Turnover mechanism for box and charging box
By using a serpentine elastic component and rotating assembly design in the wireless earphone charging case, the problems of numerous parts, cumbersome assembly, large space occupation, and difficulty in adjusting the feel have been solved, achieving the effects of simplified structure, reduced cost, and improved stability.
Patent Information
- Application Number
- CN202423111866.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing wireless earphone charging cases suffer from numerous components, cumbersome assembly, large space occupation, high production costs, poor stability, and difficulty in adjusting the opening and closing feel.
The lid is opened and closed by using a serpentine elastic element instead of a magnet or snap-fit structure. The opening and closing process is achieved by rotating the upper and lower brackets together with the rotating component design. The compression and release of the serpentine elastic element provides assistance and adjusts the opening and closing feel.
The simplified structure reduces production costs, minimizes space occupation, improves stability and adjustability of opening and closing feel, and enhances user experience.
Smart Images
Figure CN223533992U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic product technology, and more specifically to a box flipping mechanism and a charging box having the flipping mechanism. Background Technology
[0002] Currently, wireless headphones have become the main trend in the headphone industry, including True Wireless Stereo (TWS) headphones, Open Wearable Stereo (OWS) headphones, and bone conduction headphones. Charging wireless headphones typically involves placing them in a charging case, which also serves as a convenient storage solution. Furthermore, the emerging AR glasses, digital smart devices, and other wireless electronic products also require charging case structures similar to those used for headphones.
[0003] The charging case structure of existing common wireless earphones typically includes an upper shell and a lower shell, with the upper shell rotating around the lower shell to open and close. Existing charging case flip-top structures generally use magnets or latches to ensure the stability of the case when closed, while using a torsion spring structure to keep the charging case open.
[0004] This type of design has several drawbacks: First, it has many parts, the assembly process is complicated, it occupies a lot of internal space, and the production cost is high; Second, the product is not securely fixed, and it is only fixed by the magnetic attraction when it is snapped shut. If it is accidentally dropped or bumped, there is a certain probability that the top shell of the earphone case will open, resulting in the loss of the earphones; Third, the damping feel when opening and closing the charging case is not easy to adjust, and it cannot meet the needs of differentiated product opening and closing feel design. Utility Model Content
[0005] The purpose of this utility model is to provide a flipping mechanism for a box and a charging box. The flipping mechanism is convenient to open and close, has a simple structure, occupies little space, can effectively reduce production costs, and can adjust the opening and closing damping by setting a first relative position to meet different opening and closing feel requirements.
[0006] Therefore, this utility model provides a box-type flipping mechanism, which is used to open and close the upper cover assembly and the lower cover assembly of the box body. The flipping mechanism comprises:
[0007] The upper support is flipped up and fixedly connected to the upper cover assembly.
[0008] The lower flip-up bracket is fixedly connected to the lower cover assembly, and the upper flip-up bracket is rotatably connected to the lower flip-up bracket, thereby realizing the opening and closing of the headphone case lid;
[0009] A serpentine elastic element, the two ends of which are rotatably connected to the upper flip bracket and the lower flip bracket, respectively;
[0010] During the rotation of the upper flip bracket around the lower flip bracket, the upper flip bracket, the lower flip bracket, and the serpentine elastic element have a first relative position. When the upper flip bracket rotates towards the first relative position, the serpentine elastic element is compressed. When it is in the first relative position, the compression of the serpentine elastic element reaches its maximum value. After passing the first relative position, the serpentine elastic element releases its elastic force, pushing the upper flip bracket to continue rotating in the same direction, causing the upper cover assembly to close or open to its maximum position.
[0011] Preferably, a first rotating component is provided at the rotatable connection between the upper flip bracket and the lower flip bracket, and the upper flip bracket rotates around the lower flip bracket via the first rotating component;
[0012] The serpentine elastic element is provided with a second rotating component and a third rotating component at the rotatable connection points with the upper flip bracket and the lower flip bracket, respectively. The serpentine elastic element rotates around the upper flip bracket and the lower flip bracket through the second rotating component and the third rotating component.
[0013] Preferably, the first rotating component includes a first bushing and a first rotating shaft. The first bushing is disposed at the end of the lower rotating bracket near the upper rotating bracket, and the first rotating shaft passes through the first bushing and is fixedly connected to the upper rotating bracket at both ends.
