Slide fastener

Abstract

In a slide fastener (10), at a slider pull-up start position in which an insert pin (70) is inserted into an insert pin insertion hole (63) of a box body (62) and a slider (40) is in contact with the front surface of the box body (62), an engaging head portion (32) of the rearmost element (31a) of one fastener element row (30A) approaches or comes into contact with an engaging portion (74) provided on the insert pin (70). This improves operability in pulling up the slider.

Description

Technical Field

[0001] This invention relates to a slide fastener provided with an opener and an opener for a slide fastener.

Background Art

[0002] For example, in a slide fastener used for front-opening clothes such as jumpers and overcoats, openers are provided at one ends of the left and right fastener strings. Generally, the opener has a box body and a box bar attached to one end of one fastener string, and a butterfly bar attached to one end of the other fastener string.

[0003] As a conventional slide fastener provided with an opener, a slope portion is provided on the upper surface of the box body, which is formed with a downward gradient from the side wall of the box bar insertion hole toward the side wall of the butterfly bar insertion hole. When the box body and the slider come into contact, the slider is formed to be tiltable toward the butterfly bar insertion hole side of the box body, so that the butterfly bar can be smoothly and easily inserted into the butterfly bar insertion hole from obliquely above through the slider (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, depending on the configuration of the slide fastener, such as a water-stop slide fastener with a water-stop film attached to the knitted fastener, force is required to pull up the slider when closing the slide fastener. When trying to pull up the slider, the slider is likely to be twisted toward the box bar side.

[0006] Specifically, as shown in Figure 13A, when the slider 40 is in contact with the front of the box 62 and the hinge rod 70 is inserted into the hinge rod insertion hole of the box 62 via the element guide path 48 of the slider 40 and then the slider 40 is pulled up, the slider 40 is twisted towards the rod box 61, as shown in Figure 13B.

[0007] In particular, braided zippers are obtained by braiding the zipper tape and simultaneously braiding coil-shaped zipper elements into the tape's side edges, which makes it easier to form a flexible zipper stringer. As a result, as the slider 40 twists, the zipper element row 30A on the side having the box bar 61 and box body 62 is pushed by the guide post 45, causing the engagement head 32 of the last element 31a closest to the box bar 61 to move forward (away from the box bar 61), potentially colliding with the engagement head of the last element 31b closest to the butterfly bar 70 in the zipper element row 30B having the butterfly bar 70, and thus failing to engage correctly. As a result, the rearmost elements 31a and 31b, which are closest to the box bar 61 and the butterfly bar 70, would collide with each other and fail to engage properly, which sometimes prevented the slider 40 from being pulled up smoothly.

[0008] This invention has been made in view of the circumstances described above, and its purpose is to provide a slide fastener and an opening tool for a slide fastener that can improve the operability when pulling up the slider. [Means for solving the problem]

[0009] The above objective of the present invention is achieved by the following configuration. (1) A pair of fastener tapes, and a pair of fastener stringers having a pair of rows of fastener elements provided on the opposing tape side edges of the pair of fastener tapes, An opening device having a box bar and box body positioned on one rear end side of the pair of fastener element rows, and a butterfly bar positioned on the other rear end side of the pair of fastener element rows, It comprises an upper wing plate and a lower wing plate arranged parallel to each other and spaced apart in the vertical direction, a guide post connecting the upper wing plate and the lower wing plate at the front end, a flange portion provided on the rear side edge of at least one of the upper wing plate and the lower wing plate, and a slider for engaging and disengaging the pair of rows of fastener elements, A slide fastener equipped with, The box body is provided with the box bar protruding forward from the box body on one side in the width direction where the pair of fastener element rows are arranged, and a butterfly bar insertion hole into which the butterfly bar can be inserted is formed on the other side in the width direction. The butterfly bar is provided with an engagement portion that can engage with the engagement head of the last element of the row of fastener elements, A slide fastener wherein the butterfly bar is inserted into the butterfly bar insertion hole of the box body, and at the starting position for lifting the slider, where the slider is in contact with the front surface of the box body, the meshing head of the last element of one of the fastener element rows is close to or in contact with the meshing portion provided on the butterfly bar. (2) The front surface of the box body has an inclined surface that slopes backward from the box rod side toward the wing rod insertion hole side, The slide fastener according to (1), wherein at the starting position for lifting the slider, the slider is tilted with respect to the width direction in which the pair of fastener element rows are aligned. (3) The slide fastener according to (2), wherein the inclined surface is inclined in the range of 5 to 12 degrees with respect to the width direction in which the pair of fastener element rows are arranged. (4) The box body comprises a box body main body portion in which the butterfly rod insertion hole is provided, and an extension portion that is continuous with the box body main body portion and constitutes the front surface of the box body, The width of the extension is smaller than the width of the main body of the box. The end of the inclined surface on the side of the butterfly pin insertion hole is connected to the front surface of the box body, as described in (2) or (3). (5) The box body comprises a box body main body portion in which the butterfly rod insertion hole is provided, and an extension portion that is continuous with the box body main body portion and constitutes the front surface of the box body, The slide fastener according to any one of (1) to (3), wherein the width of the extension portion is smaller than the width of the main body portion of the box. (6) The slider has parallel portions extending from the rear opening on the inner surface of the flange portion, The box bar has an upright surface on the side opposite to the side facing the butterfly bar, which is aligned with the front-to-back direction of the slide fastener. A slide fastener according to any one of (1) to (5), wherein, at the starting position for lifting the slider, the entire upright surface of the box bar faces the parallel portion of the flange. (7) An opening device for a slide fastener, comprising a box bar and box body that can be positioned on one rear end side of a pair of rows of fastener elements, and a butterfly bar that can be positioned on the other rear end side of a pair of rows of fastener elements, The box body is provided with the box bar protruding forward from one side in the width direction of the box body, and a butterfly bar insertion hole into which the butterfly bar can be inserted is formed on the other side in the width direction of the box body. An opener for a slide fastener, wherein the length of the portion of the box bar that protrudes from the box body is 35-45% of the length of the box bar in the longitudinal direction from the bottom surface of the wing bar insertion hole in the box body to the tip of the box bar. (8) The opening device for a slide fastener according to (7), wherein the front surface of the box body has an inclined surface that slopes backward from the box rod side toward the butterfly rod insertion hole side. (9) The opening device for the slide fastener as described in (8), wherein the inclined surface is inclined in a range of 5 to 12 degrees with respect to the width direction of the box body. (10) The box body comprises a box body main body portion in which the butterfly rod insertion hole is provided, and an extension portion that is continuous with the box body main body portion and constitutes the front surface of the box body, The width of the extension is smaller than the width of the main body of the box. The end of the inclined surface on the side of the butterfly pin insertion hole is connected to the front surface of the box body, and is an opener for a slide fastener as described in (8) or (9). (11) The box body comprises a box body main body portion in which the butterfly rod insertion hole is provided, and an extension portion that is continuous with the box body main body portion and constitutes the front surface of the box body, The width of the extending portion is smaller than the width of the box body main body portion, and it is an opener for a slide fastener according to any one of (7) to (9).

