Anti-falling multifunctional data line switching structure, data line and electronic equipment

Abstract

The embodiment of the utility model relates to an anti-drop multifunctional data line switching structure, a data line and an electronic device, the anti-drop multifunctional data line switching structure comprises a first joint and a second joint, the first joint and the second joint are mutually matched and plugged to form electrical connection; the first end of the first connector is connected with a data line, and the second end of the first connector is provided with a first plugging part. The first end of the second connector is provided with a second inserting part matched with the first inserting part, and the second end of the second connector is provided with a third inserting part; a connecting notch is formed in the outer side of the first joint; the second connector is provided with a connecting arm, and the end of the connecting arm is provided with a connecting protrusion connected with the connecting notch in a clamped mode. And the connecting bulge moves in the connecting notch, so that the first inserting part and the second inserting part are inserted or separated. According to the embodiment of the utility model, the connecting notches arranged on the first joint and the second joint are clamped with the connecting bulges, so that the multifunctional data line is more flexible and lower in cost.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of digital accessories, and in particular to a multifunctional data cable adapter structure that prevents falling off, a data cable, and an electronic device. Background Art

[0002] This section introduces the background technology that may be relevant to various aspects of the embodiments of the present invention. It is believed that this section can provide readers with useful background information to help readers better understand the various aspects of the embodiments of the present invention. Therefore, it should be understood that the description in this section is for the above purpose and does not constitute an admission of prior art.

[0003] Data cables are the primary means of charging and transferring data between electronic devices, such as smartphones. Android and iPhones are the predominantly used devices. Android phones primarily use data cables with Micro USB and Type-C interfaces, while iPhones use iOS interfaces. Traditional data cables typically have a single connector on one side, which can be USB-A male, Type-C, Lightning, or MircoUSB. This means each cable can only charge devices with a single interface type. This is especially problematic because it cannot be used interchangeably across different devices, making carrying multiple cables with different interfaces a hassle.

[0004] In order to meet the multi-functional needs, some people use one-to-two or one-to-three data cables and adapters with multiple adapters, so that electronic devices with different interface types can be charged with the same data cable. However, this one-to-many data cable requires several branch lines to connect different connectors, which makes it relatively messy. At present, the market generally uses data cables with various adapters to meet the requirement that a multi-functional data cable can be used in more charging scenarios. However, since the adapters of the multi-functional data cables on the existing market use a simple slot connection, the connecting arm is too thin due to the requirements of the external size and cost. Therefore, in actual use, it is easy for the adapter and the data cable to fall off and the multi-functional data cable to be damaged. In order to make the adapter shell of the multi-functional data cable not easy to fall off, the only way is to thicken the connecting arm to increase the clamping force. This causes a lot of force to be stretched and installed during assembly, which reduces the efficiency of assembly and easily damages the product, thereby increasing costs. Utility Model Content

[0005] The technical problem to be solved is how to provide a multifunctional data cable adapter structure, a folding support mechanism and a shielding device that are easy to store.

[0006] In response to the deficiencies in the prior art, the embodiments of the present invention provide a multifunctional data cable adapter structure, a folding support mechanism, and a shielding device that are convenient for storage, which can effectively realize the vertical disassembly and storage of the front windshield.

[0007] In a first aspect, an embodiment of the present invention provides a multifunctional data cable adapter structure that prevents falling off, comprising:

[0008] a first connector and a second connector, wherein the first connector and the second connector cooperate with each other to form an electrical connection;

[0009] The first end of the first connector is connected to a data cable, and the second end of the first connector is provided with a first plug-in portion;

[0010] The first end of the second connector is provided with a second plug portion that matches the first plug portion, and the second end of the second connector is provided with a third plug portion;

[0011] A connecting notch is provided on the outer side of the first joint;

[0012] The second joint is provided with a connecting arm, and the end of the connecting arm is provided with a connecting protrusion that is engaged with the connecting notch;

[0013] or,

[0014] The second joint is provided with a connecting arm, and the connecting arm is provided with a connecting notch;

[0015] The outer side of the first joint is provided with a connecting protrusion that is engaged with the connecting notch;

[0016] The connecting protrusion moves in the connecting notch to connect or disconnect the first plug-in portion with the second plug-in portion.

