Slide fastener and method for producing separable bottom stop box for slide fastener

Abstract

Among inner surfaces (25a, 25b, 25c, 25d) constituting a butterfly rod hole (25) of a box (21), at least one of a front-side surface (25a) and a back-side surface (25b) facing the front surface (11b) and the rear surface (11c) of a butterfly rod (11) is provided with protrusions (26, 27) capable of engaging with recesses (16, 17). When the side on which a first fastener stringer (30A) is disposed is defined as a first side (L) and the side on which a second fastener stringer (30B) is disposed is defined as a second side (R) in the left-right direction, the protrusions (26, 27) slant toward the first side (L) in the left-right direction as proximity to the lower side (DN) increases, and among the inner surfaces (25a, 25b, 25c, 25d) constituting the butterfly rod hole (25) of the box (21), a slanted surface (29) that slants downward toward the first side (L) in the left-right direction is provided on the side surface (25c) of the second side (R) in the left-right direction.

Description

Method for manufacturing a box for a slide fastener and a separable bottom end stop for the slide fastener

[0001] The present invention relates to a slide fastener and a method of manufacturing a box for a separable bottom end stop for a slide fastener.

[0002] A separable bottom end stop for a slide fastener is generally provided at the lower end of left and right fastener stringers and includes one of the left and right insert pins and the other of the left and right boxes. The fastener stringer has an element row attached to the inner edge of the fastener tape. When the slider between the left and right fastener stringers is lowered to its lowest position where it abuts against the separable bottom end stop, the left and right fastener stringers can be separated by removing the insert pin from the box and lifting it up through the element guide path of the slider. From this separated state, the insert pin of one fastener stringer is passed through the element guide path of the slider, which is at the lowest position where it abuts against the box, and then inserted into the box, thereby aligning the lower end portions of the left and right fastener stringers. From this aligned state, the slider is moved upward to close the gap between the fastener elements of the left and right fastener stringers.

[0003] If the slider is moved upward when the insert pin is not fully inserted into the box, i.e., when the bottom ends of the left and right fastener stringers are not aligned, an incorrect combination of the left and right fastener stringers may occur. To prevent this from happening, it is desirable for the user to be able to recognize when the bottom ends of the pair of left and right fastener stringers are aligned.

[0004] For example, Patent Document 1 discloses a separable bottom end stop for a slide fastener in which an insert pin is removably fitted into a box body substantially parallel to the box pin. In this separable bottom end stop for a slide fastener, a recess is provided at the tip of one or both of the front and back surfaces of the insert pin, and a protrusion that protrudes into the recess is provided on the inner surface of an engagement hole in the box body into which the insert pin fits. Therefore, when the insert pin is fully inserted into the box, the recess of the insert pin engages and is held by the protrusion of the box body, and there is resistance when removing the insert pin from the box body, so that when the user attempts to pull the insert pin out of the box body, he or she can recognize that the lower ends of the pair of left and right fastener stringers are aligned.

[0005] Japanese Publication No. 7-3925

[0006] The slide fastener of Patent Document 1 has as its main purpose the ability to easily insert the insert pin into the box even with one hand, and by forming a tapered surface on the convex and an inclined cam surface on the insert pin, it is possible to insert the insert pin smoothly into the engagement hole with little resistance when the insert pin hits the convex, Therefore, when inserting the insert pin into the box, there is little resistance or noise, and it may be difficult for the user to recognize the insertion feeling.

[0007] Furthermore, as described above, the gap between the fastener elements of the left and right fastener stringers can be closed by moving the slider upward when the insert pin is fully inserted into the box, but if the slider is moved upward when the insert pin is not fully inserted into the box, an incorrect combination may occur. In order to prevent such an incorrect combination, the inventors have conceived the idea that it would be preferable from the perspective of improving the starting performance of the slider if the slider were automatically pulled up when the insert pin is fully inserted into the box, so that the first element on the box and the insert pin begin to mesh.

[0008] The present invention has been made in view of the above-mentioned problems, and its object is to provide a method for manufacturing a box for a slide fastener and a separable bottom end stop for a slide fastener, which allows the user to properly recognize that the insert pin has been inserted into the box and has excellent slider starting properties.

[0009] The present invention achieves the above object by the following configuration: [1] A slide fastener (100) comprising a pair of left and right first and second fastener stringers (30A, 30B), at least one slider (40) for opening and closing the first and second fastener stringers (30A, 30B), and a separable bottom end stop (1) provided at the lower end in the longitudinal direction of the first and second fastener stringers (30A, 30B), wherein the separable bottom end stop (1) comprises a first separable insert portion (10) provided on the first fastener stringer (30A), and a second separable insert portion (20) provided on the second fastener stringer (30B) and capable of connecting to and disconnecting from the first separable insert portion (10), and the first separable insert portion (10) includes an insert pin (11) provided on the inner edge side in the width direction of the first fastener stringer (30A), The second separable inserting portion (20) includes a box (21) provided on the widthwise inner edge side of the second fastener stringer (30B), the box (21) has an insert pin hole (25) that opens upward (UP) and allows the insert pin (11) to be inserted and removed in the longitudinal direction, at least one of the front surface (11b) and the back surface (11c) of the insert pin (11) is provided with recesses (16, 17), and among the inner surfaces (25a, 25b, 25c, 25d) that constitute the insert pin hole (25) of the box (21), at least one of the front side surface (25a) and the back side surface (25b) that face the front surface (11b) and the back surface (11c) of the insert pin (11) is provided with protrusions (26, 27) that can engage with the recesses (16, 17), a slide fastener characterized in that, when the side on which the first fastener stringer (30A) is arranged is defined as a first side (L) in the left-right direction and the side on which the second fastener stringer (30B) is arranged is defined as a second side (R), the convex portions (26, 27) are inclined toward the first side (L) in the left-right direction as they extend downward (DN), and a sloping surface (29) is provided on a side surface (25c) on the second side (R) in the left-right direction of the inner surfaces (25a, 25b, 25c, 25d) constituting the insert pin hole (25) of the box (21) that is inclined downward toward the first side (L) in the left-right direction.[2] A method for manufacturing a box (21) of a separable bottom end stop (1) for a slide fastener, wherein the box (21) is provided with convex portions (26, 27) on at least one of the front side surface (25a) and the back side surface (25b) of the inner surface (25a, 25b) of an insert pin hole (25) through which an insert pin (11) can be inserted and removed, and when the side on which the insert pin (11) is arranged in the left-right direction is defined as a first side (L) and the side on which the box (21) is arranged is defined as a second side (R), the convex portions (26, 27) are inclined downward toward the first side (L) in the left-right direction, and an inclined surface (29) is provided on the side surface (25c) on the second side in the left-right direction of the inner surfaces (25a, 25b, 25c, 25d) constituting the insert pin hole (25) of the box (21) that is inclined downward toward the first side (L) in the left-right direction, The box (21) is obtained by injection molding using a fixed mold (5), a movable mold provided so as to be reciprocable in the front-to-back direction relative to the fixed mold (5), and first and second slides (7, 8) provided so as to be reciprocable in the up-down direction relative to the fixed mold (5), wherein a first recess (26x) provided in the first slide (7) and a second recess (26y) provided in the second slide (8) are butted together to form a convex portion forming portion (26z) for forming the convex portions (26, 27), the first slide (7) has an inclined surface forming portion (29x) for forming the inclined surface (29), the first slide (7) is reciprocable in a direction inclined with respect to the up-down direction at an inclination angle (α3) that is the same as the inclination angle (α1) of the inclined surface (29), and the second slide (8) is reciprocable in a direction parallel to the up-down direction. A method for manufacturing a box for a separable bottom end stop for a slide fastener.

[0010] According to the present invention, a method for manufacturing a box for a slide fastener and a separable bottom end stop for a slide fastener allows a user to properly recognize that an insert pin has been inserted into the box and has excellent slider starting properties.

[0011] FIG. 1 is a front view of a slide fastener according to a first embodiment of the present invention. FIG. 2 is an enlarged front view showing a decoupled state of the first and second separable insert portions. FIG. 3 is a side view showing the slider indicated by a dashed line. FIG. 4 is a perspective view of the first separable insert portion and the second separable insert portion. FIG. 5A is a front view of the first separable insert portion as seen from the front side. FIG. 5B is a rear view of the first separable insert portion as seen from the back side. FIG. 5C is a right side view of the first separable insert portion as seen from the right side in the width direction. FIG. 6A is a front view of the second separable insert portion as seen from the front side. FIG. 6B is a rear view of the second separable insert portion as seen from the back side. FIG. 6C is a left side view of the second separable insert portion as seen from the left side in the width direction. FIG. 7 is a front view of the second separable insert portion as seen from the front side, showing a box as seen from the cross section arrow VII-VII of FIG. 6C. FIG. 8 is a rear view of the second separable inserting portion as seen from the back side, and shows the box as seen from the cross section VIII-VIII arrow of FIG. 6C. FIG. 9A is a view showing the insert pin in the middle of being inserted into the insert pin hole of the box, with the slider partially cut away. FIG. 9B is a view showing the same state as FIG. 9A, with the slider viewed from the front. FIG. 9C is a view showing the same state as FIG. 9A, with the box partially cut away. FIG. 10A is a view showing the state after the insert pin has been completely inserted into the insert pin hole of the box, with the slider partially cut away. FIG. 10B is a view showing the same state as FIG. 10A, with the slider viewed from the front. FIG. 10C is a view showing the same state as FIG. 10A, with the slider partially cut away. FIG. 11A is a diagram showing a state in which an insert pin has been inserted into an insert pin hole of a box in a comparative example in which an inclined surface is not provided on the insert pin hole, and shows the slider partially cut away. FIG. 11B is a diagram showing the same state as FIG. 11A in a comparative example in which an inclined surface is not provided on the insert pin hole, showing the slider as viewed from the surface. FIG. 12 is a surface view of a molding die used in a box manufacturing method, showing the first and second slides in an open state. FIG. 13 is a surface view of a molding die used in a box manufacturing method, showing the first and second slides in a closed state. FIG. 14 is a cross-sectional view taken along line XIV-XIV of FIG. 13. FIG. 15 is a front view of a first separable insert portion according to a modified example, seen from the surface side.FIG. 16 is a diagram showing a state in which the insert pin according to the modified example shown in FIG. 15 has been completely inserted into the insert pin hole of the box.

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a slide fastener and a box for a separable bottom end stop for a slide fastener according to each embodiment of the present invention will be described in detail with reference to the drawings.

