Hairpin and method for manufacturing the same

Abstract

The present application discloses a hair fixing device in the form of a hairpin and a manufacturing method thereof. The hair fixing device includes a first claw member, a second claw member, and an extension body. Both the first claw member and the second claw member have a front portion, a rear portion, and a connecting portion disposed between the front portion and the rear portion. The rear portions of the first claw member and the second claw member serve as a pair of handles for controlling the opening or closing of the hair fixing device. In one embodiment, the front portion region of the extension body includes a plurality of tension cords, and a gap is provided between the tension cords and the rear portion region, so that the tension cords and the rear portion region can be operated independently of each other.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Australian Patent Application No. 2018271255, filed on November 26, 2018, the entire content of which is incorporated herein by reference. Technical field

[0003] This application relates to a hair fixing device in the form of a hair claw and a method for manufacturing the same, the hair fixing device having enhanced hair fixing performance. Background art

[0004] To meet the different needs of users in managing their hair, a variety of hair accessories have been developed. For example, there are hair fixing devices in the form of hair clips, which are usually used to fix a layer of hair. Another special type of hair fixing device is in the form of a hair claw. However, one drawback of some hair claws (or actually some other hair fixing devices) on the market is that the hair fixed thereby is often caught by their different moving parts, thus damaging the hair and causing pain to the user. Other drawbacks of some hair fixing devices are that they are difficult to manufacture and / or not durable enough, and thus tend to lose their ability to clamp and fix hair after short - term repeated use, and may even fall apart. Another drawback is that some traditional hair fixing devices are difficult to operate. For example, some hair claws on the market may be difficult to open and thus inoperable, and require the user to apply a great deal of pressure to the handle controlling the opening or closing during use.

[0005] This application attempts to solve the above problems or at least provide an alternative to the public. Summary of the invention

[0006] According to a first aspect of the present application, there is provided a hair fixing device in the form of a hair claw, comprising a first claw member, a second claw member and an elongate block, wherein:

[0007] Both the first claw member and the second claw member have a front portion, a rear portion and a connecting portion disposed between the front portion and the rear portion, and the rear portions of the first claw member and the second claw member serve as a pair of handles for controlling the opening or closing of the hair fixing device.

[0008] The elongate block is disposed between the first claw member and the second claw member at the connecting portion to serve as a hinge, and the first claw member and the second claw member are capable of reciprocally rotating relative to each other at the hinge.

[0009] The elongate block is substantially made of a polymer material and has a front region and a rear region connected through the remaining region of the elongate block.

[0010] The front region includes a plurality of tension cords, and a gap is provided between the tension cords and the rear region, such that the tension cords and the rear region can operate independently of each other, and

[0011] The extension body has a first state and a second state. In the first state, when the handles move towards each other, the rear region is compressed and the tension cords are stretched; in the second state, when the handles are released, the tension cords pull the first claw member and the second claw member towards each other, thereby returning the hair fixing device to a closed or initial state.

[0012] Preferably, each connecting portion of the claw member may be provided with an opening defined by an edge, and the extension body may be formed with an upper circumferential groove and a lower circumferential groove at its opposite ends or at its upper and lower ends. Through the engagement of the grooves with the edge, the extension body can be fixedly connected to the first claw member and the second claw member.

[0013] In one embodiment, the opposite ends of the extension body may protrude through the connecting portions.

[0014] In one embodiment, the extension body may include a central member, a top member, and a bottom member, wherein the top member and the central member together define the upper circumferential groove, and the bottom member and the central member together define the lower circumferential groove, wherein the top member and the bottom member are fixedly connected to the central member, thereby clamping the first claw member and the second claw member at the central member and fixing them together.

[0015] Advantageously, the opening of the connecting portion may be substantially oval, wherein the size and shape of the groove are designed to be complementary to the edge, and the extension body is substantially designed in the form of an oval connecting member. The extension body may generally be in the form of an oval connecting member or in a form similar to an oval connecting member, and the oval connecting member serves as a hinge for the first claw member and the second claw member.

[0016] Preferably, the first claw member and the second claw member may be made of a material selected from the group consisting of ABS, PP, HIPS, GPPS, PE, nylon, polycarbonate, K-resin, acetal, cellulose acetate, PVC, PET, and PLA, and the extension body may include silicone resin or be substantially made of silicone resin. With these material properties, the possibility of the hair to be tied being clamped by the movement of the hair fixing device or the metal parts can be minimized as much as possible, even if it cannot be completely avoided.

