Detachable headband and magnetic attachment method

Abstract

The present invention discloses a headgear comprising a headband wherein the headband is composed of two or more separate pieces wherein at least a first headband piece has a first side adapted to contact and releasably secure to a second side of a second headband piece, and wherein a plurality of attachment means are arranged along the first side and the second side wherein the attachment means are oriented such that an interconnection occurs between the attachment means on the first side and the attachment means on the second side when the first headgear piece is arranged in a predetermined desired relative position and close relative to the second headgear piece. In addition, a method of assembling and disassembling such a headgear is described.

Description

Invention Field

[0001] This invention relates to a headwear device, particularly a part of a headwear device connection device, such as, for example, a headphone device, a headphone transducer, earpieces, VR or AR goggles, lights, headphones, ear / hearing protectors, etc.

[0002] Headphones typically include a headband that fits to the user's head. A headphone device or other device is attached to at least one or both ends of the headband. Headphone devices can be of various types, including supra-aural headphones (on-ear or cushioned headphones) and over-ear headphones (over-ear or full-face headphones) or other devices as will be mentioned in the following description.

[0003] A headband holds a pair of headphones in place by sitting on the user's head, positioning the headphones or other devices on or near the user's ears. Typically, the headband elastically biases the headphones against the user's ears or the sides of the user's head, thus clamping the headphones to the user's head. More specifically, the headband is usually made of an elastic material, and when not mounted on the user's head, the distance between the headphones is narrower than the typical distance between the user's ears. Therefore, when the headphones are pulled open to fit the user's ears by flexing the elastic material of the headband, this creates an elastic bias in the headband that clamps the headphones against the user's ears or the sides of the user's head. Existing headbands can be adjusted to change their length for better fit to a range of head sizes and shapes. The position and angle of the headphones can also be adjusted via a connector on the headband.

[0004] Devices, particularly headphones, headphone transducers, and the earpieces that make up the headphone assembly, typically have a very long expected lifespan. The headband, which fits between the two headphone components, the headphone transducers, and the earpieces and contacts the user's head, is exposed to wear and other effects, such as when held by the user. The headband can deteriorate over time to the point where the entire headphone construction is discarded. Therefore, parts exposed to use and wear can be advantageously replaced with new parts, thereby significantly extending the effective expected lifespan of the entire construction, especially the more expensive parts, namely the transducers. In some cases, users may also desire to change the appearance of the headband, for example, with changes in fashion. Replaceable parts also allow for changes in the overall appearance of the device. Background of the Invention

[0005] In this field, see, for example, WO2016024895, examples of headphone constructions exist where transducers are connected by a steel band or rigid wire or other rigid material, which is then covered by a padded cover. Typically, the padded cover surrounds the band or wire construction and is held in place by a Velcro or button or other suitable device to secure the padded cover to or around the band or wire. In addition to the mechanical connection between the two transducers, there is usually a wire-shaped electrical connection, so if the padded cover is removed, the band or wire will be exposed. If or when installing a new padded cover, the wires and steel wires connecting the transducers will need to be fitted within the padded cover. This can be cumbersome and difficult for the user to perform.

[0006] In other configurations, the connections between transducers can be flexible yet still relatively rigid, with channels provided to accommodate wires, etc. Padded covers are attached to the rigid parts, for example, via hooks and catches. Purpose of the invention

[0007] Therefore, there seems to be a need for a headband construction that does not appear to be assembled, or provides a more advanced construction when the headband covering is changed for aesthetic purposes or due to wear, without having to submit the headband construction to a specialized workshop. Invention Description

[0008] The present invention solves this problem by a headband comprising a headband consisting of two or more separate components, wherein at least a first headband component has a first side adapted to contact and releasably attach to a second side of a second headband component, and wherein a plurality of attachment devices are arranged along the first and second sides, wherein the attachment devices are oriented such that when the first headband component is arranged relative to the second headband component in a predetermined desired relative position and is close together, the attachment devices on the first side and the attachment devices on the second side are interconnected.

[0009] The predetermined desired relative position is the relative position between two headband components, where, for example, there is symmetry, or where an attachment device on one headband component is positioned opposite and adjacent to a corresponding attachment device on the other headband component. This position can be indicated by markings or mechanical means, such as a hook (peg) on ​​one headband component adapted to be received in a hole in the other headband component.

