Plastic steel double-opening zipper

Abstract

The utility model discloses a plastic steel double-opening zipper which comprises a lower puller, an upper puller, a first zipper belt and a second zipper belt, the first zipper belt comprises a first zipper tooth row and a socket which are sequentially arranged on the same straight line, and the second zipper belt comprises a second zipper tooth row and a bolt which are sequentially arranged on the same straight line; the lower puller and the upper puller are arranged on the first zipper belt in a sliding mode, the lower puller is located between the upper puller and the socket, the upper side face and the lower side face are each provided with a clamping table and a limiting protruding part, the clamping tables are arranged on the outer side edge of the tail of the plug pin, the limiting protruding parts are arranged in front of the clamping tables, and parts of the limiting protruding parts extend out of extension lines of the inner sides of the clamping tables. The maximum thickness h of the limiting protruding part is larger than the height of the inner cavity of the lower pull head, the limiting protruding part partially extends out of an extension line of the inner side of the clamping table, and the lower pull head has the advantage of being more convenient to use.

Description

Technical Field

[0001] This utility model relates to zipper technology, and in particular to a plastic-steel double-opening zipper. Background Technology

[0002] Double-opening zippers are a common type of zipper. They have two independent zipper pulls, one at the top and one at the bottom. Each zipper pull can be operated independently. Users need to align the two zipper pulls to open or close the zipper smoothly. However, in actual operation, the bottom zipper pull is prone to shifting. Users need to hold the bottom zipper pull in place with one hand to insert the pin into the two zipper pulls, which is very inconvenient to use. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a convenient double-opening zipper.

[0004] To achieve the above objectives, the solution of this utility model is:

[0005] A double-opening plastic steel zipper includes a lower pull head, an upper pull head, a first chain belt, and a second chain belt. The first chain belt includes a first row of chain teeth and a socket arranged sequentially on a straight line. The second chain belt includes a second row of chain teeth and a pin arranged sequentially on a straight line. The lower pull head and the upper pull head are slidably disposed on the first chain belt, with the lower pull head located between the upper pull head and the socket. The direction perpendicular to the plane containing the first and second chain belts is defined as the vertical direction. The two sides of the socket in the vertical direction are the upper side and the lower side, respectively. The side where the socket and the pin face each other is defined as the inner side. A locking platform and a limiting protrusion are provided on both the upper and lower sides. The locking platform is located at the outer edge of the pin's tail. The limiting protrusion is located in front of the locking platform, with a portion extending outwards from the inner extension line of the locking platform. The maximum thickness h of the limiting protrusion is higher than the height of the lower pull head's inner cavity.

[0006] Furthermore, the limiting protrusion has a columnar structure.

[0007] Furthermore, the limiting protrusion is tapered from the bottom to the end.

[0008] Furthermore, the limiting protrusion is an upright block column.

[0009] Furthermore, the limiting protrusion is frustum-shaped.

[0010] Furthermore, the limiting protrusion is frustum-shaped.

[0011] Furthermore, the limiting protrusion is disposed adjacent to the card platform.

[0012] Furthermore, the limiting protrusion is spaced apart from the card platform.

[0013] Furthermore, the distance d between the center of the limiting protrusion and the front edge of the card table is less than 2mm.

[0014] Furthermore, the maximum thickness h of the limiting protrusion is 1-3 mm higher than the height of the inner cavity of the pull-down head.

[0015] With the above structure, the plastic steel double-opening zipper proposed by this utility model has the following technical effects: the limiting protrusion, which is higher than the inner cavity of the lower pull head, can fix the lower pull head, making it easier to align the upper and lower pull heads. In addition, part of the limiting protrusion extends out of the inner edge of the card table, making the limiting protrusion closer to the support core of the lower pull head, thus achieving a better limiting effect and making it more convenient to use. Attached Figure Description

[0016] Figure 1 This is a partial perspective structural diagram of one embodiment of the plastic-steel double-opening zipper of this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of a socket according to one embodiment of the present invention, which is a plastic steel double-opening zipper.

