Zipper longitudinal section, zipper, and method for manufacturing limit section and zipper

Abstract

Zipper longitudinal section (2a, 2b), comprising: a support belt (3a, 3b) which is equipped with a coupling element (4a, 4b); and a limiting part (5a, 5b) which adheres to the support belt (3a, 3b) in a position adjacent to the dome member (4a, 4b), wherein the boundary part (5a, 5b) has a magnetic body (30a, 30b) and a base section (6a, 6b) in which the magnetic body (30a, 30b) is completely embedded, the base section (6a, 6b) has a first and a second resin section (41a, 41b, 42a, 42b) which are distinguishable on the basis of an interface formed between the first and the second resin section (41a, 41b, 42a, 42b), and the first and second resin sections (41a, 41b, 42a, 42b) are arranged such that they cover a first and a second area (31, 32), which are separated from each other, on at least one surface (34, 35, 36) of the magnetic body (30a, 30b), wherein which at least one surface (34, 35, 36) of the magnetic body (30a, 30b) is covered in a complementary manner by the first and second resin sections (41a, 41b, 42a, 42b).

Description

[Technical field]

[0001] The present disclosure relates to a zipper longitudinal part, a zipper, and methods for manufacturing a limiting part and a zipper. [State of the art]

[0002] There is a need to improve the user-friendliness associated with opening and closing zippers.

[0003] Patent reference 1 relates to a limiting element of a zipper and discloses that simplified operation of limiting elements is enabled by means of magnets. In particular, when a first and a second base element are stacked, a magnetic attraction or repulsion is created between them, and the second base element rotates relative to the first base element. At this moment, a second insert of the second element pivots towards a gap between the upper and lower flanges of a slider. In this way, the load on the limiting element required to close the zipper would be reduced. The permanent magnets are housed in housing sections of the base elements.

[0004] Patent specification 2 discloses that a magnet is attached by fitting it into a recess of a sliding contact plate.

[0005] Patent literature 3 discloses a zipper with magnetically attracted elements. An elastomer containing non-magnetized particles is injection-molded, followed by the application of a magnetic field to magnetize these particles. The strength and position of the magnetic field are controlled such that the magnetized particles form a linear cluster within the elastomer. Subsequently, the elastomer is solidified and further processed to form it into coupling links.

[0006] Patent literature 4 discloses that a non-magnetized magnet is attached to a tie and then magnetized.

[0007] Another zipper utilizing magnetic force is known from CN 2 16 907 067 U. [Bibliography][Patent Specifications] [PTL 1] International Publication WO 2019 / 175 944 A1 [PTL 2] Japanese Patent JP 4 152 216 B2 [PTL 3] US Patent US 10 709 212 B1 [PTL 4] Registered Japanese utility model JP 3 078 682 U [Summary][Technical Problem]

[0008] One aspect of the present disclosure aims to reinforce a structure that holds a magnetic body in a limiting part. [Solution to the problem]

[0009] A zipper longitudinal section according to one aspect of the present disclosure comprises: a support belt provided with a coupling element; and a limiting section adhering to the support belt in a position adjacent to the coupling element, the limiting section comprising a magnetic body and a base section in which the magnetic body is completely embedded, the base section comprising a first and a second resin section distinguishable on the basis of an interface formed between the first and the second resin section, and the first and the second resin section being arranged such that they cover a first and a second region, respectively, which are separate from each other, on at least one surface of the magnetic body. The first and the second resin section may each directly cover the first and the second region.The respective resin sections and the respective areas can be in direct contact, and there can be no gap between the section and the area.

[0010] According to the invention, at least one surface of the magnetic body is covered in a complementary manner by the first and second resin sections; in some embodiments, the first and second regions of each surface of the magnetic body are covered by the first and second resin sections, respectively. In some embodiments, the first resin section has one or more exposed surfaces that are not covered by the second resin section. The exposed surface may extend radially with respect to a central axis of the magnetic body. In some embodiments, the second resin section has an exposed surface that extends radially with respect to a central axis of the magnetic body. In some embodiments, a layered section of the first and second resin sections is provided on a central axis of the magnetic body.

[0011] In some embodiments, the base section has an axial projection in which the magnetic body is embedded, and an upper surface of the axial projection has exposed surfaces of the first and second resin sections. The base section may have an axial projection in which the magnetic body is embedded, and a side wall of the axial projection may be configured by alternating walls of the first resin section and walls of the second resin section in a circumferential direction. The base section may have a recess with a bottom surface, the magnetic body being arranged directly below the bottom surface, and the bottom surface of the recess may have exposed surfaces of the first and second resin sections.

[0012] In some embodiments, (a) the base section is provided with an axial projection in which the magnetic body is at least partially embedded, and a side wall of the axial projection has a wall of the first resin section and a wall of the second resin section; or (b) the base section is provided with a recess having a bottom surface, the magnetic body being arranged directly below the bottom surface, and the bottom surface of the recess having an exposed surface of the first resin section and an exposed surface of the second resin section.

[0013] The first resin section can be designed to receive the magnetic body, and the second resin section can form a remaining boundary portion that differs from the first resin section. The magnetic body can be a permanent magnet having a pair of principal faces arranged to intersect a magnetic axis and a side face connecting the outer edges of the principal faces of the pair.

[0014] A zipper according to another aspect of the present disclosure is a zipper comprising a pair of zipper longitudinal parts and a slider movable to open and close the pair of zipper longitudinal parts, each of the zipper longitudinal parts of the pair being one of the zipper longitudinal parts described above, in which a permanent magnet is provided as the magnetic body, a pair of boundary parts in the pair of zipper longitudinal parts containing the permanent magnets such that they are magnetically attracted to each other to cause the boundary parts of the pair to stack up, one of the boundary parts of the pair having an inclined surface inclined along an extent in a circumferential direction with respect to a magnetic axis of the permanent magnet, and the other of the boundary parts of the pair having a sliding section.which slides on the inclined surface according to a magnetic attraction between the permanent magnets of the limiting parts of the pair.

