Separation insert for double open-end zipper

Abstract

A separable insert for a double-slider zipper that can reduce snagging when the slider of the double-slider zipper is pulled up from the lower end position is provided. The separable insert for a double-slider zipper of the present invention is used in a double-slider zipper (100) that can open between the left and right tooth rows (12) of the left and right zipper tapes (10) from the upper end and the lower end, and includes: a lower slider (30) that is a lower slider (30) for opening between the left and right tooth rows (12) from the lower end, and includes a locking claw (40) that is elastically biased to a protruding position protruding into a tooth guiding path (34) of the lower slider (30); an insertion rod (50) that is continuously provided at the lower end of one of the left and right tooth rows (12); and a base rod (60) that is continuously provided at the lower end of the other of the left and right tooth rows (12). At least one of the base rod (60) and the insertion rod (50) includes an avoidance groove (63) on a side surface (62) facing each other that can accommodate the locking claw (40). At least one of the base rod (60) and the insertion rod (50) has a tab (66) protruding from one side surface (62) facing each other toward the other side surface (51). The avoidance groove (63) extends upward at least to the lower end of the tab (66).

Description

Technical Field

[0001] The present invention relates to a separating insert for a double open-end zipper, and more particularly, to a separating insert composed of a lower slider, an inserting rod, and a base rod in a zipper having a lower slider for reverse opening. Background Art

[0002] A double open-end zipper is known in which an upper slider and a lower slider are inserted into respective chain tooth rows of a pair of left and right zipper tapes such that their rear openings face each other, and forward opening achieved by pulling down the upper slider and reverse opening achieved by pulling up the lower slider can be performed. Examples of such double open-end zippers are disclosed, for example, in Japanese Patent No. 4307413 (Patent Document 1), Japanese Patent No. 3621040 (Patent Document 2), and the like.

[0003] In a double open-end zipper, when the lower slider is pulled up from its lower end position to the first tooth separation position where the first tooth at the lower end is separated, the sliding resistance relative to the lower slider is the greatest when separating the first tooth. In addition, in a conventional double open-end zipper, it is known that the second greatest resistance occurs before the lower slider reaches the first tooth separation position. This second greatest resistance is generated as follows. As the lower slider is pulled up from the lower end position, the locking claws of the lower slider also move upward, and at a certain point in time, the inserting rod, the locking claws of the lower slider, and the base rod are most closely arranged in the left-right width direction in the tooth guide path of the lower slider. As a result, the inserting rod, the base rod, and the locking claws interfere with each other in the width direction, and the sliding resistance relative to the lower slider temporarily increases.

[0004] The thin line in Chart 1 shows the sliding resistance (N) of the lower slider with respect to the displacement (mm) of the lower slider when the lower slider of a conventional double open-end zipper is pulled up from its lower end position beyond the first tooth separation position. It can be seen from Chart 1 that at the first tooth (zipper tooth) separation position, the resistance becomes the maximum of 13.7 (N), and the second greatest resistance of 10.0 (N) occurs at the densest position where the inserting rod, the locking claws, and the base rod are most closely arranged in the width direction before the lower slider reaches the first tooth separation position. This second greatest resistance is perceived by the user pulling up the lower slider as a snagging of the lower slider, and this snagging becomes a burden on the user at the start of pulling up the lower slider.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Patent No. 4307413

[0008] Patent Document 2: Japanese Patent No. 3621040 Summary of the Invention

[0009] The present invention has been completed in view of the above problems, and an object thereof is to provide a separable insert for a double-slider zipper that can reduce snagging when the lower slider of the double-slider zipper is pulled up from the lower end position.

[0010] To solve the above problems, according to one aspect of the present invention, there is provided a separable insert for a double-slider zipper, which is used in a double-slider zipper capable of opening between the left and right chain tooth rows of the left and right zipper tapes from the upper end and the lower end. The separable insert is characterized by comprising: a lower slider for opening between the left and right chain tooth rows from the lower end, including a locking claw elastically biased to a protruding position protruding into the chain tooth guiding path of the lower slider; an insertion rod continuously provided at the lower end of one of the left and right chain tooth rows; and a seat rod continuously provided at the lower end of the other of the left and right chain tooth rows. At least one of the seat rod and the insertion rod includes an avoidance groove on the side surfaces facing each other and capable of accommodating the locking claw, and at least one of the seat rod and the insertion rod has a tab protruding from one side surface facing each other toward the other side surface, and the avoidance groove extends upward at least to the lower end of the tab.

