Method for manufacturing a box for a slide fastener and a separating insertion tool for a slide fastener

Abstract

In the present invention: among inner surfaces (25a, 25b, 25c, 25d) constituting an insertion pin hole (25) of a box (21), a front-side surface (25a) and / or a back-side surface (25b) facing a front surface (11b) / back surface (11c) of an insertion pin (11) has thereon a protrusion (26, 27) capable of engaging with a recess (16, 17); the protrusion (26, 27) has an asymmetric shape about a plane (P) which passes through the center of the protrusion (26, 27) in an opening / closing direction of the insertion pin (11) and is orthogonal to the opening / closing direction; and the protrusion (26, 27) includes an upper inclined surface (26a, 27a) which is formed so as to increase the thickness of the protrusion (26, 27) downwardly from an upper end part of the protrusion (26, 27) in the opening / closing direction of the insertion pin (11) and a lower inclined surface (26b, 27b) which is formed so as to increase the thickness of the protrusion (26, 27) upwardly from a lower end part of the protrusion (26, 27) in the opening / closing direction of the insertion pin (11), wherein the upper inclined surface (26a, 27a) has a larger inclination than the inclination of the lower inclined surface (26b, 27b).

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a slide fastener and a box for a separating and inserting tool for a slide fastener.

Background Art

[0002] A separating and inserting tool for a slide fastener is generally provided at the lower ends of left and right fastener stringers, and includes a butterfly bar on one side and a box on the other side. The fastener stringer has an element row attached to the inner edge of the fastener tape. With the left and right fastener elements in an open state with the slider between the left and right fastener stringers pushed against the separating and inserting tool to the lowest position, the butterfly bar is pulled out of the box, and the butterfly bar is pulled up through the element guide path of the slider, whereby the left and right fastener stringers can be separated. Further, from this separated state, the butterfly bar of one fastener stringer is passed through the element guide path of the slider at the lowest position in contact with the box in the other fastener stringer, and then inserted into the box, whereby the lower ends of the left and right fastener stringers are aligned. By moving the slider upward from this aligned state, the fastener elements between the left and right fastener stringers can be closed.

[0003] When the slider is moved upward in a state where the butterfly bar is not completely inserted into the box, that is, in a state where the lower ends of the left and right fastener stringers are not aligned, an incorrect combination of the left and right fastener stringers may occur. In order to prevent such an event, it is desired that the user can recognize that the lower ends of the pair of left and right fastener stringers are in an aligned state.

[0004] For example, Patent Document 1 discloses a separating and inserting tool for a slide fastener in which a butterfly bar is detachably fitted in a box body substantially parallel to a box bar. In this separating and inserting tool for a slide fastener, a recess is provided at the tip of one or both of the front and back surfaces of the butterfly bar, and a projection that protrudes into the recess is provided on the inner surface of an engagement hole into which the butterfly bar of the box body is fitted. Therefore, in a state where the butterfly bar is completely inserted into the box, the recess of the butterfly bar engages with the projection of the box body and is held, and a resistance is generated when pulling out the butterfly bar from the box body. Thus, when a user tries to pull out the butterfly bar from the box body, the user can recognize that the lower ends of a pair of left and right fastener stringers are aligned.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Here, the slide fastener of Patent Document 1 has a main purpose of enabling easy insertion of the butterfly bar into the box body even with one-handed operation. By forming a tapered surface on the projection and an inclined cam surface on the butterfly bar, when inserting the butterfly bar into the engagement hole, the resistance of the butterfly bar hitting the projection is reduced, and it is intended to enable smooth insertion. Therefore, when inserting the butterfly bar into the box body, it is difficult for a resistance feeling or sound to occur, and there is a possibility that it is difficult for the user to recognize the insertion feeling.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide a slide fastener and a method for manufacturing a box of a separating and inserting tool for a slide fastener that enable a user to appropriately recognize that the butterfly bar has been inserted into the box.

Means for Solving the Problems

[0008] To solve the above problems, the present invention is achieved by the following configuration. [1] A pair of first and second fastener stringers (30A, 30B), at least one slider (40) for opening and closing between the first and second fastener stringers (30A, 30B), and a separating and inserting member (1) provided at the longitudinal lower ends of the first and second fastener stringers (30A, 30B), and a slide fastener (100) comprising: wherein the separating and inserting member (1) includes a first separating and inserting portion (10) provided on the first fastener stringer (30A), and a second separating and inserting portion (20) provided on the second fastener stringer (30B) and capable of being connected to and disconnected from the first separating and inserting portion (10), and comprises: the first separating and inserting portion (10) includes a butterfly bar (11) provided on the inner edge side in the width direction of the first fastener stringer (30A), the second separating and inserting portion (2) includes a box (21) provided on the inner edge side in the width direction of the second fastener stringer (30B), the box (21) is open upward and has a butterfly bar hole (25) through which the butterfly bar (11) can be inserted and removed in the longitudinal direction, at least one of the front surface (11b) and the back surface (11c) of the butterfly bar (11) is provided with recesses (16, 17), among the inner surfaces (25a, 25b, 25c, 25d) constituting the butterfly bar hole (25) of the box (21), at least one of the front side surface (25a) and the back side surface (25b) facing the front surface (11b) and the back surface (11c) of the butterfly bar (11) is provided with protrusions (26, 27) engageable with the recesses (16, 17), the protrusions (26, 27) have an asymmetric shape with respect to a plane (P) passing through the central portion of the protrusions (26, 27) in the insertion and removal direction of the butterfly bar (11) and perpendicular to the insertion and removal direction, The convex portions (26, 27) include upper inclined surfaces (26a, 27a) that increase the thickness of the convex portions (26, 27) as they extend downward from the upper end portions of the convex portions (26, 27) in the insertion and extraction direction of the butterfly rod (11), and lower inclined surfaces (26b, 27b) that increase the thickness of the convex portions (26, 27) as they extend upward from the lower end portions of the convex portions (26, 27) in the insertion and extraction direction of the butterfly rod (11). The inclination of the upper inclined surfaces (26a, 27a) is greater than the inclination of the lower inclined surfaces (26b, 27b). Slide fastener. [2] A pair of first and second fastener strings (30A, 30B), At least one slider (40) for opening and closing between the first and second fastener strings (30A, 30B), A separation and insertion fitting (1) provided at the longitudinal lower end portions of the first and second fastener strings (30A, 30B), A slide fastener (100) comprising: The separation and insertion fitting (1) includes: A first separation and insertion portion (10) provided on the first fastener string (30A), A second separation and insertion portion (20) provided on the second fastener string (30B) and capable of being connected to and disconnected from the first separation and insertion portion (10), and comprising: The first separation and insertion portion (10) includes a butterfly rod (11) provided on the inner edge side in the width direction of the first fastener string (30A), The second separation and insertion portion (2) includes a box (21) provided on the inner edge side in the width direction of the second fastener string (30B), The box (21) is open upward and has a butterfly rod hole (25) through which the butterfly rod (11) can be inserted and extracted in the longitudinal direction, At least one of the front surface (11b) and the back surface (11c) of the butterfly rod (11) is provided with recesses (16, 17). Of the inner surfaces (25a, 25b, 25c, 25d) constituting the butterfly rod hole (25) of the box (21), on at least one of the front side surface (25a) and the back side surface (25b) facing the front surface (11b) and the back surface (11c) of the butterfly rod (11), convex portions (26, 27) engageable with the concave portions (16, 17) are provided. The force (Fin) required to insert the butterfly rod into the butterfly rod hole (25) of the box is greater than the force (Fout) required to pull the butterfly rod out of the butterfly rod hole (25) of the box. Slide fastener. [3] A method for manufacturing a box (21) of a separating insertion tool (1) for a slide fastener, On the box (21), convex portions (26, 27) are provided on the inner surfaces (25a, 25b) of the butterfly rod hole (25) into which the butterfly rod (11) can be inserted and removed. The box (21) is obtained by injection molding using a fixed mold (5), a movable mold (6) provided so as to be reciprocable in the front-rear direction with respect to the fixed mold (5), and first and second slides (7, 8) provided so as to be reciprocable in the vertical direction with respect to the fixed mold (5). By butting the first recess (26x) recessed in the first slide (7) and the second recess (26y) recessed in the second slide (8), a convex portion forming portion (26z) for forming the convex portions (26, 27) is formed. A method for manufacturing a box of a separating insertion tool for a slide fastener.

Effect of the Invention

[0009] According to the present invention, it is a method for manufacturing a box of a slide fastener and a separating insertion tool for a slide fastener, in which a user can appropriately recognize that the butterfly rod has been inserted into the box.

Brief Description of the Drawings

[0010]

Figure 1

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Figure 13C

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Figure 19

Figure 20

Mode for Carrying Out the Invention

[0011] Hereinafter, a method for manufacturing a slide fastener and a box of a separating and inserting tool for a slide fastener according to each embodiment of the present invention will be described in detail with reference to the drawings.

[0012] In the present specification, the "vertical direction" is the sliding direction of the slider, the longitudinal direction of the slide fastener and the fastener stringer, and the insertion and extraction direction of the wing bar into the box. Among the "vertical direction", in particular, the direction in which the slider slides so as to mesh the left and right element rows is defined as "upward", and the direction in which the slider slides so as to separate the left and right element rows is defined as "downward".

[0013] Further, the "left-right direction" is the direction in which a pair of element rows are arranged, the direction orthogonal to the sliding direction of the slider, and can also be referred to as the width direction of the slide fastener, the fastener stringer, the element, the wing bar, and the box.

[0014] Furthermore, the "front-back direction" is the direction orthogonal to the vertical direction and the left-right direction, and can also be referred to as the thickness direction of the slide fastener, the fastener stringer, the element, the wing bar, and the box.

[0015] [First Embodiment] FIG. 1 is a front view of a slide fastener 100 according to the first embodiment of the present invention. FIG. 2 is an enlarged front view showing the connection release state of the first and second separating and inserting portions, and the first and second fastener stringers are separated. FIG. 3 is a side view showing the slider by a dashed line.

[0016] As shown in FIGS. 1 and 2, the slide fastener 100 includes a pair of left and right first and second fastener stringers (hereinafter, the fastener stringer is also simply referred to as a "stringer") 30A and 30B, one slider 40 for opening and closing between the first and second stringers 30A and 30B by a user moving it in the vertical direction, and a slide fastener opening / closing inserting member (hereinafter, referred to as an "opening / closing inserting member") 1 according to an embodiment of the present invention, formed at the lower end portions in the longitudinal direction (vertical direction) of the first and second stringers 30A and 30B. In this example, there is one slider 40 between the first and second stringers 30A and 30B, but there may be two or more.

[0017] Each of the first and second stringers 30A and 30B includes a vertically long strip-shaped fastener tape (hereinafter, also simply referred to as a "tape") 31a and 31b, a coiled fastener element (hereinafter, also simply referred to as an "element") 32 attached along the inner edge portion which is the opening / closing side edge portion in the width direction of each tape 31a and 31b, and an upper stopper 33 for restricting the upward movement of the slider 40.

[0018] Hereinafter, the tape 31a constituting the first stringer 30A may be referred to as the first tape, and the tape 31b constituting the second stringer 30B may be referred to as the second tape. In this example, the tapes 31a and 31b are formed by weaving or knitting polyamide fibers, polyester fibers, acrylic fibers, etc., and the element 32 is made of a synthetic resin such as polyester or nylon, but is not limited thereto. Further, the element 32 is not limited to a coil element, and may be of a type in which each element is independent.

[0019] The slider 40 includes a slider body 41 and a handle 42 connected to the slider body 41. Referring also to FIG. 3 which shows the side surface of the slider 40 by a dashed line, the slider body 41 includes an upper wing plate 43 disposed on the front side of the first and second stringers 30A and 30B, and a lower wing plate 44 disposed on the back side of the first and second stringers 30A and 30B. The upper wing plate 43 and the lower wing plate 44 are connected by a guide post 45 at the upper and lateral center therebetween, whereby a Y-shaped element guide path bifurcating upward is defined between the upper wing plate 43 and the lower wing plate 44.

