Liftable and rotatable seat headrest

Abstract

The utility model relates to the technical field of ergonomic seats, in particular to a liftable and rotatable seat headrest which comprises a mounting base, a supporting component, a telescopic component and a headrest body, the mounting base is used for connecting a seat; the bottom of the supporting part is rotationally connected with the mounting base through a first rotating mechanism; one end of the telescopic assembly is rotationally connected with the top of the supporting part through a second rotating mechanism; the headrest body is rotationally connected with one end of the telescopic assembly through a third rotating mechanism. The multi-direction adjustable headrest has the advantages that the headrest can be adjusted in multiple directions through matching of the components, and the adjusting range of the headrest is greatly enlarged.

Description

Technical Field

[0001] This utility model relates to the field of ergonomic chair technology, and in particular to a height-adjustable and rotatable headrest. Background Technology

[0002] As people demand higher levels of comfort in their work environments, ergonomic chairs have become essential office furniture. To provide more comfortable support for the head, most office chairs have headrests with adjustable height. However, current ergonomic chair headrests on the market have issues with limited adjustable angles and short adjustable travel. Furthermore, there are significant differences in body size and sitting posture among individuals. Therefore, existing ergonomic chair headrests are gradually failing to meet the diverse adjustment needs of the public.

[0003] Therefore, the current headrests still have room for improvement and should be adjusted to meet the needs of a wider range of users. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a height-adjustable and rotatable seat headrest.

[0005] The purpose of this utility model is achieved through the following technical solution: a height-adjustable and rotatable seat headrest, comprising a mounting base, a support component, a telescopic assembly, and a headrest body; the mounting base is used to connect to a seat; the bottom of the support component is rotatably connected to the mounting base via a first rotating mechanism; one end of the telescopic assembly is rotatably connected to the top of the support component via a second rotating mechanism; the headrest body is rotatably connected to one end of the telescopic assembly via a third rotating mechanism.

[0006] This utility model allows the supporting component to rotate to adjust its angle through a first rotating mechanism; the telescopic component to rotate to adjust its angle through a second rotating mechanism; and the headrest body to rotate to adjust its angle through a third rotating mechanism. The telescopic component allows the distance of the headrest body to be adjusted. Through these various rotating and telescopic adjustments, diverse adjustment needs can be met.

[0007] In some embodiments, the first rotating mechanism includes a first hinge seat disposed on the mounting base and a first hinge lug disposed at the bottom of the support member, the first hinge seat and the first hinge lug being hinged together by a first hinge pin. The first rotating mechanism allows the support member to rotate and adjust its angle.

[0008] In some embodiments, the telescopic assembly includes a telescopic seat and a telescopic rod; the telescopic seat is rotatably connected to the top of the support member via a second rotating mechanism, one end of the telescopic rod is slidably disposed within the telescopic seat, and the headrest body is rotatably connected to one end of the telescopic rod via a third rotating mechanism. The third rotating mechanism allows for adjustment of the headrest body distance.

[0009] In some embodiments, the telescopic assembly further includes a telescopic toothed mechanism, the telescopic toothed mechanism including a first elastic member and a toothed block;

[0010] The telescopic seat is provided with a mounting cover that communicates with the inner cavity of the telescopic seat. The mounting cover is provided with a first mounting groove. The toothed block is slidably disposed in the first mounting groove. The sliding direction of the toothed block is perpendicular to the telescopic direction of the telescopic rod. The first elastic member is disposed at the bottom of the first mounting groove. The first elastic member abuts against the toothed block so that the toothed block abuts against the telescopic rod.

[0011] The telescopic rod is provided with a toothed rack for engaging with the toothed block, and the cross-section of the toothed rack is wavy.

[0012] The telescopic toothed mechanism creates a tactile feedback when adjusting the headrest's distance.

