Headrest

Abstract

This application relates to a headrest, including a first structural member, a second structural member, a pivot, and a locking assembly. The second structural member supports the user's head and is rotatably connected to the first structural member via the pivot. A portion of the locking assembly is disposed on the pivot, and the other portion is connected to the first structural member. The locking assembly restricts relative rotation between the first and second structural members. By rotatably connecting the second structural member to the first structural member via the pivot, the second structural member can rotate relative to the first structural member. This allows for adjustment of the angle between the two structural members, thereby adjusting the tilt angle of the second structural member to better adapt to the user's head posture, improving the headrest's adjustability and enhancing user comfort.

Description

[0001] This application claims the following priority: prior application number 202521105260.5, with a priority date of May 30, 2025. Although this application does not repeat the description of the aforementioned prior application, the description, claims, and drawings of the prior application are incorporated herein by reference in their entirety and are considered part of the scope of this application. Technical Field

[0002] This application relates to the field of daily necessities technology, and in particular to a headrest. Background Technology

[0003] With the fast pace of modern life and increasing work pressure, people are paying more and more attention to the importance of short breaks, especially office workers who sit for long periods of time. Lunch break has become a crucial time to relieve morning fatigue and restore energy. In response, headrests have been introduced to the market for use during lunch breaks. These headrests support the user's head, improving comfort during lunch breaks.

[0004] However, the headrests in these technologies have poor adjustability, making it difficult to adapt to different sitting postures and heights, thus affecting comfort and resulting in a poor user experience. Utility Model Content

[0005] Therefore, it is necessary to provide a headrest that is highly adjustable and can improve user comfort.

[0006] A headrest is provided, comprising:

[0007] First structural component;

[0008] The second structural component is used to support the user's head;

[0009] A rotating shaft is used to rotatably connect the first structural member to the second structural member; and

[0010] A locking assembly, a portion of which is disposed on the rotating shaft, and another portion of which is connected to the first structural member, the locking assembly being used to restrict relative rotation between the first structural member and the second structural member.

[0011] In one embodiment, the locking assembly includes a first limiting member, a second limiting member, and a rotating gear. The first limiting member is disposed on the first structural member, and the second limiting member is fixed relative to the second structural member. The first limiting member and the second limiting member are sequentially spaced along the axial direction of the rotating shaft. The rotating gear is disposed on the outer periphery of the rotating shaft, and at least a portion of the rotating gear meshes with the second limiting member. The rotating gear is capable of moving along the axial direction of the rotating shaft toward the first limiting member until it meshes with the first limiting member to restrict relative rotation between the first and second structural members, or moving relative to the rotating shaft away from the first limiting member until it separates from the first limiting member to release the restriction on the first and second structural members.

[0012] In one embodiment, the locking assembly includes a locking member and a locking block. The locking member is disposed on the outer periphery of the rotating shaft and is circumferentially fixed relative to the rotating shaft. At least a portion of the locking block is disposed on the first structural member. The locking block is located on one side of the locking member. The locking block can move along a predetermined straight line on the first structural member toward the locking member to engage with the locking member, thereby restricting relative rotation between the first structural member and the second structural member. The locking block can also move along the predetermined straight line on the first structural member away from the locking member to separate from the locking member, thereby releasing the restriction on the first structural member and the second structural member.

[0013] The locking element is a first one-way gear. When the locking block engages with the locking element, it prevents the locking element from rotating in the first direction relative to the locking block, thereby limiting the reduction of the included angle between the first structural member and the second structural member.

[0014] The locking block is provided with a biting surface and a guide surface, both of which are located at the end where the locking block and the locking member are biting. The biting surface can restrict the locking member from rotating relative to the locking block in the first direction, and the guide surface can guide the locking member to rotate relative to the locking block in the second direction, which is opposite to the first direction.

[0015] In one embodiment, the locking assembly includes a second one-way gear and a first locking gear, at least a portion of the first locking gear is disposed on the second structural member, the first locking gear is located on the outer periphery of the rotating shaft, the first locking gear and the second one-way gear are respectively distributed sequentially along the axial direction of the rotating shaft, and the second one-way gear is rotatable relative to the rotating shaft;

[0016] The axial movement of the rotating shaft can drive the first locking gear to move toward the second one-way gear until the first locking gear meshes with the second one-way gear, thereby restricting the rotation of the second one-way gear relative to the rotating shaft.

[0017] The axial movement of the rotating shaft can drive the first locking gear to move away from the second one-way gear until the first locking gear separates from the second one-way gear, thereby releasing the restriction on the second one-way gear;

[0018] The second one-way gear is rotatable relative to the shaft in a first direction or a second direction, the first direction being opposite to the second direction. When the first locking gear meshes with the second one-way gear, the first locking gear restricts the second one-way gear from rotating relative to the shaft in the first direction. When the first locking gear disengages from the second one-way gear, the first locking gear releases the restriction on the second one-way gear, allowing the second one-way gear to rotate relative to the shaft in the first direction or the second direction.

[0019] The locking assembly further includes a second pushing part, which is disposed at at least one end of the axial direction of the rotating shaft, and at least a portion of the second pushing part is exposed outside the first structural member.

[0020] In one embodiment, the first structural member includes a first split, a second split, and a first locking component. The first split and the second split are slidably connected to each other so that the length of the first structural member is adjustable. The first locking component includes a first locking member and a fourth elastic member. The first locking member is connected to the second split through the fourth elastic member. The first split has at least two locking holes, which are distributed at intervals along the relative sliding direction of the first split and the second split. The fourth elastic member has a tendency to drive the first locking member toward the locking hole so that the first locking member can be locked in either locking hole, thereby locking the relative position of the first split and the second split. When the first locking member is locked in the locking hole, a portion of the first locking member is exposed outside the first split for operation.

[0021] In one embodiment, the first structural member includes a first split, a second split, and a second locking component. The second split is slidably connected to the first split to make the length of the first structural member adjustable. The second locking component includes a second locking member, a locking block, and a fifth elastic member. The second locking member is disposed on the second split and has a plurality of first engaging portions. The plurality of first engaging portions are distributed sequentially at intervals along the relative sliding direction between the first split and the second split. The locking block is disposed on the first split. The fifth elastic member is used to apply a preload force to the locking block in a direction closer to the second locking member so that the locking block can engage with any of the first engaging portions to lock the first split and the second split. The locking block can move away from the second locking member until it disengages from the second locking member to release the locking of the first split and the second split.

[0022] The second locking member is provided with a plurality of locking teeth, which are distributed sequentially at intervals along the relative sliding direction between the first part and the second part, and the locking teeth form the first engagement part.

[0023] In one embodiment, the first structural member includes a first split body, a second split body, and a third locking component. The first split body and the second split body are slidably connected to each other, so that the length of the first structural member is adjustable. The third locking component includes a first locking member and a second locking member. The first locking member is disposed on the first split body, and the second locking member is disposed on the second split body. The first locking member has at least two engaging recesses, which are sequentially spaced along the relative sliding direction of the first split body and the second split body. The second locking member includes a fixed base, a second sliding member, and a positioning protrusion. The fixed base is connected to the second split body, and the second sliding member slides against the fixed base. The first locking member is disposed on one side of the fixed base, and the positioning protrusion is movably disposed on the second sliding member and can be inserted into any of the snap-fit ​​recesses. The positioning protrusion has a first state and a second state. In the first state, at least a portion of the positioning protrusion is exposed on the side of the fixed base facing the first locking member and inserted into the snap-fit ​​recess. In the second state, the positioning protrusion retracts into the fixed base and disengages from the snap-fit ​​recess. The positioning protrusion can move with the second sliding member, so that the positioning protrusion switches between the first state and the second state to be inserted into different snap-fit ​​recesses.

[0024] The fixing seat has a positioning hole on the side opposite to the first locking member. When the positioning protrusion is in the first state, a portion of the positioning protrusion passes through the positioning hole and protrudes from the side of the fixing seat facing the first locking member. When the positioning protrusion is in the second state, the positioning protrusion disengages from the positioning hole and retracts into the fixing seat.

[0025] The second sliding member includes a sliding body and a push-in part and a push-out part, both connected to the sliding body. The sliding body is slidably connected to the fixed base. The push-in part is used to push the positioning protrusion into the positioning hole, and the push-out part is used to push the positioning protrusion to keep the positioning protrusion in the first state.

[0026] The first locking member is an elastic body, and the first locking member always has the tendency to drive the positioning protrusion toward the fixed seat so that the positioning protrusion disengages from the positioning hole.

[0027] The sliding body is also provided with a clearance recess located at one end of the push-in portion away from the push-top. When the push-top disengages from the positioning protrusion, the positioning protrusion can move to the clearance recess.

[0028] In one embodiment, when the second structural member is placed on the placement member, the second structural member includes a base and a second seat body. The base is placed on the placement member, and the second seat body is connected to the first structural member. The second seat body is disposed on the base and rotatably connected to the base, so that the second seat body can rotate relative to the base about its own axis. When the second seat body rotates relative to the base, it can drive the first structural member to rotate relative to the base.

[0029] The second structural component also includes an adapter. The second main body has a hole structure adapted to the adapter at one end near the base. The center line of the hole structure and the axis of the adapter are both coincident with the axis of the second main body. One end of the adapter is connected to the base, and the other end is movably disposed in the hole structure. The second main body can rotate relative to the adapter around its own axis.

[0030] The second main body includes a support frame and a chassis frame. The support frame and the base are respectively disposed on opposite sides of the chassis frame. The chassis frame is provided with the hole structure through it, and the chassis frame can rotate relative to the adapter.

[0031] The adapter includes an adapter body and a protrusion on one end of the adapter body. The adapter body is movably passed through the hole structure, and the end of the adapter body away from the protrusion is connected to the base. The protrusion protrudes out of the outside of the adapter body and abuts against the side of the chassis frame facing away from the base, so as to prevent the adapter from separating from the chassis frame.

[0032] The second structural component further includes a third limiting component, which is disposed on the base. The second main body has multiple locking positions, which are distributed sequentially at intervals around the axis of the second main body. The third limiting component can be locked into any of the locking positions.

[0033] The aforementioned headrest features a second structural component rotatably connected to the first structural component via a pivot, allowing the second component to rotate relative to the first. This adjustment of the angle between the second and first structural components allows for better adaptation to the user's head posture, enhancing the headrest's adjustability and improving user comfort. After adjusting the angle between the second and first structural components, a locking mechanism restricts their relative rotation, locking their relative positions and preventing the angle between the two components from unexpectedly decreasing during use. Attached Figure Description

[0034] Figure 1 This is a perspective view of the headrest in some embodiments of this application (the headrest is in a folded state).

[0035] Figure 2 This is a perspective view of the headrest in some embodiments of this application (the headrest is in the open state).

[0036] Figure 3 for Figure 1 The headrest shown is a cross-sectional view.

[0037] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0038] Figure 5 This is a structural diagram of the first structural member, rotating member, and locking assembly in the first embodiment of this application.

[0039] Figure 6 This is an exploded view of the first structural member, rotating member, and locking assembly in the first embodiment of this application.

[0040] Figure 7 for Figure 6 A magnified view of a section at point B.

[0041] Figure 8 This is a perspective view of the pusher in the first embodiment of this application.

[0042] Figure 9 This is a perspective view of the headrest in another embodiment of this application (the headrest is in a folded state).

[0043] Figure 10 for Figure 9 The headrest shown is a cross-sectional view.

[0044] Figure 11 for Figure 10 A magnified view of a section at point C.

[0045] Figure 12 This is a structural diagram of the first structural member, rotating member, and locking assembly in the second embodiment of this application.

[0046] Figure 13 This is a first exploded view of the first structural member, rotating member, and locking assembly in the second embodiment of this application.

[0047] Figure 14 This is a second exploded view of the first structural member, rotating member, and locking assembly in the second embodiment of this application.

[0048] Figure 15 This is a cross-sectional view of the first structural member, rotating member, and locking assembly in the second embodiment of this application.

[0049] Figure 16 for Figure 15 A magnified view of a section at point D.

[0050] Figure 17 This is a perspective view of the control component in the second embodiment of this application.

[0051] Figure 18 This is a schematic diagram of the gear transmission structure in the second embodiment of this application.

[0052] Figure 19 This is a structural diagram of the first structural member, the rotating member, and the locking assembly in the third embodiment of this application.

[0053] Figure 20 This is an exploded view of the first structural member, rotating member, and locking assembly in the third embodiment of this application.

[0054] Figure 21 for Figure 20 A perspective view of the connecting block of the rotating component shown.

[0055] Figure 22 This is a structural diagram of the first structural member, the rotating member, and the locking assembly in the fourth embodiment of this application.

[0056] Figure 23 This is an exploded view of the first structural member, rotating member, and locking assembly in the fourth embodiment of this application.

[0057] Figure 24 This is a cross-sectional view of the first structural member, rotating member, and locking assembly in the fourth embodiment of this application.

[0058] Figure 25 This is a three-dimensional view of the first structural member and the rotating member in the fifth embodiment of this application.

[0059] Figure 26 This is a first exploded view of the first structural member and the rotating member in the fifth embodiment of this application.

[0060] Figure 27 This is a second exploded view of the first structural member and the rotating member in the fifth embodiment of this application.

[0061] Figure 28 for Figure 27 A magnified view of a section at point E in the middle.

[0062] Figure 29 This is a cross-sectional view of the first structural member and the rotating member in the fifth embodiment of this application.

[0063] Figure 30 for Figure 29 A magnified view of a section at point F.

[0064] Figure 31 This is a perspective view of the first locking component in the fifth embodiment of this application.

[0065] Figure 32 This is a schematic diagram showing the connection between the fourth elastic member, the first sliding member, the first locking member, and the second split in the fifth embodiment of this application.

[0066] Figure 33 This is a perspective view of the first structural member and the rotating member in the sixth embodiment of this application.

[0067] Figure 34 This is a first exploded view of the first structural member and the rotating member in the sixth embodiment of this application.

[0068] Figure 35 This is a second exploded view of the first structural member and the rotating member in the sixth embodiment of this application.

[0069] Figure 36 This is a third exploded view of the first structural member and the rotating member in the sixth embodiment of this application.

[0070] Figure 37 This is a structural diagram of the second component in the sixth embodiment of this application.

[0071] Figure 38This is a perspective view of the limiting seat and the first locking block at an angle in the sixth embodiment of this application.

[0072] Figure 39 This is a perspective view of the limiting seat and the first locking block from another angle in the sixth embodiment of this application.

[0073] Figure 40 This is a cross-sectional view of the limiting seat, the first locking block, the second locking member, and the second split body in the sixth embodiment of this application (when the first locking block and the second locking member are engaged).

[0074] Figure 41 This is a three-dimensional structural diagram of the first structural member in the seventh embodiment of this application (rotating members are connected to both ends of the first structural member along its length).

[0075] Figure 42 This is a three-dimensional structural diagram of the first split body and the first locking member in the seventh embodiment of this application (one end of the first split body in the length direction is connected to a rotating member).

[0076] Figure 43 This is a three-dimensional structural diagram of the second part and the second locking member in the seventh embodiment of this application (one end of the second part in the length direction is connected to a rotating member).

[0077] Figure 44 This is a structural diagram of the second part and the second locking member at an angle after the groove sidewall of the second groove is removed in the seventh embodiment of this application.

[0078] Figure 45 This is a structural diagram of the second split and the second locking member from another angle after the groove sidewall of the second groove is removed in the seventh embodiment of this application.

[0079] Figure 46 This is a perspective view of a second structural member for placement on a placement member in some embodiments of this application.

[0080] Figure 47 for Figure 46 An exploded view of the second structural component is shown.

[0081] Figure 48 for Figure 46 The diagram shows the structure of the chassis frame.

[0082] Figure 49 for Figure 48 A magnified view of a section at point G.

[0083] Figure 50 This is a structural diagram of the base and the third limiting member in some embodiments of this application.

[0084] Figure 51 for Figure 50 A magnified view of a section at point H.

[0085] Figure 52 This is a perspective view of an adapter according to some embodiments of this application.

[0086] Figure 53 Distribution diagram of the fourth positioning post on the substrate in some embodiments of this application.

[0087] Figure 54 This is a schematic diagram of the structure of the fourth positioning post passing through the second positioning groove on the second main body in some embodiments of this application.

[0088] Figure 55 This is a perspective view of the headrest in some embodiments of this application (when the headrest is in the open state).

[0089] Figure 56 for Figure 55 The headrest shown is a 3D view (when the headrest is in the folded-out state). Detailed Implementation

[0090] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0091] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0092] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0094] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0095] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0096] See Figures 1 to 3 , Figure 1 A perspective view of a headrest (in a folded state) is shown in some embodiments of this application. Figure 2 A perspective view of the headrest (in the open state) is shown in some embodiments of this application. Figure 3 for Figure 1The image shows a cross-sectional view of the headrest. One embodiment of this application provides a headrest including a first structural member 100, a second structural member 200, a pivot 301, and a locking assembly 400. The first structural member 100 is a support member of the headrest, used to support the second structural member 200. The second structural member 200 is a headrest member of the headrest, used to support the user's head. The first structural member 100 is rotatably connected to the second structural member 200 via the pivot 301. A portion of the locking assembly 400 is disposed on the pivot 301, and another portion of the locking assembly 400 is connected to the first structural member 100. The locking assembly 400 is used to restrict the relative rotation between the first structural member 100 and the second structural member 200. The second structural component 200 is rotatably connected to the first structural component 100 via a pivot 301, allowing the second structural component 200 to rotate relative to the first structural component 100. This allows adjustment of the angle between the second and first structural components, thus adjusting the tilt angle of the second structural component 200 to better adapt to the user's head posture and improve user comfort. After adjusting the angle between the second and first structural components 200, a locking assembly 400 restricts the relative rotation of the two components, locking their relative positions and preventing the angle between them from unexpectedly decreasing during use.

[0097] In some embodiments of the headrest, two second structural members 200 and two rotating shafts 301 are provided. One second structural member 200 is a support member of the headrest, used to support the user's head; the other second structural member 200 is a base of the headrest, used to place it on a placement object (such as a table). Two sets of locking assemblies 400 are provided, each corresponding to one of the two second structural members 200 and one of the two rotating shafts 301. A portion of the locking assembly 400 is connected to the corresponding rotating shaft 301. The two ends of the first structural member 100 in the length direction are rotatably connected to the two second structural members 200 respectively through the two rotating shafts 301. The two sets of locking assemblies 400 are respectively provided at the two ends of the first structural member 100 with the second structural members 200, and the locking assemblies 400 can restrict the relative rotation of the first structural member 100 and the corresponding second structural member 200.

[0098] In the aforementioned headrest, the locking components 400 at both ends of the first structural member 100 are independent of each other. Each locking component 400 can respectively restrict the relative rotation of the two second structural members 200 with respect to the first structural member 100. When the two sets of locking components 400 release the relative rotation of the two second structural members 200 with respect to the first structural member 100, both second structural members 200 can rotate relative to the first structural member 100. This allows the angle between the two second structural members 200 and the first structural member 100 to be adjusted, enabling the two second structural members 200 to fit against opposite sides of the first structural member 100, thus achieving folding of the headrest for easy storage and transportation. When the headrest is needed, the angle between the two second structural members 200 and the first structural member 100 is increased respectively. After the two second structural members 200 are opened to the appropriate positions, the locking component 400 limits the angle between the two second structural members 200 and the first structural member 100, locking the relative positions of the two second structural members 200 and the first structural member 100, keeping the headrest in the open state and ensuring normal use. Furthermore, by adjusting the angle between the second structural member 200 and the first structural member 100 (which is placed on the placement piece), the tilt angle of the first structural member 100 can be adjusted, thereby adjusting the overall height of the first structural member 100. This allows adjustment of the height of the second structural member 200 that supports the user's head, making the headrest suitable for users of different heights.

[0099] It should be noted that in other embodiments, the headrest may also have only one second structural member 200. In the case of one second structural member 200, the second structural member 200 serves as the headrest, supporting the user's head. That is, the headrest may not include a base; instead, it may be fixed to the placement component by providing suction cups or head clamps on the first structural member 100. In actual implementation, the number of second structural members 200 can be set to one or two as needed. In the case of two second structural members 200, one second structural member 200 serves as the headrest, supporting the user's head, while the other second structural member 200 serves as the base, placed on the placement component.

[0100] Combination Figure 4 The headrest also includes a rotating component 300. The rotating component 300 is connected between the first structural component 100 and the second structural component 200. The rotating component 300 includes a connecting block 302 and a rotating shaft 301. The rotating shaft 301 passes through the connecting block 302, and the connecting block 302 is fixed to the second structural component 200.

[0101] When the headrest is provided with two second structural members 200, two rotating members 300 are also provided. Each rotating member 300 includes a rotating shaft 301 and a connecting block 302. The two rotating members 300 correspond one-to-one with the two second structural members 200. The connecting block 302 is connected to the corresponding second structural member 200 so that the connecting block 302 is fixed on the corresponding second structural member 200.

[0102] In some embodiments, see Figures 3 to 6 The headrest locking assembly 400 includes a first limiting member 1, a second limiting member 2, and a rotating gear 3. The first limiting member 1 is disposed on the first structural member 100, and the second limiting member 2 is fixed relative to the second structural member 200. In this embodiment, the second limiting member 2 is fixed relative to the second structural member 200 through the connecting block 302 of the rotating member 300. The first limiting member 1 and the second limiting member 2 are distributed sequentially at intervals along the axial direction of the rotating shaft 301. The rotating gear 3 is disposed on the outer periphery of the rotating shaft 301, and at least a portion of the rotating gear 3 meshes with the second limiting member 2. The rotating gear 3 can move relative to the rotating shaft 301 towards the first limiting member 1 along the axial direction of the rotating shaft 301 until it meshes with the first limiting member 1 to restrict the relative rotation of the first structural member 100 and the second structural member 200, or move relative to the rotating shaft 301 away from the first limiting member 1 until it separates from the first limiting member 1 to release the restriction on the first structural member 100 and the second structural member 200.

