Slider for invisible slide fastener

Abstract

The utility model provides a puller for an invisible zipper, which reduces contact stress between a flange and a zipper tape and is easy to pull upwards, and the top end of the flange is difficult to be clamped on the zipper tape. The slider for the invisible slide fastener is provided with a lower wing plate, a pair of left and right guide rails vertically arranged along the side edges of the lower wing plate in the left-right direction, left and right flanges extending from the upper ends of the pair of left and right guide rails in the direction of approaching each other, a guide column, and a front mounting column and a rear mounting column which protrude upwards from the guide column at intervals in the front-back direction, the front end portion of the flange is located forward of the front end portion of the guide rail, and the starting point of the front curve portion on the inner side of the flange is located rearward of the front end portion of the guide rail.

Description

Technical Field

[0001] This invention relates to a zipper pull used in an invisible zipper, wherein when the left and right zipper teeth are engaged, the engaged zipper teeth are concealed in such a way that they are not visible from the outer surface of the zipper tape. Background Technology

[0002] As with the zipper pulls used in conventional concealed zippers, there are known zipper pulls like those in Patent Document 1 or Patent Document 2.

[0003] like Figure 12 and Figure 13 As shown, the concealed zipper pull body 111 of Patent Document 1 includes: a lower wing plate 123; a guide rail 122 erected along the side edge of the lower wing plate 123; left and right flanges 121 extending from the upper end of the guide rail 122 in an approaching direction; a guide post 116; a mounting post 117 protruding upward from the guide post 116; a locking claw 118 mounted on the mounting post 117; a clamp 114 mounted on the locking claw 118; and a pull tab 113 mounted on the clamp 114.

[0004] In addition, such as Figure 13 As shown, the concealed zipper is used with the concealed zipper pull body 111, a pair of left and right zipper straps 133 sewn onto the fabric 131 for mounting the zipper, and zipper teeth 132 sewn onto each zipper strap 133. Furthermore, each zipper strap 133 has a pair of left and right strap body portions 134, a tooth mounting portion 135, and a strap fold-back portion 136 that bends into a U-shape along the length of the strap.

[0005] Regarding the zipper pull body 111 for the invisible zipper in Patent Document 2 Figure 14 This is a 3D view of the zipper pull body 111, and... Figure 12 Similarly, it includes: a lower wing plate 123; a guide rail 122 erected along the side edge of the lower wing plate 123; left and right flanges 121 extending from the upper end of the guide rail 122 in an approaching direction; a guide post 116; a mounting post 117 protruding upward from the guide post 116; a locking claw 118 mounted on the mounting post 117; a clamp 114 mounted on the locking claw 118; and a pull tab 113 mounted on the clamp 114.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 10-234429

[0009] Patent Document 2: Japanese Patent Application Publication No. 2006-102286 Summary of the Invention

[0010] However, in the concealed zipper pulls described in Patent Documents 1 and 2, when the pull head is pulled upwards while a strong lateral pulling force is applied to the zipper tape (see...), Figure 15 (Operating state), the flange of the zipper pull and the folded-back part of the zipper tape (with) Figure 13 The contact stress between the zipper tape and the corresponding part of the folded-back section 136 increases, which can sometimes cause the flange tip to get stuck on the zipper tape. In particular, when the zipper tape is made of thin fabric or coarse-weave fabric or knitted tape to make the zipper tape lighter and more breathable, the flange tip may sometimes bite into the zipper tape and become difficult to pull upwards.

[0011] Considering that in such Figure 14 When the flange 121 of the zipper pull, as shown, protrudes further forward than the guide rail 122, this phenomenon is easily caused depending on the size and shape of the protruding portion. Moreover, repeated opening and closing operations under conditions of high contact stress between the flange of such a zipper pull and the zipper tape may easily damage the zipper tape, etc.

[0012] Therefore, this utility model was made in view of the above situation, and provides a zipper pull for an invisible zipper, which reduces the contact stress between the flange of the zipper pull and the zipper tape, and is easier to pull upwards than in the past, reducing the situation where the top of the flange gets stuck in the zipper tape or bites into the zipper tape.

[0013] The inventors of this utility model investigated the reasons why the top of the flange gets stuck or bitten into the zipper tape. They found that by changing the length of the guide rail and the flange, and changing the shape of the flange, the jamming and biting of the zipper tape during the upward pulling of the zipper head can be reduced.