[0015] A method for producing a limiting part according to a further aspect of the present disclosure is a method for producing a limiting part that adheres to or is to be attached to a support band of a zipper longitudinal part, wherein the method comprises: performing an injection molding such that a magnetic body is embedded in the limiting part; and applying a magnetic field to the limiting part to magnetize the magnetic body after injection molding.

[0016] According to the invention, the injection molding process comprises at least two injection molding operations, wherein a first area of ​​at least one surface of the magnetic body is covered by a first resin section during a first injection molding operation and a second area of ​​at least one surface of the magnetic body is covered by a second resin section during a subsequent injection molding operation.

[0017] A method for manufacturing a zipper according to yet another aspect of the present disclosure is a method for manufacturing a zipper with magnetically attracted but separable limiting parts, wherein the method comprises: combining zipper longitudinal parts of one of the types described above as a pair; and applying a magnetic field with a constant direction to limiting parts contained and coupled in the pair to magnetize magnetic bodies embedded in the respective limiting parts. [Advantageous effects of the invention]

[0018] According to one aspect of the present disclosure, it is facilitated that a structure which holds a magnetic body in a limiting part is reinforced. [Brief description of the drawings] [ Fig. 1] Fig. Figure 1 is a schematic top view of a zipper in an open state according to one aspect of the present disclosure. [ Fig. 2] Fig. Figure 2 is a schematic view of the left zipper length from below. [ Fig. 3] Fig. Figure 3 is a schematic view of the left zipper length from the right side. [ Fig. 4] Fig. Figure 4 is a schematic view of the right zipper longitudinal section from below. [ Fig. 5] Fig. Figure 5 is a schematic cross-sectional view of the left zipper longitudinal section, showing a schematic cross-sectional design of a left boundary section along a dashed line X5-X5 in Fig. 1 shows. [ Fig. 6] Fig. Figure 6 is a schematic cross-sectional view of the right zipper longitudinal section, showing a schematic cross-sectional design of a right boundary section along a dashed line X6-X6 in Fig. 4 shows. [ Fig. 7] Fig. Figure 7 is a schematic view showing that an insert of the right limiting part is automatically inserted into the interior of a slide according to a magnetic attraction between permanent magnets in the left and right limiting parts. [ Fig. 8] Fig. Figure 8 is a schematic flowchart showing a process for manufacturing a boundary part. [ Fig. 9] Fig. Figure 9 is a schematic process diagram showing that a first area on each surface of the left magnetic body is covered by a first resin section through a first injection molding process. [ Fig. 10] Fig. Figure 10 is a schematic process diagram showing that a first area on each surface of the right magnetic body is covered by a first resin section through a first injection molding process. [ Fig. 11] Fig. 11 is a schematic process diagram showing that a second injection molding process creates a second area (in Fig. 11 not shown) on each surface of the left magnetic body is covered by a second resin section and the first resin section is also covered by the second resin section. [ Fig. 12] Fig. Figure 12 is a schematic process diagram showing that, through a second injection molding process, a second area on each surface of the right magnetic body is covered by a second resin section, and the first resin section is also covered by the second resin section. [ Fig. 13] Fig. Figure 13 is a schematic perspective view of a first molded part, in which the left magnet body is partially covered by the first resin section. [ Fig. 14] Fig. 14 is a schematic top view of the in Fig. 13 first molded part shown. [ Fig. 15] Fig. 15 is a schematic view of the in Fig. 13 first molded part shown from below. [ Fig. 16] Fig. 16 is a schematic cross-sectional view of the in Fig. 15 first molded part shown, which has a cross-section along a dashed line X16-X16 in Fig. 15 shows. [ Fig. 17] Fig. 17 is a schematic cross-sectional view of the in Fig. 15 first molded part shown, which has a cross-section along a dashed line X17-X17 in Fig. 15 shows. [ Fig. 18] Fig. Figure 18 is a schematic perspective view of the first molded part, in which the right magnetic body is partially covered by the first resin section. [ Fig. 19] Fig. 19 is a schematic top view of the in Fig. 18 first molded part shown. [ Fig. 20] Fig. 20 is a schematic view of the in Fig. 18 first molded part shown from below. [ Fig. 21] Fig. 21 is a schematic cross-sectional view of the in Fig. 20 shown first molded part, which has a cross-section along a dashed line X21-X21 in Fig. 20 shows. [Description of the embodiments]

[0019] Various embodiments and features are described below with reference to the drawings. A person skilled in the art would be able to combine the respective embodiments and / or features without requiring excessive description and would recognize the synergistic effects of such combinations. Overlapping descriptions among the embodiments are generally omitted. Referenced drawings primarily serve to describe the inventions and have been simplified for ease of presentation. The respective features are to be understood as universal features that apply not only to a zipper longitudinal section and limiting section disclosed herein, but also to other zipper longitudinal sections and limiting sections not disclosed in this description.

[0020] In the following descriptions, the forward-backward direction corresponds to one direction (upward-downward direction, if Fig. (viewed from the front) in which a slider moves to open and close a zipper. The left-right direction is a direction (left-right direction when viewed from the front). Fig. (viewed from the front, 1) that runs perpendicular to the forward-backward direction and parallel to a belt surface of a conveyor belt. An up-down direction is a direction that runs perpendicular to the forward-backward direction and perpendicular to a belt surface of the conveyor belt. The belt surface of the conveyor belt is a surface used to define the thickness of the conveyor belt.

[0021] Zipper 1 has left and right zipper sections 2a and 2b and a slider 40 for opening and closing zipper 1. When slider 40 moves forward, zipper 1 closes, and the left and right zipper sections 2a and 2b are coupled. When slider 40 moves backward, zipper 1 opens, and the left and right zipper sections 2a and 2b are uncoupled.