[0013] In this specification, the "vertical direction" refers to the sliding direction of the slider, the longitudinal direction of the slide fastener or fastener stringer, and the direction in which the insert pin is inserted into or removed from the box. Of the "vertical direction," the direction in which the slider slides to interlock the left and right element rows is referred to as "upward," and the direction in which the slider slides to separate the left and right element rows is referred to as "downward." In the drawings, "upward" is indicated by UP, and "downward" is indicated by DN.

[0014] The "left-right direction" refers to the direction in which a pair of element rows are arranged, a direction perpendicular to the sliding direction of the slider, and can also be referred to as the width direction of the slide fastener, fastener stringer, element, insert pin, and box. In the drawings, "left" is indicated by L and "right" is indicated by R. In the left-right direction, the side on which the first fastener stringer 30A is arranged is sometimes called the first side (L), and the side on which the second fastener stringer 30B is arranged is sometimes called the second side (R).

[0015] Furthermore, the "front-rear direction" is a direction perpendicular to the up-down direction and the left-right direction, and can also be rephrased as the thickness direction of the slide fastener, fastener stringer, element, insert pin, and box. In the drawings, "front" is indicated by F and "back" is indicated by B.

[0016] [First embodiment] Fig. 1 is a front view of a slide fastener 100 according to a first embodiment of the present invention. Fig. 2 is an enlarged front view showing a state in which the first and second separable inserting portions are disconnected, with the first and second fastener stringers separated. Fig. 3 is a side view showing the slider indicated by a dashed line.

[0017] 1 and 2, a slide fastener 100 includes a pair of left and right first and second fastener stringers (hereinafter, fastener stringers will also be simply referred to as "stringers") 30A, 30B, a slider 40 that a user moves up and down to open and close the space between the first and second stringers 30A, 30B, and a separable bottom end stop for a slide fastener (hereinafter, referred to as "separable bottom end stop") 1 according to one embodiment of the present invention, which is formed at the lower end of the first and second stringers 30A, 30B in the longitudinal direction (vertical direction). In this example, there is one slider 40 between the first and second stringers 30A, 30B, but there may be two or more.

[0018] Each of the first and second stringers 30A, 30B includes a strip-shaped fastener tape (hereinafter also simply referred to as "tape") 31a, 31b that is long in the vertical direction, a fastener element (hereinafter also simply referred to as "element") 32 attached along the inner edge, which is the edge on the opening and closing side in the width direction of each tape 31a, 31b, and an upper stop 33 that limits the upward movement of the slider 40.

[0019] 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 made of woven or knitted polyamide fiber, polyester fiber, acrylic fiber, or the like, and the element 32 is made of a synthetic resin such as polyester or nylon, but is not limited to these. The type of element 32 is also not limited, and it may be, for example, a coil element. The element 32 located at the bottom end of the second stringer 30B may be referred to as the "first element 32A." The first element 32A engages with the lower insert pin 11 and the upper element 32.

[0020] 3 , which shows a side view of the slider 40 with a dashed line, the slider 40 includes a slider body 41 and a pull tab 42 connected to the slider body 41. The slider body 41 includes a front blade 43 disposed on the front side of the first and second stringers 30A, 30B, and a rear blade 44 disposed on the rear side of the first and second stringers 30A, 30B. The front blade 43 and the rear blade 44 are connected by a guide post 45 above and at the center in the left-right direction between them, thereby defining a Y-shaped element guide path that branches upward between the front blade 43 and the rear blade 44.

[0021] 1 and 3 designates a pull tab holder to which the pull tab 42 is connected, and the pull tab holder 46 protrudes from the front blade 43. When the lower ends of the first and second stringers 30A, 30B shown in FIG. 1 are connected by a separable bottom end stop 1 (described later), if a user holds the pull tab 42 and moves the slider body 41 upward (UP), the left and right elements 32 pass through the element guide paths between the front and rear blades 43, 44 and engage with each other, closing the gap between the first and second stringers 30A, 30B. If the slider body 41 is moved downward (DN), the left and right elements 32 are disengaged from each other, opening the gap between the first and second stringers 30A, 30B.

[0022] The left and right lower side portions of the front blade 43 are provided with raised portions 43a (see FIG. 6) that protrude from the back side (B) to prevent the left and right elements 32 from slipping out of the element guide paths. The left and right lower side portions of the rear blade 44 are also provided with raised portions 44a that protrude slightly from the front side (F). The distance T1 between these raised portions 43a, 44a is the minimum distance between the front and rear blades 43, 44, and this minimum distance T1 is smaller than the maximum thickness of the element 32 in the front-to-back direction and larger than the thickness of the tape 31.

[0023] Although not shown, the separable bottom end stop 1 may be formed by injection molding or extrusion molding a thermoplastic resin such as polyacetal, polyamide, polypropylene, or polybutylene terephthalate onto tape reinforcement sections formed by reinforcing the lower ends of the left and right tapes 31a, 31b with a thermoplastic resin. Such tape reinforcement sections are formed by welding a thermoplastic resin film such as polyamide or polyethylene to the lower ends of the left and right tapes 31a, 31b using ultrasonic processing or the like, or by penetrating and solidifying a thermoplastic resin liquid. The tape reinforcement sections are preferably provided over the entire width of each tape 31a, 31b.

[0024] The separable bottom end stop 1 includes a first separable bottom end insert 10 provided at the lower end of the first stringer 30A and a second separable bottom end insert 20 provided at the lower end of the second stringer 30B. The first separable bottom end insert 10 and the second separable bottom end insert 20 can be connected and disconnected, and Fig. 1 shows the first and second separable bottom end inserts 10, 20 in a connected state, while Fig. 2 shows an enlarged view of the first and second separable bottom end inserts 10, 20 in a disconnected state.

[0025] Fig. 4 is a perspective view of the first separable insert 10 and the second separable insert 20. Fig. 5A is a front view of the first separable insert 10 as seen from the front side, Fig. 5B is a rear view of the first separable insert 10 as seen from the back side, and Fig. 5C is a right side view of the first separable insert 10 as seen from the right side in the width direction.

[0026] 1 to 2 and 4 to 5C, the first separable insert portion 10 is a vertically long insert pin 11 provided on the widthwise inner edge side of the lower end of the first stringer 30A. Although not shown, the first separable insert portion 10 may have a structure including the insert pin 11, a vertically long first reinforcing strip portion provided substantially parallel to and spaced to the left of the insert pin 11 in the widthwise direction, and a first connecting portion connecting the insert pin 11 and the first reinforcing strip portion in the widthwise direction.

[0027] In the front-to-back direction, the thickness of the insert pin 11 is slightly thicker than the thickness of the first tape 31a. Therefore, the front surface 11b and the back surface 11c of the insert pin 11 slightly protrude 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 insert pin 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.

[0028] The insert pin 11 has a protrusion 11a that protrudes to the right at the upper right end portion. The protrusion 11a is a so-called half tooth that meshes with the box pin 21b of the second fastener stringer 30B and the first element 32A.

[0029] 5C , a locking groove 11e that accommodates the locking portion 21d of the box pin 21b is formed as a recess below the protrusion 11a on the upper right side of the insert pin 11. The locking groove 11e is formed in the center of the right side of the insert pin 11 in the front-to-back direction.

[0030] The insert pin 11 is inserted into and removed from an insert pin hole 25 of a box 21 (described later) of the second separable insert portion 20, thereby connecting and disconnecting the first separable insert portion 10 and the second separable insert portion 20.

[0031] Recesses 16, 17 are provided at the bottom of the front surface 11b and the back surface 11c of the insert pin 11, respectively, and are recessed in a direction that reduces the thickness of the insert pin 11 in the front-to-back direction. The recesses 16, 17 are located slightly above the lower ends of the front surface 11b and the back surface 11c. Note that the recesses 16, 17 do not necessarily have to be provided on both the front surface 11b and the back surface 11c of the insert pin 11, but may be provided on at least one of the front surface 11b and the back surface 11c. Of the recesses 16, 17, the one provided on the front surface 11b is called the front-side recess 16, and the one provided on the back surface 11c is called the back-side recess 17.

[0032] The front-side recess 16 includes an upper inclined surface 16d that slopes downward from the upper end of the front-side recess 16 in the insertion / removal direction (vertical direction) of the insert pin 11, thereby increasing the thickness of the front-side recess 16; a lower inclined surface 16e that slopes upward from the lower end of the front-side recess 16 in the insertion / removal direction of the insert pin 11, thereby increasing 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 width direction (left / right direction) of the insert pin 11.

[0033] In addition, the back side recess 17 includes an upper inclined surface 17d that slopes toward the front as it moves downward from the upper end of the back side recess 17 in the insertion / removal direction (vertical direction) of the insert pin 11, thereby increasing the thickness of the back side recess 17, a lower inclined surface 17e that slopes toward the front as it moves upward from the lower end of the back side recess 17 in the insertion / removal direction of the insert pin 11, thereby increasing the thickness of the back side recess 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 width direction (left / right direction) of the insert pin 11.

[0034] The front recess 16 and the back recess 17 are formed over the entire widthwise length of the front surface 11b and the back surface 11c of the insert pin 11. Therefore, the front recess 16 and the back recess 17 each penetrate the insert pin 11 in the widthwise direction and have left openings 16a, 17a on the left side in the widthwise direction and right openings 16b, 17b on the right side in the widthwise direction.

[0035] Fig. 6A is a front view of the second separable insert 20 as seen from the front side, Fig. 6B is a rear view of the second separable insert 20 as seen from the back side, and Fig. 6C is a left side view of the second separable insert 20 as seen from the left side in the width direction. Fig. 7 is a front view of the second separable insert 20 as seen from the front side, showing the box 21 as seen from the cross section arrows VII-VII in Fig. 6C. Fig. 8 is a rear view of the second separable insert 20 as seen from the back side, showing the box 21 as seen from the cross section arrows VIII-VIII in Fig. 6C.

[0036] 1 to 2, 4, and 6A to 8, the second separable insert 20 is a box 21 provided to cover the widthwise inner edge side of the lower end of the second stringer 30B. Although not shown, the first separable insert 10 may have a structure including the box 21, a second reinforcing strip extending upward and away from the right side surface of the box 21 to the widthwise right, and a second connecting portion connecting the box 21 and the second reinforcing strip.

[0037] The box 21 has a box body 21a having a butterfly pin hole 25 (see Figure 4, etc.) in the left half, through which the butterfly pin 11 is inserted and removed in the vertical direction (longitudinal direction of the slide fastener 100), and a box pin 21b protruding upward from the right half of the top surface of the box body 21a.