[0010] Furthermore, a headband may have guide grooves between the distal ends of a particular headband to accommodate cables, etc., and the second headband may be padded to increase user comfort. In particular, when the headband is designed to allow the user to disassemble and reassemble it (potentially with a new headband), it is important that critical components such as wiring and / or other electronic devices are protected and not exposed or touched during headband replacement.

[0011] In another preferred embodiment, the first headband member has a first distal end and a second distal end at opposite ends, and wherein at least one of the distal ends is provided with means for mechanical and / or electrical connection with a device that is part of the head-mounted equipment. The headband configuration can be prepared for and adapted for use with various "appliances," such as, for example, one or more combinations of: AR / VR goggles, earpieces, headphones, headsets, hearing protection devices, and lights. Since the headband itself provides the functionality necessary to hold the headband in the correct position on the user, devices such as transducers (headsets) can be arranged at the distal end of the headband. The headband configuration, particularly the first headband member, allows for the accommodation of wires, etc., which are necessary for the proper operation of devices arranged at the distal end of the headband.

[0012] In another particularly preferred embodiment, the attachment device is a magnet, and the magnetic poles of the magnet are oriented such that when the first headband and the second headband are brought close together in a predetermined desired relative position, the magnets on the first headband and the second headband attract each other.

[0013] Magnets offer several advantages. First, due to the polarity of the magnets, attraction is impossible when magnetic poles of the same polarity overlap. Therefore, the headband pieces can only be positioned correctly relative to each other, ensuring proper assembly. Of course, if one headband piece is displaced enough that a magnet of one polarity is positioned close to a magnet of the opposite polarity due to severe misalignment, thus causing attraction, the two headband pieces may be improperly assembled. However, due to the relative displacement of the two headband pieces, it will be apparent to the user that the headband pieces are not properly positioned. The distal ends of the two headband pieces will not be in the correct position. A second advantage of using magnets is that the surface of the magnet can be covered with a thin layer of material without losing most of the magnetic force. Therefore, the headband design can be more "simple / pure" because the magnet does not need to be visible on the proper surface of the headband piece. Third, it is less likely to damage or destroy the attachment device when the headband piece is held. The magnet will remain intact, while devices such as Velcro®, barbs, or other physical protrusions may be damaged or otherwise rendered useless.

[0014] In an alternative embodiment, the attachment device is a hole and a barb, wherein the hole is arranged on one of the first and second headbands, and the barb is arranged on the other headband, wherein the barb fits into the hole when the first and second headbands are pressed together. This naturally provides a very strong fastening between the two headbands. Furthermore, by arranging the barbs and holes at specific intervals along the mating surfaces, the spacing or distance between adjacent barbs / holes can be designed so that the two headbands can only be connected in the correct manner.

[0015] In another alternative embodiment, the attachment device is a Velcro®, wherein a first strip or multiple Velcro strips are arranged on a headband and a second strip or multiple Velcro strips are arranged on a second headband.

[0016] As can be clearly seen from the description, one or more devices mounted on the headband can be one or more combinations of the following: AR / VR goggles, earpieces, headphones, headsets, headset transducers, headset devices, hearing protection devices, and lights.

[0017] In a further preferred embodiment, a first headband member has a first distal end and a second distal end at opposite ends of the first headband member, and a second headband member has a first distal end and a second distal end at opposite ends of the second headband member. A hook with an overhang raised relative to the surface of the second side is provided on one or both distal ends adjacent to the second side of the second headband member. A hole adapted to receive and retain the hook on the second side of the second headband member is provided adjacent to one or both distal ends of the first headband member. By additionally providing a hook on one headband member, which engages with a hole on the opposite headband member, the two headband members are assembled, achieving the correct relative position between the two headband members. Furthermore, the mechanical engagement between the two headband members ensures a better connection and minimizes the risk of disengagement between the headband members. To insert the hook into the hole, the headband members must be flexed relative to each other so that the hook can enter the hole. When the flexing is released, the displacement between the two headband members will cause the overhang of the hook to engage with the periphery of the hole.

[0018] In a preferred embodiment, the first headband and the second headband have corresponding first and second distal ends at their opposite ends, and wherein magnets are arranged symmetrically on both sides of the midpoint between the distal ends along the first and second sides of the first headband and the second headband.

