Seat headrest capable of being lifted and adjusted in two-section rotating mode
By designing seat headrests that can be lifted and two-stage rotation adjustment, the problems of limited adjustment range and troublesome operation in the prior art are solved, and a larger range of headrest adjustment and convenience of use are achieved.
Patent Information
- Application Number
- CN202421710881.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-18
AI Technical Summary
The adjustment range of existing office seat headrests is limited, and it is troublesome to operate, making it difficult to be suitable for people with heights below 1.5m, and it is inconvenient to use.
A seat headrest that can be lifted and two-stage rotation adjustment is designed. By setting up a two-stage deflection adjustment structure and a locked lifting adjustment structure, a larger range of headrest adjustment is achieved, with a stable and reliable structure and simple and convenient operation.
A larger range of headrest adjustment is achieved, suitable for more people, with stable and reliable structure and convenient use, solving the problems of limited adjustment range and troublesome operation in the prior art.
Smart Images
Figure CN222898654U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of seat structures, and relates to a seat headrest capable of lifting and two-stage rotation adjustment. Background Art
[0002] Seats are essential office furniture for office workers. In order to provide more comfortable support for the headrests of office chairs, the headrests of general office seats are usually equipped with lifting structures. However, there are certain deficiencies in the current lifting headrests on the market:
[0003] First, the adjustment range is limited and the applicable population is small. The headrests of general office seats usually only have a small range of lifting adjustment functions, and the adjustment range is very limited. Usually, they are only suitable for tall people. When people with a height below 1.5m use them, they cannot provide comfortable support.
[0004] Second, the operation is troublesome and time-consuming. The existing headrests of office seats need to be pulled forcefully behind the chair to achieve elevation or lowering, which is not convenient to use. There are problems such as being difficult to pull with effort or being too loose and easy to fall off. And generally, the headrests slide through the sliding rod in cooperation with the headrest base, and the appearance looks rather rigid.
[0005] It can be seen that there is still room for urgent improvement in the current seat headrests. It should be adjusted to meet the usage needs of more people, and at the same time improve the convenience of its use, be more convenient and fast during the adjustment process, and be able to maintain the structural stability and reliability. Therefore, a more reasonable technical solution needs to be proposed to solve the technical problems existing in the prior art. Summary of the Utility Model
[0006] To at least overcome one of the above-mentioned defects, the utility model proposes a seat headrest capable of lifting and two-stage rotation adjustment. By setting a two-stage deflection adjustment structure, the deflection adjustment range is increased. At the same time, a lockable lifting adjustment structure is set, which can cooperate with the deflection adjustment to achieve a larger range of headrest adjustment. The structure is stable and reliable enough, and the adjustment process is also simpler and more convenient, and it can be applicable to more people.
[0007] To achieve the above object, the seat headrest disclosed by the utility model can adopt the following technical solutions:
[0008] A seat headrest capable of lifting and two-stage rotation adjustment includes a base for cooperating with the seat. A connecting member is provided on the base. The tail of the connecting member is in deflection cooperation with the base, and the head of the rod connecting member is in rotational cooperation with the headrest frame. An elevating positioning structure is provided on the headrest frame, and the headrest frame is adjusted for elevation relative to the head of the connecting member through the elevating positioning structure.
[0009] The above-disclosed seat headrest can achieve two-stage rotation adjustment by deflecting and adjusting between the base and the connecting member, and between the connecting member and the headrest frame. The lifting and positioning structure can achieve the lifting adjustment of the headrest frame. The combined adjustment can achieve a larger range of angle adjustment, so it can be suitable for more people. At the same time, the structure of the present utility model is stable and reliable, and can maintain stable use.
[0010] Further, during deflection, the connecting member can stop at a certain angle relative to the base or the headrest frame, which can be achieved by various structures, but the specific structure is not uniquely limited. Here, one feasible option is optimized and proposed: a deflection positioning structure is formed between the base and the connecting member, and / or between the connecting member and the headrest frame. The deflection positioning structure includes a deflection shaft forming meshing teeth, and also includes a positioning block that forms meshing teeth and elastically abuts against the deflection shaft. When adopting such a scheme, through the meshing and abutting of the deflection shaft and the positioning block, the connecting member can be fixed at a certain angle with the base and the headrest frame, which is convenient for stable support after adjustment.
