Headrest assembly of seat and seat

Abstract

The utility model discloses a headrest assembly of a seat and the seat. The headrest assembly of the seat comprises a fixed seat, a movable seat, a connecting seat, a headrest and a driving mechanism, a sliding groove is formed in the fixed seat, the movable seat is slidably mounted in the sliding groove, a mounting wall is formed on the rear end face of the sliding groove, and a mounting cavity is formed in the fixed seat and located on the rear side of the mounting wall; the driving mechanism comprises a motor, a speed reducer, a screw and a nut, the motor and the speed reducer are both located in the mounting cavity, and a supporting piece supported on the rear side of a shell of the speed reducer is arranged in the fixing base; the connecting seat is pivoted to the front end of the movable seat through a rotating shaft extending transversely, and a locking mechanism is arranged between the connecting seat and the movable seat; the headrest is installed on the connecting base and can slide relative to the connecting base in the vertical direction, an elastic element is arranged between the headrest and the connecting base, and the elastic element is used for applying upward elastic stress to the headrest. The multi-degree-of-freedom adjustment of the headrest is realized, and stable support can be provided for the headrest.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a headrest assembly and a seat. Background Technology

[0002] To prevent fatigue caused by the user's head and neck being unsupported, some existing office chairs and gaming chairs are usually equipped with headrest components to support the user's head and neck. However, existing headrest components typically only allow for adjustment in one direction, making it difficult to adapt to different sitting postures. While some chair headrest components offer multi-degree-of-freedom adjustment, the limited space in the headrest area results in limited dimensions for each component, leading to limited strength in their interlocking forces. This makes it difficult to provide stable support for the user's head and neck, thus affecting the chair's comfort. Utility Model Content

[0003] The purpose of this invention is to provide a headrest assembly and a seat that can be adjusted with multiple degrees of freedom and provide stable support.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The headrest assembly of the seat includes a fixed seat, a movable seat, a connecting seat, a headrest, and a drive mechanism;

[0006] The fixed base is provided with a slide groove extending from its front end to the rear. The movable base is slidably installed in the slide groove. The rear end face of the slide groove forms a mounting wall. The interior of the fixed base is located behind the mounting wall to form a mounting chamber. The drive mechanism includes a motor, a reducer, a screw, and a nut. The motor and the reducer are both located in the mounting chamber. The front side of the reducer housing is abutted against the rear side of the mounting wall. The motor is located below the reducer and its output shaft is connected to the input end of the reducer. The screw is connected to the output end of the reducer and extends forward through the mounting wall. The nut is sleeved on the screw and is fixedly engaged with the movable base. The fixed base is provided with a support member supporting the rear side of the reducer housing.

[0007] The connecting seat is pivotally connected to the front end of the movable seat via a laterally extending pivot, and a locking mechanism is provided between the connecting seat and the movable seat;

[0008] The headrest is mounted on the connecting seat and can slide relative to the connecting seat in the vertical direction. An elastic element is provided between the headrest and the connecting seat, which is used to apply upward elastic stress to the headrest.

[0009] Preferably, the fixing base includes an upper fixing base, a lower fixing base, and a rear cover. The upper fixing base and the lower fixing base are detachably fixed together and together form a sliding groove. The rear cover is detachably fixed to the rear side of the upper fixing base and the lower fixing base and together with the upper fixing base and the lower fixing base form an installation chamber.

[0010] Preferably, the support member is a support rib that protrudes forward from the front side of the rear cover; multiple front positioning ribs are provided on the lower fixed seat, multiple rear positioning ribs are provided on the front side of the rear cover, and the motor housing is clamped between the front positioning ribs and the rear positioning ribs.

[0011] Preferably, the mounting wall includes an upper mounting wall integrally formed with the upper fixed seat and a lower mounting wall integrally formed with the lower fixed seat. The upper mounting wall and the lower mounting wall are connected and a through hole for the screw to pass through is formed between them. The upper mounting wall is provided with an upper groove with the opening facing downward and the lower mounting wall is provided with a lower groove with the opening facing upward. Two protrusions are provided on the front side of the reducer housing, which are respectively embedded in the upper groove and the lower groove.