[0022] The slide valve 40 has an upper plate 81, a lower plate, and a gate wedge 83 connecting the upper plate 81 and the lower plate. Front openings are arranged on the left and right sides of the gate wedge 83. A rear opening is arranged on the opposite side of these front openings. An insert 7a, described below, is inserted into the interior of the slide valve 40 through the rear opening. Flanges 86 are arranged on the left and right side edges of the upper plate 81, projecting downwards and extending along the forward-backward direction. Flanges are arranged on the left and right side edges of the lower plate, projecting upwards and extending along the forward-backward direction. An insert 7b, described below, is inserted into the space between these upper and lower flanges.When the slide 40 is positioned forward of the limiting parts 5a and 5b, the support strap 3b has been inserted into the space between the upper and lower flanges of the slide 40.

[0023] Each of the zipper longitudinal sections 2a and 2b has a carrier belt 3a, 3b equipped with a coupling element 4a, 4b, and a limiting element 5a, 5b that adheres to the carrier belt 3a, 3b at a position adjacent to the coupling element 4a, 4b. The carrier belt is a strap-like element that is soft and extends in the forward-backward direction and is a woven, knitted, or mixed fabric. The coupling element is designed to engage with a partner element and is, for example, a resin or metal element or a helical element made of helically wound monofilament. The coupling element is joined to the carrier belt by injection molding, compression molding, sewing, or gluing. The coupling element shown is a resin element with a base section, a neck, and a head. The base section adheres to the side edge of the carrier belt.

[0024] The boundary sections 5a and 5b can be detachably coupled to each other. Each of the boundary sections 5a and 5b has a base section 6a, 6b and an insert 7a, 7b that extends away from the base section 6a, 6b in the direction of the coupling element 4a, 4b (i.e., forwards). The magnetic bodies 30a and 30b are each completely embedded in the base sections 6a and 6b, respectively (see Fig. 5 and Fig. 6) The magnetic bodies 30a and 30b have different shapes, with magnetic body 30a being cylindrical and magnetic body 30b being disc-shaped. As described above, insert 7a is inserted into the interior of the slide 40 through the rear opening of the slide 40. Insert 7b is inserted into the interior of the slide 40 through the space between the flange of the upper plate 81 and the flange of the lower plate. Note that the designs of the limiting parts 5a and 5b can be reversed in the left-right direction.

[0025] The base section 6a of the left boundary part 5a has an axial projection 11 in which the magnetic body 30a is embedded. The axial projection 11 is arranged so that it projects downwards. The base section 6b of the right boundary part 5b has a recess 21 with a bottom surface 21b, wherein the magnetic body 30b is arranged directly below the bottom surface 21b. The recesses in the base sections of the Fig. The embedded magnetic bodies in the boundary parts shown in Figures 1 to 5 and 6 are permanent magnets produced by magnetizing unmagnetized magnetic bodies (the magnetic bodies 30a and 30b may be referred to below as permanent magnets 30a and 30b). Therefore, if the base section 6a of the left boundary part 5a and the base section 6b of the right boundary part 5b are positioned so that they are spatially close to each other (e.g., if the base section 6b is located below the base section 6a), a magnetic attraction is caused between the permanent magnet 30b of the base section 6b and the permanent magnet 30a of the base section 6a, so that the base sections 6a and 6b can be stacked on top of each other, allowing the axial projection 11 of the base section 6a to fit into the recess 21 of the base section 6b.

[0026] The permanent magnet 30a, 30b can be a rare-earth magnet, such as a neodymium magnet. The permanent magnet 30a, 30b has, as a total of 3 surfaces, a pair of main surfaces 34 and 35, which are arranged such that they intersect a magnetic axis AX1, AX2 (or which define a thickness of the permanent magnet), and a side surface 36, which connects the outer edges of the main surfaces 34 and 35 of the pair (see Fig. 5 and Fig. 6) The side surface 36 extends along the magnetic axis AX1, AX2 at a position radially outside the magnetic axis AX1, AX2 to connect the outer edge of the main surface 34 and the outer edge of the main surface 35.

[0027] The magnetic axis AX1, AX2 of the permanent magnet 30a, 30b corresponds to a central axis of the magnet body 30a, 30b. The magnetic axis is an axis extending along an arrangement direction of the N-pole and S-pole of the permanent magnet and is defined based on the magnetic field lines formed around the permanent magnet. The central axis AX1 of the magnet body 30a corresponds to a central axis of the axial projection 11. The central axis AX2 of the magnet body 30b corresponds to a depth direction of the recess 21. Note that the permanent magnets 30a and 30b can have the shape of a prism or a polygonal plate. Other shapes, such as a cone, a pyramid, or a sphere, can also be used.

[0028] Base section 6a has an outer circumferential section 12 arranged around the axial projection 11. Sliding sections 13p, 13q, 13r are arranged in the outer circumferential section 12. Base section 6b has an outer circumferential section 22 arranged around the recess 21. Inclined surfaces 23p, 23q, 23r are arranged in the outer circumferential section 22. While the axial projection 11 is fitted into the recess 21 according to the magnetic attraction between the permanent magnets, as described above, the sliding section 13p, 13q, 13r and the inclined surface 23p, 23q, 23r are brought into contact, and the sliding section 13p, 13q, 13r slides down the inclined surface 23p, 23q, 23r, resulting in a rotation of the base section 6b relative to the base section 6a. It can be said that the magnetic attraction in the axial direction is converted into a rotational force about the axial direction.

[0029] Insert 7a is designed so that it is open on the right side to accommodate insert 7b. As in Fig. As shown in Figure 3, the insert 7a has an upper plate 14 and a lower plate 15, and an insertion space 16 is defined between the plates 14 and 15. As also shown in Fig. As shown in Figure 2, a rod 8a is arranged adjacent to the insert 7a on both the upper and lower sides of the support band 3a, and a flange passage is defined on both the upper and lower sides of the support band 3a. Similar to the insert 7a, the rod 8a extends forward from the base section 6a. The flange of the slide 40 is inserted into the flange passage between the insert 7a and the rod 8a, which facilitates holding the slide 40 on the insert 7a.

