A bistable hinge for a headphone charging case and a headphone charging case

Abstract

The embodiment of the present application provides a bistable hinge for an earphone charging box and an earphone charging box, the bistable hinge includes a mounting seat, an adapter and an elastic member; the adapter is rotatably connected to the mounting seat, the adapter has a rotation axis, the adapter has a first stable position, a critical position and a second stable position, and the critical position is located between the first stable position and the second stable position; the elastic member is loaded between the mounting seat and the adapter, when the adapter is in the critical position, the torque applied by the elastic member to the adapter is zero; when the adapter deviates to either side of the critical position along the rotation direction, the elastic member applies a driving torque to the adapter to drive the adapter to move to the first stable position or the second stable position. The bistable hinge of the embodiment of the present application has the function of automatic closing and automatic opening within a certain rotation range, and both the closing process and the opening process have a damping feel, which is conducive to improving the user experience.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a bistable hinge for an earphone charging box and an earphone charging box. Background Art

[0002] The earphone charging box is a device that can both charge and store earphones. Specifically, when the earphones are not needed, the earphones are placed in the earphone charging box for storage and charging, which is convenient for carrying. In the related art, the earphone charging box uses magnets to keep the box body and the box cover in a closed state. When the box cover is opened, due to the magnetic force, the box cover tends to close and cannot be kept in an open state. At this time, the user needs to manually stabilize the box cover, or set other latch structures on the earphone charging box. Summary of the invention

[0003] In view of this, the embodiments of the present application hope to provide a bistable hinge for an earphone charging box and an earphone charging box having automatic opening and automatic closing functions within a certain range.

[0004] To achieve the above-mentioned purpose, an embodiment of the present application provides a bistable hinge for an earphone charging box, the bistable hinge comprising a mounting seat, an adapter and an elastic member; the adapter is rotatably connected to the mounting seat, the adapter has a rotation axis, the adapter has a first stable position, a critical position and a second stable position, the critical position is located between the first stable position and the second stable position; the elastic member is loaded between the mounting seat and the adapter, when the adapter is in the critical position, the torque applied by the elastic member to the adapter is zero; when the adapter deviates to either side of the critical position along the rotation direction, the elastic member applies a driving torque to the adapter to drive the adapter to move to the first stable position or the second stable position.

[0005] In some embodiments, the elastic member includes at least one torsion spring, and the torsion spring includes a first leg, a second leg and a spiral body, the first leg is connected to the mounting seat, and the second leg is connected to the adapter; the angle between the axis of the spiral body and the rotation axis is in the range of 45° to 90°.

[0006] In some embodiments, the axis of the helix is ​​perpendicular to the rotation axis; the critical position is located at 1 / 2 of the rotation stroke between the first stable position and the second stable position; at the critical position, the pitch of the helix is ​​maximum.

[0007] In some embodiments, the number of the torsion springs is two, the ends of the first legs of the two torsion springs are fixedly connected, and the axes of the spiral bodies of the two torsion springs are parallel.

[0008] In some embodiments, two insertion holes are provided on opposite sides of the adapter along the direction of the rotation axis, and the end of the second leg of one of the torsion springs is inserted into one of the insertion holes, and the end of the second leg of the other torsion spring is inserted into the other insertion hole.

[0009] In some embodiments, the two insertion holes are coaxial and the axis is parallel to the rotation axis.

[0010] In some embodiments, the bistable hinge includes a rotating shaft. A first shaft hole is provided on the adapter. The mounting seat includes a bottom plate and two columns located at opposite ends of the bottom plate. A second shaft hole is provided on the column, and the rotating shaft passes through the first shaft hole and the second shaft hole.

[0011] In some embodiments, a recessed area is formed on the top surface of the bottom plate. The mounting seat includes a retaining piece located on the top side of the recessed area. The retaining piece and the surface of the recessed area jointly define a limiting groove, and the first leg of the torsion spring is movably arranged in the limiting groove.

[0012] In some embodiments, the mounting seat includes a first limiting plate provided at the top ends of the two columns and a second limiting plate connected between the two columns; along the height direction of the column, the second limiting plate is located between the first limiting plate and the bottom plate, and the rotating shaft is located between the first limiting plate and the second limiting plate; in the plane projection perpendicular to the height direction of the column, the first limiting plate and the second limiting plate define a rotation space, and a part of the structure of the adapter is located in the rotation space. The first limiting plate and the second limiting plate jointly define the first stable position and the second stable position of the adapter.

