Four-way adjustable headrest movement mechanism

Abstract

The application discloses a four-way adjusting headrest movement mechanism, which comprises a mechanism framework, a headrest rod, a front-back movement support assembly and a guide piece. The mechanism framework is movably connected to the headrest rod to realize up-down movement adjustment of the mechanism framework relative to the headrest rod. The front-back movement support assembly is movably connected to the mechanism framework to realize front-back movement adjustment of the front-back movement support assembly relative to the mechanism framework. The guide piece is arranged at the connection between the headrest rod and the mechanism framework and / or the connection between the front-back movement support assembly and the mechanism framework. The guide piece is used for reducing the movement gap between the headrest rod and the mechanism framework and / or the movement gap between the front-back movement support assembly and the mechanism framework.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and more specifically to a four-way adjustable headrest movement mechanism. Background Technology

[0002] Currently, in car seats, office chairs, and other seating products, headrests are key components ensuring neck comfort and safety, and the flexibility and stability of their adjustment function directly affect the user experience. As users' demands for seat comfort increase, adjustable headrests are gradually becoming the mainstream design, reducing neck fatigue by meeting the needs of users of different heights and sitting postures.

[0003] Existing adjustable headrest motion mechanisms typically include core components such as headrest rods and a support frame for support and connection. The headrest rods and the support frame work together to adjust the headrest to different heights. However, in practical applications, the assembly of the various components in this type of motion mechanism will produce certain assembly tolerances, and a certain movement gap will occur when the support frame moves relative to the headrest rods.

[0004] The presence of movement gaps can cause relative displacement or vibration of components when subjected to force. The headrest rod may sway left and right or back and forth within the mechanism frame, which may lead to collisions or friction noises between components.

[0005] Therefore, how to avoid the shaking and abnormal noise generated during the headrest adjustment process has become an urgent problem to be solved by existing adjustable headrest movement mechanisms. Utility Model Content

[0006] The purpose of this application is to provide a four-way adjustable headrest movement mechanism to solve the problems of shaking and abnormal noise generated during the headrest adjustment process.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: A four-way adjustable headrest movement mechanism is provided, comprising: a mechanism frame; a headrest rod, wherein the mechanism frame is movably connected to the headrest rod to achieve vertical adjustment of the mechanism frame relative to the headrest rod; a front and rear movement support assembly, wherein the front and rear movement support assembly is movably connected to the mechanism frame to achieve front and rear movement adjustment of the front and rear movement support assembly relative to the mechanism frame; and a guide member, wherein the guide member is disposed at the connection between the headrest rod and the mechanism frame, and / or at the connection between the front and rear movement support assembly and the mechanism frame; wherein the guide member is used to reduce the movement gap between the headrest rod and the mechanism frame, and / or reduce the movement gap between the front and rear movement support assembly and the mechanism frame.

[0008] As a preferred embodiment, the guide includes a first guide block disposed at the connection between the mechanism frame and the headrest rod; the first guide block includes a first guide block body and a first elastic member, the first guide block body is connected to the mechanism frame, and the first guide block body has a through hole for the headrest rod to pass through; the first elastic member is connected to the first guide and is positioned on the inner wall of the through hole in the first guide block, and the protrusion of the first elastic member is used to achieve radial compression and limiting of the headrest rod.

[0009] As another preferred embodiment, multiple first guide blocks are provided, and each of the multiple first guide blocks is provided at the connection between the mechanism frame and the headrest rod, and the multiple first guide blocks are arranged at intervals along the axial movement direction of the headrest rod.

[0010] Further preferably, the first elastic element includes a support portion and a plurality of spring pieces fixedly connected to the support portion. The support portion is used to connect with the inner wall of the first guide block body. The plurality of spring pieces are circumferentially spaced around the support portion, and the spring pieces protrude toward the center of the through hole opened in the first guide block body. When the headrest rod passes through the through hole opened in the first guide block body and connects with the mechanism frame, the plurality of spring pieces radially elastically abut against the outer wall surface of the headrest rod.

[0011] More preferably, the supporting part is an arc-shaped ring structure with an opening on one side.