[0014] That is, the concealed zipper pull of this utility model has a lower wing plate (23), a pair of left and right guide rails (22) erected along the left and right side edges of the lower wing plate (23), left and right flanges (21) extending from the upper ends of the pair of left and right guide rails (22) in a direction approaching each other, a guide post (16) erected on the lower wing plate (23), and mounting posts (17, 18) arranged upward from the guide post (16), characterized in that,

[0015] The front end (37) of the flange is located in front of the front end (45) of the guide rail.

[0016] The starting point (38) of the inner front curve portion (31) of the flange is located behind the front end portion (45) of the guide rail.

[0017] In addition, in some cases, the characteristic of a concealed zipper pull is that, with respect to the dimensions W1 and W0 as defined below, the ratio of W1 / W0 is in the range of 25% to 35%.

[0018] W0: Half the full width of the slider in the left and right directions.

[0019] W1: Width in the left-right direction of the inner front curve portion (31) of the flange.

[0020] In addition, in some cases, the characteristic of the zipper pull for the concealed zipper is that the radius of curvature of the inner front curve portion (31) of the flange is in the range of 1.2 mm to 2.0 mm.

[0021] In addition, in some cases, the characteristic of the zipper pull for the invisible zipper is that the radius of curvature of the inner front curve portion (31) of the flange is larger than the radius of curvature of the outer front curve portion (32) of the flange.

[0022] In addition, in some cases, the characteristic of the zipper pull for the invisible zipper is that the shape of the front opening (13) side of the lower wing plate (23) is an elongated, approximately elliptical shape in the sliding direction of the zipper pull, with the major axis of the approximately ellipse pointing in the front-back direction of the zipper pull and the minor axis pointing in the left-right direction of the zipper pull.

[0023] In addition, in some cases, the zipper pull for the concealed zipper is characterized in that the length (D1) of the lower wing plate (23) on the front side relative to the front end (45) of the guide rail is 30% greater than the length (D0) of the zipper pull as a whole in the front-back direction.

[0024] Utility Model Effect

[0025] According to this utility model, a concealed zipper pull can be provided, which reduces the contact stress between the flange and the zipper tape, makes it easy to pull upward, and makes it difficult to produce the feeling of the flange tip getting stuck or biting into the zipper tape. Attached Figure Description

[0026] Figure 1 This is a 3D diagram of a zipper pull for a concealed zipper. (Example)

[0027] Figure 2 This is a top view of the zipper pull for a concealed zipper. (Example)

[0028] Figure 3 This is a side view of the zipper pull for a concealed zipper. (Example)

[0029] Figure 4 This is a diagram of the zipper pull of a concealed zipper as viewed from the rear. (Example)

[0030] Figure 5This is a diagram of the zipper pull of a concealed zipper viewed from the front. (Example)

[0031] Figure 6 This is a cross-sectional view of a zipper pull for a concealed zipper. (Example)

[0032] Figure 7 This diagram illustrates the positional relationship between the front end of the guide rail, the front end of the flange, and the starting point of the inner front curve of the flange in a top view (a) and a sectional view (b) of a concealed zipper pull. (Example)

[0033] Figure 8 This diagram illustrates the positional relationship between the front end of the guide rail, the front end of the flange, and the starting point of the inner front curve of the flange in the top view (a) and sectional view (b) of the zipper pull for a concealed zipper. (Previous example)

[0034] Figure 9 This is a top view showing the embodiments and conventional examples arranged in the front-to-back direction, with the upper side (a) showing the embodiments and the lower side (b) showing the conventional examples.

[0035] Figure 10 Figures (a) and (b) illustrate the relationship between the position of the chain teeth and the force acting on the pull head in the embodiments.

[0036] Figure 11 (a) and (b) are diagrams illustrating the relationship between the position of the chain teeth and the force acting on the pull head in previous examples.

[0037] Figure 12 This is a 3D diagram showing the working state of a concealed zipper pull. (Previous example)

[0038] Figure 13 This is a cross-sectional view of the zipper pull for a concealed zipper. (Previous example)

[0039] Figure 14 This is a 3D diagram of a zipper pull for a concealed zipper. (Previous example)

[0040] Figure 15 This diagram illustrates the usage status of the zipper pull for a concealed zipper. (Previous example)

