Sliders and slide fasteners

Abstract

In one fastener stringer (4b), a slider (5) is rotated so that a connection column (53) of the slider (5) is away from a fastener element (3b) provided in the fastener stringer (4b), and rotation of the slider (5) is stopped by collision between the fastener element (3b) and a flange part (54, 55) of the slider (5). At this time, the surface (26b) opposite to a tape and extending toward the flange part (54, 55) forms an angle of 45° or less with respect to the center line (X5) of the slider (5).

Description

[Technical Field]

[0001] The present disclosure relates to a slider and a slide fastener. [Background technology]

[0002] Patent Document 1 discloses providing a wedge-shaped protrusion on the upper wing of the slider to spread the edge of the fastener tape. Patent Document 2 also discloses a similar structure in Figures 4 and 5. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3379004 [Patent Document 2] Patent No. 4072951 Summary of the Invention [Problem to be solved by the invention]

[0004] The slider of a slide fastener may be moved along the fastener element on one of the fastener stringers (hereinafter referred to as "one stringer") for a purpose other than opening and closing the pair of fastener stringers. For example, when sewing a slide fastener to clothing, etc., the slider may get in the way of the sewing operation, so the slider is moved along the fastener element on one stringer. Also, the slider may be moved along the fastener element on one stringer simply for fun or to kill time.

[0005] The structure of the slider, particularly the structure for defining the movement trajectories of the fastener tape and fastener elements (for example, the wedge-shaped protrusions in Patent Document 1), is premised on the slider being moved to open and close a pair of fastener stringers. The inventors of the present application have newly discovered that a slider designed on this premise may not fit well when moved along the fastener elements on one stringer. [Means for solving the problem]

[0006] A slide fastener according to one aspect of the present disclosure is a slide fastener in which a pair of fastener stringers having a fastener tape and fastener elements provided along one side edge of the fastener tape are closed by advancing a slider and opened by reversing the slider, The slider has an upper blade, a lower blade, a connecting post connecting these blades, and a flange portion provided on the upper blade or the lower blade, The upper blade is provided with a protrusion extending rearward to be inserted between the tape facing surfaces of the pair of fastener tapes, In one fastener stringer of a pair of fastener stringers, when the slider is rotated so that the connecting post moves away from the fastener element provided there, and the slider stops rotating due to collision between the fastener element and the flange portion, the tape-opposing surface extending toward the flange portion forms an angle of 45° or less with the center line of the slider.

[0007] In some embodiments, the protrusion has a tapered rear end portion that narrows rearward, and the angle formed between the center line of the slider and the side surface of the rear end portion is 45° or greater.

[0008] In some embodiments, when the length of the protrusion is d1 and the distance between the connecting post and the rear end of the slider is d2, the relationship d1 / d2≦0.7 is satisfied.

[0009] In some embodiments, when the slider is pulled rearward in a state where the slider has stopped rotating on one of the fastener stringers as described above, the side surface of the rear end of the protrusion slides on the tape-facing surface of the fastener tape of the one of the fastener stringers.

[0010] In some embodiments, the lower vane has a partition extending rearward from the connecting post so as to at least partially oppose the ridge.

[0011] In some embodiments, the fastener tape has a tape base and a waterproof layer provided on the tape base, and the slider includes a locking claw whose tip can protrude into an element passage of the slider through a claw hole provided in the protrusion.

[0012] A slide fastener according to another aspect of the present disclosure is a slide fastener in which a pair of fastener stringers having a fastener tape and fastener elements provided along one side edge of the fastener tape are closed by advancing a slider and opened by reversing the slider, The slider has an upper blade, a lower blade, and connecting posts connecting these blades, and a laminated portion of the fastener tape and the fastener element is disposed between the upper blade and the lower blade, and the upper surface of the fastener tape can contact the upper blade, and the fastener element provided on the lower surface of the fastener tape can contact the lower blade, The upper blade is provided with a protrusion extending rearward to be inserted between the tape facing surfaces of the pair of fastener tapes, The protrusion has a length that prevents the laminated portion from entering between the protrusion and the lower wing plate when the slider is rotated and pulled rearward so that the connecting post moves away from the fastener element provided on one fastener stringer of the pair of fastener stringers.

[0013] In some embodiments, when the length of the protrusion is d1 and the distance between the connecting post and the rear end of the slider is d2, d1 / d2≦0.7 Satisfy.