[0012] In a further preferred embodiment, the outer wall of the first guide block is provided with a first engaging member, and an opening is provided on the corresponding mechanism frame, so that the first engaging member can be fastened into the opening to realize the connection between the first guide block and the mechanism frame.

[0013] Preferably, the outer wall of the first guide block is further provided with reinforcing ribs, and a limiting protrusion is provided on one side corresponding to the mechanism frame; wherein, when the first guide block is engaged with the opening through the first engaging member, the reinforcing ribs and the limiting protrusion abut against each other.

[0014] Preferably, when the first guide block is fastened to the mechanism frame along the axial direction of the headrest rod, the reinforcing rib and the limiting protrusion form a progressive abutment fit; wherein, the reinforcing rib has a gradually changing protrusion height along the fastening direction, with its initial end height being less than its final end height, so that during the fastening process, the initial end of the reinforcing rib preferentially contacts the limiting protrusion, and guides the limiting protrusion to slide to the end of the reinforcing rib as the fastening process progresses, ultimately forming a complete limit.

[0015] Preferably, the guide member includes a second guide block, which is disposed at the connection between the mechanism frame and the front and rear motion support assembly; the second guide block includes a second guide block body and a second elastic member, the second guide block body is connected to the mechanism frame, and the second guide block body has a through hole for the front and rear motion support assembly to pass through; the second elastic member is connected to the second guide member, and the second elastic member is located on the inner wall of the through hole in the second guide block, and the radial compression and limiting of the headrest rod is achieved by the protrusion of the second elastic member.

[0016] Preferably, the outer wall of the second guide block is provided with a boss, and a second engaging member is provided on the corresponding mechanism frame. When the second guide block is assembled with the mechanism frame along the moving direction of the front and rear moving bracket assembly, the second engaging member is engaged into the boss to realize the connection between the second guide block and the mechanism frame.

[0017] Compared with the prior art, the beneficial effects of this application are as follows:

[0018] The guide component serves the same purpose in both the headrest rod and the front and rear motion support assembly. Therefore, taking the guide component located on the headrest rod as an example, the guide component transforms the vertical movement of the mechanism frame relative to the headrest rod into the vertical movement of the mechanism frame relative to the guide component. In other words, the direct contact between the headrest rod and the mechanism frame is transformed into indirect contact between the headrest rod and the mechanism frame, and direct contact between the headrest rod and the guide component. The guide component directly fills the gap between the headrest rod and the mechanism frame, thereby effectively solving the common problems of poor movement and shaking noise in the headrest rod and the front and rear motion support assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the four-way adjustable headrest mechanism;

[0020] Figure 2 This is a schematic diagram of the four-way adjustable headrest motion mechanism excluding the mechanism frame;

[0021] Figure 3 This is a side sectional view of the headrest bar location;

[0022] Figure 4 A structural schematic diagram showing the assembly position of the first guide block and the mechanism frame;

[0023] Figure 5 This is a structural diagram showing the assembly position of the second guide block with the mechanism frame.

[0024] Figure 6 This is a schematic diagram of the structure of the first guide block;

[0025] Figure 7 This is a schematic diagram of the second guide block;

[0026] Figure 8 This is a schematic diagram of the structure of the first elastic element.

[0027] In the diagram: 1. Four-way adjustable headrest movement mechanism; 10. Mechanism frame; 11. Opening; 12. Limiting protrusion; 13. Second engaging component; 14. First inclined surface; 20. Headrest rod; 30. Front and rear movement support assembly; 40. Guide component; 41. First guide block; 411. First guide block body; 412. First elastic component; 413. Bearing part; 414. Spring piece; 415. First engaging component; 416. Reinforcing rib; 417. Starting end; 418. Ending end; 42. Second guide block; 421. Second guide block body; 422. Second elastic component; 423. Boss; 424. Second inclined surface; 50. First drive motor; 60. Second drive motor. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] In a preferred embodiment, see Figures 1 to 5This application provides a four-way adjustable headrest movement mechanism 1, comprising: a mechanism frame 10; a headrest rod 20, the mechanism frame 10 being movably connected to the headrest rod 20 to achieve vertical adjustment of the mechanism frame 10 relative to the headrest rod 20; a front and rear movement support assembly 30, the front and rear movement support assembly 30 being movably connected to the mechanism frame 10 to achieve front and rear movement adjustment of the front and rear movement support assembly 30 relative to the mechanism frame 10; and a guide member 40, the guide member 40 being disposed at the connection between the headrest rod 20 and the mechanism frame 10, and / or at the connection between the front and rear movement support assembly 30 and the mechanism frame 10; wherein, the guide member 40 is used to reduce the movement gap between the headrest rod 20 and the mechanism frame 10, and / or reduce the movement gap between the front and rear movement support assembly 30 and the mechanism frame 10.

