Easily-inserted double-opening zipper

Abstract

The utility model relates to an easy-to-insert double-opening zipper. The easy-to-insert double-opening zipper comprises a first tooth chain belt, a second tooth chain belt, a puller and a lower stop assembly, the lower stop assembly comprises a first lower stop piece and a second lower stop piece which are oppositely arranged, the first lower stop piece is attached to the connecting edge of a first extension belt, and the second lower stop piece is attached to the connecting edge of a second extension belt; the second lower stop piece comprises an insertion part and a limiting part which are arranged at an interval, a sliding channel penetrating through the second lower stop piece in the direction where the operation axis is located is formed between the insertion part and the limiting part, the sliding channel comprises an inlet end close to the second connecting chain teeth, and the corner, close to the inlet end, of the limiting part is of a corner cutting structure. According to the scheme, by limiting the two pull heads and guiding and limiting the relative linear positions and directions of the two pull heads when the second lower stop piece is inserted into the pull heads, the insertion success rate of the first lower stop piece is increased to achieve the easy insertion function, and by increasing the width of the inlet end, the pull heads can conveniently enter the sliding channel with the limiting function; and the pull-in fluency of the pull head is improved.

Description

Technical Field

[0001] The present application relates to the technical field of clothing, and in particular to an easy-insert double-open zipper. Background Art

[0002] A double-opening double-ended zipper is a zipper with two sliders arranged opposite to each other and capable of disengaging the meshing teeth when the two sliders move toward each other. Double-opening double-ended zippers are widely used because they are more practical than single-opening zippers. However, when the two sliders in a conventional double-opening double-ended zipper slide to the left insertion position of the bottom stop, the bottom stop assembly has insufficient limiting capacity on the sliders, resulting in the upper and lower sliders not being in a straight line when combined together, thereby affecting the normal insertion of the second bottom stop and causing the problem of difficulty in insertion. Summary of the invention

[0003] Based on this, it is necessary to provide an easy-insertion double-open zipper to address the problem that the second bottom stop is difficult to insert when the double-open double-end zipper is in the bottom stop position.

[0004] An easy-to-insert double-open zipper, the easy-to-insert double-open zipper comprising a first chain belt, a second chain belt, a slider and a bottom stop assembly. The first chain belt comprises a first extension belt and a row of first connecting chain teeth attached to the connecting edge of the first extension belt. The second chain belt comprises a second extension belt and a row of second connecting chain teeth attached to the connecting edge of the second extension belt, and the second connecting chain teeth and the first connecting chain teeth are staggered. The slider is configured to be able to reciprocate along an operating axis, and during the movement, the second connecting chain teeth and the first connecting chain teeth are driven to staggeredly engage or disengage, so that the first chain belt and the second chain belt are attached to or detached from each other, the number of the sliders is two, and the operating axes of the two sliders are arranged in opposite directions, and when the first chain belt and the second chain belt are disengaged, the two sliders are both slidably arranged on the second chain belt. The lower stop assembly includes a first lower stop and a second lower stop that are relatively arranged, the first lower stop is attached to the connecting edge of the first extension band, the second lower stop is attached to the connecting edge of the second extension band, the second lower stop includes an insertion portion and a limiting portion that are spaced apart, a sliding channel that passes through the second lower stop along the direction of the operating axis is formed between the insertion portion and the limiting portion, and the sliding channel includes an inlet end close to the second connecting chain tooth, and the corners of the limiting portion near the inlet end are cut-angle structures.

[0005] In one embodiment, the second lower stop member also includes a connecting portion connected between the insertion portion and the limiting portion, the sliding channel is formed by the end face of the connecting portion, the side wall of the insertion portion and the side wall of the limiting portion, and the corner cutting structure is located at the corner of the limiting portion away from the connecting portion.

[0006] In one of the embodiments, the side wall of the limiting portion used to define the sliding channel is a limiting surface, and the limiting surface is a contoured surface matched with the two sliders.

