Adjustable headrest and sofa seat

Abstract

The utility model discloses an adjustable headrest and a sofa seat. The adjustable headrest comprises a headrest plate and a driving mechanism, the driving mechanism comprises a driving plate, the end, close to the headrest plate, of the driving plate is connected with the headrest plate, and the end, away from the headrest plate, of the driving plate is provided with driven gear teeth; the driving rotating shaft is rotationally connected with the driving plate, and the driving plate can rotate around the driving rotating shaft; and an output shaft of the driving motor is provided with a driving gear, and the driving gear is meshed with the driven gear teeth. According to the device, the driving gear is meshed with the driven gear teeth, so that power output by the driving motor can act on the driving plate, the driving plate is driven to rotate around the driving rotating shaft, the driving plate drives the headrest plate to ascend and descend, transmission between the driving motor and the headrest plate through the gear is achieved, and the transmission efficiency is improved; in addition, the lifting adjustment of the headrest plate is smoother, and the noise generated during the lifting adjustment of the headrest plate is effectively reduced.

Description

Technical Field

[0001] This application relates to the field of furniture product technology, and in particular to an adjustable headrest and sofa chair. Background Technology

[0002] As part of smart homes, smart furniture is becoming increasingly popular in daily life, and many smart furniture pieces are equipped with mechanisms for automatic angle adjustment. For example, functional sofas have the function of adjusting posture and changing shape, and can adjust the angle and height of different parts such as legs, backrest, headrest, and lumbar support to adapt to different people and different sitting postures, finding the most comfortable angle for the body and relaxing.

[0003] Sofas with adjustable backrest angles currently available in the technology primarily achieve adjustment in two ways: one is the coordinated adjustment of the backrest and seat cushion, and the other relies on a motor and slide rails to adjust the headrest independently. While the former method can adjust the sofa's posture to some extent, it fails to fully meet users' demands for personalized comfort because it cannot achieve independent headrest adjustment. As for the latter method, which uses a motor and slide rails, although it theoretically provides independent headrest adjustment, it has revealed a series of problems in practical application. Specifically, the transmission mechanism of the motor and slide rails is often inefficient, which not only limits the smoothness of adjustment but also makes the entire adjustment process susceptible to interference from external factors, such as dust accumulation and guide rail wear, leading to jamming during adjustment. Worse still, the noise generated when the motor drives the slide rails is often quite noticeable, which not only disrupts the quiet atmosphere of using the sofa but may also negatively impact the user's relaxation experience. In conclusion, although the motor and slide rail solution has some theoretical appeal, its actual performance falls far short of user expectations. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, this application provides an adjustable headrest that enables gear transmission between the drive motor and the headrest board, effectively improving transmission efficiency and reducing noise when the headrest board is adjusted in height.

[0005] An adjustable headrest according to an embodiment of this application includes: a headrest plate and at least one driving mechanism, wherein the driving mechanism includes: a driving plate, one end of the driving plate near the headrest plate being connected to the headrest plate, and the other end of the driving plate away from the headrest plate being provided with a driven gear; a driving shaft, the driving shaft being rotatably connected to the driving plate, and the driving plate being rotatable around the driving shaft; and a driving motor, the output shaft of the driving motor being provided with a driving gear, the driving gear meshing with the driven gear, for driving the driving plate to rotate around the driving shaft through the driving gear, thereby raising and lowering the headrest plate.

[0006] In this adjustable headrest, the drive gear meshes with the driven gear so that the power output by the drive motor can act on the drive plate, causing the drive plate to rotate around the drive shaft. This allows the drive plate to raise and lower the headrest plate, thereby realizing gear transmission between the drive motor and the headrest plate, effectively improving transmission efficiency and reducing noise when the headrest plate is adjusted.

[0007] According to some embodiments of this application, one end of the drive plate near the headrest plate extends toward the headrest plate to form a support arm, and the support arm is fixedly connected to the headrest plate.

[0008] According to some embodiments of this application, the drive plate is provided with a limiting groove, and a limiting post is movably connected in the limiting groove.

[0009] According to some embodiments of this application, a first fixed bracket is assembled at the bottom of the headrest plate, a first transmission link is hinged to one end of the first fixed bracket near the drive shaft, a first pushing part is provided at one end of the first transmission link near the headrest plate, the first pushing part abuts against the bottom of the first fixed bracket, and the end of the first transmission link near the drive shaft is fixedly connected to the drive plate.

