Slide fastener

Abstract

To provide a slide fastener capable of suppressing wear of a fastener tape and preventing clogging of the fastener tape. [Solution] A slide fastener 10 comprises a pair of fastener tapes 12, each having a pair of coil elements 14 attached to opposing side edges 13, and a slider 30 through which the pair of coil elements 14 are inserted for engaging and separating the pair of coil elements 14. The slider 30 has upper and lower blades 31 and 32 arranged parallel to and spaced apart in the vertical direction, lower flanges 33b provided along the left and right side edges of the lower blade 32, and guide posts 34 connecting the upper and lower blades 31 and 32. Each of the pair of fastener tapes 12 comprises an overlapping portion 20 in which a first tape portion 21 and a second tape portion 22, which is narrower than the first tape portion 21, are overlapped. The second tape portion 22 faces the lower flange 33b, and the end opposite the opposing ends of the pair of fastener tapes in the left-right direction is the free end 23, and the length A of the free end of the second tape portion 22 widthwise outside the coil-shaped element 14 is less than 2.4 times the width B of the lower flange 33b.

Description

[Technical Field]

[0001] The present invention relates to a slide fastener. [Background technology]

[0002] A common slide fastener has a problem that the fastener tape wears out due to friction generated between the slider and the fastener tape when the slider is repeatedly slid over a long period of time. Specifically, since the fastener tape is sewn to the garment and also sewn to the element with a bonding thread, when the fastener tape comes into contact with the flange portion of the slider, the fastener tape tries to escape in the vertical direction, but is blocked by the other opposing flange portion, so it slides while remaining in contact with the flange portion.

[0003] In the slide fastener described in Patent Document 1, the fastener tape is woven in a single weave, and a portion woven in a hollow weave as a double weave is located at the ridge line between the upper surface and outer surface of the lower flange portion of the slider, thereby preventing wear of the fastener tape due to contact with the slider.

[0004] In addition, a slide fastener described in Patent Document 2 is known in which a thermoplastic film is adhered to the entire surface of one side of a paper or nonwoven tape, and the tape is folded back so that the film is on the outside, thereby forming an overlapping section that has at least the width of the slider and allowing smooth movement of the slider. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5795074 [Patent Document 2] Japanese Utility Model Application Publication No. 59-21208 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the slide fastener described in Patent Document 1, even if the fastener tape is a hollow weave located at the ridge of the lower flange, a lateral pulling force acts on the fastener tape, so when the slider is lifted upward to perform the opening and closing operation, the flange portion comes into strong contact with the tape, and there is a risk of wear due to repeated opening and closing operations.

[0007] Furthermore, in the slide fastener described in Patent Document 2, no upper limit is specified for the length of the overlapping portion, and if the overlapping portion is too long, it may get into the flange portion, causing the fastener tape to become clogged, which is a problem.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide a slide fastener that can suppress wear of the fastener tape and prevent the fastener tape from clogging. [Means for solving the problem]

[0009] The above object of the present invention is achieved by the following configuration. (1) a pair of fastener tapes having a pair of coil elements attached to opposite side edges thereof; a slider through which the pair of coil-shaped elements are inserted and which engages and disengages the pair of coil-shaped elements; A slide fastener comprising: The slider is An upper blade and a lower blade arranged parallel to each other and spaced apart in the vertical direction; Lower flanges provided along the left and right side edges of the lower blade, respectively; A guide post connecting the upper blade and the lower blade; and Each of the pair of fastener tapes includes an overlapping portion in which a first tape portion and a second tape portion having a width shorter than that of the first tape portion are overlapped with each other, the second tape portion faces the lower flange, and an end portion opposite to the opposing ends of the pair of fastener tapes in the left-right direction is a free end; The length of the free end of the second tape portion that is located widthwise outside the coil element is less than 2.4 times the width of the lower flange. Slide fastener. (2) The thread density in the second tape portion is higher than the thread density in the first tape portion. (1) A slide fastener as described above. (3) The second tape portion has a plain weave in a region facing the lower flange. (2) A slide fastener as described above. (4) The fastener tape has the overlapping portion formed of the first tape portion and the second tape portion by folding a tape material. (2) A slide fastener as described above. (5) The tape material has a twill weave across the folding position and in the areas of the first tape portion and the second tape portion where the coil element is sewn, The second tape portion has a plain weave in an area facing the lower flange. (4) A slide fastener as described above. (6) The length of the free end of the second tape portion that is located widthwise outside the coil element is 0.3 times or more the width of the lower flange. (1) A slide fastener as described above. (7) The second tape portion is in contact with the coiled element, and the first tape portion and the second tape portion are sewn to the coiled element, which is a reverse use specification. A slide fastener according to any one of (1) to (6). (8) The second tape portion has a plain weave in an area facing the lower flange. (1) A slide fastener as described above. [Effects of the Invention]