[0013] In some embodiments, the adapter includes a first sub-plate and a second sub-plate. The first shaft hole penetrates through the first sub-plate. The second sub-plate is located on one side of the first sub-plate. The insertion hole is provided on the second sub-plate, and the dimension of the second sub-plate along the rotation axis direction is smaller than the dimension of the first sub-plate.

[0014] In some embodiments, an avoidance notch is formed at the edge of the first limiting plate, and an avoidance groove is provided at the position where the second limiting plate is used to contact the second sub-plate; when the adapter is in the first stable position, a part of the structure of the second sub-plate is located in the avoidance groove and is in stop contact with the second limiting plate, and at least a part of the structure of the first sub-plate is caught in the avoidance notch.

[0015] In some embodiments, the adapter further includes a shielding plate, the first sub-plate is disposed on the surface of the shielding plate, and the rotating shaft is located on the side of the shielding plate facing the first sub-plate. When the adapter is in the first stable position, the shielding plate covers the space jointly defined by the two columns, the first limiting plate, and the second limiting plate.

[0016] In some embodiments, the mounting seat is an integrally formed structure; and / or, the adapter is an integrally formed structure.

[0017] In some embodiments, the rotation angle corresponding between the first stable position and the second stable position is 80° - 100°.

[0018] The embodiment of the present application further provides a headphone charging case, which includes a case cover, a case body, and the bistable hinge as described in any one of the above. The case cover is fixedly connected to the adapter; the case body is used to accommodate the headphones and charge the headphones; the mounting seat is fixedly disposed in the case body; the adapter drives the case cover to switch between the open state and the closed state of closing the case body. When the adapter is in the first stable position, the case cover is in the closed state, and when the adapter is in the second stable position, the case cover is in the open state.

[0019] Taking the example that the adapter of the bistable hinge in the embodiment of the present application needs to switch from the first stable position to the second stable position, the user can slowly rotate the adapter. At this time, the force applied by the user needs to be able to overcome the resistance generated by the first torque W1. As long as the rotation angle of the adapter can make the adapter cross the critical position, after crossing the critical position, the elastic member applies a reverse second torque W2 to the adapter. The direction of this second torque is the same as the rotation direction, and the second torque is the driving torque. At this time, even if the user can let go, the adapter can automatically rotate under the action of the elastic member until it reaches the second stable position, and is stably maintained at the second stable position under the action of the second torque W2. The bistable hinge in the embodiment of the present application has the functions of automatic closing and automatic opening within a certain rotation range, and both the closing process and the opening process have a damping feel, which is beneficial to improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a bistable hinge according to an embodiment of the present application;

[0021] Figure 2 is Figure 1 an exploded schematic diagram of the structure shown;

[0022] Figure 3 is a schematic structural diagram of an elastic member according to an embodiment of the present application;

[0023] Figure 4Structural schematic diagram of the mounting base according to an embodiment of the present application;

[0024] Figure 5 is Figure 4 Schematic diagram of another perspective of the structure shown;

[0025] Figure 6 is Figure 5 Schematic diagram of another perspective of the structure shown;

[0026] Figure 7 is Figure 6 Schematic diagram of another perspective of the structure shown;

[0027] Figure 8 Schematic diagram of the mechanical principle of the bistable hinge according to an embodiment of the present application, wherein the adapter is in the first stable position;

[0028] Figure 9 is Figure 8 Schematic diagram of the mechanical principle of the structure in another state shown, wherein the adapter is in the second stable position;

[0029] Figure 10 Structural schematic diagram of the earphone charging case according to an embodiment of the present application, wherein the case cover is in the closed state;

[0030] Figure 11 is Figure 10 Structural schematic diagram of the earphone charging case in another state shown, wherein the case cover is in the open state;

[0031] Figure 12 is Figure 11 Explosion schematic diagram of the structure shown;

[0032] Figure 13 is Figure 11 Schematic diagram of the structure shown after omitting the storage cover plate;

[0033] Figure 14 Structural schematic diagram of the box body according to an embodiment of the present application;

[0034] Figure 15 is Figure 10 Cross-sectional view of the structure shown;

[0035] Figure 16 is Figure 15 Schematic diagram of the structure in another state shown, wherein the case cover is in the open state.

