Bistable hinge and earphone charging box

Abstract

The embodiment of the invention provides a bistable hinge and an earphone charging box. The bistable hinge comprises a mounting seat, an adapter and an elastic piece; the adapter is rotationally connected with the mounting seat, the adapter is provided with a rotating axis, the adapter is provided with a first steady-state position, a critical position and a second steady-state position, and the critical position is located between the first steady-state position and the second steady-state position; the elastic piece is loaded between the mounting base and the adapter, and when the adapter is located at the critical position, the torque applied to the adapter by the elastic piece is zero; when the adapter deviates to any side of the critical position in the rotating direction, the elastic piece applies driving torque to the adapter so as to drive the adapter to move to the first steady-state position or the second steady-state position. The bistable hinge provided by the embodiment of the invention has automatic closing and automatic opening functions within a certain rotation range, damping hand feelings exist in the closing process and the opening process, and the experience feeling of a user can be improved.

Description

Technical Field

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

[0002] A headphone charging case is a device that can both charge and store headphones. Specifically, when the headphones are not in use, they can be placed in the charging case for storage and charging, making them easy to carry around. Related art headphone charging cases use magnets to hold the case and lid closed. However, when the lid is opened, the magnetic force forces it to close, preventing it from remaining open. In this case, the user must manually hold the lid in place, or alternatively, provide a latching mechanism on the case. Summary of the Invention

[0003] In view of this, the embodiments of the present application hope to provide a bistable hinge and an earphone charging box with 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, which 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, and 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, which 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°~90°.

[0006] In some embodiments, the first leg and the second leg are connected to opposite ends of the spiral along the axial direction to drive the adapter to rotate in forward and reverse directions around the rotation axis, and the spiral is suspended.

[0007] 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 ​​the largest.

[0008] In some embodiments, there are two torsion springs, the ends of the first legs of the two torsion springs are fixedly connected, and the axes of the spirals of the two torsion springs are parallel.

[0009] In some embodiments, the adapter is provided with two plug holes on opposite sides along the direction of the rotation axis, wherein 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.

[0010] In some embodiments, the two plug holes are coaxial and the axis thereof is parallel to the rotation axis.

[0011] In some embodiments, the bistable hinge includes a rotating shaft, a first axial hole is provided on the adapter, the mounting base includes a base plate and two columns located at opposite ends of the base plate, a second axial hole is provided on the columns, and the rotating shaft is passed through the first axial hole and the second axial hole.

[0012] In some embodiments, a recessed area is formed on the top surface of the base plate, and the mounting seat includes a baffle located on the top side of the recessed area. The baffle and the surface of the recessed area together define a limiting groove, and the first leg of the torsion spring is movably disposed in the limiting groove.

[0013] In some embodiments, the mounting base includes a first limit plate arranged at the top ends of the two columns and a second limit plate connected between the two columns; along the height direction of the columns, the second limit plate is located between the first limit plate and the bottom plate, and the rotating shaft is located between the first limit plate and the second limit plate; in a plane projection perpendicular to the height direction of the columns, the first limit plate and the second limit plate define a rotation space, and part of the structure of the adapter is located in the rotation space, and the first limit plate and the second limit plate jointly define a first stable position and a second stable position of the adapter.

[0014] In some embodiments, the adapter includes a first sub-plate and a second sub-plate, the first axial hole passes through the first sub-plate, the second sub-plate is located on one side of the first sub-plate, the plug-in hole is arranged on the second sub-plate, and the size of the second sub-plate along the direction of the rotation axis is smaller than the size of the first sub-plate.

[0015] In some embodiments, an avoidance notch is formed at the edge of the first limit plate, and an avoidance groove is provided at the position where the second limit plate is used to contact the second sub-plate; when the adapter is in the first stable position, part of the structure of the second sub-plate is located in the avoidance groove and contacts the second limit plate stop, and at least part of the structure of the first sub-plate is stuck in the avoidance notch.

[0016] In some embodiments, the adapter also includes a shielding plate, the first sub-plate is arranged 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 limit plate and the second limit plate.

[0017] In some embodiments, the mounting base is an integrally formed structure; and / or the adapter is an integrally formed structure.

[0018] In some embodiments, the corresponding rotation angle between the first stable position and the second stable position is 80° to 100°.