[0017] In some other embodiments of the multifunctional data line adapter structure described in this specification,

[0018] The connecting protrusion is provided with a mushroom head structure and a connecting rod portion;

[0019] An accommodating space for the mushroom head structure to move is provided inside the connecting notch;

[0020] The width of the connecting notch is slightly smaller than the outer diameter of the mushroom head structure, and the outer diameter of the connecting rod is slightly smaller than the width of the connecting notch, so that the connecting protrusion can slide smoothly in the connecting notch.

[0021] In some other embodiments of the multifunctional data line adapter structure described in this specification,

[0022] A side of the mushroom head structure close to the connecting notch is a plane.

[0023] In some other embodiments of the multifunctional data line adapter structure described in this specification,

[0024] The first joint includes a first inner mold mechanism formed by injection molding and a connecting shell sleeved on the first inner mold mechanism;

[0025] The connection notch is provided on the connection housing;

[0026] The accommodating space is provided on the first inner mold mechanism.

[0027] In some other embodiments of the multifunctional data line adapter structure described in this specification,

[0028] The first connector further includes a first circuit connector, one end of which is welded with a data line; the other end of the first circuit connector is provided with a first plug-in portion, and the first circuit connector is covered with the first inner mold mechanism.

[0029] In some other embodiments of the multifunctional data line adapter structure described in this specification,

[0030] The second joint includes a second inner mold mechanism formed by injection molding and a transfer shell sleeved on the second inner mold mechanism;

[0031] The connecting arm is arranged on the adapter housing.

[0032] In some other embodiments of the multifunctional data line adapter structure described in this specification,

[0033] The second connector further includes a second circuit connector, and a second plug-in portion and a third plug-in portion are respectively provided at both ends of the second circuit connector;

[0034] The second circuit connector is covered with the second inner mold mechanism.

[0035] In some other embodiments of the multifunctional data line adapter structure described in this specification,

[0036] The first plug-in portion is a male connector, and the second plug-in portion is a female connector.

[0037] In a second aspect, the present invention further provides a data cable, comprising a data cable body, a data cable connector, and at least one of the above-mentioned multifunctional data cable adapter structures, wherein the data cable adapter is connected to the data cable body or the data cable connector.

[0038] On the third aspect, the present invention also provides an electronic device, including: a device body and at least one multifunctional data cable adapter structure, the input end or the output end of the multifunctional data cable adapter structure is electrically connected to the device body; the device body can be charged and / or data transmitted by the multifunctional data cable adapter structure; the multifunctional data cable adapter structure is the above-mentioned multifunctional data cable adapter structure.

[0039] As can be seen from the above technical solution, the present invention implements a connecting protrusion that engages the connecting notch provided on the first and second connectors. The connecting protrusion moves within the connecting notch to connect or disconnect the first plug-in portion from the second plug-in portion. This allows for a stable and reliable connection between the adapter housing and the data cable housing, allowing for more flexible design and lower overall costs for the multifunctional data cable. This invention offers the advantages of a simple structure and easier operation and assembly, effectively improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a schematic diagram of the overall structure of an anti-falling multifunctional data cable adapter structure in one embodiment of the present invention;

[0042] Figure 2 This is a side view schematic diagram of a multifunctional data cable adapter structure that is easy to store and prevents from falling off in one embodiment of the present invention;

[0043] Figure 3 This is a schematic cross-sectional view of a multifunctional data cable adapter structure that prevents falling off in one embodiment of the present utility model;

[0044] Figure 4 This is a reference schematic diagram of a plugged-in use state of an anti-drop multifunctional data cable adapter structure in one embodiment of the present utility model;

[0045] Figure 5 This is a reference schematic diagram of a multifunctional data cable adapter structure that prevents falling off in one embodiment of the present invention when it is out of use;

[0046] Figure 6 This is a schematic cross-sectional view of a multifunctional data cable adapter structure in a disengaged state that prevents it from falling off in one embodiment of the present invention;

[0047] Figure 7This is a reference schematic diagram of a multifunctional data cable adapter structure that prevents falling off in one embodiment of the present invention when it is out of use;

[0048] Figure 8 This is a schematic diagram of a multifunctional data cable adapter structure that prevents falling off in another embodiment of the present invention;

[0049] Figure 9 This is a side view schematic diagram of a multifunctional data cable adapter structure that prevents falling off in another embodiment of the present invention;

[0050] Figure 10 This is a schematic cross-sectional view of a multifunctional data cable adapter structure in a disengaged state that prevents it from falling off in one embodiment of the present invention;