[0014] In some embodiments, the protrusion has a tapered rear end portion that narrows rearward, and the angle formed between the center line of the slider and the side surface of the rear end portion is 45° or greater.

[0015] In some embodiments, the slider is rotated until a flange portion of the slider contacts a fastener element of one fastener stringer.

[0016] A slider according to yet another aspect of the present disclosure is a slider for a slide fastener, comprising an upper blade, a lower blade, and a connecting post connecting these blades, The upper blade is provided with a protrusion extending rearward to be inserted between the tape facing surfaces of a pair of fastener tapes to be opened and closed by the slider, When the length of the protrusion is d1 and the distance between the connecting post and the rear end of the slider is d2, d1 / d2≦0.7 Satisfied, The protrusion has a tapered rear end portion that narrows toward the rear, and the angle formed between the center line of the slider and the side surface of the rear end portion is 45° or more.

[0017] In some embodiments, the slider includes a locking pawl provided such that the tip of the pawl can protrude into the element passage of the slider through a pawl hole provided in the protrusion. [Effects of the Invention]

[0018] One aspect of the present disclosure facilitates providing a slider that conforms well when moved along a fastener element on a single stringer. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a top view of a slide fastener according to one embodiment of the present disclosure. [Figure 2] FIG. 2 is a bottom view of a slide fastener according to one embodiment of the present disclosure. [Figure 3] FIG. 2 is a schematic cross-sectional view of a closed fastener stringer. [Figure 4] FIG. 10 is a top view showing a state in which the slider is placed at an intermediate position along the fastener element on one stringer. [Figure 5] FIG. 2 is a schematic cross-sectional view of a slider. [Figure 6] FIG. 2 is a schematic diagram showing the inner surface of the upper blade of the slider. [Figure 7] FIG. 2 is a schematic diagram showing the inner surface of the lower blade of the slider. [Figure 8] 1 is a reference diagram for explaining the technical effect of shortening the protrusions on the upper blade of the slider, in which the position and trajectory of the tape-facing surface are indicated by dashed lines. [Figure 9] FIG. 1 is a reference diagram relating to the slider shown in FIG. 2 of Patent Document 1. [Figure 10] FIG. 1 is a schematic diagram showing the schematic configuration of a non-limiting example of a slider with an automatic stop function. [Figure 11] FIG. 10 is a schematic diagram showing a case where the fastener tape is a water-stopping tape. DETAILED DESCRIPTION OF THE INVENTION

[0020] Various embodiments and features will be described below with reference to Figures 1 to 11. Those skilled in the art will be able to combine the various embodiments and / or features without the need for excessive explanation, and will also be able to understand the synergistic effects of such combinations. Duplicate descriptions between embodiments will generally be omitted. The reference drawings are primarily intended to describe the invention and are simplified for ease of illustration. Each feature is not only applicable to the slide fastener and slider disclosed in this application, but is understood as a universal feature applicable to various other slide fasteners and sliders not disclosed in this specification.

[0021] As shown in FIG. 1, the slide fastener 1 has a pair of left and right fastener stringers 4a, 4b. These stringers 4a, 4b are closed by the forward movement of the slider 5 and opened by the backward movement of the slider 5. Each stringer 4a, 4b has a fastener tape 2a, 2b and a fastener element 3a, 3b provided on one side edge thereof. In this specification, the front-to-rear direction is understood based on the movement of the slider 5. The up-to-down direction is perpendicular to the front-to-rear direction and is also perpendicular to the tape surface of the fastener tape (the surface that determines the tape thickness). The left-to-right direction is perpendicular to the front-to-rear direction and the up-to-down direction.

[0022] The fastener tapes 2a, 2b are flexible single-layer or multi-layer thin materials whose thickness is determined by the upper and lower tape surfaces 21, 22 (see FIG. 3). The fastener tapes may include a tape base fabric having a knitted structure, a woven structure, or a mixture of these. A knitted structure has higher elasticity or flexibility than a woven structure, and is expected to move more easily (for example, locally) in accordance with the movement of the fastener elements provided on the fastener tape.