[0103] Since at least a portion of the rotating gear 3 meshes with the second limiting member 2, when the rotating gear 3 moves along the axial direction of the rotating shaft 301 towards the first limiting member 1, the rotating gear 3 can mesh with the first limiting member 1, causing the rotating gear 3 to simultaneously mesh with the first limiting member 1 and the second limiting member 2. Under the cooperation of the first limiting member 1 and the second limiting member 2, the rotating gear 3 is locked, preventing it from rotating relative to the first limiting member 1 and the second limiting member 2, thereby preventing the first structural member 100 from rotating relative to the second structural member 200. Thus, the purpose of restricting the relative rotation of the first structural member 100 and the second structural member 200 is achieved. When the rotating gear 3 moves away from the first limiting member 1 along the axial direction of the rotating shaft 301 until the rotating gear 3 separates from the first limiting member 1, the rotating gear 3 only engages with the second limiting member 2. The first structural member 100 can rotate relative to the second structural member 200, thereby adjusting the included angle α between the first structural member 100 and the second structural member 200. Thus, the tilt angle of the second structural member 200 can be adjusted as needed. This locking assembly 400 has a simple structure, and by moving the rotating gear 3 along the axial direction of the rotating shaft 301 relative to the rotating shaft 301, one end of the rotating gear 3 can engage with the first limiting member 1, facilitating the restriction of the rotation of the first structural member 100 relative to the second structural member 200, thereby locking the relative position between the first structural member 100 and the second structural member 200. Operation is simple.

[0104] In this type of headrest, when the rotating gear 3 of the locking assembly 400 is separated from the first limiting member 1, the first structural member 100 and the second structural member 200 can rotate relative to each other, allowing adjustment of the included angle between the second structural member 200 and the first structural member 100. In actual use, by adjusting the included angle between the second structural member 200 and the first structural member 100, the tilt angle of the second structural member 200 can be adjusted to meet the user's needs. After adjusting the included angle between the second structural member 200 and the first structural member 100, the rotating gear 3 of the locking assembly 400 is driven to move towards the first limiting member 1, so that both ends of the rotating gear 3 mesh with the first limiting member 1 and the second limiting member 2 respectively. Under the mutual cooperation of the first limiting member 1 and the second limiting member 2, the rotating gear 3 is locked, thereby restricting the relative rotation of the first structural member 100 and the second structural member 200. In this way, the relative position between the second structural member 200 and the first structural member 100 is fixed, preventing the included angle between the second structural member 200 and the first structural member 100 from decreasing due to accidents, thus ensuring the normal use of the headrest.

[0105] In one example, the first limiting member 1 is an internal spline, and the second limiting member 2 is an internal spline. The internal spline structure has the advantages of being easy to process and being able to lock stably when engaged with the rotating gear 3.

[0106] In another example, the first limiting member 1 is an internal gear, and the second limiting member 2 is an internal gear. Alternatively, the first limiting member 1 is an internal spline, and the second limiting member 2 is an internal gear; or the first limiting member 1 is an internal gear, and the second limiting member 2 is an internal spline.

[0107] Of course, in other examples, at least one of the first limiting member 1 and the second limiting member 2 can be set to other structures. For example, the first limiting member 1 and the second limiting member 2 can both be set to external gear structures, or the first limiting member 1 and the second limiting member 2 can both be set to rack structures.

[0108] When both the first limiting member 1 and the second limiting member 2 are external gear structures, the rotating gear 3 is an internal gear. Both the first limiting member 1 and the second limiting member 2 include an external gear and a gear sleeve fixed to the external gear. The external gear of the first limiting member 1 is disposed on the outer periphery of the gear sleeve of the first limiting member 1, and the external gear of the second limiting member 2 is disposed on the outer periphery of the gear sleeve of the second limiting member 2. The gear sleeve in the first limiting member 1 is fixed to the first structural member 100 and sleeved on the outer periphery of the rotating shaft 301, allowing the gear sleeve of the first limiting member 1 to rotate relative to the rotating shaft 301. The gear sleeve of the second limiting member 2 is fixed to the second structural member 200 and sleeved on the outer periphery of the rotating shaft 301. One axial end of the rotating gear 3 is sleeved on the outer periphery of the external gear of the second limiting member 2 and meshes with the external gear of the second limiting member 2. The other axial end of the rotating gear 3 can be sleeved on the outer periphery of the external gear of the second limiting member 2 and meshes with the external gear of the second limiting member 2, or it can be separated from the external gear of the second limiting member 2. When the rotating gear 3 moves along the axial direction of the rotating shaft 301 toward the direction closer to the first limiting member 1 until it is sleeved on the outer circumference of the outer gear of the first limiting member 1 and meshes with the outer gear of the first limiting member 1, at this time, the rotating gear 3 is meshed with the outer gear of the first limiting member 1 and the outer gear of the second limiting member 2. Under the cooperation of the first limiting member 1 and the second limiting member 2, the rotating gear 3 is locked, thereby restricting the relative rotation of the first structural member 100 and the second structural member 200. When the rotating gear 3 moves along the axial direction of the rotating shaft 301 away from the first limiting member 1 until it is separated from the first limiting member 1, at this time, the rotating gear 3 only meshes with the outer gear of the second limiting member 2, releasing the restriction on the first structural member 100 and the second structural member 200.

[0109] When both the first limiting member 1 and the second limiting member 2 are rack structures, both the first limiting member 1 and the second limiting member 2 are arc-shaped racks, and the arc centers of the first limiting member 1 and the second limiting member 2 are both located on the axis of the rotating shaft 301. The rotating gear 3 is an internal gear, and one end of the rotating gear 3 meshes with the second limiting member 2. When the rotating gear 3 moves along the axial direction of the rotating shaft 301 toward the first limiting member 1, the end of the rotating gear 3 away from the second limiting member 2 is sleeved on the outer periphery of the first limiting member 1 and meshes with the first limiting member 1, thereby restricting the relative rotation of the first structural member 100 and the second structural member 200. When the rotating gear 3 moves along the axial direction of the rotating shaft 301 toward the direction away from the first limiting member 1, the rotating gear 3 separates from the first limiting member 1, thereby releasing the restriction on the first structural member 100 and the second structural member 200.

[0110] In actual implementation, the type of rotating gear 3 can be flexibly adjusted according to the specific structure of the first limiting member 1 and the second limiting member 2. For example, the rotating gear 3 can be set as an external gear so that the rotating gear 3, the first limiting member 1 and the second limiting member 2 can cooperate with each other to restrict the relative rotation of the first structural member 100 and the second structural member 200 or to release the restriction on the first structural member 100 or the second structural member 200. Specific implementation methods for the specific structure of the first limiting member 1 and the second limiting member 2 are not listed here.

[0111] When a rotating member 300 is connected between the first structural member 100 and the second structural member 200, the second limiting member 2 is disposed inside the connecting block 302 in the rotating member 300. The placement of the connecting block 302 provides space for the arrangement of the second limiting member 2, which is beneficial for the installation of the second limiting member 2.

[0112] To more conveniently restrict the relative rotation of the first structural member 100 and the second structural member 200, the locking assembly 400 also includes a first elastic member 4. The first elastic member 4 is disposed on the connecting block 302 and connected to the rotating gear 3. The first elastic member 4 always has the tendency to drive the rotating gear 3 to move along the axial direction of the rotating shaft 301 towards the first limiting member 1. When the headrest is in use, an external force pushes the rotating gear 3 to move away from the first limiting member 1, causing the rotating gear 3 to separate from the first limiting member 1, allowing the first structural member 100 to rotate relative to the second structural member 200. After the second structural member 200 is adjusted into position, the external force is removed. Under the elastic action of the first elastic member 4, the first elastic member 4 drives the rotating gear 3 to move towards the first limiting member 1 and engage with the first limiting member 1, thereby automatically restricting the relative rotation of the first structural member 100 and the second structural member 200.

[0113] In this example, the first elastic element 4 is a compression spring, but it is not limited to this. The first elastic element 4 can also be an elastic sheet or other structures.

[0114] In one example, combined Figure 6 The connecting block 302 includes a seat 3021 and a bushing 3022 disposed on the seat 3021. The seat 3021 is fixed to the second structural member 200. The rotating shaft 301 passes through the bushing 3022. The seat 3021 is provided with a mounting groove surrounding the bushing 3022. The opening of the mounting groove faces the first limiting member 1. A second limiting member 2 is disposed on the inner side wall of the mounting groove. The rotating gear 3 is sleeved on the outer circumference of the bushing 3022 and meshes with the second limiting member 2 in the mounting groove. A first elastic member 4 is sleeved on the outer circumference of the bushing 3022 and is connected between the bottom of the mounting groove and the rotating gear 3. It should be noted that, in this application, the bottom of the mounting groove refers to the part of the mounting groove wall opposite to the opening of the mounting groove.

[0115] To facilitate the separation of the rotating gear 3 from the first limiting member 1, the locking assembly 400 further includes a pushing member 5. The pushing member 5 is located on the side of the first limiting member 1 opposite to the rotating gear 3, and the pushing member 5 is movable relative to the first limiting member 1 along the axial direction of the rotating shaft 301. When the pushing member 5 moves axially relative to the first limiting member 1, it can drive the rotating gear 3 to move away from the first limiting member 1, thereby separating the rotating gear 3 from the first limiting member 1.

[0116] In one example, combined Figure 5 and Figure 6 Two sets of locking assemblies 400 are provided at the same end of the first structural member 100. The two sets of locking assemblies 400 on the same end of the first structural member 100 are distributed sequentially at intervals along the axial direction of the same rotating shaft 301. The rotating gears 3 in the two sets of locking assemblies 400 on the same end of the first structural member 100 are all provided on the same rotating shaft 301, and the second limiting members 2 in the locking assemblies 400 on the same end of the first structural member 100 are all provided in the same connecting block 302. The first structural member 100 includes a structural body and two connecting structures, which are respectively provided at both ends of the length direction of the structural body. Each connecting structure includes two connecting parts 103, which are spaced apart along the width of the main body. Each connecting part 103 is provided with a mounting hole 1031. A first limiting member 1 is provided on the inner wall of the mounting hole 1031 facing the connecting block 302. The first limiting member 1 is located on the inner wall surrounding the mounting hole 1031. The two axial ends of the rotating shaft 301 are respectively provided in the mounting holes 1031 of the two connecting parts 103. Two sets of locking components 400 are provided at the same end of the first structural member 100. The two sets of locking components 400 can lock the relative position of the second structural member 200 and the first structural member 100, thereby increasing the locking force and improving the load-bearing capacity of the head support.

[0117] When the first structural member 100 includes a structural body and a connecting part 103, the pusher 5 is movably disposed in the mounting hole 1031 of the connecting part 103. This design, on the one hand, allows the pusher 5 to be at least partially accommodated in the mounting hole 1031, improving the structural compactness of the headrest; on the other hand, the pusher 5 can be guided by the side wall of the mounting hole 1031, improving the smoothness of the movement of the pusher 5.

[0118] Furthermore, the pushing member 5 includes a first pushing part 51 and a push rod 52 connected to the first pushing part 51. The push rod 52 is used to push the rotating gear 3. The push rod 52 is connected to the first pushing part 51 so that the push rod 52 and the first pushing part 51 move synchronously. Thus, when the user pushes the first pushing part 51 to move closer to the first limiting member 1, it drives the push rod 52 to push the rotating gear 3 away from the first limiting member 1, thereby separating the rotating gear 3 from the first limiting member 1.

[0119] In other alternative embodiments, the pusher 5 may be movably disposed on the first structural member 100, with a portion of the pusher 5 exposed outside the first structural member 100. The pusher 5 is connected to the rotating gear 3, so that the pusher 5 can be moved outside the first structural member 100 to control the rotating gear 3 to move closer to or away from the first limiting member 1. For example, the pusher 5 may be exposed on the top or bottom surface of the first structural member 100 in the thickness direction, or at any end of the first structural member 100 in the length direction. It is understood that the pusher 5 may be connected to one side of the rotating gear 3 axially or radially, and the specific location of the connection between the pusher 5 and the rotating gear 3 is not limited herein.

[0120] This application does not limit the specific structure and location of the pusher 5. It should be understood that, without creative effort, any technical solution that uses other simple transmission mechanisms to make the rotating gear 3 move linearly along its axis, thereby engaging or disengaging with the first limiting member 1, should fall within the protection scope of this application.

[0121] See Figures 6 to 8The locking assembly 400 also includes a connecting member 6. The connecting member 6 is located on the side of the first limiting member 1 away from the rotating gear 3. The connecting member 6 has a connecting hole 61 and a guide hole 62. The rotating shaft 301 passes through the connecting hole 61 and is rotatably connected to the connecting member 6. The end of the push rod 52 away from the first pushing part 51 passes through the guide hole 62 and protrudes from the side of the connecting member 6 facing the first limiting member 1. In actual implementation, the connecting member 6 is located in the mounting hole 1031 of the first structural member 100, and is positioned between the first limiting member 1 and the first pushing part 51. When the included angle α between the first structural member 100 and the second structural member 200 is adjusted, the connecting member 6 can rotate relative to the rotating shaft 301. When the end of the push rod 52 away from the first pushing part 51 passes through the guide hole 62, the push rod 52 can be guided by the hole wall of the guide hole 62 when an external force drives the pushing member 5 to move, further improving the smoothness of the movement of the pushing member 5.

[0122] In one example, there are multiple push rods 52, which are spaced apart around the center line of the first pushing part 51, and the center line of the first pushing part 51 coincides with the axis of the rotating shaft 301. There are multiple guide holes 62, and each push rod 52 corresponds to a guide hole 62, with the push rod 52 passing through its corresponding guide hole 62. By having multiple push rods 52 spaced apart around the center line of the first pushing part 51 simultaneously push the rotating gear 3, the thrust on the rotating gear 3 is evenly distributed, reducing the risk of the rotating gear 3 tilting due to uneven force and causing it to jam during movement.

[0123] In this example, there are four push rods 52. Of course, in other examples, the number of push rods 52 can be set to one, two, or three, etc., and there is no specific limitation on the number of push rods 52 here.

[0124] To prevent the connecting piece 6 from detaching from the rotating shaft 301, the rotating shaft 301 includes a shaft body 3011 and a first limiting block 3014 connected to the shaft body 3011. The first limiting block 3014 is disposed at one axial end of the shaft body 3011. The rotating gear 3 and the connecting piece 6 are sequentially passed through the shaft body 3011. The first limiting block 3014 is located on the side of the connecting piece 6 facing away from the first limiting piece 1. The first limiting block 3014 can prevent the connecting piece 6 from falling off from the axial end of the rotating shaft 301.

[0125] Furthermore, combined Figure 8The push rod 52 includes a rod body 521 and a second limiting block 522 connected to the rod body 521. The second limiting block 522 protrudes from the outside of the rod body 521 and can abut against the side of the connecting member 6 facing the first limiting member 1 to prevent the push rod 52 from disengaging from the connecting member 6. The portion of the rod body 521 located between the first pushing part 51 and the second limiting block 522 can move in the guide hole 62. Because the second limiting block 522 protrudes from the outside of the rod body 521, the size of the push rod 52 at the second limiting block 522 is too large to pass through the guide hole 62. Therefore, the second limiting block 522 can abut against the side of the connecting member 6 facing the first limiting member 1 to prevent the push rod 52 from disengaging from the connecting member 6, thereby preventing the pushing member 5 from falling off the first structural member 100.

[0126] In order to improve the structural compactness of the locking assembly 400, the connecting member 6 is recessed on the side facing the first limiting member 1, and the recessed part 63 is located at the opening end of the guide hole 62. When the second limiting block 522 abuts against the connecting member 6, the second limiting block 522 can be accommodated by the recessed part 63.

[0127] In actual implementation, when there are multiple push rods 52, a second limiting block 522 can be set on some of the push rods 52 to reduce the material used for the pusher 5. In this example, there are four push rods 52, two of which are equipped with the second limiting block 522, and the other two push rods are not equipped with the second limiting block 522.

[0128] In other embodiments, see Figures 9 to 13 The headrest locking assembly 400 includes a locking member 7 and a locking block 8. The locking member 7 is disposed on the outer periphery of the rotating shaft 301 and is fixed circumferentially relative to the rotating shaft 301. In this example, the locking member 7 is arranged in a ring around the outer periphery of the rotating shaft 301. In other examples, the locking member 7 may be arranged in a semi-ring around the outer periphery of the rotating shaft 301. The specific arrangement of the locking member 7 on the outer periphery of the rotating shaft 301 is not limited here. At least a portion of the locking block 8 is disposed on the first structural member 100. The locking block 8 is located on one side of the locking member 7. The locking block 8 can move along a set straight line on the first structural member 100 toward the locking member 7 to engage with the locking member 7, thereby restricting the relative rotation between the first structural member 100 and the second structural member 200. The locking block 8 can move along a set straight line on the first structural member 100 in a direction away from the locking member 7 to separate the locking block 8 from the locking member 7, thereby releasing the restriction on the first structural member 100 and the second structural member 200.

[0129] The first structural member 100 is rotatably connected to the second structural member 200 via a rotating shaft 301. Since the locking member 7 is located on the outer periphery of the rotating shaft 301 and is circumferentially fixed relative to the rotating shaft 301, when the locking block 8 on the first structural member 100 engages with the locking member 7, it can restrict the rotation of the first structural member 100 relative to the second structural member 200, thereby locking the relative positions of the first structural member 100 and the second structural member 200. Figure 2 When it is necessary to adjust the included angle α between the first structural member 100 and the second structural member 200, the locking block 8 moves along a set straight line on the first structural member 100 in a direction away from the locking member 7 until the locking block 8 separates from the locking member 7, thereby releasing the restriction on the first structural member 100 and the second structural member 200.

[0130] In this type of locking assembly 400, the locking block 8 moves along a set straight line on the first structural member 100 towards the locking member, causing the locking block 8 to engage with the locking member 7 to restrict the relative rotation of the first structural member 100 and the second structural member 200. The locking block 8 also moves along a set straight line away from the locking member 7 on the first structural member 100, causing the locking block 8 to separate from the locking member 7, thus releasing the restriction on the first structural member 100 and the second structural member 200. Through the cooperation of the locking block 8 and the locking member 7, the relative positions of the first structural member 100 and the second structural member 200 can be quickly locked. Furthermore, the machining accuracy requirements for the locking block 8 and the locking member 7 are low, which helps reduce the machining difficulty of the locking assembly 400, facilitates adjustment of the included angle α between the first structural member 100 and the second structural member 200, and makes user operation convenient.

[0131] It can be explained that the set line is parallel to the line where the locking block 8 points to the locking member 7.

[0132] In one example, the locking element 7 is a first one-way gear. When the locking block 8 engages with the locking element 7, the locking block 8 prevents the locking element 7 from rotating relative to it in the first direction, thereby limiting the reduction of the included angle α between the first structural member 100 and the second structural member 200. Thus, when the locking block 8 and the locking element 7 are engaged, the locking element 7 cannot rotate in the first direction but can only rotate in the second direction. At this time, the included angle α between the first structural member 100 and the second structural member 200 cannot be decreased; it can only be increased. Therefore, when the locking block 8 and the locking element 7 are engaged, the user can increase the included angle α between the first structural member 100 and the second structural member 200 as needed. Through the one-way locking of the locking element 7 by the locking block 8, once adjusted to the correct position, the angle α between the first structural member 100 and the second structural member 200 is prevented from unexpectedly decreasing and affecting the normal use of the headrest.

[0133] It should be noted that in this embodiment, when the locking member 7 rotates relative to the locking block 8 in the first direction, the included angle α between the first structural member 100 and the second structural member 200 decreases, that is, the first direction is the direction indicated by the arrow Y1 in the figure.

[0134] Of course, in other examples, the locking element 7 can also be set as a two-way gear. When the locking element 7 is a two-way gear, when the locking block 8 engages with the locking element 7, it prevents the locking element 7 from rotating in the first direction and the second direction, thereby achieving two-way locking. At this time, the first structural member 100 and the second structural member 200 cannot rotate relative to each other.

[0135] It can be explained that the second direction is opposite to the first direction. When the locking member 7 rotates in the second direction, the included angle α between the first structural member 100 and the second structural member 200 increases. That is, the second direction is the direction indicated by the arrow X1 in the figure.

[0136] When the locking element 7 is the first one-way gear, combined with Figures 14 to 16 The locking block 8 is provided with a biting surface 81 and a guide surface 82. Both the biting surface 81 and the guide surface 82 are provided at the end where the locking block 8 and the locking member 7 are biting. The biting surface 81 can restrict the locking member 7 from rotating in a first direction relative to the locking block 8, and the guide surface 82 can guide the locking member 7 to rotate in a second direction relative to the locking block 8.

[0137] The locking member 7 includes multiple locking positions 73, which are spaced apart around the locking block 8. One end of the locking block 8 can be inserted into any of the locking positions 73 so that the locking block 8 can engage with the locking member 7. The multiple locking positions 73 can lock the first structural member 100 and the second structural member 200 in multiple positions, realizing the adjustment of the headrest in multiple positions.

[0138] In this example, there are seven locking teeth 72, and a locking position 73 is formed between two adjacent locking teeth 72. Therefore, there are six locking positions 73. In other examples, the number of locking positions 73 can be flexibly adjusted as needed, and there is no specific limit to the number of locking positions 73 here.