[0051] Figure 11 This is a schematic cross-sectional view of a plugged-in state of a multifunctional data cable adapter structure that prevents falling off in one embodiment of the present invention;

[0052] Figure 12 This is a schematic diagram of the overall structure of a first connector of a multifunctional data cable adapter structure that prevents falling off in one embodiment of the present utility model;

[0053] Figure 13 This is a schematic diagram of the overall structure of a connection housing of a multifunctional data cable adapter structure that prevents falling off in one embodiment of the present invention;

[0054] Figure 14 This is a schematic diagram of the overall structure of a second connector of a multifunctional data cable adapter structure that prevents falling off in one embodiment of the present invention;

[0055] Figure 15 This is a schematic diagram of the overall structure of a connection shell of a multifunctional data cable adapter structure that prevents falling off in one embodiment of the present utility model. DETAILED DESCRIPTION

[0056] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0057] like Figures 1 to 10As shown, an embodiment of the present invention provides a multifunctional data cable adapter structure that prevents falling off, including: a first connector 1 and a second connector 2, wherein the first connector 1 and the second connector 2 cooperate with each other to form an electrical connection; the first end 11 of the first connector 1 is connected to the data cable 3, and the second end 12 of the first connector 1 is provided with a first plug-in portion 71; the first end 21 of the second connector 2 is provided with a second plug-in portion 72 that cooperates with the first plug-in portion 71, and the second end 22 of the second connector 2 is provided with a third plug-in portion 73; the outer side of the first connector 1 is provided with a connecting notch 10; the second connector 2 is provided with a connecting arm 20, and the end of the connecting arm 20 is provided with a connecting protrusion 24 that is engaged with the connecting notch 10; the connecting protrusion 24 moves in the connecting notch 10 to connect or disconnect the first plug-in portion 71 and the second plug-in portion 72. The following is a detailed description of the multifunctional data cable adapter structure that is easy to store and prevents falling off provided by an embodiment of the present invention.

[0058] like Figures 1 to 10 As shown, in the embodiment of the present invention, when switching is required, the first plug-in portion 71 is aligned with the second plug-in portion 72, and the first connector 1 and the second connector 2 are pushed in a direction toward each other so that the first plug-in portion 71 and the second plug-in portion 72 are plugged together, and the third plug-in portion 77 can be plugged into an electronic product for use. When switching is not required, the first connector 1 and the second connector 2 are pushed in a direction toward each other and moved away from each other so that the first plug-in portion 71 and the second plug-in portion 72 are disengaged, and the first plug-in portion 71 can be plugged into an electronic product for use.

[0059] In another embodiment of the present invention, the second connector 2 is provided with a connecting arm 20, and a connecting slot 10 is provided on the connecting arm 20; a connecting protrusion 24 that is engaged with the connecting slot 10 is provided on the outer side of the first connector 1; the connecting protrusion 24 moves in the connecting slot 10 to connect or disconnect the first plug-in portion 71 and the second plug-in portion 72.

[0060] like Figures 3 to 11As shown, in the embodiment of the present invention, the connecting protrusion is provided with a mushroom head structure 244 and a connecting rod portion 241; the inner side of the connecting notch 10 is provided with an accommodating space 100 for the movement of the mushroom head structure 244; the width of the connecting notch 10 is slightly smaller than the outer diameter of the mushroom head structure 244, and the outer diameter of the connecting rod portion 241 is slightly smaller than the width of the connecting notch 10, so that the connecting protrusion 24 can slide smoothly in the connecting notch 10. When the mushroom head structure 244 is installed in the connecting notch 10, the curved surface at the front end of the mushroom head structure 244 can be smoothly pressed into the connecting notch 10 by utilizing the elastic deformation of the connecting notch 10 (the material of which can be metal or plastic), and the mushroom head structure 244 can be squeezed into the connecting notch 10. The width of the connecting notch 10 is slightly smaller than the outer diameter of the mushroom head structure 244. When the mushroom head structure 244 enters the connecting notch 10, it cannot fall off and be removed normally due to the inverted buckle. This allows the first joint 1 and the second joint 2 to be effectively and stably connected, and the shape and size of the connecting arm 20 are rarely affected during the connection process. The side of the mushroom head structure 244 close to the connecting notch 10 is a plane. The mushroom head structure 244 forms an inverted buckle, which will hang on the inner side of the connecting notch 10 and will not fall out, and ensure that after assembly, the first joint 1 and the second joint 2 are connected.

