Locking mechanism for a central armrest of a car seat

Abstract

This application discloses a locking mechanism for a center armrest of an automobile seat. The locking mechanism includes: a bracket body, which has two spatial orientations: a stowed position and an unfolded position. The bracket body is provided with a fixed shaft and a rotating shaft; a locking plate, which is fixedly connected to the fixed shaft and cannot rotate relative to the fixed shaft; and an unlocking component, which is connected to the rotating shaft and can rotate around the axis of the rotating shaft. The bracket body and the unlocking component together can rotate around the axis of the fixed shaft between the stowed position and the unfolded position. When the bracket body is in the stowed position, the unlocking component abuts and engages with the locking plate, and the weight of the unlocking component restricts the rotation of the bracket body around the fixed shaft. When it is necessary to change the bracket body from the stowed position to the unfolded position, the unlocking component needs to be driven to overcome its own weight and rotate in the opposite direction around the rotating shaft to disengage from the locking plate, thereby allowing the bracket body to rotate from the stowed position to the unfolded position around the fixed shaft.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and more specifically to a locking mechanism for a center armrest of an automotive seat. Background Technology

[0002] Currently, armrest locks, as a functional component of the center armrest of a car seat, are generally installed on the side of the center armrest. They have locking and unlocking functions, improving the applicability and safety of the center armrest.

[0003] However, many armrest locks currently do not have a self-locking function in the stored position (locked position). As the functions of the center armrest of the seat become more and more complicated and the weight becomes heavier, when the car is traveling at high speed and braking suddenly or when there is a vehicle collision, the center armrest may tip forward in the direction of inertial force, resulting in a decrease in comfort and safety, and may even cause injury to passengers and other safety hazards. Utility Model Content

[0004] The purpose of this application is to provide a locking mechanism for the center armrest of a car seat to solve the problem that the center armrest will flip in the direction of inertial force when the vehicle brakes suddenly.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A locking mechanism for a car seat center armrest is provided, comprising: a bracket body, the bracket body being positioned in either a stowed or unfolded position, the bracket body having a fixed shaft and a rotating shaft; a locking plate, the locking plate being fixedly connected to the fixed shaft and being non-rotatable relative to the fixed shaft; and an unlocking component, the unlocking component being connected to the rotating shaft and capable of rotating around the axis of the rotating shaft; wherein, the bracket body and the unlocking component together as a whole can rotate around the axis of the fixed shaft between the stowed and unfolded positions; when the bracket body is in the stowed position, the unlocking component abuts and engages with the locking plate, and the weight of the unlocking component restricts the rotation of the bracket body around the fixed shaft; when it is necessary to change the bracket body from the stowed position to the unfolded position, the unlocking component needs to be driven to overcome its own weight and rotate in the opposite direction around the rotating shaft to disengage from the locking plate, thereby allowing the bracket body to rotate from the stowed position to the unfolded position around the fixed shaft.

[0006] As a preferred embodiment, the unlocking assembly includes a ratchet plate, an unlocking bracket, and an elastic element; a first end of the elastic element abuts against the unlocking bracket, and a second end of the elastic element abuts against the bracket body; wherein, when the bracket body is in the stored position, the elastic force of the elastic element acts on the unlocking bracket, driving the unlocking bracket to abut against the ratchet plate, thereby causing the ratchet plate to abut and engage with the locking plate, so as to lock the bracket body from rotating around the fixed axis.

[0007] As another preferred embodiment, both the ratchet plate and the unlocking bracket are connected to the rotating shaft, the ratchet plate and the unlocking bracket are stacked together, and the end of the unlocking bracket is provided with a protrusion, which acts on the outer wall surface of the ratchet plate.

[0008] In a further preferred embodiment, the ratchet plate is provided with a slot, and the unlocking bracket has a protruding ratchet pin, which is inserted into the slot. The unlocking bracket is driven to rotate around the rotation axis, causing the ratchet pin to move within the slot and drive the ratchet plate to rotate around the rotation axis, thereby disengaging the ratchet plate from the locking plate. When the ratchet plate disengages from the locking plate, the bracket body is unlocked relative to the locking plate, and the bracket body can rotate around the fixed axis, thus changing from the stored position to the unfolded position.

