SLIDE FASTENER, AND OPENING ASSEMBLY FOR SLIDE FASTENER

Abstract

In a slide fastener, at a slider pull-up start position in which an insert pin is inserted into an insert pin insertion hole of a box body and a slider is in contact with the front surface of the box body, an engaging head portion of the rearmost element of one fastener element row approaches or comes into contact with an engaging portion provided on the insert pin.

Claims

2. The slide fastener according to claim 1, wherein the front surface of the box body has an inclined surface inclined backward from a side of the box pin toward a side of the separable pin insertion hole, and the slider is inclined with respect to the width direction in which the pair of fastener element rows are arranged at the pull-up start position of the slider.

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

4. The slide fastener according to claim 2, wherein the box body includes a box body main body portion provided with the separable pin insertion hole, and an extending portion continuous from the box body main body portion and forming the front surface of the box body, a width of the extending portion is smaller than a width of the box body main body portion, and an end portion on a separable pin insertion hole side of the inclined surface is connected to a front surface of the box body main body portion.

5. The slide fastener according to claim 1, wherein the box body includes a box body main body portion provided with the separable pin insertion hole, and an extending portion continuous from the box body main body portion and forming the front surface of the box body, and a width of the extending portion is smaller than a width of the box body main body portion.

6. The slide fastener according to claim 1, wherein the slider includes parallel portions extending from a backward opening and parallel to each other on an inner surface of the flange portion, the box pin has a standing surface along a front-back direction of the slide fastener on a side surface opposite a side facing the separable pin, and the entire standing surface of the box pin faces the parallel portions of the flange portion at the pull-up start position of the slider.

7. An opening device for a slide fastener, comprising: a box pin and a box body configured to be disposed on a back end side of one of a pair of fastener element rows; and a separable pin configured to be disposed on a back end side of another of the pair of fastener element rows, wherein the box body is provided with the box pin protruding forward from the box body on one side in a width direction of the box body, and a separable pin insertion hole into which the separable pin is insertable is formed on another side in the width direction of the box body, and a length of a portion of the box pin protruding from the box body is 35% to 45% of a length from a bottom surface of the separable pin insertion hole of the box body to a tip end of the box pin in a longitudinal direction of the box pin.

8. The opening device for the slide fastener according to claim 7, wherein a front surface of the box body has an inclined surface inclined backward from a side of the box pin toward a side of the separable pin insertion hole.

9. The opening device for the slide fastener according to claim 8, wherein the inclined surface is inclined in a range of 5 degrees to 12 degrees with respect to the width direction of the box body.

10. The opening device for the slide fastener according to claim 8, wherein the box body includes a box body main body portion provided with the separable pin insertion hole, and an extending portion continuous from the box body main body portion and forming the front surface of the box body, a width of the extending portion is smaller than a width of the box body main body portion, and an end portion on a separable pin insertion hole side of the inclined surface is connected to a front surface of the box body main body portion.

11. The opening device for the slide fastener according claim 7, wherein the box body includes a box body main body portion provided with the separable pin insertion hole, and an extending portion continuous from the box body main body portion and forming a front surface of the box body, and a width of the extending portion is smaller than a width of the box body main body portion.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0051] FIG. 1 is a top view illustrating a slide fastener according to an embodiment of the present invention.

[0052] FIG. 2 is a side view of a slider.

[0053] FIG. 3 is a top view of a separable pin.

[0054] FIG. 4 is a perspective view showing a box body and a box pin of an opening device.

[0055] FIG. 5 is a top view showing the box body and the box pin.

[0056] FIG. 6 is a cross-sectional view illustrating the box body and the box pin in an intermediate portion of the box body in an upper-lower direction.

[0057] FIG. 7A is a view showing a positional relationship among the slider, the opening device, and elements in a state where the slider is at a pull-up start position, by cutting an upper blade of the slider.

[0058] FIG. 7B is a view showing a positional relationship among the slider, the opening device, and the elements in a state where the slider is twisted toward a box pin side until a backward opening of the slider becomes parallel to a front surface of the box body main body portion, by cutting an upper blade of the slider.

[0059] FIG. 7C is a view showing the positional relationship among the slider, the opening device, and the elements in a state where the slider is most twisted toward the box pin side, by cutting the upper blade of the slider.

[0060] FIG. 8 is a view for illustrating a state in which a meshing head portion of a backmost element of one of fastener element rows is close to a meshing portion provided on the separable pin.

[0061] FIG. 9A is a top view illustrating a box body and a box pin in a first modification.

