Slide fastener

Abstract

This slide fastener includes: a pair of element rows 4 adjacent to each other in a width direction; a reverse opening tool 10 composed of a pair of rod members 5a, 5b arranged separately on a rear side with respect to the pair of element rows; a pair of string members for separately fixing the pair of element rows and the pair of rod members at the same positions in the width direction; and a pair of sliders 8A, 8B. The rod member includes a rod body 50a, 50b fixed to the string member, a fin 60a, 60b protruding to the outside in the width direction from the rod body and on which fabric 7 is placed, and a tooth row 80A, 80B composed of three or more teeth 81a-, 81b-, protruding inward in the width direction from the rod body and longitudinally spaced from each other. When sewing the fabric, a gear for conveying the element row meshes with an inner part in the width direction of the element row and the teeth of the tooth row. In the tooth row, the amount of protrusion inward in the width direction with respect to the string member becomes smaller as the teeth are positioned rearward. Due to the shape of the tooth row, a connection column of the slider at the rear hardly hits the tooth row, and the operability is improved.

Description

Slide fastener

[0001] The present invention relates to a slide fastener having a reverse opening device.

[0002] Some slide fasteners use string members to fasten an element row made up of multiple elements. In this case, the element row is conveyed while meshing with a conveying gear, and fabric aligned with the element row is sewn to the string members (Patent Document 1).

[0003] More specifically, the slide fastener disclosed in Patent Document 1 includes a pair of string members, a pair of element rows fixed to the pair of string members, an insert pin fixed to the string members at the rear of one of the element rows, a box pin fixed to the string members at the rear of the other element row, and a box body fixed to the box pin. The insert pin, box pin, and box body cooperate to form a single opening device.

[0004] The insert pin and box pin each have a rod body extending forward and backward, a fin that projects outward in the width direction from the rod body, and a portion that projects inward in the width direction relative to the rod body. This protruding portion has teeth that mesh with the conveying gear when sewing fabric, and is made up of two protruding teeth spaced apart from each other in the front and back.

[0005] Furthermore, there is a type of opening device called a reverse opening device, which is composed of an insert pin and a box pin. A slide fastener equipped with a reverse opening device has a pair of sliders (Patent Document 2). In the slide fastener disclosed in Patent Document 2, the element row is fixed to the fastener tape, not to the string member. A fabric is sewn to the fastener tape at a distance from the element row in the width direction.

[0006] JP 2022-38070 A Patent No. 4307413 A

[0007] In the reverse opening device disclosed in Patent Document 2, when the two sliders are moved toward the reverse opening device until they can no longer move, the insert pin can be inserted and removed from the two sliders. When the insert pin is inserted into the reverse opening device, the insert pin's rod body is housed inside the two sliders. On the other hand, in the opening device disclosed in Patent Document 1, when the insert pin's rod body is inserted into the box body, the insert pin's rod body is housed inside one slider. Therefore, the length of the insert pin's rod body in the front-to-rear direction is longer in the reverse opening device than in the opening device.

[0008] The opening tool disclosed in Patent Document 1 has two teeth that mesh with a conveying gear when sewing fabric. Based on the opening tool disclosed in Patent Document 1, a reverse opening tool is designed that includes an insert pin fixed to one string member and a box pin fixed to the other string member. In this case, the length of the insert pin and box pin rod bodies of the reverse opening tool is longer than that of the opening tool, so the number of teeth protruding from the rod bodies needs to be greater than that of the opening tool.

[0009] As is well known, a slider connects the upper and lower blades with a connecting post. In the case of a reverse opening tool, when the rear slider is moved away from the reverse opening tool, the rod body of the insert pin and the rod body of the box pin pass through the interior of the rear slider while tilting in the front-to-rear direction. As the pair of rod bodies pass through the interior of the rear slider, the teeth of the insert pin and the teeth of the box pin face toward the connecting post. If the teeth of the insert pin and the teeth of the box pin strongly contact the connecting post inside the rear slider, a large force is required to move the rear slider, making it difficult to operate. Furthermore, in a reverse opening tool, when inserting or removing the insert pin, if the teeth of the insert pin contact the connecting post of the front slider, it becomes difficult to insert or remove the insert pin.

[0010] The present invention has been created in consideration of the above-mentioned circumstances, and its object is to improve the operability of the subsequent sliders and make it easier to insert and remove the insert pins into and from the pair of sliders.

[0011] The slide fastener of the present invention comprises a pair of element rows, a pair of string members, a reverse opening device composed of a pair of rod members, and a pair of sliders. The pair of element rows is composed of a plurality of elements arranged in a single row in the front-to-rear direction and then arranged in two rows in the width direction. The pair of string members secure the pair of element rows separately while passing through the elements. The pair of sliders open and close the pair of element rows in opposite directions. The slider includes upper and lower blades that face each other in the vertical direction, and a connecting post that connects the upper and lower blades. The pair of rod members are separately fixed to the pair of string members on the rear side of the pair of element rows. Fabrics are separately attached to the insert pin as one rod member and the box pin as the other rod member. When the pair of sliders accommodate the insert pin and the box pin, the insert pin can be removed from the pair of sliders. The slide fastener is based on the above assumptions.

[0012] The rod member has a rod body, a fin, and a tooth row. The rod body is fixed to the rear end of the string member and can be housed in the slider. The fin protrudes outward in the width direction from the rod body and is used to place the fabric. The tooth row is composed of three or more teeth protruding inward in the width direction from the rod body and spaced apart in the front and rear directions. The inner side of the element row in the width direction meshes with the inner side of the opposing element row in the width direction and meshes with a conveying gear for conveying the element row when sewing fabric along the element row. The teeth at least partially overlap the teeth of the opposing rod member in the vertical direction and mesh with the conveying gear. The slide fastener of the present invention is characterized in that the tooth row protrudes less inward in the width direction relative to the string member as it is positioned further back.

[0013] Furthermore, in the case of the butterfly pin, if a simulated tooth simulating the outer shape of the tooth immediately preceding it is placed at the position of the rearmost tooth, the rear surface of the rearmost tooth may be configured to coincide with the rear surface of the simulated tooth. However, in order to make it difficult for the rearmost tooth of the butterfly pin to hit the connecting pillar of the rear slider when the rear slider is moved forward from a state in which it has collided with the reverse-opening tool, thereby improving the operability of the rear slider, it is desirable to do the following: In the case of the butterfly pin, if a simulated tooth simulating the outer shape of the tooth immediately preceding it is placed at the position of the rearmost tooth, the rear surface of the rearmost tooth should be located further forward than the rear surface of the simulated tooth.

[0014] The rear surface of the rearmost tooth of the insert pin is located forward of the rear surface of the dummy tooth, so that when the rear slider is operated, it is less likely to hit the connecting post, and as a result, the operability of the rear slider is improved.

[0015] The insert pin teeth and the box pin teeth may be unable to move parallel to the outside in the width direction as long as they overlap in the vertical direction, but in this configuration, when the insert pin teeth and the box pin teeth move outward in the width direction by operating the rear slider, the teeth rub against each other on surfaces other than where they overlap, making them prone to damage.To make the teeth less susceptible to damage, it is desirable to do the following: The insert pin teeth and the box pin teeth should overlap at least partially in the vertical direction so that they can move parallel to the outside in the width direction.

