Ergonomic chair headrest capable of being adjusted at multiple angles and ergonomic chair

Abstract

The utility model relates to a multi-angle adjustable ergonomic chair headrest and an ergonomic chair, which comprise a vertical support arm, the top of the vertical support arm is hinged with a swing adjusting cantilever rotating around a first shaft, and an angle adjusting locking mechanism is arranged between the vertical support arm and the swing adjusting cantilever. At least part of the angle adjusting and locking mechanism is arranged on the vertical supporting arm, the remaining part of the angle adjusting and locking mechanism is arranged on the swing adjusting cantilever, and the swing adjusting cantilever is connected with a headrest support through a position adjusting and locking mechanism sliding in the direction of a second shaft perpendicular to the first shaft. At least part of the position adjusting and locking mechanism is arranged on the swing adjusting cantilever, the rest part of the position adjusting and locking mechanism is arranged on the headrest support, and the headrest support is connected with a headrest frame through a hinge mechanism, and the headrest frame rotates around a third shaft parallel to the first shaft.

Description

Technical Field

[0001] This application relates to the field of seating technology, and more particularly to an ergonomic chair headrest and ergonomic chair with multi-angle adjustable headrest. Background Technology

[0002] A headrest is an accessory on an ergonomic chair or swivel chair. Existing swivel chair headrests generally have the functions of adjusting the height and tilt angle. However, the fore-and-aft position of the headrest cannot be adjusted for users of different body types, which means that the function of the headrest needs further optimization.

[0003] Therefore, we propose an ergonomic chair headrest and ergonomic chair that can be adjusted at multiple angles. Utility Model Content

[0004] The main purpose of this application is to provide an ergonomic chair headrest and ergonomic chair with multi-angle adjustable headrest, aiming to solve the problem of the single angle adjustment function of the ergonomic chair headrest in the prior art.

[0005] To achieve the above objectives, this application provides a multi-angle adjustable ergonomic chair headrest, including a vertical support arm, a swing adjustment cantilever hinged to the top of the vertical support arm and rotating about a first axis, an angle adjustment locking mechanism provided between the vertical support arm and the swing adjustment cantilever, at least a portion of the angle adjustment locking mechanism being located on the vertical support arm and the remaining portion being located on the swing adjustment cantilever, the swing adjustment cantilever being connected to a headrest bracket via a position adjustment locking mechanism that slides along a second axis perpendicular to the first axis, at least a portion of the position adjustment locking mechanism being located on the swing adjustment cantilever and the remaining portion being located on the headrest bracket, the headrest bracket being connected to a headrest frame that rotates about a third axis parallel to the first axis via a hinge mechanism.

[0006] Preferably, the headrest support is provided with a connecting arm that extends axially along the third axis, and both ends of the connecting arm are respectively hinged to the headrest frame through the hinge mechanism.

[0007] Preferably, the angle adjustment locking mechanism includes an elastic locking component and a plurality of circumferentially distributed locking adjustment positions. The elastic locking component engages with at least one of the locking adjustment positions in a concave-convex manner. Either the elastic locking component or the locking adjustment position is located on the vertical support arm, and the remaining one is located on the swing adjustment cantilever.

[0008] Preferably, the locking adjustment position is provided at the top of the vertical support arm, and the elastic locking component is provided on the swing adjustment cantilever.

[0009] Preferably, the resilient locking component includes a latch having a locking position that matches the locking adjustment position, and an elastic element provided on the side of the latch away from the locking adjustment position that locks the latch and the locking adjustment position.

[0010] Preferably, the position adjustment and locking mechanism includes an elastic locking member with one end hinged to the headrest bracket, an annular track groove on the swing adjustment cantilever, and a toothed locking part on the swing adjustment cantilever, wherein the toothed grooves of the locking part are respectively connected to the annular track groove, and the end of the elastic locking member away from its hinge is engaged in any one of the toothed grooves.

[0011] Preferably, the grooves are all oblique grooves and are inclined outward toward one side of the headrest frame.

[0012] Preferably, the vertical support arm is slidably connected to the fixed base, and a vertical position adjustment and locking mechanism is provided between the vertical support arm and the fixed base. At least a part of the vertical position adjustment and locking mechanism is provided on the vertical support arm, and the remaining part is provided on the fixed base.

