A multi-level adjustable headrest structure

Abstract

This utility model discloses a multi-level adjustable headrest structure, including a headrest body, a headrest connector mounted on the back of the headrest body, a seat connector, and a first-stage rotating arm. The seat connector is installed on a preset seat body. Both ends of the first-stage rotating arm are rotatably connected to the headrest connector and the seat connector respectively through preset locking components. Each locking component includes a movable shaft, an elastic element, and a top-pressing handle rotatably connected to one end of the movable shaft. The movable shaft is used for the connection between one end of the first-stage rotating arm and the rotating end of the headrest connector, or the connection between the other end of the first-stage rotating arm and the rotating end of the seat connector, to be fitted on the same shaft. A top-pressing block is installed on the other end of the movable shaft to lock and stop the connection at the above-mentioned connection points in conjunction with the top-pressing handle. The two pins of the elastic element are respectively connected to one end of the first-stage rotating arm and the rotating end of the headrest connector, or the rotating end of the first-stage rotating arm and the rotating end of the seat connector.

Description

Technical Field

[0001] This utility model relates to the technical field of seat headrests, and in particular to a multi-level adjustable headrest structure. Background Technology

[0002] In traditional chairs, the headrest is usually installed on the seat in a one-piece or fixed manner. Some headrests may be installed on the seat by a rotating connection. The above installation methods have the disadvantage of small swing range and cannot well adapt to user needs.

[0003] Therefore, based on the above-mentioned technical problems, this application proposes a headrest structure with a large adjustment range, high adaptability, and multi-level adjustment that can switch between locking and unlocking. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a headrest structure with a large adjustment range, high adaptability, and multi-level adjustment that can be switched between locking and unlocking.

[0005] To achieve the above objectives, this utility model provides a multi-level adjustable headrest structure, including a headrest body, a headrest connector mounted on the back of the headrest body, a seat connector, and a primary rotating arm. The seat connector is mounted on a pre-set seat body. Both ends of the primary rotating arm are rotatably connected to the rotating ends of the headrest connector and the seat connector, respectively, via pre-set locking components. Each locking component includes a movable shaft, an elastic element sleeved on the outer circumference of the movable shaft, and a pressure handle rotatably connected to one end of the movable shaft. The movable shaft is used for the connection between one end of the primary rotating arm and the rotating end of the headrest connector, or the connection between the other end of the primary rotating arm and the rotating end of the seat connector, to be fitted together on the same shaft. The other end of the movable shaft is equipped with a pressure handle that engages with the aforementioned connectors. A top-pressing block is used to lock and stop the movement at the joint. The two pins of the elastic element are respectively connected to one end of the primary rotating arm and the rotating end of the headrest connector or the other end of the primary rotating arm and the rotating end of the seat connector. By rotating the top-pressing handle in the forward direction, the top-pressing end of the top-pressing handle pushes the end of the primary rotating arm, so that the primary rotating arm overcomes the elastic reaction force of the elastic element, and locks the joint between one end of the primary rotating arm and the rotating end of the headrest connector or the other end of the primary rotating arm and the rotating end of the seat connector. By rotating the top-pressing handle in the reverse direction, the end of the primary rotating arm is released from the joint between one end of the primary rotating arm and the rotating end of the headrest connector or the other end of the primary rotating arm and the rotating end of the seat connector under the elastic force of the elastic element.

[0006] Furthermore, a through rotating hole is provided on one end of the movable shaft, and a connecting hole is provided on the top pressing handle that is eccentrically arranged and aligned with the connecting hole.

[0007] Furthermore, each end of the first-stage rotating arm is provided with a first-stage hinge hole, the rotating end of the headrest connector is provided with a second-stage hinge hole that is hinged to one of the first-stage hinge holes, and the rotating end of the seat connector is provided with a third-stage hinge hole that is hinged to the other first-stage hinge hole.