[0030] The insert 7b has an insertion end shaped to taper as it extends to the left away from the support band 3b, and the insertion end is smoothly inserted into the space between the right upper and lower flanges of the slide 40. A modified coupling member 4b' is connected to a front end of the insert 7b, allowing the slide 40 to move smoothly from a position above the limiting part onto the coupling members 4a and 4b. The rod 8b is connected to the insert 7b on the opposite side of the insertion end. The rod 8b is positioned to project from both the top and bottom of the support band 3b and abut the right upper and lower flanges of the slide 40. The rod 8b defines a stop position for the insert 7b to be inserted into the interior of the slide 40.

[0031] As in Fig. As shown in Figure 7, the magnetic attraction between the permanent magnet 30a of base section 6b and the permanent magnet 30b of base section 6a occurs when the slide 40 is positioned in its rearmost position (i.e., when the insert 7a is inserted into the interior of the slide 40) and when the base section 6b is positioned below the base section 6a. This magnetic attraction allows the base section 6a and the base section 6b to be stacked on top of each other and allows the axial projection 11 of the base section 6a to fit into the recess 21 of the base section 6b. As the axial projection 11 is fitted into the recess 21 (i.e. as the base sections 6a and 6b approach each other in the axial direction), the sliding section 13p, 13q, 13r and the inclined surface 23p, 23q, 23r are brought into contact, and the sliding section 13p, 13q, 13r slides down the inclined surface 23p, 23q, 23r.Accordingly, the base section 6b rotates counterclockwise relative to the base section 6a, and the insert 7b is inserted into the interior of the slide 40 via the gap between the right upper and lower flanges of the slide 40. As the slide 40 moves forward, the insert 7b is inserted into an insertion chamber 16 of the insert 7a, and the left and right limiting parts 5a and 5b are coupled. As the slide 40 continues to move forward, the left and right coupling members 4a and 4b are engaged with each other.

[0032] The sliding sections 13p, 13q, 13r are arranged circumferentially around the magnetic axis AX1 of the permanent magnet 30a. Similarly, the inclined surfaces 23p, 23q, 23r are arranged circumferentially around the magnetic axis AX2 of the permanent magnet 30b. Each inclined surface tilts as it extends circumferentially around the magnetic axis AX2 of the permanent magnet 30b. The sliding section 13p, 13q, 13r slides (sinks) along the inclined surface 23p, 23q, 23r according to the magnetic attraction between the permanent magnets 30a and 30b. The arrangement of three sliding sections provides increased rotational stability, but the arrangement of only one sliding section might also be sufficient. The same applies to the inclined surface. Of course, it is also possible to omit the sliding sections and the inclined surfaces and to rotate the base section 6b by hand relative to the base section 6a.The permanent magnets 30a and 30b would be aligned so that the respective magnetic axes AX1 and AX2 coincide, thus eliminating the need for the axial projection 11 and the recess 21.

[0033] The base section 6a has a guide 17 located beside and behind the insert 7a, which, like the axial projection 11, projects downwards. The guide 17 is positioned to define a groove spatially connected to the opening of the insert 7a and has a guide surface inclined downwards to the right. If the base sections 6a and 6b attract each other magnetically, the insert 7b may be placed on the guide surface of the guide 17. Even in this case, the insert 7b can sink down on the guide surface of the guide 17 and pivot clockwise to the right. The insert 7b can then penetrate the interior of the slide 40 through the gap between the upper and lower right flanges of the slide 40, similar to what was described above, after sinking down over the guide surface of the guide 17.

[0034] In the present embodiment, the base section 6a has a first and a second resin section 41a and 42a, which are distinguishable on the basis of an interface formed between the sections (see Fig. 2, Fig. 3 and Fig. 5) The first and second resin sections 41a and 42a are arranged such that they cover a first and a second area 31 and 32 respectively, which are separated from each other, on at least one surface of the magnetic body 30a (see Fig. 17) This allows the increase in thickness of the resin section around the magnetic body 30a to be suppressed and a structure of the limiting part 5a for holding the magnetic body 30a to be reinforced. In particular, the thicknesses of the first and second resin sections 41a, 41b, 42a, 42b can be increased on at least one surface of the magnetic body 30a, and the second resin section 42a, 42b can be inserted between the first resin sections 41a and 41b, providing a reinforced connection between them. Compared to a case where a magnetic body is housed in a recess and this recess is closed by a cover, a structure required for securing the cover (e.g., pin and slot with which the pin is joined) can be omitted.

[0035] To be perfectly clear: If the first region 31 is covered by the first resin section 41a, the first resin section 41a is in direct contact with the first region 31 (there is no gap between them). Similarly, if the second region 32 is covered by the second resin section 42a, the second resin section 42a is in direct contact with the second region 32 (there is no gap between them). The first and second resin sections 41a and 42a can be made of the same resin material, but are distinguishable based on an interface formed between the sections. The second region 32, for example, can be formed based on contact between the magnetic body and a mold surface during an initial injection molding process.

[0036] The same descriptions apply to base section 6b as described above. The descriptions above should be read with the corresponding substitutions of base section 6a, magnetic body 30a, and the first and second resin sections 41a, 42a by base section 6b, magnetic body 30b, and the first and second resin sections 41b, 42b, and overlapping descriptions are omitted. Fig. 1, Fig. 4 and Fig. 6 are used for basic section 6b. Fig. Figure 6 shows that on each of the main surfaces 34 and 35 of the magnetic body 30b, the first area 31 is covered by a first resin section 41b and a second area 32 by a second resin section 42b.