[0012] Preferably, the movable seat includes two connecting ears facing each other, and a rotating part is provided on the connecting seat and embedded between the two connecting ears. The rotating part is provided with a shaft hole extending from one side to the other side. The rotating shaft passes through the shaft hole and its two ends protrude from the shaft hole respectively. The locking mechanism includes a positioning block fixedly engaged with the rotating part and sleeved on the rotating shaft, a pressure block that can move relative to the connecting ears along the axial direction of the rotating shaft and sleeved on the rotating shaft, and an elastic pressing member. Multiple protruding teeth are provided on the surfaces of the positioning block and the pressure block that are in contact with each other. The protruding teeth of the positioning block and the protruding teeth of the pressure block mesh with each other. The elastic pressing member is placed between the pressure block and the end of the rotating shaft to apply an inward elastic stress to the pressure block.

[0013] Preferably, the connecting ear is provided with a mounting hole, and the inner wall of the mounting hole is provided with a guide groove whose extension direction is consistent with the axis of the rotating shaft. The outer periphery of the pressure block is provided with a flange that slides and is embedded in the guide groove. The rotating shaft is a locking screw, and the inner ends of the two rods of the locking screw are inserted into the shaft hole of the rotating part and screwed together. The elastic clamping element is an elastic rubber sleeve sleeved on the outside of the locking screw, with the inner end face of the elastic rubber sleeve abutting against the pressure block and the outer end face abutting against the nut of the locking screw.

[0014] Preferably, the headrest includes a back panel with two guide grooves extending in the vertical direction. The connecting seat has two slides respectively embedded in the two guide grooves. The front end face of the slides is fixed with a stop in a detachable manner. The back panel is confined between the connecting seat and the stop.

[0015] Preferably, the back plate is provided with a hanging post located below the slide table, and the elastic element is a tension spring, with the upper and lower ends of the tension spring being hung on the slide table and the hanging post, respectively.

[0016] Preferably, the headrest also includes a flexible shielding part located on the front side of the back panel, the flexible shielding part and the back panel forming a receiving cavity, and a massage mechanism is disposed in the receiving cavity; a cable sheath is connected between the connecting seat and the fixing seat, and the cable of the massage mechanism passes through the pre-set cable hole on the back panel and the cable sheath and extends into the mounting cavity.

[0017] Seats, including the headrest assembly of the aforementioned seats.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention adjusts the headrest's position by driving a movable seat to move back and forth via a drive mechanism. The headrest's swing angle is adjusted by a connecting seat pivotally connected to the movable seat and engaging a locking mechanism. An elastic element between the headrest and the connecting seat allows for adaptive adjustment of the headrest's vertical position, thus enabling multi-degree-of-freedom adjustment to accommodate different sitting postures and body types. Furthermore, because the reducer of the drive mechanism is clamped by the mounting wall and support components on the fixed seat, the backward pressure exerted by the nut on the screw when the user's head presses backward against the headrest is transmitted to the fixed seat, providing stable support for the headrest. Additionally, arranging the motor and reducer vertically reduces the size of the fixed seat in the front-to-back direction, minimizing the space occupied by the headrest assembly and facilitating its spatial layout on the seat. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a cross-sectional view of the present invention;

[0023] Figure 4 for Figure 3 BB section view;

[0024] Figure 5 for Figure 1 A schematic diagram of the structure of the fixed base.

[0025] Among them: 10, fixed seat; 11, upper fixed seat; 111, upper mounting wall; 112, upper groove; 12, lower fixed seat; 121, lower mounting wall; 122, lower groove; 123, front positioning rib; 13, rear cover; 131, support rib; 132, rear positioning rib; 20, movable seat; 21, connecting ear; 211, mounting hole; 212, guide groove; 22, pressure block; 221, flange; 23, elasticity. Clamping component; 30. Connecting seat; 31. Slide table; 311. Stop block; 32. Rotating part; 321. Shaft hole; 33. Positioning block; 40. Headrest; 41. Back plate; 411. Guide groove; 412. Cable hole; 42. Hanging post; 43. Tension spring; 51. Motor; 52. Reducer; 521. Protrusion; 53. Screw; 54. Nut; 61. Screw rod; 62. Screw rod; 70. Cable sheath. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] like Figure 1 , 2As shown in Figures 3, 4, and 5, a headrest assembly for a seat according to this utility model is provided. It includes a fixed seat 10, a movable seat 20, a connecting seat 30, a headrest 40, and a drive mechanism. The fixed seat 10 can be mounted on the backrest support of the seat. The fixed seat 10 is provided with a sliding groove extending from its front end to the rear. The movable seat 20 is slidably embedded in the sliding groove, so that the movable seat 20 can move relative to the fixed seat 10 in the front-rear direction. The rear end face of the sliding groove forms a mounting wall. The fixed seat 10 has a hollow structure, and a mounting chamber is formed inside it located behind the mounting wall. The drive mechanism includes a motor 51, a reducer 52, a screw 53, and a nut 54, wherein the motor 51 and the reducer 52 are disposed in the mounting chamber.