[0041] Explanation of reference numerals in the attached figures

[0042] 11: Slider head body; 12: Rear opening; 13: Front opening; 14: Chain tooth passage; 16: Guide post; 17: Front mounting post; 18: Rear mounting post; 19: Slider tab mounting recess; 20: Spring mounting groove; 21: Flange; 22: Guide rail; 23: Lower wing plate; 31: Front curved section inside the flange; 32: Front curved section outside the flange; 33: Central section inside the flange; 34: Rear part of the inner surface of the flange; 35: Rear side of the flange; 37: Front end of the flange; 38: Starting point of the front curved section inside the flange; 42: Outer side of the guide rail. 43: Inner side of the guide rail; 45: Front end of the guide rail; 221: Flange (conventional example); 222: Guide rail (conventional example); 231: Front curved portion of the inner side of the flange (conventional example); 232: Front curved portion of the outer side of the flange (conventional example); 233: Central portion of the inner side of the flange (conventional example); 234: Rear portion of the inner surface of the flange (conventional example); 235: Rear side portion of the flange (conventional example); 237: Front end of the flange (conventional example); 238: Starting point of the front curved portion of the inner side of the flange (conventional example); 243: Inner side of the guide rail (conventional example). Detailed Implementation

[0043] The embodiments for carrying out this utility model will now be described in detail with reference to the accompanying drawings. It should be noted that this utility model is not limited to the embodiments described below.

[0044] In this description of the present invention, the side where the zipper teeth separate is designated as the front side, the side where the zipper teeth engage is designated as the rear side, the sliding direction of the zipper head is designated as the front-back direction (length direction), the direction orthogonal to the front-back direction and parallel to the zipper tape is designated as the left-right direction (width direction), and the direction orthogonal to the front-back direction and the left-right direction is designated as the up-down direction.

[0045] The invisible zipper pull of the present invention will be described in the following description.

[0046] Figure 1 This is a perspective view of the zipper pull body of this embodiment. Figure 2 This is a top view of the zipper pull body. Figure 3 This is a side view of the zipper pull. Figure 4 This is a picture showing the main body of the zipper pull from the rear. Figure 5 This is a picture of the main body of the slider viewed from the front. Figure 6 Viewed from the direction of the arrow Figure 3 A diagram of the cross section at line B-B.

[0047] As shown in the accompanying drawings, the zipper pull body 11 of this embodiment has a basic structure including a lower wing plate 23, a pair of left and right guide rails 22, 22 erected along the side edges of the lower wing plate 23 in the left and right directions, left and right flanges 21, 21 extending from the upper ends of the pair of left and right guide rails 22, 22 in a direction approaching each other, a guide post 16 erected from the lower wing plate 23 between the left and right flanges 21, 21, and mounting posts 17, 18 disposed above the guide post 16. The zipper pull body 11 has a front opening 13 and a rear opening 12, and the front opening 13 and the rear opening 12 form a chain tooth passage 14.

[0048] The lower wing plate 23 has its thickness direction set vertically and is symmetrical from left to right. The front side of the lower wing plate 23 (the side of the front opening 13 and the left and right sides of the guide post 16) is shaped as a slender, roughly elliptical shape in the sliding direction of the pull head. The major axis of this roughly ellipse points towards the front-rear direction of the pull head, and the minor axis points towards the left and right direction of the pull head. As a result, on the front side of the lower wing plate 23, the rounded portion of the lower wing plate 23 is significantly exposed on the left and right sides of the guide post 16.

[0049] A pair of guide rails 22, 22 are composed of curved plate-shaped components having inner guide rail surface 43 and outer guide rail surface 42. Each guide rail 22 is erected from the rear end of the lower wing plate 23 along the left and right side edges in the forward direction.

[0050] like Figure 1 As shown, the guide post 16 is erected at the center of the lower wing plate 23 in the left-right direction, at a position slightly forward of the front opening 13 of the pull head body 11. Additionally, as... Figure 2 and Figure 3 As shown, a front mounting post 17 and a rear mounting post 18 are provided on the upper surface of the guide post 16. The front mounting post 17 is generally cuboid in shape. In addition, the upper surface of the front mounting post 17 has a spring mounting groove 20 for a locking claw that extends from the front end toward the rear in a rectangular shape.

[0051] The rear mounting post 18, viewed from above, is roughly triangular in shape with the front as the base and the rear as the vertex. Viewed from the side, it is also roughly triangular in shape, higher in the front and lower in the rear. Viewed from above, an insertion hole for the locking claw is provided in the center of the triangle. A tab mounting recess 19 is formed between the front mounting post 17 and the rear mounting post 18. By mounting the locking claw and tab (or tab holder), which are integrated with the leaf spring, in the spring mounting slot 20 and the tab mounting recess 19, and securing them by clamping, it can be used as a concealed zipper pull (this is the same as the technology disclosed in Patent Document 2).

[0052] The generally concave passage-like space formed by the lower wing plate 23, a pair of left and right guide rails 22, 22 and a pair of flanges 21, 21 becomes the zipper tooth passage 14 for the zipper teeth (not shown) to pass through.