[0010] The slide fastener of the present invention can suppress wear of the fastener tape and prevent the fastener tape from clogging. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a surface view of a slide fastener according to an embodiment of the present invention; [Figure 2] FIG. 2 is a rear view of the slide fastener of FIG. [Figure 3] 3 is a cross-sectional view of the slide fastener shown in FIG. 1 taken along line III-III. [Figure 4] 3A and 3B are diagrams for explaining the weave structure of a tape material constituting the fastener tape. [Figure 5] 4 is a cross-sectional view corresponding to FIG. 3, showing a slide fastener according to a modified example. [Figure 6] FIG. 5 is a cross-sectional view corresponding to FIG. 3, showing a slide fastener according to another modified example. [Figure 7] FIG. 4 is a cross-sectional view corresponding to FIG. 3, showing a current slide fastener. [Figure 8] 10 is a graph showing the results of a durability test. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, each embodiment of the slide fastener according to the present invention will be described in detail with reference to the drawings. In the following description, with regard to the fastener tape and coiled element, the front side refers to the front side relative to the plane of FIG. 1, the back side refers to the rear side relative to the plane of FIG. 1, the upper side refers to the upper side relative to the plane of FIG. 1, the lower side refers to the lower side relative to the plane of FIG. 1, the left side refers to the left side relative to the plane of FIG. 1, and the right side refers to the right side relative to the plane of FIG. 1. With regard to the slider, the upper side refers to the front side relative to the plane of FIG. 1, the lower side refers to the rear side relative to the plane of FIG. 1, the front side refers to the upper side relative to the plane of FIG. 1, the rear side refers to the lower side relative to the plane of FIG. 1, the left side refers to the left side relative to the plane of FIG. 1, and the right side refers to the right side relative to the plane of FIG. 1. The left-right direction of the fastener tape and slider is also referred to as the width direction. The up-down direction of the fastener tape is also referred to as the length direction.

[0013] 1, the slide fastener 10 of this embodiment includes a fastener stringer 11 and at least one slider 30. The slide fastener 10 also includes known fasteners and separable end stoppers (not shown) at the top and bottom ends of the tape member as needed.

[0014] The fastener stringer 11 includes a pair of left and right fastener tapes 12 arranged parallel to each other in the left-right direction, and a pair of left and right coil elements 14 attached to opposing side edges 13 of the pair of left and right fastener tapes 12. By moving the slider 30 in the length direction of the fastener stringer 11, the pair of left and right coil elements 14 are engaged with and disengaged from each other.

[0015] In the slide fastener 10 of this embodiment, the coil elements 14 are attached to the lower surface (rear surface of the tape) of the fastener tape 12. Therefore, the slide fastener 10 is formed as a so-called reverse-use type slide fastener 10 having a configuration in which the coil elements 14 in an engaged state are difficult to see from the upper surface side of the slide fastener 10 when the slide fastener 10 is closed.