[0010] According to some embodiments of this application, a first elastic element is provided between the end of the first fixed bracket away from the drive shaft and the intermediate bracket.

[0011] According to some embodiments of this application, the bottom of the headrest plate is further equipped with at least one second fixed bracket, the second fixed bracket is connected to a driven mechanism, and the driven mechanism can drive the second fixed bracket to move synchronously with the first fixed bracket.

[0012] According to some embodiments of this application, a backrest frame is also included, wherein the driving mechanism and the driven mechanism are respectively disposed on two opposite sides of the backrest frame.

[0013] According to some embodiments of this application, the driven mechanism includes a second transmission link, a driven shaft, and a spiral spring; the end of the second fixed bracket away from the headrest plate is hinged to the second transmission link, the end of the second transmission link near the headrest plate extends toward the headrest plate to form a second pushing part, the second pushing part abuts against the bottom of the second fixed bracket, and the end of the second transmission link away from the headrest plate is rotatably connected to the driven shaft; the spiral spring acts on the second transmission link to drive the second fixed bracket to move synchronously with the first fixed bracket.

[0014] According to some embodiments of this application, a third elastic element is provided between the end of the second fixed bracket away from the driven rotating shaft and the second transmission link.

[0015] Based on the same inventive concept, this application also proposes a sofa chair, including: an adjustable headrest as described above.

[0016] In summary, the adjustable headrest provided in this application has the following technical effects:

[0017] The drive gear meshes with the driven gear, allowing the power output from the drive motor to act on the drive plate, causing the drive plate to rotate around the drive shaft. This, in turn, causes the drive plate to raise and lower the headrest plate, thus enabling gear transmission between the drive motor and the headrest plate. This effectively improves transmission efficiency and reduces noise during headrest plate adjustment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the adjustable headrest according to an embodiment of this application;

[0019] Figure 2 This is another structural schematic diagram of the adjustable headrest according to an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the drive mechanism according to an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the driven mechanism in an embodiment of this application.

[0022] The meanings of the reference numerals in the attached figures are as follows:

[0023] 1. Headrest plate; 11. First fixed bracket; 12. First transmission link; 13. First pushing part; 14. First elastic element; 15. Second fixed bracket; 2. Drive mechanism; 21. Drive plate; 211. Driven gear tooth; 212. Support arm; 213. Limiting groove; 214. Limiting post; 22. Drive shaft; 23. Drive motor; 231. Drive gear; 3. Backrest frame; 4. Driven mechanism; 41. Second transmission link; 42. Driven shaft; 43. Scroll spring; 44. Third elastic element. Detailed Implementation

[0024] To better understand and implement this application, the technical solutions in this application will be clearly and completely described below with reference to the accompanying drawings.

[0025] In the description of this application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0027] See Figure 2 and Figure 3This application discloses an adjustable headrest. The adjustable headrest includes a headrest plate 1 and at least one drive mechanism 2, wherein the drive mechanism 2 includes a drive plate 21, a drive shaft 22, and a drive motor 23. In some embodiments, the end of the drive plate 21 near the headrest plate 1 is connected to the headrest plate 1, and the end of the drive plate 21 away from the headrest plate 1 is provided with a driven gear 211; the drive shaft 22 is rotatably connected to the drive plate 21, and the drive plate 21 is capable of rotating around the drive shaft 22; the output shaft of the drive motor 23 is provided with a drive gear 231, which meshes with the driven gear 211, for driving the drive plate 21 to rotate around the drive shaft 22 through the drive gear 231, so as to raise and lower the headrest plate 1. Preferably, the drive gear 231 meshes with the driven gear 211 so that the power output by the drive motor 23 can act on the drive plate 21, causing the drive plate 21 to rotate around the drive shaft 22. This allows the drive plate 21 to lift and lower the headrest plate 1, thereby achieving gear transmission between the drive motor 23 and the headrest plate 1, effectively improving transmission efficiency and reducing noise during the lifting and lowering adjustment of the headrest plate 1.