[0062] FIG. 9B is a top view illustrating a box body and a box pin in a second modification.

[0063] FIG. 10 is a top view showing a box body and a box pin in a third modification.

[0064] FIG. 11A is a view showing a positional relationship among a slider, an opening device, and elements in a state where the slider is at a pull-up start position, by cutting an upper blade of the slider, in the third modification.

[0065] FIG. 11B is a view showing the positional relationship among the slider, the opening device, and the elements in a state where the slider is most twisted toward a box pin side, by cutting the upper blade of the slider, in the third modification.

[0066] FIG. 12 is a top view showing a box body and a box pin in a fourth modification.

[0067] FIG. 13A is a view showing a positional relationship among a slider, an opening device, and elements in a state where the slider is at a pull-up start position, by cutting an upper blade of the slider, in a slide fastener in the related art.

[0068] FIG. 13B is a view showing the positional relationship among the slider, the opening device, and the elements in a state where the slider is most twisted toward a box pin side, by cutting the upper blade of the slider, in the slide fastener in the related art.

DESCRIPTION OF EMBODIMENTS

[0069] Hereinafter, an embodiment of a slide fastener according to the present invention will be described in detail with reference to the drawings. In the following description, an upper side is a near side with respect to a paper surface of FIG. 1, a lower side is a far side with respect to the paper surface of FIG. 1, a front side is an upper side with respect to the paper surface of FIG. 1, a back side is a lower side with respect to the paper surface of FIG. 1, a left side is a left side with respect to the paper surface of FIG. 1, and a right side is the right side with respect to the paper surface of FIG. 1. Accordingly, a left-right direction of the slide fastener is a width direction of a pair of fastener element rows to be described later, and is also a width direction of a box body to be described later. Further, a front-back direction of the slide fastener is a longitudinal direction of a box pin, and a direction in which the element rows close as the slider moves is a front side, and a direction in which the element rows open is a back side.

[0070] As shown in FIG. 1, a slide fastener 10 of the present embodiment includes a pair of fastener stringers 22A and 22B that includes a pair of left and right fastener tapes 20A and 20B and a pair of fastener element rows 30A and 30B respectively provided on facing tape side-edge portions 21 of the pair of fastener tapes 20A and 20B, a slider 40 that meshes together and separates the pair of fastener element rows 30A and 30B, upper stop portions 11 respectively provided on front end sides of the pair of fastener element rows 30A and 30B, and an opening device 60 provided on back end sides of the pair of fastener element rows 30.

[0071] The slide fastener 10 is a reverse-opening slide fastener in which the pair of fastener element rows 30A and 30B are disposed on lower surface sides of the pair of fastener tapes 20A and 20B. The slide fastener 10 is a waterstop slide fastener, and a waterstop film is attached to upper surfaces of the fastener tapes 20A and 20B.

[0072] The fastener element rows 30A and 30B are coil-shaped fastener element rows formed by winding monofilaments made of a synthetic resin in a certain direction, and form a plurality of fastener elements 31. Examples of a synthetic resin material of the monofilament include polyester and nylon.

[0073] The fastener element rows 30A and 30B are sewn to lower surfaces (back surfaces) of the tape side-edge portions 21 of the fastener tapes 20A and 20B by sewing threads (not shown). The slide fastener 10 is a knitted fastener also described in the related art, and the knitted fastener is obtained by knitting the fastener tapes 20A and 20B and knitting coil-shaped fastener element rows into the tape side-edge portions 21 of the fastener tapes 20A and 20B at the same time.

[0074] The slider 40 includes a slider body 41 and a pull tab 42 attached to an upper surface of the slider body 41. The left and right fastener element rows 30A and 30B mesh with each other when the slider 40 is moved toward upper stop portion 11 side, and the left and right fastener element rows 30A and 30B are separated when the slider 40 is moved toward the opening device 60 side. The slider 40 is a slider with an automatic stop function in the present embodiment, but may be a slider without the automatic stop function.

