Seat headrest structure beneficial to adjustment

Abstract

The seat headrest structure comprises a supporting piece, a rotating piece, an adjusting rod and a headrest body, a first sliding hole is formed in the top of the supporting piece in the transverse hollow-out direction, the front side of the rotating piece is connected to the headrest body, and a second sliding hole is formed in the rear side of the rotating piece in the transverse hollow-out direction; the first sliding hole and the second sliding hole are coaxial and are connected in series through an adjusting rod; the adjusting rod can slide in the axial direction of the first sliding hole and the second sliding hole; a locking mechanism is arranged among the adjusting rod, the supporting piece and the rotating piece, the locking mechanism comprises clamping teeth and tooth grooves, the tooth grooves are formed in the inner walls of the first sliding hole and the second sliding hole, and at least two sets of clamping teeth are correspondingly arranged on the outer wall of the adjusting rod; the locking mechanism has a locking state and a movable state which can be freely switched, and in the locking state, tooth grooves in the first sliding hole and the second sliding hole are meshed with clamping teeth on the adjusting rod; in the movable state, the adjusting rod slides to the clamping teeth to at least break away from the tooth grooves in the second sliding holes.

Description

Technical Field

[0001] The utility model generally relates to the technical field of seats, and in particular to a seat headrest structure which is easy to adjust. Background Art

[0002] To maintain the health of the user's cervical spine, existing chairs typically feature headrests on the backrest. While seated, these headrests support the user's head, helping them adjust their posture while also reducing pressure on their neck, effectively alleviating neck fatigue and improving comfort while also protecting the health of their cervical spine. However, most existing chairs have fixed headrests. The shape of the back of the head varies greatly from user to user, resulting in a single headrest that doesn't fit the user's head well, resulting in poor support.

[0003] To address this issue, chairs with adjustable headrests are now available on the market. For example, a patented multi-directional headrest for a chair (Application No. 202022861095.X) features a rotating bracket connected to one end of a main bracket and rotatable along the same line. The headrest's main component is connected to the other end of the rotating bracket, allowing it to rotate relative to the main bracket. This allows users to adjust the headrest's pitch angle to their desired fit, ensuring a comfortable headrest support.

[0004] Furthermore, the two sides of the bottom edge of the swivel bracket are connected to the ends of the main bracket via small swivel parts. The teeth on the small swivel parts engage with the gear slots in the main bracket and the slots in the swivel bracket, so that the main bracket and the swivel bracket can remain relatively fixed, that is, the position of the headrest main part is fixed. And by simply pushing the small swivel parts on both sides inward to disengage the gear slots in the main bracket, the swivel bracket can be rotated and adjusted relative to the main bracket again, that is, the angle of the headrest main part can be adjusted. The movement and locking of the headrest body are controlled by the small swivel parts on both sides, and the structure is relatively simple.

[0005] However, the above solution has the following problem: to adjust the angle of the headrest, the user needs to press the left and right rotating parts simultaneously to disengage the teeth of the left and right rotating parts from the gear slots in the main bracket. Only then can the rotating bracket rotate and drive the headrest to rotate. This requires the user to stand up from the seat, then press the left and right rotating parts simultaneously with one hand and rotate the headrest with the other hand to adjust the angle, which makes the headrest angle adjustment operation extremely inconvenient. Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a seat headrest structure that is easy to adjust, in which the support member and the rotating member are connected in series by only one adjusting rod, so that only one end of the adjusting rod needs to be pressed to make the locking teeth on the adjusting rod disengage or engage with the tooth groove in the second sliding hole, thereby adjusting the movement or locking between the rotating member and the support member, thereby making the angle adjustment operation of the headrest body more convenient.