[0014] The second rotating component includes a second bushing and a second rotating shaft. The second bushing is disposed on the inner wall of the flip-up upper bracket, and the second rotating shaft passes through the end of the second bushing and the serpentine elastic member near the flip-up upper bracket.
[0015] The third rotating component includes a third bushing and a third rotating shaft. The third bushing is disposed at the end of the lower rotating bracket near the upper rotating bracket, and the third rotating shaft passes through the third bushing and the end of the serpentine elastic member near the lower rotating bracket.
[0016] Preferably, the third bushing is disposed on the first bushing.
[0017] Preferably, the first relative position is unique, and the first relative position is the relative position of the upper flipping bracket, the lower flipping bracket, and the serpentine elastic element when the rotation axes of the first rotating component, the second rotating component, and the third rotating component are in the same plane.
[0018] Preferably, there is a convex structure inside the flipping upper bracket, and the second rotating component is connected to the convex structure and suspended on one side of the flipping upper bracket with the convex structure.
[0019] Preferably, the free state length of the serpentine elastic member is L0, the length in the closed state of the box body is L1, the length when the compression amount reaches the maximum value is L2, and the length when the box body is opened to the maximum position is L3, satisfying L2 < L1 ≤ L0 and / or L2 < L3 ≤ L0.
[0020] Preferably, the serpentine elastic member is composed of at least one section of "S" - shaped folding structure connected together.
[0021] Preferably, the serpentine elastic member is a serpentine spring sheet or a serpentine spring wire.
[0022] The present utility model also provides a headset charging box, which includes the flipping mechanism for the headset box described in any of the above - mentioned solutions and can be used for the storage and / or charging of true wireless headsets, fully open wearable headsets, bone conduction headsets.
[0023] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:
[0024] 1. Replace the upper and lower part magnet design in the existing charging box with a serpentine elastic member, reducing the space occupied by the flipping mechanism in the box body and effectively reducing the cost at the same time.
[0025] 2. Use a serpentine elastic member to rotatably connect the upper and lower flipping brackets. Compared with elastic components of other shapes, it can generate more uniform deformation under the same force conditions, avoiding stress concentration phenomena, thereby improving the service life of the spring and the flipping mechanism.
[0026] 3. Through the combined design of the serpentine elastic member with the first rotating component, the second rotating component, and the third rotating component, during the opening and closing process of the flipping mechanism, there is a first relative position between the flipping upper bracket and the flipping lower bracket. At this time, the compression amount of the serpentine elastic member reaches the maximum value; after rotating through the first relative position, the serpentine elastic member releases elastic force, providing a boosting force in the same direction as the opening and closing direction to push the flipping upper bracket to continue rotating in the same direction, driving the upper cover assembly to close or open to the maximum position; by changing the structural design of the flipping upper bracket and the flipping lower bracket, the opening and closing angle between the flipping upper bracket and the flipping lower bracket when the flipping mechanism is in the first relative position can be changed; this design realizes that there is a prominent first relative position during the opening and closing process of the charging box and is easy to adjust, which can meet the design requirements of different product opening and closing tactile feelings. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0028] Figure 1 This is an overall structural diagram of a flip-up bracket provided by this utility model;
[0029] Figure 2 An exploded view of a flip-up bracket provided by this utility model;
[0030] Figure 3 This is a schematic diagram of a specific embodiment of the serpentine elastic element of this utility model;
[0031] Figure 4 This is a side sectional view of a flip bracket in its closed state after assembly, provided by this utility model.
[0032] Figure 5 A side sectional view of a flip bracket provided by this utility model after assembly and opening to the first relative position;
[0033] Figure 6 A side sectional view of a flip bracket provided by this utility model when it is fully opened after assembly;
[0034] Figure 7 This is a schematic diagram of a specific embodiment of the serpentine elastic element of this utility model;
[0035] Figure 8 An exploded view of a specific embodiment of an earphone charging case provided by this utility model.
[0036] Explanation of icon numbers:
[0037] Flipping mechanism 1, upper cover assembly 2, lower cover assembly 3, flipping upper support 11, serpentine elastic element 12, flipping lower support 13, protruding structure 111, first rotating assembly 131, second rotating assembly 112, third rotating assembly 132, first rotating shaft 1311, first bushing 1312, second rotating shaft 1121, second bushing 1122, third rotating shaft 1321, third bushing 1322. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0039] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.