[0013] In some embodiments, the telescopic assembly further includes an anti-retraction mechanism, which includes a pawl, a pin, and a torsion spring. The pin is disposed within the mounting cover, the middle portion of the pawl is rotatably connected to the pin, and the torsion spring is disposed on the pin. One end of the torsion spring abuts against the mounting cover, and the other end abuts against the pawl, causing the pawl to abut against the telescopic rod. The telescopic rod is provided with a ratchet rack that engages with the pawl. After the headrest distance is adjusted, the anti-retraction mechanism prevents the telescopic assembly from retracting when the headrest body supports the head.

[0014] In some embodiments, the anti-retraction mechanism further includes a reset component;

[0015] The mounting cover is provided with a second mounting groove, and the reset component is slidably disposed in the second mounting groove, with its sliding direction being consistent with the extension and retraction direction of the telescopic rod;

[0016] The reset component is provided with an actuating post, and a sliding groove is provided on the side of the ratchet on the telescopic rod, with the end of the actuating post located in the sliding groove;

[0017] The reset component is also provided with a boss for abutting the pawl. The boss abuts the pawl, causing the pawl to rotate along the pin shaft and thus disengaging the pawl from the rack. By providing the reset component, the telescopic assembly can retract after reaching its maximum extension, facilitating adjustment.

[0018] In some embodiments, the second rotating mechanism includes a second hinge lug disposed on the telescopic base and a second hinge seat disposed on the top of the support member, the second hinge seat and the second hinge lug being hinged by a second hinge pin. By providing the second rotating mechanism, the telescopic assembly can rotate relative to the support member.

[0019] In some embodiments, the second rotating mechanism further includes a rotation limiting mechanism, which includes a limiting block. The limiting block is coaxially fixed within the hinge hole of the second hinge ear. The end of the limiting block extends out of the hinge hole of the second hinge ear and is inserted into the second hinge seat. The limiting block is rotatably connected to the second hinge seat. A limiting boss is provided around the periphery of the limiting block, extending into the second hinge seat. The second hinge seat is provided with a limiting groove corresponding to the limiting boss, the width of which is greater than the width of the limiting boss, allowing the limiting block to rotate relative to the second hinge seat. By providing the rotation limiting mechanism, the supporting component and the telescopic assembly can rotate within a set angle range.

[0020] In some embodiments, the headrest body is provided with a third hinge seat, the extended end of the telescopic rod is provided with a third hinge ear, and the third hinge seat and the third hinge ear are hinged together by a third hinge shaft.

[0021] In some embodiments, the third rotating mechanism further includes a rotating tooth sensing mechanism, the rotating tooth sensing mechanism including an end tooth and a second elastic component;

[0022] The end tooth is sleeved on the third hinge shaft, and the end tooth is axially slidably disposed in the hinge hole of the third hinge ear. The end tooth is circumferentially locked with the third hinge ear. The end face of one end of the end tooth is detachably in contact with the third hinge seat and is provided with a first end tooth. The third hinge seat is provided with a second end tooth that mates with the first end tooth.

[0023] The second elastic component is located within the hinge hole of the third hinge ear and sleeved on the third hinge shaft. One end of the second elastic component is limited by the third hinge shaft, and the other end abuts against the end gear, causing the first end gear and the second end gear to mesh. By rotating the gear-feel mechanism, a scale-like feel is formed in the headrest body during the rotation adjustment process.

[0024] This utility model has the following advantages:

[0025] This invention forms three rotatable joints through a support component, a telescopic assembly, and a main body, achieving a three-stage rotation adjustment function; and by setting a telescopic assembly for telescopic adjustment, it achieves a three-stage telescopic adjustment function, which can meet diverse adjustment needs. Attached Figure Description

[0026] Figure 1 This is a side view of the height-adjustable and rotatable headrest of the present invention;

[0027] Figure 2 This is an exploded view of the height-adjustable and rotatable headrest of the present invention.

