Locking assembly and headrest

Abstract

The application relates to a locking assembly and a headrest. The locking assembly comprises a first limiting piece, a second limiting piece and a rotating gear. The first limiting piece is arranged on a first structural piece, the first structural piece is rotationally connected with a second structural piece through a rotating shaft, so that the first structural piece and the second structural piece can relatively rotate; the first limiting piece and the second limiting piece are sequentially and spacedly arranged along the axial direction of the rotating shaft; the rotating gear is arranged on the outer periphery of the rotating shaft, at least part of the rotating gear is engaged with the second limiting piece, the rotating gear can move along the axial direction of the rotating shaft to the direction close to the first limiting piece, until the rotating gear is engaged with the first limiting piece, so as to limit the relative rotation of the first structural piece and the second structural piece, or the rotating gear can move away from the first limiting piece relative to the rotating shaft until the rotating gear is separated from the first limiting piece, so as to release the limitation on the first structural piece and the second structural piece. The locking assembly is simple in structure and convenient to operate, and is beneficial to the use of the headrest.

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 headrest technology, and in particular to a locking component and 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] Some headrests for lunch breaks include a support component, a headrest, a base, and locking components. The two ends of the support component are rotatably connected to the base and headrest, respectively. Locking components are installed at opposite ends of the support component to restrict relative rotation between the support component and the base, and between the support component and the headrest. In use, the two ends of the support component can rotate relative to the base and headrest, allowing adjustment of the headrest's height and angle. Once adjusted, the locking components lock the relative positions of the support component and the base, as well as the relative positions of the support component and the headrest, for user convenience.

[0005] However, the locking components in the related headrests have complex structures and the locking operation is cumbersome and inconvenient to use. Utility Model Content

[0006] Therefore, it is necessary to provide a locking component and a headrest to address the above problems. The locking component has a simple structure, is easy to operate, and is beneficial to the use of the headrest.

[0007] On the one hand, a locking assembly is provided, including: a first limiting member, the first limiting member being disposed on a first structural member, the first structural member being rotatably connected to a second structural member via a rotating shaft, so that the first structural member and the second structural member can rotate relative to each other;

[0008] The second limiting member is used to be fixed relative to the second structural member, and the first limiting member and the second limiting member are distributed at intervals along the axial direction of the rotating shaft.

[0009] A rotating gear is disposed on the outer periphery of the rotating shaft. 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.

[0010] In one embodiment, the first limiting member is an internal spline, an internal gear, a worm gear, or a rack;

[0011] And / or, the second limiting member is an internal spline, internal gear, worm gear, or rack.

[0012] In one embodiment, a rotating component is connected between the first structural member and the second structural member. The rotating component includes a connecting block and the rotating shaft. The rotating shaft passes through the connecting block, the connecting block is fixed to the second structural member, and the second limiting member is disposed inside the connecting block.

[0013] In one embodiment, an elastic element is also included, which is disposed on the connecting block and connected to the rotating gear, and the elastic element always has a tendency to drive the rotating gear to move along the axial direction of the rotating shaft toward the first limiting element.

[0014] In one embodiment, a pusher is further included, which is disposed on the side of the first limiting member away from the rotating gear. The pusher is capable of driving the rotating gear to move along the axial direction of the shaft away from the first limiting member, so as to separate the rotating gear from the first limiting member.

[0015] In one embodiment, the pusher includes a push portion and a push rod connected to the push portion, the push rod being used to push the rotating gear to move relative to the first limiting member along the axial direction of the rotating shaft, and at least a portion of the push portion is exposed outside the first structural member.

[0016] In one embodiment, a connector is further included, which is disposed on the side of the first limiting member away from the rotating gear. The connector is provided with a connecting hole and a guide hole. The rotating shaft passes through the connecting hole and is rotatably connected to the connector. The end of the push rod away from the pushing part passes through the guide hole and protrudes from the side of the connector facing the first limiting member.

[0017] In one embodiment, there are multiple push rods, which are spaced apart around the center line of the pushing part. There are multiple guide holes, and each push rod corresponds to a guide hole. The push rod passes through the corresponding guide hole.

[0018] In one embodiment, the push rod includes a rod body and a second limiting block connected to the rod body. The second limiting block protrudes outward from the outside of the rod body and is capable of abutting against the side of the connector facing the first limiting member to prevent the push rod from disengaging from the connector.