[0007] The effect of the utility model is achieved in this way:

[0008] The present application provides a seat headrest structure that is easy to adjust, including a support member, a rotating member, an adjustment rod and a headrest body, the support member is configured to be connected to the seat back, the top of the support member is provided with a first sliding hole along the horizontal hollowing, the front side of the rotating member is connected to the headrest body, and the rear side is provided with a second sliding hole along the horizontal hollowing; the first sliding hole and the second sliding hole are coaxial and connected in series through an adjustment rod, so that the rotating member is hinged to the support member, and the rotating member can drive the headrest body to rotate up and down relative to the support member; and the adjustment rod can slide along the axial direction of the first sliding hole and the second sliding hole; the adjustment rod, the support member and the rotating member A locking mechanism is provided between the rotating parts, and the locking mechanism includes mutually meshing teeth and tooth grooves, the inner walls of the first sliding hole and the second sliding hole are provided with tooth grooves, and the outer wall of the adjusting rod is correspondingly provided with at least two groups of teeth; the locking mechanism has a freely switchable locking state and an active state. In the locked state, the tooth grooves in the first sliding hole and the second sliding hole are engaged with the tooth grooves on the adjusting rod, so that the support part, the rotating part and the adjusting rod remain relatively fixed to each other; in the active state, the adjusting rod slides until the tooth grooves at least disengage from the tooth grooves in the second sliding hole, so that the rotating part can be rotated up and down relative to the support part again.

[0009] Furthermore, the top end of the support member protrudes to form two symmetrical hinges, each hinged to the left and right sides of the rotating member. The first sliding hole is formed in the hinge. This allows both the left and right sides of the rotating member to be constrained by the hinge, resulting in balanced forces on both sides of the rotating member, making the rotation and adjustment operation more stable and smooth.

[0010] Furthermore, the first sliding hole includes a connecting hole and a receiving slot that are interconnected. The connecting hole has a diameter smaller than the receiving slot and is located on a side closer to the rotating member. The adjusting rod includes a limiting portion at one of its left and right ends. The limiting portion has a diameter no larger than the connecting hole. The limiting portion penetrates the receiving slot through the connecting hole. Furthermore, a limiting plate is connected to the end of the limiting portion. The limiting plate has a diameter larger than the connecting hole and is configured to prevent the adjusting rod from disengaging from the hinge. By providing the limiting plate at the end of the limiting portion, the sliding distance of the adjusting rod is constrained, preventing the adjusting rod from sliding too far and disengaging from the hinge, thereby improving the stability of the adjustment operation.

[0011] Furthermore, a tooth groove is provided on the connecting hole near the limiting portion, and a latching tooth is provided on the limiting portion accordingly, so that in the locked state, the latching tooth on the limiting portion is more easily engaged with the tooth groove on the connecting hole, thereby improving the stability of the locking mechanism.

[0012] Furthermore, a cover-shaped end cap is secured within the receiving groove near the limiting portion. The hollow portion of the end cap forms a mounting portion, with the opening of the mounting portion facing the limiting portion. A return spring is disposed within the mounting portion, acting on the limiting piece to ensure that the adjustment rod always has a tendency to move away from the end cap. This not only ensures that the teeth on the adjustment rod are stably engaged in the tooth groove in the locked state, making them less likely to disengage under external forces, thus improving stability, but also that the adjustment rod automatically resets under the elastic force of the return spring until the teeth engage the tooth groove, further enhancing the convenience of adjusting the headrest body.

[0013] Furthermore, the end of the adjustment rod away from the stopper is an operating portion, which passes through the connection hole and horizontally extends beyond the receiving slot. This allows the user to control the adjustment rod by pressing the portion of the operating portion that extends beyond the receiving slot, further enhancing the convenience of adjusting the headrest body.

[0014] Furthermore, the sidewall of the operating portion protrudes outward to form an abutment portion, the diameter of which is similar to that of the receiving slot. When in an active state, the abutment portion is configured to abut the bottom of the receiving slot to prevent the adjustment rod from sliding too deeply. This abutment portion not only covers the receiving slot, giving the support a more integrated and aesthetically pleasing appearance, but also abuts the bottom of the receiving slot in an active state to prevent the adjustment rod from sliding too deeply, thereby ensuring a smoother and more stable adjustment operation of the locking mechanism.