[0013] Preferably, the vertical position adjustment and locking mechanism includes a locking ball and a plurality of locking grooves spaced apart along the vertical direction. The locking ball is at least partially inserted into the locking groove by a transverse spring. Either the locking ball or the locking groove is located on the fixed base, and the remaining one is located on the vertical support arm.

[0014] To achieve the above objectives, this application also provides an ergonomic chair, which includes the aforementioned multi-angle adjustable ergonomic chair headrest.

[0015] The beneficial effects of this utility model's technical solution are as follows:

[0016] By incorporating an angle adjustment and locking mechanism between the vertical support arm and the swing adjustment cantilever, users can easily and precisely adjust the headrest angle around the first axis according to their individual needs. Stable support at different tilt angles can be achieved without the need for complex tools or cumbersome procedures, meeting the headrest angle adjustment needs of different users in various usage scenarios such as sitting and lying positions.

[0017] The angle-adjustable locking mechanism, with its portion located in the vertical support arm and partly in the swing adjustment cantilever, ensures a more secure and reliable lock. Even when the user's head is subjected to pressure or frequent movement, the headrest remains at the set angle position without unexpected shaking or shifting, providing a stable and comfortable support experience.

[0018] The position adjustment and locking mechanism is installed on both the swing adjustment cantilever and the headrest bracket, providing the headrest with horizontal position adjustment capability. Users can easily adjust the headrest to their most suitable lateral position based on their body shape, sitting posture, and the overall layout of the chair. The distributed locking structure ensures precise fixation of the headrest position. Once the user has completed the position adjustment, the locking mechanism quickly and effectively locks the headrest in the set position, preventing slippage or displacement during normal use and ensuring that the headrest always maintains an accurate relative position with the user's head, providing continuous and stable support.

[0019] The headrest support is connected to the headrest frame, which rotates around a third axis parallel to the first axis, via a hinge mechanism, allowing the headrest frame to be adjusted in multiple planes. Combined with the aforementioned angle and position adjustment functions, the headrest can be flexibly changed in all directions and at multiple angles, thus better conforming to the head curves and posture changes of different users. Attached Figure Description

[0020] Figure 1 This is a side view of an ergonomic chair headrest that can be adjusted at multiple angles according to one embodiment of this application;

[0021] Figure 2 This is a side sectional view of an ergonomic chair headrest that can be adjusted at multiple angles according to one embodiment of this application;

[0022] Figure 3 This is an isometric view of an ergonomic chair headrest that is adjustable at multiple angles according to one embodiment of this application;

[0023] Figure 4 for Figure 2 Enlarged view of the local structure of region A in the middle;

[0024] Figure 5 This is an isometric view of a multi-angle adjustable ergonomic chair headrest according to another embodiment of this application;

[0025] Figure 6 for Figure 5 Enlarged view of the local structure of region B in the middle;

[0026] Figure 7 This is a side sectional view of an ergonomic chair headrest that can be adjusted at multiple angles, according to another embodiment of this application.

[0027] Figure 8 for Figure 7 Enlarged view of the local structure of region C in the middle;

[0028] Figure 9 This is a schematic diagram of the vertical position adjustment and locking mechanism in one embodiment of this application. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these 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 intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] Furthermore, descriptions using terms such as "first" and "second" in this application are for descriptive purposes only (e.g., to distinguish identical or similar elements) and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, technical solutions from different embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed in this application.

[0031] See Figures 1-3 This utility model proposes an ergonomic chair headrest that can be adjusted at multiple angles, including a vertical support arm 100. A swing adjustment cantilever 200 that rotates about a first axis is hinged to the top of the vertical support arm 100. An angle adjustment locking mechanism 300 is provided between the vertical support arm 100 and the swing adjustment cantilever 200. At least a part of the angle adjustment locking mechanism 300 is provided on the vertical support arm 100, and the remaining part of the angle adjustment locking mechanism 300 is provided on the swing adjustment cantilever 200. The swing adjustment cantilever 200 is connected to a headrest bracket 500 by a position adjustment locking mechanism 400 that slides along a second axis perpendicular to the first axis. At least a part of the position adjustment locking mechanism 400 is provided on the swing adjustment cantilever 200, and the remaining part of the position adjustment locking mechanism 400 is provided on the headrest bracket 500. The headrest bracket 500 is connected to a headrest frame 600 that rotates about a third axis parallel to the first axis by a hinge mechanism 1000. The hinge mechanism 1000, for example, generates frictional damping between screws after assembly, allowing the headrest support 500 to move under force without interference.