[0139] In one example, the locking member 7 further includes a first gear body 71 and a plurality of locking teeth 72 evenly distributed on the outer periphery of the first gear body 71. The first gear body 71 is connected to the rotating shaft 301. In this example, the axis of the first gear body 71 coincides with the axis of the rotating shaft 301. The locking teeth 72 are used to engage with the meshing surface 81 of the locking block 8. It should be noted that when the locking member 7 includes the first gear body 71, the axis of the locking member 7 is the axis of the first gear body 71. The plurality of locking teeth 72 are evenly and spaced around the axis of the first gear body 71, wherein the axis is defined as the axis of the first gear body 71. A locking position 73 is formed between two adjacent locking teeth 72. The total arc of the locking position 73 on the outer periphery of the first gear body 71 is β, where 0° < β ≤ 180°. The guide surface 82 is an inclined surface 2341. When the locking member 7 rotates in the second direction, the guide surface 82 guides the locking member 7 to slide past the locking block 8, preventing the locking member 7 from getting stuck. Setting 0°<β≤180° can accommodate a large adjustment range of the included angle between the first structural member 100 and the second structural member 200, meeting the user's needs.

[0140] It can be explained that the total distribution range of the locking position 73 on the outer periphery of the first gear body 71 refers to the radian of the angular range covered by all the locking positions 73 on the same locking member 7 in the circumferential direction.

[0141] Furthermore, the total distribution arc β of the locking gear teeth 72 on the first gear body 71 is 90°, so that the adjustment angle between the first structural member 100 and the second structural member 200 can be limited to 0°-90°.

[0142] Of course, in other examples, the total distribution arc β of the locking gear teeth 72 on the first gear body 71 can be flexibly adjusted as needed, for example, β can be adjusted to 120°, 250° or 180°, etc.

[0143] To reduce the risk of the locking block 8 scratching the locking element 7, a transition surface 83 is provided at the end where the locking block 8 and the locking element 7 engage. The transition surface 83 connects the engagement surface 81 and the guide surface 82. The transition surface 83 is an arc-shaped surface. By providing the transition surface 83 with an arc-shaped structure, the engagement surface 81 and the guide surface 82 can transition smoothly, avoiding sharp edges at the end where the locking block 8 and the locking element 7 engage.

[0144] When the locking element 7 is a first one-way gear, when the locking block 8 engages with the locking element 7, it restricts the locking element 7 from rotating in the first direction, thereby restricting the rotation of the first structural member 100 relative to the second structural member 200, preventing the included angle between the first structural member 100 and the second structural member 200 from decreasing, but not restricting the rotation of the first one-way gear in the second direction. In this headrest, when the locking block 8 engages with the first one-way gear, the included angle α between the first structural member 100 and the second structural member 200 can be increased, but cannot be decreased. In actual use, when the locking block 8 engages with the locking element 7, the included angle α between the first structural member 100 and the second structural member 200 can be increased as needed. After adjustment, no locking action is required, and the included angle α between the first structural member 100 and the second structural member 200 will not unexpectedly decrease, ensuring the normal use of the headrest.

[0145] When the first structural member 100 has a mounting hole 1031, the locking member 7 is disposed in the mounting hole 1031, and at least a portion of the locking block 8 is disposed inside the first structural member 100, allowing the locking block 8 to enter the mounting hole 1031 and engage with the locking member 7. In this way, at least a portion of the locking member 7 can be disposed inside the first structural member 100, improving the structural compactness between the first structural member 100, the rotating shaft 301, and the locking member 7.

[0146] When the first structural member 100 includes a structural body, a cavity is provided inside the structural body, and a first connecting hole 14 is provided between the structural body and the connecting part 103. The first connecting hole 14 connects the cavity and the mounting hole 1031. The locking block 8 is slidably disposed in the cavity of the structural body. When the locking block 8 moves along a set straight line toward the locking member 7, the end of the locking block 8 that engages with the locking member 7 passes through the first connecting hole 14 and enters the mounting hole 1031, so that the locking block 8 can engage with the locking member 7.

[0147] When two connecting portions 103 are provided at the same end of the first structural member 100, the same locking assembly 400 has two locking members 7 and two locking blocks 8. The locking members 7 and locking blocks 8 in the same locking assembly 400 correspond one-to-one, and the locking blocks 8 can engage with their corresponding locking blocks 8. The two locking members 7 in the same locking assembly 400 are respectively connected to the two axial ends of the rotating shaft 301. By providing two locking members 7 and two locking blocks 8 in the same locking assembly 400, and by the one-to-one engagement of the two locking blocks 8 with the two locking members 7, the restraining force on the second structural member 200 and the first structural member 100 can be enhanced, thus improving the reliability of the headrest.

[0148] In one example, combined Figure 11The headrest also includes a fixing component 13, which is used to fix the locking member 7 to the rotating shaft 301. The fixing component 13 includes a third limiting block 132 and a fixing member 131. The rotating shaft 301 includes a shaft body 3011 and an extension rod 3015 disposed at one axial end of the shaft body 3011. The axis of the shaft body 3011 coincides with the axis of the extension rod 3015. The connecting block 302 is disposed on the outer periphery of the shaft body 3011. A portion of the shaft body 3011 protrudes radially from the outer periphery of the extension rod 3015, forming a first step between the shaft body 3011 and the extension rod 3015. A third limiting block 132 is disposed at the end of the extension rod 3015 away from the shaft body 3011, and protrudes radially from the extension rod 3015. A second step is formed between the third limiting block 132 and the extension rod 3015. A locking member 7 is sleeved on the outer periphery of the extension rod 3015 and located between the first and second steps. The extension rod 3015 is provided with a first connecting hole, and the third limiting block 132 is provided with a second connecting hole, which communicates with the first connecting hole. One end of the fixing member 131 passes through the second connecting hole and is fixed in the first connecting hole, thereby limiting the locking member 7 on the rotating shaft 301. The fixing member 131 can be a screw, but is not limited to screws; it can also be a rivet, etc.

[0149] In this example, the extension rod 3015 is a square rod, and the locking member 7 is provided with a square hole that matches the square rod. The locking member 7 is sleeved on the outer periphery of the extension rod 3015 through the square hole, so as to achieve circumferential relative fixation between the locking member 7 and the rotating shaft 301.

[0150] Furthermore, combined Figure 13 and Figure 14 The first structural component 100 also includes a protective cover 105. The protective cover 105 is disposed on the side of the connecting portion 103 facing away from the connecting block 302. The protective cover 105 is used to cover the opening of the mounting hole 1031 at the end facing away from the connecting block 302, so that the locking member 7 is blocked inside the connecting portion 103, preventing foreign objects from entering the interior of the mounting hole 1031 and affecting the normal use of the locking member 7. In addition, the protective cover 105 can also improve the aesthetics of the first structural component 100.

[0151] It is understandable that the number of protective covers 105 is equal to the number of connecting parts 103, and the protective covers 105 correspond one-to-one with the connecting parts 103. The protective covers 105 are located on the side of the corresponding connecting part 103 that faces away from the connecting block 302.

[0152] Continue to combine Figure 13 and Figure 14The locking assembly 400 further includes a driving member 9, at least a portion of which is disposed within the first structural member 100. The driving member 9 is connected to the locking block 8 and is capable of driving the locking block 8 to move relative to the locking member 7. Driving the locking block 8 to move via the driving member 9 facilitates engagement or disengagement between the locking block 8 and the locking member 7. When the first structural member 100 includes a structural body, the driving member 9 is disposed within a cavity of the structural body.

[0153] To facilitate the movement of the drive member 9, the locking assembly 400 also includes a control member 12, at least a portion of which is exposed outside the first structural member 100. The control member 12 is connected to the drive member 9, and both the control member 12 and the drive member 9 can move relative to the first structural member 100. The control member 12 can drive the drive member 9 to move relative to the first structural member 100, thereby causing the drive member 9 to drive the locking block 8 to move.

[0154] In one example, the control member 12 is slidably connected to the first structural member 100 and can slide back and forth along a set straight line. Thus, by sliding the control member 12 along the set straight line, the locking block 8 can be driven by the driving member 9 to move back and forth along the set straight line, thereby causing the locking block 8 to engage or disengage from the locking member 7.

[0155] In another example, combined Figures 12 to 14 , Figure 15 and Figure 17 The locking block 8 always tends to move closer to the locking member 7 along a set straight line. In this case, the control member 12 includes a push block 121, a knob 123, and a connecting rod 122. The push block 121 is located inside the main body of the first structural member 100 and is rotatably connected to the main body. The knob 123 is located outside the main body of the first structural member 100. The connecting rod 122 connects the push block 121 and the knob 123. The push block 121 abuts against the driving member 9. The push block 121 is elongated. When the knob 123 is rotated, the push block 121 can be rotated inside the main body so that the length direction of the push block 121 can be parallel to the set straight line. Under normal conditions, the locking block 8 and the locking member 7 are engaged under the action of the driving member 9. When the knob 123 is rotated outside the first structural member 100 until the length direction of the pushing block 121 is parallel to the set straight line, one end of the pushing block 121 overcomes the preload of the driving member 9, causing the driving member 9 to move away from the locking block 8 along the set straight line, thereby driving the locking block 8 and the locking member 7 to separate through the driving member 9.

[0156] Combination Figures 12 to 16The locking assembly 400 also includes a second elastic element 10, which is connected to at least one of the locking block 8, the driving element 9, and the operating element 12. The second elastic element 10 always has a tendency to drive the locking block 8 to move along a predetermined straight line toward the locking element 7. In this example, the second elastic element 10 is connected to the driving element 9. A stiffening plate 104 is provided in the cavity of the main body of the structure, and the second elastic element 10 is connected to the driving element 9 and the stiffening plate 104 respectively. The second elastic element 10 has the ability to elastically deform. Since the second elastic element 10 always has the tendency to drive the locking block 8 to move along a set straight line towards the locking member 7, the locking block 8 and the locking member 7 remain engaged when no external force is applied to the locking block 8. When it is necessary to separate the locking block 8 from the locking member 7, the control element 12 applies an external force to the driving element 9, driving the driving element 9 to move away from the locking member 7, thereby moving the locking block 8 away from the locking member 7 until the locking block 8 and the locking member 7 are separated. When the external force is removed, under the elastic force of the second elastic element 10, the locking block 8 can automatically move along a set straight line towards the locking member 7, realizing the automatic engagement of the locking block 8 and the locking member 7. The setting of the second elastic element 10 can realize the automatic engagement of the locking block 8 and the locking member 7, which facilitates the operation of the locking assembly 400. In a feasible embodiment, the second elastic element 10 is a spring or an elastic sheet.

[0157] Furthermore, the locking assembly 400 also includes a first positioning post 11, which is connected to the driving member 9. A second elastic member 10 is sleeved on the outer periphery of the first positioning post 11, with the end of the second elastic member 10 away from the driving member 9 used to connect to the first structural member 100. The stiffening plate 104 is spaced apart from the driving member 9, and the first positioning post 11 is positioned between the stiffening plate 104 and the driving member 9. The second elastic member 10 is sleeved on the outer periphery of the first positioning post 11, and the first positioning post 11 positions the second elastic member 10 to prevent deviation of the moving path of the driving member 9.

[0158] Of course, in actual implementation, the second elastic element 10 can also be connected to the locking block 8 or the control element 12.

[0159] In one example, the driving member 9 is provided with a sliding hole 911. The length direction of the sliding hole 911 is parallel to the set straight line. A protruding rod is provided on the inner side wall of the main body of the structure (the protruding rod is not shown in the figure because it is blocked by the side wall of the main body of the structure). The protruding rod is slidably disposed in the sliding hole 911. In this way, when the driving member 9 moves back and forth along the set straight line, the protruding rod slides in the sliding hole 911, so that the locking block 8 can move along the set straight line on the first structural member 100 in a direction closer to or away from the locking member 7.

[0160] In another example, the locking assembly 400 also includes a lead screw (not shown in the figure) disposed inside the first structural member 100. In this example, the lead screw is disposed inside the main body of the structure, and the length direction of the lead screw is parallel to a set straight line. The locking block 8 is slidably connected to the inner wall of the main body of the structure, and the locking block 8 is provided with a threaded hole. The lead screw passes through the threaded hole and is threadedly connected to the inner wall of the threaded hole. Thus, when the lead screw rotates in the forward or reverse direction, it can drive the locking block 8 to reciprocate along the set straight line, thereby realizing the engagement or disengagement of the locking block 8 and the locking member 7.

[0161] In another example, combined Figure 18 Alternatively, the locking block 8 can be moved along a predetermined straight line on the first structural member 100 towards or away from the locking member 7 via a gear transmission structure. The gear transmission structure includes a transmission rack 15 and a transmission gear 16, both disposed inside the first structural member 100. The transmission rack 15 and transmission gear 16 are meshed together. The length direction of the transmission rack 15 is parallel to the predetermined straight line. The transmission gear 16 is rotatably connected to the first structural member 100, and the transmission rack 15 is fixed to the locking block 8. In the case where the first structural member 100 includes a main structural body, the transmission gear 16 is rotatably connected to the inner wall of the main structural body. In this example, the locking block 8 is located at the end of the transmission rack 15 near the locking member 7. The transmission gear 16 meshes with the transmission rack 15. When the transmission gear 16 rotates in the forward direction, it drives the locking block 8 to move along a set straight line towards the locking member 7, causing the locking block 8 to engage with the locking member 7. When the transmission gear 16 rotates in the reverse direction, it drives the locking block 8 to move along a set straight line away from the locking member 7, causing the locking block 8 to disengage from the locking member 7. This design eliminates the need for the second elastic element 10 to drive the locking block 8 to move along the set straight line towards the locking member 7. In actual implementation, the rotation of the transmission gear 16 can be driven manually or electrically, without specific limitations.

[0162] In another example, a first sliding structure (not shown in the figure) is provided between the locking block 8 and the first structural member 100. The first sliding structure includes a first slide rail and a first slider that slides in cooperation with the first slide rail. One of the first slide rail and the first slider is provided on the locking block 8, and the other is provided on the first structural member 100. The length direction of the first slide rail is parallel to a set straight line. By sliding the first slider in cooperation with the first slide rail, the locking block 8 can also move along the set straight line on the first structural member 100 in a direction closer to or away from the locking member 7.

[0163] It should be noted that there are many structures that enable the locking block 8 to move along a set straight line on the first structural member 100 in a direction closer to or further away from the locking member 7, and they will not be listed here.

[0164] With locking components 400 provided at both ends of the length direction of the first structural member 100, in order to facilitate the separation of the locking blocks 8 in the locking components 400 at both ends of the length direction of the first structural member 100 from the locking members 7 in the same locking component 400, combined with Figure 13 and Figure 14 The driving members 9 in the two sets of locking assemblies 400 share a single control member 12, that is, the control members 12 in the locking assemblies 400 at both ends of the length direction of the first structural member 100 are integrated into one unit. When the locking assembly 400 includes the driving member 9, the control member 12 abuts against the driving members 9 of the two locking assemblies 400 respectively. The movement of the control member 12 can drive the driving members 9 of the two locking assemblies 400 to move, so that the locking blocks 8 of the two locking assemblies 400 move towards the locking member 7 of the same locking assembly 400. In this way, the locking blocks 8 of the locking assemblies 400 at both ends of the length direction of the first structural member 100 can be controlled simultaneously through a single control member 12, which facilitates the folding and opening of the headrest and helps to reduce the number of parts in the headrest, saving the manufacturing cost of the headrest.

[0165] Combination Figure 17 The control element 12 includes a push block 121, a knob 123, and a connecting rod 122. The push block 121 is disposed inside the first structural member 100 and is rotatably connected to the first structural member 100. The knob 123 is disposed outside the first structural member 100. The connecting rod 122 connects the push block 121 and the knob 123. Rotating the knob 123 can drive the push block 121 to rotate via the connecting rod 122, so that the rotation of the push block 121 can drive the driving members 9 in the two locking assemblies 400 to move away from each other. The push block 121 is elongated. By controlling the push block 121 to rotate inside the first structural member 100 relative to the driving members 9 in the two locking assemblies 400, the two sides of the push block 121 in the length direction push the two driving members 9 away from each other, thereby driving the two locking blocks 8 to separate from the locking members 7 in the same locking assembly 400, releasing the engagement between the locking blocks 8 and the locking members 7.

[0166] Combination Figure 14The driving component 9 includes a first body 91 and a second body 92 connected to the first body 91. The first body 91 is disposed at one end of the second body 92 near the locking component 7. The second body 92 includes a first segment 921 and at least one second segment 922 connected to the first segment 921. The first segment 921 and the second segment 922 are disposed at an angle. The second segment 922 connects the first segment 921 and the first body 91. The first segments 921 of the driving component 9 in the two locking assemblies 400 at both ends of the length direction of the first structural component 100 are spaced apart and arranged opposite to each other. The pushing block 121 is disposed between the first segments 921 of the driving component 9 in the two locking assemblies 400. In this example, the second bodies 92 in the two locking assemblies 400 at both ends of the length direction of the first structural component 100 are staggered in the thickness direction of the first structural component 100. When the locking blocks 8 in the two locking assemblies 400 at both ends of the length direction of the first structural member 100 are engaged with the locking members 7 of the same locking assembly 400, the first segments 921 of the two second bodies 92 on both sides of the width direction of the pushing block 121 abut against each other. When it is necessary to separate the locking blocks 8 of the two locking assemblies 400 at both ends of the length direction of the first structural member 100 from the locking members 7 of the same locking assembly, the pushing block 121 is rotated so that the two sides of the pushing block 121 abut against the first segments 921 of the two second bodies 92 respectively. Driven by the pushing block 121, the two locking blocks 8 move closer to each other, thereby separating the locking blocks 8 in the two locking assemblies 400 from the locking members 7 of the same locking assembly 400 respectively.

[0167] In this example, within the same second body 92, the first segment 921 is perpendicular to the second segment 922.

[0168] For example, within the same second body 92, there are two second segments 922, which are parallel and spaced apart. Within the same second body 92, the two second segments 922 are respectively connected to the two ends of the first segment 921.

[0169] Of course, the shape of the push block 121 is not limited to a long strip. In other instances, the push block 121 can also be set to other shapes, such as a rhombus.

[0170] In one example, the knob 123 includes a knob body (not shown in the figure) and a decorative cover (not shown in the figure). The knob body is connected to the connecting rod 122, and the decorative cover is disposed on the outer periphery of the knob body, with an anti-slip structure formed on the outer periphery of the decorative cover. In this example, the anti-slip structure consists of multiple striped patterns extending along the axial direction of the decorative cover and arranged at equal intervals. The striped patterns can both increase the friction of the decorative cover surface to prevent the user from slipping during operation and enhance the aesthetics of the knob 123, thereby improving the overall aesthetics of the headrest.

[0171] In another example, the anti-slip structure can also be a pattern or other shape.

[0172] Of course, in other examples, an anti-slip structure can also be directly installed on the knob body.

[0173] In some other embodiments, see [reference] Figure 19 and Figure 20 The locking assembly 400 includes a second one-way gear 17 and a first locking gear 19. At least a portion of the first locking gear 19 is disposed on the second structural member 200. The first locking gear 19 is located on the outer periphery of the rotating shaft 301. The first locking gear 19 and the second one-way gear 17 are sequentially distributed along the axial direction of the rotating shaft 301, and the second one-way gear 17 is rotatable relative to the rotating shaft 301. Movement of the rotating shaft 301 along its axial direction can cause the first locking gear 19 to move closer to the second one-way gear 17 until the first locking gear 19 engages with the second one-way gear 17, thereby restricting the rotation of the second one-way gear 17 relative to the rotating shaft 301. Movement of the rotating shaft 301 along its axial direction can also cause the first locking gear 19 to move away from the second one-way gear 17 until the first locking gear 19 disengages from the second one-way gear 17, thereby releasing the restriction on the second one-way gear 17.

[0174] Combination Figure 2 The first locking gear 19 is positioned on the outer periphery of the rotating shaft 301. The axial movement of the rotating shaft 301 causes the first locking gear 19 to approach and mesh with the second one-way gear 17, thus restricting the second one-way gear 17 from rotating relative to the rotating shaft 301 in one direction. At this time, the first structural member 100 cannot rotate towards the second structural member 200 but can only rotate away from it. The angle α between the first structural member 100 and the second structural member 200 can only be increased, not decreased. Therefore, when the first locking gear 19 and the second one-way gear 17 are engaged, the angle α between the first structural member 100 and the second structural member 200 can be increased. After adjustment, the relative positions of the first structural member 100 and the second structural member 200 can be locked in one direction, preventing the angle α between them from decreasing due to unforeseen circumstances. When it is necessary to reduce the included angle α between the first structural component 100 and the second structural component 200, the rotating shaft 301 can be driven to move along its own axial direction, causing the first locking gear 19 to move away from the second one-way gear 17 until the first locking gear 19 and the second one-way gear 17 are separated, thereby releasing the restriction on the second one-way gear 17, allowing the second one-way gear 17 to rotate in one of the directions. At this time, the included angle between the first structural component 100 and the second structural component can be reduced.

[0175] In the aforementioned locking assembly 400, the first locking gear 19 moves closer to or further away from the second one-way gear 17 via the axial movement of the rotating shaft 301, thereby achieving engagement or disengagement between the first locking gear 19 and the second one-way gear 17. When the first locking gear 19 and the second one-way gear 17 are engaged, the first locking gear 19 restricts the second one-way gear 17 from rotating relative to the rotating shaft 301 in one of the directions; when the first locking gear 19 and the second one-way gear 17 are disengaged, the first locking gear 19 releases the restriction on the second one-way gear 17. Compared with the conventional locking assembly 400, the locking assembly 400 in this application is not only simple in structure, but also easy to adjust the included angle α between the first structural member 100 and the second structural member 200, making it convenient for users.