[0019] On the other hand, a headrest is also provided, including a first structural member, a second structural member, a head support member, a rotating component, and the aforementioned locking assembly. The first structural member is a support member of the headrest, the second structural member is a head support member of the headrest, the rotating component includes a connecting block and a rotating shaft passing through the connecting block, the connecting block is fixed to the head support member, the support member is rotatably connected to the head support member through the rotating shaft, the first limiting member of the locking assembly is disposed on the support member, and the second limiting member of the locking assembly is disposed in the connecting block. When one end of the rotating gear meshes with the first limiting member, it restricts the relative rotation of the support member and the head support member. When the rotating gear separates from the first limiting member, it releases the restriction on the support member and the head support member.

[0020] In one embodiment, two second structural members are provided, one of which is the headrest of the headrest, and the other is the base of the headrest. Two rotating components are provided. One end of the support member along its length is rotatably connected to the headrest through the rotating shaft of one of the rotating components, and the other end of the support member along its length is rotatably connected to the base through the rotating shaft of the other rotating component. The two ends of the support member connected to the headrest and the base are provided with locking assemblies. The connecting block in the rotating component near the headrest is fixed to the headrest, and the connecting block in the rotating component near the base is fixed to the base. The locking assemblies and rotating components located on the same end of the support member correspond one-to-one. The rotating gear in the locking assembly is disposed on the outer periphery of the rotating shaft in the corresponding rotating component, and the first limiting member and the second limiting member in the locking assembly are sequentially spaced along the axial direction of the rotating shaft in the corresponding rotating component.

[0021] In one embodiment, two sets of locking components are provided at the same end of the support member. The two sets of locking components at the same end of the support member are distributed sequentially at intervals along the axial direction of the same rotating shaft. The rotating gears in the two sets of locking components at the same end of the support member are all disposed on the same rotating shaft, and the second limiting members in the locking components at the same end of the support member are all disposed in the same connecting block.

[0022] The aforementioned locking assembly has a simple structure, and by moving the rotating gear relative to the rotating shaft along the axial direction of the rotating shaft, one end of the rotating gear can mesh with the first limiting member, which facilitates the restriction of the rotation of the first structural member relative to the second structural member, thereby locking the relative position between the first structural member and the second structural member, and is easy to operate. Attached Figure Description

[0023] Figure 1 This is a perspective view of the headrest in some embodiments of this application (the headrest is in a folded state).

[0024] Figure 2 This is a perspective view of the headrest in some embodiments of this application (the headrest is in the open state).

[0025] Figure 3 This is a cross-sectional view of the headrest in some embodiments of this application.

[0026] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0027] Figure 5 This is a structural diagram of the support member, rotating component, and locking assembly in some embodiments of this application.

[0028] Figure 6 This is an exploded view of the support member, rotating component, and locking assembly in some embodiments of this application.

[0029] Figure 7 for Figure 6 A magnified view of a section at point B.

[0030] Figure 8 This is a perspective view of the pusher in some embodiments of this application.

[0031] In the picture:

[0032] 100. Support component; 101. Support body; 102. Connecting part; 1021. Mounting hole; 200. Head support; 300. Base; 400. Rotating component; 401. Rotating shaft; 4011. Shaft body; 4012. First limiting block; 402. Connecting block; 4021. Seat; 4022. Bushing; 500. Locking assembly;

[0033] 1. First limiting component; 2. Second limiting component; 3. Rotating gear; 4. Elastic component; 5. Pushing component; 51. Pushing part; 52. Push rod; 521. Rod body; 522. Second limiting block; 6. Connecting component; 61. Connecting hole; 62. Guide hole; 63. Recess. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] This application provides a locking assembly in some embodiments, including a first limiting member, a second limiting member, and a rotating gear. The locking assembly can be applied to a headrest. The following detailed description of the locking assembly's structure, using its application in a headrest as an example, illustrates this specific structure.