[0011] In this specification, "upper" and "lower" are relative. For example, in fabrics such as clothing and bags, the lower slider of the double-slider zipper may be arranged above and the upper slider may be arranged below. In addition, in this specification, for "upper" and "lower", unless otherwise specified, based on the length direction of the zipper tape, the insertion rod, and the seat rod, one direction of the length direction of the zipper tape, the insertion rod, and the seat rod is referred to as "upper", and the other direction of the length direction is referred to as "lower".

[0012] An example of the "lower end of the tab" in the present invention is Figure 2 the portion indicated by reference numeral 66a in. That is, referring to Figure 2 , the avoidance groove 63 extends upward at least to the lower end 66a of the tab 66 in the vertical direction (the length direction of the seat rod 60). In the present invention, when the lower slider is pulled up from the lower end position to the first chain tooth division position, the locking claw of the lower slider also moves upward. At a certain point in time, the insertion rod, the locking claw, and the seat rod are arranged most closely in the left-right width direction in the chain tooth guiding path of the lower slider. At this time, the locking claw is partially accommodated in the avoidance groove provided on at least one of the side surfaces of the seat rod and the insertion rod. When the lower slider is pulled up to the first chain tooth division position, the locking claw does not displace in the width direction, and the seat rod or the insertion rod displaces in the width direction while partially accommodating the locking claw in the avoidance groove. Thus, it can be said that the locking claw relatively avoids in the width direction. Thereby, the total width occupied by the insertion rod, the locking claw, and the seat rod in the width direction can be reduced, and the interference in the width direction between the insertion rod and the seat rod and the locking claw can be reduced.

[0013] In addition, according to another aspect of the present invention, there is provided a separating insert for a double-slider zipper, which is used in a double-slider zipper capable of opening between the left and right chain tooth rows of the left and right zipper tapes from the upper end and the lower end, and is characterized by comprising: a lower slider for opening between the left and right chain tooth rows from the lower end, including a locking claw that is elastically biased to a protruding position protruding into the tooth guiding path of the lower slider; an insertion rod continuously provided at the lower end of one of the left and right chain tooth rows; and a seat rod continuously provided at the lower end of the other of the left and right chain tooth rows, at least one of the seat rod and the insertion rod having a relief groove on the side surface facing each other, and when the lower slider is pulled up from the lower end position to a first tooth dividing position where the first tooth at the lower end is separated, at the time when the upper ends of the seat rod and the insertion rod are received in the interior of the lower slider from the rear opening, the relief groove can partially receive the locking claw.

[0014] In the present invention, when the lower slider is pulled up from the lower end position to the first tooth dividing position, the locking claw of the lower slider also moves upward, and at a certain time point, the upper ends in the length direction of the stationary seat rod and insertion rod are received in the interior of the lower slider from the rear opening (refer to Figure 6 ). At this time point, in addition, it becomes the densest position where the insertion rod, the locking claw, and the seat rod are arranged most closely in the left and right width direction in the tooth guiding path of the lower slider. At this time, by partially receiving the locking claw in the relief groove provided on at least one of the side surfaces of the seat rod and the insertion rod, the locking claw can be relatively displaced in the width direction, thereby reducing the total width occupied by the insertion rod, the locking claw, and the seat rod in the width direction and reducing the interference in the width direction between the insertion rod and the seat rod and the locking claw.

[0015] In an embodiment of the present invention, the relief groove includes a relief portion capable of receiving the locking claw in the protruding position to the maximum extent in the left and right width direction, and the relief portion is disposed above the locking claw of the lower slider in the lower end position. The relief portion of the relief groove receives the locking claw in the protruding position to the maximum extent in the left and right width direction at the time when the insertion rod, the locking claw, and the seat rod become the densest position. In other words, the locking claw is relatively displaced to the maximum extent in the width direction in the relief portion of the relief groove. When the lower slider is in the lower end position, the relief portion is separated from the locking claw in the protruding position upward. If the lower slider moves upward from the lower end position, the locking claw in the protruding position approaches the relief portion, and the locking claw in the protruding position and the relief portion are arranged in the width direction at the time of the densest position.

[0016] In one embodiment of the present invention, the avoidance groove includes a guiding surface, and the guiding surface can guide the locking claw from the protruding position to the introducing position introduced from the tooth guiding path of the chain. When the pull tab is pulled up from the lower end position to the first chain tooth dividing position, a part of the locking claw at the protruding position of the pull tab enters the avoidance groove. Then, while moving upward together with the pull tab, the locking claw is guided from the protruding position to the introducing position by the guiding surface of the avoidance groove against the acting force of the elastic member.