[0007] In one embodiment, the side wall of the limiting portion facing away from the limiting surface is an outer wall, and the outer wall has the same shape as the limiting surface, so that the width of the limiting portion in the direction from the insertion portion to the limiting portion remains unchanged along the direction of the operating axis.

[0008] In one of the embodiments, the limiting portion further includes a trimming surface and an upper end surface arranged perpendicular to the limiting surface, and the trimming surface is connected between the upper end surface and the outer side wall.

[0009] In one embodiment, the first lower stop member includes a first upper portion and a first lower portion, and when the first lower stop member is attached to the first extension band, the first upper portion and the first lower portion are respectively located on both sides of the first extension band, and a first protrusion is protruded from the side wall of the first upper portion toward the second lower stop member, and the width of the first protrusion in the direction from the insertion portion to the limiting portion decreases from a direction close to the first connecting chain tooth to a direction away from the first connecting chain tooth.

[0010] In one embodiment, the insertion portion includes a second upper portion and a second lower portion, and when the second lower stop member is attached to the second extension band, the second upper portion and the second lower portion are respectively located on both sides of the second extension band, and the second upper portion is aligned with the first upper portion, and the second lower portion is aligned with the first lower portion, along the direction of the operating axis, the length of the first upper portion is greater than that of the second upper portion, and an end of the first upper portion close to the first connecting chain tooth is provided with an engaging groove adapted to the second connecting chain tooth.

[0011] In one embodiment, a second chamfered surface matched with the first protrusion is provided on a side surface of the second upper portion facing the first upper portion and close to an end of the second coupling element.

[0012] In one embodiment, a second protrusion is protruding from the side wall of the second lower portion toward the first lower portion, and the width of the second protrusion along the direction from the insertion portion to the limiting portion decreases from close to the second connecting chain tooth to away from the second connecting chain tooth. A first chamfered surface matching the second protrusion is provided on the side surface of the first lower portion facing the second lower portion and at one end close to the first connecting chain tooth.

[0013] In one embodiment, when the second bottom stop is attached to the second extension belt, the connecting portion is located on a side of the second extension belt where the second upper portion is provided.

[0014] The easy-insertion double-open zipper provided in the above scheme is provided with a sliding channel penetrating the second lower stop along the direction of the operating axis in the second lower stop, so as to limit the two sliders through the sliding channel, guide and limit the relative straight position and direction of the two sliders when the second lower stop is inserted into the slider, thereby improving the success rate of the first lower stop insertion and achieving the easy-insertion function. In addition, a cut-angle structure is provided at the inlet end of the limiting part to increase the width of the inlet end, so as to facilitate the slider to enter the sliding channel with a limiting function, thereby improving the smoothness of the slider being pulled in. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The structure of the easy-to-insert double-open zipper in one embodiment of the present application is shown in FIG. Figure 1 .

[0016] Figure 2 for Figure 1 Structure diagram of the middle easy-insert double-open zipper Figure 2 .

[0017] Figure 3 for Figure 1 Structure diagram of middle and lower stop assembly Figure 1 .

[0018] Figure 4 for Figure 1 Structure diagram of middle and lower stop assembly Figure 2 .

[0019] Description of reference numerals:

[0020] 100, easy-to-insert double-open zipper; 110, first tooth chain belt; 111, first extension belt; 112, first connecting chain tooth; 120, second tooth chain belt; 121, second extension belt; 122, second connecting chain tooth; 130, bottom stop assembly; 131, first bottom stop; 1311, first upper part; 1312, first lower part; 1313, first protrusion; 1314, second chamfered surface; 1315, meshing groove; 132, second bottom stop ; 1321, insertion portion; 13211, second upper portion; 13212, second lower portion; 13213, second protrusion; 13214, first chamfered surface; 1322, limiting portion; 13221, limiting surface; 13222, outer side wall; 13223, upper end surface; 13224, cutting edge surface; 1323, sliding channel; 13231, inlet end; 13232, outlet end; 1324, connecting portion; 1325, cutting angle structure. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0022] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0023] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0025] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0027] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 A structural schematic diagram of an easy-insert double-open zipper 100 in an embodiment of the present application is shown. An embodiment of the present application provides an easy-insert double-open zipper 100, and the easy-insert double-open zipper 100 includes a first toothed chain tape 110, a second toothed chain tape 120, a slider (not shown) and a bottom stop assembly 130.