[0032] In this embodiment, by setting an angle adjustment and locking mechanism 300 between the vertical support arm 100 and the swing adjustment cantilever 200, the user can easily and precisely adjust the headrest angle around the first axis according to their personal needs. Stable support of the headrest at different tilt angles can be achieved without the need for complex tools or cumbersome operating procedures, meeting the headrest angle adjustment needs of different users in various usage scenarios such as sitting and lying positions. At the same time, the angle adjustment and locking mechanism 300, with its partial location on the vertical support arm 100 and partial location on the swing adjustment cantilever 200, makes the locking more secure and reliable. Even when the user's head is subjected to certain pressure or frequent movement, the headrest can always maintain the set angle position without accidental shaking or displacement, providing the user with a stable and comfortable support experience.

[0033] On the other hand, the position adjustment and locking mechanism 400 is provided with corresponding parts on the swing adjustment cantilever 200 and the headrest bracket 500, giving the headrest the function of horizontal position adjustment. Users can easily adjust the headrest to the most suitable lateral position according to their body characteristics, sitting posture habits, and the overall layout of the seat. The distributed locking structure can achieve precise fixation of the headrest position. After the user completes the position adjustment, the locking mechanism can quickly and effectively lock the headrest in the set position, preventing it from sliding or shifting during normal use, ensuring that the headrest always maintains an accurate relative position with the user's head, and providing continuous and stable support.

[0034] Furthermore, the headrest support 500 is connected to the headrest frame 600, which rotates about a third axis parallel to the first axis, via a hinge mechanism 1000. This allows the headrest frame 600 to adaptively adjust its angle to suit the user. Combined with the aforementioned angle and position adjustment functions, the headrest can be flexibly adjusted in all directions and at multiple angles to better fit the head curves and posture changes of different users. Whether it's providing support to the side of the head when resting on one's side or providing precise support to the back of the head when sitting normally, this is achieved through the coordinated action of the various adjustment mechanisms, effectively reducing pressure on the head and neck and improving user comfort.

[0035] Among them, the first axis and the second axis respectively correspond to Figure 3 The X and Y axes of the coordinate system make the headrest adjustment direction relative to... Figure 3 The spatial coordinate system is consistent with that of the system, which further clarifies the direction of motion and range of action of each adjustment mechanism.

[0036] In practical use, when the user adjusts the angle of the swing adjustment arm 200 around the first axis (i.e., the X-axis), the tilt angle of the headrest in the vertical plane can be changed to adapt to the angle requirements of the head and neck in different sitting or lying positions. For example, when the user needs to lean back slightly to rest, the headrest can be tilted back appropriately through the angle adjustment locking mechanism 300 to provide more comfortable support for the head; while when the user maintains an upright sitting posture, the headrest can be adjusted to a suitable forward tilt angle to provide good support for the neck.

[0037] Meanwhile, the position adjustment locking mechanism 400, which slides along the second axis (i.e., the Y-axis), allows the headrest to be adjusted horizontally. Users can precisely adjust the headrest to a position directly opposite their head based on their body characteristics, such as shoulder width and build, as well as the overall layout of the seat. Regardless of whether the user's head is naturally tilted to the left or right, the headrest accurately conforms to the head, providing stable and comfortable support, effectively preventing neck muscle tension or fatigue caused by improper headrest positioning.

[0038] Furthermore, the design of the headrest frame 600 rotating around a third axis parallel to the first axis further enhances the headrest's flexibility and adaptability. The third axis is actually parallel to the first axis (X-axis), meaning the headrest frame 600 can be rotated and adjusted within the same plane as the first axis. Combined with the aforementioned angle and position adjustment functions, the headrest can achieve flexible, multi-directional changes in three-dimensional space. For example, when the user is resting on their side, the headrest frame 600 can rotate around the third axis, allowing one side of the headrest to better conform to the side of the head, providing stable support and reducing neck pressure; while in a normal sitting posture, the headrest frame 600 can be adjusted to a suitable angle, precisely supporting the back of the head and ensuring the head always maintains a comfortable posture.

