Zipper and design method thereof

Abstract

The present invention provides a zipper and a design method thereof. In the zipper, when a left and right fastener element pair (E0, E1) included in left and right fastener elements (21, 22) initially contacts the rear protrusion (44) of the front fastener element (E0) of the left and right fastener element pair (E0, E1) and the front protrusion (41) of the rear fastener element (E1) of the left and right fastener element pair (E0, E1), the rear protrusion (42) of the rear fastener element (E1) does not contact the front protrusion (43) of the fastener element (E2) that is one element behind the rear fastener element (E1).

Description

Technical Field

[0001] The invention relates to a zipper and a design method thereof. Background Art

[0002] Patent document 1 discloses a method as described in the document. Figure 4 As shown in the figure, the zipper elements are provided with engaging protrusions on both sides. Figure 2 The concave portion 10 shown in FIG. 10 avoids the formation of the raised portion 58 shown in FIG. 10 of the document.

[0003] Patent Document 2 discloses a zipper element having an engaging convex portion on one surface and an engaging concave portion on the other surface. Figure 2 The inclined surface 8 shown in (b) can promote smooth engagement of the fastener elements.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 5460862

[0007] Patent Document 2: Japanese Patent No. 5042358 Summary of the Invention

[0008] Although there was almost no such demand in the past, in recent years, the demand for closing a zipper by moving the slider with less force has become increasingly high. After in-depth research, the inventors of this application have found that the zipper of the type disclosed in Patent Document 1 has the following problems. Specifically, Figure 8 As shown, when the slider moves forward, the left and right zipper elements E1' and E2' make initial contact within the slider. The rear protrusion of zipper element E2' on the rear side of the left and right zipper elements E1' and E2' contacts the front protrusion of zipper element E3'. Therefore, a greater force is required to force the rear protrusion of zipper element E1' to cross over the front protrusion of zipper element E2', thereby increasing the sliding resistance of the slider. Furthermore, the pair of zipper elements E1' and E2' (E2', E3') that make initial contact maintain contact from a first position, at a first distance D1' from the rear end of the connecting post 93 of the slider 9, to a second position, at a second distance D2' from the rear end of the connecting post 93 of the slider 9.

[0009] Research has shown that reducing the height of the front and rear protrusions is necessary to avoid increasing the sliding resistance of the slider, but this will result in a decrease in the lateral pull strength of the zipper. Therefore, the present invention aims to maintain the protrusion height of the front and rear protrusions of the zipper elements while reducing the sliding resistance of the slider.

[0010] One embodiment of the present disclosure relates to a slide fastener comprising: left and right fastener tapes having fastener elements attached to opposing side edges of the fastener tapes, the fastener elements including a mounting base attached to the side edges of the fastener tapes and a head having an engaging protrusion disposed at a position away from the side edges of the fastener tapes, the engaging protrusion including a front protrusion protruding forward and a rear protrusion protruding rearward; and a slider that advances to engage the left and right fastener elements included in the left and right fastener tapes, causing the left and right fastener elements to alternately make initial contact with their respective front protrusions and rear protrusions within the slider in response to the advancement of the slider. When a left and right fastener element pair included in the left and right fastener elements makes initial contact with the rear protrusion of the front fastener element of the left and right fastener element pair and the front protrusion of the rear fastener element of the left and right fastener element pair, the rear protrusion of the rear fastener element does not contact the front protrusion of the zipper element one element behind the rear fastener element.

[0011] In some embodiments, the engaging protrusion includes: a proximal inclined surface that increases in distance from the mounting base; a distal inclined surface that increases in distance from the mounting base; and a top portion formed separately between the proximal inclined surface and the distal inclined surface. The distal inclined surface may be divided into a plurality of inclined regions having different slopes, with the slope of the inclined region near the top portion being less steep than that of the inclined region farther from the top portion.

[0012] In some embodiments, the left and right zipper elements make initial contact in an inclined area near the top. The top may include a flat surface extending flatly along the protruding direction of the head from the side edge of the zipper tape. The initial contact position of the left and right zipper elements may be located on the center line of the slider. The head may include a flat plate portion, the thickness of which is determined by a front surface provided with a front protrusion and a rear surface provided with a rear protrusion, and has a thickness less than the thickness of the mounting base. A front recess may be formed between the front protrusion and the mounting base, and a rear recess may be formed between the rear protrusion and the mounting base.