[0009] Further preferably, the groove is a U-shaped groove; wherein, when the unlocking bracket is driven to rotate around the rotating shaft, the ratchet pin moves within the U-shaped groove, and has a free stroke when moving within the first segment of the U-shaped groove, at which time the movement of the ratchet pin does not drive the ratchet to rotate.

[0010] Further preferably, a slot is provided on the side of the unlocking bracket near the protrusion, and a first limiting part is provided on the protrusion of the bracket body. The main body of the elastic element is sleeved on the rotating shaft. The first end of the elastic element is embedded in the slot and fixed, and the second end of the elastic element abuts against the first limiting part and is fixed. When the unlocking bracket is driven to rotate around the rotating shaft to disengage the ratchet plate from the locking plate, the first end and the second end of the elastic element approach each other, and the elastic element undergoes elastic deformation to store energy. When the ratchet plate and the locking plate abut and engage, the elastic element is elastically released, driving the unlocking bracket to rotate around the rotating shaft to reset, and abuts against the outer wall surface of the ratchet plate through the protrusion.

[0011] In a further preferred embodiment, the locking plate is provided with a first locking tooth, and correspondingly, the ratchet plate is provided with a locking portion. The first locking tooth includes a first arc-shaped surface and a first horizontal surface, and the locking portion also includes a second arc-shaped surface and a second horizontal surface. When the locking plate and the ratchet plate are locked together, the first arc-shaped surface abuts against the second arc-shaped surface, and the first horizontal surface abuts against the second horizontal surface.

[0012] Preferably, an arc-shaped abutment is also provided on the side near the first horizontal plane. When the bracket body rotates from the unfolded position to the stored position, the arc-shaped abutment supports the second horizontal plane and abuts against the first horizontal plane.

[0013] Preferably, the card plate is further provided with a second card tooth and a third card tooth, and a second limiting part is provided on the bracket body; when the bracket body is in the retracted position, the second card tooth abuts against the second limiting part; when the bracket body is in the unfolded position, the third card tooth abuts against the second limiting part, and the abutting surfaces of the second card tooth and the third card tooth are arranged facing each other.

[0014] Preferably, the bracket body includes a first support plate and a second support plate, and the locking plate and the unlocking component are both sandwiched between the first support plate and the second support plate.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] When the bracket body is in the stowed position, i.e., the locked position, the engagement between the unlocking component and the locking plate creates a mechanical constraint. The weight of the unlocking component itself constitutes a dynamic locking force. The locking force of the unlocking component on the locking plate is positively correlated with the inertial force generated by sudden braking. This means that any external force attempting to cause the bracket body to rotate unintentionally around its fixed axis, such as the inertial force of sudden braking, will actually strengthen the engagement force between the unlocking component and the locking plate. Therefore, the unlocking action must overcome the reverse drive of the unlocking component's own weight. Thus, only when the driver deliberately operates the unlocking component, causing it to rotate against gravity around its axis, can the engagement between the unlocking component and the locking plate be released. Therefore, vibrations or impacts during normal vehicle operation will increase the locking force and prevent unlocking. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the external connecting plate of the locking mechanism;

[0018] Figure 2 This is a schematic diagram of the locking mechanism.

[0019] Figure 3 This is an exploded view of the locking structure.

[0020] Figure 4 This is a schematic diagram of the internal components of the locking mechanism when the bracket body is in the stored position.

[0021] Figure 5 This is a schematic diagram of the internal components of the locking mechanism when the support body is in the unfolded position.

[0022] Figure 6 This is a schematic diagram of the locking mechanism from a side view.