[0020] The reference numeral 46 in FIGS. 1 and 3 is a handle holding portion to which the handle 42 is connected, and the handle holding portion 46 projects from the upper wing plate 43. In a state where the lower ends of the first and second stringers 30A and 30B shown in FIG. 1 are connected by a separation fitting 1 described later, when the user moves the slider body 41 upward with the handle 42, the left and right elements 32 are passed through the element guide path between the upper and lower wing plates 43 and 44 and engaged, and the space between the first and second stringers 30A and 30B is closed. When the slider body 41 is moved downward, the engagement of the left and right elements 32 is released, and the space between the first and second stringers 30A and 30B is opened.

[0021] On the left and right side portions below the upper wing plate 43, there are provided raised portions 43a (see FIG. 6) that bulge toward the lower wing plate 44 so that the left and right elements 32 do not come out of the element guide path. Also, on the left and right side portions below the lower wing plate 44, there are provided slightly raised portions 44a toward the upper wing plate 43. The interval T1 between these raised portions 43a and 44a is the minimum interval between the upper and lower wing plates 43 and 44, and this minimum interval T1 is smaller than the maximum thickness of the element 32 in the front-back direction and larger than the thickness of the tape 31.

[0022] The separation and insertion tool 1 is formed by injection molding or extrusion molding a thermoplastic resin such as polyacetal, polyamide, polypropylene, or polybutylene terephthalate onto a tape reinforcing portion 31c obtained by reinforcing the lower ends of the left and right tapes 31a and 31b with a thermoplastic resin. The tape reinforcing portion 31c is formed by welding a thermoplastic resin film such as polyamide or polyethylene to the lower ends of the left and right tapes 31a and 31b by ultrasonic processing or the like, or by infiltrating and solidifying a thermoplastic resin liquid. The tape reinforcing portion 31c is preferably provided over the entire length in the width direction of each tape 31a and 31b.

[0023] The separation and insertion tool 1 includes a first separation and insertion portion 10 provided at the lower end of the first stringer 30A and a second separation and insertion portion 20 provided at the lower end of the second stringer 30B. The first separation and insertion portion 10 and the second separation and insertion portion 20 can be connected and disconnected. In FIG. 1, the connected state of the first and second separation and insertion portions 10 and 20 is shown, and in FIG. 2, the disconnected state of the first and second separation and insertion portions 10 and 20 is shown enlarged.

[0024] FIG. 4 is a perspective view of the first separation and insertion portion 10 and the second separation and insertion portion 20. FIG. 5A is a front view of the first separation and insertion portion 10 as viewed from the front side, FIG. 5B is a rear view of the first separation and insertion portion 10 as viewed from the back side, and FIG. 5C is a right side view of the first separation and insertion portion 10 as viewed from the right side in the width direction.

[0025] As shown in FIGS. 1 to 2 and FIGS. 4 to 5C, the first separation and insertion portion 10 includes a vertically long butterfly bar 11 provided on the inner edge side in the width direction of the lower end of the first stringer 30A, a vertically long first reinforcing strip portion 12 provided away from the butterfly bar 11 to the left in the width direction and substantially parallel to the butterfly bar 11, and a first connecting portion 13 that connects the butterfly bar 11 and the first reinforcing strip portion 12 in the width direction.

[0026] In the front-back direction, the thickness of the butterfly bar 11 is slightly thicker than the thickness of the first tape 31a. Therefore, the front surface 11b and the back surface 11c of the butterfly bar 11 protrude slightly from the front surface and the back surface of the first tape 31a. The degree to which the front surface 11b and the back surface 11c of the butterfly bar 11 protrude from the front surface and the back surface of the tape 31 is the same as or slightly smaller than the degree to which the front surface and the back surface of the element 32 protrude from the front surface and the back surface of the tapes 31a and 31b.

[0027] The butterfly bar 11 has a protrusion 11a that protrudes rightward at the upper right end. The protrusion 11a engages with a notch 21c of the box bar 21b described later.

[0028] The butterfly bar 11 is inserted into and removed from a butterfly bar hole 25 of a box 21 of the second separation and insertion portion 20 described later, whereby the first separation and insertion portion 10 and the second separation and insertion portion 20 are connected and disconnected.

[0029] On the lower sides of the front surface 11b and the back surface 11c of the butterfly bar 11, recesses 16 and 17 that are recessed in a direction to reduce the thickness of the butterfly bar 11 in the front-back direction are provided respectively. The recesses 16 and 17 are located slightly above the lower end portions of the front surface 11b and the back surface 11c. Note that the recesses 16 and 17 do not necessarily have to be provided on both the front surface 11b and the back surface 11c of the butterfly bar 11, and may be provided on at least one of the front surface 11b and the back surface 11c. Among the recesses 16 and 17, the one provided on the front surface 11b is called a front-side recess 16, and the one provided on the back surface 11c is called a back-side recess 17.

[0030] The front-side recess 16 includes an upper inclined surface 16d that inclines toward the back side as it goes downward from the upper end portion of the front-side recess 16 in the insertion / removal direction (vertical direction) of the butterfly bar 11 to increase the thickness of the front-side recess 16, a lower inclined surface 16e that inclines toward the back side as it goes upward from the lower end portion of the front-side recess 16 in the insertion / removal direction of the butterfly bar 11 to increase the thickness of the front-side recess 16, and a parallel surface 16c that connects the upper inclined surface 16d and the lower inclined surface 16e and is parallel to the insertion / removal direction (vertical direction) and the width direction (left-right direction) of the butterfly bar 11.

[0031] Further, the rear concave portion 17 includes an upper inclined surface 17d that inclines toward the front side as it goes downward from the upper end portion of the rear concave portion 17 in the insertion / removal direction (vertical direction) of the butterfly bar 11 to increase the thickness of the rear concave portion 17, a lower inclined surface 17e that inclines toward the front side as it goes upward from the lower end portion of the rear concave portion 17 in the insertion / removal direction of the butterfly bar 11 to increase the thickness of the rear concave portion 17, and a parallel surface 17c that connects the upper inclined surface 17d and the lower inclined surface 17e and is parallel to the insertion / removal direction (vertical direction) and the width direction (left - right direction) of the butterfly bar 11.

[0032] The front concave portion 16 and the rear concave portion 17 are formed over the entire width of the front surface 11b and the rear surface 11c of the butterfly bar 11. Therefore, the front concave portion 16 and the rear concave portion 17 each penetrate the butterfly bar 11 in the width direction and have a left - hand opening 16a, 17a on the left side in the width direction and a right - hand opening 16b, 17b on the right side in the width direction. The parallel surface 16c, which is the bottom surface of the front concave portion 16, is located on the front side relative to the surface 13a of the first connecting portion 13 adjacent in the width direction. Therefore, a step 14 is formed between the parallel surface 16c of the front concave portion 16 and the surface 13a of the first connecting portion 13. On the other hand, the parallel surface 17c, which is the bottom surface of the rear concave portion 17, and the rear surface 13b of the first connecting portion 13 adjacent in the width direction are smoothly connected to be flush with each other, and both form the same plane.

[0033] Among the front surface 11b of the butterfly bar 11, a surface upper portion 18a located above the front concave portion 16 is a parallel surface parallel to the vertical direction and the width direction. Among the front surface 11b of the butterfly bar 11, a surface lower portion 18b located below the front concave portion 16 includes a parallel surface 18c, a first inclined surface 18d, and a second inclined surface 18e. The parallel surface 18c is connected to the lower end portion of the front concave portion 16 and extends parallel to the vertical direction and the width direction. The first inclined surface 18d is connected to the lower end portion of the parallel surface 18c and inclines toward the rear surface 11c side as it goes downward. The second inclined surface 18e connects the lower end portion of the first inclined surface 18d and the lower surface 11d of the butterfly bar 11 and inclines toward the rear surface 11c side as it goes downward. The inclination of the second inclined surface 18e is larger than the inclination of the first inclined surface 18d.

[0034] Of the back surface 11c of the butterfly bar 11, the upper back surface portion 19a located above the back recess 17 is a parallel surface parallel to the vertical direction and the width direction. Of the back surface 11c of the butterfly bar 11, the lower back surface portion 19b located below the back recess 17 includes a parallel surface 19c and an inclined surface 19d. The parallel surface 19c is connected to the lower end portion of the back recess 17 and extends parallel to the vertical direction and the width direction. The inclined surface 19d connects the lower end portion of the parallel surface 19c and the lower surface 11d of the butterfly bar 11, and inclines toward the surface 11b side as it goes downward. The inclined surface 19d connects the lower end portion of the first inclined surface 18d and the lower surface 11d of the butterfly bar 11.

[0035] The first reinforcing strip portion 12 is connected to the butterfly bar 11 via the first connecting portion 13, thereby playing a role of reinforcing the fixing of the butterfly bar 11 to the first tape 31a. The upper end of the first reinforcing strip portion 12 slightly protrudes above the upper end of the butterfly bar 11. The lower end of the butterfly bar 11 slightly protrudes below the lower end of the first reinforcing strip portion 12. The lateral width of the first reinforcing strip portion 12 is larger than the lateral width of the butterfly bar 11.

[0036] Prior to the molding of the first separation and insertion portion 10 including the first reinforcing strip portion 12, through holes (not shown) penetrating the first tape 31a in the front-back direction are provided in portions of the left first tape 31a corresponding to the first reinforcing strip portion 12 and the first connecting portion 13. By connecting the thermoplastic resin between the front and back of the first tape 31a through these through holes, the first reinforcing strip portion 12 and the first connecting portion 13 are firmly fixed to the front and back of the first tape 31a, and the peel strength of the first reinforcing strip portion 12 and the first connecting portion 13 with respect to the first tape 31a is increased. Since the first reinforcing strip portion 12 and the first connecting portion 13 are firmly fixed to the first tape 31a in this way, the fixing of the butterfly bar 11 to the first tape 31a becomes strong.

[0037] FIG. 6A is a front view of the second separation and insertion portion 20 as viewed from the front side, FIG. 6B is a rear view of the second separation and insertion portion 20 as viewed from the back side, and FIG. 6C is a left side view of the second separation and insertion portion 20 as viewed from the left side in the width direction. FIG. 7A is a front view of the second separation and insertion portion 20 as viewed from the front side, showing the box body 21a in the direction of the arrow of the A-A cross section in FIG. 6C. FIG. 7B is a rear view of the second separation and insertion portion 20 as viewed from the back side, showing the box body 21a in the direction of the arrow of the B-B cross section in FIG. 6C. FIG. 7C is a left side view of the second separation and insertion portion 20 as viewed from the left side, showing the box body 21a in the direction of the arrow of the C-C cross section in FIG. 6A.

[0038] As shown in FIGS. 1 to 2 and FIGS. 6A to 7C, the second separation and insertion portion 20 includes a box 21 provided to cover the inner edge side in the width direction of the lower end portion of the second stringer 30B, a second reinforcing strip portion 22 extending upward away from the right side surface of the box 21 in the rightward direction in the width direction, and a second connecting portion 23 connecting the box 21 and the second reinforcing strip portion 22.

[0039] The box 21 has a box body 21a having a butterfly rod hole 25 (see FIG. 4 etc.) in the left half portion through which the butterfly rod 11 can be inserted and removed in the vertical direction (the longitudinal direction of the slide fastener 100), and a box rod 21b protruding upward from the right half portion of the upper surface of the box body 21a.

[0040] In the front-back direction, the box body 21a is formed thicker than the box rod 21b and the second reinforcing strip portion 22. In the front-back direction, the box rod 21b has the same thickness as the butterfly rod 11. When the butterfly rod 11 of the first separation and insertion portion 10 is inserted into the butterfly rod hole 25 of the box body 21a of the second separation and insertion portion, the first and second separation and insertion portions 10, 20 are in a connected state (see FIG. 1), and the lower end portions of the first and second stringers 30A, 30B are in an aligned state. When the butterfly rod 11 is withdrawn from the butterfly rod hole 25 of the box body 21a, the connection between the first and second separation and insertion portions 10, 20 is released.