[0017] Suitably, the hair fixing device may include four tension cords evenly spaced on the front region of the extension body.

[0018] In a preferred embodiment, the hair fixing device has no metal parts, or at least the hinge has no metal parts.

[0019] According to a second aspect of the present application, there is provided a hair fixing device in the form of a hairpin, the hair fixing device comprising a first claw member, a second claw member and an extension body, wherein:

[0020] Both the first claw member and the second claw member have a front portion, a rear portion and a connecting portion disposed between the front portion and the rear portion, and the rear portions of the first claw member and the second claw member serve as a pair of handles for controlling the opening or closing of the hair fixing device.

[0021] The extension body includes a top member, a central member and a bottom member, the central member is disposed between the first claw member and the second claw member at the connecting portion to serve as a hinge, and the first claw member and the second claw member can reciprocally rotate relative to each other at the hinge.

[0022] The top member and the bottom member are fixedly connected to the central member through the first claw member and the second claw member, thereby sandwiching and fixing the first claw member and the second claw member together at the central member.

[0023] The extension body is substantially made of a polymer material, and

[0024] The extension body has a first state and a second state. In the first state, when the handles move towards each other, the rear region of the central member is compressed and the front region of the central member is stretched. In the second state, when the handles are released, the front region of the central member pulls the claw members towards each other, thereby returning the hair fixing device to the closed or initial state.

[0025] This solution of the extension body protruding through the opening is important in at least two aspects. First, the contact area between the extension body and the claw members is not limited to the surface of the extension body and the inward surface of the claw members. Instead, the contact (and connection) area is distributed along the edges and the length or area of the grooves of the extension body. This is important because it can minimize excessive pulling force and reduce the difficulty of separating the handles during use. However, in terms of durability, the connection between the extension body and the claw members at the edges and grooves is strengthened. Second, by using the protruding structure, the extension body can have an increased volume to withstand the reciprocating pressure and stretching caused by the repeated operation of closing or opening the claw members.

[0026] According to a third aspect of the present application, there is provided a method for manufacturing a hair fixing device, the hair fixing device being the above-mentioned hair fixing device, and the manufacturing method includes the step of connecting the extension body or the top member, the bottom member and the central member to the first claw member and the second claw member by heat sealing or by an adhesive.

[0027] According to a fourth aspect of the present application, there is provided a method of manufacturing a hair fixing device, the manufacturing method comprising the following steps:

[0028] Forming a first claw member and a second claw member,

[0029] Forming a hinge of an extension body made substantially of a polymer material only by injection molding, the extension body including a front region and a rear region connected together by other parts of the extension body, the front region being in the form of a plurality of tension cords, and there being a gap between the tension cords and the rear region of the extension body, and

[0030] Placing the extension body between a pair of claw members at a connection portion and fixedly connecting the extension body to the hair fixing device at the connection portion.

[0031] Preferably, the method may include the following steps: forming an opening at each connection portion of the first claw member and the second claw member; forming a pair of grooves at opposite ends or upper and lower ends of the extension body; and fixedly connecting the extension body to the first claw member and the second claw member by engaging the edges through the grooves.

[0032] Suitably, the method may include the step of connecting the extension body to the first claw member and the second claw member such that opposite ends of the extension body both protrude through the openings at the connection portion.

[0033] In one embodiment, the extension body may include a top member, a central member, and a bottom member, wherein the top member and the bottom member sandwich the claw members at the connection portion and are connected to the central member, thereby fixing the extension body to the hair fixing device.

[0034] In a preferred embodiment, the hair fixing device has no metal parts or at least its hinge has no metal parts.

[0035] Suitably, the connection portion may be provided with an opening, and the extension body engages at the opening. In a preferred embodiment, the extension body may be in the form of an oval connecting member.

[0036] The first claw member and the second claw member may be made of a material selected from the group consisting of ABS, PP, HIPS, GPPS, PE, nylon, polycarbonate, K-resin, acetal, cellulose acetate, PVC, PET, and PLA, and the extension body may include silicone resin or be made substantially of silicone resin.