[0017] In one embodiment of the present invention, the depth in the left - right width direction of the avoidance groove becomes deeper from bottom to top. Thus, when the slider is pulled upward from the lower end position, the avoidance groove gradually accommodates the locking claw in the width direction little by little. Therefore, it is easy to guide the locking claw into the avoidance groove.

[0018] In one embodiment of the present invention, the avoidance groove includes an inclined groove bottom surface, and the inclined groove bottom surface is inclined with respect to the locking claw at the protruding position so as to gradually separate in the left - right width direction from the lower wing plate side of the pull tab toward the upper wing plate side. When the pull tab is pulled up from the lower end position to the first chain tooth dividing position, a part of the locking claw at the protruding position of the pull tab enters the avoidance groove. At this time, since the inclined groove bottom surface of the avoidance groove is inclined with respect to the locking claw at the protruding position so as to separate in the width direction from the lower wing plate side toward the upper wing plate side, the gap in the width direction between the locking claw and the seat bar or the insertion bar having the avoidance groove increases from the lower wing plate side to the upper wing plate side. Thus, the interference in the width direction between the seat bar and the insertion bar and the locking claw is reduced.

[0019] In one embodiment of the present invention, only the seat bar has the avoidance groove. This embodiment will be described later with reference to the drawings, but the avoidance groove can be provided on the insertion bar or on both the seat bar and the insertion bar according to the width - direction position and size of the locking claw.

[0020] Advantages of the Invention

[0021] In the present invention, when the pull tab is pulled up from the lower end position to the first chain tooth dividing position, the locking claw is partially accommodated in the width direction in the avoidance groove provided on at least one of the seat bar and the insertion bar, and the locking claw can be relatively displaced in the width direction. Thus, the interference in the width direction between the insertion bar and the seat bar and the locking claw can be reduced. As a result, the hooking and burden perceived by the user when starting to pull up the pull tab can be alleviated. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a top view showing a double - open - end zipper having a separating insert for a double - open - end zipper of the present invention disconnected in the length direction (vertical direction).

[0023] Figure 2It is a perspective view of the seat bar.

[0024] Figure 3 It is a sectional view of the seat bar along the A-A line of Figure 2 the same.

[0025] Figure 4 It is a top view showing the pull-down head at the lower end position with the upper wing plate etc. omitted.

[0026] Figure 5 It is a top view similar to Figure 4 showing the state where the pull-down head is pulled up from the lower end position and the locking claw approaches the relief groove of the seat bar.

[0027] Figure 6 It is a top view similar to Figure 4 showing the state where a part of the locking claw of the pull-down head has entered the relief groove of the seat bar.

[0028] Figure 7 It is a top view similar to Figure 4 showing the state where the locking claw of the pull-down head is displaced to the introduction position.

[0029] Figure 8 It is a top view similar to Figure 4 showing the state where the pull-down head has reached the first chain tooth dividing position.

[0030] Figure 9 It is a sectional view of the pull-up head along the B-B line of Figure 6 the same, with the insertion bar omitted.

[0031] Figure 10 It is a view observed from the C-C line section of Figure 6 showing the time point when the locking claw moves from the side surface of the horizontal groove of the relief groove to the guiding surface. Detailed implementation mode

[0032] Hereinafter, embodiments of the present invention will be described based on the drawings, but the present invention is not limited to such embodiments and can be appropriately changed etc. within the scope of the claims and equivalents. Figure 1FIG. 0 is a top view showing a double-slider zipper 100 having the separable insert of the double-slider zipper of the present invention (hereinafter, also simply referred to as "zipper") disconnected in the longitudinal direction (vertical direction). Hereinafter, regarding the up and down of the zipper 100, unless otherwise specified, it is based on the up and down in the longitudinal direction of the zipper 100. The zipper 100 includes a pair of left and right zipper chains 10, an upper slider 20, and a lower slider 30. The left and right zipper chains 10 include left and right zipper tapes 11 and a row of teeth 12 formed by a series or a plurality of teeth 12a made of resin or metal and mounted on the respective opposing edge portions of the left and right zipper tapes 11. The upper slider 20 is a slider for opening between the left and right rows of teeth 12 from the upper end. The lower slider 30 is a reverse-opening slider for opening between the left and right rows of teeth 12 from the lower end. The upper and lower sliders 20 and 30 are inserted into the left and right rows of teeth 12 with their rear mouths (34a) facing each other.