[0023] The fastener elements 3a, 3b are coil-shaped elements formed by spirally winding monofilament, and are sewn to the tape surfaces 22 of the fastener tapes 2a, 2b with attachment thread. When the slide fastener 1 is closed, the fastener elements 3a, 3b are covered and concealed from above by the fastener tapes 2a, 2b (i.e., they are not visible or are difficult to see by the human eye). Note that the degree to which the fastener elements 3a, 3b are concealed by the fastener tapes 2a, 2b can be adjusted. Also, as shown in FIG. 2, when the slide fastener 1 is viewed from below, the fastener elements 3a, 3b are not concealed at all by the fastener tapes 2a, 2b. The fastener elements 3a, 3b are not limited to coil-shaped elements, and may also be formed as resin or metal elements.

[0024] The coiled element is composed of a series of unit structures each consisting of an upper leg 31, a lower leg 32, a head 33, and an inverted portion 34 (see Figure 3). The upper leg 31 is provided in contact with the tape surface 22. The lower leg 32 is provided spaced apart from the tape surface 22. The head 33 extends in the up-down direction to connect the upper leg 31 and the lower leg 32, and has a filament width that is wider in the front-to-back direction than the filament widths of the upper leg 31 and the lower leg 32. The inverted portion 34 extends to connect the upper leg 31 and the lower leg 32 in adjacent unit structures. It is optional whether or not to provide a core cord within the spiral structure of the coiled element.

[0025] The slide fastener 1 further has front stops 8a, 8b provided at the front ends of the fastener elements 3a, 3b to prevent the slider 5 from moving forward, and a rear stop 8c that allows the fastener stringers 4a, 4b to open and separate. When the fastener stringers 4a, 4b are separated, the slider 5 can move forward and backward along the fastener element 3b provided on one of the fastener stringers 4b (hereinafter referred to as the "one-stringer 4b"), as shown in Figure 4. The forward and backward movement of the slider 5 on the one stringer 4b does not cause the fastener stringers 4a, 4b to open or close, but may be performed to ensure ease of sewing when sewing the slide fastener 1 to clothing, or simply as a way to kill time.

[0026] The center line X5 of the slider 5 is inclined with respect to the axis X2 parallel to the longitudinal direction (front-rear direction) of one stringer 4b. When the slider 5 is pulled rearward on one stringer 4b, the slider 5 may be further inclined with respect to the other stringer 4b, i.e., the angle between the axis X2 and the center line X5 may increase. As mentioned at the beginning, the slider structure, in general, and the structure for defining the movement trajectory of the fastener tape and fastener element is premised on the slider being moved to open and close a pair of fastener stringers. The movement of the slider 5 on one stringer 4b is, so to speak, unexpected, and the slider 5 may not be well adapted to this.

[0027] The slider 5 will be described in more detail with reference to FIGS. 5 to 9. The slider 5 includes an upper blade 51, a lower blade 52, a connecting post 53 connecting the blades 51 and 52, a flange 54 provided on the upper blade 51, a flange 55 provided on the lower blade 52, a pull tab attachment portion 58 provided on the upper blade 51, and a pull tab 59 attached to the pull tab attachment portion 58 (see FIGS. 1 and 4). The slider 5 may be made of any material, such as metal, resin, or ceramic. The slider 5 may be manufactured by assembling a locking claw 60 (and, optionally, a leaf spring 61 and a cap 62) (see FIG. 10) to a slider body made up of the upper blade 51, the lower blade 52, the connecting post 53, the flange 54, and the flange 55.

[0028] The upper blade 51, the lower blade 52, and the connecting rod 53 form a Y-shaped element passage. The connecting rod 53 extends vertically to separate the connected fastener elements 3a, 3b. The connecting rod 53 has a tapered rear end 53t that narrows toward the rear. The flanges 54, 55 are provided so that the individual or connected fastener elements 3a, 3b move along an intended trajectory in the element passage. The fastener tapes 2a, 2b and the stacked portions 9a, 9b of the fastener elements 3a, 3b (see FIG. 3) are disposed between the upper blade 51 and the lower blade 52. The tape surfaces 21 of the fastener tapes 2a, 2b can contact the upper blade 51 (its inner surface) and the flange 54. The tape surfaces 22 of the fastener tapes 2a, 2b can contact the flange 55. The fastener elements 3a, 3b can contact the lower blade 52 (its inner surface) and the flange 55.