[0030] Specifically, the housing of the reducer 52 is located above the housing of the motor 51. The front side of the housing of the reducer 52 is abutted against the rear side of the mounting wall. The fixed base 10 is provided with a support member supporting the rear side of the housing of the reducer 52. The housing of the motor 51 is fixed together with the housing of the reducer 52, so that the motor 51 is located below the reducer 52. The output shaft of the motor 51 is connected to the input end of the reducer 52. The screw 53 extends in the front-back direction, and its rear end is connected to the output end of the reducer 52. The screw 53 extends forward from the reducer 52 and passes through a pre-set through hole on the mounting wall. The nut 54 is sleeved on the screw 53 and fixedly connected to the movable base 20. When the motor 51 is started, it drives the screw 53 to rotate. The screw threads of the screw 53 and the nut 54 cooperate with each other, thus pushing the movable base 20 to move back and forth inside the slide groove.

[0031] The connecting seat 30 is pivotally connected to the front end of the movable seat 20 via a laterally extending pivot. A locking mechanism is provided between the connecting seat 30 and the movable seat 20, which can lock the connecting seat 30 and the movable seat 20 to keep them relatively fixed. Thus, the connecting seat 30 can be swung up and down as needed. After adjusting the connecting seat 30 to an appropriate swing angle, the locking mechanism fixes the connecting seat 30 to the movable seat 20, so that the support angle of the headrest 40 installed on the connecting seat 30 can provide better support for the user's head and neck. The headrest 40 is mounted on the connecting seat 30 and can slide relative to the connecting seat 30 in the vertical direction. An elastic element is provided between the headrest 40 and the connecting seat 30. The elastic element always applies an upward elastic stress to the headrest 40. When the user's head applies downward pressure to the headrest 40, the headrest 40 moves down to compress the elastic element, increasing the elastic stress of the elastic element. When the elastic stress of the elastic element and the downward pressure of the user's head tend to be balanced, the headrest 40 adaptively moves to the optimal support position in the vertical direction.

[0032] In this invention, the headrest 40's front-to-back position is adjusted by driving the movable seat 20 to move back and forth via a drive mechanism. The headrest 40's swing angle is adjusted by pivoting the connecting seat 30 to the movable seat 20 and engaging a locking mechanism. The headrest 40's vertical position is adaptively adjusted via an elastic element between the headrest 40 and the connecting seat 30, thus achieving multi-degree-of-freedom adjustment and allowing the headrest 40 to accommodate different sitting postures and body types. Furthermore, since the reducer 52 of the drive mechanism is clamped by the mounting wall and support members on the fixed seat 10, the backward pressure applied by the nut 54 to the screw 53 when the user's head presses backward against the headrest 40 can be transmitted to the fixed seat 10, providing stable support for the headrest 40. Additionally, arranging the motor 51 and reducer 52 vertically reduces the front-to-back dimensions of the fixed seat 10, decreasing the space occupied by the headrest assembly and facilitating its spatial layout on the seat.