[0023] In the diagram: 1. Locking mechanism; 2. Outer connecting plate; 10. Bracket body; 11. Fixed shaft; 12. Rotating shaft; 13. First support plate; 14. Second support plate; 15. First limiting part; 16. Second limiting part; 20. Clamping plate; 21. First clamping tooth; 211. First arc-shaped surface; 212. First horizontal surface; 213. Arc-shaped abutment part; 22. Second clamping tooth; 23. Third clamping tooth; 30. Unlocking component; 31. Ratchet; 311. Groove; 312. Clamping part; 313. Second arc-shaped surface; 314. Second horizontal surface; 32. Unlocking bracket; 321. Protrusion; 322. Ratchet pin; 323. Slot; 33. Elastic element; 331. First end; 332. Second end; 34. Connecting hole. Detailed Implementation

[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] In a preferred embodiment, see Figures 1 to 6This application provides a locking mechanism 1 for a center armrest of an automobile seat. The locking mechanism 1 includes: a bracket body 10, which is located in two spatial positions: a stowed position and an unfolded position. The bracket body 10 is provided with a fixed shaft 11 and a rotating shaft 12; a locking plate 20, which is fixedly connected to the fixed shaft 11 and cannot rotate relative to the fixed shaft 11, and the locking plate 20 remains fixed relative to the fixed shaft 11 from beginning to end; and an unlocking component 30, which is connected to the rotating shaft 12 and can rotate around the axis of the rotating shaft 12. The bracket body 10 and the unlocking component 30, as a whole, can rotate between the stored position and the unfolded position around the axis of the fixed shaft 11. When the bracket body 10 is in the stored position, the unlocking component 30 abuts and engages with the locking plate 20, and the weight of the unlocking component 30 restricts the rotation of the bracket body 10 around the fixed shaft 11. When it is necessary to change the bracket body 10 from the stored position to the unfolded position, the unlocking component 30 needs to be driven to overcome its own weight and rotate in the opposite direction around the rotation axis 12 to disengage from the locking plate 20, so that the bracket body 10 can rotate from the stored position to the unfolded position around the fixed shaft 11.

[0029] For details, please refer to Figure 1 The locking mechanism 1 in this application is used to connect an external connecting plate 2. The external connecting plate 2 is suitable as a support plate for the center armrest of a car seat. For example, the external connecting plate 2 can be covered with materials such as leather to form a complete center armrest for the car seat. One end of the external connecting plate 2 is connected to the fixed shaft 11, and the other end of the external connecting plate 2 is fixedly connected to the bracket body 10. Therefore, the external connecting plate 2 and the bracket body 10 are also an integral moving structure. The positions of the clamping plate 20 and the fixed shaft 11 are unchanged. The external connecting plate 2 and the bracket body 10 can rotate relative to the clamping plate 20 and the fixed shaft 11. The movement state of the external connecting plate 2 and the bracket body 10 is consistent. Therefore, for the sake of simplicity, the movement state of the fixed support plate will be described below.

[0030] See details Figure 4 The stowage position, also known as the locked position, is the location of the center armrest of a car seat when it is stowed. It is typically located in the backrest of the rear seats and is in a tilted position. See [link / reference]. Figure 5 This indicates that the bracket body 10 is in the unfolded position, which is also the usage position. This is the position when the center armrest of the car seat is rotated and the center armrest extends relative to the seat back. At this time, the bracket body 10 is approximately in a horizontal position, which facilitates support for the user's arm. The angle of rotation of the bracket body 10 from the stowed position to the unfolded position is preferably greater than 90 degrees.

