Up-down adjusting mechanism of seat headrest and seat
Through the matching structure of the ball head and the spherical groove, the complex and inconvenient adjustment mechanism of the existing seat headrest is solved, and one-handed operation and convenient adjustment are achieved.
Patent Information
- Application Number
- CN202421804548.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The upper and lower adjustment mechanism of the existing seat headrests has a complex structure and poor stability, which cannot achieve one-handed operation, and is not very convenient to use.
The matching structure between the ball head and the spherical groove is adopted. Through the embedding and disengagement of the ball head and the spherical groove, the freedom of up and down movement of the movable seat is locked, simplified the structure and achieved one-hand adjustment.
The seat structure is simplified, and the convenience of up and down adjustment of the headrest is improved, allowing users to operate the upper and lower position adjustment of the headrest with one hand.
Smart Images
Figure CN222840716U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of seats, in particular to an up-and-down adjustment mechanism for a seat headrest and a seat. Background Art
[0002] In some existing gaming chairs and study chairs, a headrest is usually installed on the backrest to support the user's head and neck to relieve the user's neck fatigue. A general seat headrest is fixed to the top of the seat backrest. A headrest with a fixed position can hardly meet the different body shapes and different sitting posture requirements of users. In order to overcome this defect, some existing seat headrests are installed on the seat backrest in an adjustable manner. The up and down adjustment mechanism of the headrest usually adopts a sliding locking member structure. The locking member itself has a relatively complex structure, and it is necessary to configure complex card slots and slide grooves on the headrest mounting seat and the backrest, resulting in a complex overall structure and poor stability. When adjusting the up and down position of the headrest, the user needs to operate the locking member with one hand and move the headrest up and down with the other hand. One-handed operation cannot be achieved, and the convenience of use is poor. Utility Model Content
[0003] The utility model aims to provide a seat headrest up and down adjustment mechanism and a seat, which can simplify the structure of the seat and improve the convenience of up and down adjustment of the headrest.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] The up and down adjustment mechanism of the seat headrest includes a connecting seat connected to the seat, a movable seat connected to the headrest, and a locking member;
[0006] The movable seat is slidably matched with the connecting seat so that the movable seat can move up and down relative to the connecting seat. The movable seat is provided with a matching surface facing the connecting seat, and a plurality of spherical grooves arranged in the up-down direction are formed on the matching surface;
[0007] The locking member includes a columnar connecting portion fixedly matched with the connecting seat, a ball head matched with the spherical groove, and an elastic member, wherein the elastic member is used to apply an elastic stress to the ball head, and the elastic stress is used to push the ball head toward the matching surface so that the ball head can be embedded in the spherical groove.
[0008] Preferably, the columnar connecting part is hollow and has an opening formed at its inner end, the ball head is placed in the inner cavity of the columnar connecting part and a part of it extends from the opening to the outside of the columnar connecting part, and the elastic member is a spring placed in the inner cavity of the columnar connecting part.
[0009] Preferably, a threaded hole is provided on the connecting seat, and an external thread matching the internal thread of the threaded hole is provided on the outer peripheral surface of the columnar connecting part. The outer end of the columnar connecting part forms an adjustment end, which is used to drive the columnar connecting part to rotate in the threaded hole to change the distance between the columnar connecting part and the mating surface.
[0010] Preferably, the connecting seat includes a guide seat and a cover plate, the threaded hole extends from the outer side surface of the guide seat to the inner side surface of the guide seat, and the cover plate is fixedly connected to the guide seat in a detachable manner and seals the outer end of the threaded hole.
[0011] Preferably, a slide groove is provided on the inner side surface of the guide seat, which is recessed toward the outer side surface of the guide seat and extends in the up and down directions. The slide groove includes a bottom surface and two side surfaces respectively located on both sides of the bottom surface, and the two side surfaces are gradually inclined toward the middle of the slide groove from the side connected with the bottom surface to the side away from the bottom surface; a slider slidably embedded in the slide groove is provided on the movable seat, and the surface of the slider facing the bottom surface of the slide groove forms a mating surface, and an inclined surface is formed on both sides of the slider, and the inclined surfaces are gradually inclined toward the middle of the slider from the side connected with the mating surface to the side away from the mating surface, and the two inclined surfaces are respectively slidably attached to the two side surfaces of the slide groove.