Advantages of the Invention

[0010] According to the present invention, even when the slider is twisted when the slider is pulled up, it is possible to prevent the rearmost elements of the pair of fastener element rows from colliding with each other and not engaging correctly, and it is possible to improve the operability when pulling up the slider.

Brief Description of the Drawings

[0011] [Figure 1] It is a top view for explaining a slide fastener according to an embodiment of the present invention. [Figure 2] It is a side view of the slider. [Figure 3] It is a top view of the wing bar. [Figure 4] It is a perspective view showing the box body and the box bar of the opener. [Figure 5] It is a top view showing the box body and the box bar. [Figure 6] It is a cross-sectional view of the box body at the middle portion in the vertical direction of the box body showing the box body and the box bar. [Figure 7A] It is a view showing the positional relationship between the slider, the opener, and the element in a state where the slider is at the start position of pulling up, with the upper wing plate of the slider cut. [Figure 7B] It is a view showing the positional relationship between the slider, the opener, and the element in a state where the slider is twisted toward the box bar side until the rear opening of the slider becomes parallel to the front surface of the box body main body portion, with the upper wing plate of the slider cut. [Figure 7C] It is a view showing the positional relationship between the slider, the opener, and the element in a state where the slider is most twisted toward the box bar side, with the upper wing plate of the slider cut. [Figure 8] It is a view for explaining a state where the engaging head of the rearmost element of one fastener element row is close to the engaging portion provided on the wing bar. [Figure 9A] This is a top view showing the box body and box bars in the first modified example. [Figure 9B] This is a top view showing the box body and box bars in the second modified example. [Figure 10] This is a top view showing the box body and box bars in the third modified example. [Figure 11A] In the third modified example, the diagram shows the positional relationship between the slider, the opening mechanism, and the element when the slider is in the starting position for lifting, by cutting the upper wing plate of the slider. [Figure 11B] In the third modified example, the diagram shows the positional relationship between the slider, the opening mechanism, and the element when the slider is twisted most towards the box bar side, by cutting the upper wing plate of the slider. [Figure 12] This is a top view showing the box body and box bars in the fourth modified example. [Figure 13A] This diagram shows the positional relationship between the slider, the opening mechanism, and the elements in a conventional slide fastener when the slider is in the starting position for pulling up, by cutting the upper wing plate of the slider. [Figure 13B] This diagram shows the positional relationship between the slider, the opener, and the elements in a conventional slide fastener when the slider is twisted most towards the box bar side, by cutting the upper wing plate of the slider. [Modes for carrying out the invention]

[0012] Hereinafter, an embodiment of the slide fastener according to the present invention will be described in detail with reference to the drawings. In the following description, the upper side refers to the front side with respect to the plane of Figure 1, the lower side refers to the back side with respect to the plane of Figure 1, the front side refers to the upper side with respect to the plane of Figure 1, the rear side refers to the lower side with respect to the plane of Figure 1, the left side refers to the left side with respect to the plane of Figure 1, and the right side refers to the right side with respect to the plane of Figure 1. Therefore, the left-right direction of the slide fastener is the width direction of the pair of fastener element rows described later, and also the width direction of the box body described later. Furthermore, the front-back direction of the slide fastener is also the longitudinal direction of the box bar, and the direction in which the element rows close as the slider moves is the front side, and the direction in which the element rows open is the rear side.