[0011] Furthermore, a specific description of the deflection positioning structure is given. Here, a deflection positioning structure scheme between the base and the connecting member is proposed: a base positioning hole is provided on the base, the positioning block is fitted into the base positioning hole, and an elastic force is provided by a base spring to abut against the tail of the connecting member. The tail of the connecting member forms a deflection shaft and cooperates with the positioning block to achieve deflection positioning. When adopting such a scheme, a positioning shaft extending into the base positioning hole is provided on the positioning block, the base spring is sleeved on the positioning shaft, and the base spring is kept in a compressed state to always provide an abutting force to push the positioning block towards the deflection shaft.
[0012] Furthermore, a specific description of the deflection positioning structure is given. Here, a deflection positioning structure scheme between the headrest frame and the connecting member is proposed: a connection positioning hole is provided at the head of the connecting member, the positioning block is fitted into the connection positioning hole, and an elastic force is provided by a connection spring to abut against the headrest frame. The headrest frame forms a deflection shaft and cooperates with the positioning block to achieve deflection positioning. When adopting such a scheme, a positioning shaft extending into the connection positioning hole is also provided on the positioning block, the connection spring is sleeved on the positioning shaft, and the base spring is kept in a compressed state to always provide an abutting force to push the positioning block towards the deflection shaft.
[0013] Further, during the deflection process, the deflection angles of the base, the connecting member, and the headrest frame should be limited to enable deflection adjustment within a reasonable range, so as to maintain effective support and the stability and reliability of the structure. The limitation of the deflection angle can be achieved through various solutions. Here, one feasible option is presented: Deflection limiting structures are formed at the tail of the base and the connecting member, and / or at the head of the headrest frame and the connecting member. The deflection limiting structure includes correspondingly arranged limit pins and limit grooves. A blocking protrusion corresponding to the limit groove is formed on the limit pin. When the base deflects relative to the tail of the connecting member, and / or the headrest frame deflects relative to the head of the connecting member, the blocking protrusion fits against the end face of the limit groove to prevent further deflection. When such a solution is adopted, the headrest frame can maintain a pitching adjustment range of 75° longitudinally relative to the connecting member, and the connecting member can maintain a pitching adjustment range of 75° longitudinally relative to the base. In cooperation with the deflection positioning structure, positioning and hovering can be maintained every time a fixed angle value is turned.
[0014] Furthermore, there are various solutions for the deflection limiting structure of the base and the connecting member, and it is not uniquely defined. Here, one feasible option is optimized and presented: Deflection connection holes are correspondingly arranged at the tail of the base and the connecting member, and the limit groove extends along the circumference of the deflection connection hole. The limit pin is inserted into the deflection connection hole, and the blocking protrusion extends into the limit groove. When such a solution is adopted, the limit groove can be arranged on the inner wall surface of the deflection connection hole or on the outer circumference of the deflection connection hole, and the structure of the blocking protrusion is adjusted accordingly.
[0015] Furthermore, there are various solutions for the deflection limiting structure of the headrest frame and the connecting member, and it is not uniquely defined. Here, one feasible option is optimized and presented: Deflection connection holes are correspondingly arranged at the head of the headrest frame and the connecting member, and the limit groove extends along the circumference of the deflection connection hole. The limit pin is inserted into the deflection connection hole, and the blocking protrusion extends into the limit groove. Similarly, when such a solution is adopted, the limit groove can be arranged on the inner wall surface of the deflection connection hole or on the outer circumference of the deflection connection hole, and the structure of the blocking protrusion is adjusted accordingly.
[0016] Further, when performing lifting adjustment, the lifting adjustment of the headrest frame can be achieved through various solutions, and the specific solutions are not uniquely limited. Here, an optimization is carried out and one more feasible option is proposed: The lifting and positioning structure includes a positioning plate and a lifting shaft that are slidably fitted correspondingly. An elastic positioning member and a number of positioning holes are formed between the positioning plate and the lifting shaft. When the positioning plate and the lifting shaft slide relatively up and down, the elastic positioning member is fitted and snapped into the corresponding positioning holes; A direction-keeping structure is also formed between the positioning plate and the lifting shaft. The direction-keeping structure includes a direction groove and a guiding strip. The guiding strip is snapped into the direction groove to guide the relative directional sliding of the positioning plate and the lifting shaft. When adopting such a solution, the elastic positioning member and the positioning holes form several matching gears, realizing multi-gear adjustment during the lifting adjustment process; Both the direction groove and the guiding strip are linear structures, and the number is greater than or equal to one, so as to keep the positioning plate and the lifting shaft sliding up and down along a straight line and avoid swinging.