[0019] An embodiment of the present application also provides an earphone charging box, comprising a box lid, a box body, and any one of the above-mentioned bistable hinges, wherein the box lid is fixedly connected to the adapter; the box body is used to accommodate and charge the earphones; the mounting seat is fixedly arranged in the box body; the adapter drives the box lid to switch between an open state and a closed state covering the box body, when the adapter is in a first stable position, the box lid is in a closed state, and when the adapter is in a second stable position, the box lid is in an open state.

[0020] In the bistable hinge of the embodiment of the present application, taking the adapter needing to switch from the first stable position to the second stable position as an example, 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 angle of rotation of the adapter can make the adapter pass the critical position, after passing the critical position, the elastic member applies a second torque W2 in the opposite direction to the adapter. The direction of the second torque is the same as the direction of rotation. 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 stably maintain the second stable position under the action of the second torque W2. The bistable hinge of the embodiment of the present application has the function of automatic closing and automatic opening within a certain rotation range. Both the closing process and the opening process have a damping feel, which is conducive to improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a bistable hinge according to an embodiment of the present application;

[0022] Figure 2 for Figure 1 An exploded schematic diagram of the structure shown;

[0023] Figure 3 This is a schematic structural diagram of an elastic member according to an embodiment of the present application;

[0024] Figure 4 This is a schematic structural diagram of a mounting base according to an embodiment of the present application;

[0025] Figure 5 for Figure 4 a schematic diagram of another perspective of the structure shown;

[0026] Figure 6 for Figure 5 a schematic diagram of another perspective of the structure shown;

[0027] Figure 7 for Figure 6 a schematic diagram of another perspective of the structure shown;

[0028] Figure 8 Schematic diagram of the mechanical principle of a bistable hinge according to an embodiment of the present application, wherein the adapter is in a first stable position;

[0029] Figure 9 for Figure 8 A schematic diagram of the mechanical principle of the structure in another state, wherein the adapter is in a second stable position;

[0030] Figure 10 This is a schematic diagram of the structure of an earphone charging box according to an embodiment of the present application, wherein the box cover is in a closed state;

[0031] Figure 11 for Figure 10 A schematic diagram of the structure of the earphone charging box in another state, wherein the box cover is open;

[0032] Figure 12 for Figure 11 An exploded schematic diagram of the structure shown;

[0033] Figure 13 for Figure 11 The structure shown omits the schematic diagram after the cover plate is stored;

[0034] Figure 14 This is a schematic structural diagram of a box body according to an embodiment of the present application;

[0035] Figure 15 for Figure 10 a cross-sectional view of the structure shown;

[0036] Figure 16 for Figure 15 A schematic diagram of the structure shown in another state, wherein the box cover is in the open state.

[0037] Description of Reference Numerals

[0038] Box body 1; plug-in slot 10a; storage cover 12; storage slot 12a; first rib 131; second rib 132; box cover 2; bistable hinge 3; adapter 31; plug-in hole 31a; first axial hole 31b; first sub-plate 312; second sub-plate 313; shielding plate 314; arc-shaped groove 314a; mounting seat 32; bottom plate 320; recessed area 320a; column 321; second axial hole 321a; first limiting plate 322; avoidance gap 322a, second limiting plate 323; avoidance groove 323a; rotation space 32a; baffle 324; limiting groove 324a; elastic member 33; torsion spring 33'; spiral body 331; first leg 332; second leg 333; rotating shaft 34. DETAILED DESCRIPTION

[0039] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0040] In the description of the embodiments of the present application, "top", "bottom", orientation or position relationship is based on the attached Figure 15 The orientation or position relationship shown, specifically, Figure 15 The upper part is referred to as "top" and the lower part is referred to as "bottom". It should be understood that these directional terms are only used to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting this application.

[0041] Embodiments of the present application provide a bistable hinge for an earphone charging box and an earphone charging box.

[0042] The earphone charging box is used to charge the accompanying earphones. Specifically, the earphone charging box has a power supply for storing electrical energy. When the earphones are placed in the earphone charging box, the power supply for storing electrical energy can charge the earphones. The earphones in the embodiments of the present application can be paired and connected with smart terminals such as mobile phones and tablets. When the user uses the smart terminal, the audio can be automatically switched to the earphones. The earphones can be Bluetooth earphones, infrared earphones, etc., without limitation.