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of the telescopic component of this utility model;

[0030] Figure 5 This is a cross-sectional view of the telescopic component of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the second rotating mechanism of this utility model;

[0032] Figure 7 This is a cross-sectional view of the second rotating mechanism of this utility model;

[0033] Figure 8 This is a cross-sectional view of the first rotating mechanism of this utility model;

[0034] Figure 9 This is a cross-sectional view of the third rotating mechanism of this utility model;

[0035] In the diagram: 1. Mounting base; 2. Support component; 3. First rotating mechanism; 31. First hinge seat; 32. First hinge ear; 33. First hinge pin; 34. Damping block; 4. Telescopic assembly; 41. Telescopic seat; 42. Telescopic rod; 421. Rack; 422. Racket; 423. Slide groove; 431. Mounting cover; 4311. First mounting groove; 4312. Second mounting groove; 432. First elastic component; 433. Rack; 434. Torsion spring; 435. Pin; 436. Reset component; 4361. 4362, Boss; 437, Pawl; 437, Pawl; 5, Second Rotation Mechanism; 51, Second Hinge Seat; 511, Limiting Groove; 52, Second Hinge Ear; 53, Second Hinge Shaft; 54, Limiting Block; 541, Limiting Boss; 6, Third Rotation Mechanism; 61, Third Hinge Seat; 611, Second End Tooth; 62, Third Hinge Ear; 63, Third Hinge Shaft; 631, Third Hinge Shaft Body; 632, Sleeve; 64, Second Elastic Component; 65, End Tooth; 651, First End Tooth; 7, Headrest Body. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0038] like Figures 1-9 As shown, a height-adjustable and rotatable seat headrest includes a mounting base 1, a support component 2, a telescopic assembly 4, and a headrest body 7. The mounting base 1 is used to connect to the seat. The bottom of the support component 2 is rotatably connected to the mounting base 1 through a first rotating mechanism 3. One end of the telescopic assembly 4 is rotatably connected to the top of the support component 2 through a second rotating mechanism 5. The headrest body 7 is rotatably connected to one end of the telescopic assembly 4 through a third rotating mechanism 6.

[0039] Specifically, in this embodiment, the mounting base 1 is used to fix the headrest to the ergonomic chair. The support component 2 is rotatably connected to the mounting base 1 via the first rotating mechanism 3, allowing the support component 2 to rotate relative to the mounting base 1, thus achieving a first-order rotation function. The telescopic component 4 is rotatably connected to the support component 2 via the second rotating mechanism 5, achieving a second-order rotation function. Simultaneously, the telescopic component 4 can extend and retract to change its length, achieving a lifting function. The headrest body 7 is rotatably connected to the telescopic component 4 via the third rotating mechanism 6, achieving a third-order rotation function. This embodiment, by providing three-order rotation and telescopic functions, greatly improves the angle and travel adjustment range of the headrest.

[0040] The first rotating mechanism 3 includes a first hinge seat 31 disposed on the mounting base 1 and a first hinge ear 32 disposed at the bottom of the support member 2. The first hinge seat 31 and the first hinge ear 32 are hinged together by a first hinge shaft 33.

[0041] Specifically, in this embodiment, the support member 2 is provided with two hinge ears; the first hinge shaft 33 is a hinge hole bolt, and the threaded end of the first hinge shaft 33 is threadedly connected to the support member 2.

[0042] The first rotating mechanism 3 also includes a damping structure, which includes a damping block 34 and a damping spring. The damping block 34 is sleeved on the first hinge shaft 33 and located in the hinge hole of the first hinge lug 32.

[0043] The damping block 34 is cylindrical in shape, with milled surfaces on its cylindrical surface. A milled surface is also provided inside the hinge hole of the first hinge ear 32. The milled surfaces on the damping block 34 and the milled surfaces inside the hinge hole of the first hinge ear 32 engage to circumferentially lock the damping block 34 to the hinge hole of the first hinge ear 32. The damping block 34 can also slide axially within the hinge hole of the first hinge ear 32. A damping spring is fitted onto the hinge hole bolt, with one end abutting the bolt head and the other end abutting the damping block 34, causing the damping block 34 to abut against the first hinge seat 31. The damping block 34 and the first hinge seat 31 abut against each other and generate friction, providing damping between the support component 2 and the mounting base 1 to maintain their relative angle in a free state.