[0033] The four-way adjustable headrest movement mechanism 1 in this application refers to the four directions: front, back, left, and right. Specifically, it is achieved through the front and back movement of the front and back movement support assembly 30 relative to the mechanism frame 10. Figure 1 The movement along the Y-axis is such that the frame 10 can move vertically relative to the headrest rod 20. Figure 1 Movement in the Z-axis direction. A first drive motor 50 is installed inside the mechanism frame 10, which drives the mechanism frame 10 to move up and down along the headrest rod 20 for adjustment. Similarly, a second drive motor 60 is installed on the side of the mechanism frame 10, which drives the front and rear movement bracket assembly 30 to move and adjust in the front and rear direction relative to the mechanism frame 10. The four-way adjustable headrest movement mechanism 1 is covered with adaptive materials, such as the front and rear movement bracket assembly 30 external neck support frame, which is covered with neck support foam and neck support cover. The headrest rod 20 can be externally connected to an upper frame for support, which is covered with front foam and front cover. The back of the mechanism frame 10 is covered with a back cover plate to form a complete headrest structure to provide comfortable support for customers. A speaker can also be installed inside the headrest.

[0034] In a typical assembly configuration, the first drive motor 50 extends its drive shaft and connects to the top of the headrest rod 20. The rotation of the drive shaft drives the mechanism frame 10 to move up and down relative to the headrest rod 20. The headrest rod 20 serves as a support and acts as a track. The front and rear motion support assembly 30 works similarly to the headrest rod 20. Therefore, during assembly, the headrest rod 20 and the front and rear motion support assembly 30 need to pass through the mechanism frame 10 along their respective axial directions. At this time, the guide member 40 is assembled at the end of the connection between the headrest rod 20 and the mechanism frame 10, and / or the connection between the front and rear motion support assembly 30 and the mechanism frame 10.

[0035] Preferably, in this embodiment, the guide member 40 is provided at both the headrest rod 20 and the front and rear movement bracket assembly 30, and the guide member 40 plays the same role at both locations. Therefore, taking the guide member 40 provided at the headrest rod 20 as an example, the provision of the guide member 40 can transform the vertical movement of the mechanism frame 10 relative to the headrest rod 20 into the actual vertical movement of the mechanism frame 10 relative to the guide member 40. That is, the direct contact between the headrest rod 20 and the mechanism frame 10 is transformed into indirect contact between the headrest rod 20 and the mechanism frame 10 by providing the guide member 40. The direct contact between the headrest rod 20 and the guide member 40 directly fills the gap between the headrest rod 20 and the mechanism frame 10, thereby effectively solving the common problems of poor movement and shaking noise between the headrest rod 20 and the front and rear movement bracket assembly 30.

[0036] As a preferred option, see Figure 4 , Figure 6 and Figure 8 The guide member 40 includes a first guide block 41, which is disposed at the connection between the mechanism frame 10 and the headrest rod 20. The first guide block 41 includes a first guide block body 411 and a first elastic member 412. The first guide block body 411 is connected to the mechanism frame 10 and has a through hole for the headrest rod 20 to pass through. The first elastic member 412 is connected to the first guide member 40 and is located on the inner wall of the through hole in the first guide block 41. The protrusion of the first elastic member 412 is used to achieve radial compression and limiting of the headrest rod 20.

[0037] The first elastic element 412 provides elastic compensation for the headrest rod 20 to adapt to the locking strength between the headrest rod 20 and the first elastic element 412. Through the elastic radial compression of the first elastic element 412, the movement gap between the headrest rod 20 and the first guide block body 411 is dynamically and in real time eliminated, so that there is no shaking or abnormal noise during the movement. This overcomes the problem of gap recurrence caused by wear, tolerance and thermal deformation after long-term use of rigid contact structures.