[0075] As shown in FIG. 2, the body 41 includes an upper blade 43 and a lower blade 44 that are disposed in parallel to be spaced apart from each other in an upper-lower direction, a guide column 45 that connects the upper blade 43 to the lower blade 44 at a front end portions thereof, flanges 46a that protrude downward along both left and right side edge portions of the upper blade 43, flanges 46b that protrude upward along both left and right side edge portions of the lower blade 44, and a raised portion 47 that is formed on a lower surface of the upper blade 43 and guides the left and right fastener element rows 30A and 30B. A substantially Y-shaped element guide path 48 through which the left and right fastener element rows 30A and 30B are inserted is formed between the upper blade 43 and the lower blade 44. A tape groove 49 through which the fastener tapes 20A and 20B are inserted is formed between the upper and lower flanges 46a and 46b. The flange may be formed on at least one of the upper blade 43 and the lower blade 44. For example, in a reverse-opening slide fastener as shown in FIG. 1 in which the fastener element rows 30A and 30B are disposed on the lower surface sides of the fastener tapes 20A and 20B, the flange may be provided only on the lower blade 44 of the slider.

[0076] The left and right flanges 46a and 46b are formed to guide inversion portions 33 of the fastener elements 31 in a separated state on a shoulder mouth side of the element guide path 48 and guide the inversion portions 33 of the fastener elements 31 in a meshing state on a backward opening side of the element guide path 48 (see FIG. 7A).

[0077] As shown in FIG. 7A, inner surfaces of the left and right flanges 46a and 46b have parallel portions 46b1 extending from the backward opening and parallel to each other, curved portions 46b2 curved to be separated from each other from the parallel portions 46b1 to the shoulder mouth side, and linear portions 46b3 extending to be further separated from each other from the curved portions 46b2 to the shoulder mouth side. Although only the flange 46b of the lower blade 44 is shown in FIG. 7A, the flange 46a of the upper blade 43 also has the same shape in a top view, and includes a parallel portion, a curved portion, and a linear portion. In FIG. 7A, two-dot chain lines indicate boundary positions of the parallel portion 46b1, the curved portion 46b2, and the linear portion 46b3.

[0078] Referring back to FIG. 1, the opening device 60 includes a box pin 61 and a box body 62 disposed on one of the left and right fastener element rows 30A and 30B, that is, on a back end side of the fastener element 30A, and a separable pin 70 disposed on another of the left and right fastener element rows 30A and 30B, that is, on a back end side of the fastener element 30B, and insertable into the box body 62.

[0079] The separable pin 70 is attached to a back end portion of the tape side-edge portion 21 of the fastener tape 20A by injection molding. As shown in FIG. 3, the separable pin 70 includes a separable pin main body portion 71 having a prismatic shape, a lateral protruding portion 72 on a front side of the separable pin main body portion 71 and protruding further toward the box pin 61 side from a side surface 71a on a box pin side of the separable pin main body portion 71 facing the box pin 61, and a front protruding portion 73 protruding forward from a front surface 71b of the separable pin main body portion 71.

[0080] A meshing portion 74 that is closest to the box pin 61 and can mesh with a meshing head portion 32 of a backmost element 31a of the one fastener element row 30A is formed in front of the lateral protruding portion 72. An accommodation portion 75 that accommodates a back half portion of the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is provided between the meshing portion 74 and the front protruding portion 73. Further, a fitting recess 76 is formed at the back of the lateral protruding portion 72 by cutting out the upper surface side. Further, a stepped surface 77 may be formed along the front-back direction in an intermediate portion in a width direction of the lateral protruding portion 72 and the meshing portion 74. When the separable pin 70 is pulled out from the slider 40, if a lock pin of the slider 40 falls between the meshing portion 74 and the meshing head portion 32 of the backmost element 31a, it becomes difficult to pull out the separable pin 70. Since the stepped surface 77 is formed, the lock pin is less likely to fall between the meshing portion 74 and the meshing head portion 32, and the separable pin 70 can be easily pulled out from the slider 40.

[0081] The front protruding portion 73 has a bulging portion 73a that bulges toward a side opposite the box pin 61 from the side surface 71b that is on a side opposite the box pin of the separable pin main body portion 71, and is connected to the side surface 71b on the side opposite the box pin from the bulging portion 73a via a concave curved surface 73b. The bulging portion 73a can come into contact with the flange 46b when the slider 40 to be described later is pulled up (see FIG. 7B), prevents the separable pin 70 from moving in a direction away from the box pin 61, and acts to properly engage the engagement head portion 32 of the backmost element 31a of the one fastener element row 30A with the meshing portion 74.

[0082] In the present embodiment, the box pin 61 and the box body 62 are integrally formed by injection molding and attached to the back end portion of the tape side-edge portion 21 of the fastener tape 20A. However, the box pin 61 and the box body 62 may be formed separately, and the box pin 61 may be attached to the box body 62.