[0017] Further, the setting method of the positioning holes and the elastic positioning member is not uniquely limited. Here, an optimization is carried out and one feasible option is proposed: The positioning holes are distributed at intervals along a straight line on the positioning plate, and mounting holes are provided on the lifting shaft for mounting the elastic positioning member. When adopting such a solution, the elastic positioning member includes a positioning ball. The ball is connected to a positioning shaft and cooperates with a positioning spring. The positioning spring is always elastically deformed and pushes the ball towards the positioning hole.
[0018] Furthermore, the structure of the positioning plate is not uniquely limited. Here, an optimization is carried out and one feasible option is proposed: The positioning plate includes a front plate and a rear plate. The front plate and the rear plate are arranged oppositely and form a gap. The lifting shaft is clamped in the gap and slides relative to the gap. When adopting such a solution, the lifting shaft slides more stably and reliably in the gap.
[0019] Compared with the prior art, some beneficial effects of the disclosed technical solution of the present utility model include:
[0020] The present utility model realizes two-stage pitching deflection adjustment and lifting adjustment by setting a connecting member to cooperate with the headrest frame and the base, can provide a larger range of adjustment, thus expanding the applicable population, and can also maintain the stability and reliability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.
[0022] Figure 1 It is an overall schematic diagram of the seat headrest.
[0023] Figure 2 It is an overall schematic diagram of the seat headrest from another perspective.
[0024] Figure 3 It is an exploded schematic diagram of the headrest frame, showing the components of the lifting and positioning structure in the figure.
[0025] Figure 4 It is an exploded schematic diagram of the cooperation between the headrest frame and the connecting piece, showing the components of the connecting piece in the figure.
[0026] Figure 5 It is an exploded schematic diagram of the seat headrest, showing the components of the base in the figure.
[0027] Figure 6 It is a schematic diagram of the structure of the headrest frame.
[0028] Figure 7 It is a schematic diagram of the front plate in the lifting and positioning structure.
[0029] Figure 8 It is a schematic diagram of the structure of the lifting shaft in the lifting and positioning structure.
[0030] Figure 9 It is a schematic diagram of the structure of the connecting piece.
[0031] Figure 10 It is a schematic diagram of the limit pin provided at the head of the connecting piece.
[0032] Figure 11 It is a schematic diagram of the limit pin provided at the tail of the connecting piece.
[0033] Figure 12 It is a schematic diagram of the structure of the base.
[0034] In the above-mentioned drawings, the meanings of each label are as follows:
[0035] 1. Base; 2. Connecting piece; 3. Headrest frame; 4. Front plate; 401. Positioning hole; 402. Direction groove; 5. Rear plate; 6. Lifting shaft; 601. Orientation strip; 7. Limit pin; 701. Blocking protrusion; 8. Deflection connection hole; 9. Limit groove; 10. Positioning block; 11. Connection spring; 12. Connection positioning hole; 13. Base spring. Detailed implementation manners
[0036] The following further explains the present utility model in conjunction with the drawings and specific embodiments.
[0037] In view of the situation that the existing adjustable headrest structure has a limited adjustment range, the adjustment is not convenient enough, and it is difficult to be applicable to more people, the following embodiments are optimized to overcome the defects existing in the prior art.
[0038] Embodiment
[0039] As shown in Figure 1 , Figure 2 , this embodiment provides a seat headrest that can be lifted and adjusted in two-stage rotation, including a base 1 for cooperating with the seat. A connecting member 2 is provided on the base 1. The tail of the connecting member 2 is deflected and cooperated with the base 1, and the head of the rod connecting member 2 is rotationally cooperated with the headrest frame 3. An elevating positioning structure is provided on the headrest frame 3, and the headrest frame 3 is adjusted in elevation relative to the head of the connecting member 2 through the elevating positioning structure.
