Automobile seat headrest adjusting mechanism

Abstract

The invention relates to an automobile seat headrest adjusting mechanism. The automobile seat headrest adjusting mechanism comprises a headrest rod, a headrest guide sleeve body, an unlocking button assembly and a locking PIN. The two headrest rods are inserted into the seat framework and extend upwards; the headrest guide sleeve body is arranged at the top end of the headrest rod in a sleeving manner; the unlocking button assembly is movably arranged at the top end of the headrest guide sleeve body and located on the outer side of the headrest guide sleeve body. The locking PIN is arranged in the unlocking button assembly, and in the locking state, one end of the locking PIN is inserted into the headrest rod. According to the scheme, the dual modes of manual adjustment and electric adjustment can be efficiently compatible, by means of perfect fusion of mechanical design and the electric control technology, rapidness and accuracy of height adjustment of the headrest are ensured, the adjustment efficiency and accuracy are improved, the structure is simple, operation is convenient and fast, stability is high, and practicability is high. And the requirements of the user on comfort, safety and convenience are met.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to an automotive seat headrest adjustment mechanism. Background Technology

[0002] Car seat headrests are comfort and safety components installed at the top of the seat back, corresponding to the position of the occupant's head. By supporting the head and neck, they reduce neck muscle fatigue during long-distance driving or riding, effectively alleviate damage to the cervical spine caused by violent back-and-forth swinging due to inertia, reduce the risk of cervical fractures, ligament sprains, and improve the integrity of the riding experience.

[0003] Most existing car seats have a folding function. To avoid interfering with this function, the headrest must be quickly lowered to its lowest position before folding the seat back. This prevents the headrest from interfering with the front seat or storage compartment, hindering the folding and affecting the user experience. Currently, the mainstream headrest adjustment method for car seats is manual. However, the existing structure is relatively complex, and manual adjustment is laborious, inaccurate, and time-consuming, failing to meet users' needs for convenience.

[0004] Therefore, there is an urgent need to design a car seat headrest adjustment mechanism that can efficiently accommodate both manual and electric adjustment modes. By perfectly integrating mechanical design and electric control technology, the mechanism ensures the speed and accuracy of headrest height adjustment, significantly improving adjustment efficiency and precision. Furthermore, it features a simple structure, convenient operation, and high stability, further meeting the modern car seat requirements for comfort, safety, and convenience. Summary of the Invention

[0005] To overcome the problems existing in related technologies, this application provides a car seat headrest adjustment mechanism that can efficiently accommodate both manual and electric adjustment modes. Through the perfect integration of mechanical design and electric control technology, it ensures the speed and accuracy of headrest height adjustment, significantly improving adjustment efficiency and precision. Moreover, it has a simple structure, is easy to operate, and has high stability, further meeting the needs of modern car seats for comfort, safety, and convenience.

[0006] This application provides a car seat headrest adjustment mechanism, including a headrest rod, a headrest guide sleeve body, an unlocking button assembly, and a locking PIN; two headrest rods are inserted into the seat frame and extend upwards; the headrest guide sleeve body is sleeved on the top end of the headrest rod; the unlocking button assembly is movably disposed on the top end of the headrest guide sleeve body and located outside the headrest guide sleeve body, for driving the locking PIN to move; the locking PIN is disposed in the unlocking button assembly, and in the locked state, one end of the locking PIN is inserted into the headrest rod.

[0007] In a preferred embodiment of this application, the unlocking button assembly includes a button body, a through hole, a slot, and a locking button spring. The button body is inserted into one side of the headrest guide sleeve body and can reciprocate in a direction perpendicular to the headrest rod. The through hole is disposed on the button body and located at the headrest rod, and the cross-sectional area of ​​the through hole is larger than the cross-sectional area of ​​the headrest rod. The slot is disposed at the bottom of the button body and corresponds to the locking groove on the headrest rod, so that the locking PIN located in the slot can be inserted into or moved away from the locking groove with the reciprocating movement of the button body. The locking button spring is symmetrically disposed at one end of the button body, and one end of the locking button spring is fixed to the headrest guide sleeve body, and the other end is fixed to the button body.