[0028] See Figure 2 and Figure 3 In some embodiments, the drive plate 21 extends from one end near the headrest plate 1 toward the headrest plate 1 to form a support arm 212, and the support arm 212 is fixedly connected to the headrest plate 1. Preferably, the support arm 212 is formed by extending the end of the drive plate 21 near the headrest plate 1 toward the headrest plate 1, so that the drive plate 21 and the headrest plate 1 have sufficient connection length to form a sufficiently stable connection. Optionally, the end of the drive plate 21 away from the headrest plate 1 is provided with an arc-shaped edge, and the driven gear tooth 211 is provided on the arc-shaped edge to improve the meshing degree between the drive gear 231 and the driven gear tooth 211, thereby optimizing the transmission efficiency. Optionally, the drive plate 21 is a sector gear, and the driven gear tooth 211 of the sector gear meshes with the gear tooth of the drive gear 231, and the support arm 212 is provided at the end of the sector gear away from the drive gear 231.

[0029] See Figure 2 and Figure 3In some embodiments, the drive plate 21 is provided with a limiting groove 213, and a limiting post 214 is movably connected within the limiting groove 213. Thus, when the drive motor 23 drives the drive plate 21 to rotate around the drive shaft 22 via the drive gear 231, the limiting groove 213 moves relative to the limiting post 214. This movement utilizes the contact between the two ends of the limiting groove 213 in the direction of movement and the limiting post 214 to achieve limiting, preventing excessive rotation of the drive plate 21 from causing the drive gear 231 to completely separate from the driven gear 211. This effectively ensures multiple transmissions between the drive motor 23 and the headrest plate 1 via gears. Optionally, the limiting groove 213 is arc-shaped so that the limiting groove 213 corresponds to the rotation of the drive plate 21. Optionally, a sliding sleeve is movably fitted on the outer side of the limiting post 214, and the sliding sleeve can rotate along the limiting post 214. In this way, when the limiting groove 213 moves relative to the limiting post 214, it can drive the sliding sleeve to rotate relative to the limiting post 214, so as to change the sliding friction between the limiting groove 213 and the limiting post 214 into rolling friction, effectively reducing the friction between the limiting groove 213 and the limiting post 214, and reducing the wear between the limiting groove 213 and the limiting post 214.

[0030] See Figure 2 and Figure 3In some embodiments, a first fixed bracket 11 is fitted at the bottom of the headrest plate 1. A first transmission link 12 is hinged to one end of the first fixed bracket 11 near the drive shaft 22. The first transmission link 12 extends towards the headrest plate 1 at one end near the headrest plate 1 to form a first pushing part 13. The first pushing part 13 abuts against the bottom of the first fixed bracket 11. The first transmission link 12 is fixedly connected to the drive plate 21 at one end near the drive shaft 22. Thus, when the drive motor 23 drives the headrest plate 1 to rise and fall, the drive motor 23 drives the drive plate 21 to rotate around the drive shaft 22 via the drive gear 231. The drive plate 21 simultaneously drives the first transmission link 12 to rotate upwards. During the upward rotation of the first transmission link 12, the first pushing part 13, which abuts against the bottom of the first fixed bracket 11, pushes the first fixed bracket 11 upwards, causing the first fixed bracket 11 to lift the headrest plate 1. During the downward rotation of the first transmission link 12, the drive motor 23 drives the drive plate 21 to rotate around the drive shaft 22 via the drive gear 231. The drive plate 21 rotates in the opposite direction around the drive shaft 22. Simultaneously, the drive plate 21 drives the first transmission link 12 to rotate downwards. During this downward rotation, the first transmission link 12 pulls the first fixed bracket 11 downwards through its hinge point with the first fixed bracket 11, causing the first fixed bracket 11 to lower the headrest plate 1. This directly converts the power output by the drive motor 23 into the lifting and lowering of the headrest plate 1, improving transmission efficiency and eliminating noise generated when the motor drives the slide rail, effectively reducing noise during headrest plate 1 height adjustment. Furthermore, since the first fixed bracket 11 is hinged to the first transmission link 12 near the drive shaft 22, if a foreign object abuts against the bottom of the headrest plate 1 during its descent, the headrest plate 1 can rotate around the hinge point between the first fixed bracket 11 and the first transmission link 12, preventing the headrest plate 1 from clamping the foreign object. Optionally, the support arm 212 is fixedly connected to one end of the first transmission link 12 near the drive shaft 22, so that the drive plate 21 and the first transmission link 12 have sufficient connection length to form a sufficiently stable connection.