[0016] Each of the pair of coiled elements 14 is formed by winding a monofilament into a coil shape, and as shown in FIG. 3 , units each consisting of an upper leg 41, a lower leg 42, an interlocking head 43, and an inverted portion 44 are arranged in a continuous manner. The coiled elements 14 are typically sewn to the opposing side edges 13 of the pair of fastener tapes 12 by double chain stitching with a sewing thread 48. The upper leg 41 and the lower leg 42 each extend in the width direction of the fastener tape 12, and the interlocking head 43 extends in the vertical direction so as to connect the outer left-right ends of the upper leg 41 and the outer left-right ends of the lower leg 42. The inverted portion 44 extends in a curved manner so as to connect the inner left-right ends of the lower leg 42 and the inner left-right ends of the upper leg 41 between adjacent units. The interlocking head 43 has an interlocking portion that is formed to be wide in the front-rear direction by plastic deformation of the monofilament, allowing the left and right coiled elements 14 to engage with each other.

[0017] A core string 49 is inserted inside the coil element 14 to increase the mechanical strength of the coil element 14 or the strength of attachment to the fastener tape 12 by the sewing thread 48 .

[0018] 1 to 3, the slider 30 includes upper and lower blades 31 and 32 arranged parallel to each other and spaced apart in the vertical direction, a pair of upper flanges 33a provided along both left and right edges of the upper blade 31 and extending toward the lower blade 32, a pair of lower flanges 33b provided along both left and right edges of the lower blade 32 and extending toward the upper blade 31, a guide post 34 connecting the upper blade 31 and the lower blade 32 at their front ends, a pull-tab attachment portion 35 provided on the upper surface of the upper blade 31, and a pull tab (not shown) rotatably attached to the pull-tab attachment portion 35. As a result, left and right shoulder openings 36 separated by the guide post 34 are formed at the front of the slider 30, and a rear opening 37 is formed at the rear of the slider 30. Between the upper blade 31 and the lower blade 32, an approximately Y-shaped element guide passage 38 is provided, which connects the left and right shoulder openings 36 and the rear opening 37, and this element guide passage 38 forms a passage through which a pair of left and right coil-shaped elements 14 are inserted. In the reverse use specification of this embodiment, it is preferable that the height of the lower flange 33b is higher than the height of the upper flange 33a, and the upper flange may be omitted.

[0019] In this embodiment, the pair of fastener tapes 12 each include an overlapping portion 20 formed by folding the tape material to attach a first tape portion 21 to the garment 50 (see FIG. 3 ) and a second tape portion 22 that is shorter in width than the first tape portion 21 and is sewn to the coiled element 14. Specifically, in the reverse-use slide fastener 10, the second tape portion 22 is brought into contact with the coiled element 14, and the first tape portion 21 and the second tape portion 22 are sewn to the coiled element 14 with sewing thread 48.

[0020] The second tape portion 22 faces the lower flange 33b, and has a free end 23 at an end opposite to the opposing ends of the pair of fastener tapes 12 in the left-right direction. In other words, this free end 23 is not connected to the first tape portion 21, and is not connected to the garment 50 either. As a result, even if the lower flange 33b comes into contact with the second tape portion 22 when the slider 30 is lifted upward to perform the opening and closing operation, no tension acts on the second tape portion 22 because the second tape portion 22 serves as the free end 23, and the load acting on the second tape portion 22 can be released to the lower flange 33b in the left-right and up-down directions of the fastener tape 12, thereby preventing strong contact.

[0021] Furthermore, the free end length A of the second tape portion 22, located widthwise outward from the coiled element 14, is at least 0.3 times the width B of the lower flange 33b but less than 2.4 times the width B of the lower flange 33b. By setting the free end length A to at least 0.3 times the width B of the lower flange 33b, the second tape portion 22 can reliably contact the lower flange 33b, thereby suppressing wear of the fastener tape 12. More specifically, since a lateral pulling force is applied to the fastener tape 12 when the fastener is in use (i.e., during a durability test), setting the free end length A to at least 0.3 times the width B of the lower flange 33b allows the second tape portion 22 to sufficiently cover the lower flange 33b. Setting the free end length A to less than 2.4 times the width B of the lower flange 33b can prevent the second tape portion 22 from getting caught inside the slider. It is more preferable that the free end length A be no more than 2.0 times the width B of the lower flange 33b. Furthermore, in consideration of ease of manufacturing when folding the tape material, it is preferable that the free end length A is 1.0 times the width B or more.