[0037] At least one surface of the permanent magnet 30a, 30b (e.g., a main surface and / or a side surface) can be covered in a complementary manner by the first resin section 41a, 41b and the second resin section 42a, 42b. This prevents the surface of the permanent magnet 30a, 30b from being covered by both the first and second resin sections and remaining partially exposed in the boundary section 5a, 5b. Alternatively, this would eliminate the need to provide an additional resin section to suppress this exposure. Preferably, on each surface (i.e., all surfaces) of the main surface 34, 35 and the side surface 36 of the permanent magnet 30a, 30b, the first and second regions 31, 32 are covered by the first and second resin sections 41a, 41b, 42a, 42b, respectively.

[0038] The first resin section 41a, 41b can have one or more exposed surfaces that are not covered by the second resin section 42a, 42b and are exposed within the boundary section 5a, 5b. There is a limitation on the thickness of the resin section around the magnetic body 30a, 30b; however, the first resin section 41a, 41b can be shaped to be thicker, thus ensuring sufficient strength. Note that the exposed surface of the first resin section 41a, 41b can be formed by contact between the first molded part and a mold surface during a second injection molding operation. To suppress defective parts, the exposed surface of the first resin section 41a, 41b or the exposed surface of the second resin section 42a, 42b preferably extends radially with respect to the central axis of the magnetic body 30a, 30b.

[0039] Further detailed descriptions are given below. As in Fig. As shown in Figure 1, the bottom surface 21b of the recess 21 in the base section 6b is formed by a combination of the exposed surface of the first resin section 41b and the exposed surface of the second resin section 42b. On the bottom surface 21b of the recess 21, the first resin section 41b has an exposed surface formed in a radial (Y-shaped) pattern. This radial exposed surface has a central surface and a plurality of extension surfaces that extend radially outward from the central surface. The exposed surface of the second resin section 42b is arranged between the extension surfaces. The exposed surfaces of the second resin section 42b are arranged at constant angular intervals in the circumferential direction around the central axis AX2 of the magnetic body 30b.Thus, the bottom surface 21b of the recess 21 is formed by the radial exposed surface of the first resin section 41b and the total of 3 exposed surfaces of the second resin section 42b.

[0040] As in Fig. As shown in Figure 4, the lower surface of the base section 6b on the opposite side of the recess 21 is formed by a combination of the exposed surface of the first resin section 41b and the exposed surface of the second resin section 42b. On the lower surface of the base section 6b on the opposite side of the recess 21, the second resin section 42b has an exposed surface formed in a radial (Y-shaped) pattern. The radial exposed surface has a central surface and a plurality of extension surfaces that extend radially outward from the central surface. The width of the extension surface differs between a radially inner and a radially outer position.As the expansion area extends away from the central surface, its width gradually decreases, and then suddenly increases after passing a boundary between the radially inner and radially outer positions. The radially outer region of the expansion area is fan-shaped. The exposed surfaces of the first resin section 41b are arranged between the expansion areas. Each exposed surface of the first resin section 41b extends radially outward around the central axis AX2 of the magnetic body 30b. Therefore, the three exposed surfaces of the first resin section 41b are arranged in a radial pattern. These three exposed surfaces are positioned at constant angular intervals around the central axis AX2 of the magnetic body 30b.Thus, the lower surface of the base section 6b is formed by the radial exposed surface of the second resin section 42b and the total of 3 exposed surfaces of the first resin section 41b.

[0041] Note that on the lower surface of the base section 6b, the first resin section 41b and the second resin section 42b are stacked on the central axis AX2 of the magnetic body 30b; that is, the first resin section 41b is covered by the second resin section 42b on the central axis AX2 of the magnetic body 30b. This allows the molten resin, which will be the second resin section 42b, to flow smoothly into grooves formed in the first resin section 41b. This creates a stronger bond between the first and second resin sections, and also reinforces the structure for holding the magnetic body. Similarly, on the upper surface of the base section 6b, the first resin section 41b can be covered by the second resin section.

[0042] As in Fig. As shown in Figure 2, the upper surface and / or the side surface of the axial projection 11 is formed by a combination of the exposed surface of the first resin section 41a and the exposed surface of the second resin section 42a. On the upper surface of the axial projection 11, the exposed surface of the second resin section 42a is formed in a radial (Y-shaped) pattern. This radial exposed surface has a central surface and a plurality of extension surfaces that extend radially outward from the central surface. The exposed surface of the first resin section 41a is located between the extension surfaces. These exposed surfaces of the first resin section 41a are arranged at constant angular intervals in the circumferential direction around the central axis AX1 of the magnet body 30a.

[0043] In the side surface of the axial projection 11, the exposed surface of the first resin section 41a and the exposed surface of the second resin section 42a are arranged alternately in the circumferential direction with respect to the central axis AX1 of the magnetic body 30a. Each of the exposed surfaces of the first and second resin sections 41a, 42a is designed to extend onto both the top surface and the side surface of the axial projection 11. Therefore, the side wall of the axial projection 11 is formed by the alternating arrangement of the walls of the first resin section 41a and the walls of the second resin section 42a in the circumferential direction with respect to the central axis AX1 of the magnetic body 30a.There is a limitation on the thickness of the resin section around the magnetic body 30a, but the respective resin sections can be shaped so that they are thicker and a strength of the resin sections around the magnetic body 30a can be ensured.

[0044] Note that the first resin section 41a and the second resin section 42a are stacked on the central axis AX1 of the magnet body 30a on the side of the upper surface of the axial projection 11, i.e., the first resin section 41a is covered by the second resin section 42a. This allows the molten resin, which will be the second resin section 42a, to flow smoothly into grooves formed in the first resin section 41a. This results in a reinforced bond between the first and second resin sections, and the structure for holding the magnet body is also strengthened. Furthermore, the first and second resin sections 41a, 42a are stacked on the main surface of the magnet body 30a on the opposite side of the upper surface of the axial projection 11.