[0031] Therefore, when the support body 10 in this application is in the storage position, see details below. Figure 4 The locking plate 20 is located at the lower part of the unlocking component 30. The unlocking component 30 engages with the locking plate 20 along its own weight direction to... Figure 4 As shown, the unlocking component 30 engages with the card plate 20 along the X2 direction. When the bracket body 10 needs to be moved from the stored position to the unfolded position, the bracket body 10 and the outer connecting plate 2 need to rotate counterclockwise along the fixed axis 11. Since the unlocking component 30 is rotatably connected to the rotating shaft 12, the direction of the unlocking component 30's own weight is also counterclockwise relative to the rotating shaft 12. When the vehicle brakes suddenly during driving, the inertial force is directed towards the X3 direction. When the inertial force acts on the unlocking component 30, the direction of the component of the inertial force is the same as the direction of the force exerted by the unlocking component 30 on the card plate 20. Therefore, the locking force of the unlocking component 30 on the card plate 20 is positively correlated with the weight of the unlocking component 30. The inertial force generated when the vehicle brakes suddenly is also positively correlated with the locking force of the unlocking component 30 on the card plate 20. As a result, the locking of the card plate 20 and the unlocking component 30 will not disengage due to sudden braking or collision, thus constructing a more stable and reliable self-locking mechanism.

[0032] As a preferred option, see Figures 2 to 3 The unlocking component 30 includes a ratchet plate 31, an unlocking bracket 32, and an elastic element 33. The first end 331 of the elastic element 33 abuts against the unlocking bracket 32, and the second end 332 of the elastic element 33 abuts against the bracket body 10. When the bracket body 10 is in the stored position, the elastic force of the elastic element 33 acts on the unlocking bracket 32, causing the unlocking bracket 32 ​​to abut against the ratchet plate 31, thereby causing the ratchet plate 31 to abut against and engage with the locking plate 20, so as to lock the bracket body 10 to rotate around the fixed axis 11.

[0033] Among them, the elastic element 33 is a torsion spring structure, and the two ends of the elastic element 33 are the two ends of the torsion spring.

[0034] As another preferred option, see Figures 2 to 3 Both the ratchet plate 31 and the unlocking bracket 32 ​​are connected to the rotating shaft 12. The ratchet plate 31 and the unlocking bracket 32 ​​are stacked together. The rotating shaft 12 is shared by the stacking of the base plate and the unlocking bracket 32, eliminating the separate rotating shaft of the unlocking bracket 32. The structure is simple, the space utilization is high, and the application is wide. The end of the unlocking bracket 32 ​​is provided with a protrusion 321, which acts on the outer wall surface of the ratchet plate 31.

[0035] Further preferably, the ratchet plate 31 is provided with a slot 311, and the unlocking bracket 32 ​​is provided with a ratchet pin 322. The ratchet pin 322 is inserted into the slot 311. Through the cooperation between the ratchet pin 322 and the slot 311, the linkage between the ratchet plate 31 and the unlocking bracket 32 ​​in the overlapping arrangement is realized. Specifically, the unlocking bracket 32 ​​is driven to rotate around the rotating shaft 12, and then the ratchet pin 322 moves in the slot 311 and drives the ratchet plate 31 to rotate around the rotating shaft 12, thereby disengaging the ratchet plate 31 from the locking plate 20. When the ratchet plate 31 is disengaged from the locking plate 20, the bracket body 10 is unlocked relative to the locking plate 20, and the bracket body 10 can rotate around the fixed shaft 11, thereby changing from the stored position to the unfolded position.

[0036] Further preferably, the slot 311 is a U-shaped slot; wherein, when the drive unlocking bracket 32 ​​rotates around the rotating shaft 12, the ratchet pin 322 moves in the U-shaped slot, and has a free stroke when moving within the first segment of the U-shaped slot, at which time the movement of the ratchet pin 322 does not drive the ratchet 31 to rotate.

[0037] Specifically, the U-shaped groove has a certain physical isolation mechanism. When the vehicle vibration causes the unlocking bracket 32 ​​to drive the ratchet pin 322 to swing slightly, the ratchet pin 322 only slides in the arc section of the U-shaped groove. At this time, it is the no-travel stage. The ratchet 31 is always in a biting and abutting state with the locking plate 20, and the ratchet 31 remains stationary relative to the unlocking bracket 32.

