeping portion can be easily formed in the area between the other end and the edge of the opening.

[0028] The shoe is provided with an upper lining, which is made of soft cloth and can be configured to be positioned as the outermost layer of the open-maintaining portion when the upper and toe portions are open. With this configuration, the feel on the skin of the foot can be improved, and at the same time, the open maintaining portion makes it easier to maintain the instep and toe portions in a moderately open state.

[0029] In these shoes, The other end is located lower than the edge of the opening toward the sole of the shoe, and the open-keeping portion can be formed by the area between the edge of the opening and the other end. With this configuration, the instep and toe sections can be opened wider by the so-called twisting action of the open maintaining section.

[0030] In this application, the "near the edge of the opening" where the other end is located means a position close enough to the edge of the opening that the upper and toe parts can be kept open by the open maintaining part constituted by the area between the "near the edge of the opening" position and the edge. [Brief description of the drawings]

[0031] [Figure 1] 1A, 1B, and 1C are diagrams showing an embodiment of a shoe according to the present invention, in which (a) is a front view, (b) is a diagram seen from diagonally right, and (c) is a diagram seen from diagonally left. [Diagram 2] The figures show the upper and toe sections in an open state; (a) is a front view, (b) is a view diagonally from the right, and (c) is a view diagonally from the left. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, an embodiment of a shoe according to the present invention will be described with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals. The drawings should be viewed according to the orientation of the reference numerals.

[0033] As shown in FIG. 1 and FIG. 2, the shoe 1 of this embodiment is: 10 foot opening and A sole portion 20 is located at the bottom of a foot (not shown) inserted through the opening 10; An inner side portion 30 and an outer side portion 40 stand up from the left and right sides of the sole portion 20, respectively; an instep part 50 that connects the medial part 30 and the lateral part 40 and covers the instep of the foot; A toe portion 60 that covers the toes of the foot; A slide fastener 70 that can open and close at least the upper part 50; A shoe comprising: Slide fastener 70 is One end 71 is provided at the intersection (71) between the connection portion 31 between the medial portion 30 and the upper portion 50 and the opening 10, The other end 72 is a connecting portion 41 between the outer portion 40 and the upper portion 50, and is provided near the edge portion 11 of the shoe opening 10. The portion 73 between the one end 71 and the other end 72 is provided along the connecting portions 31, 41 between the medial portion 30, the lateral portion 40 and the upper portion 50, and along the tip portion 61 of the toe portion 60. In the shoe 1, the area 80 between the other end 72 and the lip portion 11 of the opening 10 constitutes an open maintaining portion 80 that maintains the upper portion 50 and toe portion 60 in an open state after being opened by the slide fastener 70, by the elasticity of the area 80 itself.

[0034] The shoes 1 provide the following advantages. 10 foot opening and A sole portion 20 is located at the bottom of the foot inserted through the opening 10; An inner side portion 30 and an outer side portion 40 stand up from the left and right sides of the sole portion 20, respectively; an instep part 50 that connects the medial part 30 and the lateral part 40 and covers the instep of the foot; A toe portion 60 that covers the toes of the foot; A slide fastener 70 that can open and close at least the upper part 50; Equipped with And the slide fastener 70 is One end 71 is provided at the intersection (71) between the connection portion 31 between the medial portion 30 and the upper portion 50 and the opening 10, The other end 72 is a connecting portion 41 between the outer portion 40 and the upper portion 50, and is provided near the edge portion 11 of the shoe opening 10. The portion 73 between one end 71 and the other end 72 is provided along the connecting portions 31, 41 between the medial portion 30, the lateral portion 40 and the upper portion 50, and along the tip portion 61 of the toe portion 60. Therefore, as shown in FIG. 2, by opening from one end 71 to the other end 72, the upper portion 50 and the toe portion 60 can be opened widely outward (toward the lateral portion 40 (right side in FIG. 2(a))).

[0035] Moreover, the portion 80 between the other end 72 and the rim 11 of the opening 10 of the shoe 1 constitutes an open-keeping portion 80 that keeps the upper 50 and toe 60 open by the slide fastener 70 in an open state by the elasticity of the portion 80 itself, so that sweat and odor can be evaporated while the upper 50 and toe 60 are open, and the interior 1b of the shoe can be easily sprayed with a deodorant (deodorant spray), and the interior 1b of the shoe can be easily washed. Furthermore, even after washing, the upper 50 and toe 60 can be dried while remaining open to the outside, so that the interior 1b of the shoe can be easily dried while the left and right shoes are aligned (only the right shoe is shown in FIG. 2(a)). In addition, the shoe body and the open upper 50 and toe 60 are connected by the open-keeping portion 80, so there is no risk of losing either one.

[0036] As described above, the shoes of this embodiment have the following advantages: the slide fastener 70 can be fully opened to allow sweat and odor to evaporate after wearing during the day, the deodorant (deodorant spray) can be easily sprayed on the inside 1b of the shoes, the inside 1b can be easily washed when washing the shoes, and the shoes can be easily dried after washing, and none of the components can be lost. Moreover, after washing, the left and right shoes can be dried in an aligned state.

[0037] One end 71 of the slide fastener 70 is a sliding start end of a slider 75 when the slide fastener 70 is opened, and the other end 72 is an end end.

[0038] With this configuration, the open-maintaining portion 80 can be easily formed in the area 80 between the other end 72 and the rim portion 11 of the opening 10 .