[0008] Furthermore, a primary connecting boss is formed in the primary hinge holes at both ends of the primary rotating arm. The primary connecting boss is used to connect to one end of a certain elastic element. A secondary connecting boss is formed in the secondary hinge hole on the rotating end of the headrest connector. The secondary connecting boss is used to connect to the other end of a certain elastic element. A tertiary connecting boss is formed in the tertiary hinge hole on the rotating end of the seat connector. The tertiary connecting boss is used to connect to the other end of another elastic element.

[0009] Furthermore, a primary engagement portion is provided at both ends of the primary rotating arm, and a secondary engagement portion is provided at the rotating end of the headrest connector and the rotating end of the seat connector to engage and disengage with the primary engagement portion.

[0010] Furthermore, the primary rotating arm includes a primary fixed seat and a primary rotating seat. The primary rotating seat is mounted on the primary fixed seat, and multiple annularly arranged primary stop teeth are protruding from both ends of one side of the primary rotating seat. The headrest connector includes a secondary fixed seat and a primary stop seat. The primary stop seat is mounted on the secondary fixed seat, and multiple annularly arranged secondary stop teeth are protruding from one end of the primary stop seat. The multiple secondary stop teeth on the primary stop seat can be separably engaged with the multiple primary stop teeth on one end of the primary rotating seat. The seat connector includes a tertiary fixed seat and a secondary stop seat. The secondary stop seat is mounted on the tertiary fixed seat, and multiple annularly arranged tertiary stop teeth are protruding from one end of the secondary stop seat. The multiple tertiary stop teeth on the secondary stop seat can be separably engaged with the multiple primary stop teeth on the other end of the primary rotating seat.

[0011] Furthermore, the primary rotating arm and the seat connector are rotatably connected by a pre-set secondary rotating arm, wherein one end of the secondary rotating arm and one end of the primary rotating arm, as well as one end of the secondary rotating arm and the rotating end of the seat connector, are arranged on the same axis through a locking assembly.

[0012] Furthermore, four-stage hinge holes are provided on both ends of the secondary rotating arm. The primary hinge hole on one end of the primary rotating arm is hinged to the four-stage hinge hole on one end of the secondary rotating arm. The tertiary hinge hole on the rotating end of the seat connector is hinged to the four-stage hinge hole on the other end of the secondary rotating arm.

[0013] Furthermore, each of the four-stage hinge holes at both ends of the secondary rotating arm is formed with a four-stage connecting boss, which is used to connect to one end of a certain elastic element.

[0014] Furthermore, the secondary rotating arm includes a fourth-stage fixed seat and a secondary rotating seat. The secondary rotating seat is mounted on the fourth-stage fixed seat. Multiple annularly arranged fourth-stage stop teeth protrude from both ends of one side of the secondary rotating seat. The multiple fourth-stage stop teeth on both ends of the secondary rotating seat can be separably engaged with multiple first-stage stop teeth on one end of the first-stage rotating seat and multiple third-stage stop teeth on the secondary stop seat.

[0015] The present invention adopts the above-mentioned solution, and its beneficial effects are as follows: Through the rotational connection between the headrest connector, the seat connector, and the first-stage rotating arm, the headrest body can be rotated and adjusted within a large range (in two stages), and the vertical height of the headrest body can be adjusted by rotational adjustment, thereby increasing the adjustment range of the headrest body and improving its adaptability; secondly, by setting a locking component at the connection of the headrest connector, the seat connector, and the first-stage rotating arm, the connection can be switched between locking and releasing, ensuring the tightness of the connection when switched to the locked state and the rotational flexibility when switched to the released state, thereby improving the user experience. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the headrest in this embodiment.

[0017] Figure 2 This is a schematic diagram of the back of the headrest in this embodiment.

[0018] Figure 3 for Figure 2 A cross-sectional view of point AA in the diagram.

[0019] Figure 4 This is an exploded schematic diagram of the headrest in this embodiment.