[0016] The insert pin may or may not mesh with the rearmost element on the box pin side, but in order to improve the unity of the element row on the box pin side with the box pin while maintaining the operability of the rear slider, it is desirable to do as follows: The front part of the foremost tooth of the insert pin and the front end part of the pin body of the insert pin cooperate to form a semi-mesh part that meshes with the rearmost element on the box pin side. In addition, the rear part of the foremost tooth of the insert pin is made to be a first rear tooth part that protrudes rearward from the rear surface of one of the upper and lower parts of the semi-mesh part and overlaps vertically with the foremost tooth on the box pin side.

[0017] The foremost tooth of the insert pin and the foremost tooth of the box pin are preferably configured as follows to enhance the unity of the insert pin and the box pin while maintaining the operability of the rear slider. The foremost tooth of the insert pin is configured so that the rear surface of the other of the upper and lower half-engagement portions and the rear surface of the first rear tooth portion are parallel to the width direction or inclined relative to the width direction while moving forward toward the inside in the width direction. The foremost tooth of the box pin includes an upper tooth portion that protrudes from the upper part of the inner side surface of the pin body of the box pin in the width direction and a lower tooth portion that protrudes from the lower part of the side surface. One of the upper tooth portion and the lower tooth portion has a front tooth portion that protrudes forward relative to the other of the upper tooth portion and the lower tooth portion and overlaps with the first rear tooth portion. The other of the upper tooth portion and the lower tooth portion has a second rear tooth portion that protrudes rearward relative to the one of the upper tooth portion and the lower tooth portion and overlaps with the second tooth from the front of the insert pin.

[0018] Regarding the box pin, the second and subsequent teeth from the front may or may not protrude from the same area of ​​the upper and lower sides as the area of ​​the rear tooth portion. However, to facilitate overlapping between the teeth of the insert pin and the teeth of the box pin, it is preferable that the second and subsequent teeth from the front of the box pin protrude from the area of ​​the upper and lower sides as the area of ​​the second rear tooth portion.

[0019] In the slide fastener of the present invention, of all the teeth in the tooth row of the rod member, the rear tooth of two adjacent teeth in the front and rear directions has a smaller amount of inward protrusion in the width direction relative to the string member than the front tooth.Therefore, when the rear slider is moved forward from a state in which it has collided with the reverse opening device, the amount of outward movement in the width direction of the insert pin and box pin when the tooth hits the connecting post of the rear slider gradually increases each time the tooth hitting the connecting post changes to the front tooth, and the rod body of the insert pin and the rod body of the box pin gradually tilt in the front-to-back direction inside the rear slider, improving the operability of the rear slider.

[0020] Furthermore, when inserting an insert pin into a pair of sliders, at the beginning of insertion, the rear portion of the insert pin's rod body and the front portion of the box pin's rod body face each other in the width direction inside the pair of sliders, while the insert pin is most tilted in the front-to-back direction. At this stage, the rearmost tooth of the insert pin is most likely to come into contact with the connecting post of the preceding slider. However, since the rearmost tooth of the insert pin protrudes the least among the insert pin's teeth, it is less likely to come into contact with the connecting post, making it easier to insert the insert pin. Furthermore, as the insert pin is inserted, the inclination of the insert pin in the front-to-back direction decreases, and the teeth in front of the rearmost insert pin approach the connecting post in sequence, with the protrusion of the teeth gradually increasing toward the front, making it easier to insert the insert pin. Then, when insertion of the insert pin is complete, the insert pin and the box pin overlap more in the vertical direction toward the front of the teeth, and the insert pin and the box pin are stabilized inside the slider. When removing the insert pin from the pair of sliders, the procedure is reversed to that for inserting it, making it easier to remove.

[0021] 6A-6D are explanatory diagrams showing the relationship between the insert pin and the box pin when the rear slider is moved forward. (A)-(D) are explanatory diagrams showing the relationship between the insert pin and the box pin when the rear slider is moved forward. (A)-(D) are explanatory diagrams showing the relationship between the insert pin and the box pin when the insert pin is inserted into a pair of sliders ... 10 is an explanatory view showing a state in which an element member on the box pin side is conveyed, and FIG. 11 is an explanatory view showing a state in which a pair of element members pass through an assembly slider.

[0022] 1 shows a chain member 1 according to a first embodiment of the present invention. The chain member 1 extends in a straight line. The chain member 1 is composed of a pair of element members 2a, 2b that extend in a straight line and are meshed with each other in a parallel state. When the meshing of the pair of element members 2a, 2b is released, the pair of element members 2a, 2b separate.

[0023] In the following description, directions are defined as follows. The "front-rear direction" is the direction in which the chain member 1 extends in a straight line. The front-rear direction corresponds to the up-down direction in FIG. 1. The front direction corresponds to the up-down direction in FIG. 1. The rear direction corresponds to the down-down direction in FIG. 1. The "left-right direction" is the direction perpendicular to the up-down direction and the direction in which the pair of element members 2a, 2b are adjacent to each other. The left-right direction is also referred to as the width direction and corresponds to the left-right direction in FIG. 1. The left direction corresponds to the left direction in FIG. 1. The right direction corresponds to the right direction in FIG. 1. The "inner side in the width direction" refers to the right side of a portion of the left-side element member 2a, taking that portion as an example. The "outer side in the width direction" refers to the left side of a portion of the left-side element member 2a, taking that portion as an example. The "up-down direction" refers to the direction perpendicular to the front-rear direction and the left-right direction, and is also referred to as the thickness direction. The up-down direction refers to the direction perpendicular to the plane of the paper in FIG. 1. The upward direction is the direction facing the front side among directions perpendicular to the paper surface of Fig. 1. The downward direction is the direction facing the back side among directions perpendicular to the paper surface of Fig. 1.

[0024] The left-side element member 2a includes a string member 3 extending in the front-to-rear direction, an element row 4 fixed to the string member 3, an insert pin 5a as a rod member fixed to the string member 3 behind the element row 4, and a guide portion 6a fixed to the string member 3 behind the insert pin 5a. In the left-side element member 2a, the element row 4, insert pin 5a, and guide portion 6a are fixed to the string member 3 one by one in order toward the rear, but in reality, the element row 4, insert pin 5a, and guide portion 6a are fixed to the string member 3 in order toward the rear. The right-side element member 2b is substantially symmetrical to the left-side element member 2a except for the use of a box pin 5b as another rod member, and will be described briefly. The right-side element member 2b also includes a string member 3, an element row 4, a box pin 5b, and a guide portion 6b. The insert pin 5a and the box pin 5b form a single reverse opening device 10.

[0025] A pair of element rows 4 mesh with each other on the inside in the width direction, a pair of guide portions 6a, 6b mesh with each other on the inside in the width direction, and a pair of rod members, namely, an insert pin 5a and a box pin 5b, overlap each other in the vertical direction on the inside in the width direction, thereby integrating the pair of element members 2a, 2b to form a chain member 1.