[0015] Furthermore, a cover plate is provided at the front end of the headrest body, and the rear end of the cover plate is recessed, forming a sliding groove running horizontally between the headrest body and the cover plate. The rotating member includes a columnar support member connecting portion and a headrest connecting portion symmetrically arranged on the support member connecting portion. A second sliding hole is provided in the support member connecting portion. A sliding support member is hinged between the two headrest connecting portions. The sliding support member passes through the sliding groove, allowing the headrest body to slide up and down relative to the rotating member through the sliding groove. This allows the headrest body to further rotate forward and backward relative to the rotating member to adjust the angle and slide up and down to adjust the height, thereby providing a higher degree of adjustment freedom for the headrest body, meeting the needs of more users and improving practicality.

[0016] Furthermore, a protruding head is formed on the rear end of the sliding support, and a plurality of vertically arranged slots are recessed in the front end of the headrest body. As the sliding support member slides up and down along the sliding slots, the head engages with the slots in sequence, thereby achieving gear adjustment. This makes the height adjustment of the headrest body more gear-sensitive and allows the headrest body to hover at any height, improving the stability of the headrest body height adjustment operation.

[0017] Furthermore, a positioning portion protrudes from the front end of the headrest body, which is covered by a cover plate. Two symmetrical positioning members protrude from the sliding support, respectively fitting over the left and right ends of the positioning portion. This enhances the connection strength between the headrest body and the sliding support, preventing the headrest body from rocking relative to the sliding support during sliding, further enhancing the stability of the headrest body height adjustment operation.

[0018] The easily adjustable seat headrest structure provided by this application utilizes a single adjustment rod to connect the support member and the rotating member in series. The user can adjust the movement or locking between the rotating member and the support member simply by pushing the adjustment rod, causing the locking teeth on the adjustment rod to disengage or engage with the teeth in the second sliding hole. Thus, when adjusting the angle of the headrest body, the user can simply push the adjustment rod with one hand and rotate the headrest body with the other hand without having to get up from the seat, making the operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a seat headrest structure that is easy to adjust provided in an embodiment of the present application;

[0021] Figure 2 A schematic side view of the seat headrest structure provided in an embodiment of the present application;

[0022] Figure 3 A schematic side view of the seat headrest structure when the rotating member provided in an embodiment of the present application rotates upward;

[0023] Figure 4 This is a schematic diagram of the side structure of the seat headrest structure when the headrest body provided by an embodiment of the present application slides downward;

[0024] Figure 5 A schematic diagram of the connection structure between the support member and the rotating member provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of the cross-sectional structure between the support member and the rotating member provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the change process of the adjustment lever when switching from the locked state to the active state provided in an embodiment of the present application;

[0027] Figure 8 Schematic diagram of the connection structure between the headrest body and the sliding support member provided in an embodiment of the present application.