[0045] To enhance the magnetic attraction between permanent magnets 30a and 30b, the resin section can preferably be thinner on the main surface of permanent magnet 30a on the side of the upper surface of the axial projection 11, and similarly, the resin section can preferably be thinner on the main surface of permanent magnet 30b on the side of the bottom surface 21b of the recess 21. However, there is a limitation regarding the thickness of the resin section from the perspective of ensuring strength. The first and second resin sections cover the first and second regions, respectively, of a surface of the magnet body, as described above, which allows a desired thickness for the first and second resin sections to be ensured regardless of the imposed limitation on resin thickness.The first and second resin sections are not redundantly layered, thus suppressing the expansion of the boundary section. In this case, the first resin section is covered by the second resin section along the central axis of the magnet body (the magnetic axis of the permanent magnet). This allows the second resin section to flow smoothly into the grooves formed in the first resin section. Furthermore, expansion of the boundary section is suppressed because the first resin section is not covered by the second resin section to such an extent that it has no exposed surface.

[0046] The shape, position, area, and number of exposed surfaces of the first resin section 41a, 41b can be modified in various ways. The same applies to the exposed surface of the second resin section 42a, 42b. The first resin section 41a has no exposed surface on the upper surface of the base section 6a, but may have an exposed surface there.

[0047] Each zipper longitudinal part 2a and 2b (simultaneously the limiting parts 5a and 5b) can be manufactured by injection molding the limiting part and subsequently magnetizing the magnetic body (i.e., applying a magnetic force), as shown in Fig. Figure 8 shows that problems that would otherwise occur when using a permanent magnet can be avoided in the injection molding process by using a non-magnetized magnetic body. For example, when using a non-magnetized magnetic body, there is no possibility of it magnetically adhering to surrounding magnetic parts while being moved by a clamping device or gripper. It is also unnecessary to check whether a mold is magnetic or not. Magnetization can be achieved by creating a strong magnetic field using electromagnets and placing the boundary part with the embedded non-magnetized magnetic body within that field.

[0048] Injection molding can be carried out in two steps, a first and a second injection molding process. In the first injection molding process, the magnetic bodies 30a and 30b are placed into mold cavities defined by the upper and lower molds 18 and 19, as shown in Fig. 9 and Fig. Figure 10 shows that the magnetic body 30a, 30b is preferably clamped and held between the lower and upper forms 18 and 19, thereby suppressing its displacement. Note that a suitable clamping pressure is set for clamping the magnetic body 30a, 30b.

[0049] The first area 31 of the surface (e.g., the main surface 34, 35 and the side surface 36) of the magnetic body 30a, 30b is exposed in the mold cavity. The second area 32 of the surface (e.g., the main surface 34, 35 and the side surface 36) of the magnetic body 30a, 30b is in contact with the mold surface of the lower mold 18 or the upper mold 19. Molten resin flows through a gate into the mold cavity and solidifies as the upper and lower molds cool. In this way, the first molded part 60a is obtained (see Fig. 13-17) and the first molded part 60b (see Fig. 18-21). The first resin section 41a adheres to the first area 31. The first resin section 41a does not adhere to the second area 32. The second area 32 remains exposed and is not covered by the first resin section 41a.

[0050] In the second injection molding process, the first molded part 60a, 60b is placed into a mold cavity defined by the upper and lower molds 18, as shown in Fig. 11 and Fig. Figure 12 shows. Preferably, the first molded part 60a, 60b is clamped and held between the lower mold 18 and the upper mold 19, thus preventing its displacement. The second area 32 of the surface (e.g., the main surface 34, 35 and the side surface 36) of the first molded part 60a, 60b is exposed in the mold cavity. The first resin section 41a, 41b of the first molded part 60a, 60b is partially in contact with the mold surface of the lower mold 18 or the upper mold 19. This contact area of ​​the first resin section 41a, 41b will be the exposed surface of the first resin section 41a, 41b in the boundary part.

[0051] Molten resin flows through a gate into the mold cavity and solidifies as the upper and lower molds cool. This creates the boundary section 5a, 5b (simultaneously the zipper longitudinal section 2a, 2b, to which the boundary section 5a, 5b adheres). The second resin section 42a, 42b adheres to the second area 32. The second resin section 42a, 42b adheres not only to the magnetic body 30a, 30b, but also to the first resin section 41a, 41b. Note that the side edge section of the support strip 3a, 3b is also introduced into the mold cavity during the second injection molding process, causing the boundary section 5a, 5b to adhere to the support strip 3a, 3b.

[0052] With reference to the in Fig. In the first molded part 60a shown in Figures 13-17, it can be seen that each of the main surfaces 34, 35 and the side surface 36 of the magnetic body 30a is covered in a complementary manner by the first resin section 41a and the second resin section 42a. Furthermore, it can be seen that the first resin section 41a is designed to accommodate the magnetic body 30a, and the second resin section 42a forms a remainder of the boundary part 5a that differs from the first resin section 41a.

[0053] The first molded part 60a has covers 64, 65 that cover the main surfaces 34, 35 of the magnet body 30a, and a plurality of walls 66 that cover the side surface 36 of the magnet body 30a. The covers 64 and 65 are connected to each other via the plurality of walls 66. The first area 31 is larger than the second area 32 in the main surface 34 of the magnet body 30a. The same applies to the main surface 35 and the side surface 36 of the magnet body 30a. By making the first area 31 wider than the second area 32, the stability of the first molded part 60a on the lower mold 18 is improved during the second injection molding operation. Note that the covers 64, 65 and the walls 66 adhere to the respective surfaces of the magnet body 30a.