[0176] The second one-way gear 17 can rotate relative to the shaft 301 in either the first or second direction. The first direction is opposite to the second direction. When the first locking gear 19 meshes with the second one-way gear 17, the first locking gear 19 restricts the second one-way gear 17 from rotating relative to the shaft 301 in the first direction. When the first locking gear 19 separates from the second one-way gear 17, the first locking gear 19 releases the restriction on the second one-way gear 17, so that the second one-way gear 17 can rotate relative to the shaft 301 in either the first or second direction. It should be noted that, in this embodiment, the first direction is the direction of rotation of the second one-way gear 17 relative to the rotating shaft 301 during the process of adjusting the included angle α between the first structural member 100 and the second structural member 200 from large to small, that is, the first direction is the direction indicated by arrow Y1 in the figure; the second direction is the direction of rotation of the second one-way gear 17 relative to the rotating shaft 301 during the process of adjusting the included angle α between the first structural member 100 and the second structural member 200 from small to large, that is, the second direction is the direction indicated by arrow X1 in the figure. When the first locking gear 19 and the second one-way gear 17 are engaged, the rotation of the second one-way gear 17 relative to the rotating shaft 301 along the first direction is restricted. At this time, only the included angle α between the first structural member 100 and the second structural member 200 can be increased, but not decreased, to prevent the included angle α between the first structural member 100 and the second structural member 200 from decreasing due to accidental reduction.

[0177] To facilitate the movement of the rotating shaft 301 along its own axial direction, in one example, the locking assembly 400 further includes a second pushing part 21. The second pushing part 21 is disposed at at least one end of the axial direction of the rotating shaft 301, and at least a portion of the second pushing part 21 is exposed outside the first structural member 100. In this way, the user can push the rotating shaft 301 to move through the second pushing part 21, thereby causing the first locking gear 19 to move closer to or away from the second one-way gear 17.

[0178] For example, there are two second pushing parts 21, and the two second pushing parts 21 are respectively provided at both ends of the axial direction of the rotating shaft 301, so that the rotating shaft 301 can be pushed by the second pushing parts 21 at both ends of the axial direction of the rotating shaft 301.

[0179] Of course, in other examples, the number of second pushers 21 can also be set to one, with the second pusher 21 provided at one end of the axial direction of the rotating shaft 301.

[0180] When a rotating member 300 connects the first structural member 100 and the second structural member 200, the first locking gear 19 is mounted on the second structural member 200 via a connecting block 302 of the rotating member 300. A rotating shaft 301 passes through and is fixed to the connecting block 302, and one end of the first structural member 100 is rotatably connected to the rotating shaft 301. Figure 21 The connecting block 302 is provided with a first receiving groove 3023 for accommodating the first locking gear 19. The opening of the first receiving groove 3023 faces the second one-way gear 17. A first guide structure is provided on the inner wall of the first receiving groove 3023, and a second guide structure is provided on the outer periphery of the first locking gear 19. One of the second guide structure and the first guide structure is a guide protrusion 1911, and the other is a first guide groove 3024. The length direction of the first guide groove 3024 is parallel to the axial direction of the rotating shaft 301. The guide protrusion 1911 can slide back and forth in the first guide groove 3024 and along the length direction of the first guide groove 3024. In this example, the second guide structure is the guide protrusion 1911, and the first guide structure is the first guide groove 3024. By slidingly engaging the guide protrusion 1911 with the first guide groove 3024, the movement of the first locking gear 19 can be guided, reducing the risk of the first locking gear 19 deviating from its direction of movement. Furthermore, the cooperation between the guide protrusion 1911 and the first guide groove 3024 can also restrict the relative rotation between the connecting block 302 and the first locking gear 19. In actual implementation, the toothed end of the second one-way gear 17 faces the opening of the first receiving groove 3023. In this way, the end of the first locking gear 19 close to the second one-way gear 17 can be moved out of the opening of the first receiving groove 3023 and can mesh with the second one-way gear 17; when the first locking gear 19 moves towards the bottom of the first receiving groove 3023, the first locking gear 19 can be separated from the second one-way gear 17.

[0181] In one example, the second one-way gear 17 includes a second gear body 171 and a plurality of first one-way teeth 172. The second gear body 171 is disposed on the outer periphery of the rotating shaft 301, and the plurality of first one-way teeth 172 are all disposed at one end of the second gear body 171 near the first locking gear 19, and the first one-way teeth 172 are distributed sequentially around the axis of the second gear body 171. The first locking gear 19 includes a third gear body 191 and a plurality of second one-way teeth 192. At least a portion of the third gear body 191 is disposed in the connecting block 302, and the plurality of second one-way teeth 192 are all disposed at the end of the third gear body 191 facing the second one-way gear 17, and the plurality of second one-way teeth 192 are distributed sequentially around the axis of the third gear body 191. The second one-way teeth 192 mesh with the first one-way teeth 172 in a one-to-one correspondence. A second guide structure is disposed on the outer periphery of the third gear body 191. Multiple first one-way teeth 172 are provided at one end of the second gear body 171 and multiple second one-way teeth 192 are provided at one end of the third gear body 191. The second one-way teeth 192 mesh with the first one-way gears one by one, so that the first locking gear 19 can mesh with the second one-way teeth 192 distributed at multiple positions at the end of the third gear body 191, thereby limiting the multiple gear positions of the second one-way gear 17 and improving the flexibility of use.

[0182] In one example, see Figures 22 to 24The rotating shaft 301 includes a first shaft 3012 and a second shaft 3013 arranged at intervals, with the axes of the first shaft 3012 and the second shaft 3013 coinciding. When two connecting portions 103 are provided on the same end of the first structural member 100, there are two second one-way gears 17 and two first locking gears 19. Each connecting portion 103 has a second one-way gear 17 inside, and one first locking gear 19 is located on the first shaft 3012, while the other is located on the second shaft 3013. The first locking gears 19 on the first shaft 3012 and the second shaft 3013 correspond one-to-one with the second one-way gears 17 inside the two connecting portions 103, and the first locking gear 19 can mesh with its corresponding second one-way gear 17. In this example, the first shaft 3012 and the first locking gear 19 located on the first shaft 3012 are integrally formed, making the first shaft 3012 and the first locking gear 19 integrated into a single component. The second shaft 3013 is integrally formed with the first locking gear 19 located on the second shaft 3013, so that the first shaft 3012 and the first locking gear 19 are integrated into a single component. In actual implementation, when the headrest has a connecting block 302, the connecting block 302 is located between the two connecting portions 103, and both connecting portions 103 are provided with mounting holes 1031. The end of the mounting hole 1031 near the first locking gear 19 is the first end, and the end of the mounting hole 1031 away from the first locking gear 19 is the second end. The second one-way gear 17 is disposed in the mounting hole 1031, and the portion of the inner wall of the mounting hole 1031 between the second one-way gear 17 and the first end is the connecting section. One end of the first locking gear 19 is disposed in the first receiving groove 3023 of the connecting block 302, and the other end protrudes from the connecting block 302 and extends into the mounting hole 1031 from the first opening end of the mounting hole 1031, where it is rotatably connected to the connecting section. At this time, the first locking gear 19 (i.e., the first shaft 3012 or the second shaft 3013) is rotatably connected to the inner wall of the mounting hole 1031. When the first locking gear 19 is separated from the second one-way gear 17, the toothless part of the first locking gear 19 serves as the first shaft 3012 or the second shaft 3013 and is connected to the connecting section in the mounting hole 1031. When the first locking gear 19 is moved closer to the corresponding second one-way gear 17, the second one-way tooth 192 on the end of the first locking gear 19 near the second one-way gear 17 meshes with the second one-way gear 17, thereby restricting the second one-way gear 17 from rotating in the first direction. By having two first locking gears 19 mesh one-to-one with two second one-way gears 17 on the same end of the first structural member 100, the locking force on the first structural member 100 can be increased, thereby improving the load-bearing capacity of the headrest. In addition, since the first shaft 3012 and the second shaft 3013 are integrally formed with the first locking gears 19, the structure of the headrest can be simplified, and manufacturing materials can be saved.

[0183] In other examples, the first shaft 3012 and the first locking gear 19 located on the first shaft 3012 can also be configured as a separate structure, and the second shaft 3013 and the first locking gear 19 located on the second shaft 3013 can also be configured as a separate structure. Here, no specific restrictions are placed on the forming method of the first shaft 3012 and the first locking gear 19 located on the first shaft 3012, nor on the forming method of the second shaft 3013 and the first locking gear 19 located on the second shaft 3013.

[0184] In actual implementation, the connecting block 302 is provided with two first receiving grooves 3023. The two first receiving grooves 3023 are distributed along the axial direction of the first shaft 3012 or the second shaft 3013. The two first receiving grooves 3023 correspond one-to-one with the two first locking gears 19, and the first receiving grooves 3023 are used to accommodate the corresponding first locking gears 19.

[0185] Furthermore, the locking assembly 400 also includes a third elastic element 20, of which there are two. The two third elastic elements 20 correspond one-to-one with the two first locking gears 19, and the third elastic element 20 is connected between the connecting block 302 and the corresponding first locking gear 19. The third elastic element 20 always has the tendency to drive the corresponding first locking gear 19 toward the second one-way gear 17. In actual implementation, external force pushes the first shaft 3012 and the second shaft 3013 to move along the axial direction of the first shaft 3012 (or the second shaft 3013), which can separate the first locking gear 19 from the corresponding second one-way gear 17. After adjusting the included angle α between the first structural member 100 and the second structural member 200, the external force is removed. Under the action of the elastic force of the third elastic member 20, the third elastic member 20 drives the first shaft 3012 and the second shaft 3013 to move towards the corresponding second one-way gear 17 and drive the first locking gear 19 to mesh with the corresponding second one-way gear 17, thereby realizing the automatic meshing of the first locking gear 19 with the corresponding second one-way gear 17, which is convenient to use.

[0186] For example, the connecting block 302 is located between the two connecting parts 103. When the connecting block 302 is provided with a second receiving groove 286, the two third elastic members 20 are respectively provided in the two second receiving grooves 286. The two ends of the third elastic members 20 are respectively connected to the bottom of the corresponding second receiving groove 286 and the corresponding first locking gear 19.

[0187] It should be noted that the bottom of the second receiving groove 286 refers to the groove wall of the second receiving groove 286 facing the groove opening.

[0188] To facilitate the separation of the first locking gear 19 from the second one-way gear 17, in one example, the locking assembly 400 further includes a third pushing part 22. There are two third pushing parts 22, each corresponding to one of the two connecting parts 103. The third pushing parts 22 are disposed in their respective connecting parts 103 and are movable within them. The third pushing parts 22 are used to push the first locking gear 19 in the corresponding connecting part 103 to move, thereby separating the first locking gear 19 from the second one-way gear 17. In this embodiment, one end of the third pushing part 22 extends into the mounting hole 1031 of the corresponding connecting part 103 and connects to the first locking gear 19. The other end of the third pushing part 22 protrudes from the outside of the first structural member 100, facilitating user-assisted pushing of the third pushing part 22.

[0189] In one example, the two third pushers 22 are respectively engaged with the two first locking gears 19 in a one-to-one manner.

[0190] Furthermore, the third pushing part 22 includes a pushing body 221 and a fastening member 222 disposed on one end of the pushing body 221. The fastening member 222 is used to engage with the first locking gear 19 to realize the connection between the third pushing part 22 and the first locking gear 19.

[0191] Of course, in other examples, the third pusher 22 can also be connected to the first locking gear 19 through other structures, such as screws, threaded structures, etc., or the third pusher 22 can be directly welded to the first locking gear 19. Here, no specific restrictions are placed on the connection structure between the third pusher 22 and the first locking gear 19.

[0192] For example, the second one-way gear 17 and the connecting part 103 are integral structures. Of course, in other examples, the second one-way gear 17 and the connecting part 103 can also be set as separate structures, which is not specifically limited here.

[0193] For example, the first locking gear 19 can also be moved toward or away from the second one-way gear 17 by the following structure:

[0194] The first structural member 100 has an externally movable linkage structure. The linkage structure is connected to the rotating shaft 301 and is exposed outside the first structural member 100. Thus, the user can move or rotate the linkage structure outside the first structural member 100 to drive the rotating shaft 301 to move along its own axis. This allows the rotating shaft 301 to drive the first locking gear 19 to move along the axis of the rotating shaft 301 toward or away from the second one-way gear 17.

[0195] In one feasible embodiment, the linkage structure includes a linkage gear and a linkage rack meshing with the linkage gear. The length direction of the linkage rack is parallel to the axial direction of the first locking gear 19, and the linkage rack is connected to the first locking gear 19. A knob 123 is provided on the linkage gear, exposed outside the first structural member 100, and the knob 123 is coaxial with the linkage gear. When the user rotates the knob 123 outside the first structural member 100, the linkage gear rotates, thereby causing the linkage rack meshing with the linkage gear to move along the axial direction of the first locking gear 19, and further causing the first locking gear 19 to slide, thereby controlling the engagement or disengagement of the first locking gear 19 with the second one-way gear 17. It is understood that in this linkage structure, there is no need to provide a third elastic member 20 to provide a spring force for the first locking gear 19 to move towards the second one-way gear 17.

[0196] In another feasible embodiment, the first locking gear 19 is fixed relative to the rotating shaft 301, an electromagnet is provided at the second one-way gear 17, and a magnetic attraction element is provided on the first locking gear 19. Alternatively, the first locking gear 19 can be made of magnetic material to form a permanent magnet. When the electromagnet at the second one-way gear 17 is energized, the electromagnet generates a magnetic attraction force on the first locking gear 19. Under the action of the magnetic attraction force, both the first locking gear 19 and the rotating shaft 301 move along the axial direction of the rotating shaft 301, thereby enabling the first locking gear 19 to move along the axial direction of the rotating shaft 301 towards the second one-way gear 17 until it engages with the second one-way gear 17 to achieve locking. In a specific embodiment, when the first locking gear 19 is a permanent magnet, the magnetic pole of the end of the first locking gear 19 near the electromagnet can be set as the N pole. When it is necessary to move the first locking gear 19 towards the second one-way gear 17, the direction of the current of the electromagnet at the second one-way gear 17 is controlled so that the magnetic pole of the end of the electromagnet near the first locking gear 19 is the S pole. At this time, the electromagnet generates a magnetic attraction force on the first locking gear 19. When it is necessary to move the first locking gear 19 away from the second one-way gear 17, the direction of the current on the electromagnet is reversed. At this time, the magnetic pole of the end of the electromagnet near the first locking gear 19 becomes the N pole, generating a repulsive force on the first locking gear 19, so that the first locking gear 19 can slide away from the second one-way gear 17, thereby separating the first locking gear 19 from the second one-way gear 17.

[0197] It should be noted that there are many structures that can move the first locking gear 19 toward or away from the second one-way gear 17, which will not be listed here.

[0198] In some embodiments, see Figures 25 to 27The first structural component 100 includes a first split 101, a second split 102, and a first locking component 23. The first split 101 and the second split 102 are slidably connected to each other, so that the length of the first structural component 100 is adjustable. In this example, the first split 101 and the second split 102 slide relative to each other along the length direction of the first structural component 100, which is the direction parallel to the arrow X2 in the figure. The first locking component 23 includes a first locking member 231 and a fourth elastic member 233. The first locking member 231 is connected to the second split 102 through the fourth elastic member 233. The first split 101 is provided with at least two snap-fit ​​holes 1015, which are distributed at intervals along the relative sliding direction of the first split 101 and the second split 102. The fourth elastic member 233 has a tendency to drive the first locking member 231 toward the locking hole 1015 so that the first locking member 231 can be locked in either locking hole 1015, thereby locking the relative position of the first split body 101 and the second split body 102. When the first locking member 231 is locked in the locking hole 1015, part of the first locking member 231 is exposed outside the first split body 101 for operation.

[0199] It is understandable that when the headrest has one second structural member 200, one of the first part 101 and the second part 102 is connected to the second structural member 200. When the headrest has two second structural members 200, one of the first part 101 and the second part 102 is connected to one of the second structural members 200, and the other is connected to the other second structural member 200.

[0200] When the headrest is in normal use, the first structural member 100 is set in an inclined or upright position. At this time, one end of the first split 101 is located above the second split 102 and connected to the second structural member 200 used to support the user's head. This allows the length of the first structural member 100 to be extended or shortened when the first split 101 slides relative to the second split 102, thereby adjusting the height position of the second structural member 200 supporting the user's head. This enables the headrest to adapt to the usage needs of users of different heights and improves the user's comfort.

[0201] When it is necessary to adjust the length of the first structural member 100, the first locking member 231 is pushed out of the locking hole 1015, releasing the locking of the first split body 101 and the second split body 102, allowing the first split body 101 and the second split body 102 to slide relative to each other. When the first locking member 231 is engaged in the locking hole 1015, a portion of the first locking member 231 is exposed outside the first split body 101. The user can press the first locking member 231 on the outside of the first structural member 100 and disengage the first locking member 231 from the locking hole 1015, thereby allowing the first split body 101 and the second split body 102 to slide relative to each other, achieving the purpose of adjusting the length of the first structural member 100. Since the first locking member 231 is connected to the second split body 102 through the fourth elastic member 233, when the first locking member 231 is aligned with the locking hole 1015, under the pre-tightening force of the fourth elastic member 233, the fourth elastic member 233 can drive the first locking member 231 to engage in the locking hole 1015, thereby automatically locking the first split body 101 and the second split body 102. This first structural member 100 has a simple structure, which is conducive to manufacturing and reduces processing costs. Furthermore, adjusting the length of the first structural member 100 is relatively simple, which helps to improve the user experience.

[0202] In one example, the snap-fit ​​hole 1015 has three or more, for example, the number of snap-fit ​​holes 1015 is set to three, four or five, so that the first structural member 100 has at least three adjustment positions, and the first structural member 100 can be adjusted to at least three different lengths.

[0203] In actual implementation, the number of snap-fit ​​holes 1015 can be flexibly adjusted as needed. This application does not limit the number of snap-fit ​​holes 1015.

[0204] Combination Figure 27 The first locking member 231 includes a limiting part 2311 and an operating part 2312 connected to the limiting part 2311. The limiting part 2311 is connected to the fourth elastic member 233. The size of the limiting part 2311 is larger than the size of the locking hole 1015 to prevent the limiting part 2311 from entering the locking hole 1015. The size of the operating part 2312 is smaller than or equal to the size of the locking hole 1015 so that the operating part 2312 can enter the locking hole 1015 and engage in the locking hole 1015. By setting the size of the limiting part 2311 to be larger than the size of the operating part 2312, the operating part 2312 can enter the locking hole 1015 and engage in the locking hole 1015, while preventing the limiting part 2311 from passing through the locking hole 1015. This effectively prevents the first locking member 231 from being driven by the fourth elastic member 233 to pass entirely through the locking hole 1015, thus avoiding the situation where the first locking member 231 disengages from the locking hole 1015. Since the operating part 2312 can enter the snap-fit ​​hole 1015, the user can press the operating part 2312 on the outside of the first split body 101 to operate the first locking member 231.

[0205] Furthermore, the end of the limiting part 2311 away from the fourth elastic member 233 protrudes from the periphery of the operating part 2312, so that a limiting surface 2313 is formed between the limiting part 2311 and the operating part 2312. When the operating part 2312 is engaged in the engaging hole 1015, the limiting surface 2313 abuts against the opening end of the engaging hole 1015, thereby enabling the operating part 2312 to be stably engaged in the engaging hole 1015.

[0206] Combination Figure 31 A chamfered structure 2315 is provided between the side of the operating part 2312 facing away from the limiting part 2311 and the periphery of the operating part 2312. The chamfered structure 2315 avoids sharp edges around the operating part 2312. It is understood that when adjusting the length of the first structural member 100, the operating part 2312 needs to be pressed until it disengages from the snap-fit ​​hole 1015. Under the action of the fourth elastic member 233, during the sliding process of the first split 101 relative to the second split 102, the end of the operating part 2312 away from the limiting part 2311 will contact the first split 101. The presence of the chamfered structure 2315 can reduce the risk of positional interference between the operating part 2312 and the first split 101 and improve the smoothness of the sliding between the first split 101 and the second split 102.

[0207] In one example, combined Figures 28 to 30 The second split body 102 has a first positioning groove 1021 on the side opposite to the first locking member 231. Part of the first locking member 231 is slidably disposed in the first positioning groove 1021. The fourth elastic member 233 is connected between the bottom of the first positioning groove 1021 and the first locking member 231. It can be understood that when the first locking member 231 slides along the direction from the bottom of the first positioning groove 1021 toward the opening, the first locking member 231 can be engaged in the engaging hole 1015, thereby locking the first split body 101 and the second split body 102; when the first locking member 231 moves along the direction from the opening of the first positioning groove 1021 toward the bottom, the first locking member 231 can disengage from the engaging hole 1015, thereby releasing the locking of the first split body 101 and the second split body 102. By providing a first positioning groove 1021 on the side of the second split 102 opposite to the first locking member 231, a portion of the first locking member 231 can be slidably disposed in the first positioning groove 1021. The first positioning groove 1021 can position the first locking member 231 and prevent the movement direction of the first locking member 231 from tilting.

[0208] Furthermore, one of the groove sidewalls of the first locking member 231 and the first positioning groove 1021 is provided with a second guide groove 1022, and the other is provided with a first guide protrusion 2314. In this example, the first guide protrusion 2314 is provided on the first locking member 231, and the second guide groove 1022 is provided on the groove sidewall of the first positioning groove 1021. When the first locking member 231 includes a limiting part 2311, the first guide protrusion 2314 is provided on the limiting part 2311. The extending direction of the second guide groove 1022 is parallel to the sliding direction of the first locking member 231 relative to the second split 102. The first guide protrusion 2314 slides in cooperation with the second guide groove 1022. Through the cooperation and sliding of the first guide protrusion 2314 with the second guide groove 1022, the sliding direction of the first locking member 231 is prevented from tilting.