[0040] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.
[0041] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.
[0042] This utility model provides a flipping mechanism for an earphone case. The flipping mechanism is convenient to open and close, has a simple structure, occupies little space, and can effectively reduce production costs. Furthermore, by setting a protruding first relative position, it affects the force feedback changes during the opening and closing of the earphone case, thereby improving the feel of opening and closing the earphone case.
[0043] Figure 1 This is an overall structural diagram of a flip-up bracket provided by this utility model. Figure 2 This is an exploded view of a flip-up bracket provided by this utility model. Figure 1-2 As shown, the flipping mechanism 1 of this utility model includes an upper flipping bracket 11, a serpentine elastic element 12, and a lower flipping bracket 13. The upper flipping bracket 11 is fixedly connected to the upper cover assembly 2 of the earphone case, and the lower flipping bracket 13 is fixedly connected to the lower cover assembly 3 of the earphone case. The upper flipping bracket 11 and the lower flipping bracket 13 are rotatably connected, thereby realizing the opening or closing of the earphone case lid. The two ends of the serpentine elastic element 12 are rotatably connected to the upper flipping bracket 11 and the lower flipping bracket 13, respectively.
[0044] Specifically, in some embodiments of this utility model, a first rotating component 131 is provided at the rotatable connection between the upper flip-up bracket 11 and the lower flip-up bracket 13. The upper flip-up bracket 11 rotates around the lower flip-up bracket 13 via the first rotating component 131, thereby realizing the opening or closing of the flip-up bracket. A second rotating component 112 and a third rotating component 132 are also provided at the rotatable connection between the serpentine elastic member 12 and the upper flip-up bracket 11 and the lower flip-up bracket 13, respectively. The serpentine elastic member 12 rotates around the upper flip-up bracket 11 and the lower flip-up bracket 13 via the second rotating component 112 and the third rotating component 132.
[0045] Specifically, the shape and outline of the upper flip bracket 11 and the lower flip bracket 13 are designed according to the upper and lower cover assemblies 3 of the box body to which they are fixedly connected. The upper flip bracket 11 and the upper cover assembly 2 are fixed by dispensing glue or structural design, and the lower flip bracket 13 and the lower cover assembly 3 are also fixed by dispensing glue or structural design, so as to realize that the opening and closing of the flip mechanism 1 drives the overall opening and closing of the box body.
[0046] Specifically, such as Figure 1-2 In this embodiment, the first rotating component 131 uses a rotating structure, including a first bushing 1312 and a first rotating shaft 1311. The first bushing 1312 is disposed at the end of the lower rotating bracket 13 near the upper rotating bracket 11, and the first rotating shaft 1311 passes through the first bushing 1312 and is fixedly connected to the upper rotating bracket 11 at both ends. It should be noted that as long as the rotation effect can be achieved, the implementation method and connection position of the first rotating component 131 are not limited to the rotating structure in this embodiment.
[0047] Specifically, in some embodiments of this utility model, the inner side of the flip-up upper support 11 has a protruding structure 111, and the second rotating component 112 is connected to the protruding structure 111 and suspended on the side of the flip-up upper support 11 with the protruding structure 111. The protruding structure 111 serves to extend the flip-up upper support 11 and connect the serpentine elastic element 12, and is an adaptive structural design made according to product design needs. In this embodiment, the protruding structure 111 is designed as a fan-shaped support, and the arc surface of the fan-shaped support is connected to the inner wall of the flip-up upper support 11. The advantages of the fan-shaped support are its simple structure, reliable fixation, and small space occupation. It should be noted that the protruding structure 111 can also be designed in any shape, and its upper edge is designed according to the shape and contour of the inner wall of the flip-up upper support 11.
[0048] Specifically, such as Figure 1-2 In this embodiment, the second rotating assembly 112 uses a rotating structure, including a second bushing 1122 and a second rotating shaft 1121. The second bushing 1122 is disposed on the inner wall of the flip-up upper bracket 11, and the second rotating shaft 1121 passes through the second bushing 1122 and the end of the serpentine elastic member 12 near the flip-up upper bracket 11. Further, in this embodiment, the second bushing 1122 is configured as two parts, respectively placed on both sides of the fan-shaped bracket; one end of the serpentine elastic member 12 is provided with a shaft hole, which can be snapped into the middle of the second bushing 1122 and connected and fixed by the second rotating shaft 1121.