[0022] In the present embodiment, the thread density in the second tape portion 22 is preferably higher than that in the first tape portion 21. This can further prevent wear due to contact with the lower flange 33b. In the present embodiment, as shown in FIG. 4 , the tape material has a twill weave 60 across the folding position 24 and across the region C of the first tape portion 21 and the second tape portion 22 where the coil-shaped element is sewn, and has a plain weave 61 in the region D of the second tape portion 22 facing the lower flange 33b and in the region E of the first tape portion 21 other than the region C. By using the twill weave 60 across the folding position and across the region C of the first tape portion 21 and the second tape portion 22 where the coil-shaped element is sewn, the sewing thread 48 can be easily threaded through the fastener tape 12, and the coil-shaped element 14 can be easily sewn to the fastener tape 12. In addition, by using a plain weave 61 in the region D of the second tape portion 22 that faces the lower flange 33b, a fastener tape 12 that is resistant to wear can be constructed, and since the warp and weft threads are densely woven, the thickness is thin and it is less likely to come into contact with the lower flange 33b. The tape material of this embodiment is not limited to the above, and may be formed entirely with the same weave.

[0023] As described above, according to the slide fastener 10 of this embodiment, each of the pair of fastener tapes 12 has an overlapping portion 20 in which a first tape portion 21 and a second tape portion 22 having a width shorter than that of the first tape portion 21 are overlapped. The second tape portion 22 faces the lower flange 33b, and has a free end 23 at an end opposite to the opposing ends of the pair of fastener tapes 12 in the left-right direction, and the length A of the free end of the second tape portion 22 on the widthwise outer side of the coiled element 14 is less than 2.4 times the width B of the lower flange 33b. This suppresses wear of the fastener tape and prevents clogging of the fastener tape.

[0024] The present invention is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present invention.

[0025] For example, the slide fastener 10 of the above-described embodiment has a reverse-use configuration, but the slide fastener of the present invention may be formed in a standard (front-use) configuration in which the coil element is sewn to the upper surface of the fastener tape. In this case, it is preferable that the height of the upper flange is higher than the height of the lower flange.

[0026] Furthermore, although the overlapping portion 20 of the fastener tape 12 is formed by folding the tape material, the overlapping portion 20 may be formed by overlapping two pieces of tape material as shown in FIG. 5. Alternatively, as shown in FIG. 6, the fastener tape 12 may be a Y-shaped fastener tape in which the portion where the coil-shaped element 14 is attached and the portion where the garment is sewn together are defined as a first tape portion 21, and the second tape portion 22 branches off from the left and right outer sides of the portion where the coil-shaped element 14 is attached. Note that the portion sewn to the coil-shaped element 14 may overlap the position where the Y-shaped branching occurs. Also, in such a case, the thread density of the second tape portion 22 may be higher than the thread density of the first tape portion 21. Also, by forming a plain weave in the region of the second tape portion 22 facing the lower flange, a fastener tape 12 that is resistant to wear can be formed. [Example]

[0027] Here, in order to confirm the effect of this embodiment, a durability test was carried out on the slide fastener 10 while changing the free end length A of the second tape portion 22.

[0028] The durability test evaluates the durability of the fastener tape 12 against repeated opening and closing, creating a situation in which the slide fastener 10 is used on a bag and opened and closed under irregular loads, causing the slider 30 and fastener tape 12 to rub against each other and break. In the durability test, the pair of fastener tapes 12 of the slide fastener 10 are clamped, and the slide fastener 10 is bent into an arc with the coiled element 14 positioned on the inside of the curve (toward the center of curvature). A load is also applied to the slider 30 in a direction perpendicular to the fastener stringer 11 (toward the outside of the arc), causing it to perform a reciprocating opening and closing motion. The reciprocating motion of the slider 30 and the pass / fail judgment of the test are in accordance with JIS S3015:2019, "7.11 Reciprocating Opening and Closing Endurance Test."