[0026] The pair of guide portions 6a, 6b are interlockable and separable. The insert pin-side guide portion 6a is composed of multiple guide elements 16a lined up in a row in the front-rear direction. Each guide element 16a has a guide body 16a1 through which the string member 3 passes in the front-rear direction and a guide meshing portion 16a2 that protrudes inward in the width direction relative to the guide body 16a1. All of the guide elements 16a of the guide portion 6a may be of the same type and have the same shape, but in this embodiment, there are multiple types. The box pin-side guide portion 6b is also composed of multiple guide elements 16b lined up in a row in the front-rear direction. Each guide element 16b also has a guide body 16b1 through which the string member 3 passes in the front-rear direction and a guide meshing portion 16b2 that protrudes inward in the width direction relative to the guide body 16b1. All of the guide elements 16b of the guide portion 6b may be of the same type and have the same shape, but in this embodiment, there are multiple types. The guide meshing portion 16a2 on the insert pin side and the guide meshing portion 16b2 on the box pin side can be engaged with and separated from each other.

[0027] The string member 3 is flexible. Therefore, the string member 3 deforms between the element row 4 and the insert pin 5a or between the element row 4 and the box pin 5b. The string member 3 is, for example, a monofilament, a twisted yarn, or a string body. The string body is formed by wrapping a core yarn made of a plurality of drawn multifilaments in a bag knitted with a plurality of knitting yarns.

[0028] The element members 2a, 2b are conveyed toward the sewing machine, and fabric 7 (see FIG. 2) is sewn onto a portion of the element members 2a, 2b. After sewing, the portions of the element members 2a, 2b onto which the fabric 7 is not sewn are cut off. The portions of the element members 2a, 2b onto which the fabric 7 is sewn are called fastener stringers.

[0029] As shown in FIG. 3 , a slide fastener is completed by attaching a pair of sliders 8A, 8B to a pair of fastener stringers. The pair of sliders 8A, 8B can move back and forth along the pair of fastener stringers, opening and closing the pair of fastener stringers in opposite directions. The front slider 8A of the pair of sliders 8A, 8B moves forward when closing the pair of fastener stringers. The rear slider 8B of the pair of sliders 8A, 8B moves rearward when closing the pair of fastener stringers. When the pair of sliders 8A, 8B are adjacent to each other in the front and rear directions with their rear openings facing each other and the insert pin 5a and box pin 5b are accommodated, the insert pin 5a can be removed from the pair of sliders 8A, 8B. In other words, the insert pin 5a is the rod member that can be inserted and removed from the pair of sliders 8A, 8B. When the insert pin 5a can be inserted and removed, the rear slider 8B is located at the rear limit position of its movement range. The "rear opening" of the slider is the portion through which the pair of element rows 4 pass in an interlocked state. Specifically, the "rear" of the rear opening refers to the direction based on the front slider 8A. The "opening" of the rear opening refers to the portion through which the pair of element rows 4 enters from the outside to the inside of the slider.

[0030] The pair of sliders 8A, 8B have the same configuration except for their orientation. Hereinafter, the rear slider 8B will be described, and a description of the front slider 8A will be omitted. The rear slider 8B includes a slider body 21 that opens and closes the pair of element rows 4 and is movable back and forth along the pair of element rows 4, and a pull tab 29 that is connected to the slider body 21.

[0031] 4, the slider body 21 includes an upper blade 22 and a lower blade 23 that face each other and are spaced apart in the vertical direction, a connecting post 24 that connects the opposing rear portions of the upper blade 22 and the lower blade 23 at their respective left-right intermediate portions and is sandwiched between a pair of element rows 4, a pull-tab attachment portion 25 for attaching a pull tab 29, and flanges 26 that protrude from the left and right ends of the upper blade 22 and the lower blade 23 in a direction narrowing the opposing vertical gap between the upper blade 22 and the lower blade 23. In the drawing, the pull-tab attachment portion 25 protrudes from above the upper blade 22.

[0032] The lower surface of the upper blade 22 and the upper surface of the lower blade 23 face each other vertically. The upper surface of the lower blade 23 will be described in detail later. The flange 26 includes a parallel piece 26a that is parallel to the front-to-rear direction and an inclined piece 26b that continues rearward from the parallel piece 26a and is inclined relative to the front-to-rear direction. The inclined piece 26b is located on the outer side of the connecting post 24 in the width direction and is inclined relative to the front-to-rear direction, gradually moving outward in the width direction as it extends rearward. The left and right flanges 26 engage the insert pin-side element 40 and the box pin-side element 40 between the left and right parallel piece portions 26a, and separate the insert pin-side element 40 and the box pin-side element 40 between the left and right inclined piece portions 26b and the connecting post 24.

[0033] The slider body 21 is provided with an element passage 21a that penetrates in the front-rear direction and branches into two at the rear, and a dough groove 21b that communicates with the element passage 21a and opens to the left or right. The element passage 21a is vertically separated from the outside of the slider body 21 by the upper blade 22 and the lower blade 23. The element passage 21a is horizontally separated from the outside of the slider body 21 by the left and right flanges 26. The rear side of the element passage 21a is separated into left and right sections by the connecting pillars 24. The dough groove 21b is between the opposing flanges 26. A pair of element rows 4 is passed through the element passage 21a, and the dough 7 on the corresponding side is passed through each dough groove 21b. This completes the basic configuration of the slider 8B.

[0034] As shown in FIG. 1 , the element row 4 is composed of a plurality of elements 40 lined up in a line in the front-rear direction. In a pair of element rows 4, the plurality of elements 40 lined up in a line in the front-rear direction are lined up in two lines in the width direction. The plurality of elements 40 lined up in a line in the front-rear direction are fixed to the string member 3 with a gap between them in the front-rear direction. In the element row 4, the gap between adjacent elements 40 in the front-rear direction is the same. The elements 40 are formed by injection molding onto the string member 3. As a result, the string member 3 penetrates the plurality of elements 40 in the front-rear direction. The string member 3 also penetrates the guide elements 16a, 16b, the insert pin 5a, and the box pin 5b in the front-rear direction.

[0035] As shown in FIG. 5, the element 40 includes a body portion 41 through which the string member 3 passes in the front-rear direction, and a meshing portion 45 that meshes with the element 40 of the opposing element row 4.

[0036] The interlocking portion 45 protrudes inward in the width direction relative to the body portion 41. In this embodiment, the shape of the interlocking portion 45 is symmetrical from front to back, with the upper and lower portions of the interlocking portion 45 being different. The upper portion of the interlocking portion 45 is plate-shaped with its thickness in the up-down direction and has a triangular shape when viewed from above. The front surface 45a of the upper portion of the interlocking portion 45 is inclined in the left-right direction, tilting rearward as it moves inward in the width direction. The rear surface 45b of the upper portion of the interlocking portion 45 is inclined in the left-right direction, tilting forward as it moves inward in the width direction.

[0037] The lower portion of the interlocking portion 45 includes a neck portion 45d that protrudes inward in the width direction from the body portion 41, and a head portion 45e that protrudes inward in the width direction relative to the neck portion 45d and protrudes forward and backward. When viewed from above, the neck portion 45d is hidden by the upper portion of the interlocking portion 45 and cannot be seen. When viewed from above, the head portion 45e protrudes forward and backward relative to the upper portion of the interlocking portion 45. When viewed from below, the front surface 45d1 and the rear surface 45d2 of the neck portion 45d are symmetrically concave in a semicircular shape, while the front surface 45e1 and the rear surface 45e2 of the head portion 45e are symmetrically convex in a semicircular shape. The body portion 41 includes a front surface 41a and a rear surface 41b, an upper surface 41c and a lower surface 41d, and a side surface 41e on the outer side in the width direction. The string member 3 passes through the center of the front surface 41a and the rear surface 41b of the body portion 41. The upper surface 41c and the lower surface 41d of the body 41 are guided by the upper blade 22 and the lower blade 23, and the outer side surface 41e of the body 41 in the width direction is guided by the flange 26.