[0044] The telescopic assembly 4 includes a telescopic seat 41 and a telescopic rod 42; the telescopic seat 41 is rotatably connected to the top of the support component 2 through a second rotating mechanism 5, one end of the telescopic rod 42 is slidably disposed inside the telescopic seat 41, and the headrest body 7 is rotatably connected to the end of the telescopic rod 42 located outside the telescopic seat 41 through a third rotating mechanism 6.

[0045] The telescopic component 4 also includes a telescopic tooth sensing mechanism, which includes a first elastic component 432 and a toothed block 433.

[0046] The telescopic base 41 is provided with a mounting cover 431 that communicates with the inner cavity of the telescopic base 41. Specifically, the telescopic base 41 has a hole that communicates with the inner cavity of the telescopic base 41, and the mounting cover 431 is fixedly installed over the hole. The mounting cover 431 is provided with a first mounting groove 4311, and the toothed block 433 is slidably disposed in the first mounting groove 4311. The sliding direction of the toothed block 433 is perpendicular to the telescopic direction of the telescopic rod 42. The first elastic member 432 is disposed at the bottom of the first mounting groove 4311, and the first elastic member 432 abuts against the toothed block 433 so that the toothed block 433 abuts against the telescopic rod 42. In this embodiment, the first elastic member 432 is a spring.

[0047] The telescopic rod 42 is provided with a toothed rack 421 for engaging with the toothed block 433, and the cross-section of the toothed rack 421 is wavy. In this embodiment, the first elastic member 432 ensures that the toothed block 433 always abuts against the toothed rack 421. At the same time, the tooth surface of the toothed rack 421 is set to be wavy, so that when the telescopic rod 42 is pulled by an external force, the wavy toothed rack 421 can intermittently push the toothed block 433 away to form a scale feel.

[0048] The telescopic assembly 4 also includes an anti-retraction mechanism, which includes a pawl 437, a pin 435, and a torsion spring 434. The pin 435 is disposed inside the mounting cover 431. The middle part of the pawl 437 is rotatably connected to the pin 435. The torsion spring 434 is disposed on the pin 435. One end of the torsion spring 434 abuts against the mounting cover 431, and the other end abuts against the pawl 437, causing the pawl 437 to abut against the telescopic rod 42. The telescopic rod 42 is provided with a ratchet rack 422 that meshes with the pawl 437.

[0049] Specifically, in this embodiment, two ratchet racks 422 are provided, respectively located on both sides of the ratchet rack 421 and aligned with the direction of the ratchet rack 421, with the tooth surfaces of the ratchet racks 422 protruding beyond the tooth surfaces of the ratchet rack 421. Correspondingly, in this embodiment, a pawl 437 is located on the rear side of the ratchet block. The width of the ratchet block is smaller than the distance between the two ratchet racks 422, so that the ratchet block engages with the ratchet rack 422. The width of the pawl 437 is greater than the distance between the two ratchet racks 422, so that the pawl 437 engages with the ratchet rack 422. After adjusting the length of the telescopic component 4, since the headrest body 7 needs to support the human head, an anti-retraction mechanism is provided to prevent the headrest body 7 from retracting under the pressure of the head.

[0050] The anti-retraction mechanism also includes a reset component 436;

[0051] The mounting cover 431 is provided with a second mounting groove 4312, and the reset component 436 is slidably disposed in the second mounting groove 4312, and its sliding direction is consistent with the extension and retraction direction of the telescopic rod 42.

[0052] The reset component 436 is provided with a toggle post 4361, and the side of the ratchet 422 on the telescopic rod 42 is provided with a sliding groove 423, and the end of the toggle post 4361 is located in the sliding groove 423.