[0038] For further optimization, see [link to relevant documentation]. Figures 2 to 4 The bracket body 10 includes a first support plate 13 and a second support plate 14. The locking plate 20 and the unlocking assembly 30 are both sandwiched between the first support plate 13 and the second support plate 14. A locking groove 323 is provided on the side of the unlocking bracket 32 ​​near the protrusion 321. A first limiting part 15 is provided on the corresponding protrusion on the bracket body 10. (See also...) Figure 6 The first limiting part 15 is preferably disposed on the second support plate 14, and the main body of the elastic member 33 is sleeved on the rotating shaft 12. The first end 331 of the elastic member 33 is embedded in the slot 323 for fixation, and the second end 332 of the elastic member 33 is abutted against the first limiting part 15 for fixation. The slot 323 is disposed on one side of the protrusion 321, and there is a certain distance between the protrusion 321 and the first limiting part 15 to ensure that the elastic member 33 has sufficient elastic deformation stroke. When the unlocking bracket 32 ​​is driven to rotate around the rotating shaft 12 to disengage the ratchet plate 31 from the locking plate 20, the first end 331 and the second end 332 of the elastic member 33 approach each other, and the elastic member 33 undergoes elastic deformation to store energy. When the ratchet plate 31 and the locking plate 20 abut and engage, the elastic member 33 is elastically released, driving the unlocking bracket 32 ​​to rotate around the rotating shaft 12 to reset, and abutting against the outer wall surface of the ratchet plate 31 through the protrusion 321.

[0039] The unlocking bracket 32 ​​has a protruding connection hole 34 at one end, which is connected to a drive component, such as a drive motor or a manual crank. Therefore, when it is necessary to unlock the ratchet plate 31 and the locking plate 20, the unlocking bracket 32 ​​is driven to move in the X4 direction by the drive component. The first end 331 and the second end 332 of the elastic member 33 gradually approach each other, and the ratchet pin 322 drives the ratchet plate 31 to rotate clockwise through the slot 311, thereby realizing the separation of the ratchet plate 31 and the locking plate 20.

[0040] In a further preferred embodiment, the locking plate 20 is provided with a first locking tooth 21, and correspondingly, the ratchet plate 31 is provided with a locking part 312. The first locking tooth 21 includes a first arc-shaped surface 211 and a first horizontal surface 212, and the locking part 312 also includes a second arc-shaped surface 313 and a second horizontal surface 314. When the locking plate 20 and the ratchet plate 31 are locked together, the first arc-shaped surface 211 abuts against the second arc-shaped surface 313, and the first horizontal surface 212 abuts against the second horizontal surface 314.

[0041] The first arc-shaped surface 211 of the first locking tooth 21 provides a gradual guide for the locking process. During the locking process, the second horizontal surface 314 of the locking part 312 will first contact the first arc-shaped surface 211 of the first locking tooth 21, thereby reducing the impact of the collision through curved surface contact and avoiding rigid collision between the locking tooth and the locking part 312. The locking process refers to the process of the bracket body 10 changing from the unfolded position to the stored position.

[0042] After locking is completed, a surface support is formed between the first horizontal surface 212 and the second horizontal surface 314, which significantly improves the contact strength between the ratchet plate 31 and the locking plate 20.

[0043] Preferably, an arc-shaped abutment portion 213 is also provided on the side near the first horizontal plane 212. When the support body 10 rotates from the unfolded position to the stored position, the arc-shaped abutment portion 213 supports the second horizontal plane 314 to abut against the first horizontal plane 212.

[0044] Before the first horizontal surface 212 and the second horizontal surface 314 are formally brought into contact, the arc-shaped contact part 213 has eliminated the fit gap through pre-lifting action, forming over-positioning constraint, effectively avoiding micro-displacement caused by vibration.