[0040] For the seat headrest disclosed in this embodiment, two-stage rotation adjustment can be achieved by deflecting and adjusting between the base 1 and the connecting member 2, and by deflecting and adjusting between the connecting member 2 and the headrest frame 3. The elevation adjustment of the headrest frame 3 can be achieved through the elevating positioning structure. Combining and matching the adjustments can achieve a larger range of angle adjustments, so it can be suitable for more people. At the same time, the structure of this embodiment is stable and reliable, and can maintain stable use.
[0041] During deflection, the connecting member 2 can stop at a certain angle relative to the base 1 or the headrest frame 3, which can be achieved through various structures, but the specific structure is not uniquely limited. This embodiment is optimized and one feasible option is adopted: as shown in Figure 4 , Figure 5 , a deflection positioning structure is formed between the base 1 and the connecting member 2, and / or between the connecting member 2 and the headrest frame 3. The deflection positioning structure includes a deflection shaft forming meshing teeth, and further includes a positioning block 10 that forms meshing teeth and elastically abuts against the deflection shaft. When adopting such a scheme, through the meshing and abutting of the deflection shaft and the positioning block 10, the connecting member 2 can be fixed at a certain angle with the base 1 and the headrest frame 3, which is convenient for stable support after adjustment.
[0042] Specifically describe the deflection positioning structure. This embodiment adopts a deflection positioning structure scheme between the base 1 and the connecting member 2: a base positioning hole is provided on the base 1. The positioning block 10 is fitted into the base positioning hole, and an elastic force is provided by the base spring 13 to abut against the tail of the connecting member 2. The tail of the connecting member 2 forms a deflection shaft and cooperates with the positioning block 10 to achieve deflection positioning. When adopting such a scheme, a positioning shaft extending into the base positioning hole is provided on the positioning block 10. The base spring 13 is sleeved on the positioning shaft, and the base spring 13 is kept in a compressed state to always provide an abutting force to push the positioning block 10 towards the deflection shaft.
[0043] The deflection positioning structure is specifically described. This embodiment adopts a deflection positioning structure between the headrest frame 3 and the connecting member 2: the head of the connecting member 2 is provided with a connecting positioning hole 12, the positioning block 10 is matched to the connecting positioning hole 12 and the connecting spring 11 provides elastic force to press against the headrest frame 3, the headrest frame 3 forms a deflection axis and cooperates with the positioning block 10 to achieve deflection positioning. When such a solution is adopted, the positioning block 10 is also provided with a positioning shaft extending into the connecting positioning hole 12, the connecting spring 11 is sleeved on the positioning shaft, and the base spring 13 remains in a compressed state to always provide a pressing force to push the positioning block 10 toward the deflection axis.
[0044] During the deflection process, the deflection angles of the base 1, the connecting member 2 and the headrest frame 3 should be limited so that they can be deflected and adjusted within a reasonable range, thereby maintaining effective support and a stable and reliable structure. The deflection angle can be limited by a variety of solutions. This embodiment adopts one of the feasible options: Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, the base 1 and the tail of the connector 2, and / or the headrest frame 3 and the head of the connector 2 form a deflection limiting structure, and the deflection limiting structure includes a correspondingly arranged limiting pin 7 and a limiting groove 9, and a blocking protrusion 701 corresponding to the limiting groove 9 is formed on the limiting pin 7. When the base 1 deflects relative to the tail of the connector 2, and / or the headrest frame 3 deflects relative to the head of the connector 2, the blocking protrusion 701 fits with the end surface of the limiting groove 9 to prevent further deflection. When such a solution is adopted, the headrest frame 3 relative to the connector 2, and the connector 2 relative to the base 1 can maintain a pitch adjustment range of 75° in the longitudinal direction. With the deflection positioning structure, it can be achieved to maintain the positioning hovering after each rotation of a fixed angle value.
[0045] Preferably, Figure 2 As shown, the head of the headrest frame can be turned 45° downward and 30° upward relative to the head of the connecting member; the tail of the connecting member can be turned 30° downward and 45° upward relative to the base. Under this premise, the central angle of the meshing teeth of the connecting member and the headrest frame or the base is 15°, that is, a positioning gear can be switched every 15° deflection.
