Helmet Structure

Abstract

This utility model relates to a helmet structure, comprising: a helmet body; a lens; and a magnetic suction device clamping onto the lens; wherein the magnetic suction device is capable of adsorbing onto the helmet body, thereby adsorbing the lens onto the helmet body. This utility model can improve the stability, safety, and ease of operation of the helmet lens under various conditions.

Description

Technical Field

[0001] This utility model relates to the field of everyday sports equipment technology, and in particular to a helmet structure. Background Technology

[0002] Currently, helmets in existing technology are typically equipped with rotatable visors to meet protection needs in different environments. However, this common rotating structure has significant drawbacks. When users are engaged in high-speed activities (such as motorcycling or downhill skiing), they encounter strong airflow, which can cause the visor to loosen or even rotate unexpectedly. This not only compromises the helmet's airtightness, allowing dust, rain, or other foreign objects to enter and obstruct vision, but more seriously, it can directly interfere with the user's normal vision, posing a serious threat to driving safety.

[0003] Furthermore, when the user does not need to use the visor, the existing visor structure is inconvenient to disassemble and difficult to separate quickly, reducing the flexibility and convenience of helmet use. Traditional designs mainly rely on gravity or the friction of the connecting shaft to maintain the visor's position, which obviously cannot meet the stability requirements of high-speed movement environments. Some improvement solutions attempt to introduce fixing devices, but these are often complex in structure and not convenient to operate, affecting the user experience.

[0004] Therefore, existing helmet structures have significant shortcomings in terms of the stability, safety, and ease of use of windproof visors, necessitating a more reliable, easy-to-operate visor fixation solution that effectively resists wind interference. This is not only crucial for improving helmet performance but also directly related to the user's safety in high-speed motion environments.

[0005] The information disclosed in the background section of this utility model is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a helmet structure that can improve the stability, safety, and ease of operation of the helmet lens under various conditions.

[0007] This utility model provides a helmet structure, including: a helmet body; a lens; and a magnetic suction device that clamps onto the lens; wherein the magnetic suction device can be attracted to the helmet body, thereby attracting the lens onto the helmet body.

[0008] Preferably, the magnetic suction device is elongated and extends along the length of the lens to clamp onto the lens.

[0009] Preferably, the magnetic attraction device includes: an outer sleeve; an inner sleeve located inside the outer sleeve and forming a clamping space with the outer sleeve to clamp the lens; and a first magnet disposed between the outer sleeve and the inner sleeve; wherein a second magnet is disposed on the helmet body at a position corresponding to the first magnet; the first magnet can be attracted together with the second magnet, thereby attracting the magnetic attraction device to the helmet body, and thus attracting the lens to the helmet body.

[0010] Preferably, the edge of the lens is provided with a first protrusion, and the first protrusion is provided with a first through hole; the inner surface of the outer sleeve is provided with a protrusion, and the first through hole is sleeved on the protrusion to install the lens on the inner surface of the outer sleeve.

[0011] Preferably, the inner surface of the outer sleeve is provided with a positioning post, and the outer surface of the inner sleeve is provided with a positioning groove that mates with the positioning post.

[0012] Preferably, the inner sleeve is further provided with a support plate for supporting the lens.

[0013] Preferably, the outer surface of the inner sleeve is provided with a blind hole for accommodating the first magnet, and the inner sleeve is also provided with a second through hole communicating with the blind hole, wherein the width and / or length of the blind hole is smaller than the width and / or length of the second through hole.

[0014] Preferably, the first through hole and the protrusion are elongated and extend along the length of the lens.

[0015] Preferably, the magnetic suction device is provided with a mounting cavity, a mounting post is provided in the mounting cavity, the lens is provided with a second protrusion, and the second protrusion is provided with a slot corresponding to the mounting post; the second protrusion is inserted into the mounting cavity, and the slot can be locked onto the mounting post to mount the lens on the magnetic suction device; the magnetic suction device is provided with a mounting groove with an opening facing the helmet body, and a first magnet is installed in the mounting groove.

[0016] Preferably, the mounting groove includes a first mounting groove portion and a second mounting groove portion; wherein the length of the first mounting groove portion is greater than the length of the second mounting groove portion; and / or the width of the first mounting groove portion is greater than the width of the second mounting groove portion.