[0039] In one embodiment, the headrest support 500 is provided with a connecting arm 700 extending axially along a third axis, and the two ends of the connecting arm 700 are respectively hinged to the headrest frame 600 through a hinge mechanism 1000.

[0040] Among them, the connecting arm 700 is an arc-shaped rod whose curvature matches the physiological curve of the back of the human head, and its surface is covered with a layer of buffer rubber.

[0041] In this embodiment, by setting an arc-shaped connecting arm 700 adapted to the physiological curve of the human head, and combining it with a buffer rubber layer and a two-way hinge mechanism 1000, the headrest frame 600 can maintain stable and controllable angle adjustment when rotating around the third axis, avoiding wobbling or tilting that may be caused by a single-point hinge. Simultaneously, the two-way hinge ensures that the headrest frame 600 always moves synchronously with the connecting arm 700 during adjustment, ensuring a uniform distribution of support force and further improving the stability and reliability of the headrest. Furthermore, it allows the headrest frame 600 to more naturally conform to the back contour of the user's head when rotating around the third axis, especially in the area where the neck connects to the head. Whether working with the head down or resting with the head tilted back, the arc-shaped structure of the connecting arm 700 provides stable support for the head, avoiding the pressure or insufficient support problems that may occur with traditional straight rod structures, effectively dispersing head pressure and improving comfort during prolonged use.

[0042] Furthermore, the arc-shaped design of the connecting arm 700, combined with the hinge mechanism 1000, allows the headrest frame 600 to be adjusted in angle on multiple planes. Specifically, when the user needs lateral support, the headrest frame 600 can rotate around a third axis, combined with the arc-shaped guide of the connecting arm 700, to achieve precise support for the side of the head; while in a normal sitting posture, the headrest frame 600 can adjust the angle with the connecting arm 700 to conform to the physiological curve of the back of the head.

[0043] See Figure 4 In one embodiment, the angle adjustment locking mechanism 300 includes an elastic locking component 301 and a plurality of circumferentially distributed locking adjustment positions 302. The elastic locking component 301 engages with at least one locking adjustment position 302. Either the elastic locking component 301 or the locking adjustment position 302 is located on the vertical support arm 100, and the remaining one is located on the swing adjustment cantilever 200.

[0044] Furthermore, a locking adjustment position 302 is provided at the top of the vertical support arm 100, and an elastic locking component 301 is provided on the swing adjustment cantilever 200.

[0045] In this embodiment, by placing the elastic locking component 301 on the swing adjustment cantilever 200 and the locking adjustment position 302 on the top of the vertical support arm 100, the angle adjustment locking mechanism 300 achieves an efficient and reliable locking function. When it is necessary to adjust the angle of the swing adjustment cantilever 200, the operator only needs to apply an appropriate external force to the elastic locking component 301, causing it to overcome the elastic force and disengage from the currently engaged locking adjustment position 302. Subsequently, the swing adjustment cantilever 200 can be freely adjusted to the desired angle. Simultaneously, during the actual adjustment process, due to the elastic characteristics of the elastic locking component 301, it can automatically find and ultimately and stably lock onto the next nearest locking adjustment position 302, thereby achieving precise angle adjustment and stable locking.

[0046] Furthermore, several circumferentially distributed locking adjustment positions 302 provide multiple lockable positions for the swing adjustment cantilever 200, making angle adjustment more flexible and diverse, and able to meet the needs of different usage scenarios. At the same time, the concave-convex fit design between the elastic locking component 301 and the locking adjustment position 302 enhances the reliability and stability of locking, effectively preventing accidental unlocking due to vibration or accidental contact.

[0047] In one embodiment, the resilient locking member 301 includes a latch 303 having a locking adjustment position 302, and an elastic element 304 provided on the side of the latch 303 away from the locking adjustment position 302 to lock the latch 303 and the locking adjustment position 302.

[0048] See Figures 5-6 In one embodiment, the position adjustment locking mechanism 400 includes an elastic locking member 401 with one end hinged to the headrest bracket 500, an annular track groove 402 on the swing adjustment cantilever 200, and a toothed locking part 403 on the swing adjustment cantilever 200. The toothed grooves 404 of the locking part 403 are respectively connected to the annular track groove 402, and the end of the elastic locking member 401 away from its hinge is engaged in any one of the toothed grooves 404.