[0209] In other examples, the first guide protrusion 2314 may be disposed on the groove sidewall of the first positioning groove 1021, and the second guide groove 1022 may be disposed on the first locking member 231.

[0210] Explained, the groove sidewall of the first positioning groove 1021 refers to the portion of the groove wall of the first positioning groove 1021 located between the groove bottom and the groove opening.

[0211] The first locking component 23 also includes a second positioning post 232. One end of the second positioning post 232 is connected to the bottom of the first positioning groove 1021. The fourth elastic member 233 is sleeved on the outer periphery of the second positioning post 232. In this way, the second positioning post 232 can be used to position the fourth elastic member 233, and it is also beneficial to install the fourth elastic member 233.

[0212] In another embodiment, the first locking member 231 is rotatably connected to the second split body 102. The first locking member 231 can rotate about the axis of the connection between the first locking member 231 and the second split body 102 in a direction closer to or away from the locking hole 1015. The fourth elastic member 233 is used to drive the first locking member 231 to rotate closer to the locking hole 1015. The fourth elastic member 233 is a torsion spring, with one end connected to the second split body 102 and the other end connected to the first locking member 231. One end of the first locking member 231 is rotatably connected to the second split body 102 through a rotating pin, so that the first locking member 231 can rotate about the axis of the rotating pin, and the other end can be locked in the locking hole 1015. The fourth elastic member 233 has a tendency to drive the first locking member 231 to rotate about the axis of the rotating pin in a direction closer to the locking hole 1015. Under normal conditions, the first structural member 100 is engaged in the locking hole 1015 by the fourth elastic member 233. When the length of the first structural member 100 needs to be adjusted, the first locking member 231 is pressed. The pressing force on the first locking member 231 overcomes the preload of the fourth elastic member 233, causing the first locking member 231 to rotate around the axis of the rotating pin in a direction away from the locking hole 1015 until the first locking member 231 disengages from the locking hole 1015, thereby allowing the first split body 101 and the second split body 102 to slide relative to each other. This design results in a more uniform stress distribution on the fourth elastic member 233 during the rotation of the first locking member 231, reducing damage to the fourth elastic member 233, extending its service life, and enhancing its durability.

[0213] In another example, see Figure 32The first locking component 23 further includes a first sliding member 234, which is slidably connected to the second split 102. Along the relative sliding direction between the first split 101 and the second split 102, the first sliding member 234 can slide relative to the second split 102. One end of the fourth elastic member 233 is connected to the second split 102, and the other end is connected to the first sliding member 234. A first locking member 231 is disposed on one side of the first sliding member 234. At least a portion of the first sliding member 234 abuts against the first locking member 231, and the abutment surface between the first sliding member 234 and the first locking member 231 is an inclined surface 2341. In the relative sliding direction between the first split 101 and the second split 102, the inclined surface 2341 gradually tilts away from the first locking member 231 along the direction close to the locking hole 1015, so that when the first sliding member 234 moves towards the direction where the first locking member 231 is located, it can push the first locking member 231 into the locking hole 1015. In this example, the fourth elastic member 233 always has the tendency to drive the first sliding member 234 to move in the direction of the first locking member 231, so that the fourth elastic member 233 can push the first locking member 231 into the locking hole 1015 and lock it in the locking hole 1015 through the first sliding member 234. Since at least a portion of the first sliding member 234 abuts against the first locking member 231, under normal conditions, the preload of the fourth elastic member 233 causes the first sliding member 234 to push the first locking member 231 into the locking hole 1015 and engage in the locking hole 1015. When it is necessary to adjust the length of the first structural member 100, the first locking member 231 is pressed. The pressing force on the first locking member 231 overcomes the preload of the fourth elastic member 233 and pushes the first sliding member 234 to move away from the location of the first locking member 231. Under the action of the inclined surface 2341, as the first sliding member 234 continues to move, the first locking member 231 gradually exits the locking hole 1015 until it disengages from the locking hole 1015. After the first locking member 231 disengages from the locking hole 1015, the first split 101 and the second split 102 can slide relative to each other. When the pressure on the first locking member 231 is released, under the pre-tightening force of the fourth elastic member 233, the fourth elastic member 233 drives the first sliding member 234 to move in the direction of the first locking member 231 along the relative sliding direction between the first split 101 and the second split 102, causing the first locking member 231 to enter and engage in the locking hole 1015. In this design, since the fourth elastic member 233 is connected to the first locking member 231 through the first sliding member 234, as the first sliding member 234 slides along the relative sliding direction between the first split 101 and the second split 102, it drives the first locking member 231 to engage in or disengage from the locking hole 1015, thus reducing the overall thickness of the first structural member 100.

[0214] It should be noted that there are many specific structures for driving the first locking element 231 to engage with the locking hole 1015, which will not be listed here. In actual implementation, the specific structure can be flexibly selected according to the needs.

[0215] See Figure 26 The first segment 101 has a first groove 1011 at one end along its length. The second segment 102 has one end slidably disposed in the first groove 1011. A snap-fit ​​hole 1015 is located on the sidewall of the first groove 1011. A fourth elastic element 233 is disposed in the first groove 1011 and connected to the portion of the second segment 102 disposed in the first groove 1011. Since one end of the second segment 102 is slidably disposed in the first groove 1011, the overall length of the first structural member 100 can be adjusted by adjusting the length of one end of the second segment 102 extending into the first groove 1011. The fourth elastic element 233 is disposed in the first groove 1011, and the sidewall of the first groove 1011 protects the fourth elastic element 233 from external dust and other contaminants, improving its service life and reliability.

[0216] In this example, the fourth elastic element 233 is a spring, but it is not limited to this. The fourth elastic element 233 can also be an elastic sheet, etc. Any component that can provide elastic restoring force is acceptable.

[0217] In one example, the snap-fit ​​hole 1015 penetrates the sidewall of the first groove 1011, forming a through hole connecting the outside of the first split body 101 and the first groove 1011. The first locking member 231 is snapped into the snap-fit ​​hole 1015, allowing the user to directly press the first locking member 231 from the outside of the first split body 101 for easy operation. When the snap-fit ​​hole 1015 penetrates the sidewall of the first groove 1011, the first locking member 231 becomes part of the sidewall of the first groove 1011.

[0218] In other embodiments, the second part 102 is disposed on the outside of the first part 101, and the snap-fit ​​hole 1015 passes through the opposite sides of the first part 101. In this way, it is not necessary to provide the first groove 1011 on the first part 101, making the structure of the first structural member 100 simpler.

[0219] To ensure smooth sliding between the first component 101 and the second component 102, a second sliding structure (not shown in the figure) is provided between them. This second sliding structure includes a second slide rail and a second slider that slides in cooperation with the slide rail. The length direction of the second slide rail is parallel to the relative sliding direction of the first component 101 and the second component 102. One of the second slide rail and the second slider is located on the first component 101, and the other is located on the second component 102. Furthermore, the sliding of the second slider in cooperation with the second slide rail also prevents the sliding direction of the first component 101 and the second component 102 from shifting.

[0220] In other embodiments, see Figures 33 to 36 The first structural member 100 includes a first split body 101, a second split body 102, and a second locking component 24. The first split body 101 and the second split body 102 are slidably connected to allow the length of the first structural member 100 to be adjustable. In this example, the second locking component 241 and the second split body 102 are an integral structure. In other examples, the second locking component 241 and the second split body 102 can also be set as separate structures. This application does not impose specific limitations on the forming method of the second locking component 241 and the second split body 102. The second locking component 24 includes a second locking component 241, a locking block, and a fifth elastic component 243. The second locking component 241 is disposed on the second split body 102 and combined with... Figure 40 The second locking member 241 is provided with a plurality of first engaging portions 2411, which are spaced apart along the relative sliding direction of the first split 101 and the second split 102. In this example, the first split 101 and the second split 102 slide relative to each other along the length direction of the first structural member 100. A first locking block 242 is provided on the first split 101, and a fifth elastic member 243 is used to apply a preload force to the first locking block 242 in a direction closer to the second locking member 241, so that the first locking block 242 can engage with any of the first engaging portions 2411 to lock the first split 101 and the second split 102. The first locking block 242 can move away from the second locking member 241 until it separates from the second locking member 241 to release the locking of the first split 101 and the second split 102.

[0221] When the headrest is in normal use, the first structural member 100 is placed on the placement member in an inclined or upright position. Alternatively, if the headrest has two second structural members 200, the first structural member 100 is placed on the second structural member 200, which is located on the placement member, in an inclined or upright position. By sliding the first split 101 and the second split 102 relative to each other, the length of the first structural member 100 can be adjusted, thereby adjusting the height of the second structural member 200, which supports the user's head, so that the headrest can meet the usage needs of users of different heights.

[0222] Multiple first engaging portions 2411 are provided on the second locking member 241. The multiple first engaging portions 2411 are distributed sequentially at intervals along the relative sliding direction of the first split 101 and the second split 102. The relative position of the first split 101 and the second split 102 can be locked by the first locking block 242 engaging with any of the first engaging portions 2411, thereby improving the accuracy of length adjustment of the first structural member 100. The fifth elastic member 243 can apply a pre-tightening force to the first locking block 242 to move towards the second locking member 241. When no external force is applied to the first locking block 242, it can ensure that the first locking block 242 engages with the first engaging portions 2411 on the second locking member 241. When the length of the first structural member 100 needs to be adjusted, the external force presses the first locking block 242 to overcome the pre-tightening force of the fifth elastic member 243, causing the first locking block 242 to disengage from the first engaging part 2411. Then, the first split 101 slides relative to the second split 102, thereby adjusting the length of the first structural member 100. After the first structural member 100 is adjusted to a suitable length, the external force is released. Under the action of the pre-tightening force of the fifth elastic member 243, the first locking block 242 is driven to automatically engage with the first engaging part 2411 on the second locking member 241, which is convenient for operation.

[0223] In one example, combined Figure 37 and Figure 38 The second locking member 241 is provided with multiple locking teeth, which are distributed sequentially and at intervals along the relative sliding direction of the first split body 101 and the second split body 102. These locking teeth form a first engaging portion 2411, thereby locking the relative positions of the first split body 101 and the second split body 102. When the second locking member 241 and the second split body 102 are an integral structure, the second split body 102 protrudes to form the locking tooth structure, thus forming the second locking member 241. The first locking block 242 is provided with a second engaging portion 2425, which engages with the first engaging portion 2411 to lock the first split body 101 and the second split body 102. In this example, the second engaging portion 2425 is an engaging groove that engages with the locking teeth (i.e., the first engaging portion 2411) on the second locking member 241.

[0224] Of course, in other embodiments, the first engagement portion 2411 and the second engagement portion 2425 can be other structures. The specific structures of the first engagement portion 2411 and the second engagement portion 2425 are not limited here. The structure of the second engagement portion 2425 on the first locking block 242 can be flexibly adjusted according to the structure of the first engagement portion 2411. For example, when the first engagement portion 2411 is a tooth, the second engagement portion 2425 is a groove; when the first engagement portion 2411 is a recess (e.g., a groove), the second engagement portion 2425 is a protrusion (e.g., a tooth). However, it should be noted that the protrusion is not limited to a tooth; any protruding structure that can engage with the recess is acceptable.

[0225] The second locking component 24 also includes a limiting seat 244, which is disposed on the first split body 101. The limiting seat 244 is provided with a limiting groove 2445, and a first locking block 242 is disposed in the limiting groove 2445. The first locking block 242 protrudes from one side of the limiting seat 244 for engaging with the first engaging portion 2411 on the second locking component 241. A fifth elastic member 243 is disposed between the bottom of the limiting groove 2445 and the first locking block 242. Under external pressure, the first locking block 242 can move in the direction from the opening of the limiting groove 2445 to the bottom of the groove. After the external force is removed, under the drive of the fifth elastic element 243, the first locking block 242 can move in the direction from the bottom of the limiting groove 2445 to the opening of the groove. Since part of the first locking block 242 is set in the limiting groove 2445, the movement of the first locking block 242 can be limited by the side wall of the limiting groove 2445.

[0226] It should be explained that, in this application, the bottom of the limiting groove 2445 refers to the groove wall opposite to the opening of the limiting groove 2445.

[0227] Combination Figure 38 The limiting seat 244 includes a first main body 2441 and a third positioning post 2442. The first main body 2441 is provided with a limiting groove 2445 and is connected to the first split body 101. The limiting groove 2445 is located on the first main body 2441. One end of the third positioning post 2442 is connected to the bottom of the limiting groove 2445, and the other end extends toward the opening of the limiting groove 2445. A fifth elastic member 243 is sleeved on the outer periphery of the third positioning post 2442. The fifth elastic member 243 is positioned by the third positioning post 2442, facilitating the installation of the fifth elastic member 243.

[0228] In one example, the fifth elastic element 243 is a spring, but it is not limited to a spring.

[0229] In one example, the first segment 101 is provided with a first groove 1011, and one end of the second segment 102 along its length is movably inserted into the first groove 1011. At least a portion of the second locking member 241 and the limiting seat 244 are both disposed in the first groove 1011. After releasing the engagement between the first locking block 242 and the second locking member 241, the first segment 101 can be slid relative to the second segment 102 to adjust the length of the second segment 102 inserted into the first segment 101, thereby adjusting the overall length of the first structural member 100. Since one end of the second segment 102 along its length is movably inserted into the first groove 1011, the groove wall of the first groove 1011 can guide the second segment 102 during the process of adjusting the length of the second segment 102 inserted into the first segment 101.

[0230] Combination Figure 34 and Figure 39 The second locking member 241 has a through hole 2412. The length direction of the hole 2412 is parallel to the relative sliding direction of the first split 101 and the second split 102. The first engaging part 2411 is provided on at least one side of the second locking member 241 in the width direction of the hole 2412. The first groove 1011 has a first clearance hole 1012 on one sidewall facing away from the first engaging part 2411. The first clearance hole 1012 is opposite to the hole 2412. A portion of the first locking block 242 can pass through the hole 2412 and the first clearance hole 1012 in sequence and protrude from the outside of the first split 101, so that a portion of the first locking block 242 is exposed outside the first split 101. In this way, the user can press the first locking block 242 from the outside of the first split 101 for easy operation.

[0231] Combination Figure 38 The first locking block 242 includes a locking body 2421 and a pressing part 2422 connected to the locking body 2421. The locking body 2421 is used to engage with the first engaging part 2411. A portion of the locking body 2421 is slidably disposed in the limiting groove 2445, and the size of the locking body 2421 is larger than the size of the first clearance hole 1012 to prevent the locking body 2421 from entering the first clearance hole 1012. The fifth elastic member 243 is connected to the locking body 2421. The size of the pressing part 2422 is smaller than or equal to the size of the first clearance hole 1012 so that the pressing part 2422 can enter the first clearance hole 1012. By slidingly engaging the locking body 2421 with the groove sidewall of the first groove 1011, the smoothness of the movement of the first locking block 242 is improved. Since the size of the locking body 2421 is larger than the size of the first clearance hole 1012, the locking body 2421 is prevented from entering the first clearance hole 1012. In this way, the locking body 2421 can be prevented from passing through the first clearance hole 1012 and causing the first locking block 242 to disengage from the limit seat 244.

[0232] In this example, the second locking member 241 has a first engaging portion 2411 on both sides of the opening 2412 in the width direction. The two ends of the locking body 2421 in the length direction protrude from both sides of the limiting seat 244 and engage with the first engaging portions 2411 on both sides of the opening 2412 in the width direction. By having the two ends of the locking body 2421 in the length direction engage with the first engaging portions 2411 on both sides of the opening 2412 in the width direction, the engagement strength between the locking body 2421 and the second locking member 241 is improved, which is beneficial to improving the load-bearing capacity of the first structural member 100.

[0233] In actual implementation, the first engaging part 2411 can be provided only on one side of the width direction of the opening 2412, and one end of the length direction of the locking body 2421 can engage with the first engaging part 2411. In this way, the relative positions of the first split body 101 and the second split body 102 can also be locked.

[0234] To facilitate the installation of the fifth elastic element 243, the first locking block 242 also includes a guide sleeve 2423. The guide sleeve 2423 is connected to the side of the locking body 2421 facing away from the pressing part 2422. When the limiting seat 244 includes the third positioning post 2442, the end of the fifth elastic element 243 away from the third positioning post 2442 is set in the guide sleeve 2423. When the fifth elastic element 243 undergoes elastic deformation, the guide sleeve 2423 can guide the deformation path of the fifth elastic element 243, thereby improving the stability and durability of the fifth elastic element 243.

[0235] To facilitate the assembly of the limiting seat 244, the second locking component 24 also includes a fastening structure (not shown in the figure), through which the limiting seat 244 is detachably connected to the first split 101.

[0236] Combination Figure 34 and Figures 36 to 38The fastening structure includes a first fastener and a second fastener. The first body 2441 of the limiting seat 244 has a first end and a second end opposite to the first end. The first end is located at the opening end of the limiting groove 2445. A first fixing hole 2443 is provided at the first end. A second fixing hole 1013 is provided on the groove sidewall opposite to the first end of the first groove 1011. One end of the first fastener passes through the second fixing hole 1013 and is disposed in the first fixing hole 2443. A third fixing hole 2444 is provided at the second end. A fourth fixing hole 1014 is provided on the groove sidewall opposite to the second end of the first groove 1011. One end of the second fastener passes through the fourth fixing hole 1014 and is disposed in the third fixing hole 2444. In this example, both the first fastener and the second fastener are screws. By having the first fastener and the second fastener respectively engaged at the first end and the second end of the first body 2441, the first body 2441 is stably connected to the first split part 101. Of course, in other examples, at least one of the first fastener and the second fastener can be other components, such as rivets, etc. No specific restrictions are placed on the structure of the first fastener and the second fastener here.

[0237] In actual implementation, the fastening structure can also be an adhesive layer or other structure, as long as it can fix the limiting seat 244 and the first part 101 relative to each other.

[0238] Understandably, during the process of the first locking block 242 disengaging from the second locking member 241, the first locking block 242 moves along the direction from the opening of the limiting groove 2445 to the bottom of the groove; during the process of the first locking block 242 engaging with the second locking member 241, the first locking block 242 moves along the direction from the bottom of the limiting groove 2445 to the opening of the groove.

[0239] To ensure smooth movement of the first locking block 242 within the limiting groove 2445, in one example, see [reference needed]. Figure 38 The limiting groove 2445 has a third guide groove 2446 on its sidewall. The third guide groove 2446 extends from the opening of the limiting groove 2445 to the bottom of the groove. The first locking block 242 also includes a second guide protrusion 2424 connected to the locking body 2421. The second guide protrusion 2424 protrudes from the locking body 2421 and can slide back and forth in the third guide groove 2446 along the extension direction of the third guide groove 2446. By sliding the second guide protrusion 2424 in the third guide groove 2446, the movement direction of the first locking block 242 in the limiting groove 2445 is prevented from deviating, reducing the risk of the first locking block 242 getting stuck during movement.

[0240] In another example, the limiting seat 244 also includes a third guide protrusion (not shown) connected to the first seat body 2441. A fourth guide groove (not shown) is provided on the outer side of the locking body 2421. The fourth guide groove extends in the direction from the opening of the limiting groove 2445 to the bottom of the groove. The third guide protrusion engages with the fourth guide groove and can slide back and forth in the fourth guide groove along its extension direction. By sliding the third guide protrusion in the guide groove, the first locking block 242 can also be prevented from shifting in the moving direction of the limiting groove 2445, reducing the risk of jamming during the movement of the first locking block 242.

[0241] It should be noted that in actual implementation, a third guide groove 2446 and a third guide protrusion can be provided on the side wall of the limiting groove 2445, or only the third guide groove 2446 or the third guide protrusion can be provided on the side wall of the limiting groove 2445.

[0242] For some further embodiments, see [link to relevant documentation]. Figures 41 to 43 The first structural member 100 includes a first split 101, a second split 102, and a third locking component. The first split 101 and the second split 102 are slidably connected to allow the length of the first structural member 100 to be adjustable. In normal use, when the headrest has one second structural member 200, the first structural member 100 is positioned at an angle or vertically on a placement surface (e.g., a table). When the headrest has two second structural members 200, the first structural member 100 is positioned at an angle or vertically on the second structural member 200 for placement on the placement surface. The third locking component includes a first locking member 25 and a second locking member 26. The first locking member 25 is disposed on the first split 101, and the second locking member 26 is disposed on the second split 102. The first locking member 25 has at least two engaging recesses 251, which are spaced apart sequentially along the relative sliding direction of the first split 101 and the second split 102. The relative sliding direction between the first component 101 and the second component 102 is parallel to the direction indicated by arrow X2 in the diagram. Figure 44 and Figure 45The second locking member 26 includes a fixed base 261, a second sliding member 262, and a positioning protrusion 263. The fixed base 261 is connected to the second split body 102, and the second sliding member 262 is slidably connected to the fixed base 261. The first locking member 25 is disposed on one side of the fixed base 261. The positioning protrusion 263 is movably disposed on the second sliding member 262 and can be inserted into any of the snap-fit ​​recesses 251. The positioning protrusion 263 has a first state and a second state. In the first state, at least a portion of the positioning protrusion 263 is exposed on the side of the fixed base 261 facing the first locking member 25 and inserted into the snap-fit ​​recess 251. In the second state, the positioning protrusion 263 retracts into the fixed base 261 and disengages from the snap-fit ​​recess 251. The positioning protrusion 263 can move with the second sliding member 262, allowing the positioning protrusion 263 to switch between the first and second states to be inserted into different snap-fit ​​recesses 251.