[0049] Specifically, such as Figure 1-2 In this embodiment, the third rotating component 132 uses a rotating structure, including a third bushing 1322 and a third rotating shaft 1321. The third bushing 1322 is disposed at the end of the lower rotating bracket 13 near the upper rotating bracket 11, and the third rotating shaft 1321 passes through the third bushing 1322 and the end of the serpentine elastic member 12 near the lower rotating bracket 13. It should be noted that, as long as the rotation effect can be achieved, the implementation method and connection position of the second rotating component 112 and the third rotating component 132 are not limited to the rotating structure in this embodiment.
[0050] Furthermore, in this embodiment, the third bushing 1322 is disposed on the outer wall of the first bushing 1312. This design can reduce the volume of the flipping mechanism 1 and effectively reduce its space occupation on the earphone case. It is a preferred design proposed according to product design needs.
[0051] Furthermore, in this embodiment, as Figure 1-2 The first bushing 1312, the second bushing 1122, and the third bushing 1322 are arranged in parallel, so that the rotation axes of the first rotating component 131, the second rotating component 112, and the third rotating component 132 are parallel to each other. It should be noted that this utility model does not limit the connection position of each bushing. As long as the function of each rotating component can be realized, the bushings are not necessarily limited to being arranged in parallel.
[0052] Specifically, the structure of the serpentine elastic element 12 can be designed to be formed by connecting at least one "S"-shaped folded structure. In this embodiment, as shown... Figure 3 As shown, the serpentine spring sheet is designed as two repeating "S"-shaped folded structures connected together, which is the preferred design considering both manufacturing cost and structural rigidity.
[0053] Specifically, the serpentine elastic element 12 can be designed as a serpentine elastic sheet or a serpentine spring wire. For example... Figure 3 As shown, in this embodiment, the serpentine elastic element 12 uses a serpentine spring sheet structure. Compared to springs of other shapes, the serpentine spring sheet can produce more uniform deformation under the same stress conditions, avoiding stress concentration and thus improving the service life of the spring and the flipping mechanism 1. In another embodiment, as... Figure 7 As shown, the serpentine elastic element 12 can use a serpentine spring wire, which can keep the shape unchanged, reduce product manufacturing costs, and optimize product design experience.
[0054] When the user opens the upper cover assembly 2, the upper flip support 11 rotates around the lower flip support 13, causing the upper cover assembly 2 to rotate around the rotation axis of the first rotating assembly 131. Simultaneously, during rotation, the serpentine elastic element 12 is first compressed by external force, providing the user with a damped opening feel. Then, when the three rotation axes of the first rotating assembly 131, the second rotating assembly 112, and the third rotating assembly 132 are coplanar, the compression of the serpentine elastic element 12 reaches its maximum value, possessing the greatest elastic potential energy. At this point, the flipping mechanism 1 is in the first relative position, such as... Figure 5 As shown by the dashed line.
[0055] The first relative position is the relative opening / closing position of the upper flip bracket 11, the lower flip bracket 13, and the serpentine elastic element 12 when the serpentine elastic element 12 does not provide rotational torque to the upper and lower flip brackets. After passing the first relative position, the user can remove the external force. At this time, the serpentine elastic element 12 will release its elasticity, pushing the upper flip bracket 11 to continue rotating in the same direction, causing the upper cover assembly 2 to automatically flip outward to the maximum open position or close inward. In general, with the first relative position as the critical point, during the user's opening process, they will first experience the damping sensation brought by the compression of the serpentine elastic element 12, and then experience the assist sensation provided by the release of the serpentine elastic element 12. This change in force feedback improves the user experience of the earphone case opening and closing process. It should be noted that there is only one first relative position in this embodiment, but it does not necessarily limit the number of first relative positions in other embodiments of this utility model.