[0038] As shown in Figures 6 to 10, the insert pin 5a comprises a rod body 50a fixed to the string member 3, a fin 60a protruding from the outer side surface of the rod body 50a in the width direction, and a tooth row 80A consisting of a plurality of teeth 81a to 84a protruding from the inner side surface of the rod body 50a in the width direction.

[0039] The rod body 50a extends in the front-to-rear direction. The string member 3 penetrates the front surface 51a and rear surface 52a of the rod body 50a. In this case, the string member 3 is parallel to the front-to-rear direction. Furthermore, when the string member 3 is parallel to the front-to-rear direction, the rod body 50a is also parallel to the front-to-rear direction. The upper surface 53a and lower surface 54a of the rod body 50a are formed in planar shapes perpendicular to the vertical direction and are guided between the upper blade 22 and the lower blade 23. An inward recess 55a recessed inward in the width direction is formed in the middle of the outer side surface of the rod body 50a in the front-to-rear direction. A tooth guide 56a recessed upward is formed on the inner width portion of the lower surface of the rod body 50a. The tooth guide 56a guides the tooth row 80B (described later) of the box pin 5b when inserting and removing the insert pin 5a into and from the pair of sliders 8A and 8B. Details of the tooth guide 56a will be described later.

[0040] The fin 60a projects outward in the width direction relative to the rod body 50a. The fin 60a is located above the underside 54a of the rod body 50a and below the top surface 53a of the rod body 50a. A through-hole 61a that penetrates vertically is formed in the fin 60a at a position spaced apart from the outside in the width direction relative to the rod body 50a. The fabric 7 is placed on the fin 60a, and in this state, a sewing thread is passed through the through-hole 61a from above the fabric 7, and the fabric 7 is sewn to the fin 60a.

[0041] The tooth row 80A of the insert pin 5a has four teeth 81a to 84a that protrude from the rod body 50a at intervals in the front and rear directions. The four teeth 81a to 84a have smaller inward protrusions (maximum value) in the width direction relative to the string member 3, the further rearward the tooth. Therefore, with respect to the inner end in the width direction, the four teeth 81a to 84a are positioned in order from the forefront tooth 81a to the rearmost tooth 84a, and are positioned further outward in the width direction. The string member 3 serves as a reference for measuring the protrusion amount, and the inner end in the width direction of the string member 3 is indicated by a dotted line in FIG. 9 . Also, in FIG. 9 , the protrusion amounts of the four teeth 81a to 84a are indicated as a1 to a4.

[0042] The three teeth 82a-84a on the rear side of the insert pin 5a protrude inward in the width direction from the upper part of the inner side surface in the width direction of the rod body 50a. In other words, the protruding portions of the insert pin's teeth 82a-84a, from the second tooth from the front onwards, are all located at the upper part of the inner side surface in the width direction of the rod body 50a. The inner side surfaces of the three teeth 82a-84a in the width direction are parallel to the front-to-rear direction. The second tooth 82a from the front and the third tooth 83a from the front have trapezoidal shapes that are symmetrical from front to back. In Figure 9, a simulated tooth 84f, which simulates the outer shape of the tooth 83a immediately preceding it (the third tooth 83a from the front), is shown by a dashed line at the position of the rearmost tooth 84a and is hypothetically positioned there. The rear surface of the rearmost tooth 84a is located forward of the rear surface of the simulated tooth 84f, which contacts the tooth of the conveying gear. As a result, the rear surface of the rearmost tooth 84a does not contact the tooth of the conveying gear.

[0043] The front tooth 81a of the insert pin 5a protrudes inward in the width direction from the upper and lower parts on the inner side surface of the rod body 50a in the width direction. The front tooth 81a includes an upper tooth portion 811a constituting the upper side and a lower tooth portion 815a constituting the lower side. The lower tooth portion 815a also includes a first rear tooth portion 816a protruding rearward from the upper tooth portion 811a and a front portion 817a constituting the front side of the first rear tooth portion 816a.

[0044] The first rear tooth portion 816a forms the rear portion of the lower tooth portion 815a and also forms the rear portion of the forefront tooth 81a. A rear surface 816a1 of the first rear tooth portion 816a is parallel to the left-right direction.

[0045] The front side portion 817a forms the front portion of the lower tooth portion 815a. Furthermore, the front side portion 817a and the upper tooth portion 811a form the front portion of the foremost tooth 81a. The front portion of the foremost tooth 81a and the front end of the rod body 50a cooperate to form a semi-engaged portion 812a that engages with the meshing portion 45 of the rearmost element 40 on the box pin side. More specifically, the front end of the rod body 50a that forms the semi-engaged portion 812a is the front end of the rod body 5a and the inner side in the width direction with respect to the string member 3.

[0046] When viewed from above, the upper part of the half interlocking portion 812a has the same shape as the front part of the interlocking portion 45 of the element 40 when the interlocking portion 45 is divided into two halves, front and rear. In other words, the upper part of the half interlocking portion 812a is shaped like a right triangle. The front surface 813a of the upper part of the half interlocking portion 812a is inclined with respect to the left-right direction, tilting rearward as it moves inward in the width direction. The rear surface 814a of the upper part of the half interlocking portion 812a is parallel to the left-right direction. A first rear tooth portion 816a protrudes rearward from the rear surface of the lower part of the half interlocking portion 812a.

[0047] The lower part of the half-engagement portion 812a includes a half-neck portion 818a that forms the outer portion in the width direction and accommodates the rear portion of the head portion 45e of the rearmost element 40 on the box pin side, and a half-head portion 819a that forms the inner portion in the width direction and accommodates the rear portion of the neck portion 45d of the rearmost element 40 on the box pin side. When viewed from above, the half-neck portion 818a is hidden by the upper part of the half-engagement portion 812a and cannot be seen. The front surface 818a1 of the half-neck portion 818a is recessed in a semicircular shape toward the rear. The half-neck portion 818a has a shape corresponding to the front portion of the neck portion 45d of the element 40 on the insert pin side. The front surface 819a1 of the half-head portion 819a bulges forward in a semicircular shape when viewed from below. The half-head portion 819a has a shape corresponding to the front portion of the head portion 45e of the element 40 on the insert pin side.

[0048] The tooth row guide 56a is located widthwise outward of the tooth row 80A. The tooth row guide 56a is composed of a front guide portion 56a1, a middle guide portion 56a2, and a rear guide portion 56a3, which are successively arranged rearward from the front tooth 81a. The front guide portion 56a1 and the rear guide portion 56a3 are deeper than the middle guide portion 56a2. The groove depth is the widthwise dimension relative to a line parallel to the front-to-rear direction. The front guide portion 56a1 extends rearward from the front tooth 81a to the middle portion of the second-to-front tooth 82a in the front-to-rear direction. The front surface of the front guide portion 56a1 is parallel to the widthwise direction and continues to the rear surface 816a1 of the first rear tooth portion 816a. The rear surface of the front guide portion 56a2 is inclined with respect to the widthwise direction, tilting rearward as it moves inward in the widthwise direction. The middle guide portion 56a2 extends rearward from behind the front guide portion 56a2, reaching the gap between the third tooth 83a from the front and the rearmost tooth 84a. The inner surface of the middle guide portion 56a2 in the width direction is parallel to the front-to-rear direction. The rear guide portion 56a3 is formed in the range from behind the middle guide portion 56a2 to the rear end of the rod body 50a. The inner surface of the rear guide portion 56a3 in the width direction is inclined with respect to the width direction, with the front portion tilting outward in the width direction as it extends rearward, and the rear portion is parallel to the front-to-rear direction.