[0033] The upper and lower sliders 20 and 30 are substantially the same except for the avoidance groove 63 of the seat bar 60 described later. Therefore, the structure of the lower slider 30 will be described below, and the description of the structure of the upper slider 20 will be omitted. The lower slider 30 includes a main body 30a and a pull tab 36. The main body 30a includes an upper wing plate 31, a lower wing plate 32 (see Figure 4 etc.) and a guide post 33 (see Figure 4 etc.) connecting the upper and lower wing plates 31 and 32. A Y-shaped tooth guide path 34 (see Figure 8 、 Figure 9 etc.) is defined between the upper and lower wing plates 31 and 32. The tooth guide path 34 opens to the rear mouth 34a of the lower slider 30 and also opens to two shoulder mouths 34b adjacent to the left and right of the guide post 33. The Y-shaped tooth guide path 34 is divided into a branch portion on the side of the two shoulder mouths 34b and a non-branch portion on the side of the rear mouth 34a. The non-branch portion of the tooth guide path 34 has a left and right width defined by the flanges 37 of the upper and lower wing plates 31 and 32 (only the flange 37 of the lower wing plate is shown in Figure 4 etc.). A pull tab connecting portion 35 is provided on the front surface of the upper wing plate 31, and the pull tab 36 is connected to the pull tab connecting portion 35. The user holds the pull tab 36 and moves the lower slider 30 up and down along the longitudinal direction of the zipper 100, whereby the lower slider 30 slides up and down to open and close between the left and right rows of teeth 12.

[0034] The lower slider 30 includes a locking claw 40 (see Figure 9 、 Figure 10 etc.). The locking claw 40 is always biased by a leaf spring (not shown) serving as an elastic member disposed within the pull tab connecting portion 35 through an opening 31b penetrating the upper wing plate 31 (see Figure 9 、 Figure 10)Apply force to the protruding position that protrudes into the slider guide path 34. The locking claw 40 at the protruding position abuts against the slider 12a existing in the slider guide path 34, and it acts as a resistance to the sliding of the pull tab 30. The base end portion 41 of the locking claw 40 (see Figure 10 ) is fixed relative to the upper wing plate 31. If the user holds the pull tab 36 and raises it from the fallen state, the locking claw 40 is introduced from the protruding position to the introducing position where it disengages from the slider guide path 34 against the acting force of the leaf spring. Thereby, the locking of the locking claw 40 is released, and the pull tab 30 can move up and down. The above description of the pull tab 30 also substantially applies to the upper pull tab 20.

[0035] Each slider chain tape 10 includes a top stop 13 continuously provided at the upper end of each slider row 12. The top stop 13 restricts the further upward movement of the upper pull tab 20. In addition, the left slider chain tape 10 includes an insertion rod 50 (see Figure 4 etc.) continuously provided at the lower end of the left slider row 12, and a socket rod 60 (see Figure 4 etc.) continuously provided at the lower end of the right slider row 12. The insertion rod 50 and the socket rod 60 are formed, for example, by injection molding or extrusion molding of a thermoplastic resin such as polyoxymethylene, polyamide, polypropylene, or polybutylene terephthalate with respect to the left and right slider tapes 11. The insertion rod 50 and the socket rod 60 restrict the further downward movement of the pull tab 30.

[0036] Figure 2 is a perspective view of the socket rod 60. Figure 3 is along Figure 2 The cross-sectional view of the socket rod 60 taken along the A-A line of. The socket rod 60 has an upper end face 60a as one end face in the length direction of the socket rod 60, a lower end face 60b as the other end face in the length direction, a front side face 61a, a back side face 61b, and a side face 62 opposite to the insertion rod 50. The upper end face 60a is the upper end in the length direction of the socket rod 60. The length direction of the socket rod 60 (and the insertion rod 50) substantially follows the length direction of the zipper 100. See Figure 3 , most of the cross-section of the socket rod 60 perpendicular to the length direction is U-shaped between the upper and lower end faces 60a and 60b, and the width direction end portion of the slider tape 11 (not shown) exists inside the hollow of the socket rod 60. In addition, the front side face 61a of the socket rod 60 is the face on the side of the upper wing plate 31 of the pull tab 30, and the back side face 61b is the face on the side of the lower wing plate 32. Hereinafter, the direction perpendicular to the length direction and connecting the front side face 61a and the back side will be referred to as the front-back direction.