[0020] Figure 5 This is a schematic diagram of the headrest rotation adjustment in this embodiment.

[0021] Figure 6 This is a schematic diagram of the headrest rotation adjustment in this embodiment.

[0022] Figure 7This is a schematic diagram of the headrest connector in this embodiment.

[0023] Figure 8 This is a schematic diagram of the secondary fixing base in Embodiment 1.

[0024] Figure 9 This is a schematic diagram of the first-stage stop seat in this embodiment.

[0025] Figure 10 This is a schematic diagram of the secondary rotating arm in this embodiment.

[0026] Figure 11 This is a schematic diagram of the secondary rotating seat in this embodiment.

[0027] Figure 12 This is a schematic diagram of the four-level fixing base in this embodiment.

[0028] Figure 13 This is a schematic diagram of the seat connector in this embodiment.

[0029] Figure 14 This is a schematic diagram of the secondary stop seat in this embodiment.

[0030] Figure 15 This is a schematic diagram of the three-stage fixing base in this embodiment.

[0031] Figure 16 This is a schematic diagram of the locking assembly in this embodiment.

[0032] Figure 17 This is a schematic diagram of the top pressure handle in this embodiment.

[0033] Figure 18 This is a schematic diagram of the headrest in this embodiment two.

[0034] Figure 19 This is an exploded schematic diagram of the headrest in this embodiment two.

[0035] Figure 20 This is a schematic diagram of the secondary rotating arm in this embodiment two.

[0036] Figure 21 This is a schematic diagram of the secondary rotating seat in this embodiment two.

[0037] Figure 22 This is a schematic diagram of the four-stage fixing base in this embodiment two.

[0038] Figure 23 This is a schematic diagram of the seat connector in Embodiment 2.

[0039] Among them, 1-headrest connector, 11-secondary hinge hole, 111-secondary connecting boss, 12-secondary fixing seat, 13-first-stage stop seat, 131-secondary stop tooth, 2-seat connector, 21-tertiary hinge hole, 211-tertiary connecting boss, 22-tertiary fixing seat, 23-secondary stop seat, 231-tertiary stop tooth, 3-first-stage rotating arm, 31-first-stage hinge hole, 311-first-stage connecting boss, 32 - Primary fixed seat, 33- Primary rotating seat, 331- Primary stop tooth, 4- Locking assembly, 41- Movable shaft, 42- Top pressure handle, 421- Connecting hole, 43- Elastic element, 44- Buffer pad ring, 45- Top pressure block, 5- Secondary rotating arm, 51- Fourth-stage hinge hole, 511- Fourth-stage connecting boss, 52- Fourth-stage fixed seat, 53- Secondary rotating seat, 531- Fourth-stage stop tooth, 6- Support beam, 7- Support plate. Detailed Implementation

[0040] To facilitate understanding of this utility model, a more complete description of it is provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model. Example

[0041] See appendix Figure 1-17 As shown, in this embodiment, a multi-level adjustable headrest structure includes a headrest body (not shown in the figure), a headrest connector 1 mounted on the back of the headrest body, a seat connector 2, and a first-stage rotating arm 3. The seat connector 2 is mounted on a preset seat body. Both ends of the first-stage rotating arm 3 are rotatably connected to the rotating ends of the headrest connector 1 and the seat connector 2 respectively through preset locking components 4. Through the rotatable connections at the above two locations, the movable range of the headrest body is relatively increased. The rotatable connection between the first-stage rotating arm 3 and the headrest connector 1 (i.e., first-stage adjustment) enables the headrest body to swing up and down around that position. The rotatable connection between the first-stage rotating arm 3 and the seat connector 2 (i.e., second-stage adjustment) enables the headrest body to swing back and forth around that connection position to a greater extent (the vertical height of the headrest body is adjusted by rotation, increasing the adjustment range of the headrest body). Thus, the multi-level adjustment of the headrest structure in this embodiment is achieved (for specific rotation details, please refer to the appendix). Figure 5 , 6 (As shown by the arrow), and through the above two adjustments, it can be adapted to the user's needs, and the height position of the headrest body can be adjusted during swinging, thereby improving the user's suitability and user experience.