[0046] There are various options for the deflection limiting structure of the base 1 and the connecting member 2, and it is not uniquely defined. In this embodiment, optimization is carried out and one feasible option is adopted: Deflection connection holes 8 are correspondingly provided at the tails of the base 1 and the connecting member 2, and the limiting groove 9 extends along the circumference of the deflection connection hole 8. The limiting pin 7 is inserted into the deflection connection hole 8, and the blocking protrusion 701 extends into the limiting groove 9. When such a solution is adopted, the limiting groove 9 can be provided on the inner wall surface of the deflection connection hole 8 or on the outer circumference of the deflection connection hole 8, and the structure of the blocking protrusion 701 is correspondingly adjusted and matched.
[0047] Preferably, the limiting pin 7 is completely inserted into the deflection connection hole 8, and a decorative cover is also provided at the orifice of the deflection connection hole 8.
[0048] There are various options for the deflection limiting structure of the headrest frame 3 and the connecting member 2 and it is not uniquely defined. In this embodiment, optimization is carried out and one feasible option is adopted: Deflection connection holes 8 are correspondingly provided at the heads of the headrest frame 3 and the connecting member 2, and the limiting groove 9 extends along the circumference of the deflection connection hole 8. The limiting pin 7 is inserted into the deflection connection hole 8, and the blocking protrusion 701 extends into the limiting groove 9. Similarly, when such a solution is adopted, the limiting groove 9 can be provided on the inner wall surface of the deflection connection hole 8 or on the outer circumference of the deflection connection hole 8, and the structure of the blocking protrusion 701 is correspondingly adjusted and matched.
[0049] When performing lifting adjustment, there are various solutions to realize the lifting adjustment of the headrest frame 3. The specific solution is not uniquely defined. In this embodiment, optimization is carried out and one more feasible option is adopted: As Figure 3 、 Figure 4 shown, the lifting positioning structure includes a positioning plate and a lifting shaft 6 that are slidably matched correspondingly. An elastic positioning member and a number of positioning holes 401 are formed between the positioning plate and the lifting shaft 6. When the positioning plate and the lifting shaft 6 slide relatively up and down, the elastic positioning member is fitted and snapped into the corresponding positioning hole 401; A direction maintaining structure is also formed between the positioning plate and the lifting shaft 6. The direction maintaining structure includes a direction groove 402 and an orienting strip 601. The orienting strip 601 is snapped into the direction groove 402 to guide the relative directional sliding of the positioning plate and the lifting shaft 6. When such a solution is adopted, the elastic positioning member and the positioning holes 401 form a number of cooperation positions to achieve multi-position adjustment during the lifting adjustment process; Both the direction groove 402 and the orienting strip 601 are linear structures and the number is greater than or equal to one to keep the positioning plate and the lifting shaft sliding up and down along a straight line and prevent swinging.
[0050] The setting method of the positioning holes 401 and the elastic positioning member is not uniquely defined. In this embodiment, optimization is carried out and one feasible option is adopted: As Figure 7As shown, the positioning holes 401 are distributed at intervals along a straight line on the positioning plate. Mounting holes are provided on the lifting shaft 6 for mounting elastic positioning members. When such a solution is adopted, the elastic positioning member includes a positioning ball. The ball is connected to a positioning shaft and cooperates with a positioning spring. The positioning spring is always elastically deformed and pushes the ball towards the positioning hole 401.
[0051] As Figure 3 , Figure 6 , Figure 7 and Figure 8 As shown, the structure of the positioning plate is not uniquely limited either. In this embodiment, optimization is carried out and one of the feasible options is adopted: the positioning plate includes a front plate 4 and a rear plate 5. The front plate 4 and the rear plate 5 are arranged opposite to each other to form a gap. The lifting shaft 6 is clamped in the gap and slides relative to the gap. When such a solution is adopted, the lifting shaft 6 slides more stably and reliably in the gap.
[0052] The above are the implementation manners listed in this embodiment. However, this embodiment is not limited to the above optional implementation manners. Those skilled in the art can obtain many other implementation manners by arbitrarily combining the above manners. Anyone can obtain various other forms of implementation manners under the inspiration of this embodiment. The above specific implementation manners should not be construed as limiting the protection scope of this embodiment. The protection scope of this embodiment shall be defined by the claims.