[0018] Figure 3 This is a schematic diagram of the main structure of a socket according to one embodiment of the present invention, which is a plastic steel double-opening zipper.

[0019] Figure 4 This is a left-side structural schematic diagram of a socket according to Embodiment 1 of the present invention, which is a plastic steel double-opening zipper.

[0020] Figure 5 This is a schematic diagram of the main structure of a socket according to Embodiment 2 of the present invention, which is a plastic steel double-opening zipper.

[0021] Figure 6 This is a three-dimensional structural diagram of a socket according to Embodiment 3 of the present invention, which is a plastic steel double-opening zipper.

[0022] In the diagram: 1. Pull-up head, 2. Pull-down head, 3. First chain teeth, 4. Socket, 5. Second chain teeth, 6. Pin, 7. Support core, 8. Card plate, 9. Limiting protrusion. Detailed Implementation

[0023] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0024] Implementation Method 1:

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4The illustrated plastic steel double-opening zipper includes an upper pull head 1, a lower pull head 2, a first zipper belt, and a second zipper belt. The first zipper belt includes a first chain tooth row 3 and a socket 4 arranged sequentially on the same straight line. The first zipper belt also includes a first fabric strip (not shown in the figure). The first chain tooth row 3 and the socket 4 are located on one side edge of the first fabric strip. The first fabric strip, the first chain tooth row 3, and the socket 4 are located on the same plane. The second zipper belt includes a second chain tooth row 5 and a pin 6 arranged sequentially on the same straight line. The second zipper belt also includes a second fabric strip (not shown in the figure). The second chain tooth row 5 and the pin 6 are located on one side edge of the second fabric strip. The second fabric strip, the second chain tooth row 5, and the pin 6 are located on the same plane. The upper pull head 1 and the lower pull head 2 slide on the first zipper belt. Both the first and second fabric strips are conventional plastic steel zipper fabric strips, the first chain tooth row 3 and the second chain tooth row 5 are conventional plastic steel chain teeth, and the upper pull head 1 and the lower pull head 2 are conventional zipper heads. Further details are omitted here.

[0026] The pull-down head 2 and the pull-up head 1 are slidably disposed on the first chain belt; the pull-down head 2 is located between the pull-up head 1 and the socket 4, and both the pull-up head 1 and the pull-down head 2 are provided with a support core 7. The support cores of the pull-up head 1 and the pull-down head 2 are arranged opposite to each other. Both the pull-up head 1 and the pull-down head 2 have an opening and an inner cavity. The opening is located on both sides of the support core, and the inner cavity is used to accommodate the first chain belt and the second chain belt.

[0027] Let the direction perpendicular to the plane where the first chain and the second chain are located be the vertical direction. The two sides of the socket 4 located in the vertical direction are the upper side and the lower side, respectively. The side where the socket 4 and the pin 6 face each other is the inner side. Both the upper side and the lower side are provided with a locking platform 8 and a limiting protrusion 9. Let the end where the pin 6 and the socket 4 are located be the rear, and the direction in which the first chain tooth row 3 and the second chain tooth row 5 extend is the front.

[0028] The locking plate 8 is located on the outer edge of the tail of the pin 6. The locking plate 8 is square in shape and is used to cooperate with the opening of the upper pull head 1 to prevent the lower pull head 2 from coming out of the socket 4.

[0029] The limiting protrusion 9 is located in front of the card table 8, and the height of the limiting protrusion 9 is lower than the height of the card table 8.

[0030] Furthermore, the limiting protrusion 9 can be arranged adjacent to or spaced apart from the card platform 8, that is, the limiting protrusion 9 can be connected to the card platform 8 or arranged independently of it. The distance d between the center position of the limiting protrusion 9 and the front edge of the card platform 8 is less than 2mm. The aforementioned center position is the centerline position of the limiting protrusion 9 in the front-rear direction. The limiting protrusion 9 is a columnar structure. As several optional solutions, the limiting protrusion 9 can be a straight column or a frustum-shaped column that tapers from the bottom to the end. In this embodiment, the limiting protrusion 9 adopts the latter solution. Preferably, the aforementioned frustum-shaped column is a truncated cone-shaped column that is narrow at the top and wide at the bottom.