[0041] See Figure 1 , Figure 2 , Figure 5 and Figure 6 , Figure 1 A perspective view of a headrest (in a folded state) according to an embodiment of this application is shown. Figure 2 A perspective view of a headrest (in an open state) is shown in some embodiments of this application. Figure 5 This is a structural diagram of the support member 100, the rotating member 400, and the locking assembly 500 in some embodiments of this application. Figure 6This is an exploded view of the support member 100, rotating component 400, and locking assembly 500 in some embodiments of this application. The locking assembly 500 in some embodiments includes a first limiting member 1, a second limiting member 2, and a rotating gear 3. The first limiting member 1 is disposed on a first structural member, which is rotatably connected to a second structural member via a rotating shaft 401, allowing the first and second structural members to rotate relative to each other. In this embodiment, the first structural member is the support member 100 of the headrest, and the second structural member is the headrest 200 of the headrest, which supports the user's head. The second limiting member 2 is fixed relative to the headrest 200 (i.e., the second structural member), and the first limiting member 1 and the second limiting member 2 are sequentially spaced along the axial direction of the rotating shaft 401. At least a portion of the rotating gear 3 is disposed on the outer periphery of the rotating shaft 401; in this example, the rotating gear 3 is sleeved on the outer periphery of the rotating shaft 401. The rotating gear 3 can move relative to the rotating shaft 401 along the axial direction of the rotating shaft 401, so that the rotating gear 3 can move towards the first limiting member 1 until it engages with the first limiting member 1 to restrict the relative rotation of the support member 100 and the head support member 200, and can move away from the first limiting member 1 until it separates from the first limiting member 1 to release the restriction on the support member 100 and the head support member 200.

[0042] Since at least a portion of the rotating gear 3 engages with the second limiting member 2 in the connecting block 402, when the rotating gear 3 moves along the axial direction of the rotating shaft 401 towards the first limiting member 1, the rotating gear 3 can engage with the first limiting member 1, so that the rotating gear 3 simultaneously engages 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, so that the rotating gear 3 cannot rotate relative to the first limiting member 1 and the second limiting member 2, thereby preventing the support member 100 from rotating relative to the head support member 200. In this way, the purpose of restricting the relative rotation of the support member 100 (i.e., the first structural member) and the head support member 200 (i.e., the second structural member) is achieved. When the rotating gear 3 moves away from the first limiting member 1 along the axial direction of the rotating shaft 401 until the rotating gear 3 separates from the first limiting member 1, the rotating gear 3 only engages with the second limiting member 2. At this time, the support member 100 (i.e., the first structural member) can rotate relative to the head support member 200 (i.e., the second structural member), thereby adjusting the included angle between the support member 100 (i.e., the first structural member) and the head support member 200 (i.e., the second structural member). Thus, the operating angle of the head support member 200 (i.e., the second structural member) can be adjusted as needed. This locking assembly 500 has a simple structure, and by moving the rotating gear 3 along the axial direction of the rotating shaft 401 relative to the rotating shaft 401, one end of the rotating gear 3 can engage with the first limiting member 1, which facilitates restricting the rotation of the support member 100 (i.e., the first structural member) relative to the head support member 200 (i.e., the second structural member), thereby locking the relative position between the support member 100 (i.e., the first structural member) and the head support member 200 (i.e., the second structural member). The operation is simple.

[0043] In this type of headrest, when the rotating gear 3 of the locking assembly 500 is separated from the first limiting member 1, the support member 100 and the headrest member 200 can rotate relative to each other, allowing adjustment of the angle between the headrest member 200 and the support member 100. In actual use, by adjusting the angle between the headrest member 200 and the support member 100, the usage angle of the headrest member 200 can be adjusted to meet the user's needs. After adjusting the angle between the headrest member 200 and the support member 100, the rotating gear 3 of the locking assembly 500 is driven to move closer to 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 support member 100 and the headrest member 200. In this way, the relative position between the headrest 200 and the support 100 is fixed, preventing the included angle between the headrest 200 and the support 100 from decreasing due to accidents, thus ensuring the normal use of the headrest.

[0044] In some embodiments, a rotating component 400 connects the first structural member and the second structural member. When the first structural member is a headrest support 100 and the second structural member is a headrest support 200, the rotating component 400 connects the support 100 and the headrest support 200. The rotating component 400 includes a connecting block 402 and a rotating shaft 401. The rotating shaft 401 passes through the connecting block 402, and the connecting block 402 is fixed to the headrest support 200. A second limiting member 2 is disposed inside the connecting block 402. The placement of the connecting block 402 provides space for the arrangement of the second limiting member 2, facilitating its installation.