[0049] 6 to 8, 11, and 12, the box pin 5b resembles the insert pin 5a in a shape that is inverted from side to side. Portions of the box pin 5b that have the same functions as the insert pin 5a will be briefly explained, and while the same terms as the insert pin 5a are used, different reference numerals will be used.

[0050] Like the insert pin 5a, the box pin 5b also includes a rod body 50b, a fin 60b, and a tooth row 80B consisting of a plurality of teeth 81b to 83b. The box pin 5b also includes a protrusion 90 protruding from the underside of the rod body 50b.

[0051] The rod body 50b of the box pin 5b also extends in the front-to-rear direction. The string member 3 passes through the front surface 51b and the rear surface 52b of the rod body 50b. In this case, the string member 3 is parallel to the front-to-rear direction. Furthermore, when the string member 3 is parallel to the front-to-rear direction, the rod body 50b is also parallel to the front-to-rear direction. The upper surface 53b and the lower surface 54b of the rod body 50b are formed in flat shapes that are perpendicular to the up-down direction. An inward recess 55b is formed in the middle of the outer side surface in the width direction of the rod body 50b in the front-to-rear direction.

[0052] The fin 60b of the box pin 5b is also located above the lower surface 54b of the pin body 50b and below the upper surface 53b of the pin body 50b. A through hole 61b is also formed in the fin 60b.

[0053] In the tooth row 80B of the box pin 5b, three teeth 81b to 83b protrude from the pin body 50b at a distance in the front and rear. The three teeth 81b to 83b have a smaller amount of inward protrusion (maximum value) in the width direction relative to the string member 3, the further rearward the tooth. Therefore, with respect to the inner end in the width direction, the three teeth 81b to 83b are positioned in order from the foremost tooth 81b to the rearmost tooth 83b, and are positioned outward in the width direction in that order. In Figure 11, the inner end in the width direction of the string member 3 is indicated by a dotted line, and the protrusion amounts of the three teeth 81b to 83b are indicated as b1 to b3.

[0054] The two rear teeth 82b, 83b of the box pin 5b protrude inward in the width direction from the lower part of the inner side surface of the rod body 50b in the width direction. In other words, the protruding portions of the second and subsequent teeth 82b, 83ba of the box pin 5b are all the lower part of the inner side surface of the rod body 50b in the width direction. Furthermore, the inner side surfaces of the two rear teeth 82b, 83b in the width direction are parallel to the front-to-rear direction. The two rear teeth 82b, 83b are trapezoidal and symmetrical in the front-to-rear direction. The front and rear surfaces of the rearmost tooth 83b are in contact with the teeth of the conveying gear.

[0055] The front teeth 81b of the box pin 5b extend inward in the width direction from the upper and lower parts of the pin body 50b. The front teeth 81b include upper teeth 811b forming the upper side and lower teeth 815b forming the lower side.

[0056] The front surfaces 811b1 of the upper teeth 811b are parallel to the left-right direction. The rear surfaces 811b2 of the upper teeth 811b are inclined with respect to the width direction, tilting forward as they move inward in the width direction. The rear portions 812b of the upper teeth 811b and the portions 816b of the lower teeth 815b located in front of and on the inner side in the width direction are joined in the up-down direction. In other words, the rear portions 812b of the upper teeth 811b are the joint portions 812b (upper joint portions), and the portions 816b of the lower teeth 815b located in front of and on the inner side in the width direction are the other joint portions 816b (lower joint portions).

[0057] The front portion 813b of the upper tooth portion 811b is a front tooth portion 813b that protrudes forward relative to the lower tooth portion 815b and the joint portion 812b. In other words, the upper tooth portion 811b includes the joint portion 812b and the front tooth portion 813b.

[0058] A front surface 815b1 of the lower tooth portion 815b is parallel to the width direction. A rear surface 815b2 of the lower tooth portion 815b is inclined relative to the width direction, inclining forward as it moves inward in the width direction. The lower tooth portion 815b includes a joint portion 816b, a second rear tooth portion 817b that protrudes rearward relative to the upper tooth portion 811b and joint portion 816b, and an inner tooth portion 818b that protrudes inward in the width direction relative to the joint portion 816b and second rear tooth portion 817b.

[0059] The second rear tooth portion 817b overlaps the second tooth from the front of the insert pin 5a. The protruding portion of the second rear tooth portion 817b and the protruding portions of the second and subsequent teeth 82b and 83b of the box pin 5b are both located at the bottom of the inner side surface in the width direction of the pin body 50b.

[0060] 8, the inner tooth portion 818b is housed in the front guide portion 56a1 on the underside of the rod body 50a of the insert pin 5a. In this state, the second tooth 82b from the front faces the middle guide portion 56a2, and the rearmost tooth 83b faces the rear guide portion 56a3.

[0061] In the case of the chain member 1 or when the slide fastener is closed, as shown in FIG. 8 , the insert pin 5a and the box pin 5b have the following relationship. The teeth 81a to 84a of the insert pin 5a and the teeth 81b to 83b of the box pin 5b overlap vertically, allowing them to move parallel to the outside in the width direction. In this case, the teeth 81a to 84a of the insert pin 5a and the teeth 81b to 83b of the box pin 5b partially overlap vertically. More specifically, the teeth 81a to 84a of the insert pin 5a and the teeth 81b to 83b of the box pin 5b overlap vertically while being shifted by a half pitch P in the front-to-rear direction. The pitch P is the distance between the same positions of the meshing portions 45 of adjacent elements 40 (see FIG. 15 ). More specifically, the frontmost tooth 81a of the insert pin 5a and the frontmost tooth 81b of the box pin 5b overlap at the first rear tooth portion 816a and the front tooth portion 813b. Furthermore, the two teeth 82b, 83b on the rear side of the box pin 5b each overlap two of the three teeth 82a to 84a on the rear side of the insert pin 5a. Furthermore, the semi-meshing portion 812a of the insert pin 5a meshes with the meshing portion 45 of the rearmost element 40 on the box pin 5b side. As shown in Figure 1, when viewed from above, the front surface 813a (front surface of the upper tooth portion 811a) of the upper part of the semi-meshing portion 812a of the insert pin 5a is inclined in the width direction so as to face rearward as it moves inward in the width direction, and faces in parallel with the rear surface 45b of the upper part of the meshing portion 45 of the rearmost element 40 on the box pin 5b side.

[0062] When viewed from above, the rear surface 814a (rear surface of the upper teeth portion 811a) of the upper part of the semi-meshing portion 812a of the insert pin 5a and the front surface 813b1 (front surface of the upper teeth portion 811b) of the front teeth portion 813b of the box pin 5b face each other in a state parallel to the width direction, as shown in Fig. 6. When viewed from below, the rear surface 816a1 of the first rear teeth portion 816a of the insert pin 5a and the front surface of the front guide portion 56a1 are continuous and parallel to the width direction, and face each other in a state parallel to the front surface 815b1 of the lower teeth portion 815b of the box pin 5b, as shown in Fig. 8.