[0053] The pair of flanges 21, 21 are symmetrical from left to right, and are plate-shaped components with the thickness direction in the vertical direction. The pair of flanges 21, 21 extend inward from a pair of guide rails 22, 22 erected along the left and right sides of the lower flange 23 in a manner opposite to each other.

[0054] like Figure 2 As shown, for ease of explanation, the edge of flange 21 is divided into a rear flange portion 35, a rear inner surface portion 34, a central inner flange portion 33, a front inner curved flange portion 31, and a front outer curved flange portion 32. Specifically, firstly, the edge on the rear opening 12 side is called the rear flange portion 35. The rear inner surface portion 34 continues forward from the rear flange portion 35. Furthermore, the central inner flange portion 33 continues from the rear inner surface portion 34. This central inner flange portion 33 is a straight-line extension. The front inner curved flange portion 31 continues from the central inner flange portion 33. This front inner curved flange portion 31 is a curved extension towards the outer side of the slider body. The boundary point between the central inner flange portion 33 and the front inner curved flange portion 31 is called the starting point 38 of the front inner curved flange portion. The starting point 38 of the inner front curve of the flange is the end point of the straight section of the inner central portion 33 of the flange, and is the starting point of the curve of the inner front curve 31 of the flange. Furthermore, the inner front curve 31 reaches the front end portion 37 of the flange, and the outer front curve 32 of the flange extends further outward from the front end portion 37. In addition, when comparing and explaining the shapes of the flange and guide rail as described above, "curve" and "straight line" refer to... Figure 2 In terms of the boundary line formed when viewing the main body 11 of the pull head from above, is it a curve or a straight line?

[0055] The central portion 33 on the inner side of the flange is an inclined straight line extending in the front-rear direction. The front curved portion 31 on the inner side of the flange is generally arc-shaped. To solve the aforementioned problem of this invention, it is important that the radius of curvature R of the front curved portion 31 on the inner side of the flange is as large as possible, so that the front curved portion 31 on the inner side of the flange is a gentle curve overall. The front curved portion 32 on the outer side of the flange is generally arc-shaped. Preferably, the radius of curvature R of the front curved portion 32 on the outer side of the flange is also as large as possible, resulting in a gentle curve.

[0056] The flange front end portion 37 is the part of the flange 21 that is at the foremost point when the slider is viewed from the front-rear direction. The flange 21 has a width in the left-right direction and a thickness in the top-bottom direction. Taking its width and thickness into account, the foremost part of the flange 21 is defined as the flange front end portion 37. That is, the flange front end portion 37 can be defined as a point, a straight line (a straight line connecting the inner front curve portion 31 and the outer front curve portion 32 of the flange, parallel to the left-right direction of the slider), or a planar portion (a planar portion parallel to both the left-right and top-bottom directions of the slider). Figures 3-5 As shown, chamfers are applied to the surfaces of the rear flange portion 35, the rear inner surface portion 34, the inner central portion 33, the inner front curve portion 31, and the outer front curve portion 32 of a pair of flanges 21, 21.

[0057] Next, as Figure 6 As shown, a pair of guide rails 22, 22 are erected along the left and right sides of the lower flange 23. The inner surfaces of the sliders of the pair of guide rails 22, 22 are called guide rail inner surfaces 43, 43, which are inclined or curved surfaces appropriately designed to guide the chain teeth. Here, for ease of explanation, the part of the guide rail 22 that is the foremost when the slider is viewed in the front-rear direction is defined as the guide rail front end 45. The guide rail 22 has a thickness in the left-right direction and a thickness in the up-down direction. Taking its thickness into account, the foremost part of the guide rail 22 is defined as the guide rail front end 45. That is to say, the guide rail front end 45 may be defined as a point, a straight line (a straight line parallel to the left-right direction of the slider), or a surface (a surface parallel to the left-right and up-down directions of the slider).

[0058] As observed Figure 6 As is readily understood, the front side (front opening 13 side) of the lower wing plate 23 of the slider of this invention is shaped as a generally elongated ellipse in the sliding direction of the slider, with the major axis of the ellipse pointing towards the front-rear direction of the slider and the minor axis pointing towards the left-right direction of the slider. Alternatively, this can be expressed as "the length D1 of the lower wing plate 23 in the front direction relative to the front end 45 of the guide rail is 30% longer than the length D0 of the slider as a whole in the front-rear direction." The shape of the front side (front opening 13 side) of the lower wing plate 23 of the slider determines the extent of its extension when it is desired to extend the guide rail 22 further forward, a point that will be explained later.