[0083] As shown in FIGS. 4 to 6, on a side surface of the box pin 61 on a separable pin side, an engaging portion 63 whose upper surface side protrudes and which is inserted into the fitting recess 76 of the separable pin 70 is formed, and a step portion 64 into which the lateral protruding portion 72 is fitted is formed in front of the engaging portion 63. Further, a standing surface 61a along the front-back direction of the slide fastener 10 is formed on a side surface that is on a side opposite the separable pin side of the box pin 61 so as to face the inner surfaces of the flanges 46a and 46b of the slider 40. The standing surface 61a may be a flat surface extending substantially vertically from a front surface 65a of a box body main body portion 65 toward the front side. A curved surface that is curved and forms a tip end of the box pin 61 is connected to the front side of the standing surface 61a.

[0084] The box body 62 is formed in a substantially rectangular parallelepiped shape, and includes a box body main body portion 65 having side surfaces that are parallel to each other on both sides in the width direction and that are along the front-back direction of the slide fastener 10, and an extending portion 66 provided in front of the box body main body portion 65 and extending forward from inside an outer surface of the box body main body portion 65. Therefore, as shown in FIG. 5, a width W1 of the extending portion 66 is smaller than a width of the box body main body portion 65.

[0085] On one side in a width direction of the box body 62, the box pin 61 is integrally formed, and on another side in the width direction of the box body 62, a separable pin insertion hole 67 penetrating in the front-back direction and also opening to a side surface is formed. Accordingly, the separable pin 70 can be inserted into the separable pin insertion hole 67 on the other side in the width direction of the box body 62.

[0086] An inclined surface 68 inclined backward from the box pin 61 side toward a separable pin insertion hole 67 side is formed in front of the extending portion 66, that is, on a front surface of the box body 62. An inclination angle of the inclined surface 68 is inclined in a range of 5 degrees to 12 degrees with respect to the width direction in which the left and right fastener element rows 30A and 30B are arranged. In the present embodiment, a position where the inclined surface 68 is at the same height as the front surface 65a of the box body main body portion 65 is referred to as an end portion 68a on a separable pin insertion hole side. The end portion 68a on the separable pin insertion hole side is connected to the front surface 65a of the box body main body portion 65.

[0087] Accordingly, the box pin 61 is provided to protrude forward from the inclined surface 68 of the extending portion 66 on the one side in the width direction of the box body 62.

[0088] As shown in FIG. 6, a length L1 of a portion of the box pin 61 protruding from the box body 62 is set to 35% to 45% of the length L from a bottom surface 67a of the separable pin insertion hole 67 of the box body 62 to the tip end of the box pin 61 in the longitudinal direction of the box pin 61.

[0089] In the slide fastener 10 configured as described above, when the slide fastener 10 is closed by mesh the pair of fastener element rows 30A and 30B together, first, the slider 40 is pulled down until the slider 40 is brought into contact with the inclined surface 68, which is the front surface of the box body 62.

[0090] Here, as illustrated in FIG. 7A, since the backmost element 31a of the one fastener element row 30A is in a state of being more deeply inserted into a backward opening side of the slider 40, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A approaches the element guide path 48 on a separable pin 70 side. That is, in the top view, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A approaches the element guide path 48 on the separable pin 70 side beyond an extension line X of a side surface of the engaging portion 63 of the box pin 62 in the left-right direction.

[0091] However, the flanges 46a and 46b on the box pin side are separated from the box body main body portion 65 compared to the flanges 46a and 46b on the separable pin side, and the slider 40 is inclined with respect to the front surface of the box body main body portion 65, that is, the width direction in which the left and right fastener element rows 30A and 30B are arranged.

[0092] Accordingly, since the element guide path 48 on the separable pin 70 side is inclined in a direction away from the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A, the element guide path 48 on the separable pin 70 side can be widely secured. Accordingly, collision between the meshing portion 74 of the separable pin 70 and the meshing head portion 32 of the backmost element 31b is minimized, and the separable pin 70 is smoothly inserted into the separable pin insertion hole 67 of the box body 62 via the element guide path 48 of the slider 40.

[0093] By setting the inclination angle 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 arranged, the element guide path 48 on the separable pin 70 side described above can be widely secured when the separable pin 70 is inserted. Further, by setting the inclination angle 0 to 12 degrees or less, the element guide path 48 on the separable pin 70 side and the separable pin insertion hole 67 of the box body 62 are prevented from bending significantly, making it difficult to insert the separable pin 70.