[0038] Specifically, see Figure 8 The first elastic element 412 includes a bearing portion 413 and a plurality of spring pieces 414 fixedly connected to the bearing portion 413. The bearing portion 413 is used to connect with the inner wall of the first guide block body 411. The plurality of spring pieces 414 are arranged circumferentially around the bearing portion 413, and the spring pieces 414 protrude toward the center of the through hole opened in the first guide block body 411. When the headrest rod 20 passes through the through hole opened in the first guide block body 411 and connects with the mechanism frame 10, the plurality of spring pieces 414 radially elastically abut against the outer wall surface of the headrest rod 20.

[0039] The bearing part 413 is an I-shaped support structure. The bearing part 413 is embedded in the first guide block body 411 to complete the fixed assembly of the first elastic element 412 relative to the first guide block body 411. The spring piece 414 has a certain elastic deformation. When the headrest rod 20 is not sleeved in the first guide block 41, the elastic protrusion of the spring piece 414 faces the center of the through hole of the first guide block body 411. When the headrest rod 20 passes through the through hole of the first guide block body 411, the spring piece 414 elastically interferes with the headrest rod 20, dynamically adapting to the movement of the headrest rod 20 in real time, thereby effectively avoiding the generation of movement gap between the headrest rod 20 and the inner wall of the first guide block body 411.

[0040] Meanwhile, multiple spring pieces 414 are arranged circumferentially around the bearing part 413. Unlike the elastic elements arranged in a full circle, the spring pieces 414 arranged at intervals in this application essentially discretize the friction contact area, forming multiple discrete small-area contacts rather than continuous surface contacts. This can significantly reduce the effective friction area between the first elastic element 412 and the headrest rod 20, making the up-and-down adjustment of the mechanism frame 10 relative to the headrest rod 20 exceptionally easy and smooth, reducing the feeling of adjustment sticking, and effectively improving the comfort and experience of operation.

[0041] Further preferred, the support part 413 is an arc-shaped ring structure with an opening 11 on one side. The design of the opening 11 on one side allows the support part 413 to be inserted directly into the annular groove on the inner wall of the first guide block body 411 from the side, like a hairpin structure, so as to achieve more convenient assembly.

[0042] As another preferred option, multiple first guide blocks 41 are provided, and multiple first guide blocks 41 are all provided at the connection between the mechanism frame 10 and the headrest rod 20. The multiple first guide blocks 41 are arranged at intervals along the axial movement direction of the headrest rod 20. Preferably, the first guide blocks 41 are provided at the upper and lower ends of the mechanism frame 10, which facilitates the disassembly and replacement of the first guide blocks 41 while ensuring stable movement of the headrest rod 20.

[0043] In a further preferred embodiment, the outer wall of the first guide block 41 is provided with a first engaging member 415, and an opening 11 is provided on the corresponding mechanism frame 10, so that the first engaging member 415 can be fastened into the opening 11 to realize the connection between the first guide block 41 and the mechanism frame 10, and to provide a more convenient possibility for disassembly and replacement of the first guide block 41.

[0044] Among them, see Figure 4 and Figure 6The first guide block 41 can be inserted into the pre-reserved space groove of the mechanism frame 10 from top to bottom along the Z-axis. The specific operation process is to align the first guide block 41 with the top opening 11 of the space groove of the mechanism frame 10 and apply a downward force in the vertical direction of the Z-axis. The outer wall of the first guide block body 411 gradually contacts the inner wall of the space groove of the mechanism frame 10. At the same time, the grid structure of the first guide block body 411 provides a certain deformation capability for the first engaging member 415 so that when the first guide block 41 descends to the preset depth, the first engaging member 415 and the opening 11 on the mechanism frame 10 are just at the same level. At this time, the first engaging member 415 is no longer squeezed by the inner wall of the groove, and the protruding part of the buckle is embedded in the opening 11 and locked with the edge of the opening 11. The moment of engagement is accompanied by a click or a change in feel, indicating that the first guide block 41 and the mechanism frame 10 have been engaged.