[0045] In some embodiments, the headrest includes two second structural members, one of which is a headrest 200 and the other is a base 300. Two rotating components 400 are provided; one end of the support member 100 along its length is rotatably connected to the headrest 200 via a pivot 401 of one of the rotating components 400, and the other end of the support member 100 along its length is rotatably connected to the base 300 via the other rotating component 400. Locking assemblies 500 are provided at both ends of the support member 100 that connect to the headrest 200 and the base 300. A connecting block 402 in the rotating component 400 near the headrest 200 is fixed to the headrest 200, and a connecting block 402 in the rotating component 400 near the base 300 is fixed to the base 300. The locking assembly 500 and the rotating component 400 located on the same end of the support 100 correspond one-to-one. The rotating gear 3 in the locking assembly 500 is arranged on the outer periphery of the rotating shaft 401 in the corresponding rotating component 400, and the first limiting member 1 and the second limiting member 2 in the locking assembly 500 are distributed sequentially and at intervals along the axial direction of the rotating shaft 401 in the corresponding rotating component 400.

[0046] The base 300 is used to place the headrest as a whole on a placement device, such as a table. In the headrest described above, the locking components 500 at both ends of the support member 100 are independent of each other. For the locking component 500 of the support member 100 near the headrest member 200, when the rotating gear 3 approaches the first limiting member 1 until it engages with the first limiting member 1, the rotating gear 3 engages with both the first limiting member 1 and the second limiting member 2 simultaneously, thus locking the relative position of the support member 100 and the headrest member 200. When the rotating gear 3 moves away from the first limiting member 1 until it separates from the first limiting member 1, the rotating gear 3 engages only with the second limiting member 2, releasing the restriction on the support member 100 and the headrest member 200. At this time, the support member 100 can rotate relative to the headrest member 200, that is, the user can adjust the usage angle of the headrest member 200. For the locking assembly 500 at the end of the support member 100 near the base 300, when the rotating gear 3 moves towards the first limiting member 1 until the first limiting member 1 engages, the rotating gear 3 engages with both the first limiting member 1 and the second limiting member 2 simultaneously, locking the relative position of the support member 100 and the base 300; when the rotating gear 3 moves away from the first limiting member 1 until the first limiting member 1 is separated, the rotating gear 3 engages only with the second limiting member 2, releasing the restriction on the support member 100 and the base 300. At this time, the support member 100 can rotate relative to the base 300, and the user can adjust the angle between the support member 100 and the base 300, adjust the vertical height of the support member 100 on the placement object (e.g., a desktop), thereby adjusting the height of the headrest 200.

[0047] In actual use, when the rotating gears 3 of the locking components 500 at both ends of the support member 100 along the length direction are respectively separated from the first limiting member 1 in the same group of locking components 500, the included angle between the headrest 200 and the support member 100 and the included angle between the base 300 and the support member 100 can be adjusted to reduce the angle. This allows the headrest 200 and the base 300 to be attached to the opposite sides of the support member 100, thereby achieving the folding of the headrest and facilitating its storage. When the headrest is needed, the angle between the headrest 200 and the support 100, as well as the angle between the base 300 and the support 100, are increased. After the headrest 200 is opened to a suitable position, the rotating gear 3 in the locking assembly 500 near the headrest 200 engages with the first limiting member 1. Similarly, after the base 300 is opened to a suitable position, the rotating gear 3 in the locking assembly 500 near the base 300 engages with the first limiting member 1. This locks the relative positions of the headrest 200 and the support 100, as well as the relative positions of the base 300 and the support 100, keeping the headrest in the open state and ensuring its normal use.