[0012] Preferably, the movable seat includes a mounting seat, the slider is detachably fixed to the outer side surface of the mounting seat, two baffles extending in the up-down direction are arranged on the outer side surface of the mounting seat, and the guide seat is defined between the two baffles.
[0013] Preferably, the tops of the two baffles are provided with upper limit walls extending toward each other, the bottoms of the two baffles are provided with lower limit walls extending toward each other, and the guide seat slides relative to the slider between the upper limit wall and the lower limit wall.
[0014] Preferably, a gap is formed between the mating surface and the bottom surface of the slide groove, and a support bar extending in the up and down directions is embedded in the gap. The support bar is fixedly matched with the guide seat or the slider, and the support bar is wavy and its two sides respectively abut against the mating surface and the bottom surface of the slide groove; a boss is provided on the bottom surface of the slide groove, and the inner end of the threaded hole extends to the end surface of the boss.
[0015] Preferably, a mounting groove is provided on the bottom surface of the slide groove, and the mounting groove extends from one end of the slide groove to the other end. A clamping groove connected to the mounting groove is respectively provided on the upper end surface and the lower end surface of the guide seat. A clamping hook is formed at each end of the support bar, and the support bar is embedded in the mounting groove. The hooks at both ends of the support bar are respectively clamped in the two clamping grooves to fix the support bar and the guide seat together.
[0016] The seat comprises the above-mentioned up and down adjustment mechanism of the seat headrest.
[0017] Compared with the prior art, the beneficial effects of the present invention are:
[0018] In the utility model, the freedom of the movable seat to move in the up and down directions relative to the connecting seat is locked through the cooperation between the ball head and the spherical groove, so that the headrest on the movable seat can support the user's head and neck when the seat is in use, and there is no need to set a complicated structure between the movable seat and the connecting seat. When adjusting, the movable seat is moved up and down, and the side of the spherical groove pushes the ball head so that the ball head can be disengaged from the spherical groove. When the movable seat is adjusted into place, the ball head is stuck in the spherical groove at the corresponding position. The user only needs to move the movable seat with one hand to complete the up and down position adjustment of the headrest, which makes the up and down position adjustment of the headrest easy to operate and improves the convenience of headrest adjustment. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the utility model;
[0020] Figure 2 A cross-sectional view of the utility model;
[0021] Figure 3 for Figure 2 AA section view;
[0022] Figure 4 for Figure 1 Schematic diagram of the coordination between the middle guide seat and the support bar.
[0023] Among them: 100, movable seat; 10, mounting seat; 11, baffle; 111, upper limit wall; 112, lower limit wall; 20, slider; 201, mating surface; 202, inclined surface; 21, spherical groove; 300, connecting seat; 30, guide seat; 301, outer side surface; 302, inner side surface; 303, upper end surface; 304, lower end surface; 31, threaded hole; 32, slide groove; 321, bottom surface; 322, side surface; 33, mounting groove; 34, boss; 35, snap-in groove; 40, cover plate; 50, columnar connecting part; 51, spring; 60, ball head; 70, support bar; 71, hook. DETAILED DESCRIPTION
[0024] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0025] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.
[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0027] like Figure 1 , 2 , 3, and 4 show an up-and-down adjustment mechanism for a seat headrest of the utility model, which includes a connecting seat 300, a movable seat 100, and a locking member, wherein the connecting seat 300 is connected to the seat, and specifically the connecting seat 300 may be fixed to the top of the seat back, and the movable seat 100 is connected to the headrest of the seat, and the movable seat 100 and the connecting seat 300 are slidably matched, so that the movable seat 100 has the freedom to move relative to the connecting seat 300 in the up-and-down direction, thereby enabling the headrest to move up-and-down relative to the seat back; a mating surface 201 facing the connecting seat 300 is provided on the movable seat 100, and a plurality of spherical surfaces arranged in the up-and-down direction are provided on the mating surface 201. Groove 21; the locking member includes a columnar connecting portion 50, a spring 51, and a ball head 60, wherein the columnar connecting portion 50 is fixedly matched with the connecting seat 300, the ball head 60 is installed on the columnar connecting portion 50 and its shape matches the shape of the spherical groove 21, and the two ends of the spring 51 respectively abut against the columnar connecting portion 50 and the ball head 60, which is used to apply an elastic stress to the ball head 60 to always push the ball head 60 toward the matching surface 201, and then when the ball head 60 is aligned with the spherical groove 21 in the up and down direction, a part of the ball head 60 can be embedded in the spherical groove 21, so that the ball head 60 is used to limit the freedom of relative movement between the columnar connecting portion 50 and the movable seat 100 in the up and down direction.