[0043] See also Figures 10 to 12 The earphone charging box includes a box cover 2, a box body 1, and a bistable hinge 3 of an embodiment of the present application. The box cover 2 and the box body 1 are rotatably connected through the bistable hinge 3.

[0044] The bistable state in the embodiment of the present application means that there are at least two stable states during the rotation process, and in the stable state, even after the external force is removed, the current stable state can be reliably maintained.

[0045] See also Figure 1 and Figure 2 The bistable hinge 3 includes a mounting base 32, an adapter 31 and an elastic member 33. The adapter 31 has a rotation axis (simplified as Figure 8 and Figure 9 O point in the figure), the adapter 31 has a first stable position (refer to Figure 1 and Figure 15 ), critical position and second stable position (refer to Figure 16 ), the critical position is between the first stable position and the second stable position, and the adapter 31 switches between the first stable position and the second stable position. The elastic member 33 is loaded between the mounting base 32 and the adapter 31. In other words, for the elastic member 33, both the mounting base 32 and the adapter 31 are load-bearing members.

[0046] When the adapter 31 is in the critical position, the torque applied by the elastic member 33 to the adapter 31 is zero; when the adapter 31 deviates to either side of the critical position along the rotation direction, the elastic member 33 applies a driving torque to the adapter 31 to drive the adapter 31 to move to the first stable position or the second stable position.

[0047] It should be noted that the statement "when the adapter 31 deviates to either side of the critical position along the rotational direction, the elastic member 33 applies a driving torque to the adapter 31 to drive the adapter 31 to the first stable position or the second stable position" includes the following two situations: First, when the adapter 31 deviates from the critical position and is located on the first side of the critical position along the rotational direction, the elastic member 33 drives the adapter 31 to the first stable position. Second, when the adapter 31 deviates from the critical position and is located on the second side of the critical position along the rotational direction, the elastic member 33 drives the adapter 31 to the second stable position.

[0048] Specifically, see Figure 8 The elastic member 33 applies a force F1 to the adapter 31, and the force F1 generates a force around the rotation axis (simplified as Figure 8 The first torque W1 is the driving torque mentioned above. The adapter 31 moves to the first stable position and remains in the first stable position under the action of the first torque W1. That is to say, in the absence of external force or the action of the external force on the adapter 31 is not sufficient to overcome the resistance formed by the first torque W1, the adapter 31 will not deviate from the current first stable position.

[0049] See also Figure 9 The elastic member 33 applies a force F2 to the adapter 31, and the force F2 generates a force around the rotation axis (simplified as Figure 9The second torque W2 (at point O in the figure) is the aforementioned driving torque, wherein the first torque W1 and the second torque W2 are in opposite directions. Under the action of the second torque W2, the adapter 31 moves to the second stable position and remains in the current second stable position. In other words, in the absence of an external force or if the external force acting on the adapter 31 is insufficient to overcome the resistance created by the second torque W2, the adapter 31 will not deviate from the current second stable position.

[0050] When the adapter 31 needs to switch 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 torque W1. That is, the first torque W1 at this time is the resistance torque. When the adapter 31 is rotated to an angle that allows the adapter 31 to cross the above-mentioned critical position, the elastic member 33 applies a second torque W2 in the opposite direction to the adapter 31. The direction of the second torque W2 is the same as the rotation direction. At this time, the second torque W2 is the driving torque. Even if the user lets go, the adapter 31 can automatically rotate under the action of the elastic member 33 until it reaches the second stable position, and stably maintain the second stable position under the action of the second torque W2.

[0051] When the adapter 31 needs to switch 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 torque W2. That is, the second torque W2 at this time is the resistance torque. When the adapter 31 is rotated to an angle that allows the adapter 31 to cross the above-mentioned critical position, the elastic member 33 applies the first torque W1 in the opposite direction to the adapter 31. Even if the user lets go, the adapter 31 can automatically continue to rotate to the first stable position under the action of the elastic member 33, and stably maintain the first stable position under the action of the first torque W1.

[0052] That is to say, 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.