[0059] Next, use Figure 7 and Figure 8This illustrates the positional relationship between the front end 45 of the guide rail of the slider, the front end 37 of the flange, and the starting point 38 of the inner front curve of the flange. Figure 7 and Figure 8 The left side shows a top view (a) of the slider body 11. Figure 7 and Figure 8 The right side shows a cross-sectional view (b) of the slider body 11. It should be noted that cross-sectional view (b) is different from... Figure 6 Similarly, the situation is observed from the direction of the arrow. Figure 3 A diagram of the cross section at line B-B.

[0060] Figure 7 and Figure 8 The reference lines Y0 and Y0' shown are the rear end reference lines of the flange, which are straight lines in the left-right direction passing through the rear ends of the flange 35 and 235. Reference lines Y1 and Y1' are straight lines in the left-right direction passing through the front ends of the flange 37 and 237. Reference lines Y2 and Y2' are straight lines in the left-right direction passing through the starting points 38 and 238 of the inner front curve of the flange. Reference lines Y3 and Y3' are straight lines in the left-right direction passing through the front ends of the guide rail 45 and 245.

[0061] (It should be noted that, as a way of indicating the figures, lines shown with the same definition in the figure labels of the conventional examples are marked with a single apostrophe. In addition, parts that are defined in the same way are indicated by adding 2 to the hundreds place of the figure number in the conventional examples.)

[0062] Furthermore, the length in the front-rear direction from the reference lines Y0, Y0' at the rear end of the flange to the front end of the flange 37, 237 (the distance between reference lines Y0, Y0' and reference lines Y1, Y1') is set as L1, L1'; the length in the front-rear direction from the reference lines Y0, Y0' at the rear end of the flange to the starting point 38, 238 of the inner front curve of the flange (the distance between reference lines Y0, Y0' and reference lines Y2, Y2') is set as L2, L2'; and the length in the front-rear direction from the reference lines Y0, Y0' to the front end of the guide rail 45, 245 (the distance between reference lines Y0, Y0' and reference lines Y3, Y3') is set as L3, L3'.

[0063] First, regarding the embodiments of this utility model, utilizing... Figure 7 This explains the positional relationship between the front end of the guide rail 45, the front end of the flange 37, and the starting point 38 of the inner front curve of the flange. Figure 7 The invisible zipper pull of the embodiment of the present invention shown determines each value L1 to L3 in a manner that satisfies the following relationship (1).

[0064] Equation (1) · · ·L1>L3>L2

[0065] In other words, in the concealed zipper pull of this utility model, the front end 37 of the flange is located in front of the front end 45 of the guide rail, while the starting point 38 of the inner front curve of the flange is located behind the front end 45 of the guide rail.

[0066] Furthermore, in the embodiment of the present invention described above, the concealed zipper pull extends forward from the inner front curve portion 31 of the flange 21 compared to the front end portion 45 of the guide rail, which is the same as in the conventional example. To avoid the phenomenon of the flange tip getting stuck or biting into the zipper tape, a problem to be solved by the present invention, it is possible to simply ensure that the inner front curve portion 31 of the flange does not extend forward compared to the front end portion 45 of the guide rail. However, if the flange 21 is too short, during the zipper closing operation, the zipper tape on the front opening 13 side will move too easily in the up and down direction (the zipper tape will move erratically in the face-back direction), making it difficult to properly and accurately guide the zipper teeth to the zipper tooth engagement position of the guide post 16. Therefore, it is impossible to shorten the flange 21 itself compared to the conventional method (that is, to shorten the front side of the flange 21). Alternatively, another idea was to remove the extension in front of the flange by extending the guide rail 22 forward compared to the past, but such a change could not be achieved due to the limitations imposed by the shape of the lower wing plate 23. In other words, as... Figure 7 (b) Figure 8 As shown in (b), in both this embodiment and in previous examples, the guide rail 22 is already extended forward to its maximum extent. If the guide rail 22 is extended further forward, the top of the guide rail 22 will extend into the inside of the zipper head in the left and right directions. This will cause another major problem: when closing the zipper, the zipper teeth on the front opening 13 side will have difficulty entering the zipper head.

[0067] Given the aforementioned constraints, reducing the phenomenon of the flange tip getting stuck on the zipper tape becomes an important technical point for solving the problem. The technical significance of the solution implemented in this utility model will be explained in detail below.

[0068] Here, in order to illustrate the technical significance of this utility model, previous examples used as comparative examples are also discussed. Figure 8 Explanation will follow, then use Figure 10 , Figure 11 This section explains the reasons why the top of the flange bites into the zipper tape and provides ideas for solutions.