[0053] The reset component 436 is also provided with a boss 4362 for abutting against the pawl 437. The boss 4362 is used to abut against the pawl 437 to make the pawl 437 rotate along the pin 435 and then disengage from the ratchet rack 422.

[0054] Specifically, in this embodiment, the reset component 436 is provided with two toggle posts 4361, and correspondingly, the telescopic rod 42 is provided with two slide grooves 423. The two slide grooves 423 are respectively located on one side of the two ratchet racks 422 and are arranged along the direction of the ratchet racks 422. In this embodiment, when the telescopic rod 42 is pulled out, the pawl 437 and the ratchet rack of the anti-retraction mechanism are engaged normally, and the telescopic rod 42 can only be pulled out in one direction and cannot be retracted. When it is necessary to readjust the length of the telescopic component 4, the telescopic rod 42 is fully pulled out to its maximum stroke. At this time, one end of the sliding groove 423 on the telescopic rod 42 abuts against the actuating post 4361, causing the reset component 436 to slide in the second mounting groove 4312, so that the boss 4362 on the reset component 436 abuts against the end of the pawl 437 that is not provided with ratchet. Since the middle part of the pawl 437 is rotatably connected to the pin 435, the pawl 437 rotates at this time, causing the pawl 437 to disengage from the ratchet rack 422, and the telescopic rod 42 can then be retracted.

[0055] When the telescopic rod 42 retracts to its minimum stroke, the other end of the sliding groove 423 on the telescopic rod 42 abuts against the actuating column 4361, causing the reset component 436 to slide in the opposite direction, thereby causing the boss 4362 on the reset component 436 to disengage from the pawl 437. Under the torque of the torsion spring 434, the pawl 437 re-engages with the ratchet rack 422, and the anti-retraction mechanism works normally.

[0056] The second rotating mechanism 5 includes a second hinge ear 52 disposed on the telescopic seat 41 and a second hinge base 51 disposed on the top of the support member 2. The second hinge base 51 and the second hinge ear 52 are hinged together by a second hinge shaft 53.

[0057] The second rotating mechanism 5 further includes a rotating limiting mechanism, which includes a limiting block 54. The limiting block 54 is coaxially fixed in the hinge hole of the second hinge ear 52. Specifically, the limiting block 54 is provided with a spline, and the second hinge hole is provided with a spline groove. The spline and the spline groove cooperate to lock the limiting block 54 and the second hinge ear 52 circumferentially. The end of the limiting block 54 extends out of the hinge hole of the second hinge ear 52 and is inserted into the second hinge seat 51. The limiting block 54 and the second hinge seat 51 are rotatably engaged. A limiting boss 541 is provided on the periphery of the limiting block 54. The limiting boss 541 extends into the second hinge seat 51. A limiting groove 511 corresponding to the limiting boss 541 is provided on the second hinge seat 51. The width of the limiting groove 511 is greater than the width of the limiting boss 541, so that the limiting block 54 can rotate relative to the second hinge seat 51 within a set angle.

[0058] Specifically, in this embodiment, the second hinge shaft 53 includes a hinge hole bolt, and the telescopic seat 41 is provided with two second hinge ears 52. One of the second hinge ears 52 is hinged to the second hinge seat 51 through the second hinge shaft 53, and the other second hinge ear 52 is provided with a rotation limiting mechanism in the hinge hole. The limiting block 54 is threadedly connected to the second hinge shaft 53. By providing a rotation limiting mechanism in one of the second hinge ears 52, the relative rotation angle between the telescopic component 4 and the support component 2 is limited to a set range.

[0059] The headrest body 7 is provided with a third hinge seat 61, and the extended end of the telescopic rod 42 is provided with a third hinge ear 62. The third hinge seat 61 and the third hinge ear 62 are hinged together by a third hinge shaft 63.

[0060] The third rotating mechanism 6 further includes a rotating tooth sensing mechanism, which includes an end tooth 65 and a second elastic component 64.