[0013] Another embodiment of the present invention relates to a design method for a zipper, which is a design method for a zipper, comprising: left and right zipper tapes, which have zipper teeth installed on the side edges of the zipper tapes, the zipper teeth including a mounting base installed on the side edges of the zipper tape, and a head with an engaging protrusion provided at a position away from the side edges of the zipper tape, the engaging protrusion including a front protrusion protruding forward and a rear protrusion protruding rearward; and a slider, which advances to engage the left and right zipper teeth included in the left and right zipper tapes, and in accordance with the advancement of the slider, the left and right zipper teeth make initial contact alternately with their respective front protrusions and rear protrusions. In this design method, when the rear protrusion of the zipper tooth on the front side of a left and right zipper tooth pair included in the left and right zipper teeth makes initial contact with the front protrusion of the zipper tooth on the rear side of the left and right zipper tooth pair in the slider, the rear protrusion of the zipper tooth on the rear side is prevented from contacting the front protrusion of the zipper tooth one step behind the zipper tooth on the rear side.

[0014] Effects of the Invention

[0015] According to one aspect of the present disclosure, it is possible to promote maintenance of the protrusion heights of the front protrusions and the rear protrusions of the fastener elements and reduce the sliding resistance of the slider. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of a slide fastener according to one embodiment of the present disclosure.

[0017] Figure 2 This is a schematic perspective view of a fastener element according to one embodiment of the present disclosure.

[0018] Figure 3 This is a schematic front side view or rear side view of the fastener element according to one aspect of the present disclosure.

[0019] Figure 4 It is along Figure 3 Schematic diagram of the cross section of the zipper teeth with dotted lines.

[0020] Figure 5 is with Figure 4 A schematic cross-sectional view of a corresponding conventional zipper element.

[0021] Figure 6 This is a schematic diagram showing a state of fastener elements in a slider according to one embodiment of the present disclosure. The left and right element pairs make initial contact at an initial contact point that is a first distance away from a connecting post of the slider.

[0022] Figure 7 This is a schematic diagram showing the state of the zipper elements in the slider according to one embodiment of the present invention, showing that the slider moves forward. Figure 6 The front left and right chain teeth make initial contact.

[0023] Figure 8 This is a schematic diagram showing the state of conventional fastener elements in a slider.

[0024] Description of Reference Numerals

[0025] 1 zipper

[0026] 9 Slider

[0027] 11 Zipper tape

[0028] 12 zipper ties

[0029] 13 side edge

[0030] 14 side edge

[0031] 21 zipper teeth

[0032] 22 zipper teeth

[0033] 31 Mounting base

[0034] 32 Mounting base

[0035] 33 Head

[0036] 34 Head

[0037] 41 Anterior protrusion

[0038] 42 posterior protrusion

[0039] 43 Anterior protrusion

[0040] 44 posterior protrusion

[0041] 56 Flat Plate

[0042] B1 engagement protrusion

[0043] B2 engagement protrusion DETAILED DESCRIPTION

[0044] Below, refer to Figures 1 to 8 , various embodiments and features are described. Those skilled in the art will be able to combine the various embodiments and / or features without further explanation, and will also be able to understand the synergistic effects brought about by such combinations. In principle, repeated descriptions between the embodiments will be omitted. The accompanying drawings are primarily for the purpose of describing the invention and have been simplified for ease of drawing. Each feature should be understood as a universal feature that is not only effective for the zipper disclosed in this application, but also for various other zippers not disclosed in this specification.

[0045] In this specification, the front-to-back direction is understood based on the movement of the slider 9. The front direction corresponds to the movement direction of the slider 9 for closing the fastener tapes 3 and 4. The rear direction corresponds to the movement direction of the slider 9 for opening the fastener tapes 3 and 4. The left-right direction is understood based on the fastener tapes 3 and 4 being opened and closed by the slider 9. The up-down direction is orthogonal to the front-to-back direction and the left-to-right direction, for example, it is orthogonal to the tape surface that defines the tape thickness of the fastener tape.