[0069] Figure 8The basic structure of the conventional example described herein is largely the same as that of the present invention, except for the improvements made here. However, in order to avoid misunderstanding, the basic structure of the conventional example will be described again. The conventional example includes a lower wing plate, a pair of left and right guide rails 222, 222 erected along the side edges of the lower wing plate in the left and right directions, left and right flanges 221, 221 extending from the upper ends of the pair of left and right guide rails 222, 222 in a direction of mutual approach, a guide post erected from the lower wing plate, and a mounting post disposed above the guide post.

[0070] Furthermore, for convenience, the following portions of flange 221 are defined based on the same definitions as in the embodiment: inner front curve portion 231, outer front curve portion 232, inner central portion 233, rear portion of inner surface 234, rear side portion 235, front end portion 237, starting point 238 of inner front curve portion 238, and front end portion 245 of guide rail. Figure 8 That is indicated by the attached diagram labels.

[0071] Furthermore, the lower wing plate 23 has the same shape as the lower wing plate in the conventional example. Additionally, the guide post 16 also has the same shape as the guide post in the conventional example.

[0072] Furthermore, as an example differs from the conventional example, the starting point 238 of the inner front curve portion of the flange is located in front of the front end portion 245 of the guide rail, unlike the conventional example. That is, in the conventional example, the length L2' in the front-rear direction from the reference line Y0' to the starting point 238 of the inner front curve portion of the flange is longer than the length L3' in the front-rear direction from the reference line Y0' to the front end portion 245 of the guide rail. In other words, the relationship L1' > L2' > L3' holds.

[0073] Next, in order to clarify the technical significance of this utility model, the following is used Figure 10 and Figure 11 This will illustrate the relationship between the forces acting on the chain teeth, the zipper pull, and the zipper tape in the embodiments and conventional examples.

[0074] Figure 10 , Figure 11 It is a diagram used to illustrate the relationship between the position of the zipper teeth and the force acting on the zipper head when the zipper head is pulled upwards to close the zipper. Figure 10 These are figures of an embodiment of the present invention. Figure 11 This is a diagram from previous examples. In Figure 10 , Figure 11In the attached figures, reference numerals E1, E2, E1', and E2' represent chain teeth. The state diagrams with reference numerals E1 and E1' show the state where the chain tooth is in contact with the guide surface (inner surface 43) of the guide rail 22 (the state where the chain tooth is in contact with the guide rail 22 at its foremost guided position). Furthermore, the state diagrams with reference numerals E2 and E2' show the state where the chain tooth is not in contact with the guide surface (inner surface 43) of the guide rail 22 (the state just before the chain tooth contacts the inner surface 43 of the guide rail 22). It should be noted that, due to... Figure 11 The chain teeth in state E2' are not recorded because they are difficult to observe in (b). Furthermore, in Figure 10 , Figure 11 In the diagram, the arrow F0 represents the force acting on the zipper (e.g., the lateral pulling force generated in the zipper when the zipper pull is operated in the closing direction). Furthermore, the arrow F1 represents the stress on the guide rail 22 from the zipper tooth E1 when the zipper tooth is in the position indicated by reference numeral E1. Also, when the zipper tooth is in the position indicated by reference numeral E1, due to the fold-back portion of the zipper tape (described in prior art patent document 1)... Figure 13 The zipper tooth (136) contacts the flange 21, so the flange 21 is subjected to stress generated by this contact, which is indicated by the arrow F2. When the zipper tooth contacts the guide surface (inner surface 43 of the guide rail) of the guide rail 22 as shown in the figure E1 position, the guide rail 22 can also bear the force acting on the zipper as F1, so the force F2 acting on the flange 21 is correspondingly smaller. The force F2 acting on the flange 21 is also the force acting on the zipper tooth's fold-back portion, and the smaller F2 means that the load applied to the zipper tooth is smaller. On the other hand, when the zipper tooth is in the figure E2 position, since the zipper tooth is not in contact with the guide surface (inner surface 43 of the guide rail) of the guide rail 22, it cannot bear the force acting on the zipper as F1 on the guide rail 22, and thus it is subjected to the force acting on the zipper as the force F2 acting on the flange 21. Therefore, considering that the force acting on the zipper tooth's fold-back portion is also correspondingly larger. However, in this embodiment, since the starting point 38 of the inner front curve of the flange is located behind the front end 45 of the guide rail, when the zipper tooth is located at reference numeral E2, the portion of the zipper tape that contacts the flange 21 transforms into a gentle curve called the "inner front curve 31 of the flange." The zipper tape has been guided by the "inner front curve 31 of the flange," causing its direction of travel to change significantly from the front-to-back direction to the left-to-right direction. Therefore, the force component acting between the flange 21 and the folded-back portion of the zipper tape decreases, and consequently, the load acting on the folded-back portion of the zipper tape also decreases.