[0013] As shown in Figure 1, the slide fastener 10 of this embodiment comprises a pair of fastener stringers 22A, 22B having a pair of left and right fastener tapes 20A, 20B and a pair of fastener element rows 30A, 30B provided on the opposing tape side edges 21 of the pair of fastener tapes 20A, 20B, a slider 40 for engaging and disengaging the pair of fastener element rows 30A, 30B, upper stoppers 11 provided on the front end side of the pair of fastener element rows 30A, 30B, and an opener 60 provided on the rear end side of the pair of fastener element rows 30.

[0014] This slide fastener 10 is a reverse-use slide fastener in which a pair of fastener element rows 30A and 30B are arranged on the underside of a pair of fastener tapes 20A and 20B. Furthermore, this slide fastener 10 is a water-resistant slide fastener, and a water-resistant film is attached to the upper surface of the fastener tapes 20A and 20B.

[0015] The fastener element rows 30A and 30B are coil-shaped fastener element rows formed by winding a synthetic resin monofilament in a certain direction, and constitute multiple fastener elements 31. Examples of synthetic resin materials for the monofilament include polyester and nylon.

[0016] The rows of zipper elements 30A and 30B are sewn to the underside (back side) of the tape side edges 21 of the zipper tapes 20A and 20B with sewing thread (not shown). Furthermore, this slide zipper 10 is a braided zipper as described in the prior art, and a braided zipper is obtained by braiding the zipper tapes 20A and 20B and simultaneously braiding coil-shaped rows of zipper elements into the tape side edges 21 of the zipper tapes 20A and 20B.

[0017] The slider 40 comprises a slider body 41 and a pull tab 42 attached to the upper surface of the slider body 41. When the slider 40 is moved toward the upper stop 11, the left and right rows of fastener elements 30A and 30B engage, and when the slider 40 is moved toward the opener 60, the left and right rows of fastener elements 30A and 30B separate. In this embodiment, the slider 40 is a slider with an automatic stop function, but it may also be a slider without an automatic stop function.

[0018] As shown in Figure 2, the fuselage 41 comprises an upper wing plate 43 and a lower wing plate 44 arranged parallel to each other and spaced apart in the vertical direction, a guide post 45 connecting the upper wing plate 43 and the lower wing plate 44 at the front end, flanges 46a projecting downward along both left and right edges of the upper wing plate 43, flanges 46b projecting upward along both left and right edges of the lower wing plate 44, and a raised portion 47 formed on the lower surface of the upper wing plate 43 to guide the left and right fastener element rows 30A and 30B. A substantially Y-shaped element guide passage 48 is formed between the upper wing plate 43 and the lower wing plate 44 through which the left and right fastener element rows 30A and 30B are inserted. Furthermore, a tape groove 49 is formed between the upper and lower flanges 46a and 46b through which fastener tapes 20A and 20B are inserted. Note that flanges only need to be formed on at least one of the upper wing plate 43 and the lower wing plate 44. For example, in a reverse-use slide fastener as shown in Figure 1, where the rows of fastener elements 30A and 30B are arranged on the underside of the fastener tapes 20A and 20B, a flange may be provided only on the lower wing plate 44 of the slider.

[0019] Furthermore, the left and right flanges 46a and 46b are formed to guide the reversal portion 33 of the fastener element 31 when it is separated at the shoulder side of the element guide path 48, and to guide the reversal portion 33 of the fastener element 31 when it is engaged at the rear end of the element guide path 48 (see Figure 7A). Furthermore, as shown in Figure 7A, the inner surfaces of the left and right flanges 46a and 46b have parallel sections 46b1 extending from the rear opening, curved sections 46b2 curving away from each other toward the shoulder, and straight sections 46b3 extending further away from each other toward the shoulder from the curved sections 46b2. In Figure 7A, only the flange 46b of the lower wing plate 44 is shown, but the flange 46a of the upper wing plate 43 also has the same shape in a top view and has parallel sections, curved sections, and straight sections. In Figure 7A, the dashed lines represent the boundary positions of the parallel section 46b1, the curved section 46b2, and the straight section 46b3.

[0020] Returning to Figure 1, the opening device 60 comprises a box bar 61 and a box body 62 positioned on the rear end side of one of the left and right rows of fastener elements 30A and 30B, i.e., on the rear end side of fastener element 30A, and a butterfly bar 70 that can be inserted into the box body 62, positioned on the rear end side of the other of the left and right rows of fastener elements 30A and 30B, i.e., on the rear end side of fastener element 30B.

[0021] The butterfly bar 70 is attached to the rear end of the tape side edge 21 of the fastener tape 20A by injection molding. As shown in Figure 3, the butterfly bar 70 has a rectangular prism-shaped butterfly bar body 71, a lateral projection 72 that protrudes further toward the box bar 61 from the side surface 71a of the butterfly bar body 71 facing the box bar 61 on the front side of the butterfly bar body 71, and a forward projection 73 that protrudes forward from the front surface 71b of the butterfly bar body 71.