[0029] In addition, in the durability test, the average number of openings and closings of five times in the durability test for the current slide fastener 10A without an overlapping portion shown in Figure 7 was set to 1, and the number of openings and closings of the slide fastener 10 having a predetermined free end length A of the second tape portion 22 was plotted as a ratio. The results of the durability test are shown in the graph in Figure 8. The width B of the bottom flange of the slide fasteners 10 and 10A is 1.0 mm.

[0030] As a result, when the free end length A of the second tape portion 22 becomes 2.4 times or more the width B of the lower flange 33b, the portion that abuts against the lower flange 33b will tear, and the free end portion on the outside of the torn portion will get into the gap between the lower flange 33b and the inverted portion 44 of the coil-shaped element 14 within the element guide path 38, hindering the sliding of the slider 30 and causing the sliding action of the slider 30 to stop. For this reason, the number of opening and closing cycles is about the same as that of the current product, or 1.5 times or less.

[0031] On the other hand, if the free end length A of the second tape portion 22 is 0.9 times or more but less than 2.4 times the width B of the lower flange 33b, after the second tape portion 22 is torn, the slider 30 will continue to open and close until the first tape portion 21 is torn, so the number of opening and closing times will be 2.0 times or more compared to the current product. [Explanation of symbols]

[0032] 10 Slide fastener 11 Zipper Stringer 12 Zipper Tape 13 Opposite side edge 14 Coiled element 20 Overlapping section 21 First Tape Section 22 Second Tape Section 23 Free end 30 Slider 31 Upper wing plate 32 Lower wing plate 33a Upper flange 33b Lower flange 34 Guidepost 35 Pull attachment part 41 Upper leg 42 Lower leg 43 Interlocking head 44 Reversal section 48 Suture 49 Core cord A Free end length B flange width

Claims

1. a pair of fastener tapes (12) each having a pair of coiled elements (14) attached to opposite side edges (13); a slider (30) through which the pair of coil elements are inserted and which engages and disengages the pair of coil elements; A slide fastener (10) comprising: The slider is An upper blade (31) and a lower blade (32) arranged parallel to each other and spaced apart in the vertical direction; Lower flanges (33b) provided along the left and right side edges of the lower blade, respectively; a guide post (34) connecting the upper blade and the lower blade; and Each of the pair of fastener tapes includes an overlapping portion (20) in which a first tape portion (21) and a second tape portion (22) having a width shorter than that of the first tape portion are overlapped with each other, The second tape portion faces the lower flange, and an end portion opposite to the opposing ends of the pair of fastener tapes in the left-right direction is a free end (23), The length (A) of a free end of the second tape portion located widthwise outside the coil element is less than 2.4 times the width (B) of the lower flange. Slide fastener.

2. The thread density in the second tape portion is higher than the thread density in the first tape portion. The slide fastener according to claim 1 .

3. The second tape portion has a plain weave in a region facing the lower flange.

3. The slide fastener according to claim 2.

4. The fastener tape forms the overlapping portion consisting of the first tape portion and the second tape portion by folding a tape material.

3. The slide fastener according to claim 2.

5. the tape material has a twill weave across a folding position and across an area of ​​the first tape portion and the second tape portion where the coil element is sewn, The second tape portion has a plain weave in a region facing the lower flange.

5. The slide fastener according to claim 4.

6. The length of a free end of the second tape portion that is located widthwise outside the coil element is 0.3 times or more the width of the lower flange. The slide fastener according to claim 1 .

7. The second tape portion is in contact with the coiled element, and the first tape portion and the second tape portion are sewn to the coiled element, which is a reverse-use specification. The slide fastener according to any one of claims 1 to 6.

8. the second tape portion has a plain weave in a region facing the lower flange; The slide fastener according to claim 1 .

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