[0029] The upper blade 51 is provided with a protrusion 56 extending rearward from the connecting post 53 so as to be inserted between the tape-opposing surfaces 26a, 26b (see FIG. 3) of the pair of fastener tapes 2a, 2b. The protrusion 56 has a tapered rear end 56e that narrows toward the rear. The left and right side surfaces 56a, 56b of the rear end 56e gradually approach each other toward the rear. The side surface 56a contacts the tape-opposing surface 26a, and the side surface 56b contacts the tape-opposing surface 26b. The side surfaces 56a, 56b form a peak 56c of the rear end 56e. When the slider 5 is pulled rearward, the protrusion 56 enters between the tape-opposing surfaces 26a, 26b of the fastener tapes 2a, 2b, facilitating smooth release of the fastener elements 3a, 3b by the connecting post 53. The tape-opposing surfaces 26a, 26b are side surfaces of the fastener tapes 2a, 2b, and are provided to face each other when the fastener stringers 4a, 4b are opened or closed by the slider 5.

[0030] The upper blade 51 is provided with a shallow groove 51j extending rearward from the protrusion 56, providing an escape space for the fastener tapes 2a, 2b that should be separated by the protrusion 56. The upper blade 51 is provided with an element retainer 51u, which suppresses displacement of the fastener elements 3a, 3b within the slider 5. The lower blade 52 is provided with a convex partition 52j extending rearward from the connecting post 53 so as to face the protrusion 56, dividing the movement path of the fastener elements 3a, 3b. If the partition 52j is provided, the escape space of the stacked portion 9b may be narrowed when the slider 5 moves on one stringer 4b. If the partition 52j is omitted, the stability of opening and closing the fastener stringers 4a, 4b by the slider 5 may be reduced.

[0031] Figure 8 shows a state in which the slider 5 is rotated (counterclockwise as viewed from above (see the arrow in Figure 4)) so that the connecting post 53 moves away from the fastener element 3b provided on one stringer 4b shown in Figure 4, and the slider 5 stops rotating due to collision between the fastener element 3b and the left flange portion 55 (particularly the rear end of the flange). In Figure 8, the position and trajectory of the tape-opposing surface 26b are indicated by a dashed line.

[0032] In this embodiment, the tape-facing surface 26b extending toward the flange portion 54 (or the flange portion 55 if the flange portion 54 is not present) forms an angle of 45° or less (e.g., 44°, 43°, 42°, 41°, 40°, (intermediate values ​​omitted), 15°) with respect to the center line X5 of the slider 5 (see θ4). Additionally or alternatively, in some cases, the side surface 56b of the rear end portion 56e of the protrusion 56 forms an angle of 45° or more (e.g., 46°, 47°, 48°, 49°, 50°, (intermediate values ​​omitted), 75°) with respect to the center line X5 of the slider 5 (see θ2). θ2 is 90° in some cases. In such a case, the slider 5 is well adapted to be moved along the fastener element 3b on one stringer 4b. For example, when the slider 5 rotates relative to one stringer 4b and is pulled rearward as described above, the fastener tape 2b rides up onto the protrusion 56 (i.e., the laminated portion 9b enters between the protrusion 56 and the lower blade 52), preventing or obstructing the backward movement of the slider 5. The side surface 56a of the rear end portion 56e of the protrusion 56, like the side surface 56b, forms an angle of 45° or less with the center line X5 of the slider 5, but this is not necessarily limited to this. Note that when the slider 5 rotates relative to one stringer 4b and is pulled rearward as described above, the side surface 56b of the rear end portion 56e of the protrusion 56 slides on the tape-opposing surface 26b of the fastener tape 2b of the one stringer 4b.

[0033] Normally, by extending the protrusion 56 farther rearward, the fastener tapes 2a, 2b can be separated in advance in the left-right direction at a position farther from the connecting post 53, thereby promoting stable opening and closing of the fastener stringers 4a, 4b. In this embodiment, the protrusion 56 is not extended far rearward, but is shortened in length. In short, the protrusion 56 has a length d1 such that the laminated portion 9b does not enter between the protrusion 56 and the lower blade 52 when the slider 5 is pulled rearward in a rotated state so that the connecting post 53 separates from the fastener element 3b provided on one fastener stringer 4b of the pair of fastener stringers 4a, 4b. This prevents the fastener tape 2b from riding up onto the protrusion 56 (i.e., the laminated portion 9b from entering between the protrusion 56 and the lower blade 52), thereby preventing or obstructing the backward movement of the slider 5. When the protrusion 56 extends rearward from the connecting post 53, the length d1 of the protrusion 56 is equal to the (maximum) distance between the connecting post 53 and the rear end of the protrusion 56.