[0042] See appendix Figure 1-3As shown, it should be noted that the seat body is provided with a support beam 6 that is connected to the seat connector 2. One or more primary connecting screw holes are opened on one end of the support beam 6. Correspondingly, one or more secondary connecting screw holes are opened on the fixed end of the seat connector 2 and are connected and cooperate with the primary connecting screw holes (the primary connecting screw holes and the secondary connecting screw holes are connected by a pre-set bolt. The specific installation method can be set according to the actual situation).

[0043] See appendix Figure 4 , 16 As shown in Figure 17, in this embodiment, each locking assembly 4 includes a movable shaft 41, an elastic element 43 sleeved on the outer circumferential surface of the movable shaft 41, and a top-pressing handle 42 rotatably connected to one end of the movable shaft 41. The movable shaft 41 is used for coaxially fitting the connection point between one end of the first-stage rotating arm 3 and the rotating end of the headrest connector 1 or the connection point between the other end of the first-stage rotating arm 3 and the rotating end of the seat connector 2. A top-pressing block 45 is installed on the other end of the movable shaft 41 to lock and stop the above-mentioned connections in conjunction with the top-pressing handle 42. By setting the top-pressing block 45, the other end of the movable shaft 41 is connected to the headrest connector 1 or the seat connector 2, so that the top-pressing handle 42 can press the first-stage rotating arm 3 by (rotation), thereby locking the first-stage rotating arm. 3. It is pressed and fixed to the headrest connector 1 or the seat connector 2 to achieve the purpose of pressing and locking. Secondly, the pressing block 45 can be a nut. The two pins of the elastic element 43 are respectively connected to one end of the first-stage rotating arm 3 and the rotating end of the headrest connector 1 or the other end of the first-stage rotating arm 3 and the rotating end of the seat connector 2. When the locking assembly 4 is switched to the loosening mode, the elastic element 43 can push and separate the connection between the first-stage rotating arm 3 and the headrest connector 1 or the connection between the first-stage rotating arm 3 and the seat connector 2 to a certain distance through the elastic tendency of the elastic element 43, so that the first-stage rotating arm 3, the headrest connector 1 and the seat connector 2 can be restored to the function of rotation, and the user can adjust the relative position of the headrest body himself.

[0044] The locking components 4 at the aforementioned connections enable switchable locking and unlocking rotation at the connection between the primary rotating arm 3 and the headrest connector 1, and at the connection between the primary rotating arm 3 and the seat connector 2. Specifically, by rotating the pressing handle 42 in the forward direction, the pressing end of the pressing handle 42 pushes against the end of the primary rotating arm 3, causing the primary rotating arm 3 to overcome the elastic reaction force of the elastic member 43, thus locking the connection between one end of the primary rotating arm 3 and the rotating end of the headrest connector 1, or the connection between the other end of the primary rotating arm 3 and the rotating end of the seat connector 2. By rotating the pressing handle 42 in the reverse direction, the end of the primary rotating arm 3, driven by the elastic force of the elastic member 43, unlocks the connection between one end of the primary rotating arm 3 and the rotating end of the headrest connector 1, or the connection between the other end of the primary rotating arm 3 and the rotating end of the seat connector 2.