[0094] Then, as shown in FIG. 7A, a state in which the separable pin 70 is inserted into the separable pin 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 is a pull-up start position of the slider 40 at which the slider 40 is pulled up.

[0095] At the pull-up start position, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is in contact with the meshing portion 74 provided on the separable pin 70.

[0096] In the present embodiment, at the pull-up start position of the slider 40, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is in contact with the meshing portion 74 provided on the separable pin 70, but may be close to the meshing portion 74 without being in contact with the meshing portion 74. Here, the fact that the meshing head portion 32 of the backmost element 31a is close to the meshing portion 74 provided on the separable pin 70 means that a distance DI between the meshing head portion 32 of the backmost element 31a and the meshing portion 74 of the separable pin 70 is shorter than a distance D2 between the meshing head portion 32 of the backmost element 31a and the guide column 45 in a top view as shown in FIG. 8.

[0097] As described above, at the pull-up start position of the slider 40, the backmost elements 31a and 31b of the pair of fastener element rows 30A and 30B are in a state of being more deeply inserted into the backward opening side of the slider. In this state, the entire standing surface 61a of the box pin 61 formed on the side surface opposite the side facing the separable pin 70 faces the parallel portions 46b1 of the flange portions 46a and 46b. Further, the inversion portion 33 of the backmost element 31a of the one fastener element row 30A is guided by the curved portions 46b2 of the flange portions 46a and 46b.

[0098] Here, in the slide fastener 10 of the present embodiment, since the waterstop film is attached to the fastener tapes 20A and 20B, force is required to pull up the slider 40 at the pull-up start position of the slider 40, and when an attempt is made to pull up the slider 40, the slider 40 is twisted toward the box pin side in the order of FIGS. 7B and 7C, starting from a connection portion 69 between the inclined surface 68 and the standing surface 61a of the box pin 61.

[0099] At this time, at the pull-up start position of the slider, the backmost element 31a of the one fastener element row 30A comes into contact with the flange portions 46a and 46b, and the meshing head portion 32 of the backmost element 31a comes close to or comes into contact with the meshing portion 74 provided on the separable pin 70. Further, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is not in contact with the meshing head portion 32 of the backmost element 31b of the other fastener element row 30B, but is closer to each other than in the case of the slide fastener in the related art shown in FIG. 13A.

[0100] Accordingly, when the slider 40 is twisted, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is also in a state of being in contact with the meshing head portion 32 of the backmost element 31b of the other fastener element row 30B pressed by the flange portions 46a and 46b, as illustrated in FIG. 7B, while being in contact with the meshing portion 74 provided on the separable pin 70. Then, when the slider 40 is further twisted, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is in a state of passing between the meshing portion 74 and the meshing head portion 32 of the backmost element 31b of the other fastener element row 30B and in a meshing state. Therefore, the meshing head portions 32 of the backmost elements 31a and 31b are prevented from colliding with each other and not being properly engaged with each other, and then the slider 40 is smoothly pulled up.

[0101] As described above, according to the slide fastener 10 of the present embodiment, at the pull-up start position of the slider 40, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is close to or in contact with the meshing portion 74 provided on the separable pin 70. Accordingly, even when the slider 40 is twisted, the backmost elements 31a and 31b of the pair of fastener element rows 30A and 30B can be prevented from colliding with each other and not being properly engaged with each other, operability when the slider 40 is pulled up can be improved.

[0102] According to the opening device 60 for the slide fastener of the present embodiment, the length LI of the portion of the box pin 61 protruding from the box body 62 is set to 35% to 45% of the length L from the bottom surface 67a of the separable pin insertion hole 67 of the box body 62 to the tip end of the box pin 61 in the longitudinal direction of the box pin 61. That is, by shortening the length of the box pin 61 so that the length L1 of the box pin 61 is equal to or less than 45% of the length L, the backmost element 31a of the one fastener element row 30A is in a state of being more deeply inserted into the backward opening side of the slider 40 at the pull-up start position of the slider 40. Accordingly, even when the slider 40 is twisted when pulled up, the backmost elements 31a and 31b of the pair of fastener element rows 30A and 30B can be prevented from colliding with each other and not being properly engaged with each other, and operability when the slider 40 is pulled up can be improved. On the other hand, by setting the length L1 of the box pin 61 to 35% or more of the length L, the insertability of the separable pin 70 and the appearance of the box body 62 can be maintained.

[0103] The present invention is not limited to the above embodiments, and can be appropriately changed without departing from the gist of the present invention.