[0054] The covers 64 and 65 are provided with grooves 64a and 65a, respectively, extending radially inwards. The grooves 64a are shaped to expose the main surface 34 of the magnet body 30a in their outer circumferential region. The same applies to the grooves 65a. The first resin section 41a is thinner in the center of the cover 65, allowing the grooves 65a to be spatially connected (resulting in the formation of a Y-shaped groove). Therefore, during the second injection molding process, molten resin can flow smoothly into and through the grooves 65a. Longitudinal grooves 66a are formed between adjacent walls 66 in the circumferential direction. The longitudinal groove 66a and the groove 65a are continuous, forming a groove that extends continuously across the side surface 36 and the main surface 35 of the magnet body 30a.The longitudinal groove 66a is spatially connected to a slot between the connecting sections 62 described below, and the molten resin can flow more freely during the second injection molding process.

[0055] The cover 65 has a center 65p and a plurality of expansion sections 65q extending radially outward from the center 65p. The center 65p is thinner than the expansion section 65q, ensuring that the (three) grooves 65a are spatially connected via the center 65p described above. The expansion section 65q widens with increasing radial extension, i.e., it has a fan shape. Therefore, the groove 65a can extend radially with a substantially constant width.

[0056] The first molded part 60a can have an annular flange 61 that projects radially outward relative to the central axis AX1 of the magnet body 30a. The annular flange 61 is connected to an outer edge of the cover 64 via a plurality of connecting sections 62. The provision of the annular flange 61 allows the first molded part 60a to be gripped stably by a clamping device or gripper. The annular flange 61 can impede the flow of the molten resin during the second injection molding operation. Therefore, a groove 63 can be formed on the inside of the annular flange 61 (e.g., between the annular flange 61 and the cover 64). The molten resin can flow into the longitudinal groove 66a via a slot formed between the connecting sections 62.Note that in the example shown, the groove 64a and the groove 65a are not arranged one above the other and in a complementary manner in the circumferential direction, but this is not limited to that. That is, the groove 64a can be arranged between the adjacent grooves 65a in the circumferential direction and vice versa.

[0057] With reference to the in Fig. In the first molded part 60b shown in Figures 18-21, it can be seen that each of the main surfaces 34, 35 and the side surface 36 of the magnetic body 30b is covered in a complementary manner by the first resin section 41b and by the second resin section 42b. Furthermore, it can be seen that the first resin section 41b is designed to accommodate the magnetic body 30b, and the second resin section 42b forms a remainder of the boundary part 5b apart from the first resin section 41b.

[0058] The descriptions relating to the first molded part 60a largely also apply to the first molded part 60b, so overlapping descriptions are omitted. For example, the features that the first area 31 is larger than the second area 32, that the cover 64, 65 is provided with grooves extending radially inward, and that the cover 65 has a center 65p and a plurality of expansion sections 65q, would not be limited to the first molded part 60a, but would apply similarly to the first molded part 60b. However, unlike the first molded part 60a, the cover 64 is formed in a radial pattern, and the widths of the expansion sections 65q are essentially constant in the first molded part 60b.

[0059] The cover 64 has a center 64p and a plurality of extension sections 64q extending radially outward from the center 64p. The center 64p is shaped such that it is not thinner than the extension section 64q, and the spatial connection of the (three) grooves 64b is interrupted by the center 64p. The extension sections 64q extend radially outward and have a constant width. Therefore, the groove 64b between the extension sections 64q has the shape of a fan with a smaller width in a radially inner region and a larger width in a radially outer region. The groove 64b, the longitudinal groove 66b, and the groove 65b are spatially connected and form a groove that extends over the main surface 34, the side surface 36, and the main surface 35 of the magnetic body 30b.

[0060] The first molded part 60a, 60b is not limited to the shape shown, but can be modified to other different shapes.

[0061] The method for manufacturing a zipper is understandable to a person skilled in the art with regard to the prior art at the time of filing this application and the descriptions above, particularly with regard to the method for manufacturing the limiting parts. Specific improvements relating to the limiting part of the present application are discussed below.

[0062] Regarding the timing of the magnetization of the magnetic body 30a, 30b embedded in the limiting part, this can preferably occur after the assembly of a zipper 1 from a pair of zipper longitudinal parts. The limiting parts 5a and 5b are coupled together in the zipper 1, and the base section 6a and the base section 6b are stacked. Therefore, the magnetic body 30a of the base section 6a and the magnetic body 30b of the base section 6b are aligned at their upper and lower positions with a gap. In this state, a magnetic field with a constant direction (e.g., a magnetic field in which magnetic field lines extend along the upward-downward direction) is applied to the rear end section of the zipper 1. As shown in Fig. 5 and Fig.As can be seen in Figure 6, the lower half of the magnetic body 30a is magnetized to an S-pole (first pole) and the upper half of the magnetic body 30a to an N-pole (second pole). Similarly, the lower half of the magnetic body 30b is magnetized to an S-pole (first pole) and the upper half of the magnetic body 30b to an N-pole (second pole). The magnetic bodies 30a and 30b are prevented from being magnetized in the opposite direction with respect to the N-pole and the S-pole by applying a magnetic field with a constant direction to the rear end section of the zipper 1 in its assembled state.

[0063] Note that the unmagnetized magnetic bodies 30a and 30b have been designated as such; however, slightly magnetized magnetic bodies could also be used. The unmagnetized magnetic bodies 30a and 30b are not limited to those that generate no magnetic field at all, but could be those that generate a magnetic field with a low magnetic flux density.