[0046] like Figure 1 As shown, the zipper 1 includes: left and right zipper tapes 3, 4; and a slider 9, which moves forward to close the left and right zipper tapes 3, 4 and moves backward to open the left and right zipper tapes 3, 4. The zipper tapes 3, 4 include zipper tapes 11, 12 and zipper teeth 21, 22. The zipper teeth 21, 22 are installed on the opposite side edges 13, 14 of the zipper tapes 11, 12. Front stops 81, 82 are provided on each zipper tape 11, 12 adjacent to the front end of the zipper teeth 21, 22 queue to prevent the slider 9 from falling off from the zipper teeth 21, 22 queue. The left and right zipper tapes 3, 4 are connected by a common rear stop 83 at the rear end of the zipper teeth 21, 22 queue. It is also possible to use a left and right detachable rear stop. The front stops 81, 82 and the rear stop 83 can be omitted. The zipper is not limited to Figure 1 The present invention can also be applied to a concealed slide fastener in which the fastener elements are obstructed from being seen by the fastener tape.

[0047] The zipper tapes 11 and 12 are made of a soft fabric such as a woven fabric, a knitted fabric, or a blend thereof. They are longer in the front-to-back direction and shorter in the left-to-right direction. The thickness of the zipper tapes 11 and 12 is determined by the upper and lower tape surfaces. The tape surfaces have a pattern corresponding to the woven or knitted structure of the zipper tapes 11 and 12. In some cases, a core thread is provided on the facing side edges 13 and 14 of the zipper tapes 11 and 12 to facilitate secure attachment of the zipper elements 21 and 22. The core thread has a diameter greater than the thickness of the zipper tapes 11 and 12.

[0048] The zipper elements 21 and 22 are metal or resin elements. When the zipper elements 21 and 22 are made of metal, the zipper elements 21 and 22 are riveted to the side edges 13 and 14 (for example, the core wire here) of the zipper tapes 11 and 12. Each zipper element 21 and 22 is manufactured by cutting and stamping the metal material. In order to make the surface of each zipper element 21 and 22 glossy, each zipper element 21 and 22 is polished. When the zipper elements 21 and 22 are made of resin, the zipper elements 21 and 22 are fixed to the side edges 13 and 14 (for example, the core wire here) of the zipper tapes 11 and 12 by injection molding. It is also conceivable to use other materials (for example, ceramics) to manufacture the zipper elements 21 and 22.

[0049] like Figures 2 to 4 As shown, the fastener elements 21 and 22 include mounting bases 31 and 32, which are mounted on the side edges 13 and 14 of the zipper tapes 11 and 12, and heads 33 and 34, each having engaging protrusions B1 and B2 disposed at positions away from the side edges 13 and 14 of the zipper tapes 11 and 12. The mounting bases 31 and 32 include legs 51 and 52, which are provided to hold the side edges 13 and 14 of the zipper tapes 11 and 12, and a connecting portion 53, which connects the base ends of the legs 51 and 52. The legs 51 and 52 extend outward in the left-right direction (away from the center line CL of the zipper in the left-right direction) away from the connecting portion 53. A space for holding the side edges 13 and 14 of the zipper tapes 11 and 12 (e.g., the core wire disposed therein) is defined between the legs 51 and 52. Protrusions 51 a and 52 a are provided at the distal ends of the legs 51 and 52 to prevent the side edges 13 and 14 (eg, core wire) from escaping from the holding space between the legs 51 and 52 .

[0050] The heads 33 and 34 extend from the mounting bases 31 and 32 inward in the left-right direction (in the direction toward the center line CL of the zipper in the left-right direction). The engaging protrusions B1 and B2 provided on the heads 33 and 34 include front protrusions 41 and 43 that protrude forward and rear protrusions 42 and 44 that protrude rearward. The front protrusion 41 and the rear protrusion 42 protrude coaxially to opposite sides. The same applies to the front protrusion 43 and the rear protrusion 44. The heads 33 and 34 include a flat plate portion 56, the thickness of which is determined by a front surface 56a on which the front protrusions 41 and 43 are provided and a rear surface 56b on which the rear protrusions 42 and 44 are provided. The thickness (in the front-to-back direction) of the flat plate portion 56 is smaller than the thickness (in the front-to-back direction) of the mounting bases 31 and 32. A front recess 57 is formed between the front protrusion 41 (and the front protrusion 43 as well) and the mounting base 31, and a rear recess 58 is formed between the rear protrusion 42 (and the rear protrusion 44 as well) and the mounting base 31. The front protrusions 41, 43 and the rear protrusions 42, 44 are provided so as to be slightly offset from the top end surface 56c of the flat plate portion 56 toward the mounting bases 31, 32.