[0037] On the side surface 62 of the seat bar 60, there are provided an avoidance groove 63 and a tab 66. The avoidance groove 63 is recessed from the side surface 62 towards the right, reaching the front side surface 61a. The depth of the avoidance groove 63 recessed from the side surface 62 towards the right gradually becomes deeper as it goes from the lower part to the upper part in the longitudinal direction. The portion of the front side surface 61a corresponding to the avoidance groove 63 is cut off. The avoidance groove 63 is provided at a substantially middle portion between the upper end surface 60a and the lower end surface 60b of the seat bar 60 and is relatively long in the longitudinal direction of the seat bar 60. Figure 2 The reference numeral 63b of the figure is the lower end of the avoidance groove 63, and the reference numeral 66a is the lower end of the tab 66. The avoidance groove 63 extends upward from the lower end 63b beyond the lower end 66a of the tab 66. The height of the tab 66 from the side surface 62 towards the left gradually becomes higher as it goes from the lower end 66a to the upper part. The length of the avoidance groove 63 in the longitudinal direction is approximately 1 / 3 of the length of the seat bar 60 in the longitudinal direction (the length between the upper end surface 60a and the lower end surface 60b). In addition, the avoidance groove 63 is provided in the side surface 62 of the seat bar 60 at approximately half of the portion on the front side surface 61a side in the front-back direction. The avoidance groove 63 has a groove bottom surface (inclined groove bottom surface) 64 having a substantially trapezoidal shape as the bottom surface of the groove recessed from the side surface 62 towards the right, and a groove side surface 65 connecting the groove bottom surface 64 and the side surface 62. From Figure 3It can be seen that the bottom surface 64 of the groove is slightly inclined toward the right in the width direction from the end portion (the boundary with the groove side surface 65) on the back side surface 61b side in the front-back direction toward the front side surface 61a. In other words, the bottom surface 64 of the groove is inclined in such a way that it gradually moves slightly away from the side surface 62 (or the engaging claw 40 of the insertion rod 50 or the protruding position not shown) toward the front side surface 61a from the boundary with the groove side surface 65. Therefore, hereinafter, the bottom surface 64 of the groove will be referred to as the inclined bottom surface 64 of the groove. The groove side surface 65 includes a horizontal groove side surface 65a at the lower part in the longitudinal direction substantially parallel to the front side surface 61a (or the back side surface 61b), and a guide surface 65b as an inclined groove side surface that extends obliquely upward in the longitudinal direction (toward the upper end surface 60a side) and toward the front side surface 61a in the front-back direction. The horizontal groove side surface 65a is connected to the guide surface 65b in a curved shape. In the vertical direction, the boundary between the horizontal groove side surface 65a and the guide surface 65b is at the position of the lower end 66a of the tab 66. The horizontal groove side surface 65a is set slightly closer to the back side surface 61b side in the front-back direction than the protruding end of the engaging claw 40 at the protruding position. In addition, the left-right width (the depth from the side surface 62) of the horizontal groove side surface 65a gradually increases from the lower end 63b of the avoidance groove 63 toward the upper part in the longitudinal direction. The horizontal groove side surface 65a is smoothly connected to the guide surface 65b. The avoidance groove 63 includes a deepest avoidance portion 63a that is recessed to the right from the side surface 62 at a position adjacent to the lower side of the guide surface 65b. The avoidance portion 63a is located in the vertical direction at a position corresponding to the upper end portion (the guide surface 65b side) of the horizontal groove side surface 65a. The avoidance portion 63a can accommodate the engaging claw 40 at the protruding position at the rightmost side.

[0038] Refer to Figure 4 etc., the insertion rod 50 includes an upper end surface 50a as the upper end in its longitudinal direction and a side surface 51 facing the seat rod 60. In addition, a tab 52 that protrudes to the right, that is, toward the seat rod 60 side, is provided above the side surface 51 of the insertion rod 50. The tab 52 of the insertion rod 50 and the tab 66 of the seat rod 60 partially overlap in the front-back direction to restrict the displacement of the insertion rod 50 and the seat rod 60 in the front-back direction. In addition, when the slider 30 is in the lower end position (refer to Figure 4 ), the relative displacement of the insertion rod 50 or the seat rod 60 relative to the slider 30 downward is restricted.