[0028] In the utility model, the freedom of the movable seat 100 to move in the up and down directions relative to the connecting seat 300 is locked through the cooperation between the ball head 60 and the spherical groove 21, so that when the seat is in use, the headrest on the movable seat 100 can support the user's head and neck, and there is no need to set a complex structure between the movable seat 100 and the connecting seat 300. When adjusting, the movable seat 100 is moved up and down, and the side of the spherical groove 21 pushes the ball head 60 so that the ball head 60 can be disengaged from the spherical groove 21. When the movable seat 100 is adjusted into place, the ball head 60 is snapped into the spherical groove 21 at the corresponding position. The user only needs to move the movable seat 100 with one hand to complete the up and down position adjustment of the headrest, making the up and down position adjustment of the headrest easy to operate, thereby improving the convenience of headrest adjustment.
[0029] In a preferred embodiment, the columnar connecting part 50 is a hollow structure, and an opening is formed at its inner end. The ball head 60 is placed in the inner cavity of the columnar connecting part 50. The outer diameter of the ball head 60 is larger than the diameter of the opening, so that when the ball head 60 is placed at the opening, a part of it can extend from the opening to the outside of the columnar connecting part 50, and the ball head 60 is prevented from being separated from the columnar connecting part 50 from the opening. The spring 51 is located in the inner cavity of the columnar connecting part 50, one end of which abuts against the ball head 60 and the other end abuts against the end of the columnar connecting part 50 opposite to the opening. The spring 51 is in a compressed state so that it can always apply elastic stress to the ball head 60. In other embodiments, the spring 51 can also be an elastic member such as an elastic rubber block. A threaded hole 31 is provided on the connecting seat 300, and an external thread is opened on the outer peripheral surface of the columnar connecting part 50, which is inserted into the threaded hole 31 and screwed together with the internal thread inside the threaded hole 31. The outer end of the columnar connecting part 50 forms an adjustment end, and the columnar connecting part 50 is rotated inside the threaded hole 31 by operating the adjustment end. According to the screw thread engagement structure between the columnar connecting part 50 and the threaded hole 31, the columnar connecting part 50 can move in the inner and outer directions, thereby changing the distance between the columnar connecting part 50 and the mating surface 201. The columnar connecting part 50 can be moved closer to the mating surface 201 or farther away from the mating surface 201 in the inner and outer directions by rotating the adjusting end of the columnar connecting part 50. When the columnar connecting part 50 is closer to the mating surface 201, the fitting clearance between the ball head 60 and the spherical groove 21 is smaller, and the deformation amount of the spring 51 due to the extrusion is larger, and the elastic stress applied by the spring 51 to the ball head 60 is larger. On the contrary, when the columnar connecting part 50 is away from the mating surface 201, the fitting clearance between the ball head 60 and the spherical groove 21 is larger, and the deformation amount of the spring 51 due to the extrusion is smaller, and the elastic stress applied by the spring 51 to the ball head 60 is smaller. During the use of the seat, when the fitting clearance between the ball head 60 and the spherical groove 21 is too small, the adjustment required for adjusting the headrest in the up and down directions is not required. The external force will be relatively large. At this time, the cylindrical connecting part 50 can be rotated to increase the fitting clearance between the ball head 60 and the spherical groove 21, and at the same time reduce the deformation of the spring 51. When the above-mentioned fitting clearance is too large, the headrest will have abnormal up and down movement, which will result in failure to provide stable support for the user's head and neck. At this time, the cylindrical connecting part 50 can be rotated to reduce the fitting clearance between the ball head 60 and the spherical groove 21, and at the same time increase the deformation of the spring 51. Therefore, by adjusting the cylindrical connecting part 50, the fitting clearance between the ball head 60 and the spherical groove 21 and the deformation of the spring 51 can be adjusted to more appropriate values, thereby ensuring that the headrest can provide stable support for the user's head and neck, making the adjustment of the headrest labor-saving and convenient.