[0028] like Figure 1 and Figure 2 As shown, the first fastener tape 110 includes a first extension tape 111 and a row of first coupling elements 112 attached to the coupling edge of the first extension tape 111. Figure 1 and Figure 2 As shown, the second fastener tape 120 includes a second extension tape 121 and a row of second coupling elements 122 attached to a coupling edge of the second extension tape 121 , and the second coupling elements 122 and the first coupling elements 112 are alternately arranged.

[0029] The slider is configured to be able to move back and forth along the operating axis, and during the movement, it drives the second connecting chain teeth 122 and the first connecting chain teeth 112 to engage or disengage alternately, so that the first chain belt 110 and the second chain belt 120 are attached to or detached from each other. In a double-opening zipper, there are two sliders, and the operating axes of the two sliders are set in opposite directions. In the present embodiment, when the first chain belt 110 and the second chain belt 120 are disengaged, the two sliders are slidably set on the second chain belt 120.

[0030] The lower stop assembly 130 includes a first lower stop 131 and a second lower stop 132 that are arranged opposite to each other. The first lower stop 131 is attached to the connection edge of the first extension belt 111 and is located at the tail end of the first connection link tooth 112 at the connection edge. The second lower stop 132 is attached to the connection edge of the second extension belt 121 and is located at the tail end of the second connection link tooth 122 at the connection edge. When the first and second tooth chain belts 110 and 120 are separated, the two sliders are located at the second lower stop 132. At this time, the first lower stop 131 needs to be inserted into the slider to attach the first and second tooth chain belts 110 and 120 to each other.

[0031] See also Figure 3 and Figure 4 The second lower stopper 132 includes an insertion portion 1321 and a limiting portion 1322 arranged at intervals. A sliding channel 1323 is formed between the insertion portion 1321 and the limiting portion 1322, which penetrates the second lower stopper 132 in the direction of the operating axis. The slider part is slidably arranged in the sliding channel 1323, so as to limit the two sliders through the sliding channel 1323, guide and limit the relative straight position and direction of the two sliders when the second lower stopper 132 is inserted into the slider, and improve the success rate of the insertion of the first lower stopper 131 to achieve the easy insertion function. The sliding channel 1323 includes an inlet end 13231 close to the second coupling chain tooth 122 and an outlet end 13232 away from the second coupling chain tooth 122. The slider enters the sliding channel 1323 from the inlet end 13231 and slides toward the outlet end 13232. The corners of the limiting portion 1322 near the inlet end 13231 are cut corner structures 1325 to increase the width of the inlet end 13231, making it easier for the slider to enter the sliding channel 1323 with a limiting function, thereby improving the smoothness of the slider being pulled in. It should be noted that in this specification, the length from the insertion portion 1321 to the limiting portion 1322 is referred to as the width.

[0032] like Figure 3As shown, in one embodiment, the second lower stop member 132 also includes a connecting portion 1324 connected between the insertion portion 1321 and the limiting portion 1322, the sliding channel 1323 is formed by the end face of the connecting portion 1324, the side wall of the insertion portion 1321 and the side wall of the limiting portion 1322 (the limiting surface 13221 described below), and the corner cutting structure 1325 is located at the corner of the limiting portion 1322 away from the connecting portion 1324, so as to have a guiding function on the corner of the bottom of the slider. It can be understood that the slider is slidably arranged in the sliding channel 1323. At this time, the insertion portion 1321 is located inside the slider, and the connecting portion 1324 is located in the side wall gap of the slider. Normally, in order to facilitate the sliding of the slider relative to the second lower stopper 132, the thickness of the connecting portion 1324 (perpendicular to the end face direction of the connecting portion 1324) is smaller than the side wall gap of the slider, that is, the slider can swing relative to the connecting portion 1324 in the thickness direction. At this time, by setting a cut-angle structure 1325 at the corner of the limiting portion 1322 away from the connecting portion 1324, the slider can enter the sliding channel 1323 in the direction of the operating axis and the thickness direction, thereby playing a guiding role.