[0033] In a preferred embodiment, the fixing base 10 adopts a split and assemblable structure. Specifically, the fixing base 10 includes an upper fixing base 11, a lower fixing base 12, and a rear cover 13. The upper fixing base 11 and the lower fixing base 12 are fixed together by bolts or other detachable connections, forming a sliding groove. The rear cover 13 is fixed to the rear side of the upper fixing base 11 and the lower fixing base 12 by bolts or other detachable fixing methods, forming an installation chamber together with the upper fixing base 11 and the lower fixing base 12. The aforementioned support member is a support rib 131 protruding forward from the front side of the rear cover 13. The lower fixed seat 12 is provided with multiple front positioning ribs 123, and the front side of the rear cover 13 is provided with multiple rear positioning ribs 132. The housing of the motor 51 is clamped between the front positioning ribs 123 and the rear positioning ribs 132. During assembly, the movable seat 20 can be placed between the upper fixed seat 11 and the lower fixed seat 12, and the upper fixed seat 11 and the lower fixed seat 12 can be fixed together with bolts. Then, the drive mechanism is installed from the rear side of the upper fixed seat 11 and the lower fixed seat 12. Finally, the rear cover 13 is placed on the rear side of the drive mechanism. The support ribs 131 on the rear cover 13 press the reducer 52 forward, so that the front side of the reducer 52 is close to the mounting wall. At the same time, the front positioning ribs 123 and the rear positioning ribs 132 clamp the motor 51. Clamping the motor 51 can prevent the motor 51 from vibrating and colliding with the lower fixed seat 12 and the rear cover 13 during operation, thus avoiding noise.

[0034] An upper mounting wall 111 extending downwards is provided on the upper fixed seat 11, and the upper mounting wall 111 is integrally formed with the upper fixed seat 11. Correspondingly, a lower mounting wall 121 extending upwards is provided on the lower fixed seat 12, and the lower mounting wall 121 is integrally formed with the lower fixed seat 12. After the upper fixed seat 11 and the lower fixed seat 12 are fixed together, the upper mounting wall 111 and the lower mounting wall 121 are joined together to form a mounting wall, and a through hole for the screw 53 to pass through is formed between the upper mounting wall 111 and the lower mounting wall 121. An opening facing the rear side of the upper mounting wall 111 is provided. The lower mounting wall 121 has an upper groove 112 and an upper groove 122 with an upward opening on its rear side. The front side of the reducer 52 housing has two protrusions 521, which are respectively embedded in the upper groove 112 and the lower groove 122. The upper groove 112, the lower groove 122 and the two protrusions 521 are used to position the reducer 52 and the fixed seat 10, thereby improving the installation accuracy of the reducer 52 and the fixed seat 10. This results in the screw 53 and the nut 54 having higher assembly accuracy, so as to minimize the energy consumption of the motor 51.

[0035] The movable seat 20 includes two connecting ears 21 facing each other. A rotating part 32 is provided on the connecting seat 30, embedded between the two connecting ears 21. The rotating part 32 has a shaft hole 321 extending from one side to the other. A rotating shaft passes through the shaft hole 321, with both ends protruding from the sides of the rotating part 32, allowing the two ends of the rotating shaft to engage with the two connecting ears 21 respectively. The locking mechanism includes a positioning block 33, a pressure block 22, and an elastic clamping member 23. The positioning block 33 is fixedly engaged with the rotating part 32 and sleeved on the rotating shaft. The pressure block 22 is installed on the connecting ears 21, allowing it to move axially relative to the connecting ears 21 on the rotating shaft. Multiple protruding teeth are provided on the surfaces where the positioning block 33 and the pressure block 22 meet. The teeth on the pressure block 22 and the convex teeth on the pressure block 22 mesh together. The elastic clamping member 23 is set between the end of the pressure block 22 and the rotating shaft. The elastic clamping member 23 applies an inward elastic stress to the pressure block 22, so that the convex teeth on the pressure block 22 mesh with the convex teeth on the positioning block 33. When there is no external force, the pressure block 22 is squeezed by the elastic clamping member 23 and will not move along the axial direction of the rotating shaft, thereby locking the movable seat 20 and the connecting seat 30 and preventing them from rotating relative to each other. When the connecting seat 30 is rotated by an external force, the convex teeth on the positioning block 33 squeeze the convex teeth on the pressure block 22, so that the pressure block 22 moves outward relative to the connecting ear 21. The elastic clamping member 23 contracts, so that the positioning block 33 rotates relative to the pressure block 22. After the connecting seat 30 swings to the required angle, the external force on the connecting seat 30 is removed, and the adjustment of the up and down swing angle of the headrest 40 is finally completed.