[0038] In the front-to-back direction, the box pin 21b has approximately the same thickness as the insert pin 11. When the insert pin 11 is inserted into the insert pin hole 25 of the box body 21a, the first and second separable insert portions 10, 20 are connected (see FIG. 1), and the bottom ends of the first and second stringers 30A, 30B are aligned. When the insert pin 11 is removed from the insert pin hole 25 of the box body 21a, the connection between the first and second separable insert portions 10, 20 is released (see FIG. 2).

[0039] The box pin 21b is provided along the inner edge side in the width direction of the second stringer 30B and is molded integrally with the box body 21a. The box pin 21b has a locking portion 21d at the upper end of the left side of the box pin 21b that protrudes toward the first tape 31a (left side). The locking portion 21d is formed in the center of the box pin 21b in the front-to-back direction. When the first and second separable inserting portions 10, 20 are connected, the locking portion 21d of the box pin 21b is locked into the locking groove portion 11e of the insert pin 11 (see FIG. 5C ).

[0040] The slider 40 can be moved from the state shown in Fig. 1 to the lowest position where it abuts against the box body 21a. With the slider 40 moved from the state shown in Fig. 1 to the lowest position where it abuts against the separable bottom end stop 1, the insert pin 11 of the first separable bottom end insert 10 can be removed from the box body 21a and then pulled upward through the element guide path between the front and rear blades 43, 44 of the slider 40, thereby releasing the connection between the first separable bottom end insert 10 and the second separable bottom end insert 20, and thereby separating the first stringer 30A and the second stringer 30B. At this time, the slider 40 remains on the second stringer 30B.

[0041] The box 21 of this embodiment includes a box pin 21b that is aligned parallel to the right side R (second tape 31b side) of the upper part of the insert pin 11 that extends vertically, and a box body 21a that has an insert pin hole 25 through which the lower part of the insert pin 11 can be inserted and removed. The insert pin hole 25 is formed in the top surface of the box body 21a on the left side L (first tape 31a side), and the box pin 21b is joined to the top surface of the box body 21a on the right side R (second tape 31b side) in a state where it protrudes upward.

[0042] The box body 21a is a hexahedron with front, back, left, right, top, and bottom surfaces. In the illustrated example, each surface is flat. "Flat" refers not only to flat surfaces but also to curved surfaces (convex and concave surfaces). For example, in the illustrated example, the front and back surfaces are convex curved surfaces (more specifically, surfaces that gradually convex toward the front from both lateral ends toward the middle). Furthermore, the box body 21a has a tape groove 61, into which the first tape 31a is inserted, on the left side of the left and right sides facing the first tape 31a. The tape groove 61 extends vertically, opening the upper end UP and closing the lower end DN. A slip pin hole 25 is connected to the right side R (the second tape 31b side) of the tape groove 61, and the upper end UP of the slip pin hole 25 is open. On the other hand, the lower side DN of the insert pin hole 25 is closed on the left side L (first tape 31a side) and penetrates on the right side R (second tape 31b side) to form a slide hole 63 .

[0043] The box 21a includes an upper and lower extension wall 53 extending downward DN from the lower end of the box pin 21b, a front body wall 54 and a rear body wall 55 protruding parallel to the left side L (first tape 31a side) in the left-right direction from both front and rear end portions of the upper and rear extension wall 53, a joining wall 56 joining the ends of the left sides L (first tape 31a side) of the front body wall 54 and the rear body wall 55 at the lower end portions of their entire lengths in the up-down direction, and groove walls 57, 57 protruding from the ends of the left sides L (first tape 31a side) of the front body wall 54 and the rear body wall 55 so as to narrow the front-back gap formed between the front body wall 54 and the rear body wall 55. The space formed between the pair of front and rear groove walls 57, 57 forms a tape groove 61. In the illustrated example, each groove wall 57 is formed over the entire range above the joint wall 56 within the entire vertical length of the front and rear barrel walls 54, 55. Therefore, the joint wall 56 is continuous with the lower part DN of the pair of front and rear groove walls 57, 57. Furthermore, the box 21 of this embodiment has a symmetrical shape on the front and back, and the tape groove 61 is located in the center of the box 21 in the front and back directions.

[0044] The upper and lower extension walls 53 are rod-shaped with a rectangular cross section. In the illustrated example, the left-right width of the upper and lower extension walls 53 is wider than the box pin 21b. The left side surface (the surface of the upper and lower extension walls 53 facing the insert pin hole 25) of the left side L (the first tape 31a side) of the upper and lower extension walls 53 is located to the left of the box pin 21b, forming the right side surface 25c of the insert pin hole 25 and the right wall 63b of the slide hole 63. The right side surface of the right side R (the second tape 31b side) of the upper and lower extension walls 53 protrudes to the right R beyond the box pin 21b. The front body wall 54 and the rear body wall 55, which protrude from both the front and rear ends of the upper and lower extension walls 53 to the left side L (the first tape 31a side), are both plate-shaped.

[0045] The joint wall 56 has a groove closing portion 56a that closes the lower portion of the tape groove 61, and a hole closing portion 56b that closes the first tape 31a side below the insert pin hole 25. Therefore, the space surrounded by the joint 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 Figures 12 to 14) for resin molding, which will be described later, is inserted, and the slide hole 63 communicates with the insert pin hole 25.

[0046] The inner surface constituting the insert pin hole 25 of the box 21 includes a front side surface 25a formed by the back surface of the front body wall 54 and facing the front surface 11b of the insert pin 11, a back side surface 25b formed by the front surface of the back body wall 55 and facing the back surface 11c of the insert pin 11, a right side surface 25c formed by the left side surface on the first tape 31a side of the upper and lower extension walls 53 and facing the right side surface on the second tape 31b side of the insert pin 11, and a pair of left side surfaces 25d, 25d formed by the right sides on the second tape 31b side of the pair of front and back groove walls 57, 57 and facing the left side surface on the first tape 31a side of the insert pin. The pair of left side surfaces 25d, 25d are separated from each other in the front-to-back direction because the tape groove 61 is interposed between them in the front-to-back direction.

[0047] Of the inner surfaces constituting the insert pin hole 25 of the box 21, the front side surface 25a and the back side surface 25b that face the front surface 11b and the back surface 11c of the insert pin 11 are provided with protrusions 26, 27 that can engage with the front recess 16 and the back recess 17 of the insert pin 11, respectively. Note that the protrusions 26, 27 do not necessarily have to be provided on both the front side surface 25a and the back surface 25b, but may be provided on at least one of the front side surface 25a and the back surface 25b. Of the protrusions 26, 27, the one provided on the front side surface 25a (the back wall of the front body wall 54) is called the front protrusion 26, and the one provided on the back surface 25b is called the back protrusion 27.

[0048] As shown in Figures 7A and 7B, the front side convex portion 26 and the back side convex portion 27 each have an asymmetric shape with respect to a plane P that passes through the center of the front side convex portion 26 and the back side convex portion 27 in the insertion / removal direction (up and down direction) of the insert pin 11 and is perpendicular to the insertion / removal direction.

[0049] More specifically, the front-side convex portion 26 includes an upper inclined surface 26a that slopes downward from the upper end of the front-side convex portion 26 in the insertion / removal direction (vertical direction) of the insert pin 11, thereby increasing the thickness of the front-side convex portion 26, and a lower inclined surface 26b that slopes downward from the lower end of the front-side convex portion 26 in the insertion / removal direction of the insert pin 11, thereby increasing the thickness of the front-side convex portion 26,

[0050] In addition, the back-side convex portion 27 includes an upper inclined surface 27a that slopes toward the front as it moves downward DN from the upper end of the back-side convex portion 27 in the insertion / removal direction (up and down direction) of the insert pin 11, thereby increasing the thickness of the back-side convex portion 27, and a lower inclined surface 27b that slopes toward the front as it moves upward UP from the lower end of the back-side convex portion 27 in the insertion / removal direction of the insert pin 11, thereby increasing the thickness of the back-side convex portion 27, and the slope of the upper inclined surface 27a is greater than the slope of the lower inclined surface 27b.

[0051] In this way, the inclination of the upper inclined surfaces 26a, 27a that come into contact when the insert pin 11 is inserted into the insert pin hole 25 is set to be relatively steep, and the inclination of the lower inclined surfaces 26b, 27b that come into contact when the insert pin 11 is pulled out of the insert pin hole 25 is set to be relatively gentle, so that the force Fin required to insert the insert pin 11 into the insert pin hole 25 is greater than the force Fout required to pull out the insert pin 11 from the insert pin hole 25 (Fin > Fout).

[0052] The front-side protrusion 26 and the back-side protrusion 27 each include parallel surfaces 26c, 27c that connect the upper inclined surfaces 26a, 27a and the lower inclined surfaces 26b, 27b, and are parallel to the insertion / removal direction (vertical direction) and width direction (horizontal direction) of the insert pin 11. These parallel surfaces 26c, 27c are positioned so as to intersect with the plane P.

[0053] As described above, the front-side recess 16 and rear-side recess 17 of the insert pin 11 are formed over the entire width of the insert pin 11, whereas the front-side protrusion 26 and rear-side protrusion 27 of the box 21 are formed over a portion of the width of the insert pin hole 25 rather than over the entire width of the insert pin hole 25. The left-right lengths of the front-side recess 16 and rear-side recess 17 are greater than the left-right lengths of the front-side protrusion 26 and rear-side protrusion 27. The vertical lengths of the front-side recess 16 and rear-side recess 17 are also approximately equal to the vertical lengths of the front-side protrusion 26 and rear-side protrusion 27.

[0054] When the insert pin 11 is fully inserted into the insert pin hole 25 of the box 21, the front convex portion 26 and the back convex portion 27 of the box 21 engage with the front concave portion 16 and the back concave portion 17 of the insert pin 11, preventing the insert pin 11 from slipping out of the box 21. Therefore, after the insert pin 11 is assembled with the box 21, the insert pin 11 does not shift, making it difficult for misassembly of elements to occur and also making it easy to pull up the slider 40.

[0055] As described above, the inclination of the upper inclined surfaces 26a, 27a is greater than the inclination of the lower inclined surfaces 26b, 27b, and the inclination of the upper inclined surfaces 26a, 27a that come into contact when the insert pin 11 is inserted into the insert pin hole 25 is relatively steep, so the force Fin required to insert the insert pin 11 into the insert pin hole 25, that is, the force required for the insert pin 11 to get over and engage the protrusions 26, 27, is set to be relatively large. Specifically, Fin is set to 4 to 6 N.

[0056] Therefore, a relatively large force is required to completely insert the insert pin 11 into the insert pin hole 25, and the resistance and sound produced when the insert pin 11 overcomes the protrusions 26, 27 gives the user a sense of insertion or a clicking sensation, as if the insert pin 11 is securely fitted, and the user can properly recognize that the insert pin 11 has been completely inserted into the box 21.