[0033] like Figure 3 As shown, in one embodiment, the side wall of the limiting portion 1322 for defining the sliding channel 1323 is a limiting surface 13221, and the limiting surface 13221 is a contoured surface adapted to the two sliders. In this embodiment, the limiting surface 13221 is an arc-shaped surface convex toward the sliding channel 1323.

[0034] In one embodiment, the side wall of the limiting portion 1322 facing away from the limiting surface 13221 is the outer wall 13222, and the outer wall 13222 is consistent in shape with the limiting surface 13221. In this embodiment, the outer wall 13222 of the limiting portion 1322 is also an arc-shaped surface, so that the width of the limiting portion 1322 in the direction from the insertion portion 1321 to the limiting portion 1322 remains unchanged along the direction of the operating axis, that is, the thickness of the limiting portion 1322 is uniform, which can not only ensure the strength of the limiting portion 1322 while saving raw materials, but also improve the aesthetics of the limiting portion 1322.

[0035] like Figure 4 As shown, in one embodiment, the limiting portion 1322 also includes a cutting surface 13224 and an upper end surface 13223 arranged perpendicular to the limiting surface 13221, the cutting surface 13224 is connected between the upper end surface 13223 and the outer side wall 13222, the cutting surface 13224 is an inclined surface relative to the upper end surface 13223, and the cutting surface 13224 is an inclined surface relative to the outer side wall 13222, which can visually weaken the visual presence of the limiting portion 1322 and achieve the purpose of lightweight, while also improving the feel of the lower stop assembly 130.

[0036] like Figure 4 As shown, in one embodiment, the first lower stopper 131 includes a first upper portion 1311 and a first lower portion 1312. When the first lower stopper 131 is attached to the first extension belt 111, the first lower stopper 131 is connected to the first extension belt 111. Figure 1 and Figure 2 As shown, the first upper portion 1311 and the first lower portion 1312 are respectively located on both sides of the first extension belt 111. Figure 3 and Figure 3 As shown, in one embodiment, the inserting portion 1321 includes a second upper portion 13211 and a second lower portion 13212. When the second lower stopper 132 is attached to the second extension belt 121, the second lower stopper 1321 is connected to the second extension belt 121. Figure 1 and Figure 2 As shown, the second upper portion 13211 and the second lower portion 13212 are respectively located on both sides of the second extension belt 121, and the second upper portion 13211 is aligned with the first upper portion 1311, and the second lower portion 13212 is aligned with the first lower portion 1312. In this embodiment, the second upper portion 13211 and the first upper portion 1311 are respectively located on the outer sides of the second extension belt 121 and the first extension belt 111 (as shown in FIG. Figure 1 As shown, facing outward), the second lower portion 13212 and the first lower portion 1312 are respectively located on the back side of the second extension belt 121 and the first extension belt 111 (as shown in FIG. Figure 2 shown, facing inwards).

[0037] Combination Figure 1 and Figure 3 As shown, in one embodiment, when the second lower stopper 132 is attached to the second extension band 121, the connecting portion 1324 is located on the side of the second extension band 121 where the second upper portion 13211 is provided, so as to avoid the conventional slider being uncommon due to the small side wall gap of the conventional slider caused by the excessive thickness of the connecting portion 1324.