[0017] This invention relates to a helmet structure that uses a magnetic clamp to hold the visor, allowing the visor to be detachably mounted to the helmet body via the magnetic attraction between the clamp and the helmet. When the visor is not needed, the magnetic clamp can be forcefully removed from the helmet body, thereby removing the visor. Alternatively, the magnetic clamp and visor can be removed as a whole, and the assembly can be flipped over so that the visor faces upwards, then magnetically attached to the helmet body. This invention improves the stability, safety, and ease of use of the helmet visor in various configurations.

[0018] The device of this invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and subsequent embodiments incorporated herein, which together serve to explain the particular principles of this invention. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the helmet structure according to the embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the combination of the lens and the magnetic attraction device in Embodiment 1;

[0021] Figure 3 This is a schematic diagram of the combination of the lens and the magnetic attraction device in Embodiment 1 at another angle;

[0022] Figure 4 for Figure 2 A schematic diagram of the decomposition process;

[0023] Figure 5 for Figure 3 A schematic diagram of the decomposition process;

[0024] Figure 6 This is a three-dimensional structural diagram of the outer component in Example 1;

[0025] Figure 7 This is a schematic diagram of the internal component in Example 1;

[0026] Figure 8 This is a schematic diagram of the internal component in Embodiment 1 from another perspective;

[0027] Figure 9 This is a schematic diagram of the combination of the lens and the magnetic attraction device in Embodiment 2;

[0028] Figure 10 This is a schematic diagram of the cut-off section of the magnetic attraction device in Example 2;

[0029] Figure 11 for Figure 10 A magnified view of point A in the image;

[0030] Figure 12 This is a perspective view of the magnetic attraction device in Embodiment 2;

[0031] Figure 13 for Figure 12 A magnified view of a section at point B in the middle;

[0032] Figure 14 This is a schematic diagram of the lens structure in Example 2;

[0033] Figure 15 for Figure 14 A magnified view of a section at point C;

[0034] Figure 16 This is a schematic diagram of the cut-off section at the mounting slot in Example 2;

[0035] Figure 17 for Figure 16 A schematic diagram omitting the first magnet;

[0036] Figure 18 This is a schematic diagram of the structure of the first magnet in Example 2.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Helmet body;

[0039] 200, Lens; 210, First protrusion; 211, First through hole; 220, Second protrusion; 221, Slot;

[0040] 300. Magnetic suction device; 301. Mounting cavity; 302. Mounting column;

[0041] 310. Outer casing; 311. Protrusion; 312. Positioning post;

[0042] 320. Inner component; 321. Positioning groove; 322. Blind hole; 323. Second through hole; 324. Support plate;

[0043] 330. First magnet; 331. First part of first magnet; 332. Second part of first magnet;

[0044] 340. Mounting slot; 341. First part of mounting slot; 342. Second part of mounting slot.

[0045] It should be understood that the accompanying drawings are not necessarily drawn to scale, but rather present simplified representations of various features to illustrate the basic principles of this invention. The specific design features disclosed in this invention will be determined in part by the specific application and environment in which they will be used.

[0046] Throughout these figures, the same reference numerals denote the same or equivalent parts of the present invention. Detailed Implementation

[0047] The present invention will now be described in detail with reference to various embodiments, examples of which are presented in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the present invention to these exemplary embodiments. Rather, the present invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments that may be included within the spirit of the present invention and the scope defined by the appended claims.

[0048] The following is combined Figures 1 to 18 The helmet structure of the present invention will be described.

[0049] like Figures 1 to 5 As shown, the helmet structure of this utility model embodiment includes: helmet body 100, lens 200 and magnetic suction device 300.

[0050] The magnetic device 300 is clamped onto the lens 200.

[0051] The magnetic device 300 can be attached to the helmet body 100, thereby attaching the lens 200 to the helmet body 100.