[0051] like Figure 4As shown, the engaging protrusion B1 (and the same for the engaging protrusion B2) includes front and rear proximal inclined surfaces 61 that move away from the mounting bases 31 and 32, front and rear distal inclined surfaces 62 (62a, 62b) that move toward each other as they move away from the mounting bases 31 and 32, and front and rear tops 63 formed between the proximal and distal inclined surfaces 61 and 62. The front protrusions 41 and 43 are defined by the front proximal inclined surfaces 61, the front distal inclined surfaces 62, and the front tops 63 that move toward each other as they move away from the flat plate portions 56 of the heads 33 and 34. The rear protrusions 42 and 44 are defined by the rear proximal inclined surfaces 61, the rear distal inclined surfaces 62, and the rear tops 63 that move toward each other as they move away from the flat plate portions 56 of the heads 33 and 34.

[0052] The distal inclined surface 62 is divided into a plurality of inclined regions 62a and 62b with different slopes, and the slope of the inclined region 62a close to the top 63 is smaller than that of the inclined region 62b far from the top 63. Figure 4 (Fastener element according to this embodiment) and Figure 5 As can be seen in conventional fastener elements, by dividing the distal inclined surface 62 into inclined regions 62a and 62b of varying inclinations, the inclined region 62a near the top 63 can be made to have a gentler slope. As will be apparent from the following description, this helps reduce the sliding resistance of the slider 9. Furthermore, the slope of the inclined region 62b is the same as that of the proximal inclined surface 61. The top 63 includes a flat surface extending along the direction in which the heads 33 and 34 protrude from the side edges 13 and 14 of the zipper tapes 11 and 12, helping to reduce the sliding resistance of the slider 9.

[0053] The fastener elements 21 and 22 further include walls 54a and 55a that restrict the vertical displacement of the rear protrusions 42 of the other fastener elements 21 and 22 accommodated in the front recess 57 (see FIG. Figure 3 and Figure 4 Similarly, the fastener elements 21 and 22 also have walls 54b and 55b, which restrict the vertical displacement of the front protrusions 41 of the other fastener elements 21 and 22 accommodated in the rear recess 58 (see Figure 4 The walls 54a, 54b, 55a, 55b extend from the mounting bases 31, 32 inward in the left-right direction, becoming increasingly narrower toward the top. The vertical widths of the front recess 57 and the rear recess 58 gradually increase as they move away from the mounting bases 31, 32.

[0054] The slider 9 engages and disengages the left and right zipper teeth 21 and 22. The slider 9 can be made of metal, resin or ceramic, or a composite of these materials. Figure 1 and Figure 6As can be seen, the slider 9 includes an upper wing plate 91, a lower wing plate 92, and a connecting post 93. Left and right front openings 94m and 94n are arranged on the left and right sides of the connecting post 93, and a rear opening 95 is arranged on the opposite side of the front openings 94m and 94n. The centerline of the slider 9 coincides with the centerline CL of the zipper 1. The connecting post 93 has a cross-sectional shape whose width gradually decreases toward the rear. Therefore, the connecting post 93 has left and right guide surfaces 93m and 93n that approach each other toward the rear. The top surface 56c of the flat plate portion 56 of the head portion 33 and 34 of the zipper elements 21 and 22 can contact the guide surfaces 93m and 93n.

[0055] In order to limit the left and right displacement of the left and right zipper elements 21 and 22, flanges (not shown) protruding downward are provided on the left and right side edges of the upper wing plate 91. Similarly, flanges 96m and 96n protruding upward are provided on the left and right side edges of the lower wing plate 92 (see FIG. Figure 6 The flange portion (not shown) on the left edge of the upper wing plate 91 and the flange portion 96m on the left edge of the lower wing plate 92 are arranged to face each other, defining a space for inserting the left fastener tape 11. The flange portion (not shown) on the right edge of the upper wing plate 91 and the flange portion 96n on the right edge of the lower wing plate 92 are arranged to face each other, defining a space for inserting the right fastener tape 12.