[0039] Figures 4 to 8 is a top view showing the process of pulling the slider 30 upward from the lower end position of the slider 30 (refer to Figure 4 ) to the first tooth separation position (refer to Figure 8 ) where the first teeth 12b, which are the lower teeth of the left and right tooth rows 12, are separated, with the upper wing plate 31 omitted. In Figures 4 to 8The left and right zipper tapes 11 are also omitted herein. The slider 30 moves upward in the longitudinal direction from its lower end position toward the first tooth division position, but the insertion rod 50 and the seat rod 60 are in the same position in the longitudinal direction. At this time, the locking claw 40 also moves upward together with the slider 30, but the locking claw 40 does not displace in the left-right direction. In the present embodiment, the lower end position of the slider 30 is the position where the slider 30 is restricted from further moving downward by the insertion rod 50 and the seat rod 60. In the state where the slider 30 is at the lower end position (refer to Figure 4 ), the left and right tooth rows 12 between the slider 30 and the upper slider 20 are closed. Further, at the lower end position of the slider 30, the upper portions of the insertion rod 50 and the seat rod 60 protrude upward from the rear opening 34a of the slider 30 the most. The exposed portions of the upper portions of the insertion rod 50 and the seat rod 60 that are exposed from the slider 30 gradually decrease as the slider 30 is pulled upward (refer to Figure 5 and Figure 6 ), and at the time point of Figure 6 , the upper end surfaces 50a and 60a of the insertion rod 50 and the seat rod 60 are housed inside the slider 30 from the rear opening 34a (the state where the insertion rod 50 and the seat rod 60 are least exposed to the outside of the slider 30). At this time point, as will be described later, the insertion rod 50, the locking claw 40, and the seat rod 60 are arranged in the tightest and densest position in the left-right width direction in the tooth guide path 34 of the slider 30. If the slider 30 moves further upward from this time point, the lower portions of the insertion rod 50 and the seat rod 60 start to be exposed downward from the left and right shoulder openings 34b of the slider 30 (refer to Figure 7 ), and the slider 30 reaches the first tooth division position (refer to Figure 8 ).

[0040] In the present embodiment, from Figure 4 and the like, it can be seen that the locking claw 40 is located at a position slightly to the right of the left-right midpoint in the width direction of the slider 30, that is, on the side of the seat rod 60. Further, the opening 31b of the upper wing plate 31 through which the locking claw 40 passes (refer to Figure 9 and the like) is also provided to the right of the left-right midpoint. Therefore, in the present embodiment, the seat rod 60 is provided with an avoidance groove 63 for avoiding the locking claw 40. Referring to Figure 4 , in the state where the slider 30 is at its lower end position, the avoidance portion 63a of the avoidance groove 63 of the seat rod 60 is arranged to be upward and away from the locking claw 40 in the protruding position. In other words, the locking claw 40 of the slider 30 at the lower end position and the avoidance portion 63a of the avoidance groove 63 of the seat rod 60 are positioned to be away from each other in the longitudinal direction. Further, in the state where the slider 30 is at the lower end position, the lower end 63b of the avoidance groove 63 is also located above the locking claw 40. In the present embodiment, in Figure 4At the time point, the entire avoidance groove 63 moves upward away from the locking claw 40, but it is also possible that the lower end 63b of the avoidance groove 63 is at approximately the same vertical position as the locking claw 40 or lower.

[0041] If starting from Figure 4 the lower end position and pulling the pull head 30 upward, then as Figure 5 shown, the locking claw 40 at the protruding position approaches the lower end 63b of the avoidance groove 63 of the seat bar 60. If the pull head 30 further moves upward from this position, the insertion bar 50 and the seat bar 60 constrained between the left and right flanges 37 are slightly displaced in the width direction so as to approach each other. As a result, the avoidance groove 63 of the seat bar 60 locally accommodates the locking claw 40 at the protruding position. Since the avoidance groove 63 gradually deepens upward from the lower end 63b, it is easy to lure the locking claw 40 into the avoidance groove 63. If the pull head 30 further moves upward from Figure 5 the time point, then at a certain time point, as Figure 6 shown, it becomes a state where the upper end faces 50a, 60a of the insertion bar 50 and the seat bar 60 are accommodated inside the pull head 30 from the rear opening 34a. In this state, it becomes the densest position where the insertion bar 50, the locking claw 40, and the seat bar 60 are arranged most closely in the width direction between the chain tooth guide paths 34 of the pull head 30, that is, between the left and right flanges 37. At this time, as Figure 6 (and Figure 9 ) shown, a part of the locking claw 40 is accommodated in the rightmost deepest avoidance portion 63a of the avoidance groove 63 of the seat bar 60. Figure 9 is a cross-sectional view of the pull head 20 along the B-B line of Figure 6 . The insertion bar 50 is omitted in Figure 9 . At the time point when the insertion bar 50, the locking claw 40, and the seat bar 60 reach the densest position, as Figure 6 and Figure 9 shown, a part of the locking claw 40 at the protruding position is accommodated in the avoidance portion 63a of the avoidance groove 63, thereby enabling the locking claw 40 to be maximally relatively avoided to the right in the width direction. Corresponding to the partial accommodation of the locking claw 40 in the avoidance portion 63a of the avoidance groove 63, the total width occupied by the insertion bar 50, the locking claw 40, and the seat bar 60 in the width direction can be reduced. Thereby, the interference in the width direction between the insertion bar 50 and the seat bar 60 and the locking claw 40 can be reduced.