[0030] In a preferred embodiment, the connecting seat 300 includes a guide seat 30 and a cover plate 40, and a threaded hole 31 is opened on the guide seat 30, which extends from the outer side surface 301 of the guide seat 30 to the inner side surface 302 of the guide seat 30, and the cover plate 40 is fixedly connected to the guide seat 30 in a detachable manner, and the cover plate 40 covers the outer end of the threaded hole 31; for example, the cover plate 40 can be connected to the guide seat 30 by screws. When the columnar connecting part 50 needs to be adjusted, the cover plate 40 can be removed from the guide seat 30. After the adjustment of the columnar connecting part 50 is completed, the cover plate 40 is fixed to the guide seat 30, and the outer end of the threaded hole 31 is covered by the cover plate 40 to prevent dust, water and other impurities from entering the threaded hole 31, thereby protecting the columnar connecting part 50. The inner side surface 302 of the guide seat 30 is provided with a slide groove 32 which is recessed toward the outer side surface 301. The slide groove 32 extends in the up-down direction. The slide groove 32 includes a bottom surface 321 and two side surfaces 322 respectively located on both sides of the bottom surface 321. The two side surfaces 322 are gradually inclined toward the middle of the slide groove 32 from the side connected with the bottom surface 321 to the side away from the bottom surface 321. The slide groove 32 forms a dovetail groove through the two inclined side surfaces 322. The movable seat 100 includes a slider 20 and a mounting seat 10. The slider 20 is fixedly matched with the mounting seat 10. The slider 20 is slidably embedded in the slide groove 32. It can slide relative to the guide seat 30 in the extending direction of the slide groove 32. The surface of the slider 20 facing the bottom surface 321 of the slide groove 32 forms a mating surface 201. The two sides of the slider 20 are divided into A slope 202 is formed separately, and the slope 202 gradually tilts from the side connected with the matching surface 201 to the side away from the matching surface 201 toward the middle of the slider 20. The slider 20 is constructed into a dovetail shape through the two slopes 202 and the matching surface 201, so that the slider 20 matches the shape of the slide groove 32. The two slopes 202 slide against the two side surfaces 322 of the slide groove 32 respectively. In this way, while ensuring that the slider 20 can slide up and down along the extension direction of the slide groove 32, the slider 20 is stably matched with the guide seat 30 in the inner and outer directions, ensuring that there is a relatively stable matching gap between the matching surface 201 and the bottom surface 321 of the slide groove 32, and then a relatively stable matching gap is formed between the ball head 60 installed on the guide seat 30 and the spherical groove 21 located on the matching surface 201.The slider 20 is fixed to the outer side of the mounting seat 10 by screws or other detachable connection methods. Two baffles 11 extending in the up and down directions are also provided on the outer side of the mounting seat 10. The guide seat 30 is limited between the two baffles 11. The guide seat 30 is limited by the two baffles 11 to prevent the slider 20 from swinging when sliding in the up and down directions. During assembly, the bottom of the slider 20 is inserted into the slide groove 32 from the top of the slide groove 32, and then the mounting seat 10 is placed on the inner side of the slider 20, so that the two baffles 11 are respectively placed on both sides of the guide seat 30, and the mounting seat 10 and the slider 20 are fixed by screws. The screws are tightened so that the inclined surfaces 202 on both sides of the slider 20 are respectively abutted against the two side surfaces 322 of the slide groove 32. At this time, in the inner and outer directions, the two inclined surfaces 202 respectively press the two side surfaces 322 of the slide groove 32 inwardly to prevent the guide seat 30 from loosening relative to the slider 20 in the inner and outer directions, thereby ensuring that there is a constant matching gap between the matching surface 201 and the bottom surface 321 of the slide groove 32. An upper limit wall 111 extending toward each other is arranged at the top of the two baffles 11, and a lower limit wall 112 extending toward each other is arranged at the bottom of the two baffles 11. The guide seat 30 is limited to slide relative to the slider 20 between the upper limit wall 111 and the lower limit wall 112, thereby limiting the maximum stroke of the movable seat 100 moving up and down relative to the connecting seat 300.