[0057] In particular, in this embodiment, the recesses 16, 17 are provided on the front surface 11b and back surface 11c of the insert pin 11, respectively, and the protrusions 26, 27 are provided on the front side surface 25a and back side surface 25b of the insert pin hole 25, respectively. This increases the force Fin required to engage the protrusions 26, 27 with the recesses 16, 17, allowing the user to more reliably feel a click as if the insert pin 11 is securely inserted, making it possible to more appropriately recognize that the insert pin 11 has been fully inserted into the box 21. If the recesses 16 and 17 are positioned apart in the insertion / removal direction (up and down), the timing at which the recess 16 engages will differ from the timing at which the recess 17 engages. Therefore, it is preferable that the positions of the recesses 16 and 17 in the insertion / removal direction be the same or close to each other. The same applies to the corresponding protrusions 26, 27.

[0058] Furthermore, the convex portions 26, 27 smoothly connect the upper inclined surfaces 26a, 27a and the lower inclined surfaces 26b, 27b, and have parallel surfaces 26c, 27c that are parallel to the insertion / removal direction (up / down direction) and width direction (left / right direction) of the insert pin 11, so that the convex portions 26, 27 can engage with the concave portions 16, 17 with little rattling.

[0059] Furthermore, the recesses 16, 17 penetrate the insert pin 11 in the width direction and have left openings 16a, 17a and right openings 16b, 17b (see FIGS. 5A and 5B). Therefore, even if dust such as human dirt or clothing fibers enters the recesses 16, 17, it can be easily expelled from the left openings 16a, 17a and right openings 16b, 17b. Note that if such dust accumulates in the recesses 16, 17, it is undesirable because it prevents the user from getting a proper feeling of insertion when inserting the insert pin 11 into the insert pin hole 25.

[0060] Furthermore, as described above, the widthwise length of the recesses 16, 17 (the length between the left openings 16a, 17a and the right openings 16b, 17b) is set to be greater than the widthwise length of the protrusions 26, 27 (the length between the left side surfaces 26d, 27d and the right side surfaces 26e, 27e), so the protrusions 26, 27 fit easily into the recesses 16, 17. For example, the insert pin 11 may be inserted into the insert pin hole 25 at an angle in the widthwise direction (left-right direction), but even in this case, the recesses 16, 17 of the insert pin are reliably engaged with the protrusions 26, 27 of the insert pin hole 25. Furthermore, even if the protrusions 26, 27 come into contact with the recesses 16, 17 after engagement, the protrusions 26, 27 elastically deform in the widthwise direction within the recesses 16, 17, so that local stress on the protrusions 26, 27 can be prevented.

[0061] Furthermore, when the recesses 16, 17 and the protrusions 26, 27 are engaged, the gap between the recesses 16, 17 and the protrusions 26, 27 in the width direction (left-right direction) is larger than the gap between the recesses 16, 17 and the protrusions 26, 27 in the insertion / removal direction (up-down direction) of the insert pin 11. With this configuration, a clicking feeling is obtained when the recesses 16, 17 and the protrusions 26, 27 are engaged, and the protrusions 26, 27 are easily fitted into the recesses 16, 17. Note that the former gap in the width direction is relatively large, while the latter gap in the up-down direction is zero or very small.

[0062] When the insert pin 11 is pulled upward from a state in which it is completely inserted into the insert pin hole 25, the lower end of the insert pin 11 interferes with a pair of protrusions 26 and 27 on the front and back of the insert pin hole 25, as in the case of insertion.

[0063] More specifically, when the insert pin 11 is pulled out of the insert pin hole 25, the lower inclined surfaces 16e, 17e of the recesses 16, 17 on the front and back of the insert pin 11 come into contact with the lower inclined surfaces 26b, 27b of the pair of front and back protrusions 26, 27. By providing the box 21 and the insert pin 11 with multiple inclined surfaces 26b, 27b, 16e, 17e, the insert pin 11 is smoothly guided between the pair of front and back protrusions 26, 27. Then, the parallel surfaces 18c, 19c on the front and back of the insert pin 11 abut against the lower inclined surfaces 26b, 27b and parallel surfaces 26c, 27c of the convex portions 26, 27, and the insert pin 11 overcomes the convex portions 26, 27 while pushing the box 21 outward in the front-to-back direction, thereby disengaging the front-side recess 16 and back-side recess 17 of the insert pin 11 from the front-side convex portions 26 and back-side convex portions 27 of the box 21.

[0064] As described above, the inclination of the lower inclined surfaces 26b, 27b is smaller than the inclination of the upper inclined surfaces 26a, 27a, and the inclination of the lower inclined surfaces 26b, 27b that come into contact when the insert pin 11 is pulled out of the insert pin hole 25 is relatively gentle, so the force Fout required to pull the insert pin 11 out of the insert pin hole 25, i.e., the force required for the insert pin 11 to overcome the protrusions 26, 27 and release the engagement, is set to be relatively small.

[0065] 7 and 8, the front-side protrusion 26 and the back-side protrusion 27 are inclined toward the first side (left side L) in the left-right direction as they extend downward DN. Of the inner surfaces 25a, 25b, 25c, and 25d that constitute the insert pin hole 25 of the box 21, the right side surface 25c on the second side (right side R) in the left-right direction is provided with an inclined surface 29 that is inclined toward the first side (left side L) in the left-right direction as it extends downward.

[0066] The right side surface 25c of the insert pin hole 25 includes a flat surface 22 that is disposed at the upper end of the right side surface 25c and extends parallel to the up-down direction, and an inclined surface 29 that connects to the lower end of the flat surface 22. In the illustrated example, the majority of the right side surface 25c is the inclined surface 29, and the vertical dimension of the inclined surface 29 is five times or more the vertical dimension of the flat surface 22.

[0067] The slide hole 63 communicating with the insert pin hole 25 is formed by the right side surface of the joining wall 56 (hole closing portion 56b), the left side surface of the upper and lower extension wall 53, the back surface of the front body wall 54, and the surface of the back body wall 55. Of these, the right side surface of the joining wall 56 (hole closing portion 56b) forms the left wall 63a of the slide hole 63, and the lower part of the left side surface of the upper and lower extension wall 53 forms the right wall 63b of the slide hole 63.

[0068] The inclined surface 29 on the right side surface 25c of the insert pin hole 25 and the right wall 63b of the slide hole 63 are smoothly connected to form the same plane. Therefore, the right wall 63b is also inclined at the same inclination angle α1 as the inclined surface 29. The inclination angle α1 of the inclined surface 29 and the right wall 63b with respect to the vertical direction is approximately 8°. Figures 7 and 8 show the inclination angle α1 formed by the extension line S1 of the inclined surface 29 and the right wall 63b and the vertical direction.

[0069] The left side wall 63a of the slide hole 63 is inclined toward the first side (left side L) in the left-right direction as it extends downward DN, similar to the inclined surface 29 of the right side surface 25c of the insert pin hole 25 and the right side wall 63b of the slide hole 63. The inclination angle α2 of the left side wall 63a of the slide hole 63 with respect to the up-down direction is approximately 8°. Figures 7 and 8 show the inclination angle α2 formed by the extension line S2 of the left side wall 63a of the slide hole 63 and the up-down direction.

[0070] The inclined surface 29 of the insert pin hole 25 and the extension line S1 of the right side wall 63b of the slide hole 63 are parallel to the extension line S2 of the left side wall 63a of the slide hole 63, and therefore the inclination angles α1 and α2 are the same (α1 = α2 ≈ 8°). Thus, the inclination angle of the slide hole 63 is α1 or α2, which is approximately 8°.

[0071] The left side surfaces 26d, 27d of the front-side protrusion 26 and the back-side protrusion 27 are located on an extension line S2 of the left wall 63a of the slide hole 63. The right side surfaces 26e, 27e of the front-side protrusion 26 and the back-side protrusion 27 are parallel to the left side surfaces 26d, 27d. Therefore, the left side surfaces 26d, 27d and the right side surfaces 26e, 27e of the front-side protrusion 26 and the back-side protrusion 27 are parallel to the extension line S2, which is inclined at an inclination angle α2, and the inclination angle of the front-side protrusion 26 and the back-side protrusion 27 is equal to α2, i.e., approximately 8°. Thus, the inclination angle α2 of the front-side protrusion 26 and the back-side protrusion 27 relative to the up-down direction, the inclination angle α1 of the inclined surface 29 of the insert pin hole 25 relative to the up-down direction, and the inclination angles α1, α2 of the slide hole 63 relative to the up-down direction are all the same.

[0072] The front-side protrusion 26 and the back-side protrusion 27 are located in the vertical direction between the upper and lower ends of the inclined surface 29 of the insert pin hole 25. More specifically, as shown by dashed lines in Figures 7 and 8, the entire front-side protrusion 26 and the back-side protrusion 27 are arranged in the vertical direction between an upper flat surface 29a that passes through the upper end of the inclined surface 29 and is vertically perpendicular, and a lower flat surface 29b that passes through the lower end of the inclined surface 29 and is vertically perpendicular. More preferably, as in the illustrated example, the entire front-side protrusion 26 and the back-side protrusion 27 are located between the lower flat surface 29b and a vertical center 29c between the upper flat surface 29a and the lower flat surface 29b.

[0073] Fig. 9A is a diagram showing a state in which the insert pin is being inserted into the insert pin hole of the box, with the slider partially cut away. Fig. 9B is a diagram showing the same state as Fig. 9A, with the slider viewed from the front. Fig. 9C is a diagram showing the same state as Fig. 9A, with the box partially cut away. Note that Fig. 9C shows only the guide post 45 of the slider 40.

[0074] To connect the left and right fastener stringers 30A, 30B, first, as shown in Figures 9A to 9C, with the first and second fastener stringers 30A, 30B separated, the slider 40 is positioned at the lowest position in contact with the box 21. Then, the insert pin 11 is passed through the element guide path 47 of the slider 40 and then inserted into the insert pin hole 25 of the box 21.

[0075] 9C, the insert pin 11 is inserted into the insert pin hole 25 at an insertion angle θ with respect to the up-down direction. Then, the tip (lower end) of the insert pin 11 comes into contact with the inclined surface 29 of the insert pin hole 25. At this time, the protrusion 11a of the insert pin 11 abuts against the lower tapered surface 45a of the guide pillar 45 of the slider 40. A pair of tapered surfaces 45a are provided at the lower end of the slider 40, and are inclined downward so as to extend to the center in the left-right direction.