[0041] The box bar 21b is provided along the inner edge side in the width direction of the second stringer 30B and is integrally formed with the box body 21a. The box bar 21b has, at its upper left end, a notch 21c (see FIG. 2) for receiving the protrusion 11a of the butterfly bar 11 in the connected state with the first separation and insertion portion 10. In the connected state of the first and second separation and insertion portions 10 and 20, the upper end of the box bar 21b is located slightly below the upper end of the butterfly bar 11.

[0042] The second reinforcing strip portion 22 has substantially the same form as the first reinforcing strip portion 12 except for the base portion of the second reinforcing strip portion 22 that is connected to the box 21, and the vertical length and the front-back thickness are the same as those of the first reinforcing strip portion 12.

[0043] Prior to the injection molding of the second separation and insertion portion 20, through holes (not shown) that penetrate the second tape 31b in the front-back direction are provided in portions of the right second tape 31b corresponding to the second reinforcing strip portion 22 and the second connecting portion 23. Then, by connecting the thermoplastic resin through these through holes between the front and back of the second tape 31b, the second reinforcing strip portion 22 and the second connecting portion 23 are firmly fixed to the front and back of the second tape 31b, and the peel strength of the second reinforcing strip portion 22 and the second connecting portion 23 with respect to the second tape 31b is increased. Since the second reinforcing strip portion 22 and the second connecting portion 23 are firmly fixed to the second tape 31b in this way, the fixing of the box 21 to the second tape 31b becomes strong.

[0044] As shown in Fig. 2, in the region between the butterfly bar 11 and the first reinforcing strip 12 in the first separation and insertion portion 10 and above the box body 21a, and in the region between the box bar 21b and the second reinforcing strip 22 in the second separation and insertion portion 20 and above the box body 21a, there are thin-walled guide portions 15 and 24 that are relatively thin in thickness with respect to the butterfly bar 11, box bar 21b, and the first and second reinforcing strips 12 and 22 that bulge from the front and back surfaces of the tape 31. The slider 40 can move from the state shown in Fig. 1 to the lowermost position where it abuts against the box body 21a. When the slider 40 is lowered to the lowermost position, the raised portions 43a and 44a (see Fig. 3) on the left and right sides of the upper and lower wing plates 43 and 44 of the slider 40 are guided by the thin-walled guide portions 15 and 24 of the first and second separation and insertion portions 10 and 20. When the slider 40 is moved from the state shown in Fig. 1 to the lowermost position where it abuts against the separation and insertion tool 1, the butterfly bar 11 of the first separation and insertion portion 10 is pulled out from the box body 21a, and further the butterfly bar 11 is pulled upward through the element guide path between the upper and lower wing plates 43 and 44 of the slider 40, so that the connection between the first separation and insertion portion 10 and the second separation and insertion portion 20 can be released, whereby the first stringer 30A and the second stringer 30B are separated. At this time, the slider 40 remains on the second stringer 30B.

[0045] The box 21 of the first embodiment includes a box bar 21b arranged in parallel on the right side (the second tape 31b side) with respect to the upper part of the butterfly bar 11 extending vertically, and a box body 21a having a butterfly bar hole 25 into which the lower part of the butterfly bar 11 can be inserted and removed. A butterfly bar hole 25 is formed in the upper surface of the box body 21a on the left side (the first tape 31a side), and the box bar 21b is joined in a state of protruding upward in the upper surface of the box body 21a on the right side (the second tape 31b side) in the left-right direction.

[0046] The box body 21a is a hexahedron having front, back, left, right, top, and bottom faces. In the illustrated example, each face is formed in a planar shape. The planar shape includes not only a plane but also a surface that curves in an arc shape (a surface that bulges in an arc shape and a surface that concaves in an arc shape). For example, in the illustrated example, the front and back surfaces are surfaces that bulge in the arc-shaped surfaces (more specifically, surfaces that gradually bulge toward the front side from both ends to the middle of the full width). Further, the box body 21a is provided with a tape groove 61 into which the first tape 31a is inserted on the left side surface on the first tape 31a side among the left and right side surfaces. The tape groove 61 is a groove that extends in the vertical direction and is open upward and closed downward. A butterfly bar hole 25 communicates with the second tape 31b side with respect to the tape groove 61, and the upper part of the butterfly bar hole 25 is open. On the other hand, the lower part of the butterfly bar hole 25 is closed on the first tape 31a side, and the second tape 31b side penetrates and a slide hole 63 is provided.

[0047] The box body 21a includes a vertically extending wall 53 that extends downward from the lower end of the box bar 21b, a front side body wall 54 and a back side body wall 55 that project parallel to the first tape 31a side in the left-right direction from both front and back ends of the vertically extending wall 53, a joining wall 56 that joins the ends on the first tape 31a side of the front side body wall 54 and the back side body wall 55 at the lower end in the entire vertical length of each other, and groove walls 57, 57 that project so as to narrow the front-back interval formed between the front side body wall 54 and the back side body wall 55 from the ends on the first tape 31a side of the front side body wall 54 and the back side body wall 55. And the space formed between the pair of front-back groove walls 57, 57 becomes the tape groove 61. Each groove wall 57 in the illustrated example is formed over the entire range above the joining wall 56 in the entire vertical length of the front side body wall 54 and the back side body wall 55. Therefore, the joining wall 56 is continuous below the pair of front-back groove walls 57, 57. Further, the box 21 of the present embodiment has an asymmetric front-back shape, and the tape groove 61 is disposed on the back side with respect to the center in the front-back direction of the box 21 and is disposed closer to the back side body wall 55 than the front side body wall 54.

[0048] The upper and lower extension walls 53 are rod-shaped with a rectangular cross-section. Also, the left and right width of the upper and lower extension walls 53 is formed wider than the box rod 21b in the illustrated example. Among the left and right side surfaces of the upper and lower extension walls 53, the surface on the first tape 31a side (the surface on the butterfly rod hole 25 side) is formed substantially flush with the corresponding surface of the box rod 21b, and the surface on the second tape 31b side among the left and right side surfaces of the upper and lower extension walls 53 protrudes further to the right than the box rod 21b. The upper and lower width of the upper and lower extension walls 53 is the same as the upper and lower width of the box rod 21b. Note that the front and rear body walls 54 and 55 that protrude in the width direction (the first tape 31a side) from both the front and back ends of the upper and lower extension walls 53 are both plate-shaped.

[0049] The joining wall 56 includes a groove closing portion 56a that closes the lower part of the tape groove 61 and a hole closing portion 56b that closes the first tape 31a side below the butterfly rod hole 25. Therefore, the space surrounded by the joining wall 56 (hole closing portion 56b), the upper and lower extension walls 53, the front body wall 54, and the rear body wall 55 becomes a slide hole 63 into which a first slide 7 (see FIG. 15) for resin molding, which will be described later, is inserted, and the slide hole 63 communicates with the butterfly rod hole 25.

[0050] The inner surface that constitutes the butterfly rod hole 25 of the box 21 includes a front side surface 25a that is constituted by the back surface of the front body wall 54 and faces the front surface 11b of the butterfly rod 11, a back side surface 25b that is constituted by the front surface of the rear body wall 55 and faces the back surface 11c of the butterfly rod 11, a right side surface 25c that is constituted by the side surface (left side surface) on the first tape 31a side of the upper and lower extension walls 53 and faces the side surface (right side surface) on the second tape 31b side of the butterfly rod 11, and a pair of left side surfaces 25d, 25d that are constituted by the side surfaces (right side surfaces) on the second tape 31b side of the pair of groove walls 57, 57 and face the side surface (left side surface) on the first tape 31a side of the butterfly rod. The pair of left side surfaces 25d, 25d are separated from each other in the front and back direction because the tape groove 61 is interposed between them in the front and back direction.

[0051] Of the inner surfaces constituting the butterfly bar holes 25 of the box 21, on the front side surface 25a and the back side surface 25b facing the front surface 11b and the back surface 11c of the butterfly bar 11, convex portions 26 and 27 that can engage with the front side concave portion 16 and the back side concave portion 17 of the butterfly bar 11 are provided respectively. Note that the convex portions 26 and 27 do not necessarily have to be provided on both the front side surface 25a and the back side surface 25b, and it is sufficient to be provided on at least one of the front side surface 25a and the back side surface 25b. Among the convex portions 26 and 27, the one provided on the front side surface 25a (the back wall of the front side barrel wall 54) is called the front side convex portion 26, and the one provided on the back side surface 25b is called the back side convex portion 27.

[0052] As shown in FIGS. 7A, 7B, and 7C, with respect to the plane P perpendicular to the insertion and extraction direction (vertical direction) of the butterfly bar 11 passing through the central portions of the front side convex portion 26 and the back side convex portion 27 in the insertion and extraction direction of the butterfly bar 11, the front side convex portion 26 and the back side convex portion 27 each have an asymmetric shape.

[0053] More specifically, the front side convex portion 26 includes an upper inclined surface 26a that inclines toward the back side as it goes downward from the upper end portion of the front side convex portion 26 in the insertion and extraction direction (vertical direction) of the butterfly bar 11 to increase the thickness of the front side convex portion 26, and a lower inclined surface 26b that inclines toward the back side as it goes upward from the lower end portion of the front side convex portion 26 in the insertion and extraction direction of the butterfly bar 11 to increase the thickness of the front side convex portion 26. The inclination of the upper inclined surface 26a is greater than the inclination of the lower inclined surface 26b.

[0054] Also, the back side convex portion 27 includes an upper inclined surface 27a that inclines toward the front side as it goes downward from the upper end portion of the back side convex portion 27 in the insertion and extraction direction (vertical direction) of the butterfly bar 11 to increase the thickness of the back side convex portion 27, and a lower inclined surface 27b that inclines toward the front side as it goes upward from the lower end portion of the back side convex portion 27 in the insertion and extraction direction of the butterfly bar 11 to increase the thickness of the back side convex portion 27. The inclination of the upper inclined surface 27a is greater than the inclination of the lower inclined surface 27b.

[0055] In this way, the slopes of the upper inclined surfaces 26a and 27a that come into contact when the flap bar 11 is inserted into the flap bar hole 25 are made relatively steep, and the slopes of the lower inclined surfaces 26b and 27b that come into contact when the flap bar 11 is pulled out of the flap bar hole 25 are set to be relatively gentle. Thus, as will be described later, the force Fin required to insert the flap bar 11 into the flap bar hole 25 is made greater than the force Fout required to pull the flap bar 11 out of the flap bar hole 25.

[0056] Further, the front-side convex portions 26 and the back-side convex portions 27 each connect the upper inclined surfaces 26a and 27a and the lower inclined surfaces 26b and 27b, and include parallel surfaces 26c and 27c that are parallel to the insertion / extraction direction (vertical direction) and the width direction (left-right direction) of the flap bar 11. These parallel surfaces 26c and 27c are positioned so as to intersect the above-described plane P.

[0057] As described above, the front-side concave portion 16 and the back-side concave portion 17 of the flap bar 11 are formed over the entire length in the width direction of the flap bar 11, whereas the front-side convex portion 26 and the back-side convex portion 27 of the box 21 are formed over only a part in the width direction, not the entire length in the width direction, of the flap bar hole 25. The length M1 in the width direction of the front-side concave portion 16 and the back-side concave portion 17 (see FIGS. 5A and 5B) is greater than the length M2 in the width direction of the front-side convex portion 26 and the back-side convex portion 27 (see FIGS. 7A and 7B) (M1 > M2). Also, the vertical length N1 of the front-side concave portion 16 and the back-side concave portion 17 (see FIGS. 5A and 5B) and the vertical length N2 of the front-side convex portion 26 and the back-side convex portion 27 (see FIGS. 7A and 7B) are substantially equal (N1 ≈ N2).

[0058] FIG. 8 is a partial cross-sectional view showing a state in which the flap bar 11 is inserted into the flap bar hole 25 of the box 21, as viewed from the width direction. In FIG. 8, while the box body 21a of the box 21 is shown, the box bar 21b is omitted from the drawing. As shown in FIG. 8, in a state where the flap bar 11 is completely inserted into the flap bar hole 25 of the box 21, the front-side convex portion 26 and the back-side convex portion 27 of the box 21 engage with the front-side concave portion 16 and the back-side concave portion 17 of the flap bar 11, so that the flap bar 11 is prevented from coming out of the box 21. Therefore, after the flap bar 11 is combined with the box 21, the flap bar 11 does not shift, so that element misalignment is less likely to occur and the slider 40 can be easily pulled up.