[0052] This invention uses a magnetic suction device 300 to hold the lens 200, and then utilizes the magnetic attraction between the magnetic suction device 300 and the helmet body 100 to detachably mount the lens 200 onto the helmet body 100. When the lens 200 is not needed, the magnetic suction device 300 can be forcefully removed from the helmet body 100, thereby removing the lens 200 from the helmet body 100. Alternatively, the magnetic suction device 300 and the lens 200 can be removed as a whole, and the magnetic suction device 300 and the lens 200 can be reversed so that the lens 200 faces upwards, and then magnetically attracted to the helmet body 100 by the magnetic suction device 300.

[0053] When the lens 200 is needed, it is magnetically attached to the helmet body 100 with the lens 200 facing downwards using the magnetic attraction device 300. This invention can improve the stability, safety, and ease of operation of the lens 200 in various states of the helmet structure.

[0054] In an exemplary embodiment, the lens 200 adopts an elongated structure with a significantly wider extension direction than its width direction, and has an adaptive curvature pre-designed according to the user's facial anatomy or the profile of a standard helmet opening. This elongated structure allows it to fully cover the user's visual field and peripheral vision area in the lateral direction, forming a continuous and uninterrupted wide protective band that effectively blocks side-incident light, wind, sand, and other external interference.

[0055] In an exemplary implementation, such as Figure 4 and Figure 5 As shown, the magnetic suction device 300 has an elongated structure and extends along the entire length of the lens 200 to achieve a stable and uniform clamping effect. This elongated structure is preferably adapted to the contour of the lens 200, allowing it to fully conform to the lens edge during clamping, thereby improving the overall structural harmony and clamping reliability.

[0056] Furthermore, the design of the elongated magnetic suction device 300 facilitates the upright and inverted placement of the lens 200 on the helmet body 100. Because its extension direction aligns with the length direction of the lens 200, providing continuous magnetic force or mechanical fixation in that direction, the lens 200 receives ample support and positioning in any placement posture. This configuration not only improves the flexibility of lens assembly but also enhances stability and operability during use, allowing users to quickly and accurately adjust the lens position according to actual needs.

[0057] Example 1

[0058] In an exemplary implementation, such as Figures 2 to 5 As shown, the magnetic attraction device 300 includes an outer sleeve 310, an inner sleeve 320, and a first magnet 330.

[0059] The inner kit 320 is located inside the outer kit 310 and forms a clamping space with the outer kit 310 to clamp the lens 200.

[0060] The first magnet 330 is disposed between the outer sleeve 310 and the inner sleeve 320.

[0061] The helmet body 100 has a second magnet at the position corresponding to the first magnet 330 (the second magnet is not shown in the figure).

[0062] The first magnet 330 can be attracted together with the second magnet, thereby attracting the magnetic device 300 to the helmet body 100, and thus attracting the lens 200 to the helmet body 100.

[0063] The magnetic suction device 300 is fixed to the lens 200 by clamping, and a first magnet 330 is provided on the magnetic suction device 300. Compared with the prior art of directly fixing the magnet to the surface of the lens 200, this utility model introduces the magnetic suction device 300 as an intermediate support structure, realizing the non-direct contact installation between the first magnet 330 and the lens 200. This design allows for flexible configuration of the number of the first magnets 330 and their arrangement on the magnetic suction device 300 according to actual usage needs without changing the original shape and structure of the lens 200, thereby improving the customizability and adaptability of the magnetic suction function, while avoiding possible structural damage or impact on the optical performance of the lens itself.

[0064] In an exemplary implementation, such as Figure 4 and Figure 5 As shown, the edge of the lens 200 is provided with a first protrusion 210, and the first protrusion 210 is provided with a first through hole 211.

[0065] like Figure 6 As shown, the inner surface of the outer sleeve 310 is provided with a protrusion 311, and the first through hole 211 is fitted onto the protrusion 311 to mount the lens 200 onto the inner surface of the outer sleeve 310. The shape of the protrusion 311 is adapted to the shape of the first through hole 211.

[0066] In an exemplary embodiment, the first through hole 211 and the protrusion 311 are elongated and extend along the length of the lens 200.

[0067] In other embodiments, a protrusion that mates with the first through hole 211 may also be provided on the outer surface of the inner sleeve 320.