[0053] For example, the mounting base 32 is fixedly disposed in the box body 1. Specifically, a plug-in slot 10a is provided on the inner side of the box body 1. Part of the mounting base 32 can be inserted into the plug-in slot 10a from the opening of the box body 1 and fixed in the plug-in slot 10a. The adapter 31 is fixedly connected to the box cover 2, and the adapter 31 drives the box cover 2 to switch between an open state and a closed state covering the box body 1. Figure 15 When the adapter 31 is in the first stable position, the cover 2 is in the closed state. Figure 16 When the adapter 31 is in the second stable position, the box cover 2 is in the open state.

[0054] The specific type of the elastic member 33 is not limited. For example, in one embodiment, refer to Figure 2 , the elastic member 33 includes at least one torsion spring 33'. Figure 3 The torsion spring 33' includes a spiral body 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 spiral body 331 in the axial direction. 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 the forward and reverse directions around the rotation axis. In other words, the second leg 333 of the torsion spring 33' can drive the adapter 31 to rotate in the forward direction around the rotation axis, and can also drive the adapter 31 to rotate in the reverse direction around the rotation axis. The spiral body 331 is set in the air, that is, the spiral body 331 will move following the second leg 333.

[0055] It should be noted that the positive and negative directions refer to the two directions around the rotation axis. Figure 8 The clockwise direction of is named as the positive direction, Figure 8 The counterclockwise direction of is named reverse direction. Figure 8 The clockwise direction of is named the reverse direction, Figure 8 The counterclockwise direction is named the positive direction.

[0056] It is understood that the torsion spring 33' can generate the aforementioned first torque W1 in a compressed state or in a stretched state. Similarly, the torsion spring 33' can generate the aforementioned second torque W2 in a compressed state or in a stretched state. This is not a limitation.

[0057] There is no limitation on the placement of the spiral body 331 of the torsion spring 33 ′. For example, in one embodiment, the axial direction of the spiral body 331 may be parallel to the rotation axis.

[0058] In one embodiment, please refer to Figure 2 The angle between the axis of the spiral body 331 and the rotation axis is in the range of 45° to 90°. In this way, the space occupied by the torsion spring 33' in the direction perpendicular to the rotation axis can be reduced, making the structure of the bistable hinge compact.

[0059] When the adapter 31 rotates, the distance between the end of the first leg 332 and the end of the second leg 333 changes, causing the pitch of the helical body 331 to change. In other words, the helical body 331 undergoes axial elastic deformation, thus generating an axially resilient force. This resilient force acts on the adapter 31, forming the aforementioned forces F1 and F2. Because the aforementioned forces F1 and F2 are generally along the axial direction of the helical body 331, the directions of the forces are relatively well-defined. Therefore, during the design of the torsion spring, the diameter, material, and pitch of the helical body 331 can be easily designed.

[0060] In one embodiment, the axis of the spiral body 331 is perpendicular to the rotation axis. In other words, the angle between the axis of the spiral body 331 and the rotation axis is 90°.

[0061] It can be understood that in the embodiment where the axis of the spiral is parallel to the rotation axis, since the force of the first leg is formed by the rebound force of the first leg, the posture of the first leg is different as the degree of deformation of the torsion spring is different, which will lead to uncertainty in the direction of the force of the first leg, making the design process of the torsion spring extremely complicated.

[0062] In the embodiment where the axis of the spiral 331 is perpendicular to the rotation axis, since the torsion spring 33' relies on the force generated by the axial elastic deformation of the spiral 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 exert a large elastic force on the adapter 31. Figure 15 The dimensions in the height direction (up and down direction) and the width direction (left and right direction) are relatively small, which can make the bistable hinge structure compact.

[0063] When the mounting seat 32 is provided in the box body 1 of the earphone charging box, since the box body 1 not only has to accommodate the earphones but also has to be provided with a power supply, a circuit board, charging contacts, etc., there are many parts in the box body 1, so that the space in the box body 1 for accommodating the mounting seat 32 is relatively small. 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.

[0064] Taking the switching of the adapter 31 from the first stable position to the second stable position as an example, during the switching process of the adapter 31 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 helical body 331 first gradually increases and then gradually decreases.