[0056] The present utility model can adjust the opening and closing angle of the flipping mechanism 1 when it is in the first relative position by changing the structural design of the flipping upper bracket 11 and the flipping lower bracket 13, or by changing the combined design of the serpentine elastic member 12 and the first rotating assembly 131, the second rotating assembly 112, and the third rotating assembly 132. For example, by adjusting the suspension height of the second rotating assembly 112 or changing the connection and fixing position of the third rotating assembly 132 on the first rotating assembly 131, the suspension angle of the serpentine elastic member 12 can be changed, and further the inclination angle of the serpentine elastic member 12 when it reaches the first relative position can be changed, so as to realize the adjustment of the opening and closing angle of the flipping mechanism 1 when it is in the first relative position. By adjusting the above-mentioned opening and closing angle, the magnitude and change mode of the damping feeling felt by the user during the process of opening and closing the earphone case can be changed, which can effectively meet the design requirements of the differential product opening and closing hand feeling.
[0057] Specifically, as Figure 3-6 shown, this embodiment describes the relative position and length change relationship of the serpentine elastic member 12 during the opening and closing process of the box body from the side. First, in the natural state, the length of the serpentine elastic member 12 is L0;
[0058] Furthermore, as Figure 4 shown, when the flipping assembly is in the closed state after the serpentine elastic member 12 is assembled, the length of the serpentine elastic member 12 is L1. At this time, it is in the compressed state or the free state, satisfying L1≤L0. At this time, the elastic force of the elastic member provides a rotational torque for the flipping upper bracket 11 around the first rotating assembly 131 in the direction of the cover body closing, so that the upper cover assembly 2 and the lower cover assembly 3 are tightly closed, ensuring the stability of the box cover closing. Compared with the existing charging box flip structure that uses magnets or buckles to ensure the stability when the box body is closed, the flipping mechanism 1 using the serpentine elastic member 12 is convenient in the opening and closing process, has a simple structure, occupies a small space, and can effectively reduce the production cost.
[0059] Furthermore, as Figure 5 shown, it shows that when the box cover is opened and closed to the flipping mechanism 1 being in the first relative position, the serpentine elastic member 12 is compressed to the shortest, and the length at this time is L2, satisfying L2<L0. After the opening of the cover passes through this first relative position, the elastic torque of the serpentine elastic member 12 acting on the flipping upper bracket 11 will change from the direction of hindering the opening / closing of the cover to the direction of assisting the opening / closing of the cover. The user does not need to continue exerting force, and the upper cover assembly 2 will be opened to the maximum position or closed under the action of the elastic force release of the serpentine elastic member 12.
[0060] Furthermore, as Figure 6, the flipping component is in the maximum open state, which is generally restricted by the limiting structure formed in the structural design of the upper cover component 2 and the lower cover component 3. At this time, the length of the serpentine elastic member 12 is L3, satisfying L3 ≤ L0, and the elastic member is in a compressed state or a free state. At this time, the elastic force of the spring provides a rotational torque for the flipping upper bracket 11 around the first rotating shaft 1311 in the direction of the cover opening, so that the upper cover component 2 and the lower cover component 3 are maintained at the maximum open position, ensuring the stability of the opening of the box body. Compared with the existing solution that uses magnets and torsion springs to keep the charging box closed and opened, this embodiment only uses one component, the serpentine elastic member 12, to achieve the retention of the closed and open states of the box body, simplifies the structure, reduces the cost, and saves the internal space of the box body at the same time.
[0061] Generally speaking, in some embodiments of the present utility model, during the opening and closing process of the flipping mechanism 1, the length change of the serpentine elastic member 12 satisfies L2 < L1 ≤ L0 and L2 < L3 ≤ L0. Among them, the size relationship between L1 and L3 affects the difference in the feel between the opening and closing actions of the earphone box lid, which can be adjusted according to the product design requirements, and the present utility model does not make specific limitations.
[0062] The present utility model also provides an earphone charging box, including any one of the above flipping mechanisms, which can be used for the storage and / or charging of true wireless earphones, fully open wearable earphones, and bone conduction earphones.
[0063] In one embodiment, as Figure 8 shown, the box body includes an upper cover component 2, a lower cover component 3, and a flipping mechanism 1. The flipping mechanism 1 is located at the connection between the upper and lower covers, is respectively connected to the upper and lower covers, and drives the upper cover component 2 to rotate and open and close around the lower cover component 3. The flipping mechanism 1 can be embedded in the surface of the connection between the upper cover component 2 and the lower cover component 3, or can be completely hidden inside the box body, and its specific connection relationship is determined according to the product design requirements.