[0056] according to Figure 6 and Figure 7 It can be seen that, in response to the advancement of the slider 9, the left and right zipper elements 21 and 22 make initial contact alternately within the slider 9 with their respective front protrusions 41 and 43 and rear protrusions 42 and 44. Initial contact occurs as the slider 9 advances. As the slider 9 advances, the left and right zipper elements 21 and 22 enter the slider 9 through the front openings 94m and 94n of the slider 9. A connecting post 93 exists between the left and right zipper elements 21 and 22 that enter the slider 9 through the front openings 94m and 94n, separating them from each other. In response to the further advancement of the slider 9, the left and right zipper elements 21 and 22 gradually move further rearward from the left and right front openings 94m and 94n, and the gap J between them in the left and right directions gradually decreases. At a point where the left and right zipper elements 21 and 22 are a predetermined distance rearward from the connecting post 93, the left and right zipper elements 21 and 22 make initial contact. Initial contact occurs between the rear protrusion 42 of the fastener element 21 and the front protrusion 43 of the fastener element 22 (see Figure 6 ). Similarly, initial contact occurs between the front protrusion 41 of the fastener element 21 and the rear protrusion 44 of the fastener element 22 (refer to Figure 7 As a result, as described above, in accordance with the advancement of the slider 9, the left and right fastener elements 21 and 22 make initial contact alternately with the respective front protrusions 41 and 43 and the rear protrusions 42 and 44 in the slider 9.

[0057] In this embodiment, if Figure 6 As shown, when the rear protrusion 42 of the front zipper element E1 of a pair of left and right zipper elements 21 and 22 initially contacts the front protrusion 43 of the rear zipper element E2 of the pair, the rear protrusion 44 of the rear zipper element E2 does not contact the front protrusion 41 of the zipper element E3 (in other words, the zipper element E3 one element behind zipper element E2) with which the rear protrusion 44 of the rear zipper element E2 previously made initial contact. In order for the zipper elements E1 and E2 to engage with each other, the rear protrusion 42 of the front zipper element E1 must cross over the front protrusion 43 of the rear zipper element E2. As described above, the rear protrusion 44 of the rear zipper element E2 does not contact the front protrusion 41 of the zipper element E3, that is, a gap exists between them. Therefore, the rear fastener element E2 can be promoted to move more freely, and the rear protrusion 42 of the front fastener element E1 can easily cross the front protrusion 43 of the rear fastener element E2. As a result, the sliding resistance when the slider 9 moves forward is reduced.

[0058] Figure 7 Also applicable to Figure 6 Same instructions. Figure 7 As shown, when the rear protrusion 44 of the front zipper element E0 and the front protrusion 41 of the rear zipper element E1 are initially in contact with the left and right element pairs E0 and E1, the rear protrusion 42 of the rear zipper element E1 is in contact with the rear zipper element E1 that has previously made initial contact with its rear protrusion 42 (i.e., Figure 6 The gap between the rear protrusion 42 of the zipper element E1 and the front protrusion 43 of the zipper element E2 allows the zipper element E1 to move more freely, thereby reducing the sliding resistance of the slider 9 when it moves forward. Figure 6 and Figure 7 It can be seen that each fastener element makes initial contact with two fastener elements adjacently arranged on the left and right opposite sides twice in total at different timings in accordance with the forward movement of the slider 9 .

[0059] In some cases, in order to effectively reduce the sliding resistance of the slider 9 , the rear protrusion 42 of the fastener element E1 and the front protrusion 43 of the fastener element E2 come into contact at the inclined areas 62 a of their respective distal inclined surfaces 62 . Figure 7The same is true for the case where the rear protrusion 44 of the zipper element E0 and the front protrusion 41 of the zipper element E1 come into contact at the inclined area 62a of their respective distal inclined surfaces 62. The rear protrusion slides on the inclined area 62a of the front protrusion, crosses the top 63, and enters the front recess 57. The front protrusion slides on the inclined area 62a of the rear protrusion, crosses the top 63, and enters the rear recess 58. By engaging the front protrusion with the rear recess and the rear protrusion with the front recess, the left and right zipper elements E1 and E2 are engaged, thereby ensuring the horizontal pulling strength of the zipper 1. When the walls 54a, 54b, 55a, and 55b are provided, the resistance of the zipper 1 to upward push in the vertical direction can also be ensured.