[0019] To further maintain the mechanical contact between the hook and the hole as described above, another advantageous embodiment provides magnets arranged in the hook and the hole such that the magnets attract each other when the hook is inserted into the hole.

[0020] Another preferred embodiment provides that the second headband and the first headband are flexible, and wherein at least a portion of the first side includes connecting sections that are flexibly connected, and wherein a spring element is arranged between at least two adjacent sections, allowing the adjacent sections to move away from and toward each other. This flexibility allows the headband to fit the user in a defined manner without feeling loose or potentially losing its grip. Furthermore, the flexibility provides the ability to stretch one headband relative to the other to allow hooks to be arranged in the holes as described above. In addition to allowing the assembled headband to easily deform during fitting to the user's head, the built-in flexibility provides some elastic force that pushes the device attached to the distal end of the headband toward the user's head for a secure and comfortable fit. The flexibility also allows the first and second headbands to translate relative to each other, thereby enabling the use of the mechanical connections disclosed in other embodiments.

[0021] Naturally, the second headband has a cover on the side opposite to the second side, the cover being optionally a padded cover, and further, when the first side and the second side are properly installed, the cover or the padded cover covers at least a portion of the first headband.

[0022] In yet another advantageous embodiment, the second headband and the first headband are arched, wherein when the second headband and the first headband are assembled by bringing the first side and the second side into contact, a headband is formed, thereby having a composite arched headband.

[0023] The present invention also discloses a method for assembling the headband as described above, the headband including a first headband member and a second headband member, wherein a first plurality of magnets are arranged adjacent to a first side of the first headband member, and a second plurality of magnets are arranged adjacent to a second side of the second headband member, such that when the first headband member and the second headband member come into contact, the magnets attract each other and releasably secure the first headband member relative to the second headband member.

[0024] Overall, this method utilizes all the advantageous features of the headband as described above.

[0025] In another embodiment of the method, the first and second headbands are arched, allowing the first headband to be fitted with the second headband. Assembly and disassembly are performed by sliding the first headband relative to the second headband, thereby causing the magnets brought onto the first headband to attract the position of the magnets on the second headband. In another advantageous embodiment of the method, the sliding of the first headband relative to the second headband is performed by displacing the arched headband, such that a plurality of magnets are arranged along and adjacent to the first and second sides, wherein the magnets are oriented such that when the first headband is in the correct position relative to the second headband, the magnets on the first side and the magnets on the second side attract each other, and wherein when the first and second headbands are not in the correct relative position, at least some of the magnets repel each other.

[0026] In another advantageous embodiment of the method, the second headband has a first distal end and a second distal end at opposite ends of the second headband, and the first headband has a first distal end and a second distal end at opposite ends of the first headband, wherein one or both distal ends adjacent to the second side of the second headband are provided with hooks having protrusions raised relative to the surface of the second side, and wherein the first distal end and / or the second distal end adjacent to the first side of the first headband are provided with holes such that by inserting the hook into the holes, the holes will receive the protrusions of the hooks, thereby receiving and holding the hooks on the second side of the second headband, assembling the first headband and the second headband into a headband.

[0027] Moreover, in another advantageous embodiment, the method includes: a protrusion adjacent to the hook and a magnet arranged in the hole such that when the hook is inserted into the hole, the magnet in the hook and the magnet in the hole will attract each other. Attached Figure Description

[0028] Various examples are described below with reference to the accompanying drawings. Throughout the text, similar reference numerals refer to similar elements. Therefore, similar elements will not be described in detail again for each drawing. It should also be noted that these figures are intended only to facilitate the description of examples. They are not intended as an exhaustive description of the claimed invention or a limitation on the scope of the claimed invention. Furthermore, the illustrated examples need not possess all the aspects or advantages shown. The aspects or advantages described in connection with a particular example are not necessarily limited to that example and may be practiced in any other example even if not so illustrated or so explicitly described.

[0029] Exemplary embodiments of the invention are described in the accompanying drawings, wherein: Figure 1 A perspective view of an embodiment of the headband is shown; Figure 2 The headband is shown partially removed; Figure 3 A headset incorporating a headband according to the invention is shown; Figure 4 A cross-section through the headband is shown; Figure 5 Details of the hook are shown; Figure 6 Details of the hole are shown; Figure 7 The details of the interaction between the hook and the hole are shown; Figure 8 The flexible elements of the second headband and the first headband are shown.