[0031] In the utility model, by setting the slide groove 32 and the slider 20 as a dovetail structure, the mating surface 201 can be abutted against the bottom surface 321 of the slide groove 32, so that the mating surface 201 and the bottom surface 321 form a smaller and more stable mating gap by being closely attached to each other, thereby ensuring that the mating gap between the ball head 60 and the spherical groove 21 is more stable. In a preferred embodiment, a relatively large gap may be formed between the mating surface 201 and the bottom surface 321 of the slide groove 32, and a support bar 70 extending in the up-down direction is embedded in the gap. The support bar 70 is fixed on the guide seat 30, and the two sides of the support bar 70 are respectively pressed against the mating surface 201 and the bottom surface 321 of the slide groove 32. The support bar 70 is set to a wave shape, so that the support bar 70 generates a slight deformation when it is pressed by the mating surface 201 and the slide groove 32. The elastic stress generated by the deformed support bar 70 is applied to the mating surface 201 and the slide groove 32. The elastic stress of the support bar 70 generates an interactive pre-tightening force between the guide seat 30 and the slider 20, thereby preventing the guide seat 30 and the slider 20 from loosening in the inward and outward directions, further making the mating surface A stable fitting gap is formed between 201 and the bottom surface 321 of the slide groove 32; a boss 34 is provided in the middle of the bottom surface 321 of the slide groove 32, and the inner end of the threaded hole 31 extends to the end surface of the boss 34. By extending the inner end of the threaded hole 31 to the boss 34, when there is a relatively large gap between the matching surface 201 and the bottom surface 321 of the slide groove 32, the boss 34 is used to reduce the distance between the inner end of the threaded hole 31 and the matching surface 201, which is conducive to the ball head 60 passing through the inner end of the threaded hole 31 and then being stuck in the spherical groove 21 on the matching surface 201, especially when the ball head 60 and the columnar connecting part 50 are of a split structure, the inner end of the threaded hole 31 is closer to the matching surface 201, which can prevent the ball head 60 from falling between the matching surface 201 and the boss 34. The bottom surface 321 of the slide groove 32 is provided with a mounting groove 33, which extends from one end of the slide groove 32 to the other end. The upper end surface 303 and the lower end surface 304 of the guide seat 30 are respectively provided with a clamping groove 35 connected with both ends of the mounting groove 33. The two ends of the support bar 70 respectively form a hook 71. The support bar 70 is embedded in the mounting groove 33. The mounting groove 33 is used to limit the lateral position of the support bar 70. The two hooks 71 of the support bar 70 are respectively clamped in the two clamping grooves 35, so that the support bar 70 is fixedly connected to the guide seat 30. In other embodiments, the support bar 70 can also be fixed on the slider 20, and the support bar 70 can be connected to the slider 20 using the same structure as described above.By setting a support bar 70 between the mating surface 201 and the bottom surface 321 of the slide groove 32, not only can the slider 20 and the guide seat 30 be pre-tightened, but also the contact area between the mating surface 201 and the bottom surface 321 of the slide groove 32 is reduced, so that there is a relatively small friction between the slider 20 and the guide seat 30. In addition, the support bar 70 is fixed to the guide seat 30 or the slider 20 in a detachable manner. When the support bar 70 is severely worn, resulting in looseness between the slider 20 and the guide seat 30 in the inward and outward directions, a new support bar 70 can be replaced.
[0032] The seat of the utility model includes the above-mentioned up-and-down adjustment mechanism of the seat headrest, and other structures of the seat are the same as those in the prior art, which will not be described in detail here.
[0033] Finally, it should be noted that the above-mentioned implementation modes are only optional embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.