[0059] Here, below the front concave portion 16 and the back concave portion 17 of the butterfly rod 11, the portion with the largest dimension in the front-back direction is the portion between the pair of parallel surfaces 18c and 19c on the front and back, and the dimension in the front-back direction of this portion is L1. Also, the portion with the smallest dimension in the front-back direction among the butterfly rod holes 25 is the portion between the parallel surfaces 26c and 27c of the pair of convex portions 26 and 27 on the front and back, and the dimension in the front-back direction of this portion is L2. And since the size relationship between these dimensions L1 and L2 is L1 > L2, when inserting the butterfly rod 11 into the butterfly rod hole 25 from above (the right side in FIG. 8), the lower end portion (the left end portion in FIG. 8) of the butterfly rod 11 interferes with the pair of convex portions 26 and 27 on the front and back of the butterfly rod hole 25. L1 is preferably set so that the gap with the butterfly rod hole 25 becomes small in order to prevent rattling when inserting the butterfly rod 11.

[0060] More specifically, when inserting the butterfly rod 11 into the butterfly rod hole 25, the first and second inclined surfaces 18d and 18e on the front side and the inclined surface 19d on the back side of the butterfly rod 11 come into contact with the upper inclined surfaces 26a and 27a of the pair of convex portions 26 and 27 on the front and back. By providing a plurality of inclined surfaces 26a, 27a, 18d, 18e, and 19d on the box 21 and the butterfly rod 11, the butterfly rod 11 is smoothly guided between the pair of convex portions 26 and 27 on the front and back. Then, the parallel surfaces 18c and 19c on the front and back of the butterfly rod 11 come into contact with the upper inclined surfaces 26a and 27a and the parallel surfaces 26c and 27c of the convex portions 26 and 27, and as the butterfly rod 11 pushes the box 21 outward in the front-back direction and climbs over the convex portions 26 and 27, the front concave portion 16 and the back concave portion 17 of the butterfly rod 11 engage with the front convex portion 26 and the back convex portion 27 of the box 21.

[0061] Here, as described above, the inclination of the upper inclined surfaces 26a and 27a is larger than the inclination of the lower inclined surfaces 26b and 27b, and since the inclination of the upper inclined surfaces 26a and 27a that the butterfly rod 11 contacts when inserting into the butterfly rod hole 25 is relatively steep, the force Fin required to insert the butterfly rod 11 into the butterfly rod hole 25, that is, the force required for the butterfly rod 11 to climb over and engage with the convex portions 26 and 27, is set relatively large. Specifically, Fin is set to 4 to 6 N. The measurement method of Fin will be described later.

[0062] Therefore, since a relatively large force is required to completely insert the shutter rod 11 into the shutter rod hole 25, the user can obtain a feeling of insertion or a clicking feeling as if it fits firmly due to the resistance and sound when the shutter rod 11 gets over the convex portions 26 and 27, and can appropriately recognize that the shutter rod 11 has been completely inserted into the box 21.

[0063] In particular, in the present embodiment, since the concave portions 16 and 17 are respectively provided on the front surface 11b and the back surface 11c of the shutter rod 11, and the convex portions 26 and 27 are respectively provided on the front side surface 25a and the back side surface 25b of the shutter rod hole 25, the force Fin required to engage the convex portions 26 and 27 with the concave portions 16 and 17 becomes large, and the user can more reliably obtain a feeling of insertion or a clicking feeling as if it fits firmly, and can more appropriately recognize that the shutter rod 11 has been completely inserted into the box 21. When the positions of the concave portions 16 and 17 in the insertion and extraction direction are separated, since the timing when the concave portion 16 engages and the timing when the concave portion 17 engages are shifted, it is preferable that the positions of the concave portions 16 and 17 in the insertion and extraction direction are the same or close to each other. The corresponding convex portions 26 and 27 are the same.

[0064] Further, the convex portions 26 and 27 smoothly connect the upper inclined surfaces 26a and 27a and the lower inclined surfaces 26b and 27b, and have parallel surfaces 26c and 27c parallel to the insertion and extraction direction (vertical direction) and the width direction (horizontal direction) of the shutter rod 11, so the convex portions 26 and 27 and the concave portions 16 and 17 can be engaged with less play.

[0065] Further, the concave portions 16 and 17 penetrate the shutter rod 11 in the width direction and have left openings 16a and 17a and right openings 16b and 17b (see FIGS. 5A and 5B). Therefore, even if dust such as human dirt or fibers of clothes enters the concave portions 16 and 17 by any chance, it can be easily discharged from the left openings 16a and 17a and the right openings 16b and 17b. If dust as described above accumulates in the concave portions 16 and 17, it is not preferable because the user cannot appropriately obtain a feeling of insertion when inserting the shutter rod 11 into the shutter rod hole 25.

[0066] Also, as described above, since the length M1 in the width direction of the concave portions 16 and 17 (see FIGS. 5A and 5B) is set to be larger than the length M2 in the width direction of the convex portions 26 and 27 (see FIGS. 7A and 7B), the convex portions 26 and 27 can easily fit into the concave portions 16 and 17. For example, the butterfly rod 11 may be inserted while being inclined in the width direction (left - right direction) with respect to the butterfly rod hole 25. Even in this case, the concave portions 16 and 17 of the butterfly rod are surely engaged with the convex portions 26 and 27 of the butterfly rod hole 25. Further, even when the convex portions 26 and 27 come into contact with the concave portions 16 and 17 after the engagement, since the convex portions 26 and 27 elastically deform in the width direction within the concave portions 16 and 17, it is possible to prevent the generation of local stress in the convex portions 26 and 27.

[0067] Also, when the concave portions 16 and 17 are engaged with the convex portions 26 and 27, the gap in the width direction (left - right direction) between the concave portions 16 and 17 and the convex portions 26 and 27 is larger than the gap in the insertion and extraction direction (up - down direction) of the butterfly rod 11 between the concave portions 16 and 17 and the convex portions 26 and 27. With such a configuration, a feeling of a snap - fit insertion when the concave portions 16 and 17 are engaged with the convex portions 26 and 27 can be obtained, and the convex portions 26 and 27 can easily fit into the concave portions 16 and 17. Note that the former width - direction gap is the difference M1 - M2 between the length M1 in the width direction of the concave portions 16 and 17 (see FIGS. 5A and 5B) and the length M2 in the width direction of the convex portions 26 and 27 (see FIGS. 7A and 7B), and is relatively large. The latter up - down direction gap is the difference N1 - N2 between the length N1 in the up - down direction of the concave portions 16 and 17 (see FIGS. 5A and 5B) and the length N2 in the up - down direction of the convex portions 26 and 27 (see FIGS. 7A and 7B), and is zero or very small.

[0068] When pulling out the butterfly rod 11 upward (the right side in FIG. 8) from the state of FIG. 8, similar to the insertion time, the lower end portion (the left end portion in FIG. 8) of the butterfly rod 11 interferes with the pair of front - and - back convex portions 26 and 27 of the butterfly rod hole 25.

[0069] More specifically, when the butterfly rod 11 is pulled out from the butterfly rod hole 25, the lower inclined surfaces 16e and 17e of the front and back concave portions 16 and 17 of the butterfly rod 11 abut against the lower inclined surfaces 26b and 27b of the pair of front and back convex portions 26 and 27. By providing a plurality of inclined surfaces 26b, 27b, 16e, and 17e on the box 21 and the butterfly rod 11, the butterfly rod 11 is smoothly guided between the pair of front and back convex portions 26 and 27. Then, the front and back parallel surfaces 18c and 19c of the butterfly rod 11 abut against the lower inclined surfaces 26b and 27b and the parallel surfaces 26c and 27c of the convex portions 26 and 27, and the butterfly rod 11 rides over the convex portions 26 and 27 while pushing the box 21 outward in the front and back directions, thereby releasing the engagement between the front concave portion 16 and the back concave portion 17 of the butterfly rod 11 and the front convex portion 26 and the back convex portion 27 of the box 21.

[0070] Here, as described above, the inclination of the lower inclined surfaces 26b and 27b is smaller than the inclination of the upper inclined surfaces 26a and 27a, and the inclination of the lower inclined surfaces 26b and 27b that come into contact when the butterfly rod 11 is pulled out from the butterfly rod hole 25 is relatively gentle. Therefore, the force Fout required to pull the butterfly rod 11 out of the butterfly rod hole 25, that is, the force required for the butterfly rod 11 to ride over the convex portions 26 and 27 and release the engagement, is set to be relatively small. Specifically, Fout is set to be smaller than Fin. The method for measuring Fout will be described later.

[0071] [Second Embodiment] In the first embodiment, an example in which the first separation and insertion portion 10 is provided with the first reinforcing strip portion 12 and the first connecting portion 13, and the second separation and insertion portion 20 is provided with the second reinforcing strip portion 22 and the second connecting portion 23 has been described. However, as in the second embodiment described below, the first separation and insertion portion 10 may not have the first reinforcing strip portion 12 and the first connecting portion 13, and the second separation and insertion portion 20 may not have the second reinforcing strip portion 22 and the second connecting portion 23.

[0072] FIG. 9 is a perspective view showing an enlarged view of the disconnected state of the first and second disengagement insertion portions 10 and 20 in the slide fastener 100 of the second embodiment. FIG. 10 is a perspective view of the first disengagement insertion portion 10 and the second disengagement insertion portion 20. FIG. 11A is a front view of the first disengagement insertion portion 10 as viewed from the front side, FIG. 11B is a rear view of the first disengagement insertion portion 10 as viewed from the back side, and FIG. 11C is a right side view of the first disengagement insertion portion 10 as viewed from the right side in the width direction. FIG. 12A is a front view of the second disengagement insertion portion 20 as viewed from the front side, FIG. 12B is a rear view of the second disengagement insertion portion 20 as viewed from the back side, and FIG. 12C is a left side view of the second disengagement insertion portion 20 as viewed from the left side in the width direction. FIG. 13A is a front view of the second disengagement insertion portion 20 as viewed from the front side, showing the box 21 in the direction of the arrow of the A-A cross section in FIG. 12C. FIG. 13B is a rear view of the second disengagement insertion portion 20 as viewed from the back side, showing the box 21 in the direction of the arrow of the B-B cross section in FIG. 12C. FIG. 13C is a left side view of the second disengagement insertion portion 20 as viewed from the left side, showing the box 21 in the direction of the arrow of the C-C cross section in FIG. 12A.

[0073] Since the butterfly bar 11 of the first disengagement insertion portion 10 and the box 21 of the second disengagement insertion portion 20 according to the second embodiment are substantially the same as those of the first embodiment in most parts, the same reference numerals are given to the same parts to simplify or omit the description.

[0074] As shown in FIG. 9 and the like, the box bar 21b is provided with a locking portion 21d that protrudes toward the first tape 31a from the upper end portion on the surface of the left and right side surfaces of the box bar 21b on the first tape 31a side. The locking portion 21d is formed at the central portion in the front-rear direction of the box bar 21b. Further, as shown in FIG. 11C, a locking groove portion 11e for accommodating the locking portion 21d is recessed and formed at the upper end portion on the surface of the left and right side surfaces of the butterfly bar 11 on the second tape 31b side.

[0075] FIG. 14 is a partial cross-sectional view showing a state in which the butterfly rod 11 is inserted into the butterfly rod hole 25 of the box 21 as viewed from the width direction. In FIG. 14, while the box body 21a of the box 21 is shown, the box rod 21b is not shown. Similar to the first embodiment, as shown in FIG. 14, in a state where the butterfly rod 11 is completely inserted into the butterfly rod hole 25 of the box 21, the front convex portion 26 and the back convex portion 27 of the box 21 are engaged with the front concave portion 16 and the back concave portion 17 of the butterfly rod 11, so that the butterfly rod 11 is prevented from coming out of the box 21. Therefore, after the butterfly rod 11 is combined with the box 21, the butterfly rod 11 does not shift, so that element misalignment is less likely to occur and the slider 40 can be easily pulled up.