[0243] When the second slider 262 slides relative to the fixed base 261, it can drive the positioning protrusion 263 to move, allowing the positioning protrusion 263 to switch between a first state and a second state. In the first state, at least a portion of the positioning protrusion 263 is exposed on the side of the fixed base 261 facing the first locking member 25 and inserted into the snap-fit ​​recess 251 to lock the first split 101 and the second split 102. At this time, the length of the first structural member 100 cannot be adjusted. In the second state, the positioning protrusion 263 retracts into the fixed base 261 and disengages from the snap-fit ​​recess 251 to release the locking of the first split 101 and the second split 102. At this time, the first split 101 and the second split 102 can slide relative to each other, making the length of the first structural member 100 adjustable. In this structure, the first structural member 100 slides the second sliding member 262 on the fixed base 261, causing the positioning protrusion 263 to switch between the first state and the second state, so that the length of the first structural member 100 is adjustable. After the length of the first structural member 100 is adjusted to the correct position, the positioning protrusion 263 can lock the first split 101 and the second split 102. The operation is simple and helps to improve the user experience.

[0244] When the headrest is in normal use, if the headrest has one second structural member 200, the first structural member 100 is set on the placement piece in an inclined or vertical state. If the headrest has two second structural members 200, the first structural member 100 is set on the second structural member 200 placed on the placement piece in an inclined or vertical state. Therefore, by adjusting the overall length of the first structural member 100, the height position of the second structural member 200 supporting the user's head can be adjusted, so that the headrest can meet the usage needs of users of different heights.

[0245] In actual implementation, the first locking member 25 and the first split body 101 can be set as an integral structure. When the first locking member 25 and the first split body 101 are set as an integral structure, the first locking member 25 is part of the first split body 101. The first locking member 25 and the first split body 101 can also be set as a split structure. The first locking member 25 is assembled onto the first split body 101 by means of fittings (such as screws). This application does not impose specific restrictions on the molding method of the first locking member 25 and the first split body 101.

[0246] Correspondingly, the fixing seat 261 and the second split body 102 can also be set as an integral structure. When the fixing seat 261 and the second split body 102 are set as an integral structure, the fixing seat 261 is a part of the second split body 102. The fixing seat 261 and the second split body 102 can also be set as a separate structure. The fixing seat 261 is assembled onto the second split body 102 by means of fittings (such as screws). This application does not impose specific restrictions on the molding method of the fixing seat 261 and the second split body 102.

[0247] It should be noted that when the headrest is provided with two second structural members 200, the first part 101 is indirectly connected to the second structural member 200 that supports the user's head, and the second part 102 is indirectly connected to the second structural member 200 that the user places on the placement piece.

[0248] In this case, a positioning hole is provided on the side of the fixed base 261 opposite to the first locking member 25. When the positioning protrusion 263 is in the first state, part of the positioning protrusion 263 passes through the positioning hole and is exposed on the side of the fixed base 261 facing the first locking member 25. When the positioning protrusion 263 is in the second state, the positioning protrusion 263 disengages from the positioning hole and retracts into the fixed base 261. A positioning hole is provided on the fixing base 261. When the positioning protrusion 263 is in the first state, a portion of the positioning protrusion 263 can pass through the positioning hole and protrude from the side of the fixing base 261 facing the first locking member 25, so that the positioning protrusion 263 can be positioned by the side wall of the positioning hole. When the positioning protrusion 263 is inserted into the snap-fit ​​recess 251, it can prevent the positioning protrusion 263 from moving along the relative sliding direction of the first split 101 and the second split 102, thereby preventing the positioning protrusion 263 from shaking relative to the first locking member 25 in the relative sliding direction of the first split 101 and the second split 102, and ensuring the stability of the first structural member 100.

[0249] In actual implementation, the positioning hole may not be provided on the fixed base 261. Instead, the positioning protrusion 263 is positioned by the positioning structure. When the positioning protrusion 263 is inserted into the snap-fit ​​recess 251, the positioning structure prevents the positioning protrusion 263 from moving relative to the fixed base 261 along the relative sliding direction of the first split 101 and the second split 102.

[0250] In one feasible example, the positioning structure is set as a pin. The positioning protrusion 263 is provided with a first hole, and the fixing base 261 is provided with a second hole corresponding to the first hole. The second hole is adapted to the pin. When the positioning protrusion 263 is inserted into the snap-fit ​​recess 251, the pin passes through the first hole and is inserted into the second hole. The positioning protrusion 263 is positioned by the engagement of the pin with the first hole and the second hole, so as to prevent the positioning protrusion 263 from moving relative to the first locking member 25 along the relative sliding direction of the first split 101 and the second split 102.

[0251] In another feasible example, the positioning structure is set as an electromagnet, which is mounted on the fixed base 261. The positioning protrusion 263 is a magnetic attractor that can be attracted by the electromagnet. When the positioning protrusion 263 is inserted into the locking recess 251, the positioning structure is energized, which allows the positioning structure to attract the positioning protrusion 263. Under the action of the magnetic attraction, the positioning structure prevents the positioning protrusion 263 from moving relative to the first locking member 25 along the relative sliding direction of the first split 101 and the second split 102.

[0252] It should be noted that there are many positioning structures that can prevent the positioning protrusion 263 from moving relative to the fixed base 261 along the relative sliding direction of the first split 101 and the second split 102. The specific structures of the positioning structures will not be listed here.

[0253] In one example, the second slider 262 includes a sliding body 2621 and a push-in portion 2622 and a push-top portion 2623, both connected to the sliding body 2621. The sliding body 2621 is slidably connected to the fixed base 261, and the sliding body 2621 and the fixed base 261 are disposed opposite to each other, with the push-in portion 2622 and the push-top portion 2623 both located on the side of the sliding body 2621 opposite to the fixed base 261. When the fixed base 261 is provided with a positioning hole, the push-in portion 2622 is used to push the positioning protrusion 263 into the positioning hole, and the push-top portion 2623 is used to push the positioning protrusion 263 to keep the positioning protrusion 263 in a first state. When the sliding body 2621 slides relative to the fixed base 261 and drives the push-in part 2622 to move towards the positioning hole, the push-in part 2622 pushes part of the positioning protrusion 263 into the positioning hole, so that the positioning protrusion 263 is inserted into the locking recess 251, thereby locking the first split 101 and the second split 102. As the sliding body 2621 continues to slide, it drives the push-top 2623 to contact the positioning protrusion 263 and push the positioning protrusion 263, so that the positioning protrusion 263 is kept in the first state, preventing the positioning protrusion 263 from disengaging from the locking recess 251 and causing the first split 101 and the second split 102 to be accidentally unlocked, thus ensuring the reliability of the first split 101 and the second split 102.

[0254] The first locking member 25 is an elastic body. It always tends to drive the positioning protrusion 263 towards the fixed base 261, causing the positioning protrusion 263 to disengage from the positioning hole, thus allowing the positioning protrusion 263 to switch from a first state to a second state. When the pushing top 2623 pushes the positioning protrusion 263, it overcomes the elastic preload of the first locking member 25, keeping the positioning protrusion 263 inserted into the locking recess 251. When the sliding body 2621 slides relative to the fixed base 261, it can drive the pushing top 2623 away from the positioning hole, causing it to disengage from the positioning protrusion 263. Under the action of the elastic preload of the first locking member 25, it pushes the positioning protrusion 263 in the locking recess 251 towards the fixed base 261, causing the positioning protrusion 263 to disengage from the locking recess 251 and the positioning hole and enter the fixed base 261. Understandably, after the positioning protrusion 263 disengages from the snap-fit ​​recess 251 and the positioning hole, the positioning of the positioning protrusion 263 is released, allowing the positioning protrusion 263 to retract into the fixing seat 261. At this time, the positioning protrusion 263 is in the second state.

[0255] In this example, the first locking member 25 is made of a material with a certain elasticity, such as plastics like polyamide (PA), polycarbonate (PC), and polypropylene (PP), or metals like spring steel (Mn), stainless steel (e.g.), and aluminum alloy (e.g.), so that the first locking member 25 has the ability to elastically deform. When both the push top 2623 and the push-in part 2622 are separated from the positioning protrusion 263, the first locking member 25 can drive the positioning protrusion 263 to move toward the fixing seat 261, so that the positioning protrusion 263 can automatically disengage from the positioning hole and the locking recess 251.

[0256] Understandably, the positioning protrusion 263 has a first end and a second end opposite to the first end. When the positioning protrusion 263 is inserted into the snap-fit ​​recess 251, the first end of the positioning protrusion 263 passes through the positioning hole and protrudes from the side of the fixing seat 261 facing the first locking member 25. The second end of the positioning protrusion 263 is located inside the fixing seat 261, and the weight of the second end of the positioning protrusion 263 is greater than the weight of the first end. When both the push top 2623 and the push-in part 2622 are separated from the positioning protrusion 263, the second sliding member 262 exerts no force on the positioning protrusion 263. Since the weight of the second end of the positioning protrusion 263 is greater than the weight of the first end, the positioning protrusion 263 can also be disengaged from the positioning hole and retracted into the fixing seat 261 under the action of eccentric force. Furthermore, when the positioning protrusion 263 is inserted into the snap-fit ​​recess 251, the pusher 2623 pushes the positioning protrusion 263 to keep the positioning protrusion 263 in the positioning hole. When the sliding body 2621 slides relative to the fixed seat 261, the pusher 2623 and the positioning protrusion 263 make contact movement, so that there is friction between the pusher 2623 and the positioning protrusion 263. Under the action of friction, the positioning protrusion 263 can also exit the positioning hole and enter into the fixed seat 261.

[0257] In one example, the sliding body 2621 is further provided with a clearance recess 2627 located at the end of the push-in portion 2622 away from the push-top 2623. When the push-top 2623 disengages from the positioning protrusion 263, the positioning protrusion 263 can move to the clearance recess 2627. By providing the clearance recess 2627 on the sliding body 2621, when the positioning protrusion 263 exits from the positioning hole and enters the clearance recess 2627, positional interference between the sliding body 2621 and the positioning protrusion 263 is prevented, allowing the positioning protrusion 263 to smoothly retract into the fixed seat 261.

[0258] Furthermore, along the direction from the relief recess 2627 to the push top 2623, the push-in portion 2622 gradually tilts from the bottom of the relief recess 2627 toward the opening end of the relief recess 2627, so that the push-in portion 2622 forms an inclined structure. During the process of the second slider 262 pushing the positioning protrusion 263 into the positioning hole, the positioning protrusion 263 can smoothly enter the positioning hole along the inclined direction of the push-in portion 2622.

[0259] It should be noted that, in actual implementation, the avoidance recess 2627 may not be provided on the sliding body 2621. In a feasible example, an elastic structure, such as a sponge layer, is provided at the end of the sliding body 2621 located away from the push top 2623 of the push-in portion 2622. When the push top 2623 disengages from the positioning protrusion 263, under the action of the elastic pre-tightening force of the first locking member 25, the first locking member 25 pushes the positioning protrusion 263, causing the positioning protrusion 263 to move towards the interior of the fixed seat 261 until the positioning protrusion 263 compresses and deforms the elastic structure, thereby allowing it to enter the fixed seat 261.

[0260] In some embodiments, when a positioning hole is provided on the fixed base 261, the second sliding member 262 further includes a sixth elastic member (not shown in the figure). The sixth elastic member always has the tendency to drive the positioning protrusion 263 out of the positioning hole. When the push top 2623 pushes the positioning protrusion 263, the positioning protrusion 263 remains in the positioning hole. When the push top 2623 disengages from the positioning protrusion 263, the sixth elastic member drives the positioning protrusion 263 out of the positioning hole and back into the fixed base 261, thereby releasing the locking of the first split 101 and the second split 102.

[0261] In one example, the positioning protrusion 263 is connected to the wall of the positioning hole via a sixth elastic element. The sixth elastic element is an elastic sleeve, which is sleeved on the outer periphery of the positioning protrusion 263, and a portion of the positioning protrusion 263 protrudes beyond the sixth elastic element, so that the portion of the positioning protrusion 263 protruding beyond the sixth elastic element can be engaged in the engaging recess 251, thereby locking the first split 101 and the second split 102.

[0262] In another example, the positioning protrusion 263 is connected to the sliding body 2621 via a sixth elastic member. This design, even when the first locking member 25 is a non-elastic structure 291, allows the positioning protrusion 263 to exit the positioning hole and retract into the fixing seat 261 when the push top 2623 disengages from the positioning protrusion 263. Therefore, the first locking member 25 is not limited to an elastic body; it can also be a non-elastic body.

[0263] Combination Figure 44 and Figure 45The fixed base 261 includes a base body 2612 and a fixed plate 2611 connected to the base body 2612. The fixed plate 2611 is set at an angle to the base body 2612. In this example, the fixed plate 2611 is perpendicular to the base body 2612, that is, the fixed plate 2611 is set at 90° to the base body 2612. Of course, in other examples, the angle between the fixed plate 2611 and the base body 2612 can be flexibly adjusted as needed. There is no specific limitation on the angle between the fixed plate 2611 and the base body 2612 here. The sliding body 2621 is slidably connected to the base body 2612. The fixed plate 2611 is disposed between the sliding body 2621 and the first locking member 25. The sliding body 2621 and the fixed plate 2611 are spaced apart. The push-in part 2622, the push top 2623 and the avoidance recess 2627 are all disposed on the side of the sliding body 2621 facing the fixed plate 2611. When the positioning protrusion 263 is inserted into the snap-fit ​​recess 251, a portion of the positioning protrusion 263 protrudes into the gap between the sliding body 2621 and the fixing plate 2611, allowing the pusher 2623 to push it. The length direction of the seat body 2612 is parallel to the length direction of the first structural member 100, and the sliding body 2621 can slide relative to the seat body 2612 along its length direction, which is parallel to the direction indicated by arrow X2 in the figure.

[0264] See Figure 44The second locking member 26 includes a first limiting body and a second limiting body. The first limiting body is disposed on one of the fixed base 261 and the second sliding member 262, and the second limiting body is disposed on the other of the fixed base 261 and the second sliding member 262. The first limiting body is provided with a first limiting hole 2613, the length direction of which is parallel to the sliding direction of the second sliding member 262 relative to the fixed base 261. The second limiting body is provided with a first limiting protrusion 2625, a portion of which is disposed in the first limiting hole 2613, and the first limiting protrusion 2625 is movable relative to the first limiting body along the length direction of the first limiting hole 2613. In this example, the first limiting body is disposed on the sliding body 2621 of the second sliding member 262, and the second limiting body is disposed on the seat body 2612 of the fixed base 261. When the sliding body 2621 can slide relative to the base body 2612 along its length direction, the length direction of the first limiting hole 2613 is parallel to the length direction of the base body 2612. Along the length direction of the base body 2612, the size of the first limiting hole 2613 is larger than the size of the first limiting protrusion 2625, allowing the first limiting protrusion 2625 to move along the length of the base body 2612 within the first limiting hole 2613. Since the length direction of the first limiting hole 2613 is parallel to the length direction of the base body 2612, a portion of the first limiting protrusion 2625 is disposed within the first limiting hole 2613. When the sliding body 2621 slides along the length direction of the base body 2612, it drives the first limiting protrusion 2625 to move within the first limiting hole 2613, thus limiting the travel distance of the second sliding member 262 relative to the fixed base 261.

[0265] It can be explained that the first limiting hole 2613 can be either a blind hole or a through hole. When the first limiting hole 2613 is a blind hole, it is located on the side of the seat body 2612 or sliding body 2621 facing the second limiting body, and one end of the first limiting protrusion 2625 is disposed in the first limiting hole 2613. When the first limiting hole 2613 is a through hole, it penetrates the seat body 2612 or sliding body 2621, and one end of the first limiting protrusion 2625 passes through the first limiting hole 2613 and protrudes from the seat body 2612 or sliding body 2621.

[0266] In this example, the first limiting body is disposed on the seat body 2612, and the second limiting body is disposed on the sliding body 2621.

[0267] In actual implementation, the positions of the first limiting body and the second limiting body can be interchanged as needed, that is: the first limiting body is set on the sliding body 2621 and the second limiting body is set on the seat body 2612.

[0268] In this example, the first limiting body and the second limiting body form a limiting structure. There are four limiting structures. The four limiting structures are combined in pairs to form two limiting groups. The two limiting groups are distributed at intervals along the width direction of the seat body 2612. The two limiting structures in the same group are distributed at intervals along the length direction of the seat body 2612. By distributing the four limiting structures in this way, multiple positions of the sliding body 2621 can be limited, which improves the limiting effect of the sliding body 2621 and helps to maintain the movement balance of the second sliding member 262 and prevent the second sliding member 262 from tilting relative to the fixed seat 261.

[0269] Of course, in actual implementation, the number of limit structures can be set according to actual needs, such as setting the number of limit structures to one, two, three or five, etc.

[0270] It should be noted that the positions of the first and second limiting bodies in each limiting structure can be interchanged as needed. That is, the first limiting body in the limiting structure can be set on the sliding body 2621, and the second limiting body in the limiting structure can be set on the seat body 2612. There is no specific restriction on the position of the first and second limiting bodies.

[0271] When the first limiting body is provided on the base body 2612, the base body 2612 is provided with a locking surface 2614 on one side of the limiting hole. The first limiting protrusion 2625 protrudes and is provided with a locking part 2626 that engages with the locking surface 2614. The length direction of the locking surface 2614 is parallel to the length direction of the limiting hole. The locking part 2626 can slide relative to the locking surface 2614 along the length direction of the locking surface 2614. In this way, the first limiting protrusion 2625 can engage with the locking surface 2614 through the locking part 2626 to prevent the second sliding member 262 from separating from the fixed base 261. Furthermore, under the cooperation and sliding of the locking part 2626 and the locking surface 2614, the second sliding member 262 can slide relative to the fixed base 261.

[0272] In another example, when the second limiting body is provided on the seat body 2612, the sliding body 2621 is provided with a snap-fit ​​surface 2614 on one side of the first limiting hole 2613, and the first limiting protrusion 2625 is provided with a snap-fit ​​part 2626 that engages with the snap-fit ​​surface 2614. The length direction of the snap-fit ​​surface 2614 is parallel to the length direction of the first limiting hole 2613. The snap-fit ​​part 2626 can slide relative to the snap-fit ​​surface 2614 along the length direction of the snap-fit ​​surface 2614. In this way, the fixed seat 261 and the second sliding member 262 can also be assembled into a whole, and the second sliding member 262 can also slide relative to the fixed seat 261 under the cooperation and sliding of the snap-fit ​​part 2626 and the snap-fit ​​surface 2614.

[0273] Of course, in actual implementation, the second sliding member 262 can also be slidably connected to the fixed base 261 through other structures. No specific restrictions are placed on the structure for achieving the slidable connection between the second sliding member 262 and the fixed base 261. For example, one of the sliding body 2621 and the base body 2612 can be provided with a third slide rail, the length direction of which is parallel to the length direction of the base body 2612. The other of the sliding body 2621 and the base body 2612 can be provided with a third slider. Through the cooperation of the third slider and the third slide rail, the second sliding member 262 can also slide relative to the fixed base 261.

[0274] To facilitate the user's pushing of the second slider 262 relative to the fixed base 261 from the outside of the first structural member 100, the second slider 262 also includes a pushing protrusion 2624. The pushing protrusion 2624 is connected to the sliding body 2621 and protrudes from the outside of the first split 101 or the second split 102. Since the pushing protrusion 2624 is connected to the sliding body 2621, pushing the pushing protrusion 2624 from the outside of the first split 101 or the second split 102 can drive the second slider 262 to move relative to the fixed base 261. It should be noted that the pushing protrusion 2624 can be directly connected to the sliding body 2621, or it can be indirectly connected to the sliding body 2621 through other structures. Any connection method that can drive the sliding body 2621 to move when the pushing protrusion 2624 is pushed is acceptable.

[0275] Of course, if at least a portion of the sliding body 2621 is exposed outside the first split 101 or the second split 102, the second slider 262 may not be provided with the push protrusion 2624. In this case, the user can directly push the portion of the sliding body 2621 exposed outside the first split 101 or the second split 102.

[0276] In one example, the second locking member 26 further includes a seventh elastic member 264, which is connected to the fixed base 261 and the second sliding member 262. The seventh elastic member 264 always has the tendency to drive the second sliding member 262 to push the positioning protrusion 263 into the locking recess 251, so that the positioning protrusion 263 is in the first state. After the length of the first structural member 100 is adjusted, the elastic restoring force of the seventh elastic member 264 can drive the second sliding member 262 to push the positioning protrusion 263 into the locking recess 251, thereby automatically locking the first split 101 and the second split 102, improving the ease of operation.

[0277] In actual implementation, when the positioning protrusion 263 is connected to the wall of the positioning hole via the sixth elastic member, and the elastic restoring force of the seventh elastic member 264 drives the second sliding member 262 to push the positioning protrusion 263 into the locking recess 251, it is necessary to ensure that the pushing force of the pusher 2623 on the second sliding member 262 on the positioning protrusion 263 is greater than or equal to the elastic preload force of the sixth elastic member on the positioning protrusion 263, so that the positioning protrusion 263 can remain inserted into the locking recess 251. When the user applies force to push the second sliding member 262 to overcome the elastic restoring force of the seventh elastic member 264, since the elastic restoring force of the seventh elastic member 264 no longer acts on the positioning protrusion 263 through the second sliding member 262, the positioning protrusion 263 exits the positioning hole and retracts into the clearance recess 2627 under the action of the sixth elastic member.

[0278] The second locking member 26 also includes a first positioning body 265 and a second positioning body 266. The first positioning body 265 is connected to the fixed base 261, and the second positioning body 266 is connected to the second sliding member 262. The second positioning body 266 and the second positioning body 266 are spaced apart along the relative sliding direction between the second sliding member 262 and the fixed base 261. In this example, the second positioning body 266 and the second positioning body 266 are spaced apart along the length direction of the first structural member 100. The second positioning body 266 is connected to the sliding body 2621 of the second sliding member 262. The seventh elastic member 264 is connected between the first positioning body 265 and the second positioning body 266. The first positioning body 265 and the second positioning body 266 provide positioning and support for the seventh elastic member 264 to facilitate its installation.