[0104] For example, in a first modification illustrated in FIG. 9A, the extending portion 66 of the box body 62 is configured to have side surfaces along the front-back direction of the slide fastener 10 on both the box pin 61 side and the separable pin insertion hole 67 side.

[0105] In this case, compared to the above embodiments, the length L1 of the portion of the box pin 61 protruding from the box body 62 becomes shorter, and a ratio of the length L1 of the box pin 61 to the length L from the bottom surface 67a of the separable pin insertion hole 67 of the box body 62 to the tip end of the box pin 61 in the longitudinal direction of the box pin 61 becomes smaller. Accordingly, at the pull-up start position of the slider 40, the backmost element 31a of the one fastener element row 30A is in a state of being more deeply inserted into the backward opening side of the slider 40, and the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is more likely to come close to or come into contact with the meshing portion 74 provided on the separable pin 70.

[0106] In a second modification illustrated in FIG. 9B, the box body 62 may have a configuration in which the inclined surface 68 is formed on the front surface of the box body main body portion 65 by elongating the box body main body portion 65 in the longitudinal direction of the box pin 61 without providing the extending portion 66.

[0107] Also in this case, as in the first modification, the length L1 of the portion of the box pin 61 protruding from the box body 62 becomes shorter, and a ratio of the length L1 of the box pin 61 to the length L from the bottom surface 67a of the separable pin insertion hole 67 of the box body 62 to a tip end of the box pin 61 in the longitudinal direction of the box pin 61 becomes smaller.

[0108] Further, in a third modification illustrated in FIG. 10, in the box body 62, the extending portion 66 is not provided and the box body main body portion 65 is elongated in the longitudinal direction of the separable pin 61, and a front surface of the box body main body portion 65 is formed along the width direction of the box body 62 without having the inclined surface 68.

[0109] In this case, similarly to the above embodiments, a ratio of the length LI of the box pin 61 to the length L from the bottom surface 67a of the separable pin insertion hole 67 of the box body 62 to a tip end of the box pin 61 in the longitudinal direction of the box pin 61 is set to 35% to 45%. Accordingly, as illustrated in FIG. 11A, at the pull-up start position of the slider 40, the backmost element 31a of the one fastener element row 30A is in a state of being more deeply inserted into a backward opening side of the slider 40, and the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is in a state of being close to or in contact with the meshing portion 74 provided on the separable pin 70.

[0110] Further, as illustrated in FIG. 11B, even when the slider 40 is twisted, the meshing head portion 32 of the backmost element 31a of the one fastener element row 30A is in a state of passing between the meshing portion 74 and the meshing head portion 32 of the backmost element 31b of the other fastener element row 30B and in a meshing state, while being in contact with the meshing portion 74 provided on the separable pin 70. Therefore, the meshing head portions 32 of the backmost elements 31a and 31b are prevented from colliding with each other and not being properly engaged with each other, and then the slider 40 is smoothly pulled up.

[0111] In the case of a configuration in which the box body 62 has no inclined surface as in the third modification, in order to ensure the insertability of the separable pin 70 into the box body 62, the separable pin 70 may be configured such that a concave curved surface 73b is further recessed to thin the separable pin 70 while maintaining a width of the bulging portion 73a of the front protruding portion 73.

[0112] In a fourth modification illustrated in FIG. 12, the box body 62 has no inclined surface as in the third modification, but the box body 62 has a box body main body portion 65 and an extending portion 66 as in the above embodiment. Therefore, the front surface of the extending portion 66 is parallel to the front surface of the box body main body portion 65 and is formed along a width direction of the box body 62.

[0113] Further, in the above embodiments, an example was given of the case where the present invention is applied to a reverse-opening slide fastener in which the fastener element rows are disposed on the lower surface sides of the fastener tape, but the present invention is not limited thereto, and may also be applied to a front-opening slide fastener in which the fastener element rows are disposed on upper surface sides of the fastener tape.

[0114] Further, in the above embodiments, the opening device of the present invention is applied to the waterstop slide fastener in which the waterstop film is attached to a knitted fastener, but the present invention is not limited thereto, and can be suitably applied to a slide fastener in which a slider tends to be twisted when pulled up.