[0045] See appendix Figure 4 As shown, in this embodiment, each locking component 4 further includes a buffer pad ring 44 disposed on the movable shaft 41 (preferably, the buffer pad ring 44 is disposed between the pressing handle 42 and the first-stage fixed seat 32, and the buffer pad ring 44 can be made of an elastically deformable material, such as rubber). When the pressing handle 42 presses against one side of the first-stage fixed seat 32, the buffer pad ring 44 can relatively reduce the force exerted by the pressing handle 42 on the first-stage fixed seat 32, thereby extending the service life of the first-stage fixed seat 32. Furthermore, the buffer pad ring... The setting of 44 can relatively increase the pressing / clamping force of the top pressure handle 42 and the other end of the movable shaft 41 on the two connection points, so that the adjacent meshing parts can be stably engaged and improve the headrest's anti-displacement ability. In addition, in order to cooperate with the pressing of the top pressure handle 42, one side of the buffer pad ring 44 is provided with an arc-shaped notch similar in shape to the pressing end of the top pressure handle 42. The setting of the arc-shaped notch can relatively increase the contact area between the buffer pad ring 44 and the pressing end of the top pressure handle 42, thereby better improving the pressing and fixing effect of the top pressure handle 42 on the two connection points.

[0046] Furthermore, a through-hole is provided on one end of the movable shaft 41, and a through-hole and eccentrically arranged connecting hole 421 is provided on the pressing handle 42. The connecting hole 421 and the rotating hole can be connected by a pre-set connecting pin. The eccentric structure of the connecting hole 421, in conjunction with the pressing handle, can achieve the purpose of locking and unlocking. See the attached document for details. Figure 17 As shown, in Figure 17 In the (locked) state, the pressing end of the pressing handle 42 is located to the right of the connecting hole 421 (not marked in the figure).

[0047] See appendix Figure 10 As shown, in this embodiment, a primary hinge hole 31 is provided on both ends of the primary rotating arm 3, a secondary hinge hole 11 is provided on the rotating end of the headrest connector 1 to hinge with one of the primary hinge holes 31, and a tertiary hinge hole 21 is provided on the rotating end of the seat connector 2 to hinge with the other primary hinge hole 31. The above-mentioned hinge holes are configured to provide space for the movable shaft 41 to pass through.

[0048] See appendix Figure 7 , 10As shown in Figure 13, furthermore, each of the first-stage hinge holes 31 at both ends of the first-stage rotating arm 3 is formed with a first-stage connecting boss 311. The first-stage connecting boss 311 is used to connect to one end of a certain elastic member 43. A second-stage connecting boss 111 is protruding from the second-stage hinge hole 11 on the rotating end of the headrest connector 1. The second-stage connecting boss 111 is used to connect to the other end of a certain elastic member 43. A third-stage connecting boss 211 is protruding from the third-stage hinge hole 21 on the rotating end of the seat connector 2. The third-stage connecting boss 211 is used to connect to the other end of another elastic member 43. The first-stage connecting boss 311, the inner wall of the first-stage hinge hole 31 and the second-stage hinge hole 11, and the second-stage connecting boss 111 together form a first-stage accommodating cavity that can accommodate the elastic member 43. Similarly, the first-stage connecting boss 311, the inner wall of the first-stage hinge hole 31 and the third-stage hinge hole 21, and the third-stage connecting boss 211 together form a second-stage accommodating cavity that can accommodate the elastic member 43. The elastic element 43, due to its elastic tendency, compresses (stores energy) the elastic element 43 within the primary or secondary accommodating cavity when the locking assembly 4 is in the locking mode (i.e., the top pressing end of the top pressing handle 42 cooperates with the top pressing block 45 on the other end of the movable shaft 41, pressing and locking the connection between the first-stage rotating arm 3 and the headrest connector 1 or the connection between the first-stage rotating arm 3 and the seat connector 2). When the locking assembly 4 switches from the locking mode to the unlocking mode, due to the elastic tendency (reset and release energy) of the elastic element 43, the two ends of the elastic element 43 push the first-stage connecting boss 311 and the second-stage connecting boss 111 or the first-stage connecting boss 311 and the third-stage connecting boss 211 respectively, causing the connection between one end of the first-stage rotating arm 3 and the rotating end of the headrest connector 1 or the connection between the other end of the first-stage rotating arm 3 and the rotating end of the seat connector 2 to separate (to a certain distance), restoring the rotatable adjustment function at the connection, thereby achieving the purpose of switching between top pressing locking and unlocking rotation.