[0008] In a preferred embodiment of this application, a limiting surface and a stop point are further included; the limiting surface is disposed on the unlocking button assembly to limit the unlocking stroke of the unlocking button assembly; one end of the stop point is disposed on the unlocking button assembly, and the other end is limited within the groove of the headrest guide sleeve body to limit the reset stroke of the unlocking button assembly.

[0009] In a preferred embodiment of this application, the device further includes an unlocking pivot and an electric drive assembly; the unlocking pivot is rotatably mounted on the headrest guide sleeve body and is used to drive the unlocking button assembly to reciprocate; the electric drive assembly is located at one end of the unlocking pivot and is used to drive the unlocking pivot to rotate.

[0010] In a preferred embodiment of this application, the unlock button assembly is provided with a drive hole, the cross-sectional area of ​​which is larger than the cross-sectional area of ​​the unlocking shaft; the unlocking shaft passes through the drive hole and extends upward, and in the locked state, the gap between one end of the unlocking shaft and the wall of the drive hole is greater than the travel distance of the unlock button assembly.

[0011] In a preferred embodiment of this application, the unlocking shaft is V-shaped in general and specifically includes a first shaft and a second shaft; the first shaft is connected to the electric drive assembly; the second shaft passes through the drive hole and extends upward, and one side of the second shaft abuts against the wall of the drive hole, while the other opposite side has a gap distance with the wall of the drive hole.

[0012] In a preferred embodiment of this application, the electric drive assembly includes a cable and a drive motor; the cable includes a cable end and a cable body; the cable end is disposed in the cable groove of the unlocking shaft; one end of the cable body is connected to the cable end, the other end is connected to the drive motor, and the movement direction of the cable body is perpendicular to the unlocking shaft connected to it.

[0013] In a preferred embodiment of this application, the unlocking pivot is further provided with a cylinder; the headrest guide sleeve body is provided with an arc groove and a limiting point; the cylinder is rotatably disposed in the arc groove; and the limiting point is disposed at one end of the arc groove.

[0014] In a preferred embodiment of this application, a reset torsion spring is also included; a mounting post is provided on the headrest guide sleeve body; the reset torsion spring is sleeved on the mounting post, and one end of the reset torsion spring is hung on the unlocking pivot, while the other end is snapped onto the headrest guide sleeve body.

[0015] In a preferred embodiment of this application, the unlocking pivot is provided with a mounting hole, and the unlocking pivot is limited to the headrest guide sleeve body by means of a bolt assembly passing through the mounting hole.

[0016] The technical solution provided in this application has the following beneficial effects:

[0017] (1) The car seat headrest adjustment mechanism provided in this application includes a headrest rod, a headrest guide sleeve body, an unlocking button assembly, and a locking PIN. By setting a locking PIN in a slot within the button body and a matching locking groove on the headrest rod, the locking PIN can disengage from or insert into the locking groove under the action of the button body, thereby achieving unlocking or locking functions. A locking button spring is provided at one end of the button body, allowing the locking PIN to be easily reset in the locking groove by the spring's rebound force, returning to its initial locked state. Compared to existing technologies, the car seat headrest adjustment mechanism of this application can quickly and accurately adjust the headrest height when needed to meet requirements such as seat backrest flipping, and it features a simple structure, convenient operation, and high stability.

[0018] (2) By adding an electric drive assembly and an unlocking shaft, and cleverly combining mechanical design and advanced electric control technology, when the headrest height needs to be quickly adjusted, the electric drive assembly is activated, driving the unlocking shaft to rotate. This causes the unlocking button assembly (button body and locking PIN) to move to the left, moving the PIN away from the locking groove and presenting an unlocked state, thus facilitating quick and precise adjustment of the headrest. Then, through the combined use of the return torsion spring and the locking button spring, the unlocking button assembly (button body and locking PIN) is moved to the right, causing the PIN to insert into the locking groove and return to the initial locked state, thereby automatically realizing the unlocking and locking functions. At the same time, by setting up structures such as the return torsion spring, the arc groove, and the limit point, the stability and reliability of the unlocking and locking actions are improved.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0020] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0021] Figure 1 This is a schematic diagram of the structure of the car seat headrest adjustment mechanism shown in the embodiments of this application;

[0022] Figure 2 This is a top view schematic diagram of the unlock button component shown in an embodiment of this application;

[0023] Figure 3 This is another top view schematic diagram of the unlock button assembly shown in the embodiments of this application;