[0028] The figures are marked as follows: 1-support member, 101-tooth groove, 110-first sliding hole, 110a-connecting part, 110b-accommodating part, 120-hinge part, 130-end cover, 131-installing part, 2-rotating member, 210-second sliding hole, 220-support member connecting part, 230-headrest connecting part, 3-adjusting rod, 310-grip, 320-limiting part, 321-limiting plate, 330-operating part, 331-abutting part, 4-headrest body, 401-sliding groove, 402-grip, 410-cover plate, 420-sliding support member, 421-clamp, 422-positioning member, 430-positioning part. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0030] Please refer to the attached Figure 1-8The embodiment of the present application provides a seat headrest structure that is easy to adjust, including a support member 1, a rotating member 2, an adjustment rod 3 and a headrest body 4. The support member 1 is configured to connect to the seat back, and a first sliding hole 110 is provided along the horizontal hollowing of the top of the support member 1. The front side of the rotating member 2 is connected to the headrest body 4, and a second sliding hole 210 is provided along the horizontal hollowing of the rear side; the first sliding hole 110 and the second sliding hole 210 are coaxial and connected in series through an adjustment rod 3, so that the rotating member 2 is hinged to the support member 1, and the rotating member 2 can drive the headrest body 4 to rotate up and down relative to the support member 1; and the adjustment rod 3 can slide along the axial direction of the first sliding hole 110 and the second sliding hole 210; the adjustment rod 3 and the support member 1 and the rotating member 2 are connected. A locking mechanism is provided between the support member 1 and the rotating member 2, which includes mutually meshing teeth 310 and tooth grooves 101. The inner walls of the first sliding hole 110 and the second sliding hole 210 are both provided with tooth grooves 101, and the outer wall of the adjusting rod 3 is correspondingly provided with at least two groups of teeth 310; the locking mechanism has a freely switchable locking state and an active state. In the locked state, the tooth grooves 101 in the first sliding hole 110 and the second sliding hole 210 are both engaged with the tooth grooves 310 on the adjusting rod 3, so that the support member 1, the rotating member 2 and the adjusting rod 3 remain relatively fixed to each other; in the active state, the adjusting rod 3 slides until the tooth 310 is at least disengaged from the tooth groove 101 in the second sliding hole 210, so that the rotating member 2 can be rotated up and down relative to the support member 1 again.

[0031] In this embodiment, the support member 1 and the rotating member 2 are connected in series via a single adjustment rod 3. The movable or locked relationship between the rotating member 2 and the support member 1 can be adjusted simply by pushing the adjustment rod 3 so that the latching teeth 310 on the adjustment rod 3 disengage or engage with the tooth grooves 101 within the second sliding hole 210. Thus, the user can adjust the angle of the headrest body 4 without having to get up from their seat. They can simply push the adjustment rod 3 with one hand and rotate the headrest body 4 with the other hand, making the adjustment more convenient.

[0032] Please refer to the attached Figure 5-7 In some embodiments of the present application, the top end of the support member 1 protrudes to form two left-right symmetrical hinged portions 120 , the two hinged portions 120 are respectively hinged to the left and right sides of the rotating member 2 and the first sliding hole 110 is opened in the hinged portion 120 .

[0033] In this embodiment, by setting the support member 1 as a U-shaped structure, when the rotating member 2 rotates relative to the support member 1, the left and right sides of the rotating member 2 will be constrained by the hinge part 120, so that the forces on the left and right sides of the rotating member 2 are balanced, and the rotation adjustment operation is more stable and smooth.

[0034] Please refer to the attached Figure 5-7In some embodiments of the present application, the first sliding hole 110 includes a connecting hole 110a and a receiving groove 110b that are interconnected. The diameter of the connecting hole 110a is smaller than the receiving groove 110b and the connecting hole 110a is located on the side close to the rotating member 2; the adjusting rod 3 includes a limiting portion 320 at one of the left and right ends. The diameter of the limiting portion 320 is not larger than the connecting hole 110a. The limiting portion 320 penetrates into the receiving groove 110b through the connecting hole 110a, and the end of the limiting portion 320 is also connected to a limiting plate 321. The diameter of the limiting plate 321 is larger than the connecting hole 110a. The limiting plate 321 is configured to prevent the adjusting rod 3 from detaching from the hinge portion 120.

[0035] In this embodiment, by providing a limiting plate 321 at the end of the limiting portion 320, when the user pushes the adjusting rod 3 to lock or unlock, the limiting plate 321 can abut against the bottom of the accommodating groove 110b, thereby restricting the sliding distance of the adjusting rod 3 and preventing the adjusting rod 3 from sliding too far and detaching from the hinge portion 120.

[0036] Please refer to the attached Figure 6-7 In some embodiments of the present application, a tooth groove 101 is provided on the connection hole 110 a near the side of the limiting portion 320 , and a latching tooth 310 is correspondingly provided on the limiting portion 320 .