[0031] See Figure 2 and Figure 3In some embodiments, a first elastic element 14 is provided between the end of the first fixed bracket 11 away from the drive shaft 22 and the intermediate bracket. Preferably, the first elastic element 14 drives the first fixed bracket 11 to abut against the first pushing part 13. Thus, when the drive motor 23 drives the headrest board 1 to rise and fall, the headrest board 1 can rise and fall in a straight posture, preventing the end of the headrest board 1 away from the drive shaft 22 from tilting upward or sinking downward. Furthermore, when a foreign object abuts against the bottom of the headrest board 1, the headrest board 1 can rotate around the hinge point between the first fixed bracket 11 and the first transmission link 12, and the first fixed bracket 11 pulls the first elastic element 14 to stretch, preventing the headrest board 1 from clamping the foreign object. When the foreign object is removed, the first elastic element 14 can restore its deformation, driving the first fixed bracket 11 to abut against the first pushing part 13 again, so that the headrest board 1 can continue to descend in a straight posture.

[0032] See Figure 2 , Figure 3 and Figure 4 In some embodiments, at least one second fixed bracket 15 is also fitted to the bottom of the headrest board 1. The second fixed bracket 15 is connected to a driven mechanism 4, and the driven mechanism 4 can drive the second fixed bracket 15 to move synchronously with the first fixed bracket 11. Optionally, the first fixed bracket 11 and the second fixed bracket 15 are arranged laterally; alternatively, the first fixed bracket 11 and the second fixed bracket 15 are respectively disposed at two ends of the headrest board 1 laterally. In this way, when the driving mechanism 2 drives the first fixed bracket 11 to move, the driven mechanism 4 synchronously drives the second fixed bracket 15 to move, so that the two ends of the headrest board 1 can move synchronously, thereby improving the stability and reliability of the headrest board 1.

[0033] See Figure 1 , Figure 2 , Figure 3 and Figure 4In some embodiments, a backrest frame 3 is also included, with the drive mechanism 2 and the driven mechanism 4 respectively disposed on two opposite sides of the backrest frame 3. Optionally, the backrest frame 3 includes at least two side plates, which are disposed opposite to each other. The drive mechanism 2 and the driven mechanism 4 are respectively disposed on the side of the two side plates facing each other. In this way, the drive mechanism 2 and the driven mechanism 4 can be housed within the backrest frame 3, effectively preventing external interference with the movement of the drive mechanism 2 and / or the driven mechanism 4, and also improving the aesthetic appearance of the sofa seat. Optionally, the backrest frame 3 further includes a connecting plate disposed between the two side panels to form a frame structure with the side panels, and the frame structure has an opening on the side closer to the human body. The headrest plate 1 is disposed in the opening and can extend out of or be accommodated in the opening. Optionally, when the driving mechanism 2 and the driven mechanism 4 drive the headrest plate 1 to rise, the headrest plate 1 can extend out of the opening; when the driving mechanism 2 and the driven mechanism 4 drive the headrest plate 1 to fall, the headrest plate 1 can be accommodated in the opening. Optionally, the driving mechanism 2 and the driven mechanism 4 are respectively disposed on two opposite sides within the opening of the backrest frame 3. Optionally, a first assembly frame and a second assembly frame are respectively disposed on two opposite sides within the opening of the backrest frame 3. The driving motor 23, the limiting post 214, and the driving shaft 22 are all fixedly connected to the first assembly frame, and the spiral spring 43 and the driven shaft 42 are all fixedly connected to the second assembly frame.