[0068] Alternatively, a protrusion may be provided on the first protrusion 210 of the lens 200, and a first through hole may be provided on the inner surface of the outer sleeve 310 and / or the outer surface of the inner sleeve 320, which can also achieve the installation of the lens 200 between the outer sleeve 310 and the inner sleeve 320.

[0069] The mounting method of the lens 200 on the outer kit 310 and / or inner kit 320 is not limited to this, and can be any form in the prior art.

[0070] In an exemplary implementation, such as Figure 6 and Figure 7As shown, the inner surface of the outer component 310 is provided with a positioning post 312, and the outer surface of the inner component 320 is formed with a positioning groove 321 that mates with the positioning post 312. The mating structure of the positioning post 312 and the positioning groove 321 can provide precise positioning in the length direction when the outer component 310 and the inner component 320 are assembled, effectively limiting the relative movement of the two in this direction, thereby avoiding undesirable displacement caused by external forces, protecting the internally installed lens 200 from compression or twisting, and improving the overall stability and reliability of the assembly.

[0071] The positioning posts 312 can be configured as one or more, preferably evenly distributed circumferentially to enhance balance and guidance during the docking process. The shape of the positioning groove 321 is adapted to the positioning post 312, for example, its cross-section can be circular, rectangular or other geometric shapes to achieve a tight fit. In some embodiments, the ends of the positioning posts 312 may be provided with chamfered or tapered guides to facilitate insertion and reduce assembly difficulty.

[0072] In other embodiments, the positions of the positioning post and the positioning groove can be interchanged; that is, the positioning post can be located on the outer surface of the inner component 320, while the positioning groove is formed on the inner surface of the outer component 310. This interchangeable design provides greater flexibility in structural design while maintaining the same positioning and anti-displacement functions, allowing for the selection of a more suitable configuration based on actual assembly requirements or component molding processes.

[0073] Furthermore, the positioning structure and mating groove can also be arranged asymmetrically to further ensure a unique correspondence between the outer component 310 and the inner component 320 in the circumferential direction (i.e., the length direction), thereby preventing incorrect assembly. Regardless of which component the positioning feature is located on, it helps to improve the overall assembly accuracy and durability of the lens module.

[0074] In an exemplary implementation, such as Figure 7 As shown, the inner kit 320 is also provided with a support plate 324 for supporting the lens 200.

[0075] In an exemplary implementation, such as Figure 7 and Figure 8As shown, the outer surface of the inner fitting 320 is provided with a blind hole 322 for accommodating the first magnet 330. This blind hole 322 not only positions and fixes the magnet but also effectively prevents displacement or detachment of the magnet during assembly or use through its closed structure, improving the stability and reliability of the magnet installation. The inner fitting 320 also has a second through hole 323 communicating with the blind hole 322. The width and / or length of the blind hole 322 is smaller than the width and / or length of the second through hole 323. This structure facilitates the insertion of the magnet into the blind hole from one side of the second through hole, while also aiding in positioning and observation during assembly, improving installation efficiency and accuracy, and ensuring accurate positioning and secure connection of the magnet in the working state.

[0076] The first magnet 330 can be rectangular or have an arc extending along the length of the lens 200. The shape of the first magnet 330 can be configured according to the actual situation.

[0077] The first magnet 330 can be inserted from the opening end of the blind hole 322 along its magnetization direction or a specific assembly direction, and form a firm connection with the inner wall of the blind hole 322 by interference fit, adhesive fixation or mechanical pressing. In a preferred embodiment, the depth of the blind hole 322 is slightly greater than or equal to the thickness of the first magnet 330, so that after the magnet is inserted, its outer surface is flush with or slightly lower than the outer surface of the inner component, thereby preventing the magnet from being scratched or bumped during assembly or use.

[0078] To further improve installation reliability, protrusions, slots, or adhesive overflow grooves can be provided on the bottom or side walls of the blind hole 322 to increase the limiting or bonding area for the first magnet 330. In addition, the opening edge of the blind hole 322 can be provided with a guiding chamfer or tapered surface to facilitate the smooth insertion of the magnet and reduce assembly resistance.

[0079] Furthermore, the second through-hole 323 can also be used to inject encapsulating adhesive or sealant after the magnet is installed, thereby further enhancing the fixing strength and moisture-proof and vibration-resistant performance of the first magnet 330. The entire mounting structure takes into account ease of assembly, positioning accuracy, and connection reliability, making it suitable for applications requiring high vibration or high precision.