[0076] Similar to the first embodiment, also in this embodiment, the inclination of the upper inclined surfaces 26a, 27a is larger than the inclination of the lower inclined surfaces 26b, 27b, and the inclination of the upper inclined surfaces 26a, 27a that the butterfly rod 11 contacts when inserted into the butterfly rod hole 25 is relatively steep. Therefore, the force Fin required to insert the butterfly rod 11 into the butterfly rod hole 25, that is, the force required for the butterfly rod 11 to overcome the convex portions 26, 27 and engage, is set relatively large. Specifically, Fin is set to 4 to 6 N. The method for measuring Fin will be described later.

[0077] Therefore, since a relatively large force is required to completely insert the butterfly rod 11 into the butterfly rod hole 25, the user can obtain an insertion feeling and a click feeling due to the resistance feeling and sound when the butterfly rod 11 overcomes the convex portions 26, 27, and can appropriately recognize that the butterfly rod 11 has been completely inserted into the box 21.

[0078] When pulling out the butterfly rod 11 upward (the right side in FIG. 14) from the state of FIG. 14, similar to the insertion time, the lower end portion (the left end portion in FIG. 14) of the butterfly rod 11 interferes with the pair of front and back convex portions 26, 27 of the butterfly rod hole 25.

[0079] Similar to the first embodiment, also in the second embodiment, the slopes of the lower inclined surfaces 26b and 27b are smaller than the slopes of the upper inclined surfaces 26a and 27a, and since the slopes of the lower inclined surfaces 26b and 27b that come into contact when pulling out the butterfly bar 11 from the butterfly bar hole 25 are relatively gentle, the force Fout required to pull out the butterfly bar 11 from the butterfly bar hole 25, that is, the force required for the butterfly bar 11 to overcome the convex portions 26 and 27 and release the engagement, is set to be relatively small. Specifically, Fout is set to be smaller than Fin. The method for measuring Fin will be described later.

[0080] Other effects according to the second embodiment are the same as those of the first embodiment.

[0081] [Method for manufacturing a box] In the method for manufacturing the box 21 according to the first and second embodiments of the present invention described above, injection molding using resin as a raw material is used. Hereinafter, the method for manufacturing the box 21 of the second embodiment will be described, but the same method can also be applied to the box 21 of the first embodiment (the portion of the box body 21a and the box bar 21b excluding the second reinforcing strip portion 22 and the second connecting portion 23).

[0082] FIG. 15 is a perspective view showing a molding die used in the method for manufacturing a box. FIG. 16(a) is a side view of the first and second slides in the mold-open state as viewed from the width direction, FIG. 16(b) is a front view of the first and second slides in the mold-open state as viewed from the front side, and FIG. 16(c) is a top view of the first slide as viewed from above. FIG. 17(a) is a side view of the first and second slides in the mold-closed state as viewed from the width direction, and FIG. 17(b) is a front view of the first and second slides in the mold-closed state as viewed from the front side. FIGS. 18(a) to (g) are process diagrams showing the procedure of the injection molding method.

[0083] As shown in FIG. 15, the injection molding die used in this manufacturing method includes a fixed die 5, a movable die 6 that is supported so as to be reciprocally movable in the front-rear direction with respect to the fixed die 5, and first and second slides 7 and 8 that are reciprocally movable in the vertical direction with respect to the fixed die 5.

[0084] In the injection molding die, in the mold-closed state, a cavity 91 as a space corresponding to the shape of the box 21, a gate 92 that forms the outer shape of the gate resin part 92r and serves as a passage leading to the cavity 91, and a runner 93 serving as a passage leading to the gate 92 are formed.

[0085] The cavity 91 includes a box bar recess 21bx that forms the outer shape of the box bar 21b, a box body recess 21ax that forms the outer surface (so-called six sides) of the outer shape of the box body 21a, and convex parts (a tape groove convex part 61x, a butterfly bar hole convex part 25x, a slide hole convex part 63x) that form the inner surface (tape groove 61, butterfly bar hole 25, slide hole 63) of the outer shape of the box body 21a.

[0086] The box body recess 21ax is composed of an upper and lower extension wall recess 53x that forms the outer surface of the upper and lower extension walls 53 (the side surface on the second tape 31b side among the left and right side surfaces of the box body 21a, a part of the front surface of the box body 21a, and a part of the back surface of the box body 21a), a front side body wall recess 54x and a back side body wall recess 55x that form the outer surfaces of the front side body wall 54 and the back side body wall 55 respectively, a joint wall recess 56x that forms the outer surface of the joint wall 56 (a part of the back surface and a part of the side surface of the box body 21a), and a groove wall recess 57x that forms the outer surface of the groove wall 57 (a part of the side surface of the box body 21a). In FIG. 15, the front side body wall recess 54x is not shown, but the front side body wall recess 54x is provided in the movable die 6 so as to face the back side body wall recess 55x.

[0087] The convex parts include a tape groove convex part 61x that forms the tape groove 61, a butterfly bar hole convex part 25x (a non-tape groove side partial convex part 25y and a groove side partial convex part 25z) that forms the butterfly bar hole 25, and a slide hole convex part 63x that forms the slide hole 63.

[0088] In this embodiment, the parting line formed in the box 21 that becomes the product is at the middle position of the full height in the front-back direction of the box 21. Therefore, the fixed mold 5 and the movable mold 6 are formed in a front-back symmetric shape. On the surface of the fixed mold 5 (the surface that abuts against the movable mold 6), there are a box bar semi-recess 21by which is the back half of the box bar recess 21bx, and among the box body semi-recesses 21ay which are the back halves of the box body recesses 21ax, a back side body wall recess 55x, a vertical extension wall semi-recess 53y which is the back half of the vertical extension wall recess 53x, and a runner semi-recess 93y which is the back half of the runner 93 are formed in a sunken state.

[0089] Also, on the surface of the fixed mold 5, a tape placement semi-recess 31by which is the back half of the tape placement recess 31bx for placing the second tape 31b is formed in a sunken state so as to communicate laterally (on the side opposite to the runner semi-recess 93y) and vertically with the box bar semi-recess 21by and the vertical extension wall semi-recess 53y. The depth of the tape placement semi-recess 31by is set to half of the thickness of the second tape 31b. Also, the end of the second tape 31b that fixes the element 32 among the left and right ends is formed thicker in the thickness direction of the tape than the other parts. In order to position this thick part, a part (positioning part) 31bz of the tape placement semi-recess 31by is formed deeper.

[0090] Also, on the surface of the fixed mold 5, first and second reciprocating recesses 7y, 8y for moving the back halves of the first and second slides 7, 8 that reciprocate are formed so as to communicate vertically and also with the box body semi-recess 21ay. More specifically, the first and second reciprocating recesses 7y, 8y are formed to communicate with the box body semi-recess 21ay on the side opposite to the tape placement semi-recess 31by in the left-right direction.

[0091] The first reciprocating recess 7y communicates with the vertical extension wall semi-recess 53y on the side opposite to the tape placement semi-recess 31by and also communicates downward with the back side body wall recess 55x.

[0092] The second reciprocating recess 8y is formed at a distance from the tape placement semi-recess 31by on the side opposite to the box bar semi-recess 21by. More specifically, the second reciprocating recess 8y is formed laterally with respect to the wall 21bz on the side opposite to the tape placement semi-recess 31by among the left and right walls constituting the box bar semi-recess 21by. Further, the second reciprocating recess 8y is formed in communication with the back body wall recess 55x in the box body semi-recess 21ay upward and laterally (on the side opposite to the vertical extension wall semi-recess 53y).

[0093] Since the movable mold 6 has a symmetrical shape with respect to the fixed mold 5, on the surface of the movable mold 6 (the surface that abuts against the fixed mold 5), a front body wall recess 54x, the front half of the vertical extension wall recess 53x, the front half of the box bar recess 21bx, the front half of the tape placement recess 31bx, and the front half of the runner 93 are formed.

[0094] The first slide 7 includes a first base portion 71 that is on the lower surface side of the box body 21a and mainly forms the lower surface of the joining wall 56 (more specifically, the end portion on the side of the butterfly bar hole 25 and the joining wall 56 among the lower surface sides of the vertical extension walls 53), a first slide main body portion 72 that protrudes upward from the first base portion 71 in the left-right direction from the side of the tape placement semi-recess 31by, and a first side surface forming portion 73 that is on the side surface of the box body 21a and forms the side surface of the joining wall 56 (the side surface on the tape groove 61 side) and protrudes upward from the first base portion 71.

[0095] The first slide main body portion 72 is in the shape of a rod extending vertically, and includes a slide hole convex portion 63x that protrudes upward from the first base portion 71 and forms a slide hole 63, and an anti-tape groove side portion convex portion 25y that forms a portion of the butterfly bar hole convex portion 25x on the side opposite to the tape groove 61 and protrudes upward from the slide hole convex portion 63x. The upper end surface of the anti-tape groove side portion convex portion 25y is the surface that abuts against the wall 21bz on the side opposite to the tape placement semi-recess 31by among the left and right walls constituting the box bar semi-recess 21by.

[0096] The anti-tape groove side portion convex part 25y has a first base part 25ya that connects to the slide hole convex part 63x and extends upward, and a first tip part 25yb that connects to the first base part 25ya and extends upward.

[0097] The first base part 25ya extends upward as a whole from the upper end part of the slide hole convex part 63x. Therefore, the cross-sectional shape of the first base part 25ya is a bar shape with a cross-sectional rectangle that is substantially the same as the cross-sectional shape of the slide hole convex part 63x.

[0098] The first tip part 25yb is a bar shape with a cross-sectional rectangle, and it extends upward from the portion on the second tape 31b side (the tape placement concave part 31bx side for placing the second tape 31b) among the upper end parts of the first base part 25ya, rather than the whole upper end part of the first base part 25ya. Therefore, the front-back direction thickness of the first tip part 25yb is equal to the front-back direction thickness of the first base part 25ya, but the left-right direction width of the first tip part 25yb is smaller than the left-right direction width of the first base part 25ya. Therefore, the anti-tape groove side portion convex part 25y has a stepped bar shape formed by the first base part 25ya with a large left-right direction width and the first tip part 25yb with a small left-right direction width.

[0099] Furthermore, on the first tape 31a side (the runner 93 side) among the upper end parts of the first base part 25ya, a first concave part 26x that is a concave shape facing the back surface side and forms the front side convex part 26 together with the second concave part 26y described later is recessed.

[0100] The first recess 26x has a shape corresponding to the lower half of the front convex portion 26 in order to form the lower half of the front convex portion 26. That is, the bottom surface of the first recess 26x forms the lower inclined surface 26b of the front convex portion 26, and includes a lower inclined surface forming portion 26bx that inclines toward the back side as it goes upward from the lower end portion of the first recess 26x to increase the front-back direction depth of the first recess 26x, and a lower half portion forming portion 26cxa of the parallel surface 26c of the front convex portion 26 that forms the lower half portion of the parallel surface parallel to the vertical direction and the width direction. The upper end edge 28x of the lower half portion forming portion 26cxa of the parallel surface is a tapered surface that faces the second tape 31b side (the side of the tape placement recess 31bx for placing the second tape 31b) as it goes upward, and this tapered surface serves as a butting surface with the tapered surface of the lower end edge 28y of the upper half portion forming portion 26cxb of the parallel surface described later.

[0101] The second slide 8 includes a second base portion 81 that is on the upper surface side of the box body 21a and forms the tape groove 61 side rather than the vertically extending wall 53, a groove side partial convex portion 25z that forms the side of the tape groove 61 among the left and right of the butterfly bar hole convex portion 25x, a tape groove convex portion 61x, and a second side surface forming portion 83 that forms the side surface of the groove wall 57 among the side surfaces of the box body 21a. The second slide main body portion 82 is formed by the groove side partial convex portion 25z and the tape groove convex portion 61x. And in order from the box bar recess 21bx side toward the opposite side (runner 93 side) in the left-right direction, the groove side partial convex portion 25z, the tape groove convex portion 61x, and the second side surface forming portion 83 protrude downward from the lower surface of the second base portion 81. The lower end surfaces of the groove side partial convex portion 25z, the tape groove convex portion 61x, and the second side surface forming portion 83 are flush in a straight line in the left-right direction.