[0045] Preferably, the outer wall of the first guide block 41 is further provided with a reinforcing rib 416, and a limiting protrusion 12 is provided on one side of the corresponding mechanism frame 10; wherein, when the first guide block 41 is engaged with the opening 11 by the first engaging member 415, the reinforcing rib 416 and the limiting protrusion 12 abut against each other to improve the connection strength between the first guide block 41 and the mechanism frame 10.

[0046] Preferably, when the first guide block 41 is fastened to the mechanism frame 10 along the axial direction of the headrest rod 20, the reinforcing rib 416 and the limiting protrusion 12 form a progressive abutment fit; wherein, the reinforcing rib 416 has a gradually changing protrusion height along the fastening direction, and the height of its starting end 417 is less than the height of its ending end 418, so that during the fastening process, the starting end 417 of the reinforcing rib 416 first contacts the limiting protrusion 12, and guides the limiting protrusion 12 to slide to the ending end 418 of the reinforcing rib 416 as the fastening process progresses, and finally forms a complete limit, so as to form a similar guiding and progressive structure.

[0047] In the initial stage of contact, the reinforcing rib 416 and the limiting protrusion 12 only make slight contact with each other through the low starting end 417. The initial resistance is small. As the contact process progresses, the contact height gradually increases and the resistance increases slowly. The gradual force avoids the problem of sudden jamming or instantaneous surge of resistance in traditional rigid contact, making the contact and fitting process between the first guide block 41 and the mechanism frame 10 smoother and reducing the difficulty of operation during assembly.

[0048] Preferably, the guide member 40 includes a second guide block 42, which is disposed at the connection between the mechanism frame 10 and the front and rear motion support assembly 30. The second guide block 42 includes a second guide block body 421 and a second elastic member 422. The second guide block body 421 is connected to the mechanism frame 10 and has a through hole for the front and rear motion support assembly 30 to pass through. The second elastic member 422 is connected to the second guide member 40 and is located on the inner wall of the through hole in the second guide block 42. The protrusion of the second elastic member 422 is used to achieve radial compression and limiting of the headrest rod 20.

[0049] In this embodiment, the first elastic element 412 and the second elastic element 422 have the same structure and function.

[0050] Preferably, the outer wall of the second guide block 42 is provided with a boss 423, and a second engaging member 13 is provided on the corresponding mechanism frame 10. When the second guide block 42 is assembled with the mechanism frame 10 along the moving direction of the front and rear moving bracket assembly 30, it is engaged into the boss 423 by the second engaging member 13 to realize the connection between the second guide block 42 and the mechanism frame 10.

[0051] Specifically, see Figure 5 and Figure 7 The structure of the second guide block body 421 is different from that of the first guide block body 411. Both the upper and lower ends of the second guide block body 421 are provided with protrusions 423. The mechanism frame 10 is provided with a hook-shaped second engaging member 13 at the position corresponding to the assembly of the second guide block 42. The second guide block 42 only needs to be pushed into the mechanism frame 10 along the axial direction of the front and rear moving bracket assembly 30. The second inclined surface 424 provided on the protrusion 423 will gradually abut against the first inclined surface 14 provided on the second engaging member 13. With the push force acting on the second guide block 42, the second engaging member 13 gradually gives way to the protrusion 423. When the protrusion 423 is engaged to the hook-shaped end of the second engaging member 13, the second inclined surface 424 disengages from the first inclined surface 14, and the second engaging member 13 elastically resets to achieve a limiting engagement of the protrusion 423. The first inclined surface 14 and the second inclined surface 424 provide a guiding engagement for the second guide block 42 and the mechanism frame 10.

[0052] In this embodiment, a boss 423 is provided on the second guide block body 421, and a second locking member 13 is provided on the mechanism frame 10. The second locking member 13 is an elastic buckle. When the second guide block body 421 is disengaged from the mechanism frame 10, the second locking member 13 needs to be pushed outward to unlock the second locking member 13 from the boss 423.