[0049] Furthermore, all grooves 404 are oblique grooves 404 and are tilted outward toward the side facing the headrest frame 600.

[0050] In this embodiment, the interlocking design between the locking tongue 303 and the locking adjustment position 302 makes the locking process more precise and reliable. The elastic force provided by the elastic element 304 ensures that the locking tongue 303 can fit tightly against the locking adjustment position 302, effectively preventing the swing adjustment arm 200 from accidentally disengaging from the locked position even when subjected to external vibration or impact.

[0051] On the other hand, when the angle of the swing adjustment arm 200 needs to be adjusted, the operator only needs to apply appropriate external force to the locking tongue 303 to overcome the elastic force of the elastic element 304, causing the locking tongue 303 to disengage from the current locking adjustment position 302. Furthermore, due to the presence of the elastic element 304, when the external force is removed, the locking tongue 303 can automatically reset and relock onto the next nearest locking adjustment position 302. This simplifies the operation process, ensures that the swing adjustment arm 200 can quickly return to a stable state after adjustment, and improves the efficiency and safety of the equipment.

[0052] See Figures 7-8 In one embodiment, the vertical support arm 100 is slidably connected to the external fixed base 800, and a vertical position adjustment and locking mechanism 900 is provided between the vertical support arm 100 and the fixed base 800. At least a portion of the vertical position adjustment and locking mechanism 900 is provided on the vertical support arm 100, and the remaining portion is provided on the fixed base 800.

[0053] Furthermore, the vertical position adjustment and locking mechanism 900 includes a locking ball 901 and a plurality of locking grooves 902 spaced apart along the vertical direction. The locking ball 901 is caused by a transverse spring 903 to allow at least a portion of the locking ball 901 to enter the locking groove 902. Either the locking ball 901 or the locking groove 902 is located on the fixed base 800, and the other is located on the vertical support arm 100.

[0054] In this embodiment, the design of the locking ball 901 and the locking groove 902 allows for precise vertical position adjustment of the vertical support arm 100 on the fixed base 800. When the height of the vertical support arm 100 needs to be adjusted, the operator only needs to apply an appropriate external force to the vertical support arm 100, causing the locking ball 901 to overcome the elastic force of the transverse spring 903 and disengage from the current locking groove 902. The vertical support arm 100 can then slide freely to the desired position. Furthermore, during the adjustment process, due to the presence of the transverse spring 903, when the external force is removed, the locking ball 901 can automatically find and ultimately and stably lock into the next nearest locking groove 902, thereby achieving precise vertical position adjustment and stable locking.

[0055] Furthermore, the design of the locking grooves 902, spaced apart along the vertical direction, provides multiple lockable positions for the vertical support arm 100, making height adjustment more flexible and versatile, and meeting the needs of different usage scenarios. At the same time, the elasticity provided by the transverse spring 903 ensures that the locking ball 901 can fit tightly in the locking groove 902, effectively preventing the vertical support arm 100 from accidentally sliding even under external vibration or impact.

[0056] See Figure 9In one embodiment, there are at least two vertical position adjustment locking mechanisms 900, and the two vertical position adjustment locking mechanisms 900 have the same structure.

[0057] The vertical position adjustment and locking mechanism 900 includes a locking ball 901 and several locking grooves 902 spaced apart along the vertical direction. Each locking groove 902 has an arc-shaped groove that matches the outer surface of the locking ball 901. The diameter of the locking ball 901 is slightly larger than the depth of the groove. The locking ball 901 is movably installed within any one of the locking grooves 902 in the vertical support arm 100 and partially protrudes from the outer surface of the vertical support arm 100. It is connected to a transverse spring 903 provided in the fixing seat 800. The spring force of the transverse spring 903 is perpendicular to the sliding direction of the vertical support arm 100. One end of the spring is fixed in the mounting hole of the fixing seat 800, and the other end is connected to the bottom of the locking ball 901. When the locking ball 901 is not subjected to external force, the elastic force of the transverse spring 903 presses at least a portion of the locking ball 901 into the arc-shaped groove of the locking groove 902, thereby achieving locking between the vertical support arm 100 and the fixed seat 800.

[0058] Furthermore, two vertical position adjustment and locking mechanisms 900 are arranged vertically at intervals on both sides of the vertical support arm 100 (e.g., symmetrically arranged).