[0022] Furthermore, a meshing portion 74 is formed in front of the lateral projection 72, which can mesh with the meshing head 32 of the last element 31a of one of the fastener element rows 30A that is closest to the box bar 61. Between the meshing portion 74 and the front projection 73, there is a housing portion 75 that accommodates the rear half of the meshing head 32 of the last element 31a of one of the fastener element rows 30A. In addition, a fitting recess 76 with a cutout on the upper side is formed behind the lateral projection 72. Furthermore, a stepped surface 77 may be formed along the front-rear direction in the middle of the width direction of the lateral projection 72 and the meshing portion 74. When the butterfly bar 70 is pulled out of the slider 40, if the lock pin of the slider 40 falls between the meshing portion 74 and the meshing head 32 of the last element 31a, it becomes difficult to pull out the butterfly bar 70. The stepped surface 77 makes it less likely for the lock pin to fall between the meshing portion 74 and the meshing head 32, allowing the butterfly pin 70 to be easily pulled out of the slider 40.

[0023] The forward projection 73 has a bulge 73a that protrudes on the side 71b of the butterfly bar body 71 that is opposite the box bar, and is connected to the side 71b that is opposite the box bar via a concave curved surface 73b. This bulge 73a can come into contact with the flange 46b when the slider 40, which will be described later, is pulled up (see Figure 7B), suppressing the butterfly bar 70 from moving away from the box bar 61, and acting to correctly engage the engaging head 32 and the meshing portion 74 of the last element 31a of one of the fastener element rows 30A.

[0024] In this embodiment, the box bar 61 and the box body 62 are integrally formed by injection molding and attached to the rear end of the tape side edge 21 of the fastener tape 20A. However, the box bar 61 and the box body 62 may be molded separately, and the box bar 61 may be attached to the box body 62.

[0025] As shown in Figures 4 to 6, an engaging portion 63 is formed on the side of the box bar 61 on the side facing the hinge bar, with its upper side protruding and being inserted into the fitting recess 76 of the hinge bar 70. A stepped portion 64 is formed in front of the engaging portion 63 into which a lateral projection 72 fits. On the side of the box bar 61 opposite the hinge bar, an upright surface 61a is formed that is facing the inner surfaces of the flanges 46a and 46b of the slider 40 and is aligned with the front-rear direction of the slide fastener 10. The upright surface 61a may be a flat surface extending substantially vertically forward from the front surface 65a of the box body portion 65. A curved surface that curves and forms the tip of the box bar 61 is connected to the front side of the upright surface 61a.

[0026] The box body 62 is formed in a substantially rectangular parallelepiped shape and has a box body main portion 65 having sides parallel to each other on both sides in the width direction and aligned with the front-to-back direction of the slide fastener 10, and an extension portion 66 provided in front of the box body main portion 65 and extending forward from the inside beyond the outer surface of the box body main portion 65. Therefore, as shown in Figure 5, the width W1 of the extension portion 66 is smaller than the width of the box body main portion 65.

[0027] A box bar 61 is integrally formed on one side of the box body 62 in the width direction, while a wing bar insertion hole 67 is formed on the other side of the box body 62 in the width direction, penetrating in the front-to-back direction and also opening on the side. This allows a wing bar 70 to be inserted into the wing bar insertion hole 67 on the other side of the box body 62 in the width direction.

[0028] In front of the extension portion 66, that is, on the front surface of the box body 62, an inclined surface 68 is formed that slopes backward from the box bar 61 side toward the butterfly rod insertion hole 67 side. The inclination angle θ of the inclined surface 68 is in the range of 5 to 12 degrees with respect to the width direction in which the left and right fastener element rows 30A and 30B are aligned. In this embodiment, the position where the inclined surface 68 is at the same height as the front surface 65a of the box body portion 65 is called the butterfly rod insertion hole side end 68a. The butterfly rod insertion hole side end 68a is connected to the front surface 65a of the box body portion 65. As a result, the box bar 61 is provided projecting forward from the inclined surface 68 of the extension portion 66 on one side in the width direction of the box body 62.

[0029] As shown in Figure 6, the length L1 of the portion of the box bar 61 that protrudes from the box body 62 is set to 35-45% of the length L of the box bar 61 in the longitudinal direction, from the bottom surface 67a of the wing bar insertion hole 67 of the box body 62 to the tip of the box bar 61.

[0030] In the slide fastener 10 configured in this way, when closing the slide fastener 10 by engaging the pair of fastener element rows 30A and 30B, first, the slider 40 is pulled down until it comes into contact with the inclined surface 68, which is the front surface of the box body 62.

[0031] Here, as shown in Figure 7A, the last element 31a of one of the fastener element rows 30A is inserted deeper into the rear opening side of the slider 40, so the engagement head 32 of the last element 31a of one of the fastener element row 30A approaches the element guide path 48 on the butterfly bar 70 side. That is, in a top view, the engagement head 32 of the last element 31a of one of the fastener element row 30A approaches the element guide path 48 on the butterfly bar 70 side, in the left-right direction, beyond the extension line X of the side surface of the engagement portion 63 of the box bar 62.