[0036] Explanation of reference numerals

[0037] Box body 1; Insertion slot 10a; Storage cover plate 12; Storage slot 12a; First rib 131; Second rib 132; Lid 2; Bistable hinge 3; Adapter 31; Insertion hole 31a; First shaft hole 31b; First sub-plate 312; Second sub-plate 313; Shielding plate 314; Arc-shaped groove 314a; Mounting seat 32; Bottom plate 320; Depression area 320a; Column 321; Second shaft hole 321a; First limiting plate 322; Avoidance notch 322a, Second limiting plate 323; Avoidance groove 323a; Rotation space 32a; Flap 324; Limiting groove 324a; Elastic member 33; Torsion spring 33'; Helix 331; First leg 332; Second leg 333; Rotating shaft 34 Detailed implementation manner

[0038] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. The detailed description in the specific implementation manner should be understood as an explanatory description of the purpose of the present application and should not be regarded as an improper limitation of the present application.

[0039] In the description of the embodiments of the present application, "top", "bottom", orientation or positional relationship is based on the orientation or positional relationship shown in the attached Figure 15 Specifically, Figure 15 the upper part in

[0040] is "top", and the lower part is "bottom". It should be understood that these orientation terms are only for the convenience of describing the present application 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 should not be construed as a limitation of the present application.

[0041] The embodiments of the present application provide a bistable hinge for a headphone charging case and a headphone charging case.

[0042] Please refer to Figures 10 to 12 for details. The headphone charging case includes a lid 2, a box body 1, and the bistable hinge 3 of the embodiments of the present application. The lid 2 and the box body 1 are rotationally connected through the bistable hinge 3.

[0043] The bistable state in the embodiments of the present application means that during the rotation process, it includes at least two stable states. In the stable state, even after the external force is withdrawn, it can reliably remain in the current stable state.

[0044] Please refer to Figure 1 and Figure 2 , the bistable hinge 3 includes a mounting seat 32, a transfer member 31 and an elastic member 33. The transfer member 31 has a rotation axis (simplified as Figure 8 and Figure 9 the O point in Figure 1 and Figure 15 ), the transfer member 31 has a first stable state position (refer to Figure 16 ), a critical position and a second stable state position (refer to

[0045] ). The critical position is located between the first stable state position and the second stable state position, and the transfer member 31 switches between the first stable state position and the second stable state position. The elastic member 33 is loaded between the mounting seat 32 and the transfer member 31. That is to say, for the elastic member 33, both the mounting seat 32 and the transfer member 31 are loads of the elastic member 33.

[0046] It should be noted that the statement "when the transfer member 31 deviates from the critical position to any side along the rotation direction, the elastic member 33 applies a driving moment to the transfer member 31 to drive the transfer member 31 to move to the first stable state position or the second stable state position" includes the following two situations. The first one: when the transfer member 31 deviates from the critical position and is located on the first side along the rotation direction of the critical position, the elastic member 33 drives the transfer member 31 to move to the first stable state position. The second one: when the transfer member 31 deviates from the critical position and is located on the second side along the rotation direction of the critical position, the elastic member 33 drives the transfer member 31 to move to the second stable state position.

[0047] Specifically, please refer to Figure 8 , the elastic member 33 applies a force F1 to the transfer member 31, and the force F1 generates a first moment W1 about the rotation axis (simplified as Figure 8 the O point in

[0048] Please refer to Figure 9 , the elastic member 33 applies a force F2 to the transfer member 31, and the force F2 generates a first moment W1 about the rotation axis (simplified as Figure 9The second moment W2 (at point O therein), and the second moment W2 is the aforementioned driving moment, where the first moment W1 and the second moment W2 are in opposite directions. The adapter 31 moves to the second stable position under the action of the second moment W2 and remains at the current second stable position. That is to say, in the absence of an external force or when the action of the external force on the adapter 31 is not sufficient to overcome the resistance formed by the second moment W2, the adapter 31 will not deviate from the current second stable position.

[0049] When the adapter 31 needs to be switched from the first stable position to the second stable position, the user can slowly rotate the adapter 31. At this time, the force applied by the user needs to be able to overcome the resistance generated by the first moment W1. That is to say, the first moment W1 is the resistance moment at this time. When the rotation angle of the adapter 31 can make the adapter 31 cross the above critical position, the elastic member 33 applies a reverse second moment W2 to the adapter 31. The direction of the second moment W2 is the same as the rotation direction. At this time, the second moment W2 is the driving moment. Even if the user releases the hand, the adapter 31 can automatically rotate under the action of the elastic member 33 until it reaches the second stable position and stably remains at the second stable position under the action of the second moment W2.