[0034] In some cases, when the length of the rib 56 is d1 and the distance between the connecting post 53 and the rear end of the slider 5 is d2, d1 / d2≦0.7 is satisfied. In some cases, d1 / d2≦0.65 or d1 / d2≦0.6 is satisfied. By shortening the rib 56, it is expected that the condition regarding the angle between the tape-facing surface 26b and the center line X5 of the slider 5 will be more easily satisfied.

[0035] In a configuration in which the claw holes 51n are provided on the ribs 56 of the slider 5, when the fastener tape 2b rides up on the ribs 56 (i.e., when the laminated portion 9b enters between the ribs 56 and the lower blade 52), the fastener tape 2b is pressed into the claw holes 51n, which may cause the tape surface 21 of the fastener tape 2b to be scraped and damaged. By satisfying the condition regarding the angle between the tape-opposing surface 26b and the center line X5 of the slider 5, such disadvantages can be avoided or suppressed.

[0036] To more clearly understand the above-mentioned features, an explanation will be made with reference to Fig. 9. Fig. 9 was created with reference to Fig. 2 of Patent Document 1. Like Fig. 8, Fig. 9 shows a state in which the slider 5 is rotated (see the arrow in Fig. 4) in one stringer 4b so that the connecting post 53 moves away from the fastener element 3b provided thereon, and the slider 5 stops rotating due to collision between the fastener element 3b and the flange portion 55 (particularly the rear end portion of the flange).

[0037] 9, the tape-facing surface 26b extending toward the flange portion 54 (or the flange portion 55 if the flange portion 54 is not present) forms an angle of 45° or more with respect to the center line X5 of the slider 5 (see θ4'). Similarly, the side surface 56b of the rear end portion 56e of the ridge 56 forms an angle of 45° or less with respect to the center line X5 of the slider 5 (see θ2'). In this case, when the slider 5 rotates relative to one stringer 4b and is pulled rearward as described above, the fastener tape 2b may ride up onto the ridge 56 (i.e., the laminated portion 9b may enter between the ridge 56 and the lower wing 52), which may prevent or obstruct the backward movement of the slider 5.

[0038] The slider 5 may have an automatic stop function. In this case, the slider 5 includes a locking pawl 60, the pawl tip 60t of which can protrude into the element passage of the slider 5 through a pawl hole 51n formed in the upper blade 51 (e.g., the protrusion 56). The locking pawl 60 is elastically displaceable between a locked position (locked posture) and an unlocked position (unlocked posture) in response to the operation of the pull tab 59. For example, as shown in FIG. 10 , the slider 5 may include the locking pawl 60, a leaf spring 61 for biasing the locking pawl 60, and a cap 62 for housing these components. The locking pawl 60 has a pawl tip 60t that can protrude from the pawl hole 51n into the element passage. The operating rod 59k of the pull tab 59 moves the pawl tip 60t of the locking pawl 60 to the unlocked position where it does not protrude from the pawl hole 51n, thereby releasing the lock. When the pull tab 59 is released from the user's hand, the locking pawl 60 is biased by the leaf spring 61 and returns to the locked position. Various types of locking claws 60 are known, and should not be limited to the illustrated example. For example, in another case, the locking claws 60 are formed by bending a leaf spring, and are fixed to the upper blade 51 so that the claw ends 60t of the locking claws 60 protrude from the claw holes 51n.

[0039] FIG. 11 shows a case where the fastener tapes 2a, 2b are made up of multiple layers. The fastener tapes 2a, 2b have a tape base fabric 2m and a waterproof layer 2n provided on the tape base fabric 2m. The tape base fabric 2m may have a knitted structure, a woven structure, or a structure in which these are mixed. The waterproof layer 2n is a resin layer (e.g., a transparent resin layer) formed on the tape base fabric 2m by coating or lamination. The waterproof layer 2n is a resin layer such as polyurethane, and has lower flexibility than the tape base fabric 2m.

[0040] In a configuration in which the protrusion 56 of the slider 5 has the claw hole 51n, if the fastener tape 2b rides up onto the protrusion 56 (i.e., if the laminated portion 9b enters between the protrusion 56 and the lower blade 52), the fastener tape 2b may be pressed into the claw hole 51n, causing the tape surface 21 of the fastener tape 2b to be scraped and damaged. If the fastener tapes 2a, 2b have a waterproof layer 2n, the waterproof layer 2n may be scraped and damaged, reducing the commercial value of the slide fastener 1 and the garment to which it is attached. As described above, such an outcome can be avoided or suppressed by satisfying the conditions regarding the angle between the tape-opposing surface 26b and the center line X5 of the slider 5.