[0059] This utility model also proposes an ergonomic chair, which includes the aforementioned multi-angle adjustable ergonomic chair headrest.

[0060] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or multi-angle adjustable ergonomic chair headrest that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, apparatus, article, or multi-angle adjustable ergonomic chair headrest. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or multi-angle adjustable ergonomic chair headrest that includes that element.

[0061] The above description is only a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A multi-angle adjustable ergonomic chair headrest, comprising a vertical support arm (100), wherein a swing-adjustable cantilever (200) that rotates about a first axis is hinged to the top of the vertical support arm (100), characterized in that, An angle adjustment locking mechanism (300) is provided between the vertical support arm (100) and the swing adjustment cantilever (200). At least a portion of the angle adjustment locking mechanism (300) is located on the vertical support arm (100), and the remaining portion of the angle adjustment locking mechanism (300) is located on the swing adjustment cantilever (200). The swing adjustment cantilever (200) is connected to a headrest bracket (500) via a position adjustment locking mechanism (400) that slides along a second axis perpendicular to the first axis. At least a portion of the position adjustment locking mechanism (400) is located on the swing adjustment cantilever (200), and the remaining portion of the position adjustment locking mechanism (400) is located on the headrest bracket (500). The headrest bracket (500) is connected to a headrest frame (600) that rotates about a third axis parallel to the first axis via a hinge mechanism (1000).

2. A multi-angle adjustable ergonomic chair headrest according to claim 1, characterized in that, The headrest support (500) is provided with a connecting arm (700) extending axially along the third axis, and the two ends of the connecting arm (700) are respectively hinged to the headrest frame (600) through the hinge mechanism (1000).

3. A multi-angle adjustable ergonomic chair headrest according to claim 1, characterized in that, The angle adjustment locking mechanism (300) includes an elastic locking component (301) and a plurality of circumferentially distributed locking adjustment positions (302). The elastic locking component (301) engages with at least one of the locking adjustment positions (302). Either the elastic locking component (301) or the locking adjustment position (302) is located on the vertical support arm (100), and the remaining one is located on the swing adjustment cantilever (200).

4. A multi-angle adjustable ergonomic chair headrest according to claim 3, characterized in that, The locking adjustment position (302) is provided at the top of the vertical support arm (100), and the elastic locking component (301) is provided on the swing adjustment cantilever (200).

5. A multi-angle adjustable ergonomic chair headrest according to claim 3 or 4, characterized in that, The resilient locking member (301) includes a latch (303) that matches the locking adjustment position (302), and an elastic element (304) provided on the side of the latch (303) away from the locking adjustment position (302) to lock the latch (303) and the locking adjustment position (302).

6. The ergonomic chair headrest with multi-angle adjustment according to claim 1, characterized in that, The position adjustment locking mechanism (400) includes an elastic locking member (401) hinged at one end to the headrest bracket (500), an annular track groove (402) provided on the swing adjustment cantilever (200), and a toothed locking part (403) on the swing adjustment cantilever (200). The tooth grooves (404) of the locking part (403) are respectively connected to the annular track groove (402), and the end of the elastic locking member (401) away from its hinge is engaged in any one of the tooth grooves (404).

7. A multi-angle adjustable ergonomic chair headrest according to claim 6, characterized in that, The grooves (404) are all oblique grooves (404) and are inclined outward toward the side facing the headrest frame (600).

8. The multi-angle adjustable ergonomic chair headrest of claim 1, wherein, The vertical support arm (100) is slidably connected to the fixed base (800). A vertical position adjustment and locking mechanism (900) is provided between the vertical support arm (100) and the fixed base (800). At least a part of the vertical position adjustment and locking mechanism (900) is provided on the vertical support arm (100), and the remaining part is provided on the fixed base (800).

9. A multi-angle adjustable ergonomic chair headrest according to claim 8, characterized in that, The vertical position adjustment and locking mechanism (900) includes a locking ball (901) and a plurality of locking grooves (902) spaced apart along the vertical direction. The locking ball (901) is made to enter at least a portion of the locking groove (902) by means of a transverse spring (903). Either the locking ball (901) or the locking groove (902) is located on the fixed base (800), and the other is located on the vertical support arm (100).

10. An ergonomic chair, characterized by The ergonomic chair includes a multi-angle adjustable ergonomic chair headrest as described in any one of claims 1-9.

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