[0115] As described above, the following matters are disclosed in this specification. [0116] (1) A slide fastener including: [0117] a pair of fastener stringers having a pair of fastener tapes and a pair of fastener element rows respectively provided on facing tape side-edge portions of the pair of fastener tapes; [0118] an opening device including a box pin and a box body disposed on a back end side of one of the pair of fastener element rows, and a separable pin disposed on a back end side of another of the pair of fastener element rows; and [0119] a slider including an upper blade and a lower blade disposed in parallel to be spaced apart from each other in an upper-lower direction, a guide column connecting the upper blade to the lower blade at front end portions thereof, and a flange portion provided on a back side-edge portion of at least one of the upper blade and the lower blade, and configured to mesh together and separate the pair of fastener element rows, in which [0120] the box body is provided with the box pin protruding forward from the box body on one side in a width direction where the pair of fastener element rows are arranged, and a separable pin insertion hole into which the separable pin is insertable is formed on another side in the width direction, [0121] the separable pin has a meshing portion configured to be engaged with a meshing head portion of a backmost element of the one of the fastener element rows, and [0122] when the separable pin is inserted into the separable pin insertion hole of the box body and the slider is at a pull-up start position of the slider in contact with a front surface of the box body, the meshing head portion of the backmost element of the one of the fastener element rows is close to or in contact with the meshing portion provided on the separable pin.

[0123] According to this configuration, even when the slider is twisted when pulled up, the backmost elements of the pair of fastener element rows can be prevented from colliding with each other and not being properly engaged with each other, and operability when the slider is pulled up can be improved. [0124] (2) The slide fastener according to (1), in which [0125] the front surface of the box body has an inclined surface inclined backward from a side of the box pin toward a side of the separable pin insertion hole, and [0126] the slider is inclined with respect to the width direction in which the pair of fastener element rows are arranged at the pull-up start position of the slider.

[0127] According to this configuration, in a state where the slider is in contact with the inclined surface that is the front surface of the box body, collision between the meshing portion of the separable pin and the meshing head portion of the backmost element of the other of the fastener element rows can be minimized, and the separable pin can be smoothly inserted into the separable pin insertion hole of the box body. [0128] (3) The slide fastener according to (2), in which [0129] the inclined surface is inclined in a range of 5 degrees to 12 degrees with respect to the width direction in which the pair of fastener element rows are arranged.

[0130] According to this configuration, the separable pin can be smoothly inserted into the separable pin insertion hole of the box body in the state where the slider is in contact with the inclined surface that is the front surface of the box body. [0131] (4) The slide fastener according to (2) or (3), in which [0132] the box body includes a box body main body portion provided with the separable pin insertion hole, and an extending portion continuous from the box body main body portion and forming the front surface of the box body, [0133] a width of the extending portion is smaller than a width of the box body main body portion, and [0134] an end portion on a separable pin insertion hole side of the inclined surface is connected to a front surface of the box body main body portion.

[0135] According to this configuration, at the end portion on the separable pin insertion hole side of the inclined surface, since the inclined surface is connected to the front surface of the box body main body portion without a step, a size of the extending portion can be reduced, and appearance of the box body can be maintained as much as possible. [0136] (5) The slide fastener according to any one of (1) to (3), in which [0137] the box body includes a box body main body portion provided with the separable pin insertion hole, and an extending portion continuous from the box body main body portion and forming the front surface of the box body, and [0138] a width of the extending portion is smaller than a width of the box body main body portion.

[0139] According to this configuration, the appearance of the box body can be maintained as much as possible by reducing the size of the extending portion while making the size of the box body main body portion the same as that of a product in the related art. [0140] (6) The slide fastener according to any one of (1) to (5), in which [0141] the slider includes parallel portions extending from a backward opening and parallel to each other on an inner surface of the flange portion, [0142] the box pin has a standing surface along a front-back direction of the slide fastener on a side surface opposite a side facing the separable pin, and [0143] the entire standing surface of the box pin faces the parallel portions of the flange portion at the pull-up start position of the slider.

[0144] According to this configuration, at the pull-up start position of the slider, the backmost element of the one fastener element row is in a state of being more deeply inserted into a backward opening side of the slider, and the meshing head portion of the backmost element of one of the fastener element rows is likely to come close to or come into contact with the meshing portion provided on the separable pin. [0145] (7) An opening device for a slide fastener, including: [0146] a box pin and a box body configured to be disposed on a back end side of one of a pair of fastener element rows; and [0147] a separable pin configured to be disposed on a back end side of another of the pair of fastener element rows, in which [0148] the box body is provided with the box pin protruding forward from the box body on one side in a width direction of the box body, and a separable pin insertion hole into which the separable pin is insertable is formed on another side in the width direction of the box body, and [0149] a length of a portion of the box pin protruding from the box body is 35% to 45% of a length from a bottom surface of the separable pin insertion hole of the box body to a tip end of the box pin in a longitudinal direction of the box pin.