[0075] Next, we will use a previous example to illustrate the examination related to the forces acting on the zipper tape described above. Figure 11In the case where the zipper tooth is in the state indicated by reference numeral E1', the zipper tooth is in contact with the guide surface (inner surface 243 of the guide rail) of the guide rail 222. Therefore, similar to the embodiment described above, the guide rail 222 can also bear the force acting on the zipper as F1', and the stress F2' acting on the flange 221 is correspondingly smaller. However, if the structure is as in the conventional example where L2' > L3', a region ΔY will occur where the zipper tooth is not guided by the guide rail 222 even before the flange 221 transforms into the "front curved section 231 of the inner flange". This region ΔY is as follows: Figure 11 As shown, this is the area between the front end 245 of the guide rail and the starting point 238 of the inner front curve of the flange (between the left-right direction line Y3' passing through the front end 245 of the guide rail and the left-right direction line Y2' passing through the starting point 238 of the inner front curve of the flange). The chain tooth indicated by reference numeral E2' shows the state of the chain tooth located in this region ΔY. Since this chain tooth E2' is not guided by the guide rail 222, the guide rail 222 cannot bear the lateral tension of the zipper at this chain tooth position, and the flange 221 must bear most of the lateral tension. Moreover, in this region ΔY, the flange 221 has not yet become the inner front curve 231 of the flange, but rather the inner central portion 233 of the flange. The inner center portion 233 of the flange is a straight edge extending more in the front-back direction than in the left-right direction of the zipper pull. Therefore, the component force acting between the flange 221 and the folded portion of the zipper tape is not significantly mitigated, resulting in a large load on the folded portion of the zipper tape. This force is as follows: Figure 11 The Fmax arrow is shown as shown. It is assumed that Fmax corresponds to the combined size of F1' and F2'. In this way, in previous examples, a region with a very large load acting on the zipper tape's fold-back section was created.

[0076] As analyzed above, the region ΔY in the previous example becomes the flange range (ΔY) that must bear the high load by the fold-back portion of the zipper tape. Therefore, this region ΔY will be referred to as the "high-load flange range ΔY" below. As mentioned above, it is believed that in the previous example, within the high-load flange range ΔY, almost all the lateral tension of the zipper tape is borne by the flange side. Therefore, the contact stress between the flange and the zipper tape is high, resulting in the phenomenon that the flange gets stuck on the zipper tape.

[0077] On the other hand, according to Figure 10 In this embodiment, the relationship L3 > L2 is satisfied, so no flange range (ΔY) is generated. In addition, in this embodiment, the flange curve has become gentler at the position of the chain tooth E2 (becoming a state of inclination that extends in the left and right direction rather than the front and back direction), so the component force received from the external force F0 (the component force acting between the flange 21 and the folded part of the zipper tape) is small.

[0078] In other words, at the moment when the chain teeth pass through the front end 45 of the guide rail, the lateral tension is almost entirely borne by the zipper tape. However, since the zipper tape is already at a point where the R is gentle in the middle of the front curve 31 inside the flange at that moment, the contact stress applied to the zipper tape is reduced. Therefore, it is believed that the adverse phenomena that occurred in the previous example will not occur.

[0079] Furthermore, this embodiment also has the feature of further mitigating the adverse phenomena that occurred in the conventional example by including other features, therefore, this will be discussed in the following usage. Figure 9 Please provide an explanation. Figure 9 This diagram illustrates improvements to the flange portions of a concealed zipper pull based on an embodiment of the present invention and a conventional example, from the perspective of designing the length in the left-right direction rather than the front-back direction.

[0080] Figure 9 The upper side (a) is an embodiment, and the lower side (b) is a conventional example. The reference numerals in the figures, which are included for the purpose of comparing the two, are described below.

[0081] X0: Center line in the width direction (left-right direction) of the slider body

[0082] X1: A straight line in the front-rear direction passing through the starting point 38 of the front curve on the inner side of the flange. X1': A straight line in the front-rear direction passing through the starting point 238 of the front curve on the inner side of the flange.

[0083] X2: A straight line passing through the front end 37 of the flange in the front-rear direction.

[0084] X2': A straight line passing through the front end 237 of the flange in the front-rear direction.

[0085] X3: A straight line passing through the end of the slider body in the width direction in the front-back direction.