[0050] When the adapter 31 needs to be switched from the second stable position to the first stable position, the user can slowly rotate the adapter 31 in the opposite direction. At this time, the force applied by the user needs to be able to overcome the resistance generated by the second moment W2. That is to say, the second moment W2 is the resistance moment at this time. When the rotation angle of the adapter 31 can make the adapter 31 cross the above critical position, the elastic member 33 applies a reverse first moment W1 to the adapter 31. Even if the user releases the hand, the adapter 31 can automatically continue to rotate to the first stable position under the action of the elastic member 33 and stably remains at the first stable position under the action of the first moment W1.

[0051] That is to say, the bistable hinge in the embodiment of the present application has the functions of automatic closing and automatic opening within a certain rotation range, and both the closing process and the opening process have a damping feel, which is beneficial to improving the user experience.

[0052] Exemplarily, the above mounting seat 32 is fixedly arranged in the box body 1. Specifically, a plug-in groove 10a is arranged on the inner side of the box body 1, and a part of the structure of the mounting seat 32 can be inserted into the plug-in groove 10a from the open part of the box body 1 and fixed in the plug-in groove 10a; the adapter 31 is fixedly connected to the box cover 2, and the adapter 31 drives the box cover 2 to switch between the open state and the closed state of covering the box body 1. Please refer to Figure 15 When the adapter 31 is in the first stable position, the box cover 2 is in the closed state. Please refer to Figure 16 When the adapter 31 is in the second stable position, the box cover 2 is in the open state.

[0053] The specific type of the elastic member 33 is not limited. For example, in one embodiment, please refer to Figure 2 , the elastic member 33 includes at least one torsion spring 33'. Specifically, please refer to Figure 3 , the torsion spring 33' includes a helix 331, a first leg 332 and a second leg 333. The first leg 332 and the second leg 333 are connected to opposite ends of the helix 331 along the axis. The first leg 332 of the torsion spring 33' is connected to the mounting seat 32, and the second leg 333 of the torsion spring 33' is connected to the adapter 31 to drive the adapter 31 to rotate in both forward and reverse directions around the rotation axis. That is to say, the second leg 333 of the torsion spring 33' can drive the adapter 31 to rotate forward around the rotation axis and can also drive the adapter 31 to rotate backward around the rotation axis. The helix 331 is suspended, that is to say, the helix 331 will move along with the second leg 333.

[0054] It should be noted that the forward and reverse directions refer to two directions around the rotation axis. For example, the clockwise direction of Figure 8 can be named as the positive direction, and the counterclockwise direction of Figure 8 can be named as the reverse direction. Or the clockwise direction of Figure 8 can be named as the reverse direction, and the counterclockwise direction of Figure 8 can be named as the positive direction.

[0055] It can be understood that the torsion spring 33' can form the above-mentioned first moment W1 in a compressed state, or can also form the above-mentioned first moment W1 in a stretched state. Similarly, the torsion spring 33' can form the above-mentioned second moment W2 in a compressed state, or can also form the above-mentioned second moment W2 in a stretched state. There is no limitation here.

[0056] The arrangement mode of the helix 331 of the above torsion spring 33' is not limited. For example, in one embodiment, the axis of the helix 331 can be parallel to the rotation axis.

[0057] In one embodiment, please refer to Figure 2 , the included angle range between the axis of the helix 331 and the rotation axis is 45° to 90°. In this way, the space occupied by the torsion spring 33' along the direction perpendicular to the rotation axis can be reduced, making the structure of the bistable hinge compact.

[0058] When the adapter 31 rotates, the distance between the end of the first leg 332 and the end of the second leg 333 changes, which causes the pitch of the helicoid 331 to change. That is to say, the helicoid 331 generates an axial elastic deformation. Therefore, the helicoid 331 has an axial resilience. This resilience acts on the adapter 31 to form the above-mentioned acting forces F1 and F2. Since the above-mentioned acting forces F1 and F2 are generally along the axis of the helicoid 331 and the acting force directions are relatively determined, during the design process of the torsion spring, it is convenient to design the diameter, material, pitch size, etc. of the helicoid 331.

[0059] In one embodiment, the axis of the helicoid 331 is perpendicular to the rotation axis. That is to say, the included angle between the axis of the helicoid 331 and the rotation axis is 90°.