[0045] Preferably, the card plate 20 is further provided with a second card tooth 22 and a third card tooth 23, and a second limiting part 16 is provided on the support body 10. When the support body 10 is in the retracted position, the second card tooth 22 abuts against the second limiting part 16. When the support body 10 is in the unfolded position, the third card tooth 23 abuts against the second limiting part 16. The abutting surfaces of the second card tooth 22 and the third card tooth 23 are arranged facing each other. That is, the arc angle between the abutting surface of the second card tooth 22 and the abutting surface of the third card tooth 23 corresponds to the rotatable angle of the support body 10. By setting the second card tooth 22 and the third card tooth 23, the maximum rotatable angle of the support body 10 is limited, thereby avoiding excessive rotation of the support body 10.

[0046] Therefore, in the complete use of the locking mechanism 1, the bracket body 10 in the locking mechanism 1 needs to go through four stages: being stationary in the retracted position, changing from the retracted position to the unfolded position, being stationary in the unfolded position, and changing from the unfolded position to the retracted position. Specifically, when the bracket body 10 is stationary in the retracted position, the elastic potential energy of the elastic element 33 acts on the protrusion 321 of the unlocking bracket 32. The protrusion 321 abuts against the ratchet plate 31, so that the second horizontal surface 314 in the latching part 312 on the ratchet plate 31 contacts and abuts against the first horizontal surface 212 in the first latching tooth 21, and the second arc-shaped surface 313 partially contacts and abuts against the first arc-shaped surface 211, thereby realizing the locking between the ratchet plate 31 and the latching plate 20. At this time, the second limiting part 16 provided on the first support plate 13 is close to the second latching tooth 22 on the latching plate 20, such as Figure 4 As shown.

[0047] When the bracket body 10 needs to be changed from the stored position to the unfolded position, the drive unlocking bracket 32 ​​moves in the X4 direction. The unlocking bracket 32 ​​drives the ratchet plate 31 to move clockwise through the ratchet pin 322 inserted into the slot 311, thereby disengaging the locking part 312 on the ratchet plate 31 from the first locking tooth 21. At this time, the bracket body 10 returns to a rotatable state relative to the locking plate 20 and the fixed shaft 11. The user only needs to rotate the bracket body 10 counterclockwise relative to the fixed shaft 11 until... Figure 5 As shown, due to the presence of the second limiting part 16 on the first support plate 13, the rotation range of the bracket body 10 is fixed, and the second limiting part 16 abuts against the third locking tooth 23 to complete the rotation of the bracket body 10.

[0048] When the bracket body 10 needs to be changed from the unfolded position to the stowed position, there is no need to operate the unlocking bracket 32. The user only needs to operate the outer connecting plate 2. The outer connecting plate 2 drives the bracket body 10 to move clockwise relative to the fixed axis 11, so that the second horizontal surface 314 in the latching part 312 of the ratchet plate 31 passes over the first arc-shaped surface 211 in the first latching tooth 21, so as to gradually abut and engage with the first horizontal surface 212 in the first latching tooth 21. Then, the elastic member 33 provides locking force to the unlocking bracket 32 ​​and the ratchet plate 31 to keep the bracket body 10 in the stowed position.

[0049] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A locking mechanism for the center armrest of a car seat, characterized in that, include: The support body is located in two spatial positions: a storage position and an unfolded position. The support body is provided with a fixed axis and a rotating axis. A clamping plate is fixedly connected to the fixed shaft, and the clamping plate cannot rotate relative to the fixed shaft; An unlocking component is connected to the rotating shaft and is rotatable about the axis of the rotating shaft. The bracket body and the unlocking component together can rotate around the axis of the fixed axis between the storage position and the unfolded position. When the bracket body is in the storage position, the unlocking component abuts and engages with the card plate, and the weight of the unlocking component helps to restrict the bracket body from rotating around the fixed axis. When it is necessary to change the bracket body from the stored position to the unfolded position, the unlocking component needs to be driven to overcome its own weight and rotate in the opposite direction around the rotation axis to disengage from the locking plate, so that the bracket body can rotate from the stored position to the unfolded position around the fixed axis.