[0024] Figure 4 This is a cross-sectional schematic diagram of an automotive seat headrest adjustment mechanism shown in an embodiment of this application;

[0025] Figure 5 This is another structural schematic diagram of the car seat headrest adjustment mechanism shown in the embodiments of this application;

[0026] Figure 6 This is another structural schematic diagram of the car seat headrest adjustment mechanism shown in the embodiments of this application;

[0027] Figure 7 This is another cross-sectional schematic diagram of the car seat headrest adjustment mechanism shown in the embodiments of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Headrest rod; 11. Locking groove; 2. Headrest guide sleeve body; 21. Arc slide groove; 22. Limiting point; 23. Mounting post; 3. Unlocking button assembly; 31. Button body; 32. Through hole; 33. Slot; 34. Locking button spring; 35. Guide post; 36. Limiting surface; 37. Stop point; 38. Drive hole; 4. Locking PIN; 5. Unlocking pivot; 51. First pivot; 52. Second pivot; 53. Cylinder; 6. Electric drive assembly; 61. Cable end; 62. Cable body; 7. Gap distance; 8. Return torsion spring; 9. Bolt assembly. Detailed Implementation

[0030] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0031] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0032] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] Most existing car seats have a folding function. To avoid interfering with this function, the headrest must be quickly lowered to its lowest position before folding the seat back. This prevents the headrest from interfering with the front seat or storage compartment, hindering the folding and affecting the user experience. Currently, the mainstream headrest adjustment method for car seats is manual. However, the existing structure is relatively complex, and manual adjustment is laborious, inaccurate, and time-consuming, failing to meet users' needs for convenience.

[0034] To address the aforementioned issues, this application provides a car seat headrest adjustment mechanism that efficiently accommodates both manual and electric adjustment modes. Through the perfect integration of mechanical design and electric control technology, it ensures the speed and accuracy of headrest height adjustment, significantly improving adjustment efficiency and precision. Furthermore, it features a simple structure, convenient operation, and high stability, further meeting the modern car seat's demands for comfort, safety, and convenience.

[0035] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] Please see Figures 1-7 The automotive seat headrest adjustment mechanism of this application includes a headrest rod 1, a headrest guide sleeve body 2, an unlocking button assembly 3, and a locking PIN 4. Two headrest rods 1 are inserted into the seat frame and extend upwards to support the headrest portion. The headrest guide sleeve body 2 is fitted onto the top of the headrest rod 1, and a headrest guide sleeve cover is fitted onto the headrest guide sleeve body 2 for decoration and fixation. The unlocking button assembly 3 is movably disposed at the top of the headrest guide sleeve body 2 and located on the outer side of the headrest guide sleeve body 2 (referred to as the locking side). It is used to move the locking PIN 4. The locking PIN 4 is disposed within the unlocking button assembly 3, and in the locked state, one end of the locking PIN 4 is inserted into the headrest rod 1. The user can operate the unlocking button assembly 3 to move the locking PIN 4, thereby achieving unlocking and locking functions to adjust the headrest height. It should be noted that, in order to facilitate the movement of the unlocking button assembly 3, the locking side of the headrest guide cover is provided with an opening.

[0038] Specifically, the unlocking button assembly 3 includes a button body 31, a through hole 32, and a slot 33. The button body 31 is inserted into one side of the headrest guide sleeve body 2 and can reciprocate in a direction perpendicular to the headrest rod 1 under the action of external force (i.e., the button body 31 can move left and right). The through hole 32 is provided on the button body and located at the headrest rod 1, so that the button body 32 can be fitted onto the headrest rod 1, and the cross-sectional area of ​​the through hole 32 is larger than the cross-sectional area of ​​the headrest rod 1, which facilitates the movement of the button body 31. The slot 33 is opened at the bottom of the button body 31 and corresponds to the locking groove 11 on the headrest rod 1, so that the locking PIN4 located in the slot 33 can be inserted into or moved away from the locking groove 11 with the reciprocating movement of the button body 31. If the initial state is the locked state, the locking PIN4 is inserted into the locking groove 11 (i.e., one end of the locking PIN4 is located inside the headrest rod 1), which can effectively prevent the headrest guide sleeve body 2 from moving up and down relative to the headrest rod 1. When the button body 31 is pressed (i.e., the button body 31 moves to the left), the slot 33 can drive the locking PIN4 to move to the left together, so that the locking PIN4 is disengaged from the locking groove 11 and is in the unlocked state, which facilitates the subsequent adjustment of the headrest height.