[0060] It can be understood that in the embodiment where the axis of the helicoid is parallel to the rotation axis, since the acting force of the first leg is formed by the resilience of the first leg, as the deformation degree of the torsion spring is different and the attitude of the first leg is different, the acting force direction of the first leg is uncertain, resulting in an extremely complex design process of the torsion spring.

[0061] In the embodiment where the axis of the helicoid 331 is perpendicular to the rotation axis, since the torsion spring 33′ relies on the acting force formed by the axial elastic deformation of the helicoid 331, even if the maximum distance between the end of the first leg 332 and the end of the second leg 333 is designed to be relatively small, the torsion spring 33′ can still apply a large elastic force to the adapter 31. Therefore, the size of the torsion spring in the height direction (up and down direction) and the width direction (left and right direction) is relatively small, so that the bistable hinge structure can be made compact. Figure 15 In the case where the mounting seat 32 is arranged on the box body 1 of the earphone charging box, since the box body 1 not only needs to accommodate the earphone, but also is provided with a power supply, a circuit board, charging contacts, etc., there are many parts in the box body 1, making the space for accommodating the mounting seat 32 in the box body 1 relatively narrow. However, the bistable hinge structure of the embodiment of the present application can be applied to the narrow space in the box body 1 of the earphone charging box.

[0062] Taking the adapter 31 switching from the first stable position to the second stable position as an example. During the process of the adapter 31 switching from the first stable position to the second stable position, the distance between the end of the first leg 332 and the end of the second leg 333 first gradually decreases and then gradually increases, and the pitch of the helicoid 331 first gradually increases and then gradually decreases.

[0063]

[0064] ​In one embodiment, at the midpoint of the rotational travel between the first stable position and the second stable position of the critical position, at the critical position, the pitch of the helix is the largest, and the distance between the end of the first leg 332 and the end of the second leg 333 is the smallest. At the critical position, the elastic potential energy of the torsion spring 33' is greater than that at other positions. Whether the adapter 31 rotates forward or backward, as long as the user moves the adapter 31 past this critical position, the torsion spring 33' can drive the adapter 31 to continue rotating with a large elastic potential energy.

[0065] It can be understood that the number of torsion springs 33' can be one or more, where "more than one" means not less than two. It should be noted that in embodiments with multiple torsion springs 33', the multiple torsion springs 33' can be spaced apart from each other without interference, or they can be connected to each other.

[0066] It should be noted that in an embodiment with only one torsion spring 33', both the above-mentioned first leg 332 and second leg 333 will form component forces along the direction of the rotation axis, and the directions of the two component forces are the same. This component force will force the adapter 31 to move axially along the rotation axis, giving the user a feeling of shaking and instability. Therefore, in the embodiments of the present application, please refer to Figure 3 Figure, the number of torsion springs 33' is two. The ends of the first legs of the two torsion springs 33' are fixedly connected, and the axes of the two torsion springs are parallel. That is to say, the two torsion springs 33' form a double torsion spring structure. On the one hand, the double torsion spring has high structural strength, large torsion, good stability, is not easily deformed under large forces, has a long service life, and can improve the reliability and durability of the bistable hinge.

[0067] On the other hand, the component forces of the two torsion springs 33' in the direction along the rotation axis are opposite and can cancel each other out. Therefore, the adapter 31 can be centered at the middle position along the rotation axis. Specifically, due to manufacturing errors, assembly errors, etc., there will be a certain axial clearance between the adapter 31 and the mounting seat 32 along the rotation axis. This axial clearance should not only ensure the normal assembly of the adapter 31 and the mounting seat 32, but also prevent large dry friction from occurring between the adapter 31 and the mounting seat 32. Due to the existence of this axial clearance, there is a possibility that the adapter 31 has axial movement. Under the action of the above two torsion springs 33', when the adapter 31 is at the middle position, the axial forces of the two torsion springs 33' are balanced. When the adapter 31 moves a little displacement to the left along Figure 3 the right torsion spring 33' will force the adapter 31 to move to the right. When the adapter 31 moves along Figure 3When there is a little displacement to the right of , the torsion spring on the left will force the adapter 31 to move to the left. This process repeats, and the adapter 31 is stably positioned at the middle equilibrium position. Thus, even if there are relatively large axial clearances on both axial sides of the adapter 31, the adapter 31 will not axially move around, which can reduce the manufacturing precision and assembly precision requirements for the adapter 31 and the mounting base 32, and is conducive to reducing production costs.