[0076] Here, as shown in Figure 9B, the slider 40 and the box 21 are in contact with each other and there is zero gap between them, and as shown in Figure 9C, the vertical distance between the lower end of the guide post 45 of the slider 40 and the upper end of the box pin 21b is L.

[0077] When the insert pin 11 is further inserted from the state shown in Figures 9A to 9C, the insert pin 11 comes into contact with the inclined surface 29, and a rotational moment is applied to the insert pin 11 in the direction in which the insertion angle θ decreases (clockwise in the figure).

[0078] Fig. 10A is a diagram showing the state in which the insert pin has been completely inserted into the insert pin hole of the box, with the slider partially cut away. Fig. 10B is a diagram showing the same state as Fig. 10A, with the slider viewed from the front. Fig. 10C is a diagram showing the same state as Fig. 10A, with the slider and box partially cut away. Note that Fig. 10C only shows the guide post 45 of the slider 40.

[0079] 10A to 10C, the insert pin 11 to which a rotational moment is applied presses against the tapered surface 45a of the guide post 45 of the slider 40, and while rotating and pushing the slider 40 upward UP, moves downward DN and meshes with the box pin 21b. The insert pin 11 is prevented from moving further downward DN when its lower end abuts against the hole closing portion 56b of the joint wall 56. Note that this hole closing portion 56b can serve as a fulcrum when the insert pin 11 rotates in a direction that reduces the insertion angle θ.

[0080] As shown in Figure 10B, the vertical gap distance between the slider 40 that has moved upward and the box 21 is a, and as shown in Figure 10C, the vertical distance between the lower end of the guide post 45 of the slider 40 and the upper end of the box pin 21b is L + a.

[0081] In this way, simply by inserting the insert pin 11 into the box 21, the slider 40 automatically rises to a position spaced a distance a from the box 21. Therefore, the projection 11a (semi-engaging tooth) of the insert pin 11 and the box pin 21b mesh together, and the projection 11a of the insert pin 11 and the first element 32A on the second fastener stringer 30B side also mesh together. As in this embodiment, by guiding the meshing of the insert pin 11 with the box pin 21b and the first element 32A when inserting the insert pin 11, it becomes possible to smoothly start the slider 40 when it is subsequently pulled up, improving operability.

[0082] Furthermore, because the front-side convex portion 26 and the back-side convex portion 27 are inclined in the same direction as the inclined surface 29, the insert pin 11 guided by the inclined surface 29 can smoothly climb over the front-side convex portion 26 and the back-side convex portion 27, providing good operability. Furthermore, because the insert pin 11 gains momentum when climbing over the front-side convex portion 26 and the back-side convex portion 27, the rotational moment increases, reliably lifting the slider 40 and more reliably guiding the insert pin 11 into engagement with the box pin 21b and the first element 32A.

[0083] In particular, in this embodiment, the inclination angle α2 of the front-side convex portion 26 and the back-side convex portion 27 is the same as the inclination angle α1 of the inclined surface 29, so the insert pin 11 guided by the inclined surface 29 can smoothly climb over the front-side convex portion 26 and the back-side convex portion 27, resulting in good operability.

[0084] Furthermore, since the front-side convex portion 26 and the back-side convex portion 27 are located between the upper end (upper flat surface 29a) and the lower end (lower flat surface 29b) of the inclined surface 29 in the vertical direction, the insert pin 11 will climb over the front-side convex portion 26 and the back-side convex portion 27 after a rotational moment begins to be applied to the insert pin 11 by abutting against the inclined surface 29. This makes it possible to impart momentum to the rotation of the insert pin 11, and more reliably induce the insert pin 11 to mesh with the box pin 21b and the first element 32A.

[0085] From the viewpoint of further imparting momentum to the rotation of the insert pin 11, it is preferable that the entire front-side protrusion 26 and the entire back-side protrusion 27 be located between the lower plane 29b and the vertical central portion 29c of the upper plane 29a and the lower plane 29b, as shown in Figures 7 and 8. By providing the front-side protrusion 26 and the back-side protrusion 27 below the insert pin hole 25 in this way, the insert pin 11 gains momentum within the insert pin hole 25, and then climbs over the front-side protrusion 26 and the back-side protrusion 27, thereby further impetus to its rotation.

[0086] 11A is a diagram showing the state in which the insert pin has been inserted into the insert pin hole of the box in a comparative example in which the insert pin hole does not have an inclined surface, with the slider partially cut away, and FIG. 11B is a diagram showing the same state as FIG. 11A in a comparative example in which the insert pin hole does not have an inclined surface, with the slider viewed from the front.

[0087] In the comparative example shown in FIGS. 11A and 11B , the right side surface 25 c of the insert pin hole 25 of the box 21 is formed only by the flat surface 22 (see FIGS. 7 and 8 ), and the inclined surface 29 is not provided. FIGS. 11A and 11B show a state in which the insert pin 11 has been completely inserted into the insert pin hole 25, but the slider 40 remains in contact with the box 21, and there is no gap between the slider 40 and the box 21. That is, in the comparative example, because the insert pin hole 25 does not have the inclined surface 29, no rotational moment is generated in the insert pin 11 in a direction that reduces the insertion angle θ, and the slider 40 is not pushed up by the insert pin 11. Also, as shown in FIG. 11A , the insert pin 11 and the box pin 21 b are slightly separated, and the insert pin 11 and the box pin 21 b are not completely engaged. Therefore, in the comparative example, the startability of lifting the slider 40 is worse than in this embodiment.

[0088] [Method of Manufacturing Box] The method of manufacturing the box 21 of the above-described embodiment uses injection molding using resin as the raw material.

[0089] Fig. 12 is a surface view of a molding die used in the method for manufacturing a box, showing the first and second slides in a mold-open state. Fig. 13 is a surface view of a molding die used in the method for manufacturing a box, showing the first and second slides in a mold-closed state.

[0090] 12 and 13, the injection mold used in this manufacturing method includes a fixed mold 5, a movable mold (not shown) supported so as to be able to reciprocate in the front-to-back direction relative to the fixed mold 5, and first and second slides 7 and 8 which are able to reciprocate in the up-and-down direction relative to the fixed mold 5. Although the movable mold is not shown, it is arranged closer to the front surface than the fixed mold 5 and the first and second slides 7 and 8 (toward the viewer in FIGS. 12 and 13).

[0091] When the injection molding die is closed, it forms a cavity 91 as a space corresponding to the shape of the box 21, a gate 92 as a passage leading to the cavity 91, and a runner 93 as a passage leading to the gate 92.

[0092] The cavity 91 includes a box pin recess 21bx that forms the outer shape of the box pin 21b and a box body recess 21ax that forms the outer surfaces (so-called six faces) of the outer shape of the box body 21a. The cavity 91 is provided in the fixed mold 5 and the movable mold.

[0093] In this embodiment, the parting line formed on the finished box 21 is located at the midpoint of the overall height and width in the front-to-back direction of the box 21, and therefore the fixed mold 5 and the movable mold are formed to have symmetrical shapes on the front and back. The surface of the fixed mold 5 (the surface that abuts against the movable mold) is formed with the back half of the box pin recess 21bx and the back half of the box body recess 21ax.

[0094] The movable mold (not shown) has a symmetrical shape to the fixed mold 5, and therefore the front half of the box pin recess 21bx and the front half of the box body recess 21ax are formed on the back surface of the movable mold (the surface that abuts against the fixed mold 5).

[0095] The first slide 7 comprises a first base portion 71 on the underside of the box body 21a, which mainly forms the underside of the joining wall 56 (more specifically, the left end portion of the underside of the upper and lower extension walls 53 and the joining wall 56), a first slide main body portion 72 which protrudes upward from the upper surface of the first base portion 71, and a first side surface forming portion 73 on the side of the box body 21a, which forms the left side of the joining wall 56, and which protrudes upward from the left end portion of the first base portion 71.

[0096] The first slide 7 has a shape that inclines toward the second side (right side R) in the left-right direction as it extends upward. The inclination angle of the first slide 7 is represented by α1, α2, α3, etc., and is approximately 8°.

[0097] The first base portion 71 is shaped to slope upward toward the second side (right side R) in the left-right direction. The inclination angle α3 of the first base portion 71 relative to the up-down direction is approximately 8°, which is the same as the inclination angle α1 of the inclined surface 29 of the insert pin hole 25 relative to the up-down direction and the inclination angles α1 and α2 of the slide hole 63 relative to the up-down direction (α1 = α2 = α3 ≈ 8°). The first slide 7 can reciprocate up and down along the direction of the inclination of the first base portion 71 at the inclination angle α3.

[0098] The first slide main body portion 72 is rod-shaped and extends vertically, and includes a slide hole protrusion 63x that protrudes upward from the first base portion 71 to form the slide hole 63, and a second side portion protrusion 25y that forms the second side (right side R) in the left-right direction of the butterfly pin hole protrusion 25x that forms the butterfly pin hole 25, and that protrudes upward from the slide hole protrusion 63x.

[0099] The slide hole protrusion 63x has a shape that slopes downward toward the first side (L) in the left-right direction, similar to the slide hole 63. The slope angle of the slide hole protrusion 63x with respect to the up-down direction is the same as the slope angles α1 and α2 of the slide hole 63.

[0100] The second side partial protrusion 25y has a first base portion 25ya that is connected to the slide hole protrusion 63x and extends upward, and a first tip portion 25yb that is connected to the first base portion 25ya and extends upward.

[0101] The first base portion 25ya is an upward extension of the entire upper end of the slide hole protrusion 63x, and therefore has a cross-sectional shape that is a trapezoidal rod shape that is substantially the same as the cross-sectional shape of the slide hole protrusion 63x. Therefore, like the slide hole protrusion 63x, the first base portion 25ya has a shape that slopes downward toward the first side (L) in the left-right direction. The inclination angle of the first base portion 25ya with respect to the up-down direction is the same as the inclination angles α1 and α2 of the slide hole protrusion 63x.

[0102] The first tip portion 25yb is a rod-like member with a trapezoidal cross section, and extends upward from the second-side (right side R) portion of the upper end of the first base portion 25ya, rather than from the entire upper end of the first base portion 25ya. Therefore, the thickness of the first tip portion 25yb in the front-to-back direction is equal to the thickness of the first base portion 25ya in the front-to-back direction, but the width of the first tip portion 25yb in the left-to-right direction is smaller than the width of the first base portion 25ya in the left-to-right direction. Therefore, the second side portion convex portion 25y has a stepped rod shape formed by the first base portion 25ya, which has a larger width in the left-to-right direction, and the first tip portion 25yb, which has a smaller width in the left-to-right direction.