[0030] List of reference numerals 1. Assembled headband 10 First headband 12. Remote 14. Remote 16, 16' connecting device 17. The bent portion of the first head belt 18. The bent part of the second head belt 19, 19' magnets 20 Second headband 22 First side of the first headpiece 23 The second side of the second headpiece 24, 24' magnets 26 Magnets 30. Headphone Construction 31 Magnets 32, 34 Headphones / Transducers 40 hooks 42 Hook protrusion 44 holes 45 Covering elements 46 Flexible element of the second head belt 48 Flexible element of the first headpiece Sections 50 and 52 of flexible elements 50' and 52' adjacent sections 54 Spring elements 62 and 64 represent moving arrows.

[0031] Detailed description of the invention Exemplary examples will now be described more fully below with reference to the accompanying drawings. In this regard, these examples may take different forms and should not be construed as limited to the description set forth herein. Therefore, the examples will be described below only with reference to the accompanying drawings to explain various aspects.

[0032] Throughout the specification, when an element is referred to as being “connected” to another element, the element is “directly connected” to the other element, “electrically connected,” “fluidly connected,” or “communically connected” to the other element, with one or more intermediate elements in between.

[0033] The terminology used herein is for the purpose of describing particular examples only and is not intended to be limiting. As used herein, when used in this specification, the terms “comprises,” “comprising,” “includes,” and / or “including” specify the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0034] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be further understood that terms such as those defined in conventionally used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant field, and will not be given an idealized or overly formalized interpretation in this specification unless expressly defined herein.

[0035] exist Figure 1 The image shows an assembled headband 1. The headband 1 is assembled from two main components: a first headband component 10 and a second headband component 20. Connecting devices 16 and 16' are provided at the distal ends 12 and 14 of either the first headband component 10 or the second headband component 20. In this embodiment, connecting devices 16 and 16' are shown at both distal ends 12 and 14 of the first headband component 10. However, it is conceivable that the connecting device may be provided only at one distal end 12 or 14. The connecting devices 16 and 16' can, for example, be connected to a headset (transducer), VR / AR goggles, a light, or a headset (transducer) for one ear, optionally combined with a microphone.

[0036] like Figure 2 As shown, the headband 1 is assembled from two parts: a first headband part 10 and a second headband part 20. Both the first headband part 10 and the second headband part 20 are arched, allowing the assembled headband 1 to fit on the user's head. The headband is preferably flexible, allowing it to easily adapt to different head sizes, and tends to have some inward deflection during use, thereby pushing the devices attached to the connecting devices 16, 16' towards the user's head.

[0037] The first headband 10 has a first side 22 with a bend 17. The second headband 20 has a second side 23 with a bend 18. Since the first headband 10 and the second headband 20 are flexible, the two headbands can be assembled as follows: Figure 1 The headband shown is 1.

[0038] For example, in Figure 3 The diagram shows the headband 1 of the present invention used in a headset configuration 30, wherein headsets / transducers 32, 34 are arranged at both ends of the headband 1. As mentioned above, the headsets / transducers 32, 34 can be replaced by any suitable device.

[0039] exist Figure 4 The image shows a cross-section of the headband 1 according to the invention. A plurality of magnets 31 are arranged along the bend 17 of the first side 22 of the first headband 10. Similarly, magnets 26 are provided along the bend 18 of the second side 23 of the second headband 20. The magnets 26 arranged in the second headband 20 and the corresponding magnets 31 arranged in the first headband 10 are arranged at the same distance along the bends 17 and 18, such that when the second headband 20 and the first headband 10 are positioned correctly (i.e., as shown in the image), they are positioned at the same distance. Figure 1 When determining the desired position (as shown), magnet pairs 26 and 31, including magnets from the second headband 20 and magnets from the first headband 10, will overlap. Magnets 26 and 31 can be spaced apart along the bend at any suitable distance, as long as the magnets on the opposing headbands are arranged with the same spacing, such that when the two headbands 10 and 20 are assembled, a magnet on one headband will be attracted to a magnet on the other headband. Correct assembly can be ensured by further arranging magnets with a changing polarity order, i.e., changing the south and north poles along the inner surfaces 22 and 23, through the attraction or repulsion of the magnets. Furthermore, if the facing magnets 31 and 26 on the two pieces are not properly aligned, the first headband 10 and the second headband 20 may not be able to be assembled, such that the north pole magnet is superimposed on the south pole magnet to produce the desired attraction, i.e., the magnet pairs are arranged such that they will attract each other, i.e., the north pole is arranged to face the south pole. If the first headband 10 is not correctly positioned relative to the second headband 20, there will be no attraction between the magnets, and thus no attraction between the first headband 10 and the second headband 20 (due to the lack of a suitable pair of magnets close together), or the magnets will repel each other when like poles (north-north or south-south) are close together. This arrangement naturally guides assembly, making it very easy to correctly control the assembly of the first headband 10 and the second headband 20.