[0061] like Figures 6-11 and Figure 12 and Figure 13 As shown, in another embodiment of the present invention, the first connector 1 includes an injection-molded first inner mold mechanism 14 and a connecting shell 15 sleeved on the first inner mold mechanism 14; the connecting slot 10 is provided on the connecting shell 15; the first inner mold mechanism 14 is provided with the accommodating space 100 to ensure that the mushroom head structure 244 is not blocked when sliding in the connecting slot 10. Of course, it can be understood that the embodiment of the present invention is not limited to this, and the accommodating space can also be provided on the inner side of the connecting arm 20. Furthermore, the first connector 1 also includes a first circuit connector 16, one end of the first circuit connector 16 is welded with a data line 3, and the other end is provided with a first plug-in portion 71; the first circuit connector 16 is covered with the first inner mold mechanism 14.

[0062] like Figure 6-11 and Figure 14 and Figure 15As shown, in another embodiment of the present invention, the second connector 2 includes an injection-molded second inner mold mechanism 24 and an adapter housing 25 sleeved on the second inner mold mechanism 24; the connecting arm 20 is disposed on the adapter housing 25. Furthermore, the second connector 2 also includes a second circuit connector 26, with a second plug portion 72 and a third plug portion 73 at each end of the second circuit connector 26; the second circuit connector 26 is covered with the second inner mold mechanism 24.

[0063] The assembly process of the anti-drop multifunctional data cable adapter structure provided by the utility model is as follows: The multifunctional data cable is first assembled by soldering the data cable 3 to the first circuit connector 16, then injection molding the first inner mold mechanism 14, and then assembling (including but not limited to gluing) the connecting housing 15 to form a data cable. The second inner mold mechanism 24, which is injected with glue, is then assembled (including but not limited to gluing) to the adapter housing 25. The connecting protrusion 24 on the connecting arm 20 of the adapter housing 25 is then aligned with the connecting notch 10 of the connecting housing 15, and the connecting protrusion 24 is squeezed into the connecting notch 10 using a tool to form a complete multifunctional data cable.

[0064] like Figures 6 to 11 As shown, in the embodiment of the present invention, the first plug portion 71 is a male connector, and the second plug portion 72 is a female connector. Of course, it is understandable that the first plug portion 71 can also be a female connector, and the second plug portion 72 can also be a male connector. The third plug portion 73 can also be a male or female connector. In the present invention, the first plug portion 71, the second plug portion 72, and the third plug portion 73 can select different types of data interfaces, such as a USB-A male connector, a TYPE-C connector, a LIGHTNING connector, or a MIRCO USB connector.

[0065] To further demonstrate the advanced nature of the anti-drop multifunctional data cable adapter structure provided by the present invention, an embodiment of the present invention further provides a data cable comprising a data cable body 3, a data cable connector, and at least one multifunctional data cable adapter structure according to the above embodiments, wherein the data cable connector is connected to the data cable body or the data cable connector. The input or output end of the data cable connector is electrically connected to the data cable body 3. This data cable exhibits the beneficial effects of the multifunctional data cable adapter structure, which will not be further described here.

[0066] To further demonstrate the advanced nature of the anti-drop multifunctional data cable adapter structure provided by the present invention, an embodiment of the present invention further provides an electronic device, comprising: a device body and at least one multifunctional data cable adapter structure, wherein the input end or the output end of the multifunctional data cable adapter structure is electrically connected to the device body; the device body can be charged and / or data transmitted by the multifunctional data cable adapter structure; the multifunctional data cable adapter structure is the multifunctional data cable adapter structure described in the above embodiment. This electronic device is, for example, but not limited to, a charger, a mobile power supply, a mobile phone, a computer, etc., and has the advantage of high safety in use. The electronic device can be a mobile phone, a computer, etc., and the electronic device has the beneficial effects of the multifunctional data cable adapter structure, which will not be repeated here.

[0067] In summary, the embodiments of the present invention provide a multifunctional data cable adapter structure, data cable, and electronic device that prevents falling out. The first connector and the second connector have connecting notches that engage the connecting protrusion, and the connecting protrusion moves within the connecting notch to connect or disconnect the first plug-in portion from the second plug-in portion. This allows for a stable and reliable connection between the adapter housing and the housing of the data cable, making the design of the multifunctional data cable more flexible and reducing overall costs. The present invention has the advantages of a simple structure and easier operation and assembly, effectively improving production efficiency.