[0068] Specifically, in a specific embodiment of the present application, please refer back to Figure 3 , both the first leg 332 and the second leg 333 are bent structures, and the two torsion springs 33' approximately form a regular hexagon structure.

[0069] In one embodiment, the rotation angle corresponding between the second stable position and the first stable position is 80° - 100°. For example, 80°, 90°, 100°, etc.

[0070] In one embodiment, please refer to Figure 2 , two insertion holes 31a are provided on the opposite sides of the adapter 31 along the rotation axis direction. The end of the second leg 333 of one torsion spring 33' is inserted into one of the insertion holes 31a, and the end of the second leg 333 of the other torsion spring 33' is inserted into the other insertion hole 31a. During the rotation of the adapter 31 around the rotation axis, the end of the second leg 333 of the torsion spring 33' can rotate within the insertion hole 31a to improve the force condition of the torsion spring 33' itself.

[0071] In one embodiment, the two insertion holes 31a are coaxial and parallel to the rotation axis. That is to say, the two insertion holes 31a are located on the same straight line.

[0072] The rotational connection structure between the adapter 31 and the mounting base 32 is not limited. For example, in some embodiments, please refer to Figure 2 , the bistable hinge includes a rotating shaft 34, and the adapter 31 and the mounting base 32 are rotationally connected through the rotating shaft 34. Please refer to Figure 4 and Figure 5 , the mounting base 32 includes a bottom plate 320 and two columns 321 located at opposite ends of the bottom plate 320. Please refer to Figure 1 in combination, a partial structure of the adapter 31 is located between the two columns 321. A second shaft hole 321a is provided on the column 321, and a first shaft hole is provided on the adapter 31. The rotating shaft 34 passes through the first shaft hole and the second shaft hole 321a.

[0073] Please continue to refer to Figure 4 , in one embodiment, the mounting base 32 includes a first limiting plate 322 provided at the top ends of the two columns 321 and a second limiting plate 323 connected between the two columns 321. Please refer to Figure 5, along the height direction of the column 321, the second limiting plate 323 is located between the first limiting plate 322 and the bottom plate 320, and the rotating shaft 34 is located between the first limiting plate 322 and the second limiting plate 323. Please refer to Figure 7 , in the plane projection perpendicular to the height direction of the column 321, the first limiting plate 322 and the second limiting plate 323 jointly define a rotating space 32a, a partial structure of the adapter 31 is located in the rotating space 32a, and the first limiting plate 322 and the second limiting plate 323 jointly define the first stable position and the second stable position of the adapter 31.

[0074] The specific structure of the adapter 31 is not limited. For example, in one embodiment, please refer to Figure 2 , the adapter 31 includes a first sub-plate 312 and a second sub-plate 313. The second sub-plate 313 is located on one side of the first sub-plate 312 perpendicular to the rotation axis. The first shaft hole 31b penetrates through the first sub-plate 312, and the insertion hole 31a is arranged on the second sub-plate 313. The dimension of the second sub-plate 313 in the direction of the rotation axis is smaller than that of the first sub-plate 312. In this way, the distance between the ends of the second legs 333 of the two torsion springs 33' can be made smaller, which is convenient for the installation of the torsion springs 33'.

[0075] In one embodiment, please refer to Figure 5 and Figure 6 , a recessed area 320a is formed on the top surface of the bottom plate 320. The mounting base 32 includes a retaining piece 324 located on the top side of the recessed area 320a. The retaining piece 324 and the surface of the recessed area 320a jointly define a limiting groove 324a. Please refer to Figure 15 and Figure 16 , the first leg 332 of the torsion spring 33' is movably arranged in the limiting groove 324a. That is to say, in this embodiment, during assembly, only the first leg 332 of the torsion spring 33' needs to be snapped into the limiting groove 324a, and the retaining piece 324 can prevent the first leg 332 from detaching from the top side of the recessed area 320a of the bottom plate 320.

[0076] In one embodiment, please refer to Figure 5 , an avoidance notch 322a is formed at the edge of the first limiting plate 322. When the adapter 31 is in the first stable position, at least a part of the structure of the first sub-plate 312 is snapped into the avoidance notch 322a, and the second sub-plate 313 is in abutting contact with the second limiting plate 323. That is to say, the adapter 31 abuts against the second limiting plate 323 through the second sub-plate 313. This avoidance notch 322a provides an avoidance space for the first sub-plate 312, avoiding interference between the first sub-plate 312 and the first limiting plate 322 during rotation, so that the adapter 31 can have a larger rotation amplitude.