[0048] In one example, see Figure 5 and Figure 6Two sets of locking assemblies 500 are provided at the same end of the support member 100. The two sets of locking assemblies 500 on the same end of the support member 100 are distributed sequentially at intervals along the axial direction of the same rotating shaft 401. The rotating gears 3 in the two sets of locking assemblies 500 on the same end of the support member 100 are all mounted on the same rotating shaft 401, and the second limiting members 2 in the locking assemblies 500 on the same end of the support member 100 are all mounted in the same connecting block 402. The support member 100 includes a support body 101 and two connecting structures, which are respectively located at both ends of the support body 101 along its length. Each connecting structure includes two connecting parts 102, which are spaced apart along the width of the support body 101. Each connecting part 102 is provided with a mounting hole 1021. A first limiting member 1 is provided on the inner wall of the mounting hole 1021 facing the connecting block 402. The first limiting member 1 is located on the inner wall surrounding the mounting hole 1021. The two axial ends of the rotating shaft 401 are respectively located in the mounting holes 1021 of the two connecting parts 102. Two sets of locking components 500 are provided at the same end of the support member 100. The two sets of locking components 500 can lock the relative position of the support member 100 and the head support member 200 or the base 300, thereby increasing the locking force and improving the load-bearing capacity of the head support member 200.

[0049] 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.

[0050] 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.

[0051] 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 gear structures, or the first limiting member 1 and the second limiting member 2 can both be set to racks.

[0052] When both the first limiting member 1 and the second limiting member 2 are gear structures, the rotating gear 3 is an internal gear. Taking the headrest support 100 as the first structural member and the headrest 200 as the second structural member as an example, the implementation of the gear structure in the headrest is described in detail: 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 support member 100 and sleeved on the outer circumference of the rotating shaft 401. The gear sleeve of the first limiting member 1 can rotate relative to the rotating shaft 401. The gear sleeve of the second limiting member 2 is fixed to the head support member 200 and sleeved on the outer circumference of the rotating shaft 401. One axial end of the rotating gear 3 is sleeved on the outer circumference of the outer gear of the second limiting member 2 and meshes with the outer gear of the second limiting member 2. The other axial end of the shaft-driven gear 3 can be sleeved on the outer circumference of the outer gear of the second limiting member 2 and mesh with the outer gear of the second limiting member 2, or can be separated from the outer gear of the second limiting member 2. When the rotating gear 3 moves along the axial direction of the rotating shaft 401 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 support member 100 and the head support member 200. When the rotating gear 3 moves along the axial direction of the rotating shaft 401 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 support member 100 and the head support member 200.

[0053] When the first limiting member 1 is a rack and the second limiting member 2 is a rack, both the first limiting member 1 and the second limiting member 2 are arc-shaped racks, and the arc center of the first limiting member 1 and the arc center of the second limiting member 2 are both distributed on the axis of the rotating shaft 401. The rotating gear 3 is an internal gear, and one end of the rotating gear 3 meshes with the second limiting member 2. Taking the first structural component as the headrest support 100 and the second structural component as the headrest head support 200 as an example, the implementation of the rack in the headrest is described in detail: When the rotating gear 3 moves along the axial direction of the rotating shaft 401 toward the direction closer to 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 support 100 and the headrest head support 200; when the rotating gear 3 moves along the axial direction of the rotating shaft 401 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 support 100 and the headrest head support 200.

[0054] 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 and the second structural member or to release the restriction on the first structural member or the second structural member. Specific implementation methods for the specific structure of the first limiting member 1 and the second limiting member 2 will not be listed here.

[0055] After the headrest 200 is adjusted to its correct height or angle, to more conveniently limit the relative rotation of the support 100, base 300, or headrest 200, the locking assembly 500 also includes an elastic element 4. The elastic element 4 is mounted on the connecting block 402 and connected to the rotating gear 3. The elastic element 4 always tends to drive the rotating gear 3 along the axial direction of the rotating shaft 401 towards the first limiting member 1. When the headrest is in use, external force pushes the rotating gear 3 away from the first limiting member 1, causing the rotating gear 3 to separate from the first limiting member 1, allowing the support 100 to rotate relative to the headrest 200 or base 300. After adjusting the headrest 200 or support 100 to its correct position, the external force is removed. Under the elastic action of the elastic element 4, the elastic element 4 drives the rotating gear 3 towards the first limiting member 1 and engages with it, thereby automatically limiting the relative rotation of the support 100 with the headrest 200 or base 300.

[0056] In this example, the elastic element 4 is a compression spring, but it is not limited to this and can also be an elastic sheet or other structures.