2. The locking mechanism for the center armrest of a car seat as described in claim 1, characterized in that, The unlocking assembly includes a ratchet plate, an unlocking bracket, and an elastic element; The first end of the elastic element abuts against the unlocking bracket, and the second end of the elastic element abuts against the bracket body; When the bracket body is in the storage position, the elastic force of the elastic element acts on the unlocking bracket, causing the unlocking bracket to abut against the ratchet plate, thereby causing the ratchet plate to abut and engage with the locking plate, so as to lock the bracket body to rotate around the fixed axis.

3. The locking mechanism for the center armrest of a car seat as described in claim 2, characterized in that, Both the ratchet plate and the unlocking bracket are connected to the rotating shaft. The ratchet plate and the unlocking bracket are stacked together. The end of the unlocking bracket is provided with a protrusion, which acts on the outer wall surface of the ratchet plate.

4. The locking mechanism of the center armrest of a car seat as described in claim 3, characterized in that, The ratchet plate is provided with a groove, and the unlocking bracket is provided with a ratchet plate pin, which is inserted into the groove. The unlocking bracket is driven to rotate around the rotating shaft, which in turn causes the ratchet pin to move within the slot and drive the ratchet to rotate around the rotating shaft, thereby disengaging the ratchet from the locking plate. When the ratchet plate disengages from the latch plate, the bracket body unlocks relative to the latch plate, and the bracket body can rotate around the fixed axis, thereby changing from the stored position to the unfolded position.

5. The locking mechanism for the center armrest of a car seat as described in claim 4, characterized in that, The slot is a U-shaped slot; When the unlocking bracket is driven to rotate around the rotating shaft, the ratchet pin moves within the U-shaped groove and has a free stroke when moving within the first segment of the U-shaped groove. At this time, the movement of the ratchet pin does not drive the ratchet to rotate.

6. The locking mechanism for the center armrest of a car seat as described in claim 3, characterized in that, The unlocking bracket has a slot on one side near the protrusion, and a first limiting part is provided on the protrusion of the bracket body. The main body of the elastic element is sleeved on the rotating shaft. Wherein, the first end of the elastic element is embedded in the slot and fixed, and the second end of the elastic element is abutted against the first limiting part and fixed; When the unlocking bracket is driven to rotate around the rotating axis to disengage the ratchet plate from the locking plate, the first end and the second end of the elastic element move closer to each other, and the elastic element undergoes elastic deformation to store energy. When the ratchet plate and the locking plate abut and engage, the elastic element is released elastically, causing the unlocking bracket to rotate and reset around the rotating axis, and abutting against the outer wall surface of the ratchet plate through the protrusion.

7. The locking mechanism for the center armrest of a car seat as described in claim 2, characterized in that, The card plate is provided with a first card tooth, and correspondingly, the ratchet plate is provided with a locking part. The first card tooth includes a first arc-shaped surface and a first horizontal surface, and the locking part also includes a second arc-shaped surface and a second horizontal surface. When the card plate and the ratchet plate are locked together, the first arc-shaped surface abuts against the second arc-shaped surface, and the first horizontal surface abuts against the second horizontal surface.

8. The locking mechanism for the center armrest of a car seat as described in claim 7, characterized in that, An arc-shaped abutment is also provided on the side near the first horizontal plane. When the bracket body rotates from the unfolded position to the stored position, the arc-shaped abutment supports the second horizontal plane and abuts against the first horizontal plane.

9. The locking mechanism for the center armrest of a car seat as described in claim 7, characterized in that, The card plate is also provided with a second card tooth and a third card tooth, and a second limiting part is provided on the bracket body; When the bracket body is in the stowed position, the second locking tooth abuts against the second limiting part; when the bracket body is in the unfolded position, the third locking tooth abuts against the second limiting part, and the abutting surfaces of the second locking tooth and the third locking tooth are arranged facing each other.

10. The locking mechanism for the center armrest of a car seat as described in any one of claims 2-9, characterized in that, The bracket body includes a first support plate and a second support plate, and the card plate and the unlocking component are both sandwiched between the first support plate and the second support plate.

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