[0039] Furthermore, to facilitate the reset of the locking PIN4, the unlocking button assembly 3 also includes a locking button spring 34. The locking button spring 34 is symmetrically arranged at one end of the button body 31 to provide a reset force to the button body 31, enabling the button body 31 to automatically reset to its initial state when not subjected to external force. Specifically, one end of the button body 31 is provided with a guide post 35, and two guide posts 35 are symmetrically arranged on the button body 31. The locking button spring 34 is sleeved on the guide post 35, and one end of the locking button spring 34 is fixed to the headrest guide sleeve body 2, while the other end is fixed to the button body 31. When the locking button spring 34 is in its natural state, the length of the locking button spring 34 is greater than the length of the guide post 35.

[0040] Furthermore, the car seat headrest adjustment mechanism also includes a limiting surface 36 and a stop point 37. The limiting surface 36 is disposed on the unlocking button assembly 3 to limit the unlocking stroke of the unlocking button assembly 3. One end of the stop point 37 is disposed on the unlocking button assembly 3, and the other end is limited within the groove of the headrest guide sleeve body 2 to limit the reset stroke of the unlocking button assembly 3. By setting the limiting surface 36 and the stop point 37, the stroke of the unlocking button assembly 3 is precisely controlled, ensuring that the unlocking button assembly 3 moves within its normal operating range and preventing excessive movement of the unlocking button assembly 3 from damaging the mechanism.

[0041] Working principle:

[0042] When the headrest height needs to be adjusted (e.g., to the lowest position), simply press the button body 31. This moves the button body 31 to the left, causing the locking PIN4 to move accordingly. The locking PIN4 then disengages from the locking groove 11, switching from the locked to the unlocked state. After unlocking, the headrest guide sleeve 2, under the tension of the bottom constant force spring and its own weight, quickly descends to the lowest position, thus completing the rapid adjustment of the headrest. During this process, the locking button spring 34 is compressed. When the headrest is adjusted to the preset position, releasing the button body 31 causes the button body 31 to move to the right under the rebound force of the locking button spring 34. This causes the locking PIN4 to insert into the locking groove 11 of the headrest rod 1, returning to the initial locked state.

[0043] In this first embodiment, the car seat headrest adjustment mechanism provided by this application includes a headrest rod, a headrest guide sleeve body, an unlocking button assembly, and a locking PIN. By setting the locking PIN in a slot within the button body and providing a matching locking groove on the headrest rod, the locking PIN can disengage from or insert into the locking groove under the action of the button body, thereby achieving unlocking or locking functions. A locking button spring is provided at one end of the button body, allowing the locking PIN to be easily reset in the locking groove by the spring's rebound force, returning to the initial locked state. Compared to existing technologies, the car seat headrest adjustment mechanism of this application can quickly and accurately adjust the headrest height when needed to meet requirements such as seat backrest flipping, and it features a simple structure, convenient operation, and high stability.

[0044] Example 2

[0045] Currently, most car seat headrests are manually adjustable. However, this method is complex, laborious, inaccurate, and time-consuming, making it difficult to quickly lower the headrest to its lowest position. To address these issues, this application proposes a solution. Please refer to [link to relevant documentation]. Figures 1-7 Specifically:

[0046] Based on the structure of Embodiment 1 above, the car seat headrest adjustment mechanism provided in Embodiment 2 of this application further includes an unlocking pivot 5 and an electric drive assembly 6. The unlocking pivot 5 is rotatably mounted on the headrest guide sleeve body 2 and is used to drive the unlocking button assembly 3 to reciprocate. The electric drive assembly 6 is located at one end of the unlocking pivot 5 and is connected to the unlocking pivot 5 in a transmission manner. It is used to drive the unlocking pivot 5 to rotate, thereby driving the unlocking button assembly 3 to move, realizing automatic unlocking and locking of the headrest. Furthermore, in order to prevent the unlocking pivot 5 from detaching from the headrest guide sleeve body 2, the unlocking pivot 5 is provided with a mounting hole, and the unlocking pivot 5 is limited to the headrest guide sleeve body 2 by a bolt assembly 9 passing through the mounting hole.