[0053] 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 four-way adjustable headrest movement mechanism, characterized in that, include: Structural framework; A headrest rod, wherein the mechanism frame is movably connected to the headrest rod to realize the vertical adjustment of the mechanism frame relative to the headrest rod; A front and rear motion support assembly is movably connected to the mechanism frame to realize the front and rear motion adjustment of the front and rear motion support assembly relative to the mechanism frame; A guide member is provided at the connection between the headrest rod and the mechanism frame, and / or at the connection between the front and rear motion support assembly and the mechanism frame; The guide member is used to reduce the movement gap between the headrest rod and the mechanism frame, and / or reduce the movement gap between the front and rear motion support assembly and the mechanism frame.

2. The four-way adjustable headrest movement mechanism as described in claim 1, characterized in that, The guide component includes a first guide block, which is disposed at the connection between the mechanism frame and the headrest rod; The first guide block includes a first guide block body and a first elastic element. The first guide block body is connected to the mechanism frame. The first guide block body has a through hole for the headrest rod to pass through. The first elastic element is connected to the first guide block, and the first elastic element is located on the inner wall of the through hole in the first guide block. The protrusion of the first elastic element is used to achieve radial compression and limiting of the headrest rod.

3. The four-way adjustable headrest movement mechanism as described in claim 2, characterized in that, Multiple first guide blocks are provided, and each first guide block is provided at the connection between the mechanism frame and the headrest rod, and the multiple first guide blocks are arranged at intervals along the axial movement direction of the headrest rod.

4. The four-way adjustable headrest movement mechanism as described in claim 2, characterized in that, The first elastic element includes a support portion and a plurality of spring pieces fixedly connected to the support portion. The support portion is used to connect with the inner wall of the first guide block body. The plurality of spring pieces are circumferentially spaced around the support portion, and the spring pieces protrude toward the center of the through hole in the first guide block body. When the headrest rod passes through the through hole in the first guide block body and connects to the mechanism frame, the multiple spring pieces radially and elastically abut against the outer wall surface of the headrest rod.

5. The four-way adjustable headrest movement mechanism as described in claim 4, characterized in that, The supporting part is an arc-shaped ring structure with an opening on one side.

6. The four-way adjustable headrest movement mechanism as described in claim 2, characterized in that, The outer wall of the first guide block is provided with a first engaging member, and an opening is provided on the corresponding mechanism frame, so that the first engaging member can be fastened into the opening to realize the connection between the first guide block and the mechanism frame.

7. The four-way adjustable headrest movement mechanism as described in claim 6, characterized in that, The outer wall of the first guide block is also provided with reinforcing ribs, and a limiting protrusion is provided on one side corresponding to the mechanism frame; When the first guide block engages with the opening via the first engaging member, the reinforcing rib and the limiting protrusion abut against each other.

8. The four-way adjustable headrest movement mechanism as described in claim 7, characterized in that, When the first guide block is fastened to the mechanism frame along the axial direction of the headrest rod, the reinforcing rib and the limiting protrusion form a progressive abutment fit; The reinforcing rib has a gradually varying height along the fastening direction, with the height at the beginning being less than the height at the end. This ensures that during the fastening process, the beginning of the reinforcing rib preferentially contacts the limiting protrusion and guides the limiting protrusion to slide to the end of the reinforcing rib as the fastening process progresses, ultimately forming a complete limit.

9. The four-way adjustable headrest movement mechanism as described in claim 1, characterized in that, The guide component includes a second guide block, which is disposed at the connection between the mechanism frame and the front and rear motion support assembly. The second guide block includes a second guide block body and a second elastic element. The second guide block body is connected to the mechanism frame. The second guide block body has a through hole for the front and rear motion support assembly to pass through. The second elastic element is connected to the second guide block, and the second elastic element is positioned on the inner wall of the through hole in the second guide block. The protrusion of the second elastic element is used to achieve radial compression and limiting of the headrest rod.

10. The four-way adjustable headrest movement mechanism as described in claim 9, characterized in that, The outer wall of the second guide block is provided with a boss, and a second engaging member is provided on the corresponding mechanism frame. When the second guide block is assembled with the mechanism frame along the moving direction of the front and rear moving bracket assembly, the second engaging member is engaged into the boss to realize the connection between the second guide block and the mechanism frame.

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