[0103] The right side surface of the first base portion 25ya and the portion of the right side surface of the first tip portion 25yb excluding the upper end portion constitute an inclined surface forming portion 29x for forming the inclined surface 29 of the insert pin hole 25. Like the inclined surface 29, the inclined surface forming portion 29x has a shape that slopes downward toward the first side (L) in the left-right direction. The inclination angle of the inclined surface forming portion 29x with respect to the up-down direction is the same as the inclination angle α1 of the inclined surface 29. Furthermore, the upper end portion of the right side surface of the first tip portion 25yb constitutes a flat surface forming portion 22x for forming the flat surface 22 of the insert pin hole 25.

[0104] The left side surface of the first tip portion 25yb has a shape that slopes downward toward a first side (left side L) in the left-right direction. Here, the left side surface of the first tip portion 25yb serves as a first mating surface 25yc that is mated with a right side surface (second mating surface 25zc) of the second base portion 25za (described later) during mold clamping. The first mating surface 25yc slopes downward toward the first side (left side L) in the left-right direction. Figures 12 and 13 illustrate the inclination angle β of the first mating surface 25yc with respect to the up-down direction. As described in detail below, this inclination angle β is, for example, approximately 9° and is set larger than the inclination angles α1, α2, and α3 (β ≒ 9° > α1 = α2 = α3 ≒ 8°).

[0105] Furthermore, a first recess 26x is recessed on the first side (left side L) of the upper end of the first base portion 25ya, which has a concave shape facing the back side B and forms the front side convex portion 26 together with a second recess 26y described later.

[0106] The first recess 26x has a shape corresponding to the lower half of the front-side protrusion 26 to form the lower half of the front-side protrusion 26. That is, the bottom surface of the first recess 26x includes a lower inclined surface forming portion that forms the lower inclined surface 26b of the front-side protrusion 26 and that slopes toward the back side B as it extends upward UP from the lower end of the first recess 26x, thereby increasing the depth of the first recess 26x in the front-back direction, and a parallel surface lower half forming portion that is parallel to the up-down and width directions and forms the lower half of the parallel surface 26c of the front-side protrusion 26. The upper edge of the first recess 26x is a tapered surface that extends upward toward the second side (right side R), and this tapered surface abuts against the tapered surface of the lower edge of the second recess 26y, which will be described later.

[0107] The upper end of the first side surface forming portion 73 serves as a first abutting surface 73a that abuts against a lower end (second abutting surface 83a) of a second side surface forming portion 83 (described later) of the second slide 8. The first abutting surface 73a slopes upward as it approaches the first side (left side L) in the left-right direction. In the illustrated example, the first abutting surface 73a has a curved shape, but it may also be a linearly inclined surface.

[0108] The second slide 8 comprises a second base portion 81 on the upper surface side of the box body 21a and forming the left side L of the upper and lower extension wall 53, a second slide main body portion 82 protruding downward from the second base portion 81, and a second side surface forming portion 83 which forms the left side surface of the groove wall 57 among the side surfaces of the box body 21a and protrudes downward from the left end portion of the second base portion 81.

[0109] The second base portion 81 has a shape that extends parallel to the vertical direction. The second slide 8 is capable of reciprocating parallel to the vertical direction along the second base portion 81. That is, the first slide 7 reciprocates at an inclination angle α3 (α3 = α1 = α2 ≈ 8°) relative to the vertical direction, whereas the second slide 8 reciprocates parallel to the vertical direction without being inclined relative to the vertical direction.

[0110] The second slide main body portion 82 includes a first side partial protrusion 25z that forms a portion on the first side (left side L) in the left-right direction of the insert pin hole protrusion 25x, and a tape groove protrusion 61x that forms the tape groove 61. In order from the right side R to the left side L, the first side partial protrusion 25z, the tape groove protrusion 61x, and the second side surface forming portion 83 protrude downward from the underside of the second base portion 81.

[0111] The first side partial convex portion 25z has a second base portion 25za extending downward from the lower surface of the second base portion 81, and a second tip portion 25zb connecting to the second base portion 25za and extending downward.

[0112] The second base portion 25za is shaped like a rod with a trapezoidal cross section. The right side surface of the second base portion 25za slopes downward toward a first side (L) in the left-right direction. Here, the right side surface of the second base portion 25za serves as a second contact surface 25zc that comes into contact with the left side surface (first contact surface 25yc) of the first tip end 25yb of the first slide 7 during mold clamping. The first contact surface 25yc and the second contact surface 25zc have the same inclination angle β relative to the up-down direction. This inclination angle β is, for example, approximately 9° and is set larger than the inclination angles α1, α2, and α3 (β ≒ 9° > α1 = α2 = α3 ≒ 8°).

[0113] The second tip portion 25zb is a rod-like member with a trapezoidal cross section, and extends downward from the left portion of the lower end of the second base portion 25za, rather than from the entire lower end of the second base portion 25za. Therefore, the thickness of the second tip portion 25zb in the front-to-back direction is equal to the thickness of the second base portion 25za in the front-to-back direction, but the width of the second tip portion 25zb in the left-to-right direction is smaller than the width of the second base portion 25za in the left-to-right direction. Therefore, the first side portion convex portion 25z has a stepped rod shape formed by the second base portion 25za, which has a larger width in the left-to-right direction, and the second tip portion 25zb, which has a smaller width in the left-to-right direction.

[0114] Furthermore, a second recess 26y is provided on the second side (right side R) in the left-right direction of the lower end of the second base portion 25za, which has a concave shape facing toward the back side and forms the front side convex portion 26 together with the above-mentioned first recess 26x.

[0115] The second recess 26y has a shape corresponding to the upper half of the front-side protrusion 26, since it forms the upper half of the front-side protrusion 26. That is, the bottom surface of the second recess 26y includes an upper inclined surface forming portion that forms the upper inclined surface 26a of the front-side protrusion 26 and that slopes downward from the upper end of the first recess 26x to increase the depth of the second recess 26y in the front-back direction, and an upper parallel surface forming portion that is parallel to the up-down and width directions and forms the upper half of the parallel surface 26c of the front-side protrusion 26. The lower edge of the second recess 26y is a tapered surface that tapers downward toward the first side (left side L), and this tapered surface abuts against the tapered surface of the upper edge of the first recess 26x.

[0116] The lower end of the second side surface forming portion 83 forms a second abutting surface 83a that abuts against the upper end (first abutting surface 73a) of the first side surface forming portion 73 of the first slide 7. The second abutting surface 83a slopes upward as it approaches the first side (left side L) in the left-right direction. In the illustrated example, the second abutting surface 83a has a curved shape, but it may also be a linearly inclined surface.

[0117] As shown in Figure 13, in the mold closed state, the second friction surface 25zc, which is the right side surface of the first side portion convex portion 25z, and the first friction surface 25yc, which is the left side surface of the second side portion convex portion 25y, are frictionally contacted, and the first side portion convex portion 25z and the second side portion convex portion 25y form an insert pin hole convex portion 25x for forming the insert pin hole 25.

[0118] Furthermore, the tapered surface of the upper edge of the first recess 26x and the tapered surface of the lower edge of the second recess 26y come into surface contact, so that the first recess 26x and the second recess 26y are butted together in the vertical direction, and a front-side convexity forming portion 26z for shaping the front-side convexity 26 is formed.

[0119] The front-side convexity forming portion 26z consisting of the first recess 26x and the second recess 26y has a shape corresponding to the front-side convexity 26, and therefore the inclination of the upper inclined surface forming portion 26ax of the second recess 26y is greater than the inclination of the lower inclined surface forming portion 26bx of the first recess 26x, corresponding to the fact that the inclination of the upper inclined surface 26a of the front-side convexity 26 is greater than the inclination of the lower inclined surface 26b.

[0120] 12 and 13 show only the front sides of the first slide 7 and the second slide 8, and therefore only the first recess 26x and the second recess 26y of the front-side protrusion forming portion 26z that forms the front-side protrusion 26 have been described. However, the first slide 7 and the second slide 8 have symmetrical shapes on the front and back, and a back-side protrusion forming portion that forms the back-side protrusion 27 is provided on the back side of the first slide 7 and the second slide 8. The back-side protrusion forming portion is composed of a recess (not shown) that is symmetrical on the front and back with the first recess 26x and a recess (not shown) that is symmetrical on the front and back with the second recess 26y. When the mold is closed, these pairs of recesses (not shown) are butted together in the vertical direction to form the back-side protrusion forming portion that forms the back-side protrusion 27. The detailed structure of the back-side protrusion forming portion will be omitted because the description of the first recess 26x and the second recess 26y of the front-side protrusion forming portion 26z is applicable.

[0121] Gates 92 are formed on the first and second mating surfaces 73a, 83a of the first and second side surface forming portions 73, 83. The gates 92 extend in the left-right direction, and the entrance and exit portions of the gate 92 for the molten resin are formed with irregular shapes (in the illustrated example, the entrance portion has a larger diameter than the exit portion).

[0122] When the injection mold is clamped, the movable mold 6 abuts against the fixed mold 5, the first slide main body 72 of the first slide 7 moved upward UP abuts against the fixed mold 5, and the second slide 8 moved downward DN abuts against the first slide 7. When the first and second slides 7, 8 abut against each other, a joining wall space 56s corresponding to the shape of the joining wall 56 is formed by the first slide 7 and the second slide 8. The joining wall space 56s is a space corresponding to the shapes of the groove closing portion 56a and the hole closing portion 56b of the joining wall 56, and is a closed space corresponding to the shapes of the portions of the cavity 91 that close both the portion of the insert pin hole 25 on the tape groove 61 side and the portion below the tape groove 61.

[0123] According to the manufacturing method of the box 21 described above, the box 21 is obtained by injection molding using the fixed mold 5, the movable mold 6 provided so as to be reciprocable in the front-to-back direction relative to the fixed mold 5, and the first and second slides 7, 8 provided so as to be reciprocable in the up-down direction relative to the fixed mold 5, and the first recess 26x provided in the first slide 7 and the second recess 26y provided in the second slide 8 are butted together to form the convex portion forming portion 26z for forming the convex portions 26, 27, the first slide 7 has an inclined surface forming portion 29x for forming the inclined surface 29, the first slide 7 is reciprocable in a direction inclined with respect to the up-down direction at an inclination angle α3 that is the same as the inclination angle α1 of the inclined surface 29, and the second slide 8 is reciprocable in a direction parallel to the up-down direction.

[0124] According to this configuration, the convex portions 26, 27 and the inclined surface 29 can be provided on the inner surfaces 25a, 25b of the insert pin hole 25 of the box 21 by injection molding.