[0034] See Figure 1 , Figure 2 , Figure 3 and Figure 4In some embodiments, the driven mechanism 4 includes a second transmission link 41, a driven rotating shaft 42, and a spiral spring 43; the end of the second fixed bracket 15 away from the headrest plate 1 is hinged to the second transmission link 41, the end of the second transmission link 41 near the headrest plate 1 extends toward the headrest plate 1 to form a second pushing part, the second pushing part abuts against the bottom of the second fixed bracket 15, and the end of the second transmission link 41 away from the headrest plate 1 is rotatably connected to the driven rotating shaft 42; the spiral spring 43 acts on the second transmission link 41 to drive the second fixed bracket 15 to move synchronously with the first fixed bracket 11 through the second transmission link 41.Optionally, at least one connecting rod can be fixedly connected to the end of the second transmission link 41 away from the headrest plate 1, and the connecting rod is rotatably connected to the driven shaft 42; optionally, the spiral spring 43 can have a certain amount of compression during installation, and the spiral spring 43 abuts against the second transmission link 41 so that the spiral spring 43 provides a reaction force to the second transmission link 41. When the headrest plate 1 is adjusted in height, it can prevent the problem of asynchronous operation between the drive mechanism 2 and the driven mechanism 4, and eliminate the gaps and shaking problems between parts; specifically, when driving the headrest plate 1 to lift, the drive motor 23 drives the drive plate 21 through the drive gear 231. The drive plate 21 rotates around the drive shaft 22, synchronously driving the first transmission link 12 to rotate. During the upward rotation of the first transmission link 12, the first pushing part 13, abutting against the bottom of the first fixed bracket 11, pushes the first fixed bracket 11 upward, causing the first fixed bracket 11 to lift the headrest plate 1. Simultaneously, the spiral spring 43 drives the second transmission link 41 to rotate upward around the driven shaft 42. Optionally, the driven shaft 42 and the drive shaft 22 can be a single unit, or their central axes can be collinear. Alternatively, the driven shaft 42 and the drive shaft 22 can also... These can be two independent components. During the upward rotation of the second transmission link 41, the second pushing part, abutting against the bottom of the second fixed bracket 15, drives the second fixed bracket 15 to lift the headrest plate 1, so that the driving mechanism 2 and the driven mechanism 4 simultaneously lift the headrest plate 1. When driving the headrest plate 1 downward, the driving motor 23 drives the driving plate 21 to rotate in the opposite direction around the driving shaft 22 via the driving gear 231. The driving plate 21 simultaneously drives the first transmission link 12 to rotate downward. During the downward rotation of the first transmission link 12, the first transmission link 12, through its hinge with the first fixed bracket 11... The first fixed bracket 11 is pulled downwards, causing it to drive the headrest plate 1 to descend, so that the headrest plate 1 synchronously drives the second fixed bracket 15 to descend, and drives the second transmission link 41 to rotate downwards around the driven shaft 42, thereby compressing the spiral spring 43. This causes the spiral spring 43 to provide a reaction force to the second transmission link 41, eliminating gaps and wobbling between parts. Furthermore, the second transmission link 41 is provided with a pressing post against which the spiral spring 43 abuts. The spiral spring 43 is preloaded during installation so that it provides a reaction force to the second transmission link 41 through the pressing post.

[0035] See Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments, a third elastic element 44 is provided between the end of the second fixed bracket 15 away from the driven rotating shaft 42 and the second transmission link 41. Preferably, the second fixed bracket 15 is driven by the third elastic element 44 to abut against the second pushing part. Thus, when the drive motor 23 drives the headrest board 1 to rise and fall, the first elastic element 14 drives the first fixed bracket 11 to abut against the first pushing part 13, and the third elastic element 44 drives the second fixed bracket 15 to abut against the second pushing part, so that the headrest board 1 can rise and fall in a straight posture, preventing either end of the headrest board 1 from tilting upward or concave downward. Furthermore, when a foreign object abuts against the bottom of the headrest board 1, the headrest board 1 can pull the first elastic element 14 and the third elastic element 44 to stretch, preventing the headrest board 1 from clamping the foreign object. When the foreign object is removed, the first elastic element 14 and the third elastic element 44 can restore their deformation, so that the headrest board 1 can continue to descend in a straight posture.

[0036] In some embodiments, a sofa seat includes: an adjustable headrest as described above.

[0037] See Figure 1 , Figure 2 , Figure 3 and Figure 4In some embodiments, when the headrest plate 1 is lifted, the drive motor 23 drives the drive plate 21 to rotate around the drive shaft 22 via the drive gear 231. Optionally, the drive motor 23 may include, but is not limited to, a motor. The drive plate 21 synchronously drives the first transmission link 12 to rotate. During the upward rotation of the first transmission link 12, the first elastic member 14 drives the first fixed bracket 11 to abut against the first pushing part 13. The first pushing part 13 pushes the first fixed bracket 11 upward, driving the first fixed bracket 11 to move... The headrest plate 1 is raised, and simultaneously the spiral spring 43 drives the second transmission link 41 to rotate upward around the driven shaft 42. During the upward rotation of the second transmission link 41, the third elastic element 44 drives the second fixed bracket 15 to abut against the second pushing part. The second pushing part drives the second fixed bracket 15 to lift the headrest plate 1, so that the driving mechanism 2 and the driven mechanism 4 lift the headrest plate 1 synchronously. When the headrest plate 1 is driven to descend, the drive motor 23 drives the drive plate 21 to reverse around the drive shaft 22 through the drive gear 231. As the drive plate 21 rotates, it synchronously drives the first transmission link 12 to rotate downwards. During the downward rotation of the first transmission link 12, the first transmission link 12 pulls the first fixed bracket 11 downwards through the hinge point between itself and the first fixed bracket 11, causing the first fixed bracket 11 to drive the headrest board 1 to descend. At the same time, the first elastic member 14 drives the first fixed bracket 11 to abut against the first pushing part 13, and the third elastic member 44 drives the second fixed bracket 15 to abut against the second pushing part, so that the headrest board 1 as a whole can... The headrest plate 1 descends in a straight position. At this time, the headrest plate 1 drives the second fixed bracket 15 to descend synchronously, and drives the second transmission link 41 to rotate downward around the driven shaft 42 to compress the spiral spring 43. This causes the spiral spring 43 to provide a reaction force to the second transmission link 41, eliminating the gaps and shaking problems between the parts. This allows the power output by the drive motor 23 to be directly converted into the lifting and lowering of the headrest plate 1, improving transmission efficiency and eliminating the noise generated when the motor drives the slide rail to slide, effectively reducing the noise when the headrest plate 1 is adjusted in height.