[0060] In some cases, the fastener elements E1 and E2 make initial contact on the center line CL of the slider 9. This initial contact point P1 is at a first distance D1 from the rear end of the connecting post 93. The intersection point P2 of the center line CL of the slider 9 and the rear protrusion 44 of the fastener element E2 (the inclined area 62a of the distal inclined surface 62) is at a second distance D2 from the rear end of the connecting post 93 (see FIG. Figure 6 The intersection point P3 between the center line CL of the slider 9 and the front protrusion 41 of the fastener element E3 (the inclined area 62a of the distal inclined surface 62) and the rear end of the connecting column 93 is a third distance D3 (refer to Figure 6 Intersection points P2 and P3 are the intersection points when zipper elements E1 and E2 initially contact each other. The relationship of first distance D1 < second distance D2 < third distance D3 is satisfied. The relationship of second distance D2 < third distance D3 means that a gap exists between rear protrusion 44 of zipper element E2 and front protrusion 41 of zipper element E3.

[0061] The fastener elements E1 and E2 (see Figure 6 ) As the next pair of zipper teeth to make initial contact E0, E1 (refer to Figure 7 ) when the zipper elements E0 and E1, which are the next pair to make initial contact, make initial contact, the zipper element pair E1 and E2, which are the element pair that made initial contact the previous time, are in a non-contact state (specifically, a gap is generated between the rear protrusion 42 of the zipper element E1 and the front protrusion 43 of the zipper element E2). This allows the zipper element E1 to move more freely, thereby reducing the sliding resistance of the slider 9.

[0062] A design can be employed such that, when the rear protrusion 44 of the front zipper element E0 and the front protrusion 41 of the rear zipper element E1 of the left and right element pairs E0 and E1 initially contact each other within the slider 9, the rear protrusion 42 of the rear zipper element E1 is prevented from contacting the front protrusion 43 of the zipper element E2, with which the rear protrusion 42 of the rear zipper element E1 previously made initial contact. This design method includes appropriately determining the initial contact position of the zipper elements 21 and 22, for example, by shortening the first distance D1 compared to conventional methods. This design method includes appropriately determining the position of the engaging protrusions B1 and B2 away from the mounting bases 31 and 32 to adjust the first distance D1. This design method includes appropriately shaping the front protrusion 41 and the rear protrusion 42 to adjust the first distance D1 or to ensure smooth engagement of the elements, for example, by defining the distal inclined surface 62 as described above. This design method can be implemented using computer software.

[0063] Based on the above teachings, those skilled in the art can make various modifications to the embodiments. The reference numerals in the claims are for reference only and are not to be used for the purpose of limiting the scope of the claims.

Claims

1. A zipper, characterized in that: include: Left and right zipper chain tapes (3, 4), each having zipper teeth (21, 22) mounted on opposite side edges (13, 14) of the zipper tapes (11, 12), the zipper teeth (21, 22) comprising mounting bases (31, 32) mounted on the side edges (13, 14) of the zipper tapes (11, 12), and heads (33, 34) provided with engaging protrusions (B1, B2) at positions away from the side edges (13, 14) of the zipper tapes (11, 12), the engaging protrusions (B1, B2) comprising front protrusions (41, 43) protruding forward and rear protrusions (42, 44) protruding rearward; and A slider (9) is provided, which advances to engage the left and right zipper teeth (21, 22) included in the left and right zipper chain tapes (3, 4), and in response to the advancement of the slider (9), the left and right zipper teeth (21, 22) alternately make initial contact with their respective front protrusions (41, 43) and rear protrusions (42, 44) in the slider (9). When a left and right chain tooth pair (E0, E1) included in the left and right zipper chain teeth (21, 22) makes initial contact with the rear protrusion (44) of the zipper chain tooth (E0) on the front side of the left and right chain tooth pair (E0, E1) and the front protrusion (41) of the zipper chain tooth (E1) on the rear side of the left and right chain tooth pair (E0, E1), the zipper chain tooth that is one front side than the zipper chain tooth (E0) on the front side is oriented in a manner that does not intersect with the center line (CL) of the slider (9), and the rear protrusion (42) of the zipper chain tooth (E1) on the rear side does not contact the front protrusion (43) of the zipper chain tooth (E2) that is one rear side than the zipper chain tooth (E1) on the rear side.