[0040] In some embodiments, additional magnet assemblies 19, 19', 24, 24' are arranged near the distal end of the first headband 10 and at corresponding positions in the second headband 20. For example... Figure 5 , Figure 6 and Figure 7 As shown, these magnets are arranged to connect with the arrangement of hook 40 and hole 44.

[0041] The second headband 20 includes a hook 40 comprising a protrusion 42. Magnets 24, 24' (not visible) are arranged within the protrusion 42. (Refer to the accompanying drawings.) Figure 6 A portion of the first headband 10 is shown, in which an oblong aperture 44 is provided. The periphery of the aperture 44 corresponds to the periphery of the hook 40 and the protrusion 42 in the second headband 20, such that the hook 40 can be inserted into the aperture 44. Within the aperture, behind the cover element 45, magnets 19, 19' (not visible) are provided. These magnets 19, 19' have a magnetic pole orientation opposite to that of the magnets 24, 24' in the hook 40, such that a strong attraction is generated when the two magnets 19, 19', 24, 24' respectively arranged in the hook 40 and the aperture 44 are brought close together.

[0042] The hooks 40 and holes 44 are arranged similarly on both sides of the first headband 10 and the second headband 20.

[0043] Geometrically, the first and second headband members are designed such that, in order to insert the hook 40 into the hole 44, the first headband member 10 needs to be slightly bent outward (i.e., slightly straightened). This allows the hook 40 to be inserted into the hole 44. Once the hooks 40 on both sides of the headband are inserted into the hole 44, the first headband member 10 can be released, allowing the protrusion 42 to slide below the edge of the hole 44. In this way, a mechanical connection is provided.

[0044] exist Figure 7 The cross-section shown illustrates the aforementioned mechanical connection. Arrows 62 and 64 indicate the relative movement of the first headband 10 and the second headband 20 during the mechanical connection.

[0045] exist Figure 8 The figure shows the flexible elements of the second headband 20 and the first headband 10. Pads, lines, and other features are not shown in this figure. The flexible elements 46 and 48 are composed of segments 50 and 52, and at least a portion of the first side 22 and the second side 23 includes connecting segments 50 and 52. These segments are flexibly connected such that a spring element 54 is arranged between at least two adjacent segments 50' and 52', allowing adjacent segments 50' and 52' to move away from and towards each other. Figure 1 and Figure 3As can be seen, the headband appears to be a single unit when assembled, with no visible indication that it is actually assembled from two separate pieces. Furthermore, the second headband piece 20 partially surrounds the first headband piece 10, providing the user with additional cushioning for comfort.

[0046] The first headband 10 and the second headband 20 can be provided and combined in various colors. In particular, the second headband 20 can be provided with any texture and padding.

Claims

1. A headband comprising a headband consisting of two or more separate components, wherein at least a first headband component has a first side adapted to contact and releasably secure to a second side of a second headband component, and wherein a plurality of attachment devices are arranged along the first and second sides, wherein the attachment devices are oriented such that when the first headband component is arranged relative to the second headband component in a predetermined desired relative position and is close together, the attachment devices on the first side and the attachment devices on the second side are interconnected.

2. The head-mounted device according to claim 1, wherein, The first headband has a first distal end and a second distal end at opposite ends, and wherein at least one of the distal ends is provided with means for mechanical and / or electrical connection with a device that is part of the headgear.