[0039] The shoe 1 is provided with an upper lining 1c, which is made of soft cloth and is positioned as the outermost layer of the open-keeping part 80 when the upper part 50 and the toe part 60 are open. The shoe 1 itself can be made of any suitable known material, and the upper lining 1c can also be made of any known material.

[0040] With this configuration, the feel on the skin of the foot can be improved, and at the same time, the open-maintaining portion 80 makes it easier to maintain the upper portion 50 and the toe portion 60 in a moderately open state.

[0041] As shown primarily in Figure 1(b), the other end 72 is located lower than the edge portion 11 of the opening 10 toward the sole portion 20, and the area 80 between the edge portion 11 of the opening 10 and the other end 72 forms an open maintenance portion 80.

[0042] 2(a), when the upper portion 50 and the toe portion 60 are opened, the upper portion 50 and the toe portion 60 can be opened wider due to the so-called twisting action of the open keeping portion 80. In other words, the upper portion 50 and the toe portion 60 are opened outward and backward around the open keeping portion 80, so that the inside 1b of the shoe and the upper portion 50 and the toe portion 60 are opened wider.

[0043] The length L between the rim 11 of the opening 10 and the other end 72 can be set appropriately within the range of 1 cm to 4 cm depending on the shape and material of the shoe.

[0044] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. for example,

[0045] In the above embodiment, as described above, the slide fastener 70 has one end 71 provided at the intersection (71) between the connecting portion 31 between the medial portion 30 and the upper portion 50 and the opening 10, and the other end 72 provided at the connecting portion 41 between the outer portion 40 and the upper portion 50, near the edge portion 11 of the opening 10; however, one end 71 may be provided at the intersection between the connecting portion 41 between the outer portion 40 and the upper portion 50 and the opening 10, and the other end 72 may be provided at the connecting portion 31 between the medial portion 30 and the upper portion 50, near the edge portion 11 of the opening 10.

[0046] In this case, the opening direction of the slide fastener 70 in a plan view is counterclockwise, the open keeping portion 80 is formed on the inside of the shoe (for example, the portion indicated by the symbol 82 in FIG. 1(c)), and the upper portion 50 and the toe portion 60 are opened to the inside (left side) in FIG. 2(a).

[0047] In the above embodiment, the case where the present invention is applied to sneaker-type shoes is shown, but the present invention can also be applied to other types of shoes. [Explanation of symbols]

[0048] 1: Shoes 10: Opening 20: Sole 30: Inner part 40: Outer part 50: Instep 60: Toe 70: Slide fastener 80: Open maintenance section

Claims

1. The opening for the foot (10) and a sole portion (20) located at the bottom of the foot inserted through the opening (10); An inner part (30) and an outer part (40) rising from the left and right sides of the sole part (20), respectively; an instep part (50) that connects the medial part (30) and the lateral part (40) and covers the instep of the foot; A toe portion (60) that covers the toes of the foot; A slide fastener (70) that can open and close at least the upper part (50); A shoe comprising: The slide fastener (70) is One end (71) of the shoe is provided at an intersection (71) between a connection portion between one of the inner portion (30) and the outer portion (40) and the upper portion (50) and the shoe opening (10); the other end (72) is a connecting portion between the other of the inner portion (30) and the outer portion (40) and the upper portion (50), and is provided near the edge portion (11) of the shoe opening (10); The portion (73) between the one end (71) and the other end (72) is provided along the connecting portion (31, 41) between the medial portion (30), the lateral portion (40) and the upper portion (50) and along the tip portion (61) of the toe portion (60); The shoe is characterized in that the area (80) between the other end (72) and the edge portion (11) of the opening (10) of the shoe constitutes an open maintaining portion (80) that maintains the upper portion (50) and toe portion (60) in an open state by the slide fastener (70) through the elasticity of the area (80) itself.

2. The opening for the foot (10) and a sole portion (20) located at the bottom of the foot inserted through the opening (10); An inner part (30) and an outer part (40) rising from the left and right sides of the sole part (20), respectively; an instep part (50) that connects the medial part (30) and the lateral part (40) and covers the instep of the foot; A toe portion (60) that covers the toes of the foot; A slide fastener (70) that can open and close at least the upper part (50); A shoe comprising: The slide fastener (70) is One end (71) of the shoe is provided at an intersection (71) between the connection (31) between the medial portion (30) and the upper portion (50) and the shoe opening (10); The other end (72) is a connecting portion (41) between the outer portion (40) and the upper portion (50) and is provided near the edge portion (11) of the shoe opening (10); The portion (73) between the one end (71) and the other end (72) is provided along the connecting portion (31, 41) between the medial portion (30), the lateral portion (40) and the upper portion 50, and along the tip portion (61) of the toe portion (60); The shoe is characterized in that the area (80) between the other end (72) and the edge portion (11) of the opening (10) of the shoe constitutes an open maintaining portion (80) that maintains the upper portion (50) and toe portion (60) in an open state by the slide fastener (70) through the elasticity of the area (80) itself.

3. In claim 2, The shoe is characterized in that one end (71) of the slide fastener (70) is a sliding start end of a slider (75) when the slide fastener (70) is opened, and the other end (72) is a terminal end.

4. In any one of claims 1 to 3, The shoe is provided with an upper lining (1c), which is made of soft cloth and is located as the outermost layer of the open-maintaining part (80) when the upper part (50) and the toe part (60) are open.

5. In any one of claims 1 to 3, The other end (72) is provided lower toward the sole (20) side than the edge (11) of the opening (10), and the open-maintaining portion (80) is formed by a portion (80) between the edge (11) of the opening (10) and the other end (72).

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