[0038] like Figure 1 As shown, along the direction of the operating axis, the length of the first upper portion 1311 is greater than the second upper portion 13211, and an end of the first upper portion 1311 close to the first coupling tooth 112 is provided with an engagement groove 1315 adapted to the second coupling tooth 122, Figure 1 As shown, the engagement groove 1315 is used to engage with one of the second coupling elements 122 that is close to the second lower stopper 132 .

[0039] like Figure 4 As shown, in one embodiment, the first upper portion 1311 is provided with a first protrusion 1313 on the side wall facing the second lower stopper 132, and the width of the first protrusion 1313 along the direction from the insertion portion 1321 to the limiting portion 1322 decreases from the direction close to the first coupling tooth 112 to the direction away from the first coupling tooth 112. Figure 3As shown, the second upper portion 13211 is provided with a second chamfered surface 1314 matched with the first protrusion 1313 on the side of the first upper portion 1311 and near one end of the second connecting chain element 122 to achieve the engagement of the first lower stopper 131 and the second lower stopper and the lower stop of the pulling head.

[0040] like Figure 3 and Figure 4 As shown, in one embodiment, the second lower portion 13212 is provided with a second protrusion 13213 on the side wall facing the first lower portion 1312, and the width of the second protrusion 13213 in the direction from the insertion portion 1321 to the limiting portion 1322 decreases from the direction close to the second coupling tooth 122 to the direction away from the second coupling tooth 122, as shown in FIG. Figure 4 As shown, a first chamfered surface 13214 matching with the second protrusion 13213 is provided on the side of the first lower portion 1312 facing the second lower portion 13212 and near one end of the first connecting chain element 112 to achieve the engagement of the first lower stop 131 and the second lower stop and the lower stop of the pulling head.

[0041] The easy-insertion double-open zipper 100 provided in the above scheme is provided with a sliding channel 1323 penetrating the second lower stopper 132 along the direction of the operating axis, so as to limit the two sliders through the sliding channel 1323, guide and limit the relative straight position and direction of the two sliders when the second lower stopper 132 is inserted into the slider, and improve the success rate of the insertion of the first lower stopper 131 to achieve the easy insertion function. In addition, a cut-angle structure 1325 is provided at the inlet end 13231 of the limiting part 1322 to increase the width of the inlet end 13231, so as to facilitate the slider to enter the sliding channel 1323 with a limiting function, and improve the smoothness of the slider to be pulled in.

[0042] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An easy-insert double-open zipper (100), characterized in that: The easy-insert double-open zipper (100) comprises: A first fastener belt (110) comprising a first extension belt (111) and a row of first coupling fastener elements (112) attached to a coupling edge of the first extension belt (111); A second fastener belt (120), comprising a second extension belt (121) and a row of second coupling teeth (122) attached to a coupling edge of the second extension belt (121), wherein the second coupling teeth (122) and the first coupling teeth (112) are arranged alternately; A pull head is configured to be able to reciprocate along an operating axis, and during the movement, drives the second connecting chain teeth (122) and the first connecting chain teeth (112) to interlace or disengage, so that the first chain belt (110) and the second chain belt (120) are attached to or detached from each other, the number of the pull heads is two, and the operating axes of the two pull heads are arranged in opposite directions, and when the first chain belt (110) and the second chain belt (120) are disengaged, the two pull heads are slidably arranged on the second chain belt (120); A lower stop assembly (130) comprises a first lower stop member (131) and a second lower stop member (132) which are arranged opposite to each other, wherein the first lower stop member (131) is attached to the connecting edge of the first extension belt (111), and the second lower stop member (132) is attached to the connecting edge of the second extension belt (121), and the second lower stop member (132) comprises an insertion portion (1321) and a limiting portion (1322) which are arranged at intervals, and a sliding channel (1323) which passes through the second lower stop member (132) along the direction of the operating axis is formed between the insertion portion (1321) and the limiting portion (1322), and the sliding channel (1323) comprises an inlet end (13231) close to the second connecting chain tooth (122), and the corner of the limiting portion (1322) close to the inlet end (13231) is a cut-angle structure (1325).