[0032] However, the slider 40 has flanges 46a and 46b on the box bar side that are further away from the box body 65 than flanges 46a and 46b on the butterfly bar side, and is in an inclined position with respect to the front of the box body 65, that is, the width direction in which the left and right rows of fastener elements 30A and 30B are aligned. Therefore, the element guide path 48 on the butterfly bar 70 side is inclined away from the meshing head 32 of the last element 31a of one of the fastener element rows 30A, thus ensuring a wide element guide path 48 on the butterfly bar 70 side. This minimizes collision between the meshing portion 74 of the butterfly bar 70 and the meshing head 32 of the last element 31b, allowing the butterfly bar 70 to be smoothly inserted into the butterfly bar insertion hole 67 of the box body 62 via the element guide path 48 of the slider 40.

[0033] Furthermore, by setting the inclination angle θ of the inclined surface 68 to 5 degrees or more with respect to the width direction in which the left and right fastener element rows 30A and 30B are aligned, a wide element guide path 48 on the butterfly rod 70 side can be secured when inserting the butterfly rod 70. In addition, by setting the inclination angle θ to 12 degrees or less, the element guide path 48 on the butterfly rod 70 side and the butterfly rod insertion hole 67 of the box body 62 will not bend significantly, which would make it difficult to insert the butterfly rod 70.

[0034] Then, as shown in Figure 7A, when the hinge rod 70 is inserted into the hinge rod insertion hole 67 of the box body 62 and the slider 40 is in contact with the inclined surface 68 of the box body 62, this is the starting position for lifting the slider 40.

[0035] At this starting position for lifting, the meshing head 32 of the last element 31a of one of the fastener element rows 30A is in contact with the meshing portion 74 provided on the butterfly bar 70.

[0036] In this embodiment, at the starting position for lifting the slider 40, the meshing head 32 of the last element 31a of one of the fastener element rows 30A is in contact with the meshing portion 74 provided on the butterfly rod 70, but it is sufficient if they are close to each other even if they are not in contact. Here, the meshing head 32 of the last element 31a being close to the meshing portion 74 provided on the butterfly rod 70 means, as shown in Figure 8, that in a top view, the distance D1 between the meshing head 32 of the last element 31a and the meshing portion 74 of the butterfly rod 70 is shorter than the distance D2 between the meshing head 32 of the last element 31a and the guide column 45.

[0037] As described above, at the starting position for lifting the slider 40, the last elements 31a and 31b of the pair of fastener element rows 30A and 30B are further recessed towards the rear end of the slider. In this state, the entire upright surface 61a of the box bar 61 formed on the side opposite to the side facing the butterfly bar 70 faces the parallel portion 46b1 of the flange portions 46a and 46b. Furthermore, the inverted portion 33 of the last element 31a of one of the fastener element rows 30A is guided by the curved portion 46b2 of the flange portions 46a and 46b.

[0038] In this embodiment, since the slide fastener 10 has a waterproof film attached to the fastener tapes 20A and 20B, force is required to pull up the slider 40 at the starting position for pulling up the slider 40. When attempting to pull up the slider 40, the slider 40 is twisted towards the box bar in the order shown in Figures 7B and 7C, starting from the connection point 69 between the inclined surface 68 and the upright surface 61a of the box bar 61.

[0039] At the start position of the slider's pull-up mechanism, the last element 31a of one fastener element row 30A is in contact with the flange portions 46a and 46b, and the engaging head 32 of the last element 31a is close to or in contact with the engaging portion 74 provided on the butterfly pin 70. In addition, although the engaging head 32 of the last element 31a of one fastener element row 30A is not in contact with the engaging head 32 of the last element 31b of the other fastener element row 30B, they are closer to each other than in the case of a conventional slide fastener shown in Figure 13A.

[0040] Therefore, when the slider 40 is twisted, the meshing head 32 of the last element 31a of one of the fastener element row 30A remains in contact with the meshing portion 74 provided on the butterfly bar 70, and as shown in Figure 7B, it also comes into contact with the meshing head 32 of the last element 31b of the other fastener element row 30B, which is pushed by the flange portions 46a and 46b. Then, when the slider 40 is twisted further, the meshing head 32 of the last element 31a of one of the fastener element row 30A passes between the meshing portion 74 and the meshing head 32 of the last element 31b of the other fastener element row 30B, and they become meshed. This prevents the meshing heads 32 of the last elements 31a and 31b from colliding and failing to engage properly, and the slider 40 is then smoothly pulled up.

[0041] As described above, according to the slide fastener 10 of this embodiment, at the starting position for pulling up the slider 40, the engagement head 32 of the last element 31a of one of the fastener element rows 30A is close to or in contact with the engagement portion 74 provided on the butterfly pin 70. This prevents the last elements 31a and 31b of the pair of fastener element rows 30A and 30B from colliding and failing to engage properly, even if the slider 40 is twisted, thereby improving the operability when pulling up the slider 40.