[0068] Finally, it should be noted that in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0069] In addition, relational terms such as "first", "second", etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations, or should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. Moreover, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. Unless otherwise specified or limited, the terms "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical, electrical, or communication connections; direct or indirect connections through an intermediary; and internal communication and interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0070] The specification of the present invention describes a large number of specific details. However, it is understood that embodiments of the present invention can be practiced without these specific details. In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification. Similarly, it should be understood that in order to streamline the disclosure of the present invention and aid in understanding one or more of the various aspects of the present invention, in the above description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly stated in each claim. More precisely, as reflected in the claims, the utility model aspects are less than all the features of the individual embodiments disclosed above. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. It should be noted that, in the absence of conflict or contradiction, the embodiments in this application and the specific features, structures, materials or characteristics described in the embodiments can be combined with each other. The present invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or permutation of these aspects and / or embodiments. In addition, in the absence of mutual contradiction, those skilled in the art may use each aspect and / or embodiment of the present invention alone or in combination with one or more other aspects and / or embodiments thereof.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A multifunctional data cable adapter structure that prevents falling off, characterized in that: include: a first connector and a second connector, wherein the first connector and the second connector cooperate with each other to form an electrical connection; The first end of the first connector is connected to a data cable, and the second end of the first connector is provided with a first plug-in portion; The first end of the second connector is provided with a second plug-in portion that matches the first plug-in portion, and the second end of the second connector is provided with a third plug-in portion; A connecting notch is provided on the outer side of the first joint; The second joint is provided with a connecting arm, and the end of the connecting arm is provided with a connecting protrusion that is engaged with the connecting notch; or, The second joint is provided with a connecting arm, and the connecting arm is provided with a connecting notch; The outer side of the first joint is provided with a connecting protrusion that is engaged with the connecting notch; The connecting protrusion moves in the connecting notch to connect or disconnect the first plug-in portion with the second plug-in portion.

2. The multifunctional data line adapter structure according to claim 1, characterized in that: The connecting protrusion is provided with a mushroom head structure and a connecting rod portion; An accommodating space for the mushroom head structure to move is provided inside the connecting notch; The width of the connecting notch is slightly smaller than the outer diameter of the mushroom head structure, and the outer diameter of the connecting rod is slightly smaller than the width of the connecting notch, so that the connecting protrusion can slide smoothly in the connecting notch.

3. The multifunctional data line adapter structure according to claim 2, characterized in that: A side of the mushroom head structure close to the connecting notch is a plane.

4. The multifunctional data line adapter structure according to claim 2, characterized in that: The first joint includes a first inner mold mechanism formed by injection molding and a connecting shell sleeved on the first inner mold mechanism; The connection notch is provided on the connection housing; The accommodating space is provided on the first inner mold mechanism.

5. The multifunctional data line adapter structure according to claim 4, characterized in that: The first connector further includes a first circuit connector, one end of which is welded with a data line; the other end of the first circuit connector is provided with the first plug-in portion, and the first circuit connector is covered with the first inner mold mechanism.

6. The multifunctional data line adapter structure according to claim 2, characterized in that: The second joint includes a second inner mold mechanism formed by injection molding and a transfer shell sleeved on the second inner mold mechanism; The connecting arm is arranged on the adapter housing.

7. The multifunctional data line adapter structure according to claim 6, characterized in that: The second connector further includes a second circuit connector, and the second plug-in portion and the third plug-in portion are respectively provided at two ends of the second circuit connector; The second circuit connector is covered with the second inner mold mechanism.

8. The multifunctional data line adapter structure according to claim 1, characterized in that: The first plug-in portion is a male connector, and the second plug-in portion is a female connector.

9. A data line, characterized in that: It comprises a data cable body, a data cable connector and at least one multifunctional data cable adapter structure according to any one of claims 1 to 8, wherein the data cable adapter is connected to the data cable body or the data cable connector.

10. An electronic device, characterized in that: include: A device body and at least one multifunctional data line adapter structure, wherein an input end or an output end of the multifunctional data line adapter structure is electrically connected to the device body; The device body can be charged and / or data transmitted by the multifunctional data cable adapter structure; The multifunctional data line switching structure is the multifunctional data line switching structure according to any one of claims 1 to 8.

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