[0049] See appendix Figure 7-15As shown, in this embodiment, the primary rotating arm 3 includes a primary fixed seat 32 and a primary rotating seat 33. The primary rotating seat 33 is mounted on the primary fixed seat 32, and multiple annularly arranged primary stop teeth 331 protrude from both ends of one side of the primary rotating seat 33. The headrest connector 1 includes a secondary fixed seat 12 and a primary stop seat 13. The primary stop seat 13 is mounted on the secondary fixed seat 12, and multiple annularly arranged secondary stop teeth 131 protrude from one end of the primary stop seat 13. The multiple secondary stop teeth 131 on the primary stop seat 13 can be separably engaged with the multiple primary stop teeth 331 on one end of the primary rotating seat 33. The seat connector 2 includes a tertiary fixed seat 22 and a secondary stop seat 23. The secondary stop seat 23 is mounted on the tertiary fixed seat 22. On the second-stage stop seat 23, a plurality of annularly arranged tertiary stop teeth 231 are protruding from one side end. The plurality of tertiary stop teeth 231 on the second-stage stop seat 23 can be separably engaged with the plurality of primary stop teeth 331 on the other end of the primary rotating seat 33. The corresponding fixed seat and rotating seat, and the fixed seat and stop seat can be connected by a pre-set screw. Through the engagement of the aforementioned stop teeth, the corresponding locking component 4 is switched to the locking mode, so that the relative plurality of primary stop teeth 331 and secondary stop teeth 131, and primary stop teeth 331 and tertiary stop teeth 231 approach each other and engage to stop, thereby restricting the rotation between the primary rotating arm 3, the headrest connector 1 and the seat connector 2, and stably maintaining the relative position of the headrest body after adjustment, preventing the headrest body from shifting. Example

[0050] This second embodiment differs from the first embodiment in the following aspects: (See Appendix) Figure 18-23 As shown, the primary rotating arm 3 and the seat connector 2 are adjustablely connected by a pre-set secondary rotating arm 5. One end of the secondary rotating arm 5 is arranged on the same axis as one end of the primary rotating arm 3 and one end of the secondary rotating arm 5 is arranged on the same axis as the rotating end of the seat connector 2 through the locking assembly 4. The setting of the secondary rotating arm 5 further increases the adjustable range of the headrest structure of this embodiment, and relatively increases the adaptability to the user.

[0051] It should be noted that the seat connector 2 is provided with at least two, preferably four, connecting screw holes, and the seat body is provided with a support plate 7 that is connected to the seat connector 2. The connecting screw holes can be pre-set with bolts that are assembled on the support plate 7.

[0052] See appendix Figure 18-23As shown, the secondary rotating arm 5 further includes a fourth-stage fixed seat 52 and a secondary rotating seat 53. The secondary rotating seat 53 is mounted on the fourth-stage fixed seat 52. Multiple annularly arranged fourth-stage stop teeth 531 protrude from both ends of one side of the secondary rotating seat 53. The multiple fourth-stage stop teeth 531 on the secondary rotating seat 53 can be separably engaged with multiple first-stage stop teeth 331 on one end of the first-stage rotating seat 33 and multiple third-stage stop teeth 231 on the secondary stop seat 23. This allows the opposing multiple first-stage stop teeth 331 and fourth-stage stop teeth 531, and the fourth-stage stop teeth 531 and third-stage stop teeth 231 to approach and engage with each other to stop rotation, thereby restricting the rotation between the first-stage rotating arm 3, the secondary rotating arm 5, and the seat connector 2. This can stably maintain the relative position of the headrest body after adjustment and prevent the headrest body from shifting.