[0125] In addition, the first slide 7 and the second slide 8 have a first contact surface 25yc and a second contact surface 25zc that contact each other in the left-right direction, and the first contact surface 25yc and the second contact surface 25zc are inclined toward a first side L in the left-right direction as they extend downward, and the inclination angle β of the first contact surface 25yc and the second contact surface 25zc with respect to the up-down direction is greater than the inclination angle α3 of the first slide 7 in the reciprocating direction (β>α3).

[0126] This configuration prevents the tip (first tip 25yb) of the first slide 7, which is inserted at an angle, from colliding with the second slide 8, thereby ensuring that the first and second contact surfaces 25yc and 25zc are in contact with each other. Note that the first and second contact surfaces 25yc and 25zc, as well as the tapered surfaces of the first and second recesses 26x and 26y, which come into contact with each other during mold clamping, must be in contact with each other without any gaps to prevent molding defects. In this regard, if the inclination angle β of the first and second contact surfaces 25yc and 25zc relative to the vertical direction is set equal to the inclination angle α3 of the first slide 7 in the reciprocating direction (β = α3), this is undesirable because, when a shape error or insertion error occurs in the first slide 7 or the second slide 8, they may come into contact with each other at an unintended location, creating a gap and resulting in molding defects.

[0127] The first slide 7 is reciprocable up and down at an inclination angle α3 in a direction in which it inclines downward as it approaches the first side (left side L) in the left-right direction, and is abutted against the second slide 8. The inclination angle α3 can also be said to be an angle in which it inclines upward as it approaches the second side (right side R) in the left-right direction. Therefore, during mold clamping, a force is applied to the first slide 7 toward the second side (right side R), which is a direction in which the first slide 7 moves away from the second slide 8, and a gap may be created between the first and second slides 7, 8.

[0128] In order to prevent the formation of such a gap between the first and second slides 7, 8, the first butting surface 73a of the first slide 7 and the second butting surface 83a of the second slide 8 are inclined upward toward the first side (left side L) in the left-right direction. By bringing the first butting surface 73a and the second butting surface 83a into contact at an angle in this manner, the first slide 7 is prevented from moving toward the second side (right side R) when the molds are closed, thereby preventing molding defects.

[0129] Figure 14 is a cross-sectional view taken along line XIV-XIV in Figure 13. As shown in Figure 14, the first slide 7 and the second slide 8 have a first mold abutment surface 71a and a second mold abutment surface 81a that abut against a movable mold (not shown) when the molds are clamped. In the example shown, the first mold abutment surface 71a is provided on the front side F of the lower part of the first base portion 71 of the first slide 7, and the second mold abutment surface 81a is provided on the front side F of the upper part of the second base portion 81 of the second slide 8.

[0130] The first contact surface 71a is inclined downward toward the back side B, but is not inclined in the left-right direction. The second contact surface 81a is inclined upward toward the back side B, but is not inclined in the left-right direction. Therefore, the components of normals 71b, 81b that are perpendicular to the first contact surface 71a and the second contact surface 81a, respectively, only have components in the front-to-back direction (F, B) and the up-down direction (UP, DN), and do not have components in the left-to-right direction (L, R).

[0131] A movable mold (not shown) abuts against the first mold abutment surface 71a and the second mold abutment surface 81a from the front side F during mold clamping, applying forces f1 and f2. These forces f1 and f2 act along the normal lines 71b and 81b, respectively, and therefore have only front-to-back (F, B) and up-down (UP, DN) components, but no left-to-right (L, R) components. Therefore, no force is applied to the first and second slides 7 and 8 in the left-to-right (L, R) directions from the movable mold during mold clamping, preventing the first and second slides 7 and 8 from separating in the left-to-right direction, which would otherwise cause molding defects.

[0132] The present invention is not limited to the above-described embodiment, and modifications and improvements can be made as appropriate within the scope of feasibility.

[0133] In the above embodiment, the inclination angles α1, α2, and α3 are approximately 8°, but they are not limited to 8° and may be changed appropriately within a range of, for example, 3° to 13°. Furthermore, the inclination angle β is not limited to approximately 9° and may be changed appropriately within a range of, for example, 4° to 14° as long as α<β is satisfied.

[0134] Fig. 15 is a front view of a first separable insert portion according to a modified example, as viewed from the front side. As shown in Fig. 15, the insert pin 11 constituting the first separable insert portion 10 of the modified example differs from the insert pin 11 shown in Fig. 5A in that the left side surface 11d (side surface on the first side L) of the tip (lower end) of the insert pin 11 is inclined to the right (second side R) as it extends downward (DN). The inclination angle γ of the left side surface 11d of the insert pin 11 in Fig. 15 relative to the vertical direction is, for example, 3°. Note that the left side surface of the tip (lower end) of the insert pin 11 shown in Fig. 5A is parallel to the vertical direction and is not inclined to the right.

[0135] The right side surface 11f of the tip (lower end) of the insert pin 11 of the modified example shown in Figure 15 is inclined to the left as it goes downward, but the shape of this right side surface 11f is the same as that of the insert pin 11 shown in Figure 5A.

[0136] Figure 16 is a diagram showing the state in which the insert pin according to the modified example shown in Figure 15 has been completely inserted into the insert pin hole of the box. Note that the box pin 21b is not shown in Figure 16. As the insert pin 11 is inserted into the insert pin hole 25, the insert pin 11 comes into contact with the inclined surface 29, applying a rotational moment in a direction that reduces the insertion angle θ (see Figure 9C) (clockwise in the figure). When the insertion of the insert pin 11 into the insert pin hole 25 is complete, as shown in Figure 16, the left side surface 11d of the insert pin 11 comes into contact with the tape groove 61, becoming parallel to the vertical direction.

[0137] Here, because the left side surface 11d of the insert pin 11 in this modified example is an inclined surface having an inclination angle γ, when the left side surface 11d becomes parallel to the vertical direction, the insert pin 11 rotates to the right (toward the box pin 21b not shown) by the angle γ with respect to the vertical direction. Therefore, by providing the left side surface 11d with the inclination angle γ, the rotation moment of the insert pin 11 increases, and the force that presses against the tapered surface 45a of the guide post 45 of the slider 40 and pushes the slider 40 upward UP increases. This more reliably makes it possible to bring the protrusion 11a (semi-engaging tooth) of the insert pin 11 and the box pin 21b into an engaged state, while also bringing the protrusion 11a of the insert pin 11 into a substantially engaged state with the first element 32A on the second fastener stringer 30B side.

[0138] As described above, the present specification discloses the following:

[0139] [1] A slide fastener (100) comprising: a pair of left and right first and second fastener stringers (30A, 30B); at least one slider (40) for opening and closing the first and second fastener stringers (30A, 30B); and a separable bottom end stop (1) provided at the lower end of the first and second fastener stringers (30A, 30B) in the longitudinal direction, wherein the separable bottom end stop (1) comprises: a first separable insert portion (10) provided on the first fastener stringer (30A); and a second separable insert portion (20) provided on the second fastener stringer (30B) and capable of connecting to and disconnecting from the first separable insert portion (10), wherein the first separable insert portion (10) includes an insert pin (11) provided on the inner edge side of the first fastener stringer (30A) in the width direction, The second separable inserting portion (20) includes a box (21) provided on the widthwise inner edge side of the second fastener stringer (30B), the box (21) has an insert pin hole (25) that opens upward (UP) and allows the insert pin (11) to be inserted and removed in the longitudinal direction, at least one of the front surface (11b) and the back surface (11c) of the insert pin (11) is provided with recesses (16, 17), and among the inner surfaces (25a, 25b, 25c, 25d) that constitute the insert pin hole (25) of the box (21), at least one of the front side surface (25a) and the back side surface (25b) that face the front surface (11b) and the back surface (11c) of the insert pin (11) is provided with protrusions (26, 27) that can engage with the recesses (16, 17), a slide fastener characterized in that, when the side on which the first fastener stringer (30A) is arranged is defined as a first side (L) in the left-right direction and the side on which the second fastener stringer (30B) is arranged is defined as a second side (R), the convex portions (26, 27) are inclined toward the first side (L) in the left-right direction as they extend downward (DN), and a sloping surface (29) is provided on a side surface (25c) on the second side (R) in the left-right direction of the inner surfaces (25a, 25b, 25c, 25d) constituting the insert pin hole (25) of the box (21) that is inclined downward toward the first side (L) in the left-right direction.[2] The slide fastener according to [1], wherein when the insert pin (11) is inserted into the insert pin hole (25), the insert pin (11) abuts against the inclined surface (29), thereby applying a rotational moment to the insert pin (11) in a direction that reduces the insertion angle (θ), and the insert pin (11) rotated by the rotational moment presses against the tapered surface (45a) of the guide post (45) of the slider (40), pushing the slider (40) upward. [3] The slide fastener according to [1] or [2], wherein an inclination angle (α2) of the convex portions (26, 27) relative to the vertical direction and an inclination angle (α1) of the inclined surface (29) of the insert pin hole (25) relative to the vertical direction are the same. [4] A slide fastener according to any one of [1] to [3], wherein the recesses (16, 17) are provided on the front surface (11b) and the back surface (11c) of the insert pin (11), respectively, and the protrusions (26, 27) are provided on the front side surface (25a) and the back side surface (25b) of the insert pin hole (25) of the box (21), respectively. [5] A slide fastener according to any one of [1] to [4], wherein the protrusions (26, 27) are located between the upper end and the lower end of the inclined surface (29) in the vertical direction. [6] A slide fastener according to any one of [1] to [5], wherein the side surface (11d) of the first side (L) at the lower end of the insert pin (11) is inclined toward the second side (R) as it extends downward (DN).[7] A method for manufacturing a box (21) of a separable bottom end stop (1) for a slide fastener, wherein the box (21) is provided with convex portions (26, 27) on at least one of the front side surface (25a) and the back side surface (25b) of the inner surface (25a, 25b) of an insert pin hole (25) through which an insert pin (11) can be inserted and removed, and when the side on which the insert pin (11) is arranged in the left-right direction is defined as a first side (L) and the side on which the box (21) is arranged is defined as a second side (R), the convex portions (26, 27) are inclined downward toward the first side (L) in the left-right direction, and an inclined surface (29) is provided on the side surface (25c) on the second side in the left-right direction of the inner surfaces (25a, 25b, 25c, 25d) constituting the insert pin hole (25) of the box (21) that is inclined downward toward the first side (L) in the left-right direction, The box (21) is obtained by injection molding using a fixed mold (5), a movable mold provided so as to be reciprocable in the front-to-back direction relative to the fixed mold (5), and first and second slides (7, 8) provided so as to be reciprocable in the up-down direction relative to the fixed mold (5), wherein a first recess (26x) provided in the first slide (7) and a second recess (26y) provided in the second slide (8) are butted together to form a convex portion forming portion (26z) for forming the convex portions (26, 27), the first slide (7) has an inclined surface forming portion (29x) for forming the inclined surface (29), the first slide (7) is reciprocable in a direction inclined with respect to the up-down direction at an inclination angle (α3) that is the same as the inclination angle (α1) of the inclined surface (29), and the second slide (8) is reciprocable in a direction parallel to the up-down direction. A method for manufacturing a box for a separable bottom end stop for a slide fastener.[8] The first slide (7) and the second slide (8) have a first mating surface (25yc) and a second mating surface (25zc) that are mated in the left-right direction, the first mating surface (25yc) and the second mating surface (25zc) are inclined toward a first side (L) in the left-right direction as they extend downward, and an inclination angle (β) of the first mating surface (25yc) and the second mating surface (25zc) with respect to the up-down direction is larger than an inclination angle (α3) of the first slide (7) in the reciprocating direction. A method for manufacturing a box for a separable bottom end stop for a slide fastener according to [7]. [9] A method for manufacturing a box for a separable bottom end stop for a slide fastener according to [7] or [8], wherein the first slide (7) and the second slide (8) have first and second abutting surfaces (73a) and (83a) that abut against each other in the up-down direction, and the first and second abutting surfaces (73a) and (83a) are inclined upward as they approach the first side (L) in the left-right direction.