[0063] The protrusion 90 protrudes from the lower surface 54b of the rod body 50b rearward of the fin 60b. The protrusion 90 is for colliding with the rear slider 8B.

[0064] As shown in FIG. 4 , a stop groove 27 is formed inside the rear slider 8B to guide the protrusion 90 so that it can move forward and backward and to stop the protrusion 90. More specifically, the stop groove 27 is formed at the rear of the upper surface of the lower blade 23. In the drawing, the stop grooves 27 are formed on the left and right sides of the upper surface of the lower blade 23. In this embodiment, the right stop groove 27 engages with the protrusion 90, and the left stop groove 27 is symmetrical to the right stop groove 27 but is unrelated to the protrusion 90. The right stop groove 27 will be described below. The stop groove 27 guides the protrusion 90 so that it can move forward and backward and also stops the protrusion 90 from moving forward.

[0065] The stop groove 27 extends forward from the rear end of the lower blade 23. A front surface 28 of the stop groove 27 is located at the front end of the stop groove 27. A convex portion 90 collides with the front surface 28 of the stop groove 27. When the rear slider 8B is moved rearward relative to the pair of fastener stringers and the front surface of the stop groove 27 collides with the convex portion 90, as shown in FIG. 3 , the rear slider 8B is positioned at the rear limit position of its movement range, and the pin body 50b of the box pin 5b is housed inside the pair of sliders 8A, 8B, making it possible for the pin body 50a of the insert pin 5a to be inserted into or removed from the pair of sliders 8A, 8B.

[0066] 13A shows the rear slider 8B in its rearmost position. When the rear slider 8B is moved forward from this position, as shown in FIG. 13B, at the front of the rear slider 8B, the rod body 50a of the insert pin 5a and the rod body 50b of the box pin 5b are prevented from moving outward in the width direction by the parallel piece portions 26a of the left and right flanges 26, while at the rear of the rear slider 8B, the rod body 50a of the insert pin 5a and the rod body 50b of the box pin 5b are pushed outward in the width direction by the connecting posts 24 of the rear slider 8B, causing the rear slider 8B to tilt in the front-to-rear direction. When the rear slider 8B is further moved forward, the rearmost tooth 84a of the insert pin 5a and the rearmost tooth 83b of the box pin 5b come into contact with the connecting post 24 of the rear slider 8B, as shown in Figure 13 (C), and the rod body 50a of the insert pin 5a and the rod body 50b of the box pin 5b are pushed outward in the width direction.

[0067] As the rear slider 8B is moved forward, as shown in Figure 13 (D), the pair of rod bodies 50a, 50b come out of the left and right parallel piece portions 26a, and the rear portions of the pair of rod bodies 50a, 50b tend to widen in the width direction, and the teeth in the tooth rows 80A, 80B that come into contact with the connecting posts 24 shift to the more forward tooth. In the slide fastener of the above embodiment, the tooth in the tooth rows 80A, 80B that protrudes inward in the width direction relative to the string member 3 becomes smaller the more rearward the tooth. Therefore, each time the tooth that comes into contact with the connecting posts 24 shifts to the more forward tooth, the amount of outward movement of the insert pin 5a and the box pin 5b in the width direction gradually increases. As a result, the pair of rod bodies 50a, 50b gradually tilt in the front-to-rear direction between the pair of inclined piece portions 26b of the rear slider 8B, improving the operability of the rear slider 8B.

[0068] 3 and 14A, when inserting the insert pin 5a into the pair of sliders 8A, 8B, the rear portion of the rod body 50a of the insert pin 5a and the front portion of the rod body 50b of the box pin 5b face each other in the width direction inside the pair of sliders 8A, 8B, while the insert pin 5a is most tilted in the front-to-rear direction. At this stage, the rearmost tooth 84a of the insert pin 5a is most likely to come into contact with the connecting post 24 of the preceding slider 8A. However, because the rearmost tooth 84a of the insert pin 5a protrudes the least out of all the teeth of the insert pin 5a, it is less likely to come into contact with the connecting post 24, making it easier to insert the rod body 50a of the insert pin 5a.

[0069] 14(B) and 14(C), as the insert pin 5a is inserted, the inclination of the insert pin 5a in the front-to-rear direction decreases, and the teeth 81a to 83a in front of the rearmost teeth of the insert pin 5a gradually approach the box pin 5b, with the amount of tooth protrusion gradually increasing the further forward the tooth, making it easier to insert the insert pin 5a. Furthermore, because the tooth row guide 56a is formed on the pin body 50a of the insert pin 5a, the teeth 81b to 83b of the box pin 5b are guided by the tooth row guide 56a and are less likely to come into contact with the pin body 50a of the insert pin 5a, making it easier to insert the insert pin 5a. When the insertion of the insert pin 5a is complete, the widthwise overlap between the insert pin 5a and the box pin 5b increases as the teeth become more forward, and the pair of pin bodies 50a, 50b are stabilized within the pair of sliders 8A, 8B. When the insert pin 5a is removed from the pair of sliders 8A and 8B, it can be easily removed by following the procedure opposite to that for inserting it.

[0070] Moreover, since the rear surface of the rearmost tooth 84a of the insert pin 5a is located further forward than the rear surface of the dummy tooth 84f, when the rear slider 8B is operated, the rearmost tooth 84a is less likely to come into contact with the connecting pillar 24 of the rear slider 8B, and as a result, the operability of the rear slider 8B is improved.

[0071] Furthermore, in the slide fastener of the first embodiment, when the rear slider 8B is positioned at the rear limit position of its range of movement, the teeth 81a to 84a of the insert pin 5a and the teeth 81b to 83b of the box pin 5b are configured to overlap in the vertical direction while being able to move parallel to the outside in the width direction, so even if the rear slider 8B is moved forward, it is unlikely to be damaged other than the surfaces where the teeth 81a to 84a of the insert pin 5a and the teeth 81b to 83b of the box pin 5b overlap.

[0072] Furthermore, in the slide fastener of the first embodiment, the front portion of the foremost tooth 81a of the insert pin 5a and the front end portion of the pin body 50a of the insert pin 5a cooperate to form the semi-meshing portion 812a, and the semi-meshing portion 812a meshes with the rearmost element 40 of the box pin 5b, thereby improving the unity of the insert pin 5a with the element row 4 on the box pin side and the box pin 5b. In addition, the rear portion of the foremost tooth 81a of the insert pin 5a is the first rear tooth portion 816a, which protrudes rearward from the lower part of the rear surface of the semi-meshing portion 812a and overlaps with the foremost tooth 81b of the box pin 5b in a state where the first rear tooth portion 816a can move parallel to the outside in the width direction, thereby maintaining the operability of the rear slider 8B.

[0073] Furthermore, in the slide fastener of the first embodiment, by arranging the rear surface 814a of the upper part of the semi-engaged portion 812a and the rear surface 816a1 of the first rear tooth portion 816a parallel to the width direction, the foremost tooth 81a of the insert pin 5a overlaps with the foremost tooth 81b of the box pin 5b while being movable parallel to the outside in the width direction, thereby maintaining the operability of the rear slider 8B. Moreover, the foremost tooth 81b of the box pin 5b has a front tooth portion 813b on the upper side and a second rear tooth portion 817b on the lower side, so that the front tooth portion 813b overlaps with the first rear tooth portion 816a of the insert pin 5a from above, and the second rear tooth portion 817b overlaps with the second tooth 82a of the insert pin 5a from below, so that the foremost tooth 81b of the box pin 5b overlaps with the tooth row 80A of the insert pin 5a from above and below, thereby improving the unity of the insert pin 5a and the box pin 5b.