[0047] Specifically, the unlock button assembly 3 is provided with a drive hole 38, and the unlocking shaft 5 passes through the drive hole 38 and extends upward. Further, the cross-sectional area of ​​the drive hole 38 is larger than the cross-sectional area of ​​the unlocking shaft 5, so that the unlocking shaft 5 can rotate smoothly within the drive hole 38. For example, in the locked state, the gap distance 7 between one end of the unlocking shaft 5 and the wall of the drive hole 38 is greater than the travel distance of the unlock button assembly 3. Figure 3As shown, when in the locked state, let the gap distance 7 be D1 and the travel distance of the unlock button assembly 3 be D2. Then, D1-D2>0. This ensures that the unlocking shaft 5 can rotate smoothly within the drive hole 38, while effectively preventing the unlocking button assembly 3 from driving the unlocking shaft 5 to rotate when the gap distance 7 is less than or equal to the travel distance.

[0048] More specifically, the unlocking pivot 5 includes a first pivot 51 and a second pivot 52. The first pivot 51 and the second pivot 52, when connected, form a V-shape. For example, the headrest guide sleeve body 2 also has a rotating shaft. The connection point of the first pivot 51 and the second pivot 52 is fitted onto the rotating shaft to reduce frictional resistance during rotation of the unlocking pivot 5, improving the smoothness and stability of rotation. The first pivot 51 is connected to the electric drive assembly 6, which includes a cable and a drive motor. One end of the cable is connected to the first pivot 51, and the other end is connected to the output shaft of the drive motor. The drive motor drives the cable to tighten, thereby causing the first pivot 51 and the second pivot 52 to rotate around the rotating shaft. The second pivot 52 then drives the unlocking button assembly 3 to move on the headrest guide sleeve body 2, thus unlocking the headrest.

[0049] For example, the cable includes a cable end 61 and a cable body 62. The cable end 61 is disposed in the cable groove of the unlocking shaft 5. One end of the cable body 62 is connected to the cable end 61, and the other end is connected to the drive motor. The movement direction of the cable body 62 is perpendicular to the unlocking shaft 5 (i.e., the first shaft 51) connected to it. The second shaft 52 passes through the drive hole 38 and extends upward. One side of the second shaft 52 abuts against the hole wall of the drive hole 38, and a gap distance 7 is provided between the other side and the hole wall of the drive hole 38. When the headrest needs to be automatically unlocked, the drive motor rotates forward, driving the first shaft 51 to rotate via the cable, thereby driving the second shaft 52 to rotate around the rotation axis. Since one side of the second rotating shaft 52 abuts against the wall of the driving hole 38, the rotation of the second rotating shaft 52 can be converted into the left and right movement of the unlocking button assembly 3. Therefore, as the second rotating shaft 52 rotates, the unlocking button assembly 3 will be pushed to the left, thereby driving the locking PIN 4 to move to the left, thus unlocking the headrest. After unlocking, the headrest guide sleeve body 2 quickly descends to the lowest position under the tension of the bottom constant force spring and its own gravity.

[0050] Furthermore, to achieve automatic locking, the car seat headrest adjustment mechanism also includes a return torsion spring 8. Specifically, the headrest guide sleeve body 2 is provided with a mounting post 23; the return torsion spring 8 is sleeved on the mounting post 23, and one end of the return torsion spring 8 is hung on the unlocking shaft 5, while the other end is engaged with the headrest guide sleeve body 2. It should be noted that when in the locked state, the return torsion spring 8 is in a warning state, and when in the unlocked state, the return torsion spring 8 is in a compressed state. That is, when automatic locking is required, the drive motor reverses, releasing the tension of the cable on the first shaft 51. At this time, the rebound force of the return torsion spring 8 drives the second shaft 52 to rotate in the opposite direction, thereby releasing the thrust of the second shaft 52 on the button body 31. Under the action of the rebound force of the locking button spring 34, the locking PIN 4 is inserted into the locking groove 11 of the headrest rod 1, thereby locking the headrest.