[0038] The technical means disclosed in this application are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. An adjustable headrest, characterized in that, include: A headrest plate (1) and at least one drive mechanism (2), wherein the drive mechanism (2) comprises: A drive plate (21) is provided at one end of the drive plate (21) near the headrest plate (1) and connected to the headrest plate (1). A driven gear tooth (211) is provided at the other end of the drive plate (21) away from the headrest plate (1). A drive shaft (22) is rotatably connected to the drive plate (21), and the drive plate (21) is capable of rotating around the drive shaft (22). A drive motor (23) is provided with a drive gear (231) on its output shaft. The drive gear (231) meshes with the driven gear (211) and is used to drive the drive plate (21) to rotate around the drive shaft (22) so that the headrest plate (1) can be raised or lowered.

2. The adjustable headrest according to claim 1, characterized in that: The drive plate (21) extends from one end near the headrest plate (1) toward the headrest plate (1) to form a support arm (212), and the support arm (212) is fixedly connected to the headrest plate (1).

3. The adjustable headrest according to claim 2, characterized in that: The drive plate (21) is provided with a limiting groove (213), and a limiting post (214) is movably connected in the limiting groove (213).

4. The adjustable headrest according to claim 1, characterized in that: The headrest plate (1) is fitted with a first fixed bracket (11) at its bottom. The first fixed bracket (11) is hinged to a first transmission link (12) at one end near the drive shaft (22). The first transmission link (12) is provided with a first pushing part (13) at one end near the headrest plate (1). The first pushing part (13) abuts against the bottom of the first fixed bracket (11). The first transmission link (12) is fixedly connected to the drive plate (21) at one end near the drive shaft (22).

5. The adjustable headrest according to claim 4, characterized in that: A first elastic element (14) is provided between the end of the first fixed bracket (11) away from the drive shaft (22) and the intermediate bracket.

6. The adjustable headrest according to claim 4, characterized in that: The bottom of the headrest plate (1) is also equipped with at least one second fixed bracket (15), the second fixed bracket (15) is connected to a driven mechanism (4), and the driven mechanism (4) can drive the second fixed bracket (15) to move synchronously with the first fixed bracket (11).

7. The adjustable headrest according to claim 6, characterized in that: It also includes a backrest frame (3), with the drive mechanism (2) and the driven mechanism (4) respectively disposed on two opposite sides of the backrest frame (3).

8. The adjustable headrest according to claim 7, characterized in that: The driven mechanism (4) includes a second transmission link (41), a driven rotating shaft (42), and a spiral spring (43); The end of the second fixed bracket (15) away from the headrest plate (1) is hinged to the second transmission link (41). The end of the second transmission link (41) near the headrest plate (1) extends toward the headrest plate (1) to form a second pushing part. The second pushing part abuts against the bottom of the second fixed bracket (15). The end of the second transmission link (41) away from the headrest plate (1) is rotatably connected to the driven rotating shaft (42). The spiral spring (43) acts on the second transmission link (41) to drive the second fixed bracket (15) to move synchronously with the first fixed bracket (11) through the second transmission link (41).

9. The adjustable headrest according to claim 8, characterized in that: A third elastic element (44) is provided between the end of the second fixed bracket (15) away from the driven rotating shaft (42) and the second transmission link (41).

10. A sofa chair, characterized in that, include: The adjustable headrest as described in any one of claims 1-9.

Images