[0036] The connecting ear 21 is provided with a mounting hole 211, which extends from its outer side to its inner side. A guide groove 212 is provided on the inner wall of the mounting hole 211, and the extension direction of the guide groove 212 is consistent with the axial direction of the rotating shaft. A flange 221 is provided on the outer periphery of the pressure block 22, and the flange 221 is slidably embedded inside the guide groove 212, allowing the pressure block 22 to slide along the guide groove 212 while preventing the pressure block 22 from rotating relative to the connecting ear 21. For ease of installation, the rotating shaft is equipped with a pair of locking screws. The device includes screw rods 61 and 62. The inner ends of screw rods 61 and 62 are inserted into the shaft hole 321 of the rotating part 32 and screwed together inside the shaft hole 321. The nuts of screw rods 61 and 62 form the two ends of the rotating shaft. A locking mechanism is provided between each of the two connecting lugs 21 and the rotating part 32. The nuts of screw rods 61 and 62 are respectively pressed against the outer sides of the two elastic clamping members 23, which respectively press the pressure blocks 22 of the two locking mechanisms onto the positioning block 33. The elastic clamping member 23 is an elastic rubber sleeve sleeved on the outside of the locking screw. The inner end face of the elastic rubber sleeve abuts against the pressure block 22, and the outer end face abuts against the nut of the locking screw. During assembly, the pressure block 22 and the elastic clamping member 23 are inserted into the mounting holes 211 of the connecting ears 21. Screws 61 and 62 are then inserted from the outside of the two connecting ears 21, and finally, screws 61 and 62 are tightened to press the two elastic clamping members 23 together. It should be noted that in other embodiments, the elastic clamping member 23 can also be a spring, sheet metal, or other elastic component.

[0037] The headrest 40 includes a back panel 41 with two guide grooves 411 extending vertically. The connecting seat 30 has two slides 31 respectively embedded within the guide grooves 411. When the headrest 40 moves up and down, the slides 31 slide within the guide grooves 411, thus slidably mounting the back panel 41 onto the connecting seat 30. A stop block 311 is provided on the front end face of the slide block 31, and the stop block 311 is fixed to the slide block 31 by bolts or other detachable means. The back panel 41 is confined between the connecting seat 30 and the stop block 311. During assembly, the slide block 31 is inserted into the guide groove 411 from the rear side, and the stop block 311 is fixed to the slide block 31 on the front side of the back panel 41. A hanging post 42 is provided on the back panel 41 below the slide block 31. The elastic element is a tension spring 43, with its upper and lower ends respectively hooked onto the slide block 31 and the hanging post 42. When the headrest 40 is pressed downwards by the user's head, the headrest 40 moves downwards, and the tension spring 43 is stretched, thereby increasing the upward elastic stress of the tension spring 43 on the headrest 40. When the elastic stress of the tension spring 43 on the headrest 40 and the downward pressing force on the headrest 40 tend to balance, the headrest 40 adaptively moves to the appropriate position. The tension spring 43 can be replaced by other elastic elements such as springs, sheet springs, or elastic rubber blocks.

[0038] The headrest 40 also includes a flexible shield located in front of the backrest 41. The flexible shield can be made of leather, fabric, or molded cotton, etc. It forms a cavity with the backrest 41. A massage mechanism is installed inside the cavity. The massage mechanism presses against the flexible shield to provide massage to the user's head and neck. A cable sheath 70 is installed between the connecting seat 30 and the fixed seat 10. The cable of the massage mechanism passes through the pre-set cable hole 412 on the backrest 41 and the cable sheath 70 and extends into the mounting chamber of the fixed seat 10. The main control circuit board can be installed inside the mounting chamber. The cable of the massage mechanism is connected to the main control circuit board. The cable sheath 70 protects the cable and prevents the cable from interfering with the connecting seat 30 and the movable seat 20.

[0039] The seat of this utility model includes the headrest assembly of the aforementioned seat. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0040] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A headrest assembly for a seat, characterized in that, Includes a fixed base, a movable base, a connecting base, a headrest, and a drive mechanism; The fixed base is provided with a slide groove extending from its front end to the rear. The movable base is slidably installed in the slide groove. The rear end face of the slide groove forms a mounting wall. The interior of the fixed base is located behind the mounting wall to form a mounting chamber. The drive mechanism includes a motor, a reducer, a screw, and a nut. The motor and the reducer are both located in the mounting chamber. The front side of the reducer housing is abutted against the rear side of the mounting wall. The motor is located below the reducer and its output shaft is connected to the input end of the reducer. The screw is connected to the output end of the reducer and extends forward through the mounting wall. The nut is sleeved on the screw and is fixedly engaged with the movable base. The fixed base is provided with a support member supporting the rear side of the reducer housing. The connecting seat is pivotally connected to the front end of the movable seat via a laterally extending pivot, and a locking mechanism is provided between the connecting seat and the movable seat; The headrest is mounted on the connecting seat and can slide relative to the connecting seat in the vertical direction. An elastic element is provided between the headrest and the connecting seat, which is used to apply upward elastic stress to the headrest.