[0042] In addition, in Figure 6 and Figure 9At the time point, the locking claw 40 partially rides on the side surface 65a of the horizontal groove of the avoidance groove 63 and is close to and faces the inclined groove bottom surface 64 of the avoidance groove 63. The surface of the locking claw 40 facing the inclined groove bottom surface 64 is perpendicular to the up-down direction and the left-right direction respectively. At this time, the inclined groove bottom surface 64 of the avoidance groove 63 is inclined with respect to the locking claw 40 at the protruding position so as to gradually move away in the width direction toward the upper wing plate 31 side in the front-back direction. Therefore, the gap in the width direction between the locking claw 40 and the seat bar 60 (inclined groove bottom surface 64) increases from the lower wing plate 32 side to the upper wing plate 31 side in the front-back direction. This can also reduce the interference in the width direction between the seat bar 60 and the locking claw 40.

[0043] When the slider 30 moves upward further from Figure 6 the time point to Figure 7 the time point, the locking claw 40 also moves upward. At this time, the part of the locking claw 40 that has entered the avoidance groove 63 moves onto the guide surface 65b of the avoidance groove 63 while sliding on the side surface 65a of the horizontal groove of the avoidance groove 63. Figure 10 is a view observed from the C-C line cross-section of Figure 6 showing the time point when the locking claw 40 moves from the side surface 65a of the horizontal groove of the avoidance groove 63 to the guide surface 65b. If the slider 30 moves upward further from Figure 10 the time point, then as shown by the dashed line in Figure 10 , the locking claw 40 is guided by the guide surface 65b toward the upper wing plate 31 side in the front-back direction while sliding on the guide surface 65b of the avoidance groove 63. Thus, the locking claw 40 displaces from the protruding position to the introduction position that is out of the tooth guide path 34 of the slider 30 against the acting force of the leaf spring. Figure 7 shows the time point when the locking claw 40 displaces to the introduction position. If the slider 30 is further pulled upward from Figure 7 the time point, then the slider 30 reaches Figure 8 the first tooth dividing position shown in

[0044] Chart 1

[0045]

[0046] The thick line in Chart 1 shows the sliding resistance (N) of the pull - down head 30 of the double - open - end zipper 100 described above with respect to the displacement (mm) of the pull - down head 30 when it is pulled up from its lower end position across the first chain - tooth splitting position. As can be seen from Chart 1, at the first chain - tooth (zipper tooth) splitting position, the resistance becomes the maximum of 11.2 (N). In addition, before the pull - down head 30 reaches the first chain - tooth splitting position, at the densest position where the insertion rod 50, the locking claw 40, and the seat rod 60 are arranged most closely in the width direction, the second - largest resistance of 10.0 (N) was generated in the conventional product. However, in the pull - down head 30, since the locking claw 40 can be relatively avoided through the avoidance groove 63 provided in the seat rod 60, such a second - largest resistance is not substantially generated. Thus, it is possible to reduce the snagging and burden when the pull - down head 30 of the double - open - end zipper 100 is pulled up from the lower end position.

[0047] In the above - mentioned embodiment, an example of providing the avoidance groove 63 in the seat rod 60 is given. However, in the case where the locking claw 40 is to the left of the mid - point in the width direction, or in the case where the arrangement of the insertion rod and the seat rod is opposite to the above left - right arrangement, etc., the avoidance groove can be provided in the insertion rod, or in both the insertion rod and the seat rod.

[0048] Explanation of reference numerals

[0049] 10 Zipper chain tape

[0050] 11 Zipper tape

[0051] 12 Chain - tooth row

[0052] 12a Chain tooth

[0053] 12b First chain tooth

[0054] 13 Upper stop

[0055] 20 Upper pull - head

[0056] 30 Pull - down head

[0057] 30a Body

[0058] 31 Upper wing plate

[0059] 32 Lower wing plate

[0060] 33 Guide post

[0061] 34 Chain - tooth guide path

[0062] 34a Rear opening

[0063] 34b Shoulder opening

[0064] 35 Pull - tab connecting part

[0065] 36 Pull - tab

[0066] 40 Locking Claws

[0067] 50 Pushing Rod

[0068] 50a Upper End Face (Upper End) of the Pushing Rod

[0069] 51 Side Face of the Pushing Rod

[0070] 52 Tab

[0071] 60 Seating Rod

[0072] 60a Upper End Face (Upper End) of the Seating Rod

[0073] 62 Side Face of the Seating Rod

[0074] 63 Avoidance Groove

[0075] 63a Avoidance Portion

[0076] 64 Bottom Surface of the Inclined Groove (Groove Bottom Surface)