[0053] See appendix Figure 20-22 As shown, furthermore, each end of the secondary rotating seat 53 is provided with a fourth-level hinge hole 51, which is respectively hinged to one end of the primary rotating seat 33 and the rotating end of the seat connector 2. The hinge hole is configured to provide space for the movable shaft 41 to pass through, thereby realizing the rotational engagement between the primary rotating arm 3, the secondary rotating arm 5 and the seat connector 2; a fourth-level connecting boss 511 is protruding in the fourth-level hinge hole 51, which is used to connect to the other end of one of the elastic members 43. The aforementioned primary connecting boss 311 and primary hinge hole The fourth-level hinge hole 51, together with the inner wall of the fourth-level hinge hole 51 and the fourth-level connecting boss 511, together form a third-level accommodating cavity that can accommodate the elastic element 43. Similarly, the fourth-level connecting boss 511, the fourth-level hinge hole 51, together with the inner wall of the third-level hinge hole 21 and the third-level connecting boss 211, together form a fourth-level accommodating cavity that can accommodate the elastic element 43. By setting the third-level accommodating cavity and the fourth-level accommodating cavity, it is ensured that the elastic element 43 can push and separate the connection between one end of the second-level rotating arm 5 and one end of the first-level rotating arm 3, as well as the connection between one end of the second-level rotating arm 5 and the rotating end of the seat connector 2.

[0054] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any modifications or alterations made by those skilled in the art to the technical solution of this utility model without departing from its scope are equivalent embodiments of this utility model. Therefore, all equivalent changes made based on the concept of this utility model without departing from its scope should be covered within the protection scope of this utility model.

Claims

1. A multi-level adjustable headrest structure, characterized in that: The device includes a headrest body, a headrest connector (1) mounted on the back of the headrest body, a seat connector (2), and a first-stage rotating arm (3). The seat connector (2) is mounted on a preset seat body. Both ends of the first-stage rotating arm (3) are rotatably connected to the rotating ends of the headrest connector (1) and the seat connector (2) respectively through preset locking components (4). Each locking component (4) includes a movable shaft (41), an elastic element (43) sleeved on the outer circumference of the movable shaft (41), and a top pressure handle (42) rotatably connected to one end of the movable shaft (41). The movable shaft (41) is used for the connection between one end of the first-stage rotating arm (3) and the rotating end of the headrest connector (1) or the connection between the other end of the first-stage rotating arm (3) and the rotating end of the seat connector (2) to be mounted on the same shaft. The other end of the movable shaft (41) is equipped with a top pressure block (45) that cooperates with the top pressure handle (42) to lock and stop the above-mentioned connections. The two pins of the elastic element (43) are respectively connected to the rotating end of one end of the first-stage rotating arm (3) and the rotating end of the headrest connector (1) or the rotating end of the other end of the first-stage rotating arm (3) and the rotating end of the seat connector (2). By rotating the top pressure handle (42) in the forward direction, the top pressure end of the top pressure handle (42) pushes the end of the first-stage rotating arm (3), so that the first-stage rotating arm (3) overcomes the elastic reaction force of the elastic element (43) and achieves top pressure locking at the connection between one end of the first-stage rotating arm (3) and the rotating end of the headrest connector (1) or the connection between the other end of the first-stage rotating arm (3) and the rotating end of the seat connector (2). By rotating the top pressure handle (42) in the reverse direction, the end of the first-stage rotating arm (3) is released from the connection between one end of the first-stage rotating arm (3) and the rotating end of the headrest connector (1) or the connection between the other end of the first-stage rotating arm (3) and the rotating end of the seat connector (2) under the elastic force of the elastic element (43).

2. The multi-level adjustable headrest structure according to claim 1, characterized in that: The movable shaft (41) has a through rotating hole at one end, and the top pressure handle (42) has an eccentrically arranged connecting hole (421) that is aligned with the connecting hole (421).

3. The multi-level adjustable headrest structure according to claim 1, characterized in that: The first-stage rotating arm (3) has a first-stage hinge hole (31) at both ends. The rotating end of the headrest connector (1) has a second-stage hinge hole (11) that is hinged to one of the first-stage hinge holes (31). The rotating end of the seat connector (2) has a third-stage hinge hole (21) that is hinged to the other first-stage hinge hole (31).