[0077] In one embodiment, please refer to Figure 4 and Figure 7, an avoidance groove 323a is provided at the position where the second limiting plate 323 is used to contact the second sub-plate 313. When the adapter 31 is in the first stable position, a part of the structure of the second sub-plate 313 is located in the avoidance groove 323a and is in stop contact with the second limiting plate 323. This avoidance groove 323a can enable the first limiting plate 322 and the second limiting plate 323 to have a smaller spacing in the direction perpendicular to the height of the upright column 311, making the structure of the bistable hinge compact. At the same time, it can also enable the adapter 31 to have a larger rotation amplitude.

[0078] In one embodiment, please continue to refer to Figure 2 , the adapter 31 further includes a shielding plate 314, and the second sub-plate 313 is disposed on the surface of the shielding plate 314. When the adapter 31 is in the first stable position, the shielding plate 314 covers the space jointly defined by the two upright columns 311, the first limiting plate 322, and the second limiting plate 323. The shielding plate 314 can shield the rotating shaft 34 so that the user can never observe the rotating shaft 34 from the side of the shielding plate 314 facing away from the rotating shaft 34. In addition, when the adapter 31 is in the first stable position, the shielding plate 314 can also cover structures such as the mounting base 32 and the torsion spring 33', so that the user cannot see some of the mounting structures from the side of the shielding plate 314 facing away from the rotating shaft 34, improving the aesthetic appearance of the bistable hinge structure.

[0079] In one embodiment, please continue to refer to Figure 2 , an arc-shaped groove 314a is provided on the surface of the shielding plate 314. The arc-shaped groove 314a extends along the axial direction of the rotating shaft 34, and a part of the rotating shaft 34 is located in the arc-shaped groove 314a. The arc-shaped groove 314a can reduce the distance between the surface of the shielding plate 314 facing away from the rotating shaft 34 and the rotation axis of the rotating shaft 34, making the structure of the bistable hinge more compact. In addition, during the rotation of the adapter 31, the cooperation between the arc-shaped groove 314a and the rotating shaft 34 can also play a role in guiding the rotation, making the rotation process of the adapter 31 smoother.

[0080] It can be understood that the above-mentioned mounting base 32 can be an integrally formed structure or a split structure, which is not limited herein.

[0081] The above-mentioned adapter 31 can be an integrally formed structure or a split structure, which is not limited herein.

[0082] In order to facilitate the fixed insertion of the mounting base 32 into the insertion slot 10a, in one embodiment, please refer to Figure 14 , the earphone charging case includes a storage cover plate 12. The storage cover plate 12 is formed with a storage groove 12a for accommodating the earphone. The storage cover plate 12 is pressed against the side of the mounting base 32 facing the case cover 2 to fix the mounting base 32 in the insertion slot 10a.

[0083] During the assembly process, the mounting seat 32 can be first inserted into the insertion slot 10a in the box body 1 from the top side of the box body 1 downwards. The insertion slot 10a plays a role in the mounting seat 32 along the Figure 15 Then, the storage cover 12 is placed in the box body 1, and the storage cover 12 is pressed against the mounting seat 32 to fix the mounting seat 32 in the insertion slot 10a. In other words, the storage cover 12 plays a role in the mounting seat 32. Figure 15 The upper positioning in the middle prevents the mounting seat 32 from coming out from the top side of the plug slot 10a. In this way, the mounting seat 32 can be fixedly installed without using screws, bonding or other fastening methods, and no additional fasteners are required. The fixing method is reliable and the assembly time is saved.

[0084] In one embodiment, please refer to Figure 14 The earphone storage box includes a first rib 131 and two second ribs 132 protruding from the inner surface of the box body 1. The first rib 131 extends in a direction parallel to the rotation axis, and the first rib 131 supports the mounting seat 32. The two second ribs 132 extend from opposite ends of the first rib 131 toward the box cover 2. One end of the second rib 132 away from the box body 1 is bent toward the other second rib 132. The bent structure of the two second ribs 132 and the inner surface of the box body 1 together enclose the plug-in slot 10a.