[0037] In this embodiment, by providing a tooth groove 101 on the connecting hole 110a, the diameter of the connecting hole 110a is close to the limiting portion 320, so that in the locked state, the locking tooth 310 on the limiting portion 320 is more easily inserted into and engaged with the tooth groove 101 on the connecting hole 110a, thereby improving the stability of the locking mechanism.

[0038] Of course, in other embodiments of the present application, the tooth groove 101 may also be provided in the receiving groove 110 b close to the side of the limiting portion 320 .

[0039] Please refer to the attached Figure 5-7 In some embodiments of the present application, a cover-shaped end cap 130 is clamped in the accommodating groove 110b near the side of the limiting portion 320, and the hollow portion of the end cap 130 forms a mounting portion 131. The opening of the mounting portion 131 faces the limiting portion 320. A return spring is arranged in the mounting portion 131, and the return spring acts on the limiting piece 321, so that the adjusting rod 3 always has a tendency to move in the direction away from the end cap 130.

[0040] In this embodiment, by providing an end cover 130 on the accommodating groove 110b, not only the first sliding groove 110 is covered, making the support member 1 more integrated and beautiful in appearance; by providing a reset spring in the mounting portion 131, not only the latching tooth 310 on the adjusting rod 3 can be stably engaged in the tooth groove 101 in the locked state, and is not easily disengaged from the tooth groove 101 under the influence of external force, thus having better stability, but also after the user adjusts the headrest body 4 to a suitable angle, there is no need to manually pull the adjusting rod 3 to the locked state. The adjusting rod 3 will automatically reset under the elastic force of the reset spring until the latching tooth 310 is engaged in the tooth groove 101, further improving the convenience of the adjustment operation of the headrest body 4.

[0041] Please refer to the attached Figure 5-7 In some embodiments of the present application, the end of the adjustment lever 3 away from the stopper 320 is an operating portion 330. The operating portion 330 passes through the connection hole 110a and, horizontally, extends beyond the receiving slot 110b. This allows the user to control the adjustment lever 3 by pressing the portion of the operating portion 330 extending beyond the receiving slot 110b, further enhancing the convenience of adjusting the headrest body 4.

[0042] Please refer to the attached Figure 5-7 In some embodiments of the present application, the side wall of the operating portion 330 protrudes outward to form an abutment portion 331, and the diameter of the abutment portion 331 is similar to the diameter of the accommodating groove 110b; the abutment portion 331 is configured to abut the bottom of the accommodating groove 110b in an active state to prevent the adjusting rod 3 from sliding too deep.

[0043] In this embodiment, an abutment portion 331 is formed by protruding from the outer wall of the operating portion 330. The abutment portion 331 can not only cover the accommodating groove 110b, making the support member 1 more integrated and beautiful in appearance, but also in the active state, the abutment portion 331 abuts against the bottom of the accommodating groove 110b to prevent the adjusting rod 3 from sliding too deep, thereby making the adjustment operation of the locking mechanism more stable and smooth.

[0044] Please refer to the attached Figure 1 In some embodiments of the present application, a cover plate 410 is provided at the front end of the headrest body 4, and the rear end of the cover plate 410 is recessed, so that a sliding groove 401 running through the headrest body 4 and the cover plate 410 is formed; the rotating member 2 includes a columnar support member connecting portion 220 and a headrest connecting portion 230 symmetrically arranged on the left and right of the support member connecting portion 220, the second sliding hole 210 is provided in the support member connecting portion 220, and a sliding support member 420 is hinged between the two headrest connecting portions 230, and the sliding support member 420 passes through the sliding groove 401, so that the headrest body 4 can slide up and down relative to the rotating member 2 through the sliding groove 401.