[0065] In one embodiment, the critical position is located halfway between the first and second stable positions. At this critical position, the helical pitch is at its maximum, and the distance between the ends of the first leg 332 and the second leg 333 is at its minimum. At this critical position, the elastic potential energy of the torsion spring 33' is greater than that at other positions. Regardless of whether the adapter 31 is rotating forward or reverse, as long as the user moves the adapter 31 past this critical position, the torsion spring 33' can continue to drive the adapter 31 to rotate with its greater elastic potential energy.

[0066] It is understood that the number of torsion springs 33' can be one or more, wherein more means no less than two. It should be noted that in the embodiment with multiple torsion springs 33', the multiple torsion springs 33' can be spaced apart from each other and not interfere with each other, or can be connected to each other.

[0067] It should be noted that in the embodiment with only one torsion spring 33', the first leg 332 and the second leg 333 will both generate a force component along the direction of the rotation axis, and the force components of the two legs are in the same direction. This force component will force the adapter 31 to move along the direction of the rotation axis, causing a shaking and unstable feeling to the user. For this reason, please refer to the embodiment of this application. Figure 3 There are two torsion springs 33', the ends of their first legs are fixedly connected, and their axes are parallel. In other words, the two torsion springs 33' form a double torsion spring structure. This double torsion spring structure offers high strength, high torsional force, and excellent stability. It resists deformation under high stress, has a long service life, and improves the reliability and durability of the bistable hinge.

[0068] On the other hand, the two torsion springs 33' have opposite forces along the rotation axis and can cancel each other out, so 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 gap between the adapter 31 and the mounting seat 32 along the rotation axis. This axial gap must ensure that the adapter 31 and the mounting seat 32 can be assembled normally, but it must not cause a large dry friction between the adapter 31 and the mounting seat 32. Due to the existence of this axial gap, the adapter 31 may move axially. Under the action of the two torsion springs 33', when the adapter 31 is in the middle position, the axial forces of the two torsion springs 33' are balanced, and when the adapter 31 is along the rotation axis, the axial forces of the two torsion springs 33' are balanced. Figure 3 When the left side of the adapter moves a little, the torsion spring 33' on the right will force the adapter 31 to move to the right. Figure 3When the right side of the adapter 31 moves slightly, the torsion spring on the left side forces the adapter 31 to move to the left. This reciprocating cycle stabilizes the adapter 31 in its central equilibrium position. This prevents axial movement even if there is significant axial clearance on either side of the adapter 31. This reduces the manufacturing and assembly precision requirements for the adapter 31 and mounting base 32, thus reducing production costs.

[0069] Specifically, in a specific embodiment of this application, please refer to Figure 3 The first leg 332 and the second leg 333 are both bent structures, and the two torsion springs 33' roughly form a regular hexagonal structure.

[0070] In one embodiment, the corresponding rotation angle between the second stable position and the first stable position is 80° to 100°, for example, 80°, 90°, 100°, etc.

[0071] In one embodiment, please refer to Figure 2 The adapter 31 has two insertion holes 31a on opposite sides along the rotation axis. The end of the second leg 333 of one torsion spring 33' is inserted into one insertion hole 31a, and the end of the second leg 333 of the other torsion spring 33' is inserted into the other insertion hole 31a. As the adapter 31 rotates about the rotation axis, the end of the second leg 333 of the torsion spring 33' can rotate within the insertion hole 31a, thereby improving the stress conditions on the torsion spring 33'.

[0072] In one embodiment, the two insertion holes 31a are coaxial and parallel to the rotation axis. In other words, the two insertion holes 31a are located on the same straight line.

[0073] The rotation connection structure of the adapter 31 and the mounting base 32 is not limited. For example, in some embodiments, see Figure 2 The bistable hinge includes a rotating shaft 34, and the adapter 31 and the mounting base 32 are rotatably connected via the rotating shaft 34. Figure 4 and Figure 5 The mounting base 32 includes a base plate 320 and two upright posts 321 located at opposite ends of the base plate 320. Figure 1 Part of the 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 is provided in the first shaft hole and the second shaft hole 321a.

[0074] Please continue reading Figure 4 In one embodiment, the mounting base 32 includes a first limiting plate 322 disposed at the top of the two columns 321 and a second limiting plate 323 connected between the two columns 321. Figure 5Along 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. 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 rotation space 32a, and part of the structure of the adapter 31 is located in the rotation space 32a. 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.