[0064] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.
[0065] The above has introduced the earphone charging box provided by the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.
Claims
1. A flipping mechanism for an earphone case, the flipping mechanism being used to open and close the upper cover assembly and the lower cover assembly of an earphone case, characterized in that, The flipping mechanism includes: An upper flipping bracket, which is fixedly connected to the upper cover assembly; A lower flipping bracket, which is fixedly connected to the lower cover assembly, and the upper flipping bracket is rotatably connected to the lower flipping bracket, so as to realize the opening and closing of the earphone box lid; A serpentine elastic member, and both ends of the serpentine elastic member are respectively rotatably connected to the upper flipping bracket and the lower flipping bracket; During the rotation of the upper flipping bracket around the lower flipping bracket, there is a first relative position among the upper flipping bracket, the lower flipping bracket and the serpentine elastic member; when the upper flipping bracket rotates towards the first relative position, the serpentine elastic member is compressed by force; when in the first relative position, the compression amount of the serpentine elastic member reaches the maximum value; after passing through the first relative position, the serpentine elastic member releases elastic force to push the upper flipping bracket to continue rotating in the same direction, driving the upper cover assembly to close or open to the maximum position.
2. The box-flipping mechanism according to claim 1, characterized in that, A first rotating component is arranged at the rotation connection between the upper flipping bracket and the lower flipping bracket, and the upper flipping bracket rotates around the lower flipping bracket through the first rotating component; Second rotating components and third rotating components are respectively arranged at the rotation connections between the serpentine elastic member and the upper flipping bracket and the lower flipping bracket, and the serpentine elastic member rotates around the upper flipping bracket and the lower flipping bracket through the second rotating component and the third rotating component.
3. The box-flipping mechanism according to claim 2, characterized in that, The first rotating component includes a first shaft sleeve and a first rotating shaft, the first shaft sleeve is arranged at the end of the lower flipping bracket close to the upper flipping bracket, the first rotating shaft passes through the first shaft sleeve, and both ends are fixedly connected to the upper flipping bracket; The second rotating component includes a second shaft sleeve and a second rotating shaft, the second shaft sleeve is arranged on the inner wall of the upper flipping bracket, and the second rotating shaft passes through the second shaft sleeve and the end of the serpentine elastic member close to the upper flipping bracket; The third rotating component includes a third shaft sleeve and a third rotating shaft, the third shaft sleeve is arranged at the end of the lower flipping bracket close to the upper flipping bracket, and the third rotating shaft passes through the third shaft sleeve and the end of the serpentine elastic member close to the lower flipping bracket.
4. The box-flipping mechanism according to claim 3, characterized in that, The third shaft sleeve is arranged on the first shaft sleeve.
5. The box-flipping mechanism according to claim 2, characterized in that, The first relative position is unique, and the first relative position is the relative position of the upper flipping bracket, the lower flipping bracket and the serpentine elastic member when the rotation axes of the first rotating component, the second rotating component and the third rotating component are in the same plane.
6. The box-flipping mechanism according to claim 2, characterized in that, There is a convex structure inside the upper flipping bracket, and the second rotating component is connected to the convex structure and is suspended on one side of the upper flipping bracket with the convex structure.
7. The box-flipping mechanism according to claim 1, characterized in that, The free state length of the serpentine elastic member is L0, the length in the closed state of the box body is L1, the length when the compression amount reaches the maximum value is L2, and the length when the box body is opened to the maximum position is L3, satisfying L2 < L1 ≤ L0 and / or L2 < L3 ≤ L0.
8. The box-flipping mechanism according to claim 1, characterized in that, The serpentine elastic member is composed of at least one section of "S" - shaped folding structure connected.
9. The box-flipping mechanism according to claim 1, characterized in that, The serpentine elastic member is a serpentine spring sheet or a serpentine spring wire.
10. A charging case, characterized in that, The charging case includes the case-flipping mechanism described in any one of claims 1-9, and can be used for the storage and / or charging of true wireless earbuds, fully open wearable earbuds, and bone conduction earbuds.