[0080] In Embodiment 1, the first through hole 211 of the lens 200 is fitted onto the protrusion 311 of the outer sleeve 310 to mount the lens 200 onto the inner surface of the outer sleeve 310. Then, the positioning post 312 of the outer sleeve 310 is aligned with the positioning groove 321 of the inner sleeve 320, and the inner sleeve 320 and outer sleeve 310 are fastened together and secured with bolts (or other means) to ensure that accidental separation does not occur during use. At this time, the magnetic suction device 300 is clamped onto the lens 200; that is, the lens 200 and the magnetic suction device 300 are fixed together.

[0081] When the user needs the lens 200, simply place the lens 200 face down and use the magnetic force of the magnetic device 300 to easily attach it to the helmet body 100. This magnetic attachment method is not only quick and convenient, but also ensures the stability of the lens during use.

[0082] Conversely, if the user no longer needs the lens 200, they can remove the magnetic device 300 from the helmet body 100 by force, and then remove the lens 200 from the helmet body 100. Alternatively, the magnetic device 300 and lens 200 can be removed as a whole, then flipped over so that the lens 200 faces upwards, and then magnetically attached to the helmet body 100 again using the magnetic device 300. This method offers greater flexibility and meets the needs of different usage scenarios.

[0083] If lens 200 is damaged, first separate inner kit 320 from outer kit 310, then remove lens 200 from outer kit 310 and replace it with a new lens 200. Finally, fasten inner kit 320 and outer kit 310 together again and secure them with bolts (or other means).

[0084] Example 2

[0085] In this embodiment, as Figures 9 to 15 As shown, the magnetic suction device 300 is provided with a mounting cavity 301, and a mounting post 302 is provided inside the mounting cavity 301. The lens 200 is provided with a second protrusion 220. The second protrusion 220 is provided with a slot 221 corresponding to the mounting post 302. In this embodiment, the outer kit 310 and the inner kit 320 described above are formed as a single unit, replacing the form in Embodiment 1 where they are formed separately.

[0086] The second protrusion 220 is inserted into the mounting cavity 301, and the slot 221 can be locked onto the mounting post 302 to mount the lens 200 onto the magnetic suction device 300.

[0087] The magnetic device 300 is provided with a mounting groove 340 with an opening facing the helmet body 100, and a first magnet 330 is mounted in the mounting groove 340.

[0088] In an exemplary implementation, such as Figure 16 and Figure 17 As shown, the mounting slot 340 includes a first mounting slot portion 341 and a second mounting slot portion 342.

[0089] The length of the first part 341 of the mounting slot is greater than the length of the second part 342 of the mounting slot. And / or

[0090] The width of the first part 341 of the mounting slot is greater than the width of the second part 342 of the mounting slot.

[0091] In an exemplary implementation, such as Figure 18 As shown, the first magnet 330 includes a first magnet first portion 331 and a first magnet second portion 332. The shape and size of the first magnet first portion 331 are adapted to the shape and size of the mounting groove first portion 341. The shape and size of the first magnet second portion 332 are adapted to the shape and size of the mounting groove second portion 342.

[0092] In Embodiment 2, the second protrusion 220 of the lens 200 is inserted into the mounting cavity 301, and the slot 221 is engaged with the mounting post 302 to mount the lens 200 onto the magnetic suction device 300. At this time, the magnetic suction device 300 is clamped onto the lens 200, that is, the lens 200 and the magnetic suction device 300 are fixed together.

[0093] When the user needs the lens 200, simply place the lens 200 face down and use the magnetic force of the magnetic device 300 to easily attach it to the helmet body 100. This magnetic attachment method is not only quick and convenient, but also ensures the stability of the lens during use.

[0094] Conversely, if the user no longer needs the lens 200, they can remove the magnetic device 300 from the helmet body 100 by force, and then remove the lens 200 from the helmet body 100. Alternatively, the magnetic device 300 and lens 200 can be removed as a whole, then flipped over so that the lens 200 faces upwards, and then magnetically attached to the helmet body 100 again using the magnetic device 300. This method offers greater flexibility and meets the needs of different usage scenarios.