[0075] 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 a side of the first sub-plate 312 perpendicular to the rotation axis. The first axial hole 31b passes through the first sub-plate 312, and the insertion hole 31a is provided on the second sub-plate 313. The dimension of the second sub-plate 313 along the rotation axis is smaller than that of the first sub-plate 312. This reduces the distance between the ends of the second legs 333 of the two torsion springs 33', facilitating the installation of the torsion springs 33'.

[0076] In one embodiment, please refer to Figure 5 and Figure 6 The top surface of the bottom plate 320 is formed with a recessed area 320a. The mounting base 32 includes a blocking piece 324 located on the top side of the recessed area 320a. The blocking piece 324 and the surface of the recessed area 320a together define a limiting groove 324a. Figure 15 and Figure 16 The first leg 332 of the torsion spring 33' is movably disposed within the retaining groove 324a. That is, in this embodiment, during assembly, it is sufficient to simply snap the first leg 332 of the torsion spring 33' into the retaining groove 324a. The stopper 324 prevents the first leg 332 from separating from the bottom plate 320 from the top side of the recessed area 320a.

[0077] In one embodiment, please refer to Figure 5 A clearance 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 portion of the first sub-plate 312 engages the clearance notch 322a, and the second sub-plate 313 comes into contact with the second limiting plate 323. In other words, the adapter 31 comes into contact with the second limiting plate 323 via the second sub-plate 313. The clearance notch 322a provides clearance for the first sub-plate 312, preventing interference between the first sub-plate 312 and the first limiting plate 322 during rotation, allowing the adapter 31 to rotate with a greater range.

[0078] In one embodiment, please refer to Figure 4 and Figure 7The second limiting plate 323 is provided with an escape groove 323a at the location where it contacts the second sub-plate 313. When the adapter 31 is in the first stable position, part of the second sub-plate 313 is located within the escape groove 323a and contacts the second limiting plate 323. This escape groove 323a allows a smaller spacing between the first limiting plate 322 and the second limiting plate 323 in a direction perpendicular to the height of the column 321, making the bistable hinge structure more compact while also allowing the adapter 31 to have a larger rotation range.

[0079] In one embodiment, please continue to refer to Figure 2 The adapter 31 also includes a shielding plate 314, with the second sub-plate 313 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 defined by the two uprights 321, the first limiting plate 322, and the second limiting plate 323. The shielding plate 314 can obscure the rotating shaft 34, preventing the user from viewing the rotating shaft 34 from the side of the shielding plate 314 facing away from the rotating shaft 34. Furthermore, when the adapter 31 is in the first stable position, the shielding plate 314 can also conceal the mounting base 32, the torsion spring 33', and other structures, preventing the user from viewing portions of the mounting structure from the side of the shielding plate 314 facing away from the rotating shaft 34, thereby enhancing the aesthetic appearance of the bistable hinge structure.

[0080] In one embodiment, please continue to refer to Figure 2 The shielding plate 314 is provided with an arcuate groove 314a on its surface. The arcuate groove 314a extends axially along the axis of the rotating shaft 34, with the rotating shaft 34 partially located within the arcuate groove 314a. The arcuate groove 314a reduces the distance between the surface of the shielding plate 314 facing away from the rotating shaft 34 and the axis of rotation of the rotating shaft 34, making the bistable hinge structure more compact. Furthermore, during the rotation of the adapter 31, the cooperation between the arcuate groove 314a and the rotating shaft 34 also serves as a rotation guide, making the rotation of the adapter 31 smoother.

[0081] It is understandable that the above-mentioned mounting seat 32 can be an integrally formed structure or a split structure, which is not limited here.

[0082] The adapter 31 can be an integrally formed structure or a split structure, which is not limited here.

[0083] In order to facilitate the fixing of the mounting base 32 into the slot 10a, in one embodiment, refer to Figure 13 and Figure 14 The earphone charging box includes a storage cover 12, which is formed with a storage groove 12a for accommodating the earphone. The storage cover 12 is pressed against the side of the mounting seat 32 facing the box cover 2 to fix the mounting seat 32 in the plug-in slot 10a.