[0057] In one example, see Figure 6 The connecting block 402 includes a seat 4021 and a bushing 4022 disposed on the seat 4021. The seat 4021 is fixed on the head support 200 or the base 300. The rotating shaft 401 passes through the bushing 4022. The seat 4021 is provided with a mounting groove surrounding the bushing 4022. 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 4022 and meshes with the second limiting member 2 in the mounting groove. The elastic member 4 is sleeved on the outer circumference of the bushing 4022 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.

[0058] See Figure 3 , Figure 4 , Figure 5 and Figure 6To facilitate the separation of the rotating gear 3 from the first limiting member 1, the locking assembly 500 in some embodiments further includes a pushing member 5. The pushing member 5 is disposed 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 401. 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.

[0059] When the support member 100 includes a support body 101 and a connecting part 102, the pusher 5 is movably disposed in the mounting hole 1021 of the connecting part 102. This design, on the one hand, allows the pusher 5 to be at least partially accommodated in the mounting hole 1021, 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 1021, improving the smoothness of the movement of the pusher 5.

[0060] Furthermore, the pushing member 5 includes a pushing part 51 and a push rod 52 connected to the pushing part 51. The push rod 52 is used to push the rotating gear 3. The push rod 52 is connected to the pushing part 51 so that the push rod 52 and the pushing part 51 move synchronously. Thus, when the user pushes the 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.

[0061] In other alternative embodiments, the pusher 5 may be movably mounted on the support 100, with a portion of the pusher 5 exposed outside the support 100. The pusher 5 is connected to the rotating gear 3, allowing the pusher 5 to be moved from outside the support 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 support 100 in the thickness direction, or at either end of the support 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; the specific location of the connection between the pusher 5 and the rotating gear 3 is not limited here.

[0062] 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.

[0063] In some embodiments, see Figure 6 and Figure 7The locking assembly 500 also includes a connector 6. The connector 6 is located on the side of the first limiting member 1 away from the rotating gear 3. The connector 6 has a connecting hole 61 and a guide hole 62. The rotating shaft 401 passes through the connecting hole 61 and is rotatably connected to the connector 6. The end of the push rod 52 away from the pushing part 51 passes through the guide hole 62 and protrudes from the side of the connector 6 facing the first limiting member 1. In actual implementation, the connector 6 is located in the mounting hole 1021 of the support member 100, and is positioned between the first limiting member 1 and the pushing part 51. When the angle between the support member 100 and the head support member 200 or the base 300 is adjusted, the connector 6 can rotate relative to the rotating shaft 401. When the end of the push rod 52 away from the pushing part 51 passes through the guide hole 62, the push rod 52 can be guided by the wall of the guide hole 62 when the external force drives the pushing member 5 to move, further improving the smoothness of the movement of the pushing member 5.

[0064] In one example, there are multiple push rods 52, which are spaced apart around the center line of the pushing part 51, and the center line of the pushing part 51 coincides with the axis of the rotating shaft 401. 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 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.

[0065] 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.

[0066] To prevent the connector 6 from detaching from the rotating shaft 401, the rotating shaft 401 includes a shaft body 4011 and a first limiting block 4012 connected to the shaft body 4011. The first limiting block 4012 is disposed at one axial end of the shaft body 4011. The rotating gear 3 and the connector 6 are sequentially passed through the shaft body 4011. The first limiting block 4012 is located on the side of the connector 6 facing away from the first limiting member 1. The first limiting block 4012 can prevent the connector 6 from falling off from the axial end of the rotating shaft 401.

[0067] 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 connector 6 facing the first limiting member 1 to prevent the push rod 52 from disengaging from the connector 6. The portion of the rod body 521 located between the 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 connector 6 facing the first limiting member 1 to prevent the push rod 52 from disengaging from the connector 6, thereby preventing the pushing member 5 from falling off the support member 100.

[0068] In order to improve the structural compactness of the locking assembly 500, the connector 6 is recessed on the side facing the first limiting member 1, and the recess 63 is located at the opening end of the guide hole 62. When the second limiting block 522 abuts against the connector 6, the second limiting block 522 can be accommodated through the recess 63.

[0069] 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.

[0070] In other embodiments, the headrest does not include a base 300. Instead, it is fixed to the placement member by providing suction cups or clamping heads on the support member 100, thereby reducing the planar requirements of the placement member and improving the applicability of the headrest.