Claims
1. A seat headrest capable of lifting and rotating in two stages, characterized in that: The invention comprises a base (1) for matching with a seat, a connecting piece (2) is arranged on the base (1), the tail of the connecting piece (2) is matched with the base (1) in a deflecting manner, and the head of the rod connecting piece (2) is matched with the headrest frame (3) in a rotational manner; the headrest frame (3) is provided with a lifting and positioning structure, and the lifting and positioning structure is used to adjust the lifting relative to the head of the connecting piece (2).
2. The seat headrest capable of lifting and rotating in two stages according to claim 1, characterized in that: A deflection positioning structure is formed between the base (1) and the connecting member (2), and / or between the connecting member (2) and the headrest frame (3), wherein the deflection positioning structure comprises a deflection shaft forming meshing teeth, and a positioning block (10) forming the meshing teeth and elastically pressed against the deflection shaft.
3. The seat headrest capable of lifting and rotating in two stages according to claim 2 is characterized in that: The base (1) is provided with a base positioning hole, the positioning block (10) is matched with the base positioning hole and the base spring (13) provides elastic force to press against the tail of the connecting member (2), the tail of the connecting member (2) forms a deflection axis and cooperates with the positioning block (10) to achieve deflection positioning.
4. The seat headrest capable of lifting and rotating in two stages according to claim 2 is characterized in that: The head of the connecting member (2) is provided with a connecting positioning hole (12), the positioning block (10) is matched with the connecting positioning hole (12) and the connecting spring (11) provides elastic force to press against the headrest frame (3), the headrest frame (3) forms a deflection axis and cooperates with the positioning block (10) to achieve deflection positioning.
5. The seat headrest capable of lifting and rotating in two stages according to any one of claims 1 to 4, characterized in that: The base (1) and the rear part of the connecting member (2), and / or the headrest frame (3) and the head part of the connecting member (2) form a deflection limiting structure, and the deflection limiting structure includes a correspondingly arranged limiting pin (7) and a limiting groove (9), and a blocking protrusion (701) corresponding to the limiting groove (9) is formed on the limiting pin (7). When the base (1) deflects relative to the rear part of the connecting member (2), and / or the headrest frame (3) deflects relative to the head part of the connecting member (2), the blocking protrusion (701) fits with the end surface of the limiting groove (9) to prevent further deflection.
6. The seat headrest capable of lifting and rotating in two stages according to claim 5, characterized in that: The base (1) and the tail of the connecting member (2) are both provided with a corresponding deflection connection hole (8), and the limiting groove (9) extends along the circumference of the deflection connection hole (8). The limiting pin (7) is inserted into the deflection connection hole (8), and the blocking protrusion (701) extends into the limiting groove (9).
7. The seat headrest capable of lifting and rotating in two stages according to claim 5, characterized in that: The headrest frame (3) and the head of the connecting member (2) are both provided with corresponding deflection connection holes (8), and the limiting groove (9) extends along the circumference of the deflection connection hole (8). The limiting pin (7) is inserted into the deflection connection hole (8), and the blocking protrusion (701) extends into the limiting groove (9).
8. The seat headrest capable of lifting and rotating in two stages according to claim 1, characterized in that: The lifting and positioning structure comprises a positioning plate and a lifting shaft (6) that are correspondingly slidably matched, an elastic positioning piece and a plurality of positioning holes (401) are formed between the positioning plate and the lifting shaft (6), and when the positioning plate and the lifting shaft (6) are relatively lifted and slid, the elastic positioning piece is engaged and snapped into the corresponding positioning hole (401); a direction retaining structure is also formed between the positioning plate and the lifting shaft (6), and the direction retaining structure comprises a direction groove (402) and an orientation bar (601), and the orientation bar (601) is snapped into the direction groove (402) to guide the positioning plate and the lifting shaft (6) to slide relative to each other in a directional manner.
9. The seat headrest capable of lifting and rotating in two stages according to claim 8, characterized in that: The positioning holes (401) are distributed at intervals along a straight line on the positioning plate, and the lifting shaft (6) is provided with mounting holes for mounting elastic positioning parts.
10. The seat headrest capable of lifting and rotating in two stages according to claim 8 or 9, characterized in that: The positioning plate comprises a front plate (4) and a rear plate (5), the front plate (4) and the rear plate (5) are arranged opposite to each other and form a gap, and the lifting shaft (6) is clamped in the gap and slides relative to the gap.