[0061] The end gear 65 is sleeved on the third hinge shaft 63. The end gear 65 is axially slidably disposed within the hinge hole of the third hinge lug 62. The end gear 65 and the third hinge lug 62 are circumferentially locked. Specifically, a spline is provided on the end gear 65, and a spline groove is provided within the hinge hole of the third hinge lug 62. The end gear 65 and the third hinge lug 62 are circumferentially locked and axially slidable through the spline and spline groove. One end face of the end gear 65 is detachably in contact with the third hinge seat 61. A first end tooth 651 is provided on the surface of the end gear 65 that contacts the third hinge seat 61. A second end tooth 611 that mates with the first end tooth 651 is provided on the third hinge seat 61.

[0062] The second elastic member 64 is located in the hinge hole of the third hinge ear 62 and sleeved on the third hinge shaft 63. One end of the second elastic member 64 is limited by the third hinge shaft 63, and the other end abuts against the end tooth 65 so that the first end tooth 651 and the second end tooth 611 mesh.

[0063] In this embodiment, the second elastic component 64 is a spring, located within the hinge hole of the third hinge lug 62 and sleeved on the third hinge shaft 63. The third hinge shaft 63 includes a third hinge shaft body 631 and a sleeve 632 sleeved on the third hinge shaft body 631. The third hinge shaft body 631 includes a hinge hole bolt. The second elastic component 64 is sleeved on the sleeve 632, with one end of the second elastic component 64 abutting and limiting it by the end of the sleeve 632, and the other end abutting against the end tooth 65, causing the first end tooth 651 and the second end tooth 611 to mesh. In this embodiment, the rotary tooth-feel mechanism is used to create a scale feel when adjusting the angle of the headrest body 7 using the third rotary mechanism 6.

[0064] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of this utility model without departing from the scope of the technical solution of this utility model shall fall within the protection scope of this technical solution.

Claims

1. A height-adjustable and rotatable seat headrest, characterized in that, include: Mounting base (1), which is used to connect the seat; Support component (2), the bottom of which is rotatably connected to the mounting base (1) via a first rotating mechanism (3); Telescopic component (4), one end of which is rotatably connected to the top of the support component (2) via a second rotating mechanism (5); The headrest body (7) is rotatably connected to one end of the telescopic component (4) via a third rotating mechanism (6).

2. The height-adjustable and rotatable seat headrest according to claim 1, characterized in that, The first rotating mechanism (3) includes a first hinge seat (31) disposed on the mounting base (1) and a first hinge ear (32) disposed at the bottom of the support member (2). The first hinge seat (31) and the first hinge ear (32) are hinged together by a first hinge shaft (33).

3. A height-adjustable and rotatable seat headrest according to claim 1, characterized in that, The telescopic assembly (4) includes a telescopic seat (41) and a telescopic rod (42); the telescopic seat (41) is rotatably connected to the top of the support component (2) through a second rotating mechanism (5), one end of the telescopic rod (42) is slidably disposed in the telescopic seat (41), and the headrest body (7) is rotatably connected to one end of the telescopic rod (42) through a third rotating mechanism (6).

4. A height-adjustable and rotatable seat headrest according to claim 3, characterized in that, The telescopic assembly (4) further includes a telescopic tooth sensing mechanism, which includes a first elastic component (432) and a toothed block (433); The telescopic seat (41) is provided with a mounting cover (431) that communicates with the inner cavity of the telescopic seat (41). The mounting cover (431) is provided with a first mounting groove (4311). The toothed block (433) is slidably disposed in the first mounting groove (4311). The sliding direction of the toothed block (433) is perpendicular to the telescopic direction of the telescopic rod (42). The first elastic member (432) is disposed at the bottom of the first mounting groove (4311). The first elastic member (432) abuts against the toothed block (433) so that the toothed block (433) abuts against the telescopic rod (42). The telescopic rod (42) is provided with a toothed rack (421) for meshing with the toothed block (433), and the cross section of the toothed rack (421) is wavy.