[0074] Furthermore, in the slide fastener of the first embodiment, the second and subsequent teeth 82b, 83b from the front of the box pin 5b protrude from the lower part, which is the same part of the upper and lower parts of the rod body 50b as the part to which the second rear tooth portion 817b belongs, and the second and subsequent teeth 82a to 84a from the front of the insert pin 5a protrude from the upper part, which is the same part of the upper and lower parts of the rod body 50a, so the second and subsequent teeth 82a to 84a of the insert pin 5a and the second and subsequent teeth 82b, 83b of the box pin 5b tend to overlap with each other.

[0075] When the element members 2a and 2b are transported to sew the fabric 7, as shown in Figures 15 and 16, multiple conveying gears G mesh with the widthwise inner sides of the element members 2a and 2b, guiding the lower portions of the element members 2a and 2b in parallel in the front-to-rear direction. Specifically, in the element row 4, the teeth G1 of the conveying gears G mesh with the elements 40 adjacent to each other in the front-to-rear direction. In the insert pin 5a and the box pin 5b, the teeth G1 of the conveying gears G mesh with the teeth 81a-84a and 81b-83b adjacent to each other in the front-to-rear direction. In the guide portions 6a and 6b, the teeth G1 of the conveying gears G mesh with the guide elements 16a and 16b adjacent to each other in the front-to-rear direction. Although not specifically shown, a guide groove is formed in the throat plate of the sewing machine in a straight line to guide the lower portions of the element members 2a and 2b. In the insert pin 5a, the portion below the fin 60a is guided by the guide groove. The portion of the box pin 5b below the fin 60b is also guided by the guide groove. The groove width of the guide groove is slightly larger than the maximum width 4W of the lower part of the element row 4. The maximum width 5aW of the rod body 50a of the insert pin 5a and the teeth 81a to 84a combined is less than the maximum width 4W of the element row 4. The maximum width 5bW of the rod body 50b of the box pin 5b combined with the teeth 81b to 83b is also less than the maximum width 4W of the element row 4. The maximum width 6aW of the lower part of the guide portion 6a on the insert pin side and the maximum width 6bW of the lower part of the guide portion 6b on the box pin 5b side are the same as the maximum width 4W of the element row 4.

[0076] As described above, fastener stringers are produced by cutting long element members 2a, 2b. The element members 2a, 2b are formed by repeatedly fastening the element row 4, rod members 5a, 5b, and guide portions 6a, 6b to the long string member 3 in this order toward the rear. To form the separated pair of element members 2a, 2b into a chain member 1, they are passed through an assembly slider 8C, as shown in FIG. 17 . When the element members 2a, 2b are passed through the assembly slider 8C, the pair of element rows 4 interlock with each other in the width direction, the tooth row 80A of the insert pin 5a and the tooth row 80B of the box pin 5b overlap vertically, and the pair of guide portions 6a, 6b interlock with each other in the width direction, forming the chain member 1. The assembly slider 8C has the same configuration as the previous slider 8A.

[0077] In conventional chain members, the front tooth of the insert pin 5a and the front tooth of the box pin 5b mesh together like a pair of element rows, preventing them from moving outward in the width direction. This configuration enhances the unity of the insert pin 5a and the box pin 5b. However, when the pair of element members 2a, 2b are passed through the assembly slider 8C, the front tooth of the insert pin 5a and the front tooth of the box pin 5b collide almost parallel to each other in the width direction before meshing, making it difficult for them to mesh and prone to damage.

[0078] Furthermore, conventional chain members are configured assuming a pair of fastener stringers formed not from a pair of element members 2a, 2b only, but also a pair of fastener stringers in which a separately produced box body is fixed to the rod body of the box pin, and the rod body of the insert pin is inserted and removed from the box body. In other words, conventional chain members are configured assuming an opening device composed of an insert pin, box pin, and box body.

[0079] In the case of a reverse opening tool, the rod body of the insert pin and the rod body of the box pin are longer in the front-to-rear direction than in the opening tool. Therefore, if a configuration in which the front tooth of the insert pin and the front tooth of the box pin mesh together so that they cannot move outward in the width direction, as in conventional chain members, were also adopted for the reverse opening tool, when the pair of element members 2a, 2b are passed through the assembly slider 8C, they are more likely to collide with each other before meshing, making it more difficult to mesh them and more likely to be damaged.

[0080] The chain member 1 of the above-described embodiment overcomes these drawbacks. To summarize, the chain member 1 has a pair of element members 2a, 2b extending in the front-rear direction that mesh with each other in the width direction (i.e., the left-right direction). One element member 2a includes one string member 3 extending in the front-rear direction, one element row 4 fixed in order toward the rear of the one string member 3, an insert pin 5a as one rod member, and one guide portion 6a. The other element member 2b includes the other string member 3 extending in the front-rear direction, the other element row 4 fixed in order toward the rear of the other string member 3, a box pin 5b as the other rod member, and the other guide portion 6b. The inner side of the element row 4 in the width direction meshes with the inner side of the opposing element row 4 in the width direction so as not to move parallel to the outer side in the width direction, and can mesh with a conveying gear G that conveys the element row 4 when sewing fabric 7 along the element row 4. The inner portions of the guide portions 6a, 6b in the width direction mesh with the inner portions of the opposing guide portions 6a, 6b in the width direction so as to be immovable parallel to the outer sides in the width direction, or they overlap vertically and can mesh with the conveying gear G. The rod members 5a, 5b include rod bodies 50a, 50b fixed to the string member 3 and capable of passing through the inside of the assembly slider 8C, fins 60a, 60b that extend outward in the width direction from the rod bodies 50a, 50b and on which the fabric 7 is placed, and tooth rows 80A, 80B consisting of three or more teeth 81a-84a, 81b-83b that extend inward in the width direction from the rod bodies 50a, 50b at intervals in the front-to-rear direction. The insert pin 5a and the box pin 5b overlap in the vertical direction at the teeth 81a to 84a, 81b to 83b of a pair of tooth rows 80A, 80B so as to be movable parallel to the outside in the width direction, and can mesh with the conveying gear G. The above is a feature of the chain member 1 of the above-described embodiment. It is desirable that the inner sides of the guide portions 6a, 6b in the width direction mesh with the inner sides of the opposing guide portions 6a, 6b in the width direction so as not to be able to move parallel to the outside in the width direction.