[0042] Furthermore, according to the slide fastener opener 60 of this embodiment, the length L1 of the portion of the box bar 61 that protrudes from the box body 62 is set to 35-45% of the length L of the box bar 61 in the longitudinal direction, from the bottom surface 67a of the wing bar insertion hole 67 of the box body 62 to the tip of the box bar 61. In other words, by shortening the length of the box bar 61 so that the length L1 of the box bar 61 is 45% or less of the length L, at the starting position for pulling up the slider 40, the last element 31a of one of the fastener element rows 30A is inserted deeper into the rear side of the slider 40. As a result, even if the slider 40 is twisted when pulling up the slider 40, the last elements 31a and 31b of the pair of fastener element rows 30A and 30B do not collide with each other and fail to engage properly, thereby improving the operability when pulling up the slider 40. On the other hand, by making the length L1 of the box bar 61 35% or more of the length L, the insertability of the hinge bar 70 and the appearance of the box body 62 can be maintained.

[0043] It should be noted that the present invention is not limited to the embodiments illustrated above, and can be modified as appropriate without departing from the spirit of the invention. For example, in the first modified example shown in Figure 9A, the extension portion 66 of the box body 62 has a configuration in which the sides aligned with the front-to-back direction of the slide fastener 10 are on both the side of the box rod 61 and the side of the butterfly rod insertion hole 67. In this case, compared to the above embodiment, the length L1 of the portion of the box bar 61 that protrudes from the box body 62 is shortened, and the ratio of the length L1 of the box bar 61 to the length L from the bottom surface 67a of the butterfly bar insertion hole 67 of the box body 62 to the tip of the box bar 61 in the longitudinal direction of the box bar 61 becomes smaller. As a result, at the starting position for lifting the slider 40, the last element 31a of one of the fastener element row 30A is inserted deeper into the rear side of the slider 40, and the meshing head 32 of the last element 31a of one of the fastener element row 30A is more likely to come closer to or come into contact with the meshing portion 74 provided on the butterfly bar 70.

[0044] Furthermore, in the second modified example shown in Figure 9B, the box body 62 may be configured such that the box body main body 65 is made longer in the longitudinal direction of the box rod 61, without providing the extension portion 66, and an inclined surface 68 is formed on the front surface of the box body main body 65. In this case as well, similar to the first modification, the length L1 of the portion of the box bar 61 that protrudes from the box body 62 becomes shorter, and the ratio of the length L1 of the box bar 61 to the length L from the bottom surface 67a of the wing bar insertion hole 67 of the box body 62 to the tip of the box bar 61 in the longitudinal direction of the box bar 61 becomes smaller.

[0045] Furthermore, in the third modified example shown in Figure 10, the box body 62 is made longer in the longitudinal direction of the hinge rod 61 without the extension portion 66, and the front surface of the box body 65 is formed along the width direction of the box body 62 without the inclined surface 68.

[0046] In this case as well, similar to the above embodiment, the ratio of the length L1 of the box bar 61 to the length L from the bottom surface 67a of the butterfly bar insertion hole 67 of the box body 62 to the tip of the box bar 61 in the longitudinal direction of the box bar 61 is set to 35-45%. As a result, as shown in Figure 11A, at the starting position for lifting the slider 40, the last element 31a of one of the fastener element row 30A is inserted deeper into the rear side of the slider 40, and the meshing head 32 of the last element 31a of one of the fastener element row 30A is in close proximity to or in contact with the meshing portion 74 provided on the butterfly bar 70.

[0047] Furthermore, as shown in Figure 11B, even if the slider 40 is twisted, the meshing head 32 of the last element 31a of one of the fastener element rows 30A remains in contact with the meshing portion 74 provided on the butterfly bar 70, and passes between the meshing portion 74 and the meshing head 32 of the last element 31b of the other fastener element row 30B, resulting in a meshed state. This prevents the meshing heads 32 of the last elements 31a and 31b from colliding and failing to engage properly, and thereafter the slider 40 can be smoothly pulled up.

[0048] Furthermore, in the case where the box body 62 does not have an inclined surface, as in the third modified example, in order to ensure that the hinge rod 70 can be inserted into the box body 62, the hinge rod 70 may be made thinner by further concave the concave curved surface 73b while maintaining the width of the bulging portion 73a of the forward projection portion 73.

[0049] Furthermore, in the fourth modified example shown in Figure 12, similar to the third modified example, the box body 62 does not have an inclined surface, but the box body 62 has a box body main portion 65 and an extension portion 66, similar to the above embodiment. Therefore, the front surface of the extension portion 66 is parallel to the front surface of the box body main portion 65 and is formed along the width direction of the box body 62.

[0050] Furthermore, although the above embodiment illustrates the application of the present invention to a reverse-use slide fastener in which the row of fastener elements is arranged on the lower side of the fastener tape, the present invention is not limited to this, and may also be applied to a front-use slide fastener in which the row of fastener elements is arranged on the upper side of the fastener tape.

[0051] Furthermore, in the above embodiment, the opening device of the present invention is applied to a watertight slide fastener in which a watertight film is attached to a braided fastener. However, the present invention is not limited to this and can be suitably applied to slide fasteners in which the slider tends to twist when the slider is pulled up.