[0071] It should be noted that the locking component 500 of this application is not limited to use in headrests, but can also be used in other rotatable mechanisms, such as reading stands, mobile phone stands, etc. There are no specific restrictions on the mechanisms in which the locking component 500 is applied.

[0072] 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.

[0073] 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 locking assembly, characterized in that, include: A first limiting member is provided on a first structural member. The first structural member is rotatably connected to a second structural member via a rotating shaft, so that the first structural member and the second structural member can rotate relative to each other. The second limiting member is used to be fixed relative to the second structural member, and the first limiting member and the second limiting member are distributed at intervals along the axial direction of the rotating shaft. A rotating gear is disposed on the outer periphery of the rotating shaft. 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.

2. The locking assembly according to claim 1, characterized in that, The first limiting component is an internal spline, gear, worm gear, or rack; And / or, the second limiting member is an internal spline, internal gear, worm gear, or rack.

3. The locking assembly according to claim 1, 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 the rotating shaft. The rotating shaft passes through the connecting block, and the connecting block is fixed to the second structural component. The second limiting component is disposed inside the connecting block.

4. The locking assembly according to claim 3, characterized in that, It also includes an elastic element, which is disposed on the connecting block and connected to the rotating gear. The 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.

5. The locking assembly according to any one of claims 1-4, characterized in that, It also 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.

6. The locking assembly according to claim 5, characterized in that, The pushing member includes a pushing part and a push rod connected to the pushing part. The push rod is used to push the rotating gear to move relative to the first limiting member along the axial direction of the rotating shaft. At least a portion of the pushing part is exposed outside the first structural member.

7. The locking assembly according to claim 6, characterized in that, It also includes a connector, which is disposed on the side of the first limiting member away from the rotating gear. The connector is provided with a connecting hole and a guide hole. The rotating shaft passes through the connecting hole and is rotatably connected to the connector. The end of the push rod away from the pushing part passes through the guide hole and protrudes from the side of the connector facing the first limiting member.

8. The locking assembly according to claim 7, characterized in that, The push rods are multiple and are spaced apart around the center line of the pushing part. The guide holes are multiple and correspond one-to-one with each push rod and the push rod passes through the corresponding guide hole.

9. The locking assembly according to claim 7, characterized in that, The push rod includes a rod body and a second limiting block connected to the rod body. The second limiting block protrudes outward from the outside of the rod body and can abut against the side of the connector facing the first limiting member to prevent the push rod from disengaging from the connector.

10. A headrest, characterized in that, The device includes a first structural component, a second structural component, a headrest, a rotating component, and a locking assembly as described in any one of claims 1 to 9. The first structural component is a support for the headrest, the second structural component is a headrest, the rotating component includes a connecting block and a rotating shaft passing through the connecting block, the connecting block is fixed to the headrest, the support is rotatably connected to the headrest via the rotating shaft, the first limiting member of the locking assembly is disposed on the support, and the second limiting member of the locking assembly is disposed in the connecting block. When one end of the rotating gear meshes with the first limiting member, it restricts the relative rotation of the support and the headrest; when the rotating gear separates from the first limiting member, it releases the restriction on the support and the headrest.

11. The headrest according to claim 10, characterized in that, The second structural component has two parts, one of which is the headrest of the headrest, and the other is the base of the headrest. There are two rotating components. One end of the support component along its length is rotatably connected to the headrest via the shaft of one of the rotating components, and the other end along its length is rotatably connected to the base via the shaft of the other rotating component. Both ends of the support component connecting the headrest and the base are provided with locking assemblies. The connecting block in the rotating component near the headrest is fixed to the headrest, and the connecting block in the rotating component near the base is fixed to the base. The locking assemblies and rotating components located on the same end of the support component correspond one-to-one. The rotating gear in the locking assembly is located on the outer periphery of the shaft in the corresponding rotating component, and the first limiting member and the second limiting member in the locking assembly are sequentially spaced along the axial direction of the shaft in the corresponding rotating component.

12. The headrest according to claim 10 or 11, characterized in that, Two sets of locking components are provided at the same end of the support member. The two sets of locking components at the same end of the support member are distributed sequentially at intervals along the axial direction of the same rotating shaft. The rotating gears in the two sets of locking components at the same end of the support member are all arranged on the same rotating shaft, and the second limiting members in the locking components at the same end of the support member are all arranged in the same connecting block.

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