[0102] The groove side partial convex portion 25z has a second base portion 25za that extends downward from the lower surface of the second base portion 81, and a second tip portion 25zb that is connected to the second base portion 25za and extends downward.

[0103] The second base portion 25za is in the shape of a bar with a rectangular cross-section. The second tip portion 25zb is in the shape of a bar with a rectangular cross-section and extends downward from the portion on the first tape 31a side (runner 93 side) of the lower end portion of the second base portion 25za, rather than the entire lower end portion of the second base portion 25za. Therefore, the thickness of the second tip portion 25zb in the front-back direction is equal to the thickness of the second base portion 25za in the front-back direction, but the width of the second tip portion 25zb in the left-right direction is smaller than the width of the second base portion 25za in the left-right direction. Therefore, the groove-side portion convex portion 25z has a stepped bar shape formed by the second base portion 25za with a large width in the left-right direction and the second tip portion 25zb with a small width in the left-right direction.

[0104] Furthermore, in the portion on the second tape 31b side (the tape placement concave portion 31bx side for placing the second tape 31b) of the lower end portion of the second base portion 25za, there is a concave shape facing the back surface side, and a second concave portion 26y that forms the front-side convex portion 26 together with the above-described first concave portion 26x is recessed.

[0105] The second concave portion 26y has a shape corresponding to the upper half portion of the front-side convex portion 26 in order to form the upper half portion of the front-side convex portion 26. That is, the bottom surface of the second concave portion 26y forms the upper inclined surface 26a of the front-side convex portion 26, and an upper inclined surface forming portion 26ax that inclines toward the back side as it goes downward from the upper end portion of the first concave portion 26x to increase the depth of the second concave portion 26y in the front-back direction, and forms the upper half portion of the parallel surface 26c of the front-side convex portion 26, and a parallel surface upper half portion forming portion 26cxb that is parallel in the vertical direction and the width direction. The lower end edge 28y of the parallel surface upper half portion forming portion 26cxb is a tapered surface that faces the first tape 31a side (the side opposite to the tape placement concave portion 31bx for placing the second tape 31b) as it goes downward, and this tapered surface serves as a butting surface with the tapered surface of the upper end edge 28x of the above-described parallel surface lower half portion forming portion 26cxa.

[0106] As shown in FIG. 17, in the mold-closed state, the side surface on the second tape side 31b side (tape placement concave portion 31bx side) of the groove-side portion convex portion 25z and the side surface on the first tape 31a side (runner 93 side) of the anti-tape groove-side portion convex portion 25y are in surface contact, so that the groove-side portion convex portion 25z and the anti-tape groove-side portion convex portion 25y form a butterfly bar hole convex portion 25x for forming the butterfly bar hole 25.

[0107] Furthermore, in the states shown in FIGS. 17(a) to 17(b), the lower edge 28y of the upper half portion forming part 26cxb on the parallel plane and the tapered surface of the upper edge 28x of the lower half portion forming part 26cxa on the parallel plane are in surface contact, whereby the first recess 26x of the anti-tape groove side partial convex portion 25y and the second recess 26y of the groove side partial convex portion 25z are butted in the vertical direction, and a front side convex portion forming part 26z for forming the front side convex portion 26 is formed.

[0108] Since the front side convex portion forming part 26z composed of the first recess 26x and the second recess 26y has a shape corresponding to the front side convex portion 26, the inclination of the upper inclined surface forming part 26ax of the second recess 26y is larger than the inclination of the lower inclined surface forming part 26bx of the first recess 26x so as to correspond to the fact that the inclination of the upper inclined surface 26a of the front side convex portion 26 is larger than the inclination of the lower inclined surface 26b.

[0109] In FIGS. 15 to 17(b), only the front sides of the first slide 7 and the second slide 8 are shown, so only the first recess 26x and the second recess 26y of the front side convex portion forming part 26z for forming the front side convex portion 26 have been described. However, the first slide 7 and the second slide 8 have a front-back symmetric shape, and on the back sides of the first slide 7 and the second slide 8, a back side convex portion forming part for forming a back side convex portion 27 is provided. The back side convex portion forming part is composed of a recess (not shown) provided symmetrically with the first recess 26x on the back surface of the anti-tape groove side partial convex portion 25y and a recess (not shown) provided symmetrically with the second recess 26y on the back surface of the groove side partial convex portion 25z. When the mold is closed, these pair of recesses (not shown) are butted in the vertical direction, and a back side convex portion forming part for forming the back side convex portion 27 is formed. Since the above description of the front side convex portion forming part 26z is applicable to the detailed structure of the back side convex portion forming part, it is omitted.

[0110] Further, due to the groove-side partial convex portion 25z, the tape groove convex portion 61x, and the second side surface forming portion 83, space portions corresponding to the shape of the groove wall 57 are respectively formed on the front and back of the tape groove convex portion 61x. Therefore, the tape groove convex portion 61x is formed stepwise in the front-back direction with respect to the groove-side partial convex portion 25z and the second side surface forming portion 83. In other words, the tape groove convex portion 61x is disposed at the intermediate portion of the total front-back height width of both the groove-side partial convex portion 25z and the second side surface forming portion 83.

[0111] Further, as shown in FIGS. 15 and 16(a) to (c), a gate 92 is formed on the mating surface with the first and second side surface forming portions 73 and 83. The gate 92 extends in the left-right direction, and the shapes of the inlet portion and the outlet portion of the molten resin in the gate 92 are formed in different shapes (in the illustrated example, the shape of the inlet portion is circular and the shape of the outlet portion is rectangular). Moreover, an inlet recess 92x of a depression corresponding to half of the shape of the inlet portion is formed in the first and second side surface forming portions 73 and 83 respectively for the inlet portion of the molten resin in the gate 92, and an outlet recess 92y of a depression is formed only in the first side surface forming portion 73 for the outlet portion of the molten resin in the gate 92, and the second side surface forming portion 83 is provided with a flat surface 92z (see FIGS. 16(a) to (c) and FIGS. 17(a) to (b)) that closes the outlet recess 92y.

[0112] In the state where the injection mold shown in FIGS. 17(a) to (b) is clamped, the movable mold 6 abuts against the fixed mold 5, and the first slide body portion 72 of the first slide 7 in the state of moving upward abuts against the fixed mold 5, and the second slide 8 in the state of moving downward abuts against the first slide 7. When the first and second slides 7 and 8 abut against each other, a joint wall space portion 56s corresponding to the shape of the joint wall 56 is formed by the first slide 7 (the slide hole convex portion 63x of the first slide body portion 72, the first base portion 71, and the first side surface forming portion 73) and the second slide 8 (the groove side portion convex portion 25z of the butterfly rod hole convex portion 25x and the lower end surface of the tape groove convex portion 61x in the second slide 8). The joint wall space portion 56s is a space portion corresponding to the shapes of the groove closing portion 56a and the hole closing portion 56b of the joint wall 56, and is a closed space portion corresponding to the shape of the portion that closes both the lower portion of the portion on the tape groove 61 side in the butterfly rod hole 25 and the lower portion of the tape groove 61 in the cavity 91.

[0113] An embodiment of a method for molding the box 21 using the above-described injection mold will be described.

[0114] (1) First, as shown in FIG. 18(a), the injection mold is in the mold open state. Then, as shown in FIG. 18(b), a step of placing the second tape 31b on the fixed mold 5 is performed. Specifically, one end portion in the left-right direction of the second tape 31b is placed on the positioning portion 31bz (see FIG. 15) of the tape placement recess 31bx of the fixed mold 5 for positioning. Thereby, one side in the width direction of the second tape 31b is disposed on the cavity 91 side, and the other side in the width direction is disposed on the side away from the cavity 91.

[0115] At this time, in this embodiment, as shown in FIGS. 15 and 16(a) to (c), the first slide 7 is disposed in a state of being retracted downward (return movement state) from the back side body wall recess 55x, and the second slide 8 is disposed in a state of being retracted upward (return movement state) from the back side body wall recess 55x.

[0116] (2) Next, as shown in FIG. 18(c), the mold clamping process is performed. Specifically, the movable mold 6 is moved forward and backward in the front-back direction with respect to the fixed mold 5, and the two molds 5 and 6 are butted against each other. Along with this forward movement, the first and second slides 7 and 8 are moved forward and backward in the vertical direction (the first slide 7 is moved upward, and the second slide 8 is moved downward) from the states shown in FIGS. 15 and 16(a) to (c) to the states shown in FIGS. 17(a) and (b), so that the lower end surface of the vertical extension wall recess 53x of the box bar recess 21bx of the fixed mold 5 is butted against the upper end surface of the box bar recess 21bx of the first slide 7, and the lower end surface of the second side surface forming portion 83 of the second slide 8 is butted against the upper end surface of the first side surface forming portion 73 of the first slide 7. Thereby, the cavity 91, the gate 92, and the runner 93 are formed, and they are made to communicate with each other so that the molten resin can pass through them. At this time, the anti-tape groove side partial convex portion 25y on the first slide 7 and the groove side partial convex portion 25z on the second slide 8 are in surface contact with each other left and right, and the butterfly bar hole convex portion 25x is formed. Also, as described above with reference to FIGS. 17(a) and (b), when the lower end edge 28y of the upper half portion forming portion 26cxb of the parallel plane and the tapered surface of the upper end edge 28x of the lower half portion forming portion 26cxa of the parallel plane are in surface contact with each other, the first recess 26x of the anti-tape groove side partial convex portion 25y and the second recess 26y of the groove side partial convex portion 25z are butted against each other in the vertical direction, and a front side convex portion forming portion 26z for forming the front side convex portion 26 is formed. Similarly, although not shown, a back side convex portion forming portion for forming the back side convex portion 27 is formed.

[0117] Note that the forward movement of the first and second slides 7 and 8 is performed, for example, by utilizing the structure of an angular pin that protrudes from one of the fixed mold 5 and the movable mold 6 toward the other mold and a guide hole that guides the angular pin and is formed in the other mold, or by driving a dedicated motor. When reciprocating the first and second slides 7 and 8 with a dedicated motor, it is not necessarily required to drive the dedicated motor at the same time as the mold clamping process, and it may be before or after the mold clamping process.

[0118] (3) Next, as shown in FIG. 18(c), an injection process of injecting molten resin is performed. The molten resin is injected into the cavity 91 through the runner 93 and the gate 92. Then, the molten resin enters the joining wall space portion 56s (closed space portion) from the gate 92 and immediately collides with the first slide 7 (more specifically, the slide hole convex portion 63x of the first slide main body portion 72). It is assumed that the collided molten resin has its path forcibly changed and proceeds to form the front side body wall 54 and the back side body wall 55. Then, as shown in FIG. 18(d), the cavity 91 is filled with the molten resin. In the illustrated example, the collision surface of the slide hole convex portion 63x is a surface orthogonal to the left-right direction.

[0119] (4) When a predetermined time elapses after injection, since the resin is cooled to such an extent that it can sufficiently maintain its shape, next, as shown in FIG. 18(e), a mold opening process is performed. Specifically, the movable mold 6 is restored. Also, when using an angular pin, the first and second slides 7 and 8 are restored simultaneously with the restoration of the movable mold 6, or when not using an angular pin, a dedicated motor is driven to move the first and second slides 7 and 8 simultaneously with, above, or below the restoration of the movable mold 6.

[0120] (5) Thereafter, as shown in FIGS. 18(f) and 18(g), the runner resin portion 93r filled in the runner 93 and the gate resin portion 92r filled in the gate 92 are separated from the box 21 that becomes the product, and the box 21 that becomes the product is released from the fixed mold 5 with a push pin and recovered.