[0150] According to this configuration, a backmost element of one of the fastener element rows is in a state of being more deeply inserted into a backward opening side of the slider at the pull-up start position of the slider, and even in a case where the slider is twisted when pulled up, the backmost elements of the pair of fastener element rows can be prevented from colliding with each other and not being properly engaged with each other, and operability when the slider is pulled up can be improved. [0151] (8) The opening device for the slide fastener according to (7), in which [0152] a front surface of the box body has an inclined surface inclined backward from a side of the box pin toward a side of the separable pin insertion hole.

[0153] According to this configuration, in a state where the slider is in contact with the inclined surface that is the front surface of the box body, collision between the meshing portion of the separable pin and the meshing head portion of the backmost element of the other of the fastener element rows can be minimized, and the separable pin can be smoothly inserted into the separable pin insertion hole of the box body. [0154] (9) The opening device for the slide fastener according to (8), in which [0155] the inclined surface is inclined in a range of 5 degrees to 12 degrees with respect to the width direction of the box body.

[0156] According to this configuration, the separable pin can be smoothly inserted into the separable pin insertion hole of the box body in the state where the slider is in contact with the inclined surface that is the front surface of the box body. [0157] (10) The opening device for the slide fastener according to (8) or (9), in which [0158] the box body includes a box body main body portion provided with the separable pin insertion hole, and an extending portion continuous from the box body main body portion and forming the front surface of the box body, [0159] a width of the extending portion is smaller than a width of the box body main body portion, and [0160] an end portion on a separable pin insertion hole side of the inclined surface is connected to a front surface of the box body main body portion.

[0161] According to this configuration, at the end portion on the separable pin insertion hole side of the inclined surface, the inclined surface is connected to the front surface of the box body main body portion without a step, so that the size of the extending portion can be reduced, and the appearance of the box body can be maintained as much as possible. [0162] (11) The opening device for the slide fastener according to any one of (7) to (9), in which [0163] the box body includes a box body main body portion provided with the separable pin insertion hole, and an extending portion continuous from the box body main body portion and forming a front surface of the box body, and [0164] a width of the extending portion is smaller than a width of the box body main body portion.

[0165] According to this configuration, the appearance of the box body can be maintained as much as possible by reducing the size of the extending portion while making the size of the box body main body portion the same as that of a product in the related art.

REFERENCE SIGNS LIST

[0166] 10: slide fastener [0167] 11: upper stop portion [0168] 20A, 20B: fastener tape [0169] 21 tape side-edge portion [0170] 22A, 22B: fastener stringer [0171] 30A, 30B: fastener element row [0172] 31: fastener element [0173] 40: slider [0174] 43: upper blade [0175] 44: lower blade [0176] 45: guide column [0177] 46a, 46b: flange portion [0178] 60: opening device [0179] 61: box pin [0180] 61a: standing surface [0181] 62: box body [0182] 65: box body main body portion [0183] 66: extending portion [0184] 67: separable pin insertion hole [0185] 68: inclined surface [0186] 70: separable pin [0187] 74: meshing portion cm 1. A slide fastener comprising: [0188] a pair of fastener stringers having a pair of fastener tapes and a pair of fastener element rows respectively provided on facing tape side-edge portions of the pair of fastener tapes; [0189] an opening device including a box pin and a box body disposed on a back end side of one of the pair of fastener element rows, and a separable pin disposed on a back end side of another of the pair of fastener element rows; and [0190] a slider including an upper blade and a lower blade disposed in parallel to be spaced apart from each other in an upper-lower direction, a guide column connecting the upper blade to the lower blade at front end portions thereof, and a flange portion provided on a back side-edge portion of at least one of the upper blade and the lower blade, and configured to mesh together and separate the pair of fastener element rows, wherein [0191] the box body is provided with the box pin protruding forward from the box body on one side in a width direction where the pair of fastener element rows are arranged, and a separable pin insertion hole into which the separable pin is insertable is formed on another side in the width direction, [0192] the separable pin has a meshing portion configured to be engaged with a meshing head portion of a backmost element of the one of the fastener element rows, and [0193] when the separable pin is inserted into the separable pin insertion hole of the box body and the slider is at a pull-up start position of the slider in contact with a front surface of the box body, the meshing head portion of the backmost element of the one of the fastener element rows is close to or in contact with the meshing portion provided on the separable pin.