2. The headrest assembly of the seat as claimed in claim 1, characterized in that, The mounting base includes an upper mounting base, a lower mounting base, and a rear cover. The upper and lower mounting bases are detachably fixed together and together form a sliding groove. The rear cover is detachably fixed to the rear side of the upper and lower mounting bases and together with the upper and lower mounting bases form an installation chamber.

3. The headrest assembly of the seat as described in claim 2, characterized in that, The support member is a support rib that protrudes forward from the front side of the rear cover; multiple front positioning ribs are provided on the lower fixed seat, and multiple rear positioning ribs are provided on the front side of the rear cover. The motor housing is clamped between the front positioning ribs and the rear positioning ribs.

4. The headrest assembly of the seat as claimed in claim 2, characterized in that, The mounting wall includes an upper mounting wall integrally formed with the upper fixed seat and a lower mounting wall integrally formed with the lower fixed seat. The upper mounting wall and the lower mounting wall are connected and a through hole for the screw to pass through is formed between them. The upper mounting wall is provided with an upper groove with the opening facing downward and the lower mounting wall is provided with a lower groove with the opening facing upward. Two protrusions are provided on the front side of the reducer housing, which are respectively embedded in the upper groove and the lower groove.

5. The headrest assembly of the seat as claimed in claim 1, characterized in that, The movable seat includes two connecting ears facing left and right. The connecting seat is provided with a rotating part embedded between the two connecting ears. The rotating part is provided with a shaft hole extending from one side to the other side. The rotating shaft passes through the shaft hole and its two ends protrude from the shaft hole respectively. The locking mechanism includes a positioning block fixedly engaged with the rotating part and sleeved on the rotating shaft, a pressure block that can move relative to the connecting ears along the axial direction of the rotating shaft and sleeved on the rotating shaft, and an elastic pressing member. The surfaces of the positioning block and the pressure block that are in contact with each other are provided with multiple protruding teeth. The protruding teeth of the positioning block and the protruding teeth of the pressure block mesh with each other. The elastic pressing member is placed between the pressure block and the end of the rotating shaft to apply an inward elastic stress to the pressure block.

6. The headrest assembly of the seat as claimed in claim 5, characterized in that, The connecting ear is provided with a mounting hole, and the inner wall of the mounting hole is provided with a guide groove whose extension direction is consistent with the axis of the rotating shaft. The outer periphery of the pressure block is provided with a flange that slides and is embedded in the guide groove. The rotating shaft is a locking screw, and the inner ends of the two rods of the locking screw are inserted into the shaft hole of the rotating part and screwed together. The elastic clamping element is an elastic rubber sleeve sleeved on the outside of the locking screw. The inner end face of the elastic rubber sleeve abuts against the pressure block, and the outer end face abuts against the nut of the locking screw.

7. The headrest assembly of the seat as claimed in claim 1, characterized in that, The headrest includes a back panel with two guide grooves extending vertically. The connecting seat has two slides respectively embedded in the two guide grooves. The front end face of the slides is fixed with a stop in a detachable manner. The back panel is confined between the connecting seat and the stop.

8. The headrest assembly of the seat as claimed in claim 7, characterized in that, The back plate is equipped with a hanging post located below the slide. The elastic element is a tension spring, and the upper and lower ends of the tension spring are respectively attached to the slide and the hanging post.

9. The headrest assembly of the seat as claimed in claim 7, characterized in that, The headrest also includes a flexible shielding part located on the front side of the back panel. The flexible shielding part and the back panel form a receiving cavity, in which a massage mechanism is installed. A cable sheath is connected between the connecting seat and the fixing seat. The cable of the massage mechanism passes through the pre-set cable hole on the back panel and the cable sheath before extending into the mounting cavity.

10. A seat, characterized in that, Includes the headrest assembly of the seat as described in any one of claims 1-9.

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