[0085] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0086] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bistable hinge for a headphone charging case, characterized in that, Comprising: Mounting base, Adapter, the adapter is rotatably connected to the mounting base, the adapter has a rotation axis, the adapter has a first stable position, a critical position and a second stable position, and the critical position is located between the first stable position and the second stable position; Elastic member, the elastic member is loaded between the mounting base and the adapter. When the adapter is in the critical position, the torque exerted by the elastic member on the adapter is zero; when the adapter deviates to either side along the rotation direction from the critical position, the elastic member exerts a driving torque on the adapter to drive the adapter to move to the first stable position or the second stable position; The elastic member includes at least one torsion spring, the torsion spring includes a helix, a first leg and a second leg, the first leg and the second leg are connected to opposite ends of the helix along the axial direction, the first leg of the torsion spring is connected to the mounting base, and the second leg of the torsion spring is connected to the adapter to drive the adapter to rotate in both forward and reverse directions around the rotation axis, and the helix is suspended; The axis of the helix is perpendicular to the rotation axis.

2. The bistable hinge according to claim 1, wherein The critical position is located at the 1 / 2 of the rotation stroke between the first stable position and the second stable position; at the critical position, the pitch of the helix is the largest.

3. The bistable hinge according to claim 1, characterized in that, The number of the torsion springs is two, the ends of the first legs of the two torsion springs are fixedly connected, and the axes of the helices of the two torsion springs are parallel.

4. The bistable hinge according to claim 3, characterized in that, Two plug holes are provided on opposite sides of the adapter along the rotation axis direction, the end of the second leg of one of the torsion springs is inserted into one of the plug holes, and the end of the second leg of the other torsion spring is inserted into the other plug hole.

5. The bistable hinge according to claim 4, wherein The two plug holes are coaxial and the axis is parallel to the rotation axis.

6. The bistable hinge according to claim 4, wherein, The bistable hinge includes a rotating shaft, a first shaft hole is provided on the adapter, the mounting base includes a bottom plate and two columns located at opposite ends of the bottom plate, and a second shaft hole is provided on the columns, and the rotating shaft passes through the first shaft hole and the second shaft hole.

7. The bistable hinge according to claim 6, characterized in that, A concave area is formed on the top surface of the bottom plate, the mounting base includes a retaining piece located on the top side of the concave area, and the retaining piece and the surface of the concave area jointly define a limiting groove, and the first leg of the torsion spring is movably arranged in the limiting groove.

8. The bistable hinge according to claim 6, wherein, The mounting base includes a first limiting plate provided at the top ends of the two columns and a second limiting plate connected between the two columns; along the height direction of the columns, the second limiting plate is located between the first limiting plate and the bottom plate, and the rotating shaft is located between the first limiting plate and the second limiting plate; In the plane projection perpendicular to the height direction of the columns, the first limiting plate and the second limiting plate define a rotation space, a part of the structure of the adapter is located in the rotation space, and the first limiting plate and the second limiting plate jointly define the first stable position and the second stable position of the adapter.

9. The bistable hinge according to claim 8, characterized in that, The adapter includes a first sub-board and a second sub-board. The first shaft hole penetrates through the first sub-board. The second sub-board is located on one side of the first sub-board. The insertion hole is provided on the second sub-board. The dimension of the second sub-board along the rotation axis direction is smaller than that of the first sub-board.

10. The bistable hinge according to claim 9, characterized in that, A relief notch is formed at the edge of the first limiting plate. A relief groove is provided at the position where the second limiting plate is used to contact the second sub-board. When the adapter is in the first stable position, a part of the structure of the second sub-board is located in the relief groove and is in stop contact with the second limiting plate, and at least a part of the structure of the first sub-board is snapped into the relief notch.

11. The bistable hinge according to claim 9, wherein, The adapter further includes a shielding plate. The first sub-board is arranged on the surface of the shielding plate. The rotating shaft is located on the side of the shielding plate facing the first sub-board. When the adapter is in the first stable position, the shielding plate covers the space jointly defined by the two columns, the first limiting plate and the second limiting plate.

12. The bistable hinge according to any one of claims 1-11, characterized in that, The mounting seat is an integrally formed structure; and / or, the adapter is an integrally formed structure.

13. The bistable hinge according to any one of claims 1-11, characterized in that, The corresponding rotation angle between the first stable position and the second stable position is 80° to 100°.

14. An earphone charging case, characterized in that, Comprising: A box cover fixedly connected to the adapter; A box body for accommodating the earphone and charging the earphone; The bistable hinge according to any one of claims 1-13, wherein the mounting seat is fixedly arranged in the box body; the adapter drives the box cover to switch between the open state and the closed state of closing the box body. When the adapter is in the first stable position, the box cover is in the closed state. When the adapter is in the second stable position, the box cover is in the open state.

Images