2. The easy-insert double-opening zipper (100) according to claim 1, characterized in that: The second lower stopper (132) also includes a connecting portion (1324) connected between the insertion portion (1321) and the limiting portion (1322), the sliding channel (1323) is formed by the end face of the connecting portion (1324), the side wall of the insertion portion (1321) and the side wall of the limiting portion (1322), and the cut-angle structure is located at the corner of the limiting portion (1322) away from the connecting portion (1324).

3. The easy-insert double-opening zipper (100) according to claim 1 or 2, characterized in that: The side wall of the limiting portion (1322) used for defining the sliding channel (1323) is a limiting surface (13221), and the limiting surface (13221) is a contoured surface adapted to the two sliders.

4. The easy-insert double-opening zipper (100) according to claim 3, characterized in that: The side wall of the limiting portion (1322) that faces away from the limiting surface (13221) is an outer wall (13222), and the outer wall (13222) is consistent in shape with the limiting surface (13221) so that the width of the limiting portion (1322) in the direction from the insertion portion (1321) to the limiting portion (1322) remains unchanged along the direction of the operating axis.

5. The easy-insert double-opening zipper (100) according to claim 4, characterized in that: The limiting portion (1322) further comprises a cutting surface (13224) and an upper end surface (13223) arranged perpendicular to the limiting surface (13221), and the cutting surface (13224) is connected between the upper end surface (13223) and the outer side wall (13222).

6. The easy-insert double-opening zipper (100) according to claim 2, characterized in that: The first lower stop member (131) includes a first upper portion (1311) and a first lower portion (1312). When the first lower stop member (131) is attached to the first extension band (111), the first upper portion (1311) and the first lower portion (1312) are respectively located on both sides of the first extension band (111), and a first protrusion (1313) is protruded from the side wall of the first upper portion (1311) toward the second lower stop member (132). The width of the first protrusion (1313) in the direction from the insertion portion (1321) to the limiting portion (1322) decreases from the direction close to the first connecting chain tooth (112) to the direction away from the first connecting chain tooth (112).

7. The easy-insert double-opening zipper (100) according to claim 6, characterized in that: The insertion portion (1321) includes a second upper portion (13211) and a second lower portion (13212). When the second lower stop member (132) is attached to the second extension belt (121), the second upper portion (13211) and the second lower portion (13212) are respectively located on both sides of the second extension belt (121), and the second upper portion (13211) is aligned with the first upper portion (1311), and the second lower portion (13212) is aligned with the first lower portion (1312). Along the direction of the operating axis, the length of the first upper portion (1311) is greater than that of the second upper portion (13211), and an engaging groove (1315) adapted to the second connecting chain tooth (122) is provided at one end of the first upper portion (1311) close to the first connecting chain tooth (112).

8. The easy-insert double-opening zipper (100) according to claim 7, characterized in that: A second chamfered surface (1314) adapted to the first protrusion (1313) is provided on the side of the second upper portion (13211) facing the first upper portion (1311) and at one end close to the second connecting chain element (122).

9. The easy-insert double-opening zipper (100) according to claim 7, characterized in that: A second protrusion (13213) is protruding from the side wall of the second lower portion (13212) toward the first lower portion (1312), and the width of the second protrusion (13213) in the direction from the insertion portion (1321) to the limiting portion (1322) decreases from close to the second connecting chain tooth (122) to away from the second connecting chain tooth (122). A first chamfered surface (13214) that is compatible with the second protrusion (13213) is provided on the side of the first lower portion (1312) facing the second lower portion (13212) and at one end close to the first connecting chain tooth (112).

10. The easy-insert double-opening zipper (100) according to claim 7, characterized in that: When the second lower stopper (132) is attached to the second extension belt (121), the connecting portion (1324) is located on a side of the second extension belt (121) where the second upper portion (13211) is provided.

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