[0084] During the assembly process, the mounting base 32 can be inserted downward from the top side of the box body 1 into the insertion slot 10a in the box body 1. The insertion slot 10a plays a role in the mounting base 32. 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 base 32 from coming out of the top side of the insertion slot 10a. In this way, the fixed installation of the mounting base 32 can be achieved without using screws, bonding or other fastening methods, without the need for additional fasteners, the fixing method is reliable, and the assembly time is saved.

[0085] In one embodiment, please refer to Figure 14 The headphone 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 parallel to the rotation axis and supports the mounting base 32. The two second ribs 132 extend from opposite ends of the first rib 131 toward the box lid 2. The ends of the second ribs 132 facing away from the box body 1 bend toward the other second rib 132. The bent structures of the two second ribs 132 and the inner surface of the box body 1 together form the insertion slot 10a.

[0086] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0087] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A bistable hinge, characterized in that: include: Mounting seat, an adapter, the adapter being rotatably connected to the mounting seat, the adapter having a rotation axis, the adapter having a first stable position, a critical position, and a second stable position, the critical position being located between the first stable position and the second stable position; An elastic member, wherein the elastic member is loaded between the mounting seat and the adapter. When the adapter is in a critical position, the torque applied by the elastic member to the adapter is zero; when the adapter is deflected 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.

2. The bistable hinge according to claim 1, characterized in that: The elastic member includes at least one torsion spring, which 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°~90°.

3. The bistable hinge according to claim 2, characterized in that: The first leg and the second leg are connected to opposite ends of the spiral body along the axial direction to drive the adapter to rotate in forward and reverse directions around the rotation axis, and the spiral body is suspended.

4. The bistable hinge according to claim 2, characterized in that: 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 ​​the largest.

5. The bistable hinge according to claim 2, characterized in that: There are two torsion springs, 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.

6. The bistable hinge according to claim 5, characterized in that: The adapter is provided with two plug-in holes on opposite sides along the direction of the rotation axis, the end of the second leg of one of the torsion springs is inserted into one of the plug-in holes, and the end of the second leg of the other torsion spring is inserted into the other plug-in hole; the two plug-in holes are coaxial and the axes are parallel to the rotation axis.

7. The bistable hinge according to claim 6, characterized in that: The bistable hinge includes a rotating shaft, a first axial hole is provided on the adapter, the mounting seat includes a base plate and two columns located at opposite ends of the base plate, a second axial hole is provided on the column, and the rotating shaft is passed through the first axial hole and the second axial hole; a recessed area is formed on the top surface of the base plate, and the mounting seat includes a baffle located on the top side of the recessed area, the baffle 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.

8. The bistable hinge according to claim 6, wherein: The bistable hinge includes a rotating shaft, a first shaft hole is provided on the adapter, the mounting base includes a base plate and two columns located at opposite ends of the base plate, the columns are provided with second shaft holes, the rotating shaft passes through the first shaft hole and the second shaft hole; 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 base plate, and the rotating shaft is located between the first limiting plate and the second limiting plate; In a plane projection perpendicular to the height direction of the column, the first limiting plate and the second limiting plate define a rotation space, 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 a first stable position and a second stable position of the adapter.

9. The bistable hinge according to claim 8, characterized in that: The adapter includes a first sub-plate and a second sub-plate, the first axial hole passes through the first sub-plate, the second sub-plate is located on one side of the first sub-plate, the plug hole is provided on the second sub-plate, and the size of the second sub-plate along the direction of the rotation axis is smaller than that of the first sub-plate; wherein, An avoidance notch is formed at an edge of the first limiting plate, and an avoidance groove is provided at a position where the second limiting plate contacts the second sub-plate; when the adapter is in the first stable position, a portion of the structure of the second sub-plate is located in the avoidance groove and contacts the stopper of the second limiting plate, and at least a portion of the structure of the first sub-plate is stuck in the avoidance notch; and / or, The adapter also includes a shielding plate, the first sub-plate is arranged 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 limit plate and the second limit plate.

10. An earphone charging box, characterized in that: include: a box cover, the box cover being fixedly connected to the adapter; A box body, used for accommodating the earphones and charging the earphones; In the bistable hinge described in any one of claims 1 to 9, the mounting seat is fixedly arranged in the box body; the adapter drives the box lid to switch between an open state and a closed state covering the box body, when the adapter is in a first stable position, the box lid is in a closed state, and when the adapter is in a second stable position, the box lid is in an open state.

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