[0052] As described above, the following matters are disclosed in this specification: (1) A pair of fastener tapes, and a pair of fastener stringers having a pair of rows of fastener elements provided on the opposing tape side edges of the pair of fastener tapes, An opening device having a box bar and box body positioned on one rear end side of the pair of fastener element rows, and a butterfly bar positioned on the other rear end side of the pair of fastener element rows, It comprises an upper wing plate and a lower wing plate arranged parallel to each other and spaced apart in the vertical direction, a guide post connecting the upper wing plate and the lower wing plate at the front end, a flange portion provided on the rear side edge of at least one of the upper wing plate and the lower wing plate, and a slider for engaging and disengaging the pair of rows of fastener elements, A slide fastener equipped with, The box body is provided with the box bar protruding forward from the box body on one side in the width direction where the pair of fastener element rows are arranged, and a butterfly bar insertion hole into which the butterfly bar can be inserted is formed on the other side in the width direction. The butterfly bar is provided with an engagement portion that can engage with the engagement head of the last element of the row of fastener elements, A slide fastener wherein the butterfly bar is inserted into the butterfly bar insertion hole of the box body, and at the starting position for lifting the slider, where the slider is in contact with the front surface of the box body, the meshing head of the last element of one of the fastener element rows is close to or in contact with the meshing portion provided on the butterfly bar. This configuration prevents the last elements of a pair of fastener elements from colliding and failing to engage properly, even if the slider is twisted when pulled up, thereby improving the operability when pulling up the slider.

[0053] (2) The front surface of the box body has an inclined surface that slopes backward from the box rod side toward the wing rod insertion hole side, The slide fastener according to (1), wherein at the starting position for lifting the slider, the slider is tilted with respect to the width direction in which the pair of fastener element rows are aligned. With this configuration, when the slider is in contact with the inclined surface which is the front of the box, collision between the interlocking portion of the hinge and the interlocking head of the last element of the other row of fastener elements is minimized, allowing the hinge to be smoothly inserted into the hinge insertion hole of the box.

[0054] (3) The slide fastener according to (2), wherein the inclined surface is inclined in the range of 5 to 12 degrees with respect to the width direction in which the pair of fastener element rows are arranged. With this configuration, the hinge can be smoothly inserted into the hinge insertion hole of the box when the slider is in contact with the inclined surface, which is the front of the box.

[0055] (4) The box body comprises a box body main body portion in which the butterfly rod insertion hole is provided, and an extension portion that is continuous with the box body main body portion and constitutes the front surface of the box body, The width of the extension is smaller than the width of the main body of the box. The end of the inclined surface on the side of the butterfly pin insertion hole is connected to the front surface of the box body, as described in (2) or (3). With this configuration, the end of the sloping surface on the side with the butterfly rod insertion hole is connected to the front of the main body of the box without any steps, so the dimensions of the extension can be reduced and the appearance of the box can be maintained as much as possible.

[0056] (5) The box body comprises a box body main body portion in which the butterfly rod insertion hole is provided, and an extension portion that is continuous with the box body main body portion and constitutes the front surface of the box body, The slide fastener according to any one of (1) to (3), wherein the width of the extension portion is smaller than the width of the main body portion of the box. This configuration allows the dimensions of the main body of the box to remain the same as conventional products, while reducing the dimensions of the extension, thereby maintaining the box's appearance as much as possible.

[0057] (6) The slider has parallel portions extending from the rear opening on the inner surface of the flange portion, The box bar has an upright surface on the side opposite to the side facing the butterfly bar, which is aligned with the front-to-back direction of the slide fastener. A slide fastener according to any one of (1) to (5), wherein, at the starting position for lifting the slider, the entire upright surface of the box bar faces the parallel portion of the flange. With this configuration, at the starting position for lifting the slider, the last element of one row of fastener elements is inserted more deeply into the rear side of the slider, and the engagement head of the last element of one row of fastener elements is more likely to come into close proximity to or contact with the engagement portion provided on the butterfly pin.

[0058] (7) An opening device for a slide fastener, comprising a box bar and box body that can be positioned on one rear end side of a pair of rows of fastener elements, and a butterfly bar that can be positioned on the other rear end side of a pair of rows of fastener elements, The box body is provided with the box bar protruding forward from one side in the width direction of the box body, and a butterfly bar insertion hole into which the butterfly bar can be inserted is formed on the other side in the width direction of the box body. An opener for a slide fastener, wherein the length of the portion of the box bar that protrudes from the box body is 35-45% of the length of the box bar in the longitudinal direction from the bottom surface of the wing bar insertion hole in the box body to the tip of the box bar. With this configuration, at the starting position for pulling up the slider, the last element of one row of fastener elements is inserted more deeply into the rear side of the slider. This prevents the last elements of the pair of fastener element rows from colliding and failing to engage properly, even if the slider is twisted when pulled up, thereby improving the operability when pulling up the slider.

[0059] (8) The opening device for a slide fastener according to (7), wherein the front surface of the box body has an inclined surface that slopes backward from the box rod side toward the butterfly rod insertion hole side. With this configuration, when the slider is in contact with the inclined surface which is the front of the box, collision between the interlocking portion of the hinge and the interlocking head of the last element of the other row of fastener elements is minimized, allowing the hinge to be smoothly inserted into the hinge insertion hole of the box.

[0060] (9) The opening device for the slide fastener as described in (8), wherein the inclined surface is inclined in a range of 5 to 12 degrees with respect to the width direction of the box body. With this configuration, the hinge can be smoothly inserted into the hinge insertion hole of the box when the slider is in contact with the inclined surface, which is the front of the box.