[0121] The box 21 manufactured by such a method, as described above, has a relatively steep inclination of the upper inclined surfaces 26a and 27a that come into contact when the butterfly bar 11 is inserted into the butterfly bar hole 25, and a relatively gentle inclination of the lower inclined surfaces 26b and 27b that come into contact when the butterfly bar 11 is pulled out from the butterfly bar hole 25. Thus, the force Fin required to insert the butterfly bar 11 into the butterfly bar hole 25 becomes larger than the force Fout required to pull out the butterfly bar 11 from the butterfly bar hole 25. Hereinafter, the measuring method of the forces Fin and Fout will be described.

[0122] [Method for Measuring the Force Fin Required to Insert the Butterfly Rod into the Butterfly Rod Hole] The measurement of the force Fin required to insert the butterfly rod 11 into the butterfly rod hole 25, that is, the force Fin required for the butterfly rod 11 to overcome the convex portions 26 and 27 and engage therewith, was performed by the following method.

[0123] The combination of the slide fasteners 100 of the first and second embodiments was released to bring the pair of first and second fastener strings 30A and 30B into a state. Then, the butterfly rod 11 was inserted into the butterfly rod hole 25 of the box 21, and the insertion strength (insertion resistance) at that time was measured. The measurement of the insertion strength was performed using a tensile testing machine manufactured by INSTRON. The first tape 31a provided with the butterfly rod 11 and the second tape 31b provided with the box 21 were respectively clamped, and the strength (insertion resistance) when at least one of the first tape 31a and the second tape 31b was pulled so that the butterfly rod 11 was inserted into the butterfly rod hole 25 of the box 21 was measured. At this time, the slider 40 was arranged in the lowermost position where it abutted against the box body 21a in advance so that the butterfly rod 11 could be inserted into the butterfly rod hole 25 via the slider 40 when at least one of the first tape 31a and the second tape 31b was pulled.

[0124] FIG. 19 is a graph showing an example of the relationship between the insertion distance (horizontal axis) of the butterfly rod 11 into the butterfly rod hole 25 and the insertion resistance (vertical axis). Although there may be a plurality of peaks in the insertion resistance, the first peak that occurs first after the start of insertion is adopted as the peak value of the insertion resistance. This is because this first peak indicates the peak that occurs when the butterfly rod 11 overcomes the convex portions 26 and 27.

[0125] After exceeding the first peak, the insertion resistance decreases because the butterfly rod 11 gets over the convex portions 26, 27, and the concave portions 16, 17 of the butterfly rod 11 engage with the convex portions 26, 27 of the butterfly rod hole 25. Note that after the first peak, a second peak may be obtained. However, this second peak is generated when the lower end of the butterfly rod 11 hits the hole closing portion 56b of the joining wall 56 or the like when the insertion is continued after the concave portions 16, 17 of the butterfly rod 11 engage with the convex portions 26, 27 of the butterfly rod hole 25. Therefore, this is not adopted as the peak value of the insertion resistance.

[0126] The peak value in the example shown in FIG. 19 was 4.14 N, which was within the preferable range of 4 to 6 N described above. If the peak value is within the range of 4 to 6 N, since it is an appropriate force to insert the butterfly rod 11 into the butterfly rod hole 25, the user can obtain a feeling of insertion or a click feeling as if it fits firmly due to the resistance feeling and sound when the butterfly rod 11 gets over the convex portions 26, 27, and can appropriately recognize that the butterfly rod 11 has been completely inserted into the box 21.

[0127] On the other hand, if the peak value exceeds 6 N, the insertion resistance is too large, and it is not preferable because the user needs to apply a large force to insert the butterfly rod 11 into the butterfly rod hole 25. Also, there is a possibility that the user may misrecognize that the butterfly rod 11 has reached the lowermost end of the butterfly rod hole 25 and the insertion is completed when hitting the convex portions 26, 27 before getting over the convex portions 26, 27 of the butterfly rod 11.

[0128] On the other hand, if the peak value is less than 4 N, the insertion resistance is too small, and the user cannot obtain an appropriate feeling of insertion or a click feeling.

[0129] [Method for Measuring the Force Fout Required to Pull out the Butterfly Rod from the Butterfly Rod Hole] The measurement of the force Fout required to pull out the butterfly rod 11 from the butterfly rod hole 25, that is, the force Fout required for the butterfly rod 11 to get over the convex portions 26, 27 and release the engagement, was performed by the following method.

[0130] From the state where a pair of first and second fastener stringers 30A and 30B are combined, the butterfly bar 11 was pulled out from the butterfly bar hole 25 of the box 21, and the pulling strength (pulling resistance) at that time was measured. The measurement of the pulling strength was performed using a tensile testing machine manufactured by INSTRON. The first tape 31a provided with the butterfly bar 11 and the handle 42 of the slider 40 were each clamped, and the strength (pulling resistance) was measured when at least one of the first tape 31a and the handle 42 of the slider 40 was pulled so that the butterfly bar 11 was pulled out from the butterfly bar hole 25 of the box 21. At this time, the slider 40 is arranged in the lowermost position where it abuts against the box body 21a in advance so that the butterfly bar 11 can be pulled out from the butterfly bar hole 25 through the slider 40 when at least one of the first tape 31a and the handle 42 of the slider 40 is pulled.

[0131] FIG. 20 is a graph showing an example of the relationship between the pulling distance (horizontal axis) of the butterfly bar 11 with respect to the butterfly bar hole 25 and the pulling resistance (vertical axis). The peak value of the pulling resistance of the graph is adopted as the force Fout required to pull out the butterfly bar 11 from the butterfly bar hole 25.

[0132] Note that the present invention is not limited to the above-described embodiments, and can be appropriately changed, improved, etc. within the practicable range.

[0133] As described above, the following matters are disclosed in this specification.

[0134] [1] A pair of first and second fastener stringers (30A, 30B), At least one slider (40) for opening and closing between the first and second fastener stringers (30A, 30B), A separating and inserting tool (1) provided at the longitudinal lower ends of the first and second fastener stringers (30A, 30B), A slide fastener (100) comprising: The separating and inserting tool (1) is: A first separating and inserting portion (10) provided on the first fastener stringer (30A), A second separation insertion part (20) provided on the second fastener stringer (30B) and capable of being connected to and disconnected from the first separation insertion part (10); comprising: The first separation insertion part (10) includes a butterfly rod (11) provided on the inner edge side in the width direction of the first fastener stringer (30A); The second separation insertion part (2) includes a box (21) provided on the inner edge side in the width direction of the second fastener stringer (30B); The box (21) is open upward and has a butterfly rod hole (25) through which the butterfly rod (11) can be inserted and removed in the longitudinal direction; At least one of the front surface (11b) and the back surface (11c) of the butterfly rod (11) is provided with recesses (16, 17); Among the inner surfaces (25a, 25b, 25c, 25d) constituting the butterfly rod hole (25) of the box (21), at least one of the front side surface (25a) and the back side surface (25b) facing the front surface (11b) and the back surface (11c) of the butterfly rod (11) is provided with protrusions (26, 27) that can engage with the recesses (16, 17); The protrusions (26, 27) have an asymmetric shape with respect to a plane (P) perpendicular to the insertion and removal direction of the butterfly rod (11) and passing through the central portion of the protrusions (26, 27) in the insertion and removal direction of the butterfly rod (11); The protrusions (26, 27) include upper inclined surfaces (26a, 27a) that increase the thickness of the protrusions (26, 27) as they go downward from the upper end portions of the protrusions (26, 27) in the insertion and removal direction of the butterfly rod (11), and lower inclined surfaces (26b, 27b) that increase the thickness of the protrusions (26, 27) as they go upward from the lower end portions of the protrusions (26, 27) in the insertion and removal direction of the butterfly rod (11); The inclination of the upper inclined surfaces (26a, 27a) is greater than the inclination of the lower inclined surfaces (26b, 27b); Slide fastener.

[0135] According to this configuration, since a relatively large force is required to completely insert the butterfly rod (11) into the butterfly rod hole (25), the user can obtain a sense of insertion and a click feeling from the resistance and sound when the butterfly rod (11) crosses the convex portions (26, 27), and can appropriately recognize that the butterfly rod (11) has been completely inserted into the box (21).

[0136] [2] The force (Fin) required to insert the butterfly rod (11) into the butterfly rod hole (25) is greater than the force (Fout) required to pull out the butterfly rod (11) from the butterfly rod hole (25). [1] The slide fastener according to [1].

[0137] According to this configuration, since a relatively large force is required to completely insert the butterfly rod (11) into the butterfly rod hole (25), the user can obtain a sense of insertion and a click feeling from the resistance and sound when the butterfly rod (11) crosses the convex portions (26, 27), and can appropriately recognize that the butterfly rod (11) has been completely inserted into the box (21).

[0138] [3] The force required to insert the butterfly rod (11) into the butterfly rod hole (25) is 4 to 6 N. [1] or [2] The slide fastener according to [1] or [2].

[0139] According to this configuration, since a relatively large force is required to completely insert the butterfly rod (11) into the butterfly rod hole (25), the user can obtain a sense of insertion and a click feeling from the resistance and sound when the butterfly rod (11) crosses the convex portions (26, 27), and can appropriately recognize that the butterfly rod (11) has been completely inserted into the box (21).

[0140] [4] The concave portions (16, 17) are respectively provided on the front surface (11b) and the back surface (11c) of the butterfly rod (11). The convex portions (26, 27) are respectively provided on the front side surface (25a) and the back side surface (25b) of the butterfly rod hole (25) of the box (21). [1] to [3] Any one of [1] to [3] The slide fastener according to [1] to [3].

[0141] According to this configuration, the force Fin required to engage the convex portions (26, 27) with the concave portions (16, 17) increases, and the user can more reliably obtain a feeling of insertion and a clicking feeling, and it becomes possible to more appropriately recognize that the butterfly bar (11) has been completely inserted into the box (21).

[0142] [5] The convex portions (26, 27) connect the upper inclined surfaces (26a, 27a) and the lower inclined surfaces (26b, 27b), and include parallel surfaces (26c, 27c) parallel to the insertion / extraction direction and the width direction. [1] to [4] The slide fastener according to any one of.

[0143] According to this configuration, the convex portions (26, 27) connect the upper inclined surfaces (26a, 27a) and the lower inclined surfaces 26b, 27b, and have parallel surfaces 26c, 27c parallel to the insertion / extraction direction (vertical direction) and the width direction (horizontal direction) of the butterfly bar (11). Therefore, the convex portions (26, 27) and the concave portions (16, 17) can be engaged with less play.

[0144] [6] The concave portions (16, 17) penetrate the butterfly bar (11) in the width direction. [1] to [5] The slide fastener according to any one of.

[0145] According to this configuration, even if dust such as human dirt or clothing fibers enters the concave portions (16, 17) by any chance, it can be easily discharged from the concave portions (16, 17) in the width direction.

[0146] [7] The length (M1) of the concave portions (16, 17) in the width direction is larger than the length (M2) of the convex portions (26, 27) in the width direction. [1] to [6] The slide fastener according to any one of.

[0147] According to this configuration, the convex portions (26, 27) can easily fit into the concave portions (16, 17). For example, the butterfly bar (11) may be inserted while being inclined in the width direction (left - right direction) with respect to the butterfly bar hole 25. Even in this case, the concave portions (16, 17) of the butterfly bar are surely engaged with the convex portions (26, 27) of the butterfly bar hole 25. Further, even when the convex portions (26, 27) come into contact with the concave portions (16, 17) after the engagement, since the convex portions (26, 27) are elastically deformed in the width direction within the concave portions (16, 17), it is possible to prevent the generation of local stress in the convex portions (26, 27).

[0148] [8] When the concave portions (16, 17) and the convex portions (26, 27) are engaged, the gap in the width direction between the concave portions (16, 17) and the convex portions (26, 27) is larger than the gap in the insertion - extraction direction between the concave portions (16, 17) and the convex portions (26, 27). [1] - [7] The slide fastener according to any one of [1] - [7].

[0149] According to this configuration, a feeling of insertion when the concave portions (16, 17) and the convex portions (26, 27) are engaged can be obtained, and the convex portions (26, 27) can easily fit into the concave portions (16, 17).