[0095] If the lens 200 is damaged, the lens 200 can be forcefully removed from the outer casing 310 (i.e., the slot 221 disengages from the mounting post 302, and the second protrusion 220 disengages from the mounting cavity 301), and a new lens 200 can be replaced.

[0096] For ease of interpretation and precise definition of the appended claims, the terms “upper,” “lower,” “inner,” “outer,” “above,” “below,” “above,” “below,” “upward,” “downward,” “front,” “back,” “behind,” “inner side,” “outer side,” “inward,” “outer,” “internal,” “external,” “inner,” “external,” “forward,” and “backward” are used to describe the features of the exemplary embodiments with reference to the positions of these features shown in the accompanying drawings.

[0097] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and descriptive purposes. It is not intended to be exhaustive, nor to limit the invention to the precise forms disclosed; obviously, many changes and variations are possible in accordance with the foregoing teachings. The exemplary embodiments were chosen and described to explain the specific principles of the invention and its practical application, thereby enabling others skilled in the art to implement and utilize various exemplary embodiments of the invention, as well as their different alternatives and modifications. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A helmet structure, characterized in that, include: Helmet body (100); Lens (200); A magnetic suction device (300) is used to hold the lens (200); The magnetic suction device (300) can be attached to the helmet body (100), thereby attaching the lens (200) to the helmet body (100); The magnetic attraction device (300) includes: Outer kit (310); The inner sleeve (320), located inside the outer sleeve (310) and forming a clamping space with the outer sleeve (310), is used to clamp the lens (200); and A first magnet (330) is disposed between the outer sleeve (310) and the inner sleeve (320); The helmet body (100) is provided with a second magnet at the position corresponding to the first magnet (330); The first magnet (330) can be attracted together with the second magnet, thereby attracting the magnetic device (300) to the helmet body (100), and thus attracting the lens (200) to the helmet body (100); The edge of the lens (200) is provided with a first protrusion (210), and the first protrusion is provided with a first through hole (211). The inner surface of the outer kit (310) is provided with a protrusion (311), and the first through hole (211) is fitted onto the protrusion (311) to mount the lens (200) on the inner surface of the outer kit (310).

2. The helmet structure according to claim 1, characterized in that, The magnetic suction device (300) is elongated and extends along the length of the lens (200) to clamp onto the lens (200).

3. The helmet structure according to claim 1, characterized in that, The inner surface of the outer sleeve (310) is provided with a positioning post (312), and the outer surface of the inner sleeve (320) is provided with a positioning groove (321) that cooperates with the positioning post (312).

4. The helmet structure according to claim 1, characterized in that, The inner kit (320) is also provided with a support plate (324) for supporting the lens (200).

5. The helmet structure according to claim 1, characterized in that, The outer surface of the inner sleeve (320) is provided with a blind hole (322) for accommodating the first magnet (330). The inner sleeve (320) is also provided with a second through hole (323) communicating with the blind hole (322). The width and / or length of the blind hole (322) is smaller than the width and / or length of the second through hole (323).

6. The helmet structure according to claim 1, characterized in that, The first through hole (211) and the protrusion (311) are elongated and extend along the length of the lens (200).

7. The helmet structure according to claim 1, characterized in that, The magnetic suction device (300) is provided with a mounting cavity (301), and a mounting post (302) is provided in the mounting cavity (301). The lens (200) is provided with a second protrusion (220), and the second protrusion (220) is provided with a slot (221) corresponding to the mounting post (302). The second protrusion (220) is inserted into the mounting cavity (301), and the slot (221) can be engaged with the mounting post (302) to mount the lens (200) onto the magnetic suction device (300); The magnetic attraction device (300) is provided with a mounting groove (340) with an opening facing the helmet body (100), and a first magnet (330) is installed in the mounting groove.

8. The helmet structure according to claim 7, characterized in that, The mounting slot (340) includes a first part (341) and a second part (342). Wherein, the length of the first part (341) of the mounting groove is greater than the length of the second part (342) of the mounting groove; and / or The width of the first part (341) of the mounting groove is greater than the width of the second part (342) of the mounting groove.

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