[0051] Furthermore, to improve the stability of the unlocking and locking actions, the unlocking shaft 5 is also provided with a cylinder 53, and the headrest guide sleeve body 2 is provided with an arc-shaped groove 21 and a limiting point 22. The cylinder 53 is rotatably disposed within the arc-shaped groove 21, and the limiting point 22 is disposed at one end of the arc-shaped groove 21. When unlocking, the cylinder 53 moves within the arc-shaped groove 21 as the unlocking shaft 5 rotates; when locking, the unlocking shaft 5 rotates back under the push of the rebound force of the return torsion spring 8 until the cylinder 53 abuts against the stop point 37, thereby effectively limiting the rotational stroke of the unlocking shaft 5. By setting the arc-shaped groove 21 and the limiting point 22, the rotational stroke of the unlocking shaft 5 is precisely controlled, ensuring that the unlocking shaft 5 rotates within its normal operating range and preventing excessive rotation of the unlocking shaft 5 from damaging the mechanism. In addition, the arc-shaped groove 21 also provides a guiding function, making the unlocking shaft 5 more stable during rotation.

[0052] Working principle:

[0053] When unlocking is required, the drive motor rotates forward, tightening the cable and causing the first rotating shaft 51 and the second rotating shaft 52 to rotate around the rotation axis. Since one side of the second rotating shaft 52 abuts against the wall of the drive hole 38, the unlocking button assembly 3 will be pushed to the left as the second rotating shaft 52 rotates, thereby causing the locking PIN 4 to move to the left, disengaging the locking PIN 4 from the locking groove 11 of the headrest rod 1, thus unlocking the headrest. During the unlocking process, as the first rotating shaft 51 and the second rotating shaft 52 rotate around the rotation axis, the cylinder 53 moves within the arc-shaped sliding groove 21, and simultaneously, the reset torsion spring 8 changes from the warning state to the compressed state. After unlocking, the headrest guide sleeve body 2 quickly descends to its lowest position under the tension of the bottom constant force spring and its own gravity.

[0054] When automatic locking is required, the drive motor reverses, releasing the tension of the cable on the first rotating shaft 51. At this time, the rebound force of the reset torsion spring 8 drives the second rotating shaft 52 to rotate in the opposite direction, releasing the thrust of the second rotating shaft 52 on the button body 31. Then, under the action of the rebound force of the locking button spring 34, the button body 31 is pushed to the right, causing the locking PIN4 to move to the right, thereby allowing the locking PIN4 to be inserted into the locking groove 11 of the headrest rod 1, thus locking the headrest.

[0055] In Embodiment 2 of this application, the automotive seat headrest adjustment mechanism further includes an unlocking pivot and an electric drive assembly. By adding the electric drive assembly and the unlocking pivot, and cleverly combining mechanical design and advanced electric control technology, when a quick adjustment of the headrest height is needed, the electric drive assembly is activated to drive the unlocking pivot to rotate, thereby moving the unlocking button assembly (button body and locking PIN) to the left, causing the PIN to move away from the locking groove and enter the unlocked state, thus facilitating quick and precise headrest adjustment. Then, through the combined use of the return torsion spring and the locking button spring, the unlocking button assembly (button body and locking PIN) is moved to the right, causing the PIN to insert into the locking groove and return to the initial locked state, thereby automatically realizing the unlocking and locking functions. Simultaneously, by setting up structures such as the return torsion spring, the arc-shaped sliding groove, and the limiting point, the stability and reliability of the unlocking and locking actions are improved. Compared with existing technologies, the car seat headrest adjustment mechanism of this application can efficiently accommodate both manual and electric adjustment modes. Through the perfect integration of mechanical design and electric control technology, it ensures the speed and accuracy of headrest height adjustment, significantly improving adjustment efficiency and precision. Moreover, it has a simple structure, is easy to operate, and has high stability, further meeting the needs of modern car seats for comfort, safety, and convenience.

[0056] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A car seat headrest adjustment mechanism, characterized in that, Includes a headrest rod (1), a headrest guide sleeve body (2), an unlock button assembly (3), and a locking PIN (4); The two headrest rods (1) are inserted into the seat frame and extend upward; The headrest guide sleeve body (2) is sleeved on the top end of the headrest rod (1); The unlock button assembly (3) is movably disposed at the top of the headrest guide sleeve body (2) and located on the outside of the headrest guide sleeve body (2), for driving the locking PIN (4) to move; The locking PIN (4) is located within the unlocking button assembly (3), and in the locked state, one end of the locking PIN (4) is inserted into the headrest bar (1).