5. A height-adjustable and rotatable seat headrest according to claim 4, characterized in that, The telescopic assembly (4) further includes an anti-retraction mechanism, which includes a pawl (437), a pin (435), and a torsion spring (434). The pin (435) is disposed inside the mounting cover (431). The middle part of the pawl (437) is rotatably connected to the pin (435). The torsion spring (434) is disposed on the pin (435). One end of the torsion spring (434) abuts against the mounting cover (431), and the other end abuts against the pawl (437) so that the pawl (437) abuts against the telescopic rod (42). The telescopic rod (42) is provided with a ratchet rack (422) that meshes with the pawl (437).

6. A height-adjustable and rotatable seat headrest according to claim 5, characterized in that, The anti-retraction mechanism also includes a reset component (436); The mounting cover (431) is provided with a second mounting groove (4312), and the reset component (436) is slidably disposed in the second mounting groove (4312), and its sliding direction is consistent with the extension and retraction direction of the telescopic rod (42); The reset component (436) is provided with an actuating post (4361), and a sliding groove (423) is provided on the side of the ratchet rack (422) on the telescopic rod (42). The end of the actuating post (4361) is located in the sliding groove (423). The reset component (436) is also provided with a boss (4362) for abutting against the pawl (437). The boss (4362) is used to abut against the pawl (437) to make the pawl (437) rotate along the pin (435) and thus disengage the pawl (437) from the ratchet rack (422).

7. A height-adjustable and rotatable seat headrest according to claim 3, characterized in that, The second rotating mechanism (5) includes a second hinge ear (52) disposed on the telescopic seat (41) and a second hinge seat (51) disposed on the top of the support member (2). The second hinge seat (51) and the second hinge ear (52) are hinged together by a second hinge shaft (53).

8. A height-adjustable and rotatable seat headrest according to claim 7, characterized in that, The second rotating mechanism (5) further includes a rotating limiting mechanism, which includes a limiting block (54). The limiting block (54) is coaxially fixed in the hinge hole of the second hinge ear (52). The end of the limiting block (54) extends out of the hinge hole of the second hinge ear (52) and is inserted into the second hinge seat (51). The limiting block (54) is rotatably connected to the second hinge seat (51). A limiting boss (541) is provided on the periphery of the limiting block (54). The limiting boss (541) extends into the second hinge seat (51). A limiting groove (511) corresponding to the limiting boss (541) is provided on the second hinge seat (51). The width of the limiting groove (511) is greater than the width of the limiting boss (541), so that the limiting block (54) can rotate relative to the second hinge seat (51).

9. A height-adjustable and rotatable seat headrest according to claim 3, characterized in that, The headrest body (7) is provided with a third hinge seat (61), and the extended end of the telescopic rod (42) is provided with a third hinge ear (62). The third hinge seat (61) and the third hinge ear (62) are hinged together by a third hinge shaft (63).

10. A height-adjustable and rotatable seat headrest according to claim 9, characterized in that, The third rotating mechanism (6) further includes a rotating tooth sensing mechanism, which includes an end tooth (65) and a second elastic component (64); The end tooth (65) is sleeved on the third hinge shaft (63), and the end tooth (65) is axially slidably disposed in the hinge hole of the third hinge ear (62). The end tooth (65) is circumferentially locked with the third hinge ear (62). The end face of one end of the end tooth (65) is detachably in contact with the third hinge seat (61) and is provided with a first end tooth (651). The third hinge seat (61) is provided with a second end tooth (611) that cooperates with the first end tooth (651). The second elastic member (64) is located in the hinge hole of the third hinge ear (62) and sleeved on the third hinge shaft (63). One end of the second elastic member (64) is limited by the third hinge shaft (63), and the other end abuts against the end tooth (65) so that the first end tooth (651) and the second end tooth (611) mesh.

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