[0037] In a preferred embodiment, four tension cords may be evenly spaced at the front portion of the extension body. Description of the Drawings

[0038] Reference is now made to the accompanying drawings to describe some embodiments of the present application, in which:

[0039] Figure 1 and Figure 2 are two different perspective views showing a first embodiment of a hair fixing device according to the present application;

[0040] Figure 3 and Figure 4 are Figure 1 the top view and the bottom view of the hair fixing device of

[0041] Figure 5 and Figure 6 are Figure 1 the side views of both sides of the hair fixing device of

[0042] Figure 7 and Figure 8 are Figure 1 the front view and the rear view of the hair fixing device of

[0043] Figure 9 and Figure 10 are Figure 1 two different perspective views of the hair fixing device of

[0044] Figure 11 is Figure 1 the exploded view of the hair fixing device of

[0045] Figure 12 is showing Figure 1 the schematic diagram of the internal structure of the connecting member of the hair fixing device of

[0046] Figures 13 to 17 are different views showing different connecting members for a second embodiment of the hair fixing device according to the present application;

[0047] Figure 18 is a schematic diagram showing a second embodiment of the connecting member incorporating Figures 13 - 17 wherein the hair fixing device is in a closed state;

[0048] Figure 19 is showing Figure 18 the hair fixing device of Figure 18 but in a state between the closed state of Figure 20 and the open state of

[0049] Figure 20 is showing Figure 18 the hair fixing device of

[0050] Figure 21 is an exploded view of a third embodiment of the hair fixing device according to the present application;

[0051] Figure 22 is Figure 21 a perspective view of the hair fixing device in a closed or initial state;

[0052] Figure 23 is Figure 21 a side view of the hair fixing device; and

[0053] Figure 24 or Figure 21 a side view of the hair fixing device in an open or deployed state. Detailed Embodiments

[0054] The present application relates to a hair fixing device and will be described and explained by the following examples.

[0055] Figures 1 to 11 shows a first embodiment of the hair fixing device according to the present application, generally designated by 2. For example, as Figure 1 shown, the hair fixing device 2 has an upper claw member 4, a lower claw member 6, and a connecting member 8. (It should be noted that in this specification, references to "upper" and "lower", "rear" and "front", "upward" and "downward", "right" and "left", etc. refer to the relative positions in the hair fixing device and do not limit the meaning that the hair fixing device must be set in a specific position.) Figure 1 and Figure 2 show the hair fixing device 2 in a closed or initial state.

[0056] The upper claw member 4 or the first claw member has a rear portion 10a, a connecting portion (or middle portion) 10b, and a front portion 10c. The lower claw member 6 or the second claw member similarly has a rear portion 12a, a connecting portion (or middle portion) 12b, and a front portion 12c. The upper claw member 4 and the lower claw member 6 are connected together at the connecting portions 10b, 12b by the connecting member 8. In this embodiment, each claw member 4, 6 has three finger-like members 14 extending forward from its rear portion. As Figure 1 and Figure 2 shown, in the initial state, the claw members 4, 6 are relatively closed to each other, and the finger-like members 14 are complementarily arranged and in a state of being mutually fastened.

[0057] As Figures 1 to 6 shown, the connecting member 8 has an elongated or oval profile and extends transversely across the connecting portions of the claw members 4, 6 as indicated by the arrows A <------> A in Figure 3 .

[0058] As Figure 1 , 2, as shown in Figures 5, 6, and 11, the connecting portions 10b, 12b of the claws 4, 6 have elongated oval openings 16a, 16b, which are defined by a pair of edges 18a, 18b formed on the claws 4, 6. As shown, the connecting member 8 in the form of an extension body is provided with circumferential grooves 20a, 20b on both of its sides (the upper side and the lower side). The sizes and shapes of the edges 18a, 18b of the claws 4, 6 and the grooves 20a, 20b of the extension body 8 are set such that the grooves 20a, 20b are respectively complementarily fitted into the edges 18a, 18b. Oppositely arranged portions of the extension body 8 project from the claws 4, 6 through the openings 16a, 16b at the connecting portions 10b, 12b. In other words, the extension body can be substantially seen from all six orthogonal views of the hair fixing device 2. In particular, when the hair fixing device 2 is viewed from above or below, the protruding portions of the connecting member 8 are visible. For example, see Figures 1 - 6 and Figure 10 .

[0059] The upper claw 4 and the lower claw 6 (or the left claw and the right claw, depending on the orientation of the hairpin) are preferably made of a material selected from the group including ABS, PP, HIPS, GPPS, PE, nylon, polycarbonate, K-resin, acetal, cellulose acetate, PVC, PET, and PLA. The extension body 8 may include silicone or be substantially made of silicone. This combination of these candidate materials can provide a balance of physical properties such as the required contact comfort, structural durability, and visual aesthetic. Since the hair fixing device 2 is substantially made of a polymer material and does not contain any metal parts, the possibility that the hair to be tied is moved or clamped by metal parts such as metal hinges or spring hinges is reduced as much as possible, if not completely avoided.