2. The car seat headrest adjustment mechanism according to claim 1, characterized in that, The unlock button assembly (3) includes a button body (31), a through hole (32), a slot (33), and a locking button spring (34); The button body (31) is inserted into one side of the headrest guide sleeve body (2) and can reciprocate in a direction perpendicular to the headrest rod (1); The through hole (32) is provided on the button body (31) and located at the headrest rod (1), and the cross-sectional area of ​​the through hole (32) is greater than the cross-sectional area of ​​the headrest rod (1); The slot (33) is located at the bottom of the button body (31) and corresponds to the locking slot (11) on the headrest rod (1), so that the locking PIN (4) located in the slot (33) can be inserted into or moved away from the locking slot (11) as the button body (31) reciprocates. The locking button spring (34) is symmetrically arranged at one end of the button body (31), and one end of the locking button spring (34) is fixed on the headrest guide sleeve body (2), and the other end is fixed on the button body (31).

3. The car seat headrest adjustment mechanism according to claim 1, characterized in that, The unlock button assembly (3) further includes a limiting surface (36) and a stop point (37); The limiting surface (36) is disposed on the unlock button assembly (3) to limit the unlocking stroke of the unlock button assembly (3); One end of the stop (37) is disposed on the unlock button assembly (3), and the other end is limited in the groove of the headrest guide body (2) to limit the reset stroke of the unlock button assembly (3).

4. The car seat headrest adjustment mechanism according to claim 1, characterized in that, It also includes an unlocking hinge (5) and an electric drive assembly (6); The unlocking pivot (5) is rotatably mounted on the headrest guide sleeve body (2) and is used to drive the unlocking button assembly (3) to reciprocate. The electric drive assembly (6) is disposed at one end of the unlocking shaft (5) and is used to drive the unlocking shaft (5) to rotate.

5. The car seat headrest adjustment mechanism according to claim 4, characterized in that, The unlock button assembly (3) is provided with a drive hole (38), and the cross-sectional area of ​​the drive hole (38) is larger than the cross-sectional area of ​​the unlock rotating shaft (5); The unlocking pivot (5) passes through the drive hole (38) and extends upward. In the locked state, the gap distance (7) between one end of the unlocking pivot (5) and the hole wall of the drive hole (38) is greater than the travel distance of the unlocking button assembly (3).

6. The automotive seat headrest adjustment mechanism according to claim 5, characterized in that, The unlocking hinge (5) is V-shaped in general, and specifically includes a first hinge (51) and a second hinge (52); The first rotating shaft (51) is connected to the electric drive assembly (6); The second rotating shaft (52) passes through the drive hole (38) and extends upward, and one side of the second rotating shaft (52) abuts against the hole wall of the drive hole (38), while the other opposite side is provided with a gap distance (7) between it and the hole wall of the drive hole (38).

7. The car seat headrest adjustment mechanism according to claim 4, characterized in that, The electric drive assembly (6) includes a cable and a drive motor; The cable includes a cable end (61) and a cable body (62); The cable end (61) is disposed in the cable groove of the unlocking shaft (5); One end of the cable (62) is connected to the cable end (61), and the other end is connected to the drive motor. The direction of movement of the cable (62) is perpendicular to the unlocking shaft (5) connected to it.

8. The car seat headrest adjustment mechanism according to claim 4, characterized in that, The unlocking pivot (5) is also provided with a cylinder (53); The headrest guide sleeve body (2) is provided with an arc groove (21) and a limiting point (22); The cylinder (53) is rotatably disposed within the arc groove (21); The limiting point (22) is located at one end of the arc groove (21).

9. The car seat headrest adjustment mechanism according to claim 4, characterized in that, It also includes a reset torsion spring (8); The headrest guide sleeve body (2) is provided with mounting posts (23); The reset torsion spring (8) is sleeved on the mounting post (23), and one end of the reset torsion spring (8) is hung on the unlocking shaft (5), while the other end is snapped onto the headrest guide sleeve body (2).

10. The automobile seat headrest adjustment mechanism according to claim 4, characterized in that, The unlocking pivot (5) is provided with a mounting hole, and the unlocking pivot (5) is limited to the headrest guide sleeve body (2) by passing a bolt assembly (9) through the mounting hole.

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