[0061] (10) The box body comprises a box body main body portion in which the butterfly rod insertion hole is provided, and an extension portion that is continuous with the box body main body portion and constitutes the front surface of the box body, The width of the extension is smaller than the width of the main body of the box. The end of the inclined surface on the side of the butterfly pin insertion hole is connected to the front surface of the box body, and is an opener for a slide fastener as described in (8) or (9). With this configuration, the end of the sloping surface on the side with the butterfly rod insertion hole is connected to the front of the main body of the box without any steps, so the dimensions of the extension can be reduced and the appearance of the box can be maintained as much as possible.

[0062] (11) The box body comprises a box body main body portion in which the butterfly rod insertion hole is provided, and an extension portion that is continuous with the box body main body portion and constitutes the front surface of the box body, The opening device for a slide fastener according to any one of (7) to (9), wherein the width of the extension portion is smaller than the width of the main body portion of the box. This configuration allows the dimensions of the main body of the box to remain the same as conventional products, while reducing the dimensions of the extension, thereby maintaining the box's appearance as much as possible. [Explanation of Symbols]

[0063] 10 slide fasteners 11 Top stop 20A, 20B Fastener Tape 21 Tape side edge 22A, 22B Fastener Stringer 30A, 30B Fastener element row 31 Fastener elements 40 Slider 43 Upper wing plate 44 Lower wing plate 45 Guidepost 46a, 46b Flange section 60 Opening tool 61 Box rod 61a Upright surface 62 Box body 65 Main body part of the box body 66 Extended part 67 Butterfly rod insertion hole 68 Inclined surface 70 Butterfly rod 74 Engaging part

Claims

1. A braided fastener comprising a pair of fastener tapes (20A, 20B), and a pair of coiled fastener element rows (30A, 30B) provided on the opposing tape side edges (21) of the pair of fastener tapes, wherein the pair of fastener tapes are formed by knitting, and the coiled fastener element rows are braided into the tape side edges of the pair of fastener tapes, and a pair of fastener stringers (22A, 22B) having a waterproof film attached to the upper surface of the fastener tapes, An opener (60) having a box bar (61) and a box body (62) positioned on one rear end side of the pair of fastener element rows, and a butterfly bar (70) positioned on the other rear end side of the pair of fastener element rows, It has an upper wing plate (43) and a lower wing plate (44) arranged parallel to each other and spaced apart in the vertical direction, a guide post (45) connecting the upper wing plate (43) and the lower wing plate (44) at the front end, and flange portions (46a, 46b) provided on at least one of the rear side edges of the upper wing plate (43) and the lower wing plate (44), and a slider (40) for engaging and disengaging the pair of fastener element rows (30A, 30B), A slide fastener (10) comprising, The box body (62) is provided with the box bar (61) protruding forward from the box body on one side in the width direction where the pair of fastener element rows are arranged, and a butterfly bar insertion hole (67) into which the butterfly bar (70) can be inserted is formed on the other side in the width direction. The butterfly bar (70) is provided with an engagement portion (74) that can engage with the engagement head (32) of the last element (31a) of one of the fastener element rows (30A), The slider (40) has, on the inner surface of the flange portion (46a, 46b), parallel portions (46b1) extending from the rear opening and parallel to each other, and curved portions (46b2) that curve away from each other toward the shoulder side from the parallel portions, The box bar (61) has an upright surface (61a) on the side opposite to the side facing the butterfly bar, which is aligned with the front-to-back direction of the slide fastener. When the butterfly rod (70) is inserted into the butterfly rod insertion hole (67) of the box body (62), and the slider (40) is in contact with an inclined surface (68) provided on the front surface of the box body (62) that slopes backward from the box rod (61) side toward the butterfly rod insertion hole (67) side, at the starting position of the slider's lifting, (i) the entire upright surface (61a) of the box rod (61) faces the parallel portion of the flange, and (ii) one of the fasteners A slide fastener (10) in which the inverted portion (33) of the last element (31a) of the element row (30A) is guided by the curved portion of the flange, and (iii) the meshing head (32) of the last element (31a) of one of the fastener element rows (30A) is in close proximity to or in contact with the meshing portion (74) provided on the butterfly bar (70), wherein all three conditions (i) to (iii) are simultaneously met.

2. The slide fastener (10) according to claim 1, wherein the inclined surface (68) is inclined at a range of 5 to 12 degrees with respect to the width direction in which the pair of fastener element rows are arranged.

3. The box body (62) comprises a box body main body portion (65) in which the butterfly rod insertion hole is provided, and an extension portion (66) that is continuous with the box body main body portion (65) and constitutes the front surface of the box body. The width of the extension (W1) is smaller than the width of the main body of the box (W2). The slide fastener (10) according to claim 1, wherein the end (68a) of the inclined surface (68) on the side of the butterfly pin insertion hole is connected to the front surface (65a) of the box body portion (65).

4. The box body (62) comprises a box body main body portion (65) in which the butterfly rod insertion hole is provided, and an extension portion (66) that is continuous with the box body main body portion (65) and constitutes the front surface of the box body. The slide fastener (10) according to claim 1 or 2, wherein the width of the extension portion (W1) is smaller than the width of the box body portion (W2).

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