[0064] Based on the above teachings, a person skilled in the art can make various modifications to the respective embodiments. Reference numerals in the claims serve only for illustration and are not to be used for the purpose of a narrow interpretation of the scope of protection of the patent claims. [Reference sign] 1 zipper 2a, 2b Zipper length section 3a, 3b Carrying strap 4a, 4b Coupling element 5a, 5b Limiting part 6a, 6b Basic section 7a, 7b deployment 30a, 30b Magnetic body (the permanent magnet) 41a, 41b First Harz section 42a, 42b Second Harz section 31 First area 32 Second area 34, 35 Main area 36 side surface

Claims

Zipper longitudinal part (2a, 2b) comprising: a carrying strap (3a, 3b) which is provided with a coupling element (4a, 4b); and a limiting part (5a, 5b) which adheres to the support belt (3a, 3b) in a position adjacent to the coupling member (4a, 4b), wherein the limiting part (5a, 5b) has a magnetic body (30a, 30b) and a base section (6a, 6b) in which the magnetic body (30a, 30b) is completely embedded, the base section (6a, 6b) has a first and a second resin section (41a, 41b, 42a, 42b) which are distinguishable on the basis of an interface formed between the first and the second resin section (41a, 41b, 42a, 42b), and the first and the second resin section (41a, 41b, 42a, 42b) are arranged such that they form a first and a second resin section, respectively.a second area (31, 32), which are separated from each other, cover at least one surface (34, 35, 36) of the magnetic body (30a, 30b), wherein the at least one surface (34, 35, 36) of the magnetic body (30a, 30b) is covered in a complementary manner by the first and the second resin section (41a, 41b, 42a, 42b). Zipper longitudinal part according to claim 1, wherein the first and second regions (31, 32) on each surface (34, 35, 36) of the magnetic body (30a, 30b) are covered by the first and second resin sections (41a, 41b, 42a, 42b), respectively. Zipper longitudinal section according to claim 1 or 2, wherein the first resin section (41a, 41b) has one or more exposed surfaces that are not covered by the second resin section (42a, 42b). Zipper longitudinal part according to claim 3, wherein the exposed surface extends radially with respect to a central axis (AX1, AX2) of the magnetic body (30a, 30b). Zipper longitudinal part according to one of claims 1 to 4, wherein the second resin section (42a, 42b) has an exposed surface extending radially with respect to a central axis (AX1, AX2) of the magnetic body (30a, 30b). Zipper longitudinal part according to one of claims 1 to 5, wherein a layering section of the first and second resin sections (41a, 41b, 42a, 42b) is provided on a central axis (AX1, AX2) of the magnetic body (30a, 30b). Zipper longitudinal part according to one of claims 1 to 6, wherein the base section (6a) has an axial projection (11) in which the magnetic body (30a) is embedded, and an upper surface of the axial projection (11) has exposed surfaces of the first and second resin sections (41a, 41b, 42a, 42b). Zipper longitudinal part according to one of claims 1 to 7, wherein the base section (6a) has an axial projection (11) in which the magnetic body (30a) is embedded, and a side wall of the axial projection (11) is designed by alternating arrangement of a wall of the first resin section (41a, 41b) and a wall of the second resin section (42a, 42b) in a circumferential direction. Zipper longitudinal part according to one of claims 1 to 8, wherein the base section (6b) has a recess (21) with a bottom surface (21b), wherein the magnetic body (30b) is arranged directly below the bottom surface (21b) and the bottom surface (21b) of the recess (21) has exposed surfaces of the first and second resin sections (41a, 41b, 42a, 42b). Zipper longitudinal part according to one of claims 1 to 9, wherein the first resin section (41a, 41b) is designed to receive the magnetic body (30a, 30b), and the second resin section (42a, 42b) forms a remainder of the limiting part (5a, 5b) which differs from the first resin section (41a, 41b). Zipper longitudinal part according to one of claims 1 to 10, wherein the magnetic body (30a, 30b) is a permanent magnet having a pair of principal surfaces (34, 35) arranged to intersect a magnetic axis (AX1, AX2) and a side surface (36) connecting outer edges of the principal surfaces (34, 35) of the pair. Zipper longitudinal part according to one of claims 1 to 11, wherein the limiting part (5a, 5b) has an insert (7a, 7b) extending from the base section (6a, 6b) towards the coupling member (4a, 4b), and the insert (7a, 7b) is designed to be inserted into the interior of the slide through a rear opening of the slide, or is designed to be inserted into the interior of the slide through a space between flanges of an upper plate and a lower plate of the slide. Zipper (1), comprising: a pair of zipper longitudinal parts (2a, 2b); and a slider movable for opening and closing the pair of zipper longitudinal parts (2a, 2b), wherein each of the zipper longitudinal parts (2a, 2b) of the pair is a zipper longitudinal part (2a, 2b) according to claim 1, in which a permanent magnet is provided as the magnet body (30a, 30b), a pair of limiting parts (5a, 5b) in the pair of zipper longitudinal parts (2a, 2b) containing the permanent magnets, such that they are magnetically attracted to each other to cause the limiting parts (5a, 5b) of the pair to stack, one of the limiting parts (5a, 5b) of the pair having an inclined surface (23p, 23q, 23r) inclined along an extent in a circumferential direction with respect to a magnetic axis (AX1, AX2) of the permanent magnet, and the other of the Boundary parts (5a, 5b) of the pair have a sliding section (13p, 13q, 13r),which slides on the inclined surface (23p, 23q, 23r) according to a magnetic attraction between the permanent magnets of the limiting parts (5a, 5b) of the pair. A method for manufacturing a zipper longitudinal part according to claim 1, wherein the method comprises: performing an injection molding process to manufacture the boundary part (5a, 5b) in which the magnetic body (30a, 30b) is embedded, wherein the injection molding process comprises at least two injection molding operations, namely an initial injection molding operation and a subsequent injection molding operation, wherein the first area (31) is covered by the first resin section (41a, 41b) during the initial injection molding operation, and the second area (32) is covered by the second resin section (42a, 42b) during the subsequent injection molding operation; and applying a magnetic field to the boundary part (5a, 5b) to magnetize the magnetic body (30a, 30b) after injection molding. Method for manufacturing a zipper with magnetically attracted but separable limiting parts, wherein the method comprises: combining zipper longitudinal parts according to claim 1 as a pair; and applying a magnetic field with a constant direction to limiting parts contained and coupled in the pair to magnetize magnetic bodies embedded in the limiting parts.

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