[0060] In this embodiment, the elongated connecting member 8 defines a rear surface 24 facing the rear portions 10a, 12a and a front surface 26 facing the front portions 10c, 12c, wherein the extension body 8 is visibly provided with a plurality of cutout regions 28 at or at least visible from the front surface 26, whereby the extension body 8 resembles a gill structure at the front surface 26. The gill structure weakens the (density) at the front surface of the extension body 8, thereby allowing the extension body 8 to be used as a hinge mechanism. The weakened extension body 8 provides a difference in strength and density in the extension body 8, making it easier for the claws 4, 6 to separate during the movement of the handle. At the same time, the elasticity of the extension body 8 is still sufficient to allow the claws 4, 6 to move together automatically and close, thereby fixing the hair between the claws. Figures 9 - 11The gill structure of the connecting member 8 is shown in a more detailed manner. In particular, a plurality of tunnel-like structures are arranged and defined in the connecting member 8. The tunnel-like structure is defined by a pair of relatively parallel walls and is located between these walls. In the closed or initial state, the walls are in a relaxed state. See, for example Figures 1 - 2 , Figures 5 - 6 and Figures 11 - 12 , especially Figure 11 . In the open or expanded state, the walls are in a stretched state. See, for example Figures 9 - 10 .

[0061] The hair fixing device 2 as described above can be manufactured in the following manner: The first claw member 4 and the second claw member 6 are manufactured by a first injection molding, and then the connecting member 8 is separately manufactured by a one-step second injection molding. After the claw members 4, 6 and the connecting member 8 are made, they can be assembled by placing the connecting member 8 at the connecting portions 10b, 12b between a pair of mating claw members 4, 6, where the grooves 20a, 20b are fixed at the complementary edges 18a, 18b. Then, the connecting member 8 will be fixedly connected to the edges 18a, 18b by heat sealing or by an adhesive. Alternatively, a pair of claw members 4, 6 can be placed in a mold, and the connecting member 8 can be formed in the mold, thereby simultaneously forming the connecting member 8 and connecting the connecting member 8 to the claw members 4, 6 in one step. Since the number of manufacturing steps is reduced and no metal parts are used, this manufacturing method can significantly reduce costs.

[0062] For example, Figure 5 and Figure 6 show the hair fixing device 2 in the closed or initial state. Therefore, the connecting member 8 is in an uncompressed or initial state. Figure 9 and Figure 10 show the hair fixing device 2 in the open or expanded state. In use, the hair fixing device 2 is opened by pressing down or bringing closer the handles or the rear parts 10a, 12a. When the rear parts 10a, 12a approach each other, the rear region of the connecting member 8 is compressed and squeezed, while the front region of the connecting member 8 is stretched. Due to the gill structure of the connecting member 8, the front part of the connecting member is weakened, thereby allowing it to be more easily stretched during the opening of the claw members 10c, 12c. When the handles are no longer pressed together, the elasticity of the connecting member 8 pulls the claw members back together, thereby returning the hair fixing device 2 to the initial state, thus fixing the hair located between the claw members.

[0063] In Figures 13 - 20 a second embodiment of the hair fixing device 102 according to the present application is shown. For the features common to the first embodiment and the second embodiment, they will not be discussed for the sake of brevity. Below, the differences between the first embodiment and the second embodiment will be focused on.

[0064] Similar to the hair fixture 2, the hair fixture 102 also has a connector 108. Figures 13 - 16 The connecting member 108 is similarly provided with a rear region 124 having a rear surface facing away from the hair securing device 102 and a front region 126 having a front facing portion. However, the front region 126 differs in that a tensioning cable 128 is provided instead of a cut-out region. Figure 13 , Figure 14 and Figure 16 A front view, a side view, and a perspective view of the connecting member 108 are shown, respectively, showing the outline of the tensioning cable 128. The tensioning cable 128 extends from opposite ends of the connecting member 108. A gap is provided between the tensioning cable 128 and the rear region 124.

[0065] Figure 18 A perspective view, a side view and a schematic diagram of a hair securing device 102 incorporating a connecting member 108 in an initial or closed state are shown. In this state, the connecting member 108 is not under pressure or strain, and the jaws are closed and arranged complementary to each other through their fingers. In this initial state, the tensioning cable 128 holds the hair jaws close to each other. It is contemplated that in this initial state, a strand of hair can be secured between the hair jaws during use.