[0279] Furthermore, the fixing base 261 is provided with a fifth fixing hole 2615. The first positioning body 265 protrudes from one side of the fixing base 261 and is at least partially disposed in the fifth fixing hole 2615. The second positioning body 266 is disposed in the fifth fixing hole 2615 on one wall of the hole along the length direction of the first structural member 100. The seventh elastic member 264 is installed in the fifth fixing hole 2615. In this example, the base body 2612 of the fixing base 261 is provided with the fifth fixing hole 2615. The fifth fixing hole 2615 provides a receiving space for the installation of the seventh elastic member 264, improving the structural compactness of the second locking member 26.

[0280] In this example, the seventh elastic element 264 is a spring. Of course, the seventh elastic element 264 is not limited to a spring. In other examples, the seventh elastic element 264 can also be an elastic sheet, or any component that can provide elastic restoring force.

[0281] In one example, the positioning protrusion 263 is a sphere with a smooth, rounded surface, preventing any jamming during its insertion and removal from the positioning hole and improving the smoothness of its movement. In other examples, the shape of the positioning protrusion 263 can be adjusted as needed, for example, it can be a rod-shaped body, a cuboid, or an irregular structure. No specific limitations are placed on the shape of the positioning protrusion 263 here.

[0282] See Figure 42 A first locking member 25 is disposed on a first split body 101, a second locking member 26 is disposed on a second split body 102, and a fixing seat 261 is connected to the second split body 102. A first groove 1011 is provided at one end of the first split body 101 along its length, and the first locking member 25 is disposed on the groove sidewall of the first groove 1011. A second groove 106 is provided at one end of the second split body 102 along its length, and the fixing seat 261 of the second locking member 26 is disposed in the second groove 106 and spaced apart from the groove sidewall of the second groove 106. One end of the fixing seat 261 is connected to the bottom of the groove of the second groove 106. The portion of the first split body 101 with the first groove 1011 is movably disposed in the second groove 106. A gap 27 exists between the second locking member 26 and the groove sidewall of the second groove 106, and both the groove sidewall of the first groove 1011 and the first locking member 25 are located in the gap 27. The second locking member 26 is partially disposed in the second groove 106, and the groove sidewall of the first groove 1011 and the first locking member 25 are both located in the gap 27 between the second locking member 26 and the groove sidewall of the second groove 106. On the one hand, the first locking member 25 and the second locking member 26 can be partially hidden inside the first structural member 100, preventing external dust and other foreign objects from contaminating the first locking member 25 and the second locking member 26 and affecting the normal use of the first structural member 100, and also improving the structural compactness of the first structural member 100. On the other hand, the first split 101 can be limited by the second locking member 26 and the groove sidewall of the second groove 106, preventing the sliding paths of the first split 101 and the second split 102 from deviating.

[0283] In actual implementation, the end of the first split 101 away from the first groove 1011 is connected to the second structural member 200 used as a head support, and the end of the second split 102 away from the second groove 106 is connected to the second structural member 200 used as a base.

[0284] In one example, two first locking members 25 are provided, each located on one of the opposite sidewalls of the first groove 1011. Two positioning protrusions 263 are also provided, each corresponding to one of the first locking members 25. Each positioning protrusion 263 can be inserted into any of the corresponding snap-fit ​​recesses 251 of the first locking member 25. In this example, the fixing base 261 has positioning holes corresponding to the opposite sides of each of the two first locking members 25, and these two positioning holes correspond to the two positioning protrusions 263. By providing two first locking members 25, two positioning protrusions 263, and two positioning holes, the second locking member 26 can engage with the first locking members 25 on the two sidewalls of the first groove 1011 to lock, thereby enhancing the locking force on both the first locking members 25 and the second locking member 26 and improving the load-bearing capacity of the first structural member 100. Furthermore, since the two first locking members 25 are opposite each other, after locking the first split 101 and the second split 102, the locking force of the first structural member 100 is kept balanced, which helps to ensure the locking effect of the first split 101 and the second split 102.

[0285] In this example, the width direction of the first groove 1011 is parallel to the width direction of the first structural member 100, and the two first locking members 25 are respectively disposed on the two sidewalls of the groove in the width direction of the first groove 1011. The width direction of the first groove 1011 is parallel to the direction indicated by arrow Y2 in the figure.

[0286] Furthermore, when the fixing base 261 includes fixing plates 2611, there are two fixing plates 2611, which are arranged on both sides of the base body 2612 in the width direction, and each fixing plate 2611 is provided with a positioning hole.

[0287] Of course, in other examples, the two first locking members 25 can be respectively disposed on the two groove walls in the thickness direction of the first groove 1011. Alternatively, the number or specific position of the first locking members 25 can be flexibly adjusted as needed, and there are no specific limitations on the number and specific position of the first locking members 25 here.

[0288] When the second slider 262 includes a push protrusion 2624, the groove sidewall of the second groove 106 is provided with a second clearance hole 1061. The second clearance hole 1061 connects the second groove 106 with the outside of the second split body 102. The end of the push protrusion 2624 away from the sliding body 2621 passes through the second clearance hole 1061 and protrudes out of the outside of the second split body 102. In this way, the user can push the push protrusion 2624 from the outside of the first structural member 100 to realize the relative sliding of the second slider 262 and the fixed seat 261.

[0289] In this example, the seat body 2612 is provided with a second connecting hole (not shown in the figure), the push protrusion 2624 protrudes from one side of the sliding body 2621, the second connecting hole connects the second clearance hole 1061 and one side of the sliding body 2621, and one end of the push protrusion 2624 passes through the second connecting hole and the second clearance hole 1061 in sequence and protrudes from the outside of the second split body 102.

[0290] In some feasible examples, it is not necessary to provide a first groove 1011 in the first segment 101 and a second groove 106 in the second segment 102 to achieve the length adjustment of the first structural member 100 and the locking of the first segment 101 and the second segment 102. For example, the first segment 101 is located on one side of the second segment 102, the third locking component is located between the first segment 101 and the second segment 102, the first locking component 25 is located on the side of the first segment 101 facing the second segment 102, and the fixing seat 261 of the second locking component 26 is located on the side of the second segment 102 facing the first segment 101. That is, it is not necessary to provide a first groove 1011 in the first segment 101 and a second groove 106 in the second segment 102 to achieve the length adjustment of the first structural member 100 and the locking of the first segment 101 and the second segment 102.

[0291] In the headrest of this application, when there are two second structural members 200 and two pivots 301, the pivots 301 at both ends of the length of the first structural member 100 are parallel to each other. This design prevents the two pivots 301 from interfering with each other when the headrest is folded. Furthermore, when the headrest is stored, the two second structural members 200 can be fitted as close as possible to the opposite sides of the first structural member 100, which helps to reduce the overall space occupied by the headrest.

[0292] Some embodiments of the headrest, see [link / reference] Figure 1 and Figure 2 When the headrest has two second structural members 200, and a rotating member 300 is connected between the first structural member 100 and each of the two second structural members 200, combined with Figure 3 and Figure 4Both rotating components 300 include a connecting block 302 and a rotating shaft 301 passing through the connecting block 302. The connecting block 302 of one rotating component 300 is disposed on one of the second structural components 200, and the connecting block 302 of the other rotating component 300 is disposed on the other second structural component 200. The second structural component 200 for supporting the user's head is provided with a first front face 1a and a first back face 1c opposite to the first front face 1a. The first front face 1a contacts the user's head, and the first back face 1c is provided with a first connecting position, which connects to the connecting block 302 of one of the rotating components 300. The second structural member 200, which is placed on the placement member, has a second front face 1b and a second back face 1d located between the top and bottom. The second front face 1b faces the user, and the second back face 1d faces away from the user. The top of the second structural member 200 is provided with a second connecting position, which connects to the connecting block 302 of another rotating member 300. Along the direction from the second back face 1d to the second front face 1b, the first connecting position and the second connecting position are distributed at intervals, and the first connecting position is closer to the second front face 1b relative to the second connecting position. In this type of headrest, the first connecting position on the head support is closer to the second front side 1b than the second connecting position. When the headrest is in the open state, the second structural member 200 supporting the user's head is closer to the user to support the user's head and prevent interference with the second structural member 200 placed on the placement member. When the headrest is in the open state, it forms a "Z" shaped structure. By setting the first connecting position close to the second front side 1b and the second connecting position close to the second back side 1d, when the headrest is folded, the two second structural members 200 can be respectively attached to the opposite sides of the first structural member 100, reducing the gap 27 between the two second structural members 200 and the first structural member 100, and reducing the overall space occupied by the folded headrest.

[0293] In some embodiments of the headrest, see Figure 46 and Figure 47 When the second structural member 200 is used to be placed on the placement member, the second structural member 200 includes a base 31 and a second seat body 28. The base 31 is used to be placed on the placement member, and the second seat body 28 is connected to the first structural member 100. The second seat body 28 is disposed on the base 31 and rotatably connected to the base 31 so that the second seat body 28 can rotate relative to the base 31 about its own axis. When the second seat body 28 rotates relative to the base 31, it can drive the first structural member 100 to rotate relative to the base 31.

[0294] By rotatably connecting the second main body 28 to the base 31, the second main body 28 can rotate relative to the base 31 around its axis. This allows the user to adjust the direction of the second structural member 200 supporting their head without moving their body, finding the most comfortable resting posture or adapting to different work environments. This greatly enhances the flexibility of the headrest and improves the user experience. This structure allows the user to easily adjust the direction of the second structural member 200 supporting their head, finding the most suitable angle for resting or working without moving the entire headrest, effectively improving user comfort and convenience.

[0295] In this example, the maximum angle at which the second main body 28 can rotate relative to the base 31 around its own axis is set to 360°, so that the user can flexibly rotate the second structural member 200 used to support the user's head according to their own usage habits or the needs of the working environment. In actual implementation, the maximum angle at which the second main body 28 can rotate relative to the base 31 around its own axis can also be flexibly adjusted as needed, for example, set to 90°, 180°, 270°, etc. There is no specific limitation on the maximum angle at which the second main body 28 can rotate relative to the base 31 around its own axis.

[0296] In one example, combined Figure 47 and Figure 52 The second structural member 200, used for placement on the placement member, also includes an adapter 30. The second main body 28, near the base 31, has a hole structure 2813 adapted to the adapter 30. The centerline of the hole structure 2813 and the axis of the adapter 30 both coincide with the axis of the second main body 28. One end of the adapter 30 is connected to the base 31, and the other end is movably disposed in the hole structure 2813. The second main body 28 can rotate relative to the adapter 30 around its own axis. Connecting one end of the adapter 30 to the base 31 fixes the adapter 30 relative to the base 31. Since the adapter 30 is adapted to the hole structure 2813, and the center line of the hole structure 2813 and the axis of the adapter 30 are both coincident with the axis of the second body 28, the adapter 30 can provide positioning for the rotation of the second body 28 when the second body 28 rotates relative to the adapter 30 around its own axis, so that the second body 28 can rotate smoothly relative to the base 31.

[0297] The hole structure 2813 can be a through hole or a blind hole. Furthermore, the hole structure 2813 is circular.

[0298] The adapter 30 is connected to the base 31 by screws, thus fixing the adapter 30 to the base 31. Of course, in actual implementation, the adapter 30 can also be welded to the base 31, or the adapter 30 and the base 31 can be an integral structure, or the adapter 30 can be connected to the base 31 through other structures. There are no specific restrictions on the connection structure between the adapter 30 and the base 31.

[0299] Combination Figure 50 and Figure 51 The second structural member 200 for placement on the restoring component also includes a third limiting member 29, which is disposed on the base 31. The second seat body 28 has multiple locking positions 2812, which are distributed sequentially at intervals around the axis of the second seat body 28. The third limiting member 29 can be locked into any of these locking positions 2812. By locking the third limiting member 29 into the locking position 2812, the third limiting member 29 can apply a damping effect to the relative rotation of the second seat body 28 and the base 31, requiring a greater rotational driving force to rotate the second seat body 28, thus preventing accidental rotation of the second seat body 28 on the base 31 and affecting the normal use of the headrest.

[0300] In one example, the third limiting member 29 includes an elastic structure 291 and a snap-fit ​​block 292. The snap-fit ​​block 292 is connected to the base 31 through the elastic structure 291. The elastic structure 291 always has a tendency to drive the snap-fit ​​block 292 toward the snap-fit ​​position 2812. The end of the snap-fit ​​block 292 away from the elastic structure 291 is used to snap into the snap-fit ​​position 2812. The elastic structure 291 has the ability to elastically deform. When the user applies a rotational driving force to the second main body 28, the elastic structure 291 is compressed under the push of the second main body 28, causing the locking block 292 to disengage from the locking position 2812, allowing the second main body 28 to rotate relative to the base 31 around its own axis. When the second main body 28 rotates to the appropriate position, the rotational driving force on the second main body 28 is removed. Under the action of elastic force, the elastic structure 291 can drive the locking block 292 into the locking position 2812, preventing the second main body 28 from rotating accidentally. In actual implementation, during the rotation of the second main body 28 relative to the base 31, the locking block 292 continuously disengages and enters the locking position 2812 it passes through under the push of the second main body 28, thus continuously producing a clicking sound when rotating the second main body 28.

[0301] When the third limiting member 29 includes the elastic structure 291, the base 31 has a first mounting groove 311 on the side facing the second main body 28. At least a portion of the elastic structure 291 is disposed in the first mounting groove 311. The base 31 has an opening communicating with the first mounting groove 311 and opposite to the locking position 2812. One end of the locking block 292 is disposed in the first mounting groove 311 and connected to the elastic structure 291, while the other end passes through the opening. The end of the locking block 292 protruding from the opening can be locked into the locking position 2812. The first mounting groove 311 facilitates the installation of the elastic structure 291. Furthermore, since the end of the locking block 292 away from the elastic structure 291 passes through the opening, the movement of the locking block 292 can be guided through this opening during the process of the locking block 292 exiting or entering the locking position 2812, reducing the risk of the locking block 292 deviating from its movement direction.

[0302] In one feasible example, the elastic structure 291 is a spring, but it is not limited to a spring; it can also be an elastic sheet or other structures.

[0303] Combination Figure 49 The second main body 28 has multiple second limiting protrusions 2811 on the side facing the base 31. These protrusions are spaced apart and arranged sequentially around the axis of the second main body 28, with adjacent protrusions forming a locking position 2812. This design makes the second limiting protrusions 2811 and the second main body 28 an integral structure, reducing the machining difficulty of the locking positions 2812. The multiple second limiting protrusions 2811 encircle the axis of the second main body 28. In this example, the second limiting protrusions 2811 are toothed, forming an internal toothed ring structure on the second main body 28.

[0304] Of course, in actual implementation, multiple recessed structures can also be recessed on the second main body 28. The multiple recessed structures are distributed sequentially and at intervals around the axis of the second main body 28, and the recessed structures form a snap-fit ​​position 2812. In this application, no specific restrictions are placed on the structure of the snap-fit ​​position 2812.

[0305] In another feasible example, the third limiting member 29 can also be configured as an elastic snap-fit ​​member. One end of the third limiting member 29 is connected to the base 31, and the other end is used to snap into the snap-fit ​​position 2812. The third limiting member 29 has the ability to elastically deform. When the second base body 28 is not rotating, one end of the third limiting member 29 is snapped into the snap-fit ​​position 2812. When a rotational driving force is applied to the second base body 28, the second base body 28 pushes the third limiting member 29 to contract and deform, so that the third limiting member 29 exits the snap-fit ​​position 2812, thereby allowing the second base body 28 to rotate relative to the base 31. When the rotational driving force is removed, the third limiting member 29 returns to its original deformation, thereby automatically snapping into the snap-fit ​​position 2812. The structure of the third limiting member 29 in this configuration is simple and helps to reduce the manufacturing difficulty of the base.

[0306] In another feasible example, the third limiting member 29 is set as a pin, and multiple second limiting holes (not shown in the figure) are provided on the side of the second body 28 facing the base 31. The multiple second limiting holes are spaced apart around the axis of the second body 28. Multiple third limiting holes are provided on the base 31. The multiple third limiting holes are spaced apart around the axis of the second body 28. After adjusting the appropriate position in the second body 28, the third limiting member 29 is inserted into one of the second limiting holes and one of the third limiting holes. In this way, the third limiting member 29 can also provide a damping effect on the relative rotation between the second body 28 and the base 31.

[0307] In another feasible example, the third limiting member 29 is set as a damping body, and the third limiting member 29 abuts between the adapter 30 and the groove sidewall of the hole structure 2813. In this way, the third limiting member 29 can also provide damping effect on the relative rotation of the second main body 28 and the base 31.

[0308] It should be noted that there are many structures for the third limiting member 29, which will not be listed here. Any structure that can provide damping for the relative rotation of the second main body 28 and the base 31 is acceptable.

[0309] In one example, see Figure 53 and Figure 54The substrate 31 and the second main body 28 each have a fourth positioning post 18 and a second positioning groove 284. The second positioning groove 284 is annular, and its center line coincides with the axis of the second main body 28. The fourth positioning post 18 is movably disposed in the second positioning groove 284 and can slide relative to the sidewall of the groove 284 around the axis of the second main body 28. A damping layer 285 is disposed in the second positioning groove 284, abutting against the sidewall of the groove 284 and the fourth positioning post 18. The fourth positioning post 18 is disposed on the substrate 31, and the second positioning groove 284 is disposed on the second main body 28. Three fourth positioning posts 18 are provided, spaced apart on the substrate 31 around the axis of the second main body 28. In actual implementation, the number of fourth positioning posts 18 can be flexibly set as needed, and no specific limit is placed on the number of fourth positioning posts 18 here. Since the center line of the second positioning groove 284 coincides with the axis of the second main body 28, when the second main body 28 rotates relative to the base 31 around its own axis, the fourth positioning post 18 slides relative to the second main body 28 in the second positioning groove 284 along the extension path of the second positioning groove 284. In this way, with the cooperation of the fourth positioning post 18 and the second positioning groove 284, the second main body 28 can be positioned, preventing the rotation trajectory of the second main body 28 from deviating. A damping layer 285 is provided on the groove sidewall of the second positioning groove 284 and the fourth positioning post 18. The damping layer 285 can apply a damping effect to the relative rotation of the second main body 28 relative to the base 31, so that the second main body 28 requires a larger rotational driving force to rotate relative to the base 31.

[0310] To reduce wear on the fourth positioning post 18 caused by the damping layer 285, the damping layer 285 is designed as an elastic structure, giving it the ability to deform elastically. When the fourth positioning post 18 slides in the second positioning groove 284, the damping layer 285 can undergo elastic deformation, reducing wear on the fourth positioning post 18 and extending its service life.

[0311] In actual implementation, the fourth positioning post 18 can also be set on the side of the second main body 28 facing the base 31, and the second positioning groove 284 can be set on the base 31.

[0312] In some embodiments, the base also includes a rotating gear (not shown in the figure), which is rotatably connected to the base 31. An internal gear ring is provided on the side of the second base body 28 facing the base 31. The axis of the internal gear ring coincides with the axis of the second base body 28, and the axis of the internal gear ring is spaced apart from and parallel to the axis of the rotating gear. This design makes the radial gear of the rotating gear smaller than the size of the internal gear ring, which allows a smaller motor to drive the rotating gear to rotate and reduces the rotational speed of the second base body 28. This is beneficial to reduce the rotational speed of the second base body 28 relative to the base 31. In addition, the second base body 28 will only rotate relative to the base 31 when the rotating gear is driven by the motor, so there is no need to set an additional third limiting member 29 to apply damping to the relative rotation of the second base body 28 relative to the base 31.

[0313] The base also includes ball bearings (not shown in the figure), which connect the second main body 28 and the base 31. The opposite sides of the ball bearings roll in contact with the second main body 28 and the base 31. The side of the base 31 facing the second main body 28 has multiple spherical grooves, each containing a ball bearing. One end of each ball bearing abuts against the second main body 28. When the second main body 28 rotates relative to the base 31, it causes the ball bearings to roll within the spherical grooves. The action of the ball bearings reduces the friction between the second main body 28 and the base 31, thereby reducing wear on both the base 31 and the second main body 28.

[0314] To reduce the risk of displacement of the base on the placement component, an anti-slip pad is provided on the side of the base 31 that contacts the placement component. The anti-slip pad effectively prevents unnecessary displacement of the headrest during use.

[0315] The second main body 28 includes a support frame 282 and a chassis frame 281. The support frame 282 and the base 31 are respectively disposed on opposite sides of the chassis frame 281, and the chassis frame 281 can rotate relative to the adapter 30. When a hole structure 2813 is provided on the second main body 28, the hole structure 2813 is disposed on the chassis frame 281 and penetrates through the chassis frame 281, making the hole structure 2813 a through hole. In actual implementation, the chassis frame 281 is detachably connected to the support frame 282 by bolts, facilitating the assembly of the chassis frame 281 and the support frame 282.

[0316] The adapter 30 includes an adapter body 3001 and a protrusion 3002 on one end of the adapter body 3001. The adapter body 3001 has a through hole structure 2813, and the end of the adapter body 3001 away from the protrusion 3002 is connected to the base 31. The protrusion 3002 protrudes outward from the adapter body 3001 and abuts against the side of the chassis frame 281 facing away from the base 31 to prevent the adapter 30 from separating from the chassis frame 281. The protrusion 3002 does not affect the rotation of the chassis frame 281 relative to the adapter 30. In this example, the adapter body 3001 is cylindrical, and the hole structure 2813 is circular, allowing the hole structure 2813 to fit the adapter body 3001.

[0317] When the second main body 28 has a chassis frame 281, the protrusion 3002 is provided on the side of the chassis frame 281 facing the base 31.