Claims
1. The up and down adjustment mechanism of the seat headrest is characterized by: It includes a connecting seat connected to the seat, a movable seat connected to the headrest, and a locking member; The movable seat is slidably matched with the connecting seat so that the movable seat can move up and down relative to the connecting seat. The movable seat is provided with a matching surface facing the connecting seat, and a plurality of spherical grooves arranged in the up-down direction are formed on the matching surface; The locking member includes a columnar connecting portion fixedly matched with the connecting seat, a ball head matched with the spherical groove, and an elastic member, wherein the elastic member is used to apply an elastic stress to the ball head, and the elastic stress is used to push the ball head toward the matching surface so that the ball head can be embedded in the spherical groove.
2. The seat headrest up and down adjustment mechanism according to claim 1, characterized in that: The columnar connecting part is hollow and has an opening formed at its inner end. The ball head is placed in the inner cavity of the columnar connecting part and a part of it extends out of the columnar connecting part from the opening. The elastic member is a spring placed in the inner cavity of the columnar connecting part.
3. The up and down adjustment mechanism of the seat headrest according to claim 1 or 2, characterized in that: A threaded hole is provided on the connecting seat, and an external thread matching the internal thread of the threaded hole is provided on the outer peripheral surface of the columnar connecting part. The outer end of the columnar connecting part forms an adjustment end, which is used to drive the columnar connecting part to rotate in the threaded hole to change the distance between the columnar connecting part and the mating surface.
4. The seat headrest up and down adjustment mechanism according to claim 3, characterized in that: The connecting seat comprises a guide seat and a cover plate, the threaded hole extends from the outer side surface of the guide seat to the inner side surface of the guide seat, and the cover plate is fixedly connected to the guide seat in a detachable manner and covers the outer end of the threaded hole.
5. The seat headrest up and down adjustment mechanism according to claim 4, characterized in that: The inner side surface of the guide seat is provided with a slide groove which is recessed toward the outer side surface of the guide seat and extends in the up and down directions. The slide groove includes a bottom surface and two side surfaces respectively located on both sides of the bottom surface. The two side surfaces are gradually inclined toward the middle of the slide groove from the side connected with the bottom surface to the side away from the bottom surface; the movable seat is provided with a slider which is slidably embedded in the slide groove, and the surface of the slider facing the bottom surface of the slide groove forms a mating surface. An inclined surface is formed on both sides of the slider, and the inclined surfaces are gradually inclined toward the middle of the slider from the side connected with the mating surface to the side away from the mating surface. The two inclined surfaces slide respectively against the two side surfaces of the slide groove.
6. The seat headrest up and down adjustment mechanism according to claim 5, characterized in that: The movable seat comprises a mounting seat, a sliding block is detachably fixed on the outer side of the mounting seat, two baffles extending in the up-down direction are arranged on the outer side of the mounting seat, and the guide seat is limited between the two baffles.
7. The seat headrest up and down adjustment mechanism according to claim 5, characterized in that: The tops of the two baffles are provided with upper limit walls extending toward each other, the bottoms of the two baffles are provided with lower limit walls extending toward each other, and the guide seat slides relative to the slider between the upper limit wall and the lower limit wall.
8. The seat headrest up and down adjustment mechanism according to claim 5, characterized in that: A gap is formed between the mating surface and the bottom surface of the slide groove, and a support bar extending in the up and down directions is embedded in the gap. The support bar is fixedly matched with the guide seat or the slider. The support bar is wavy and its two sides respectively abut against the mating surface and the bottom surface of the slide groove; a boss is arranged on the bottom surface of the slide groove, and the inner end of the threaded hole extends to the end surface of the boss.
9. The seat headrest up and down adjustment mechanism according to claim 8, characterized in that: A mounting groove is arranged on the bottom surface of the slide groove, and the mounting groove extends from one end of the slide groove to the other end. A clamping groove connected to the mounting groove is respectively arranged on the upper end surface and the lower end surface of the guide seat. A clamping hook is formed at each end of the support bar, and the support bar is embedded in the mounting groove. The clamping hooks at both ends of the support bar are respectively clamped in the two clamping grooves to fix the support bar and the guide seat together.
10. A seat, characterized in that: A seat headrest up and down adjustment mechanism comprising the seat headrest described in any one of claims 1-9.