[0081] When the chain member 1 is produced by passing the pair of separated element members 2a, 2b through the assembly slider 8C, the pair of rod bodies 50a, 50b enter the assembly slider 8C in a position that is significantly tilted relative to the front-to-rear direction while being guided by the left and right flanges 26. As they enter, the tilt of the pair of rod bodies 50a, 50b becomes smaller. Then, immediately after the foremost tooth 81a of the insert pin 5a and the foremost tooth 81b of the box pin 5b pass through the connecting column 24 of the assembly slider 8C, the pair of rod bodies 50a, 50b are guided by the left and right parallel pieces 26a and assume a position that is almost parallel relative to the front-to-rear direction. In the above embodiment, the insert pin 5a and the box pin 5b are configured to overlap each other in the vertical direction at their inner widthwise portions so as to be movable parallel to each other outward in the horizontal direction, so that immediately after the foremost tooth 81a of the insert pin 5a and the foremost tooth 81b of the box pin 5b pass through the connecting post 24 of the assembly slider 8C, they gradually move inward in the horizontal direction and overlap each other in the vertical direction. As a result, it becomes easier to pass the pair of element members 2a, 2b through the assembly slider 8C, the chain member 1 is easier to assemble, and the pair of tooth rows 80A, 80B are less likely to be damaged.

[0082] The present invention is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the invention.

[0083] REFERENCE SIGNS LIST 1 Chain member 2a, 2b Element member 3 String member 4 Element row 4W Maximum width 5a Insert pin 5aW Maximum width 5b Box pin 5bW Maximum width 6a, 6b Guide portion 6aW, 6bW Maximum width 7 Fabric 8A, 8B, 8C Slider 10 Reverse opening device 16a, 16b Guide element 16a1, 16b1 Guide body portion 16a2, 16b2 Guide meshing portion 21 Slider body 21a Element path 21b Fabric groove 22 Upper blade 23 Lower blade 24 Connecting column 25 Pull tab attachment portion 26 Flange 26a Parallel piece portion 26b Inclined piece portion 27 Stop groove 28 Front surface 29 Pull tab 40 Element 41 Body portion 41a Front surface 41b Rear surface 41c Upper surface 41d Lower surface 41e Side surface 45 Engagement part 45a Front surface 45b Rear surface 45d Neck section 45d1 Front surface 45d2 Rear surface 45e Head 45e1 Front surface 45e2 Rear surface 50a, 50b Rod body 51a, 51b Front surface 52a, 52b Rear surface 53a, 53b Upper surface 54a, 54b Lower surface 55a, 55b Inward recess 56a Teeth row guide 56a1 Front guide portion 56a2 Middle guide portion 56a3 Rear guide portion 60a, 60b Fin 61a, 61b Through hole 80A, 80B Teeth row 81a, 82a, 83a, 84a, 84f, 81b, 82b, 83b Teeth 811a, 811b Upper tooth part 811b1 Front face 811b2 Rear face 812a Half-meshing part 812b Joint part (rear part) 813a Front face 813b Front tooth part 813b1 Front face 814a Rear surface 815a, 815b Lower tooth portion 815b1 Front surface 815b2 Rear surface 816a First rear tooth portion 816a1 Rear surface 816b Part, joint portion 817a Front side portion 817b Second rear tooth portion 818a Half neck portion 818a1 Front surface 818b Internal tooth portion 819a Half head 819a1 Front 90 Convex G Conveyor gear G1 Teeth P Pitch

Claims

1. A slide fastener comprising a pair of element rows (4) each consisting of a plurality of elements (40) arranged in a line in the front-rear direction and arranged in two rows in the width direction, a pair of string members (3) penetrating the elements (40) and separately securing the pair of element rows (4), a reverse opening device (10) consisting of a pair of rod members (5a, 5b) separately secured to the pair of string members (3) on the rear side of the pair of element rows (4), and a pair of sliders (8A, 8B) for opening and closing the pair of element rows (4) in opposite directions, the pair of sliders (8A, 8B) each including an upper blade (22) and a lower blade (23) opposed in the vertical direction and a connecting post (24) connecting the upper blade (22) and the lower blade (23), In the slide fastener, a fabric (7) is separately attached to an insert pin (5a) as one of the rod members and a box pin (5b) as the other rod member, and when the pair of sliders (8A, 8B) accommodates the insert pin (5a) and the box pin (5b), the insert pin (5a) can be removed from the pair of sliders (8A, 8B), wherein the rod members (5a, 5b) comprise rod bodies (50a, 50b) fixed to the rear ends of the string members (3) and accommodated in the sliders (8), fins (60a, 60b) that protrude outward in the width direction from the rod bodies (50a, 50b) and on which the fabric (7) is placed, and tooth rows (80A, 80B) consisting of three or more teeth (81a to 84a, 81b to 83b) that protrude inward in the width direction from the rod bodies (50a, 50b) at intervals in the front-to-rear direction, The inner side of the element row (4) in the width direction meshes with the inner side of the opposing element row (4) in the width direction, and meshes with a conveying gear (G) for conveying the element row (4) when sewing the fabric (7) along the element row (4), and the teeth (81a to 84a, 81b to 83b) at least partially overlap in the vertical direction with the teeth (81a to 84a, 81b to 83b) of the opposing bar member (5a, 5b), and mesh with the conveying gear (G), and the tooth rows (80A, 80B) have teeth that are located further back and have smaller inward protrusions in the width direction relative to the string member (3).

2. A slide fastener as described in claim 1, characterized in that, assuming that a simulated tooth (84f) simulating the outer shape of the tooth (83a) immediately preceding the rearmost tooth (84a) is placed at the position of the rearmost tooth (84a) of the butterfly pin (5a), the rear surface of the rearmost tooth (84a) is located forward of the rear surface of the simulated tooth (84f).

3. A slide fastener as described in claim 1 or 2, characterized in that the teeth (81a to 84a) of the butterfly pin (5a) and the teeth (81b to 83b) of the box pin (5b) overlap in at least a portion in the vertical direction so as to be movable parallel to the outside in the width direction.

4. A slide fastener as described in claim 3, characterized in that the front portion of the foremost tooth (81a) of the insert pin (5a) and the front end portion of the rod body (50a) of the insert pin (5a) cooperate to form a semi-engagement portion (812a) that engages with the rearmost element (40) on the box pin side, and the rear portion of the foremost tooth (81a) of the insert pin (5a) is a first rear tooth portion (816a) that protrudes rearward from the rear surface of one of the upper and lower portions of the semi-engagement portion (812a) and overlaps in the vertical direction with the foremost tooth (81b) on the box pin side.

5. The front tooth (81a) of the butterfly pin (5a) has a rear surface (814a) of the other of the upper and lower portions of the semi-engaging portion (812a) and a rear surface of the first rear tooth portion (816a) parallel to the width direction or tilted forward toward the inside in the width direction, the front tooth (81b) of the box pin (5b) has an upper tooth portion (811b) protruding from the upper portion of the inner side surface in the width direction of the pin body (50b) of the box pin (5b) and a lower tooth portion (815b) protruding from the lower portion of the side surface, one of the upper tooth portion (811b) and the lower tooth portion (815b) having a front tooth portion (813b) protruding forward relative to the other of the upper tooth portion (811b) and the lower tooth portion (815b) and overlapping with the first rear tooth portion (816a), A slide fastener as described in claim 4, characterized in that the other of the upper tooth portion (811b) and the lower tooth portion (815b) has a second rear tooth portion (817b) that protrudes rearward relative to the one of the upper tooth portion (811b) and the lower tooth portion (815b) and overlaps the second tooth (82a) from the front of the butterfly pin (5a).

6. A slide fastener as described in claim 5, characterized in that the teeth (82b, 83b) from the second forward onwards of the box pin (5b) protrude from the area of ​​the upper and lower parts of the side surface to which the second rear tooth portion (817b) belongs.

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