[0077] 65 Groove Side Face

[0078] 65a Horizontal Groove Side Face

[0079] 65b Guiding Surface (Inclined Groove Side Face)

[0080] 66 Tab

[0081] 100 Double Open-End Zipper

Claims

1. A separating insert for a double open-end zipper, which is used in a double open-end zipper (100) capable of opening between the left and right chain tooth rows (12) of the left and right zipper tapes (10) from the upper end and the lower end, and is characterized in that, Comprising: A pull head (30) which is a pull head (30) for opening between the left and right rows of teeth (12) from the lower end, and includes a locking claw (40) that is elastically biased to a protruding position protruding into a tooth guiding path (34) of the pull head (30); An insertion rod (50) which is continuously provided at the lower end of one row of teeth of the left and right rows of teeth (12); and A base rod (60) which is continuously provided at the lower end of the other row of teeth of the left and right rows of teeth (12), At least one of the base rod (60) and the insertion rod (50) includes an avoidance groove (63) on a side surface (62) facing each other, and the avoidance groove (63) can accommodate the locking claw (40). At least one of the base rod (60) and the insertion rod (50) has a tab (66) protruding from one side surface (62) facing each other toward the other side surface (51), and the avoidance groove (63) extends upward at least to the lower end of the tab (66). The avoidance groove (63) includes a guiding surface (65b) serving as an inclined groove side surface, and the guiding surface (65b) extends obliquely upward in the length direction of the insertion rod (50) or the base rod (60) and toward the front side surface in the front-back direction.

2. A separating insert for a double-open-end zipper, which is used in a double-open-end zipper (100) capable of opening between the left and right chain tooth rows (12) of the left and right zipper chain tapes (10) from the upper end and the lower end, and is characterized in that, Comprising: A pull head (30) which is a pull head (30) for opening between the left and right rows of teeth (12) from the lower end, and includes a locking claw (40) that is elastically biased to a protruding position protruding into a tooth guiding path (34) of the pull head (30); An insertion rod (50) which is continuously provided at the lower end of one row of teeth of the left and right rows of teeth (12); and A base rod (60) which is continuously provided at the lower end of the other row of teeth of the left and right rows of teeth (12), At least one of the base rod (60) and the insertion rod (50) has an avoidance groove (63) on a side surface (62) facing each other. When the pull head (30) is pulled from its lower end position to a first tooth splitting position where the first tooth (12b) at the lower end is separated, at the time when the upper end of the base rod (60) and the upper end of the insertion rod (50) are received inside the pull head (30) from the rear opening (34a), the avoidance groove (63) can partially accommodate the locking claw (40). The avoidance groove (63) includes a guiding surface (65b) serving as an inclined groove side surface, and the guiding surface (65b) extends obliquely upward in the length direction of the insertion rod (50) or the base rod (60) and toward the front side surface in the front-back direction.

3. The separating insert for a double-open end zipper according to claim 1 or 2, wherein The avoidance groove (63) includes an avoidance portion (63a) that can accommodate the locking claw (40) at the protruding position to the maximum extent in the left-right width direction, and the avoidance portion (63a) is disposed above the locking claw (40) of the pull head (30) in the lower end position.

4. The separating insert for a double-open end zipper according to claim 1 or 2, wherein The guide surface (65b) can guide the locking claw (40) from the protruding position to the introduction position introduced from the tooth guiding path (34).

5. The separable insert for a double-open-end zipper according to claim 1 or 2, characterized in that The depth of the relief groove (63) in the left-right width direction becomes deeper from bottom to top.

6. The separable insert for a double-open-end zipper according to claim 1 or 2, characterized in that The relief groove (63) includes an inclined groove bottom surface (64), and the inclined groove bottom surface (64) is inclined with respect to the locking claw (40) in the protruding position so as to gradually separate in the left-right width direction from the lower wing plate (32) side of the lower pull head (30) toward the upper wing plate (31) side.

7. The separable insert for a double-open-end zipper according to claim 1 or 2, characterized in that Only the seat bar (60) has the relief groove (63).

Images