[0045] In this embodiment, the sliding support member 420 is hinged at the front end of the rotating member 2, and the headrest body 4 can slide up and down relative to the sliding support member 420, so that the headrest body 4 can be further rotated back and forth relative to the rotating member 2 to adjust the angle and slide up and down to adjust the height, thereby making the adjustment freedom of the headrest body 4 higher, meeting the usage needs of more users, and being more practical.

[0046] Please refer to the attached Figure 8 In some embodiments of the present application, the rear end of the sliding support member 420 is protruded to form a clamping head 421, and the front end of the headrest body 4 is recessed to provide a plurality of clamping slots 402 arranged in the vertical direction. When the sliding support member 420 slides up and down along the sliding slot 401, the clamping head 421 is engaged with the plurality of clamping slots 402 in turn, thereby realizing gear adjustment.

[0047] In this embodiment, by providing a mutually engaging clamping head 421 and a clamping slot 402 between the sliding support member 420 and the sliding slot 401, the height adjustment operation of the headrest body 4 is made more gear-sensitive, and the headrest body 4 can be suspended at any height, thereby improving the stability of the height adjustment operation of the headrest body 4.

[0048] Among them, preferably, a clamping head 421 is provided on both sides of the left and right sides of the sliding support 420, and two rows of left-right symmetrical clamping grooves 402 are correspondingly provided on the headrest body 4, so that when the headrest body 4 slides up and down, the left and right sides of the headrest body 4 are constrained by the sliding support 420, thereby improving the connection strength between the two, thereby further improving the stability of the height adjustment operation of the headrest body 4.

[0049] Please refer to the attached Figure 8 In some embodiments of the present application, a positioning portion 430 is formed on the front end of the headrest body 4, and the cover plate 410 is covered on the positioning portion 430. Two left-right symmetrical positioning members 422 are protruded from the sliding support member 420, and the two positioning members 422 are respectively attached to the left and right ends of the positioning portion 430.

[0050] In this embodiment, when the headrest body 4 slides up and down relative to the sliding support member 420, the positioning portion 430 is limited by the positioning members 422 on the left and right sides, thereby improving the connection strength between the headrest body 4 and the sliding support member 420, so that the headrest body 4 cannot rock left and right relative to the sliding support member 420 during the sliding process, thereby further improving the stability of the height adjustment operation of the headrest body 4.

[0051] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means more than three.

[0052] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A seat headrest structure that is easy to adjust, characterized in that: The invention comprises a support member (1), a rotating member (2), an adjusting rod (3) and a headrest body (4), wherein the support member (1) is configured to be connected to a chair back, a first sliding hole (110) is provided on the top of the support member (1) along a transverse hollowing, a front side of the rotating member (2) is connected to the headrest body (4), and a second sliding hole (210) is provided on the rear side along a transverse hollowing; the first sliding hole (110) and the second sliding hole (210) are coaxial and connected in series through an adjusting rod (3), so that the rotating member (2) is hinged to the support member (1), and the rotating member (2) can drive the headrest body (4) to rotate up and down relative to the support member (1); and the adjusting rod (3) can slide axially along the first sliding hole (110) and the second sliding hole (210); a locking mechanism is provided between the adjusting rod (3), the support member (1) and the rotating member (2), and the ... The fixing mechanism comprises mutually meshing latches (310) and tooth grooves (101), the inner walls of the first sliding hole (110) and the second sliding hole (210) are both provided with the tooth grooves (101), and the outer wall of the adjusting rod (3) is correspondingly provided with at least two groups of the latches (310); the locking mechanism has a freely switchable locking state and an active state, in the locking state, the tooth grooves (101) in the first sliding hole (110) and the second sliding hole (210) are both meshed with the latches (310) on the adjusting rod (3), so that the support member (1), the rotating member (2) and the adjusting rod (3) remain relatively fixed to each other; in the active state, the adjusting rod (3) slides until the latches (310) at least disengage from the tooth grooves (101) in the second sliding hole (210), so that the rotating member (2) can rotate up and down relative to the support member (1) again.