4. The multi-level adjustable headrest structure according to claim 3, characterized in that: The first-level connecting boss (311) is formed in the first-level hinge hole (31) at both ends of the first-level rotating arm (3). The first-level connecting boss (311) is used to connect to one end of a certain elastic element (43). The second-level connecting boss (111) is formed in the second-level hinge hole (11) on the rotating end of the headrest connector (1). The second-level connecting boss (111) is used to connect to the other end of a certain elastic element (43). The third-level connecting boss (211) is formed in the third-level hinge hole (21) on the rotating end of the seat connector (2). The third-level connecting boss (211) is used to connect to the other end of another elastic element (43).

5. The multi-level adjustable headrest structure according to claim 1, characterized in that: The first-stage rotating arm (3) is provided with a first-stage engagement part at both ends, and the rotating end of the headrest connector (1) and the rotating end of the seat connector (2) are provided with a second-stage engagement part that can engage and disengage with the engagement part.

6. The multi-level adjustable headrest structure according to claim 5, characterized in that: The primary rotating arm (3) includes a primary fixed seat (32) and a primary rotating seat (33). The primary rotating seat (33) is mounted on the primary fixed seat (32). Multiple annularly arranged primary stop teeth (331) are protruding from both ends of one side of the primary rotating seat (33). The headrest connector (1) includes a secondary fixed seat (12) and a primary stop seat (13). The primary stop seat (13) is mounted on the secondary fixed seat (12). Multiple annularly arranged secondary stop teeth (131) are protruding from one end of the primary stop seat (13). The seat connector (2) includes a third-level fixed seat (22) and a second-level stop seat (23). The second-level stop seat (23) is mounted on the third-level fixed seat (22). A plurality of annularly arranged third-level stop teeth (231) are protruding from one side of the second-level stop seat (23). The plurality of third-level stop teeth (231) on the second-level stop seat (23) are separably engaged with a plurality of first-level stop teeth (331) on the other side of the first-level rotating seat (33).

7. The multi-level adjustable headrest structure according to claim 6, characterized in that: The primary rotating arm (3) and the seat connector (2) are rotatably connected by a pre-set secondary rotating arm (5). One end of the secondary rotating arm (5) and one end of the primary rotating arm (3) and one end of the secondary rotating arm (5) and the rotating end of the seat connector (2) are arranged on the same axis by a locking assembly (4).

8. The multi-level adjustable headrest structure according to claim 7, characterized in that: The two ends of the secondary rotating arm (5) are provided with four-level hinge holes (51). The first-level hinge hole (31) on one end of the first-level rotating arm (3) is hinged to the four-level hinge hole (51) on one end of the secondary rotating arm (5). The third-level hinge hole (21) on the rotating end of the seat connector (2) is hinged to the four-level hinge hole (51) on the other end of the secondary rotating arm (5).

9. A multi-level adjustable headrest structure according to claim 8, characterized in that: The four-level connecting bosses (511) are formed in the four-level hinge holes (51) at both ends of the secondary rotating arm (5). The four-level connecting bosses (511) are used to connect to one end of a certain elastic element (43).

10. A multi-level adjustable headrest structure according to claim 8, characterized in that: The secondary rotating arm (5) includes a fourth-level fixed seat (52) and a secondary rotating seat (53). The secondary rotating seat (53) is mounted on the fourth-level fixed seat (52). Multiple annularly arranged fourth-level stop teeth (531) are protruding from both ends of one side of the secondary rotating seat (53). The multiple fourth-level stop teeth (531) on both ends of the secondary rotating seat (53) can be separably engaged with multiple first-level stop teeth (331) on one end of the first-level rotating seat (33) and multiple third-level stop teeth (231) on the secondary stop seat (23).

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