[0066] Figure 20 The perspective, side and schematic views of the hair fixture 102 are similarly shown, but the hair fixture 102 is in a fully open or deployed state. In this state, the handles of the hair fixture 102 are depressed and brought close to each other, thereby separating the hair claw members. It can be seen and understood that the tensioning cable 128 is stretched and extended. In this open state, the tensioning cable 128 is in a tensioned state. It is contemplated that in such an open state, the claw members can be placed around or removed from the hair bundle during use.

[0067] Figure 19 The perspective, side and schematic views of the hair fixture 102 are similarly shown, but the hair fixture 102 is in a state between the closed state and the open state. In this state, the tensioning cable 128 is half-stretched, and the hair claw members are still under tension from the tensioning cable and biased toward each other.

[0068] In this embodiment, four such tension cables 128 are finally provided on the front portion of the connecting member. The use of such tension cables is advantageous in many respects. For example, the biasing force of the tension cable can be adjusted by changing the number or thickness of the tension cables, thus having greater design freedom. For example, a series of hair claws with different closing strengths can be provided. In addition, since the tension cables are different and separated from the rear region of the connecting member, the tension cables can be operated independently, and thus the closing or opening of the hair claw member can be achieved more effectively.

[0069] In Figures 21 - 24 a third embodiment of the hair fixing device 202 according to the present application is shown. For the features common to the second and third embodiments, they will not be discussed for the sake of brevity. Below, the differences between the second and third embodiments will be focused on.

[0070] The hair fixing device 202 similarly has a connecting member 208. However, different from the one-piece structure or the one-step injection molding method, the connecting member 208 is made of a three-piece structure. Specifically, the connecting member includes a top member 208b, a bottom member 208a, and a central member 208c located between the top member and the bottom member. The top member and the central member together define an upper circumferential groove, and the bottom member and the central member together define a lower circumferential groove. The top member and the bottom member are fixedly connected to the central member, thereby clamping the first claw member and the second claw member at the central member and fixing them together.

[0071] It should be understood that certain features of the present application described in different embodiments for clarity can be provided in combination in a single embodiment. Moreover, for the sake of brevity, the various features of the present application described in the context of a single embodiment can be provided individually or in any suitable sub-combination. It should be noted that certain features of the embodiments are shown by way of non-limiting examples. Moreover, those skilled in the art will be aware of the prior art not explained above for the sake of brevity.

Claims

1. A hair clip, comprising a first claw member, a second claw member and an integrally formed extension body, wherein: The first claw member and the second claw member both have a front portion, a rear portion and a connecting portion disposed between the front portion and the rear portion. The rear portions of the first claw member and the second claw member serve as a pair of handles for controlling the opening or closing of the hair clip. The extension body is disposed between the first claw member and the second claw member at the connecting portion to serve as a hinge. The first claw member and the second claw member can reciprocally rotate relative to each other at the hinge. The extension body is made of a polymer material and has a front region and a rear region. The front region includes a plurality of tension cords, and a gap is provided between the tension cords and the rear region, so that the tension cords and the rear region can be operated independently of each other. Each connecting portion of the first claw member and the second claw member defines a through hole at the edge, and the extension body is formed with an upper circumferential groove and a lower circumferential groove at its opposite ends or at its upper and lower ends. Through the engagement of the grooves with the edge, the extension body is fixedly connected to the first claw member and the second claw member by heat sealing or by an adhesive, and The extension body has a first state and a second state. In the first state, when the handles move towards each other, the rear region is compressed and the tension cords are stretched. In the second state, when the handles are released, the tension cords pull the first claw member and the second claw member towards each other, so that the hair clip returns to the closed or initial state.

2. The hairpin according to claim 1, wherein, The opposite ends of the extension body protrude through the connecting portion.

3. The hairpin according to claim 1, wherein, The extension body includes a central member, a top member and a bottom member. The top member and the central member together define the upper circumferential groove, and the bottom member and the central member together define the lower circumferential groove. The top member and the bottom member are fixedly connected to the central member, thereby clamping the first claw member and the second claw member at the central member and fixing them together.

4. The hairpin according to claim 1, wherein, The through hole at the connecting portion is oval, the size and shape of the groove are designed to be complementary to the edge, and the extension body is in the form of an oval connecting member.

5. The hairpin according to claim 1, wherein, The first claw member and the second claw member are made of materials selected from the group including ABS, PP, HIPS, GPPS, PE, nylon, polycarbonate, K-resin, acetal, cellulose acetate, PVC, PET and PLA, and the extension body includes silicone resin.