3. The head-mounted device according to claim 1, wherein, The attachment device is a magnet, and the magnetic poles of the magnet are oriented such that when the first headband and the second headband are brought close together in the predetermined desired relative position, the magnets on the first headband and the second headband attract each other.

4. The head-mounted device according to claim 1, wherein, The attachment device is a hole and a barb, wherein the hole is arranged on one of the first headband and the second headband, and the barb is arranged on the other of the first headband and the second headband, and wherein the barb fits into the hole when the first headband and the second headband are pressed together.

5. The head-mounted device according to claim 1, wherein, The attachment device is a Velcro®, wherein a first strip or multiple Velcro strips are arranged on a headband, and a second strip or multiple Velcro strips are arranged on a second headband.

6. The head-mounted device according to claim 2, wherein, The device can be one or more of the following combinations: AR / VR goggles, earpieces, headphones, headsets, headset transducers, headset devices, hearing protection devices, and lights.

7. The head-mounted device according to claim 1, wherein, The first headband has a first distal end and a second distal end at opposite ends, and the second headband has a first distal end and a second distal end at opposite ends, wherein a hook is provided on one or both distal ends adjacent to the second side of the second headband, the hook having a protrusion raised relative to the surface of the second side, and wherein a hole is provided adjacent to one or both distal ends of the first headband, the hole being adapted to receive and retain the hook on the second side of the second headband.

8. The head-mounted device according to claim 3, wherein, The first headband and the second headband have corresponding first and second distal ends at their respective ends, and wherein the magnet is symmetrically arranged on both sides of the midpoint between the distal ends along the first and second sides of the first headband and the second headband.

9. The head-mounted device according to claim 7, wherein, Magnets are arranged adjacent to the protrusion of the hook and in the hole such that when the hook is inserted into the hole, the magnets attract each other.

10. The head-mounted device according to claim 1, wherein, The second headband and the first headband are flexible, and at least a portion of the first side includes connecting sections that are flexibly connected, and spring elements are arranged between at least two adjacent sections to allow adjacent sections to move away from each other and toward each other.

11. The head-mounted device according to claim 1, wherein, The second headband has a cover on the side opposite to the second side, the cover being optionally a padded cover.

12. The head-mounted device according to claim 11, wherein, When the first side and the second side are properly installed, the cover or the padded cover covers at least a portion of the first headband.

13. The head-mounted device according to claim 1, wherein, The second headband and the first headband are arched, wherein when the second headband and the first headband are assembled by bringing the first side and the second side into contact, a headband with a composite arch is assembled.

14. A method of assembling a headband, the headband comprising a first headband and a second headband, wherein a first plurality of magnets are arranged adjacent to a first side of the first headband and a second plurality of magnets are arranged adjacent to a second side of the second headband, such that when the first headband and the second headband come into contact, the magnets attract each other and releasably secure the first headband relative to the second headband.

15. The method according to claim 14, wherein, The first headband and the second headband are arched, allowing the first headband to be fitted with the second headband. Assembly and disassembly are performed by sliding the first headband relative to the second headband, thereby attracting the position of the magnet on the second headband to the magnet brought onto the first headband.

16. The method according to claim 15, wherein, The sliding of the first headband relative to the second headband is performed by displacing the arched headband such that the plurality of magnets are arranged along and adjacent to the first and second sides, wherein the magnets are oriented such that when the first headband is in the correct position relative to the second headband, the magnets on the first side attract each other, and wherein when the first headband and the second headband are not in the correct relative position, at least some of the magnets repel each other.

17. The method of claim 14, wherein, The second headband has a first distal end and a second distal end at opposite ends, and the first headband has a first distal end and a second distal end at opposite ends, wherein a hook is provided at one or both distal ends adjacent to the second side of the second headband, the hook having a protrusion raised relative to the surface of the second side, and wherein a hole is provided at the first distal end and / or the second distal end adjacent to the first side of the first headband, such that by inserting the hook into the hole, the hole will receive the protrusion of the hook, thereby receiving and holding the hook on the second side of the second headband, assembling the first headband and the second headband into a headband.

18. The method according to claim 17, wherein, A magnet is arranged adjacent to the protrusion of the hook and in the hole, such that when the hook is inserted into the hole, the magnet in the hook and the magnet in the hole will attract each other.

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