[10] A method for manufacturing a box for a separable bottom end stop for a slide fastener according to any one of [7] to [9], wherein the first slide (7) and the second slide (8) have first and second mold abutting surfaces (71a) and (81a) that abut against the movable mold when the molds are closed, and the components of the normals (71b, 81b) of the first and second mold abutting surfaces (71a) and (81a) only have components in the front-to-back direction and the up-down direction, and do not have a component in the left-to-right direction.

[0140] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above-described embodiments may be combined in any manner without departing from the spirit of the invention.

[0141] 1 Separable fitting tool 5 Fixed mold 7 First slide 8 Second slide 10 First separating fitting part 11 Insert pin 11a Projection 11b Front surface 11c Back surface 11d Left side surface 11e Locking groove 11f Right side surface 16 Front side recess (recess) 16a Left side opening 16b Right side opening 16c Parallel surface 16d Upper inclined surface 16e Lower inclined surface 17 Back side recess (recess) 17a Left side opening 17b Right side opening 17c Parallel surface 17d Upper inclined surface 17e Lower inclined surface 20 Second separable fitting part 21 Box 21a Box body 21ax Box body recessed part 21b Box bar 21bx Box bar recess 21d Locking portion 22 Plane 22x Plane forming portion 25 Insert pin hole 25a Front side surface (inner surface) 25b Back side surface (inner surface) 25c Right side surface (inner surface) 25d Left side surface (inner surface) 25x Insert pin hole convex portion 25y Second side partial convex portion 25ya First base portion 25yb First tip portion 25yc First rubbing surface 25z First side partial convex portion 25zc Second rubbing surface 26 Front side convex portion (convex portion) 26a Upper inclined surface 26b Lower inclined surface 26c Parallel surface 26d Left side surface 26e Right side surface 26x First recess 26y Second recess 26z Front side convex portion forming portion (convex portion forming portion) 27 Back side convex portion (convex portion) 27a Upper inclined surface 27b Lower inclined surface 27c Parallel surface 27d Left side surface 27e Right side surface 29 Inclined surface 29a Upper flat surface 29b Lower flat surface 29c Vertical center portion 29x Inclined surface forming portion 30A First fastener stringer 30B Second fastener stringer 31a First tape 31b Second tape 32 Element 32A First element 33 Top stop 40 Slider 41 Slider body 42 Pull tab 43 Front wing plate 43a Raised portion 44 Rear wing plate 44a Raised portion 45 Guide post 45a Tapered surface 46 Pull tab holding portion 47 Element guide path 53 Upper and lower extension walls 54 Front body wall 55 Rear body wall 56 Joining wall 56a Groove closing portion 56b Hole closing portion 56s Joining wall space portion 57 Groove wall 61 Tape groove 63 Slide hole 63a Left side wall 63b Right side wall 63x Slide hole convex portion 71 First base portion 71a First die abutment surface 71b Normal line 72 First slide main body portion 73 First side surface forming portion 73a First abutting surface 81 Second base portion81a Second die contact surface 81b Normal line 82 Second slide main body portion 83 Second side surface forming portion 83a Second abutting surface 91 Cavity 92 Gate 93 Runner 100 Slide fastener

Claims

1. A slide fastener (100) comprising a pair of left and right first and second zipper stringers (30A, 30B), at least one slider (40) for opening and closing the space between the first and second zipper stringers (30A, 30B), and a separable bottom end stop (1) provided at the lower end of the first and second zipper stringers (30A, 30B), wherein the separable bottom end stop (1) comprises a first separable insert portion (10) provided on the first zipper stringer (30A), and a second separable insert portion (20) provided on the second zipper stringer (30B) and capable of connecting and disconnecting to the first separable insert portion (10), and the first separable insert portion (10) includes an insert pin (11) provided on the inner edge side of the first zipper stringer (30A) in the width direction, The second separable inserting portion (20) includes a box (21) provided on the widthwise inner edge side of the second fastener stringer (30B), the box (21) has an insert pin hole (25) that opens upward (UP) and allows the insert pin (11) to be inserted and removed in the longitudinal direction, at least one of the front surface (11b) and the back surface (11c) of the insert pin (11) is provided with recesses (16, 17), and among the inner surfaces (25a, 25b, 25c, 25d) that constitute the insert pin hole (25) of the box (21), at least one of the front side surface (25a) and the back side surface (25b) that face the front surface (11b) and the back surface (11c) of the insert pin (11) is provided with protrusions (26, 27) that can engage with the recesses (16, 17), a slide fastener characterized in that, when the side on which the first fastener stringer (30A) is arranged is defined as a first side (L) in the left-right direction and the side on which the second fastener stringer (30B) is arranged is defined as a second side (R), the convex portions (26, 27) are inclined toward the first side (L) in the left-right direction as they extend downward (DN), and a sloping surface (29) is provided on a side surface (25c) on the second side (R) in the left-right direction of the inner surfaces (25a, 25b, 25c, 25d) constituting the insert pin hole (25) of the box (21) that is inclined downward toward the first side (L) in the left-right direction.

2. A slide fastener according to claim 1, wherein when the insert pin (11) is inserted into the insert pin hole (25), the insert pin (11) comes into contact with the inclined surface (29), thereby applying a rotational moment to the insert pin (11) in a direction that reduces the insertion angle (θ), and the insert pin (11) rotated by the rotational moment presses against the tapered surface (45a) of the guide post (45) of the slider (40), pushing the slider (40) upward.

3. A slide fastener according to claim 1 or 2, wherein the angle of inclination (α2) of the convex portions (26, 27) relative to the vertical direction is the same as the angle of inclination (α1) of the inclined surface (29) of the insert pin hole (25) relative to the vertical direction.

4. A slide fastener according to any one of claims 1 to 3, wherein the recesses (16, 17) are provided on the front surface (11b) and the back surface (11c) of the insert pin (11), respectively, and the protrusions (26, 27) are provided on the front side surface (25a) and the back side surface (25b) of the insert pin hole (25) of the box (21), respectively.

5. A slide fastener according to any one of claims 1 to 4, wherein the convex portions (26, 27) are positioned between the upper and lower ends of the inclined surface (29) in the vertical direction.

6. A slide fastener according to any one of claims 1 to 5, wherein the side surface (11d) of the first side (L) of the lower end of the insert pin (11) is inclined toward the second side (R) as it extends downward (DN).

7. A method for manufacturing a box (21) for a separable bottom end stop (1) for a slide fastener, wherein the box (21) has convex portions (26, 27) on at least one of the front side (25a) and the back side (25b) of the inner surface (25a, 25b) of an insert pin hole (25) through which an insert pin (11) can be inserted and removed, and when the side on which the insert pin (11) is arranged in the left-right direction is defined as a first side (L) and the side on which the box (21) is arranged is defined as a second side (R), the convex portions (26, 27) are inclined downward toward the first side (L) in the left-right direction, and an inclined surface (29) is provided on the side surface (25c) on the second side in the left-right direction of the inner surfaces (25a, 25b, 25c, 25d) constituting the insert pin hole (25) of the box (21), which is inclined downward toward the first side (L) in the left-right direction, The box (21) is obtained by injection molding using a fixed mold (5), a movable mold provided so as to be reciprocable in the front-to-back direction relative to the fixed mold (5), and first and second slides (7, 8) provided so as to be reciprocable in the up-down direction relative to the fixed mold (5), wherein a first recess (26x) provided in the first slide (7) and a second recess (26y) provided in the second slide (8) are butted together to form a convex portion forming portion (26z) for forming the convex portions (26, 27), the first slide (7) has an inclined surface forming portion (29x) for forming the inclined surface (29), the first slide (7) is reciprocable in a direction inclined with respect to the up-down direction at an inclination angle (α3) that is the same as the inclination angle (α1) of the inclined surface (29), and the second slide (8) is reciprocable in a direction parallel to the up-down direction. A method for manufacturing a box for a separable bottom end stop for a slide fastener.

8. A method for manufacturing a box for a separable bottom end stop for a slide fastener as set forth in claim 7, wherein the first slide (7) and the second slide (8) have a first mating surface (25yc) and a second mating surface (25zc) that rub against each other in the left-right direction, the first mating surface (25yc) and the second mating surface (25zc) are inclined toward a first side (L) in the left-right direction as they extend downward, and the inclination angle (β) of the first mating surface (25yc) and the second mating surface (25zc) with respect to the up-down direction is greater than the inclination angle (α3) of the first slide (7) in the reciprocating direction.

9. A method for manufacturing a box for a separable bottom end stop for a slide fastener as described in claim 7 or 8, wherein the first slide (7) and the second slide (8) have a first butting surface (73a) and a second butting surface (83a) that butt together in the vertical direction, and the first butting surface (73a) and the second butting surface (83a) are inclined upward as they approach the first side (L) in the left-right direction.

10. A method for manufacturing a box for a separable bottom end stop for a slide fastener according to any one of claims 7 to 9, wherein the first slide (7) and the second slide (8) have a first mold contact surface (71a) and a second mold contact surface (81a) that come into contact with the movable mold when the mold is closed, and the components of the normals (71b, 81b) of the first mold contact surface (71a) and the second mold contact surface (81a) only have components in the front-to-back and up-down directions, and do not have components in the left-to-right direction.

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