6. The hairpin according to claim 1, wherein, The first claw member and the second claw member are made of materials selected from the group including ABS, PP, HIPS, GPPS, PE, nylon, polycarbonate, K-resin, acetal, cellulose acetate, PVC, PET and PLA, and the extension body is made of silicone resin.

7. The hairpin according to claim 1, wherein, The hair clip includes four tension cords evenly spaced on the front region of the extension body.

8. The hairpin according to claim 1, wherein, The hair clip does not have any metal parts.

9. The hairpin according to claim 1, wherein, At least the hinge does not have any metal parts.

10. A hair clip, comprising a first claw member, a second claw member and an extension body, wherein: Both the first claw member and the second claw member have a front portion, a rear portion, and a connecting portion disposed between the front portion and the rear portion. The rear portions of the first claw member and the second claw member serve as a pair of handles for controlling the opening or closing of the hairpin. The extension body includes a top member, a central member, and a bottom member. The central member is disposed between the first claw member and the second claw member at the connecting portion to serve as a hinge. The first claw member and the second claw member are capable of reciprocating rotation relative to each other at the hinge. The top member and the bottom member are fixedly connected to the central member through the first claw member and the second claw member, thereby sandwiching and fixing the first claw member and the second claw member together at the central member. The extension body is made of a polymer material, and each connecting portion of the first claw member and the second claw member defines a through hole with an edge. The extension body is formed with an upper circumferential groove and a lower circumferential groove at its opposite ends or its upper and lower ends. Through the engagement of the groove with the edge, the extension body is fixedly connected to the first claw member and the second claw member by heat sealing or by an adhesive. The extension body has a first state and a second state. In the first state, when the handles move towards each other, the rear region of the central member is compressed and the front region of the central member is stretched. In the second state, when the handles are released, the front region of the central member pulls the first claw member and the second claw member towards each other, thereby returning the hairpin to the closed or initial state.

11. A method of manufacturing a hairpin, the hairpin being the hairpin according to claim 10, the manufacturing method including the step of connecting the top member, the bottom member, and the central member of the extension body to the first claw member and the second claw member.

12. A method of manufacturing a hairpin, the manufacturing method including the following steps: Forming a pair of hairpin members, the hairpin members including a first claw member and a second claw member; both the first claw member and the second claw member have a front portion, a rear portion, and a connecting portion disposed between the front portion and the rear portion; Forming a through hole at each connecting portion of the first claw member and the second claw member; the through hole is defined by a pair of edges formed on the first claw member and the second claw member; Forming only by injection molding a hinge of an extension body made of a polymer material, the extension body including a front region and a rear region, the front region being in the form of a plurality of tension cords, and there being a gap between the tension cords and the rear region of the extension body. The extension body is formed with an upper circumferential groove and a lower circumferential groove at its opposite ends or its upper and lower ends; and the extension body is disposed at the connecting portion between a pair of claw members, and the extension body is fixedly connected to the first claw member and the second claw member at the connecting portion. Through the engagement of the groove with the edge, the extension body is fixedly connected to the first claw member and the second claw member by heat sealing or by an adhesive.

13. The manufacturing method according to claim 12, the manufacturing method including the step of connecting the extension body to the first claw member and the second claw member such that opposite ends of the extension body both protrude through the through holes at the connecting portion.

14. The manufacturing method according to claim 12, wherein, The extension body includes a top member, a central member, and a bottom member. The top member and the bottom member clamp the first claw member and the second claw member at the connection portion and are connected to the central member, thereby fixing the extension body to the hairpin.

15. The manufacturing method according to claim 12, wherein, The hairpin has no metal parts.

16. The manufacturing method according to claim 12, wherein, At least its hinge has no metal parts.

17. The manufacturing method according to claim 12, wherein, The extension body is in the form of an oval connecting piece.

18. The manufacturing method according to claim 12, wherein, The first claw member and the second claw member are made of a material selected from the group consisting of ABS, PP, HIPS, GPPS, PE, nylon, polycarbonate, K-resin, acetal, cellulose acetate, PVC, PET, and PLA, and the extension body includes silicone resin.

19. The manufacturing method according to claim 12, wherein, The first claw member and the second claw member are made of a material selected from the group consisting of ABS, PP, HIPS, GPPS, PE, nylon, polycarbonate, K-resin, acetal, cellulose acetate, PVC, PET, and PLA, and the extension body is made of silicone resin.

20. The manufacturing method according to claim 12, the manufacturing method includes uniformly and spacedly arranging four tension cords on the front part of the extension body.

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