[0150] [9] A pair of first and second fastener stringers (30A, 30B), at least one slider (40) for opening and closing between the first and second fastener stringers (30A, 30B), a separation - insertion fitting (1) provided at the longitudinal lower ends of the first and second fastener stringers (30A, 30B), A slide fastener (100) comprising: The separation - insertion fitting (1) includes: a first separation - insertion portion (10) provided on the first fastener stringer (30A), a second separation - insertion portion (20) provided on the second fastener stringer (30B) and capable of being connected to and disconnected from the first separation - insertion portion (10), and comprising: The first opening and inserting portion (10) includes a butterfly rod (11) provided on the inner edge side in the width direction of the first fastener stringer (30A). The second opening and inserting portion (2) includes a box (21) provided on the inner edge side in the width direction of the second fastener stringer (30B). The box (21) is open upward and has a butterfly rod hole (25) into which the butterfly rod (11) can be inserted and removed in the longitudinal direction. At least one of the front surface (11b) and the back surface (11c) of the butterfly rod (11) is provided with recesses (16, 17). Among the inner surfaces (25a, 25b, 25c, 25d) constituting the butterfly rod hole (25) of the box (21), at least one of the front side surface (25a) and the back side surface (25b) facing the front surface (11b) and the back surface (11c) of the butterfly rod (11) is provided with protrusions (26, 27) that can engage with the recesses (16, 17). The force (Fin) required to insert the butterfly rod into the butterfly rod hole (25) of the box is greater than the force (Fout) required to pull the butterfly rod out of the butterfly rod hole (25) of the box. Slide fastener.

[0151] According to this configuration, since a relatively large force is required to completely insert the butterfly rod (11) into the butterfly rod hole 25, the user can obtain a feeling of insertion and a clicking feeling due to the resistance and sound when the butterfly rod (11) overrides the protrusions (26, 27), and can appropriately recognize that the butterfly rod (11) has been completely inserted into the box (21).

[0152]

[10] A method for manufacturing a box (21) of a separation and insertion tool (1) for a slide fastener, Protrusions (26, 27) are provided on the inner surfaces (25a, 25b) of the butterfly rod hole (25) into which the butterfly rod (11) can be inserted and removed in the box (21). The box (21) is obtained by injection molding using a fixed mold (5), a movable mold (6) provided so as to be reciprocally movable in the front-rear direction with respect to the fixed mold (5), and first and second slides (7, 8) provided so as to be reciprocally movable in the vertical direction with respect to the fixed mold (5). The first concave portion (26x) recessed in the first slide (7) and the second concave portion (26y) recessed in the second slide (8) are abutted against each other to form a convex portion forming portion (26z) for forming the convex portions (26, 27). A method for manufacturing a case of a separating and inserting tool for a slide fastener.

[0153] According to this configuration, convex portions (26, 27) can be provided on the inner surfaces (25a, 25b) of the butterfly bar holes (25) of the case (21) by injection molding.

Explanation of reference numerals

[0154] 1 Separating and inserting tool 5 Fixed mold 6 Movable mold 7 First slide 7y First reciprocating concave portion 8 Second slide 8y Second reciprocating concave portion 10 First separating and inserting portion 11 Butterfly bar 11a Projection 11b Surface 11c Back surface 11d Bottom surface 11e Locking groove portion 12 First reinforcing strip portion 13 First connecting portion 13a Surface 13b Back surface 14 Step 15 Thin-wall guide portion 16 Front-side concave portion (concave portion) 16a Left-side opening 16b Right-side opening 16c Parallel surface 16d Upper inclined surface 16e Lower inclined surface 17 Back-side concave portion (concave portion) 17a Left-side opening 17b Right-side opening 17c Parallel surface 17d Upper inclined surface 17e Lower inclined surface 18a Upper surface of the surface Lower part of the 18b surface 18c parallel plane 18d First inclined plane 18e Second inclined plane Upper part of the 19a inner surface Lower part of the 19b inner surface 19c parallel plane Inclined plane Second separation and insertion part Box 21a Box body 21ax Concave part of the box body 21b Box bar 21bx Concave part of the box bar 21by Semi-concave part of the box bar 21bz Wall 21c Notch Locking part Second reinforcing bar part Second connecting part Thin guide part Butterfly bar hole Front side surface (inner surface) Back side surface (inner surface) Right side surface (inner surface) Left side surface (inner surface) Butterfly bar hole convex part Anti-tape groove side part convex part 25ya First base part 25yb First tip part Groove side part convex part Front side convex part (convex part) Upper inclined plane 26ax Upper inclined plane forming part Lower inclined plane 26bx Lower inclined plane forming part Parallel plane 26cxa Parallel plane lower half forming part 26cxb Parallel plane upper half forming part 26x First concave part 26y Second concave part 26z Front side convex part forming part (convex part forming part) Back side convex part (convex part) Upper inclined plane Lower inclined plane 27c parallel plane 28x upper edge 28y lower edge 30A First fastener stringer 30B Second fastener stringer 31a First tape 31b Second tape 31bx Tape placement recess 31by Tape placement semi-recess 31bz Positioning part 31c Tape reinforcement part 32 Element 33 Upper stopper 40 Slider 41 Slider body 42 Pull handle 43 Upper wing plate 43a Raised part 44 Lower wing plate 44a Raised part 46 Pull handle holding part 53 Upper and lower extension wall 53x Upper and lower extension wall recess 53y Upper and lower extension wall semi-recess 54 Front side barrel wall 54x Front side barrel wall recess 55 Back side barrel wall 55x Back side barrel wall recess 56 Joining wall 56a Groove closing part 56b Hole closing part 56s Space part for joining wall 56x Joining wall recess 57 Groove wall 57x Groove wall recess 61 Tape groove 61x Tape groove protrusion 63 Slide hole 63x Slide hole protrusion 71 First base part 72 First slide body part 73 First side forming part 81 Second base part 82 Second slide body part 83 Second side forming part 91 Cavity 92 Gate 92r Gate resin part 92x Inlet recess 92y Outlet recess 92z Plane 93 Runner 93r Runner resin part 93y Runner semi-recess 100 Slide fastener

Claims

1. A pair of first and second fastener stringers (30A, 30B), At least one slider (40) for opening and closing between the first and second fastener stringers (30A, 30B), A separating and inserting tool (1) provided at the longitudinal lower ends of the first and second fastener stringers (30A, 30B), A slide fastener (100) comprising: The separating and inserting tool (1) includes: A first separating and inserting portion (10) provided on the first fastener stringer (30A), A second separating and inserting portion (20) provided on the second fastener stringer (30B) and capable of connecting and disconnecting from the first separating and inserting portion (10), And comprises: The first separating and inserting portion (10) includes a butterfly bar (11) provided on the inner edge side in the width direction of the first fastener stringer (30A), The second separating and inserting portion (20) includes a box (21) provided on the inner edge side in the width direction of the second fastener stringer (30B), The box (21) is open upward and has a butterfly bar hole (25) through which the butterfly bar (11) can be inserted and removed in the longitudinal direction, At least one of the front surface (11b) and the back surface (11c) of the butterfly bar (11) is provided with recesses (16, 17), Among the inner surfaces (25a, 25b, 25c, 25d) constituting the butterfly bar hole (25) of the box (21), at least one of the front side surface (25a) and the back side surface (25b) facing the front surface (11b) and the back surface (11c) of the butterfly bar (11) is provided with protrusions (26, 27) engageable with the recesses (16, 17), With respect to a plane (P) perpendicular to the insertion and removal direction of the butterfly bar (11) passing through the central portion of the protrusions (26, 27) in the insertion and removal direction of the butterfly bar (11), the protrusions (26, 27) have an asymmetric shape, The protrusions (26, 27) include upper inclined surfaces (26a, 27a) that increase the thickness of the protrusions (26, 27) as they go downward from the upper ends of the protrusions (26, 27) in the insertion and removal direction of the butterfly bar (11), and lower inclined surfaces (26b, 27b) that increase the thickness of the protrusions (26, 27) as they go upward from the lower ends of the protrusions (26, 27) in the insertion and removal direction of the butterfly bar (11), The inclination of the upper inclined surfaces (26a, 27a) is greater than the inclination of the lower inclined surfaces (26b, 27b), A slide fastener.

2. The force (Fin) required to insert the butterfly bar (11) into the butterfly bar hole (25) is greater than the force (Fout) required to pull out the butterfly bar (11) from the butterfly bar hole (25). The slide fastener according to claim 1.

3. The force required to insert the butterfly bar (11) into the butterfly bar hole (25) is 4 to 6 N. The slide fastener according to claim 1 or 2.

4. The recesses (16, 17) are respectively provided on the front surface (11b) and the back surface (11c) of the butterfly bar (11). The protrusions (26, 27) are respectively provided on the front side surface (25a) and the back side surface (25b) of the butterfly bar hole (25) of the box (21). The slide fastener according to claim 1 or 2.

5. The protrusions (26, 27) connect the upper inclined surfaces (26a, 27a) and the lower inclined surfaces (26b, 27b), and include parallel surfaces (26c, 27c) parallel to the insertion / extraction direction and the width direction. The slide fastener according to claim 1 or 2.

6. The recesses (16, 17) penetrate the butterfly bar (11) in the width direction. The slide fastener according to claim 1 or 2.

7. The length (M1) of the recesses (16, 17) in the width direction is greater than the length (M2) of the protrusions (26, 27) in the width direction. The slide fastener according to claim 1 or 2.

8. When the recesses (16, 17) and the protrusions (26, 27) are engaged, the gap in the width direction between the recesses (16, 17) and the protrusions (26, 27) is greater than the gap in the insertion / extraction direction between the recesses (16, 17) and the protrusions (26, 27). The slide fastener according to claim 1 or 2.

9. A pair of first and second fastener stringers (30A, 30B); At least one slider (40) for opening and closing between the first and second fastener stringers (30A, 30B); A separation and insertion fitting (1) provided at the longitudinal lower ends of the first and second fastener stringers (30A, 30B); A slide fastener (100) comprising: The separation and insertion fitting (1) is: A first separation and insertion portion (10) provided on the first fastener stringer (30A); A second separation and insertion portion (20) provided on the second fastener stringer (30B) and capable of being connected to and disconnected from the first separation and insertion portion (10); Comprising. The first opening and disengaging insertion portion (10) includes a butterfly rod (11) provided on the inner edge side in the width direction of the first fastener stringer (30A). The second opening and disengaging insertion portion (2) includes a box (21) provided on the inner edge side in the width direction of the second fastener stringer (30B). The box (21) is open upward and has a butterfly rod hole (25) into which the butterfly rod (11) can be inserted and removed in the longitudinal direction. At least one of the front surface (11b) and the back surface (11c) of the butterfly rod (11) is provided with recesses (16, 17). Among the inner surfaces (25a, 25b, 25c, 25d) constituting the butterfly rod hole (25) of the box (21), at least one of the front side surface (25a) and the back side surface (25b) facing the front surface (11b) and the back surface (11c) of the butterfly rod (11) is provided with protrusions (26, 27) that can engage with the recesses (16, 17). The force (Fin) required to insert the butterfly rod into the butterfly rod hole (25) of the box is greater than the force (Fout) required to remove the butterfly rod from the butterfly rod hole (25) of the box. Slide fastener.

10. A method for manufacturing a box (21) of a slide fastener opening and disengaging insert (1), Protrusions (26, 27) are provided on the inner surfaces (25a, 25b) of the butterfly rod hole (25) into which the butterfly rod (11) can be inserted and removed in the box (21). The box (21) is obtained by injection molding using a fixed mold (5), a movable mold (6) provided to be reciprocally movable in the front and back directions with respect to the fixed mold (5), and first and second slides (7, 8) provided to be reciprocally movable in the vertical direction with respect to the fixed mold (5). A convex portion forming portion (26z) for forming the convex portions (26, 27) is formed by abutting a first recess (26x) recessed in the first slide (7) and a second recess (26y) recessed in the second slide (8). A method for manufacturing a box of a slide fastener opening and disengaging insert.

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