[0041] In light of the above teachings, those skilled in the art can make various modifications to the embodiments. The reference numerals included in the claims are for reference purposes only and should not be used to limit the scope of the claims. [Explanation of symbols]

[0042] 2a, 2b Zipper tape 3a, 3b Fastener element 4a, 4b Zipper stringer 5 Slider 51 Upper wing plate 52 Lower wing plate 53 Connecting column 56 protrusion 56e rear end 56a,56b side

Claims

1. A slide fastener (1) in which a pair of fastener stringers (4a, 4b) having fastener tapes (2a, 2b) and fastener elements (3a, 3b) provided along one side edge of the fastener tapes (2a, 2b) are closed by advancing a slider (5) and opened by reversing the slider (5), The slider (5) has an upper blade (51), a lower blade (52), a connecting column (53) connecting these blades (51, 52), and a flange portion (54, 55) provided on the upper blade (51) or the lower blade (52), The upper blade (51) is provided with a protrusion (56) extending rearward from the connecting post (53) so as to be inserted between the tape opposing surfaces (26a, 26b) of the pair of fastener tapes (2a, 2b); a slide fastener in which, when the slider (5) is attached to only one fastener stringer (4b) of the pair of fastener stringers (4a, 4b), the slider (5) is rotated so that the connecting post (53) moves away from the fastener element (3b) provided on the one fastener stringer (4b), and the rotation of the slider (5) stops due to collision between the fastener element (3b) and the flange portions (54, 55), the tape-opposing surface (26b), which moves away from the rear end (56e) of the protrusion (56) and extends obliquely rearward toward the flange portions (54, 55) in a plane perpendicular to the up-down direction, forms an acute angle of 45° or less and 15° or more with a center line (X5) of the slider (5).

2. The distance between the connecting post (53) and the rear end of the protrusion (56) is d 1 The distance between the connecting post (53) and the rear end of the slider (5) is d 2 When d 1 / d 2 ≦0.7 2. The slide fastener according to claim 1, wherein the following is satisfied:

3. 3. The slide fastener according to claim 1 or 2, characterized in that, when the slider (5) is pulled rearward in a state in which rotation of the slider (5) is stopped as described above in the one fastener stringer (4b), the side surface (56b) of the rear end portion (56e) of the protrusion (56) slides on the tape-opposing surface (26b) of the fastener tape (2b) of the one fastener stringer (4b).

4. A slide fastener according to any one of claims 1 to 3, characterized in that the lower blade (52) has a partition portion (52j) extending rearward from the connecting post (53) so as to at least partially face the protrusion (56).

5. The fastener tape (2a, 2b) has a tape base fabric (2m) and a waterproof layer (2n) provided on the tape base fabric (2m), A slide fastener according to any one of claims 1 to 4, characterized in that the slider (5) includes a locking claw (60) whose claw end (60t) is capable of protruding into an element passage of the slider (5) through a claw hole (51n) provided in the protrusion (56).

6. A slider (5) for a slide fastener, comprising an upper blade (51), a lower blade (52), and a connecting post (53) connecting these blades (51, 52), The upper blade (51) is provided with a protrusion (56) extending rearward from the connecting post (53) so as to be inserted between the tape opposing surfaces (26a, 26b) of a pair of fastener tapes (2a, 2b) to be opened and closed by the slider (5); The distance between the connecting post (53) and the rear end of the protrusion (56) is d 1 The distance between the connecting post (53) and the rear end of the slider (5) is d 2 When d 1 / d 2 ≦0.6 Satisfied, The protrusion (56) has a tapered rear end portion (56e) that narrows toward the rear, and the tapered rear end portion (56e) has a pair of side surfaces that are each inclined at a certain angle, In a plane perpendicular to the vertical direction, the acute angle formed by each of the pair of side surfaces of the rear end portion (56e) relative to the center line (X5) of the slider (5) is 45° or more and less than 90°.

7. The slider (5) according to claim 6, characterized in that the slider (5) includes a locking claw (60) whose claw end (60t) is capable of protruding into an element passage of the slider (5) through a claw hole (51n) formed in the protrusion (56).

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