[0318] Furthermore, the second main body 28 also includes a decorative cover plate 283. The decorative cover plate 283 is disposed on the side of the support frame 282 facing away from the chassis frame 281, and the side of the decorative cover plate 283 facing away from the support frame 282 is used to connect the second structural member 200. The support frame 282 provides support for the second structural member 200, enabling the second structural member 200 to be stably mounted on the second main body 28. When the chassis frame 281 is connected to the support frame 282 by bolts, the decorative cover plate 283 is installed on the support frame 282 and covers the bolts, thus protecting the bolts and enhancing the aesthetics of the base.

[0319] Combination Figure 55 and Figure 56 When the headrest has two pivots 301, one end of the first structural member 100 along its length is rotatably connected to a second structural member 200 for supporting the user's head via one of the pivots 301, and the other end of the first structural member 100 along its length is connected to the second structural member 200 for placement on a placement piece via the other pivot 301. This allows the first structural member 100 to rotate relative to the second seat body 28 and abut against the second seat body 28. The side of the second seat body 28 facing away from the base 31 has a second receiving groove 286 adapted to the first structural member 100. When the first structural member 100 abuts against the second seat body 28, at least a portion of the first structural member 100 is received in the second receiving groove 286. When the headrest is in a folded state, at least a portion of the first structural member 100 is received in the second receiving groove 286, effectively reducing the overall height of the headrest and facilitating its storage and transportation.

[0320] When rotating members 300 are connected between the two second structural members 200 and the first structural member 100, and the second main body 28 includes a decorative cover plate 283, a second mounting groove 2831 is provided on the decorative cover plate 283, and a connecting block 302 is installed in the second mounting groove 2831. The first structural member 100 is rotatably connected to the connecting block 302 on the decorative cover plate 283 through a rotating shaft 301, so that the first structural member 100 is rotatably connected to the second main body 28.

[0321] When assembling the headrest, one end of the adapter 30 on the base 31 is abutted against the chassis frame 281, so that the base 31, adapter 30 and chassis frame 281 are assembled into a whole. Then, the connecting block 302 is inserted into the second mounting slot 2831. Fasteners are used to pass through the support frame 282 and the decorative cover plate 283 from bottom to top and then connect them to the connecting block 302, so that the connecting block 302 is fixed in the second mounting slot 2831. Then, the chassis frame 281 and the support frame 282 are connected by bolts. It can be seen that by setting the chassis frame 281 and the support frame 282 in the base, the second main body 28 can also have enough operating space when assembling the headrest, which facilitates the connection of the connecting block 302 and the second main body 28.

[0322] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0323] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A headrest, characterized in that, include: First structural component; The second structural component is used to support the user's head; A rotating shaft, through which the first structural component is rotatably connected to the second structural component; and A locking assembly, a portion of which is disposed on the rotating shaft, and another portion of which is connected to the first structural member, the locking assembly being used to restrict relative rotation between the first structural member and the second structural member.

2. The headrest according to claim 1, characterized in that, The locking assembly includes a first limiting member, a second limiting member, and a rotating gear. The first limiting member is disposed on the first structural member, and the second limiting member is fixed relative to the second structural member. The first limiting member and the second limiting member are distributed sequentially at intervals along the axial direction of the rotating shaft. The rotating gear is disposed on the outer periphery of the rotating shaft, and at least a portion of the rotating gear meshes with the second limiting member. The rotating gear is capable of moving along the axial direction of the rotating shaft toward the first limiting member until it meshes with the first limiting member to restrict the relative rotation of the first structural member and the second structural member, or moving relative to the rotating shaft away from the first limiting member until it separates from the first limiting member to release the restriction on the first structural member and the second structural member.

3. The headrest according to claim 2, characterized in that, A rotating component is connected between the first structural component and the second structural component. The rotating component includes a connecting block and a rotating shaft. The rotating shaft passes through the connecting block. The connecting block is fixed on the second structural component. The second limiting component is disposed inside the connecting block. The locking assembly further includes a first elastic element, which is disposed on the connecting block and connected to the rotating gear. The first elastic element always has the tendency to drive the rotating gear to move along the axial direction of the rotating shaft toward the first limiting element.

4. The headrest according to claim 2 or 3, characterized in that, The locking assembly further includes a pusher, which is disposed on the side of the first limiting member away from the rotating gear. The pusher can drive the rotating gear to move along the axial direction of the rotating shaft away from the first limiting member, so as to separate the rotating gear from the first limiting member.

5. The headrest according to claim 1, characterized in that, The locking assembly includes a locking member and a locking block. The locking member is disposed on the outer periphery of the rotating shaft and is circumferentially fixed relative to the rotating shaft. At least a portion of the locking block is disposed on the first structural member. The locking block is located on one side of the locking member. The locking block can move along a set straight line on the first structural member toward the locking member to engage with the locking member, thereby restricting the relative rotation of the first structural member and the second structural member. The locking block can also move along the set straight line on the first structural member away from the locking member to separate from the locking member, thereby releasing the restriction on the first structural member and the second structural member. The locking element is a first one-way gear. When the locking block engages with the locking element, it prevents the locking element from rotating in the first direction relative to the locking block, thereby limiting the reduction of the included angle between the first structural member and the second structural member. The locking block is provided with a biting surface and a guide surface, both of which are located at the end where the locking block and the locking member are biting. The biting surface can restrict the locking member from rotating relative to the locking block in the first direction, and the guide surface can guide the locking member to rotate relative to the locking block in the second direction, which is opposite to the first direction.

6. The headrest according to claim 5, characterized in that, The locking member includes multiple locking positions, which are spaced apart around the axis of the locking block. One end of the locking block can be inserted into any of the locking positions to engage with the locking member.

7. The headrest according to claim 6, characterized in that, The locking component further includes a first gear body and a plurality of locking teeth evenly arranged on the outer periphery of the first gear body. The first gear body is connected to the rotating shaft. The locking teeth are used to mesh with the locking block. The plurality of locking teeth are evenly and spaced around the axis of the first gear body. The locking position is formed between two adjacent locking teeth. The total distribution range of the locking position on the outer periphery of the first gear body is β, where 0°<β≤180°.

8. The headrest according to any one of claims 5 to 7, characterized in that, The locking assembly further includes a driving member, a control member, and a second elastic member. At least a portion of the driving member is disposed inside the first structural member. The driving member is connected to the locking block and can drive the locking block to move along the set straight line. At least a portion of the control member is exposed outside the first structural member. The control member is connected to the drive member. Both the control member and the drive member are movable relative to the first structural member. The control member can drive the drive member to move so as to drive the locking block to move along the set straight line. The second elastic element is connected to at least one of the locking block, the driving element, and the operating element, and the second elastic element always has a tendency to drive the locking block to move closer to the locking element.

9. The headrest according to claim 1, characterized in that, The locking assembly includes a second one-way gear and a first locking gear. At least a portion of the first locking gear is disposed on the second structural member. The first locking gear is located on the outer periphery of the rotating shaft. The first locking gear and the second one-way gear are distributed sequentially along the axial direction of the rotating shaft, and the second one-way gear is rotatable relative to the rotating shaft. The axial movement of the rotating shaft can drive the first locking gear to move toward the second one-way gear until the first locking gear meshes with the second one-way gear, thereby restricting the rotation of the second one-way gear relative to the rotating shaft. The axial movement of the rotating shaft can drive the first locking gear to move away from the second one-way gear until the first locking gear separates from the second one-way gear, thereby releasing the restriction on the second one-way gear; The second one-way gear is rotatable relative to the shaft in a first direction or a second direction, the first direction being opposite to the second direction. When the first locking gear meshes with the second one-way gear, the first locking gear restricts the second one-way gear from rotating relative to the shaft in the first direction. When the first locking gear disengages from the second one-way gear, the first locking gear releases the restriction on the second one-way gear, allowing the second one-way gear to rotate relative to the shaft in the first direction or the second direction. The locking assembly further includes a second pushing part, which is disposed at at least one end of the axial direction of the rotating shaft, and at least a portion of the second pushing part is exposed outside the first structural member.

10. The headrest according to claim 9, characterized in that, A rotating component is connected between the first structural component and the second structural component. The rotating component includes the rotating shaft and a connecting block. The rotating shaft passes through the connecting block, and the connecting block is fixed to the second structural component. The first locking gear is disposed on the second structural component through the connecting block. The connecting block is provided with a first receiving groove for accommodating the first locking gear. The opening of the first receiving groove faces the second one-way gear. A first guide structure is provided on the inner wall of the first receiving groove. A second guide structure is provided on the outer periphery of the first locking gear. One of the second guide structure and the first guide structure is a guide protrusion, and the other is a first guide groove. The length direction of the first guide groove is parallel to the axial direction of the rotating shaft. The guide protrusion can slide back and forth in the first guide groove along the length direction of the first guide groove.

11. The headrest according to claim 10, characterized in that, The second one-way gear includes a second gear body and a plurality of first one-way teeth. The second gear body is disposed on the outer periphery of the rotating shaft. The plurality of first one-way teeth are disposed at one end of the second gear body near the first locking gear, and the plurality of first one-way teeth are distributed sequentially around the axis of the second gear body. The first locking gear includes a third gear body and a plurality of second one-way teeth. At least a portion of the third gear body is disposed in the connecting block. The plurality of second one-way teeth are disposed at one end of the third gear body near the second one-way gear, and the plurality of second one-way teeth are distributed sequentially around the axis of the third gear body. The second one-way teeth can mesh with the first one-way teeth one-to-one. The outer periphery of the third gear body is provided with the second guide structure.

12. The headrest according to claim 10, characterized in that, The rotating shaft includes a first shaft and a second shaft that are spaced apart in sequence. The axes of the first shaft and the second shaft coincide. Two connecting parts are provided on the same end of the first structural member. There are two second one-way gears and two first locking gears. Each connecting part is provided with a second one-way gear. One of the first locking gears is provided on the first shaft, and the other first locking gear is provided on the second shaft. The first locking gears on the first shaft and the second shaft correspond one-to-one with the second one-way gears inside the two connecting parts, and the first locking gear can mesh with the corresponding second one-way gear. The locking assembly further includes a third elastic element, of which there are two. The two third elastic elements correspond one-to-one with the two first locking gears. The third elastic element is connected between the connecting block and the corresponding first locking gear. The third elastic element always has the tendency to drive the corresponding first locking gear to move closer to the second one-way gear. The locking assembly further includes a third pushing part, which has two parts. The two third pushing parts correspond one-to-one with the two connecting parts. The third pushing part is disposed in the corresponding connecting part and can move in the corresponding connecting part. The third pushing part is used to push the first locking gear in the corresponding connecting part to move so that the first locking gear is separated from the second one-way gear.

13. The headrest according to claim 1, characterized in that, The first structural component includes a first split body, a second split body, and a first locking component. The first split body and the second split body are slidably connected to each other so that the length of the first structural component is adjustable. The first locking component includes a first locking member and a fourth elastic member. The first locking member is connected to the second split body through the fourth elastic member. The first split body is provided with at least two locking holes, which are distributed at intervals along the relative sliding direction of the first split body and the second split body. The fourth elastic member has a tendency to drive the first locking member toward the locking hole so that the first locking member can be locked in either locking hole, thereby locking the relative position of the first split body and the second split body. When the first locking member is locked in the locking hole, a portion of the first locking member is exposed outside the first split body for operation.

14. The headrest according to claim 13, characterized in that, The first locking member includes a limiting part and an operating part connected to the limiting part. The limiting part is connected to the fourth elastic member. The size of the limiting part is larger than the size of the locking hole to prevent the limiting part from entering the locking hole. The size of the operating part is smaller than or equal to the size of the locking hole so that the operating part can enter and lock into the locking hole.

15. The headrest according to claim 13, characterized in that, The second split body has a first positioning groove on the side opposite to the first locking member. A portion of the first locking member is slidably disposed in the first positioning groove. The fourth elastic member is connected between the bottom of the first positioning groove and the first locking member.

16. The headrest according to claim 13, characterized in that, The first locking member is rotatably connected to the second split part. The first locking member can rotate about the axis of the connection part between the first locking member and the second split part in a direction closer to or away from the locking hole. The fourth elastic member is used to drive the first locking member to rotate in a direction closer to the locking hole.

17. The headrest according to claim 13, characterized in that, The first locking component further includes a first sliding member, which is slidably connected to the second split body. Along the relative sliding direction between the first split body and the second split body, the first sliding member can slide relative to the second split body. One end of the fourth elastic member is connected to the second split body, and the other end is connected to the first sliding member. The first locking member is disposed on one side of the first sliding member. At least a portion of the first sliding member abuts against the first locking member, and the abutting surface between the first sliding member and the first locking member is an inclined surface. In the relative sliding direction between the first split body and the second split body, the inclined surface gradually tilts away from the first locking member along the direction close to the locking hole, so that when the first sliding member moves towards the direction where the first locking member is located, it can push the first locking member into the locking hole. The fourth elastic member always has the tendency to drive the first sliding member towards the direction where the first locking member is located.

18. The headrest according to claim 1, characterized in that, The first structural component includes a first split, a second split, and a second locking component. The second split is slidably connected to the first split to make the length of the first structural component adjustable. The second locking component includes a second locking member, a locking block, and a fifth elastic member. The second locking member is disposed on the second split and has a plurality of first engaging portions. The plurality of first engaging portions are distributed sequentially at intervals along the relative sliding direction between the first split and the second split. The locking block is disposed on the first split. The fifth elastic member is used to apply a preload force to the locking block in a direction closer to the second locking member so that the locking block can engage with any of the first engaging portions to lock the first split and the second split. The locking block can move away from the second locking member until it disengages from the second locking member to release the locking of the first split and the second split. The second locking member is provided with a plurality of locking teeth, which are distributed sequentially at intervals along the relative sliding direction between the first part and the second part, and the locking teeth form the first engagement part.

19. The headrest according to claim 18, characterized in that, The second locking component further includes a limiting seat, which is disposed on the first split body. The limiting seat is provided with a limiting groove. The locking block is disposed in the limiting groove, and the locking block partially protrudes from the limiting seat to engage with the first engaging portion on the second locking component. The fifth elastic element is disposed between the bottom of the limiting groove and the locking block. The limiting seat includes a first main body and a third positioning post. The first main body is connected to the first split body. The limiting groove is provided on the first main body. One end of the third positioning post is connected to the bottom of the limiting groove, and the other end extends toward the opening of the limiting groove. The fifth elastic element is sleeved on the outer periphery of the third positioning post. The first split body is provided with a first groove, and one end of the second split body along its length is movably inserted into the first groove. At least a portion of the second locking member and the limiting seat are both provided in the first groove. The second locking member has a through hole, the length direction of which is parallel to the relative sliding direction of the first and second parts. The first engagement part is provided on at least one side of the second locking member in the width direction of the hole. The first groove is provided with a first clearance hole on one sidewall of the groove opposite to the first engagement part. The first clearance hole is opposite to the hole. One end of the locking block can pass through the hole and the first clearance hole in sequence and protrude out of the outside of the first part. The locking block includes a locking body and a pressing part connected to the locking body. The locking body is used to engage with the first engaging part. A portion of the locking body is slidably disposed in the limiting groove, and the size of the locking body is larger than the size of the first clearance hole to prevent the locking body from entering the first clearance hole. The fifth elastic element is connected to the locking body, and the size of the pressing part is smaller than or equal to the size of the first clearance hole so that the pressing part can enter the first clearance hole. The second locking member is provided with the first engaging portion on both sides of the opening width direction. The two ends of the locking body in the length direction protrude from both sides of the limiting seat and engage with the first engaging portion located on both sides of the opening width direction.

20. The headrest according to claim 1, characterized in that, The first structural component includes a first split body, a second split body, and a third locking component. The first split body and the second split body are slidably connected to each other, allowing the length of the first structural component to be adjustable. The third locking component includes a first locking member and a second locking member. The first locking member is disposed on the first split body, and the second locking member is disposed on the second split body. The first locking member has at least two engaging recesses, which are spaced apart sequentially along the relative sliding direction of the first split body and the second split body. The second locking member includes a fixed base, a second sliding member, and a positioning protrusion. The fixed base is connected to the second split body, and the second sliding member is slidably connected to the fixed base. The first locking member is disposed on one side of the fixed base, and the positioning protrusion is movably disposed on the second sliding member and can be inserted into any of the snap-fit ​​recesses. The positioning protrusion has a first state and a second state. In the first state, at least a portion of the positioning protrusion is exposed on the side of the fixed base facing the first locking member and inserted into the snap-fit ​​recess. In the second state, the positioning protrusion retracts into the fixed base and disengages from the snap-fit ​​recess. The positioning protrusion can move with the second sliding member, so that the positioning protrusion switches between the first state and the second state to be inserted into different snap-fit ​​recesses. The fixing seat has a positioning hole on the side opposite to the first locking member. When the positioning protrusion is in the first state, a portion of the positioning protrusion passes through the positioning hole and protrudes from the side of the fixing seat facing the first locking member. When the positioning protrusion is in the second state, the positioning protrusion disengages from the positioning hole and retracts into the fixing seat. The second sliding member includes a sliding body and a push-in part and a push-out part, both connected to the sliding body. The sliding body is slidably connected to the fixed base. The push-in part is used to push the positioning protrusion into the positioning hole, and the push-out part is used to push the positioning protrusion to keep the positioning protrusion in the first state. The first locking member is an elastic body, and the first locking member always has the tendency to drive the positioning protrusion toward the fixed seat so that the positioning protrusion disengages from the positioning hole. The sliding body is also provided with a clearance recess located at one end of the push-in portion away from the push-top. When the push-top disengages from the positioning protrusion, the positioning protrusion can move to the clearance recess.

21. The headrest according to claim 20, characterized in that, The second sliding member also includes a sixth elastic member, which always has the tendency to drive the positioning protrusion out of the positioning hole. When the pusher pushes the positioning protrusion, the positioning protrusion remains in the positioning hole. When the pusher disengages from the positioning protrusion, the positioning protrusion exits the positioning hole and retracts into the fixed seat.

22. The headrest according to claim 20 or 21, characterized in that, The second slider further includes a push protrusion that protrudes from the outside of the first or second part to drive the second slider to slide relative to the fixed base.

23. The headrest according to claim 20 or 21, characterized in that, The second locking member further includes a seventh elastic member, which is connected to the fixed base and the second sliding member respectively. The seventh elastic member always has the tendency to drive the second sliding member to insert the positioning protrusion into the snap-fit ​​recess, so that the positioning protrusion is in the first state.

24. The headrest according to claim 1, characterized in that, There are two of each of the second structural member and the rotating shaft. One of the second structural members is used to support the user's head, and the other is used to be placed on the placement piece. There are two sets of locking components. The two sets of locking components correspond one-to-one with the two rotating shafts. A part of the locking component is connected to the corresponding rotating shaft. The two ends of the first structural member in the length direction are rotatably connected to the two second structural members one-to-one through the two rotating shafts. The two sets of locking components are respectively set one-to-one at the two ends of the first structural member with the second structural member. The locking components can restrict the relative rotation between the first structural member and the corresponding second structural member. The pivots at both ends of the length of the first structural member are parallel to each other; A rotating component is connected to each of the first structural component and the two second structural components. Each of the two rotating components includes a connecting block and a rotating shaft passing through the connecting block. The connecting block of one of the rotating components is disposed on one of the second structural components, and the connecting block of the other rotating component is disposed on the second structural component. The second structural component for supporting the user's head is provided with a first front and a first back opposite to the first front. The first front is used to contact the user's head, and the first back is provided with a first connecting position. The first connecting position connects to the connecting block of one of the rotating components. The second structural component for placement on the placement component is provided with a second front and a second back at the part between the top and bottom. The second front faces the user, and the second back faces away from the user. The top of the second structural component for placement on the placement component is provided with a second connecting position. The second connecting position connects to the connecting block of the other rotating component. Along the direction from the second back to the second front, the first connecting position and the second connecting position are distributed at intervals, and the first connecting position is disposed closer to the second front relative to the second connecting position.

25. The headrest according to claim 24, characterized in that, When the second structural component is placed on the placement member, the second structural component includes a base and a second seat body. The base is placed on the placement member, and the second seat body is connected to the first structural component. The second seat body is disposed on the base and rotatably connected to the base, so that the second seat body can rotate relative to the base about its own axis. When the second seat body rotates relative to the base, it can drive the first structural component to rotate relative to the base. The second structural component also includes an adapter. The second main body has a hole structure adapted to the adapter at one end near the base. The center line of the hole structure and the axis of the adapter are both coincident with the axis of the second main body. One end of the adapter is connected to the base, and the other end is movably disposed in the hole structure. The second main body can rotate relative to the adapter around its own axis. The second main body includes a support frame and a chassis frame. The support frame and the base are respectively disposed on opposite sides of the chassis frame. The chassis frame is provided with the hole structure through it, and the chassis frame can rotate relative to the adapter. The adapter includes an adapter body and a protrusion on one end of the adapter body. The adapter body is movably passed through the hole structure, and the end of the adapter body away from the protrusion is connected to the base. The protrusion protrudes out of the outside of the adapter body and abuts against the side of the chassis frame facing away from the base, so as to prevent the adapter from separating from the chassis frame. The second structural component further includes a third limiting component, which is disposed on the base. The second main body has multiple locking positions, which are distributed sequentially at intervals around the axis of the second main body. The third limiting component can be locked into any of the locking positions.

26. The headrest according to claim 25, characterized in that, The first structural member is rotatably connected to the second main body on the second structural member via the pivot, so that the first structural member can rotate relative to the second main body and abut against the second main body. The second main body is provided with a second receiving groove adapted to the first structural member on the side facing away from the base. When the first structural member abuts against the second main body, at least a portion of the first structural member is received in the second receiving groove.

Images