[0086] W0: Half the full width of the slider in the left and right directions (distance between lines X0 and X3)

[0087] W1: The width of the front curved portion 31 inside the flange in the left-right direction (the distance between lines X1 and X2).

[0088] W1': The width of the front curved portion 231 inside the flange in the left-right direction (the distance between lines X1' and X2').

[0089] like Figure 9As shown, in this embodiment of the invention, the width W1 of the inner front curved portion 31 of the flange in the left-right direction is designed to be larger compared to the conventional embodiment. This allows the fold-back portion of the zipper tape to be guided more smoothly along the inner front curved portion 31 of the flange, which has a larger radius of curvature. Therefore, even when the zipper pull is operated to close the zipper under a strong pulling force, the force on the fold-back portion of the zipper tape from the flange 21 of the zipper pull is reduced compared to the conventional embodiment. Furthermore, specifically, the W1 / W0 ratio in this invention is preferably 25% to 35%. In contrast, the W1' / W0 ratio in the conventional embodiment is 22%.

[0090] Furthermore, through the above-described design improvements, the radius of curvature of the inner front curve portion 31 of the flange can be larger than that of the conventional embodiment. Specifically, the radius of curvature of the inner front curve portion 31 of the flange in the embodiment of the present invention is preferably set to a value range of 1.2 mm to 2.0 mm. In addition, the radius of curvature of the inner front curve portion 231 of the flange in the conventional example is R = 1.0 mm.

[0091] Furthermore, in this embodiment of the invention, the radius of curvature of the inner front curve portion 31 of the flange is larger than the radius of curvature of the outer front curve portion 32 of the flange. Specifically, the radius of curvature of the inner front curve portion 31 of the flange is R = 1.5 mm, while the radius of curvature of the outer front curve portion 32 of the flange is R = 0.4 mm.

[0092] Therefore, if the zipper pull of the present invention is used, the folded-back portion of the zipper tape contacts the flange portion with a gentler curvature, thus allowing it to slide more smoothly on the surface of the inner front curve portion 31 of the flange compared to the past.

[0093] As described above, according to this invention, the contact stress between the flange and the zipper tape can be reduced compared to the past, making it easier to pull upwards. In addition, even when the zipper tape is made of thin fabric or fabric with coarse mesh, an invisible zipper can be achieved where the tip of the flange is difficult to get stuck or bite into the zipper tape.

[0094] This utility model is not limited to the above-described embodiments. Any technology that can be recognized by those skilled in the art as being substantially the same as or having the same effect as the technologies described in the embodiments of this utility model can also be appropriately utilized, used as a substitute technology, or added in an additional manner.

Claims

1. A concealed zipper pull, comprising a lower wing plate (23), a pair of left and right guide rails (22) erected along the side edges of the lower wing plate (23) in a left-right direction, left and right flanges (21) extending from the upper ends of the pair of left and right guide rails (22) in a direction approaching each other, a guide post (16) erected on the lower wing plate (23), and mounting posts (17, 18) arranged upward from the guide post (16), characterized in that, The front end (37) of the flange is located in front of the front end (45) of the guide rail. The starting point (38) of the inner front curve portion (31) of the flange is located behind the front end portion (45) of the guide rail.

2. The zipper pull for an invisible zipper according to claim 1, characterized in that, Regarding the dimensions W1 and W0 as defined below, the ratio of W1 / W0 is in the range of 25% to 35%. W0: Half the full width of the slider in the left and right directions. W1: The width of the front curved portion (31) inside the flange in the left and right directions.

3. The zipper pull for an invisible zipper according to claim 1 or 2, characterized in that, The radius of curvature of the inner front curved portion (31) of the flange is in the range of 1.2 mm to 2.0 mm.

4. The zipper pull for an invisible zipper according to claim 1 or 2, characterized in that, The radius of curvature of the inner front curve portion (31) of the flange is larger than the radius of curvature of the outer front curve portion (32) of the flange.

5. The zipper pull for an invisible zipper according to claim 1 or 2, characterized in that, The shape of the front opening (13) side of the lower wing plate (23) is an elongated, approximately elliptical shape in the sliding direction of the pull head, with the major axis of the approximately ellipse pointing in the front-rear direction of the pull head and the minor axis pointing in the left-right direction of the pull head.

6. The zipper pull for an invisible zipper according to claim 1 or 2, characterized in that, Compared to the front end (45) of the guide rail, the length (D1) of the lower wing plate (23) on the front side in the front direction is 30% greater than the length (D0) of the entire pull head in the front direction.

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