2. The zipper according to claim 1, wherein: The engaging protrusions (B1, B2) include: proximal inclined surfaces (61) that move away from each other as they move away from the mounting bases (31, 32); distal inclined surfaces (62) that move closer to each other as they move away from the mounting bases (31, 32); and a top portion (63) that is formed separately between the proximal inclined surface (61) and the distal inclined surface (62). The distal inclined surface (62) is divided into a plurality of inclined areas (62a, 62b) with different slopes, and the inclined area (62a) close to the top (63) has a smaller slope than the inclined area (62b) far from the top (63).

3. The zipper according to claim 2, wherein: The left and right zipper elements (21, 22) make initial contact at an inclined region (62a) near the top (63).

4. The zipper according to claim 2, wherein: The top portion (63) includes a flat surface extending along a protruding direction of the head portion (33, 34) from the side edge portion (13, 14) of the fastener tape (11, 12).

5. The zipper according to claim 3, wherein: The top portion (63) includes a flat surface extending along a protruding direction of the head portion (33, 34) from the side edge portion (13, 14) of the fastener tape (11, 12).

6. The slide fastener according to any one of claims 1 to 5, wherein: The initial contact positions (P1) of the left and right zipper teeth (21, 22) are located on the center line of the slider (9).

7. The slide fastener according to any one of claims 1 to 5, characterized in that: The head portion (33, 34) includes a flat plate portion (56), the thickness of which is determined by a front surface (56a) provided with the front protrusions (41, 43) and a rear surface (56b) provided with the rear protrusions (42, 44), and is thinner than the thickness of the mounting base (31, 32). A front recess (57) is formed between the front protrusions (41, 43) and the mounting base (31, 32), and a rear recess (58) is formed between the rear protrusions (42, 44) and the mounting base (31, 32).

8. The zipper according to claim 6, wherein: The head portion (33, 34) includes a flat plate portion (56), the thickness of which is determined by a front surface (56a) provided with the front protrusions (41, 43) and a rear surface (56b) provided with the rear protrusions (42, 44), and is thinner than the thickness of the mounting base (31, 32). A front recess (57) is formed between the front protrusions (41, 43) and the mounting base (31, 32), and a rear recess (58) is formed between the rear protrusions (42, 44) and the mounting base (31, 32).

9. A method for designing a zipper, characterized in that: The zipper comprises: Left and right zipper chain tapes (3, 4), each having zipper teeth (21, 22) mounted on side edges (13, 14) of the zipper tapes (11, 12), the zipper teeth (21, 22) comprising mounting bases (31, 32) mounted on the side edges (13, 14) of the zipper tapes (11, 12), and heads (33, 34) provided with engaging protrusions (B1, B2) at positions away from the side edges (13, 14) of the zipper tapes (11, 12), the engaging protrusions (B1, B2) comprising front protrusions (41, 43) protruding forward and rear protrusions (42, 44) protruding rearward; and The slider (9) moves forward to engage the left and right zipper teeth (21, 22) included in the left and right zipper chain tapes (3, 4). In response to the advancement of the slider (9), the left and right zipper teeth (21, 22) alternately make initial contact with their respective front protrusions (41, 43) and rear protrusions (42, 44). In the design method of the zipper, when a left and right chain tooth pair (E0, E1) included in the left and right chain tooth pairs (21, 22) makes initial contact in the slider (9) with the rear protrusion (44) of the zipper tooth (E0) on the front side of the left and right chain tooth pair (E0, E1) and the front protrusion (41) of the zipper tooth (E1) on the rear side of the left and right chain tooth pair (E0, E1), the zipper tooth that is one front side of the zipper tooth (E0) is oriented in a manner not to intersect with the center line (CL) of the slider (9), and the rear protrusion (42) of the zipper tooth (E1) on the rear side does not contact the front protrusion (43) of the zipper tooth (E2) that is one rear side of the zipper tooth (E1) on the rear side.

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