[0031] The maximum thickness h of the limiting protrusion 9 is higher than the height of the inner cavity of the pull-down head 2. Furthermore, the maximum thickness h of the limiting protrusion 9 is 1-3mm higher than the height of the inner cavity of the pull-down head 2.

[0032] This utility model has the following advantages:

[0033] When the pull-down head 2 is engaged with the socket 4 and the opening of the pull-down head 2 is fitted onto the card holder 8, the upper and lower surfaces of the limiting protrusion 9 abut against the inner cavity of the pull-down head. Since the maximum thickness of the limiting protrusion 9 is higher than the height of the inner cavity of the pull-down head 2, the limiting protrusion 9 and the inner cavity of the pull-down head 2 are interference-fitted to fix the pull-down head 2 onto the socket 4.

[0034] Since the center of the limiting protrusion 9 is less than 2mm away from the front edge of the card table 8 and part of the limiting protrusion 9 extends out, when the pull-down head 2 moves to the limit position of the socket 4, the limiting protrusion 9 is just engaged with the inner cavity near the support core. According to the lever principle, the deformation generated in the area closer to the fulcrum is smaller. Therefore, the limiting protrusion 9 set at this position can fix the pull-down head 2 with a smaller thickness.

[0035] Implementation Method Two:

[0036] like Figure 5 As shown, the difference between this embodiment and the first embodiment is that the limiting protrusion 9 is a frustum-shaped structure.

[0037] Implementation Method 3:

[0038] like Figure 6 As shown, the difference between this embodiment and the first embodiment is that the limiting protrusion 9 is an upright block column and the limiting protrusion 9 is arranged adjacent to the card platform 8. This structure is easy to mold and manufacture.

[0039] It should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing these embodiments and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0040] The above embodiments and accompanying drawings are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A plastic-steel double-opening zipper, characterized in that: The device includes a pull-down head, a pull-up head, a first chain, and a second chain. The first chain includes a first set of chain teeth and a socket arranged sequentially on a straight line. The second chain includes a second set of chain teeth and a pin arranged sequentially on a straight line. The pull-down head and the pull-up head are slidably disposed on the first chain, with the pull-down head located between the pull-up head and the socket. The direction perpendicular to the plane containing the first and second chain is defined as the vertical direction. The two sides of the socket in the vertical direction are the upper side and the lower side, respectively. The side where the socket and the pin face each other is defined as the inner side. A locking platform and a limiting protrusion are provided on both the upper and lower sides. The locking platform is located at the outer edge of the pin's tail, and the limiting protrusion is located in front of the locking platform. A portion of the limiting protrusion extends outward from the inner extension line of the locking platform. The maximum thickness h of the limiting protrusion is higher than the height of the inner cavity of the pull-down head.

2. The plastic-steel double-opening zipper as described in claim 1, characterized in that: The limiting protrusion is a columnar structure.

3. A double-opening plastic steel zipper as described in claim 2, characterized in that: The limiting protrusion is gradually tapered from the bottom to the end.

4. A double-opening plastic steel zipper as described in claim 2, characterized in that: The limiting protrusion is an upright block column.

5. A double-opening plastic steel zipper as described in claim 3, characterized in that: The limiting protrusion is frustum-shaped.

6. A double-opening plastic steel zipper as described in claim 3, characterized in that: The limiting protrusion is frustum-shaped.

7. A double-opening plastic steel zipper as described in claim 1, characterized in that: The limiting protrusion is disposed adjacent to the card platform.

8. A double-opening plastic steel zipper as described in claim 1, characterized in that: The limiting protrusion is spaced apart from the card platform.

9. A double-opening plastic steel zipper as described in claim 1, characterized in that: The distance d between the center of the limiting protrusion and the front edge of the card table is less than 2mm.

10. A double-opening plastic steel zipper as described in claim 1, characterized in that: The maximum thickness h of the limiting protrusion is 1-3 mm higher than the height of the inner cavity of the pull-down head.

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