2. The adjustable seat headrest structure according to claim 1, characterized in that: The top end of the support member (1) protrudes to form two hinged portions (120) that are symmetrical on the left and right. The two hinged portions (120) are hinged to the left and right sides of the rotating member (2) respectively, and the first sliding hole (110) is opened in the hinged portions (120).

3. The adjustable seat headrest structure according to claim 2, characterized in that: The first sliding hole (110) includes a connecting hole (110a) and a receiving groove (110b) that are interconnected, the connecting hole (110a) has a diameter smaller than that of the receiving groove (110b), and the connecting hole (110a) is located on a side close to the rotating member (2); the adjusting rod (3) includes a limiting portion (320) at one of the left and right ends, the limiting portion (320) has a diameter no larger than that of the connecting hole (110a), the limiting portion (320) penetrates into the receiving groove (110b) through the connecting hole (110a), and the end of the limiting portion (320) is further connected to a limiting plate (321), the limiting plate (321) has a diameter larger than that of the connecting hole (110a), and the limiting plate (321) is configured to prevent the adjusting rod (3) from detaching from the hinge portion (120).

4. The adjustable seat headrest structure according to claim 3, characterized in that: The tooth groove (101) is provided on the connection hole (110a) on one side close to the limiting portion (320), and the latching teeth (310) are correspondingly provided on the limiting portion (320).

5. The adjustable seat headrest structure according to claim 3, characterized in that: A cover-shaped end cap (130) is clamped in the accommodating groove (110b) on one side close to the limiting portion (320), and a mounting portion (131) is formed in the hollow portion of the end cap (130). The opening of the mounting portion (131) faces the limiting portion (320). A return spring is provided in the mounting portion (131), and the return spring acts on the limiting piece (321), so that the adjusting rod (3) always has a tendency to move in a direction away from the end cap (130).

6. The adjustable seat headrest structure according to claim 3, characterized in that: One end of the regulating rod (3) away from the limiting portion (320) is an operating portion (330), the operating portion (330) passes through the connecting hole (110a), and in the horizontal direction, a portion of the operating portion (330) exceeds the accommodating groove (110b).

7. The adjustable seat headrest structure according to claim 6, characterized in that: The side wall of the operating portion (330) protrudes outward to form an abutment portion (331), the diameter of the abutment portion (331) being similar to the diameter of the accommodating groove (110b); the abutment portion (331) is configured to abut against the bottom of the accommodating groove (110b) in an active state to prevent the adjusting rod (3) from sliding in too deeply.

8. The adjustable seat headrest structure according to claim 1, characterized in that: The front end of the headrest body (4) is provided with a cover plate (410), and the rear end of the cover plate (410) is recessed, so that a sliding groove (401) that runs through the headrest body (4) and the cover plate (410) is formed; the rotating member (2) includes a columnar support member connecting portion (220) and a headrest connecting portion (230) symmetrically arranged on the support member connecting portion (220); the second sliding hole (210) is provided on the support member connecting portion (220), and a sliding support member (420) is hinged between the two headrest connecting portions (230), and the sliding support member (420) passes through the sliding groove (401), so that the headrest body (4) can slide up and down relative to the rotating member (2) through the sliding groove (401).

9. The adjustable seat headrest structure according to claim 8, characterized in that: The rear end of the sliding support member (420) is protruded to form a clamping head (421), and the front end of the headrest body (4) is recessed to form a plurality of clamping slots (402) arranged in a vertical direction. When the sliding support member (420) slides up and down along the sliding slots (401), the clamping head (421) is sequentially engaged with the plurality of clamping slots (402), thereby achieving gear adjustment.

10. The adjustable seat headrest structure according to claim 8, characterized in that: A positioning portion (430) is formed on the front end of the headrest body (4), the cover plate (410) is covered on the positioning portion (430), and two left-right symmetrical positioning members (422) are protruded from the sliding support member (420), and the two positioning members (422) are respectively attached to the left and right ends of the positioning portion (430).

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