Locking components and headrest

Abstract

This application relates to a locking assembly and a headrest. The locking assembly includes a one-way gear and a locking gear. The one-way gear is mounted on a first structural member; at least a portion of the locking gear is mounted on a second structural member. The first structural member is rotatably connected to the second structural member via a rotating shaft. The locking gear is located on the outer periphery of the rotating shaft. The locking gear and the one-way gear are sequentially distributed along the axial direction of the rotating shaft, and the one-way gear is rotatable relative to the rotating shaft. Movement of the rotating shaft along its axial direction causes the locking gear to move closer to the one-way gear until the locking gear engages with the one-way gear, thus restricting the rotation of the one-way gear relative to the rotating shaft. Movement of the rotating shaft along its axial direction causes the locking gear to move away from the one-way gear until the locking gear disengages from the one-way gear, thus releasing the restriction on the one-way gear. This locking assembly has a simple structure, is easy to operate, and facilitates 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 as part of the scope of this utility model. 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 lock the relative positions 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 headrests of related technologies 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 facilitates the use of the headrest.

[0007] On the one hand, a locking component is provided, comprising:

[0008] One-way gear, the one-way gear being mounted on the first structural member; and

[0009] A locking gear, at least a portion of which is disposed on a second structural member, the first structural member being rotatably connected to the second structural member via a rotating shaft, the locking gear being located on the outer periphery of the rotating shaft, the locking gear and the one-way gear being sequentially distributed along the axial direction of the rotating shaft, and the one-way gear being rotatable relative to the rotating shaft;

[0010] Wherein, the rotation shaft can move along its axial direction to drive the locking gear to move toward the one-way gear until the locking gear meshes with the one-way gear, thereby restricting the one-way gear from rotating relative to the rotation shaft in the first direction;

[0011] The axial movement of the rotating shaft can drive the locking gear to move away from the one-way gear until the locking gear separates from the one-way gear, thereby releasing the restriction on the one-way gear.

[0012] In one embodiment, the 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 locking gear engages with the one-way gear, the locking gear restricts the one-way gear from rotating relative to the shaft in the first direction. When the locking gear disengages from the one-way gear, the locking gear releases the restriction on the one-way gear, allowing the one-way gear to rotate relative to the shaft in the first direction or the second direction.

[0013] In one embodiment, the first structural member is a support member of the headrest, and the second structural member is a headrest member of the headrest.

[0014] In one embodiment, a first pushing part is further included, which is disposed at at least one end of the axial direction of the rotating shaft, and at least a portion of the first pushing part is exposed outside the first structural member.

[0015] In one embodiment, there are two first pushing parts, which are respectively disposed at both ends of the axial direction of the rotating shaft.

[0016] In one embodiment, a rotating component is connected between the first structural member and the second structural member. 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 member. The locking gear is disposed on the second structural member through the connecting block. The connecting block is provided with a receiving groove for accommodating the locking gear. The opening of the receiving groove faces the one-way gear. A first guide structure is provided on the inner wall of the receiving groove, and a second guide structure is provided on the outer periphery of the locking gear. One of the second guide structure and the first guide structure is a guide protrusion, and the other is a guide groove. The length direction of the guide groove is parallel to the axial direction of the rotating shaft, and the guide protrusion can slide back and forth in the guide groove along the length direction of the guide groove.

[0017] In one embodiment, the one-way gear includes a first gear body and a plurality of first one-way teeth. The first gear body is disposed on the outer periphery of the rotating shaft, and the plurality of first one-way teeth are disposed at one end of the first gear body near the locking gear. The plurality of first one-way teeth are distributed sequentially around the axis of the first gear body. The locking gear includes a second gear body and a plurality of second one-way teeth. At least a portion of the second gear body is disposed in the connecting block, and the plurality of second one-way teeth are disposed at one end of the second gear body near the one-way gear. The plurality of second one-way teeth are distributed sequentially around the axis of the second gear body. The second one-way teeth can mesh with the first one-way teeth one-to-one. The outer periphery of the second gear body is provided with a second guide structure.

[0018] In one embodiment, the rotating shaft includes a first shaft and a second shaft that are spaced apart sequentially, with the axes of the first shaft and the second shaft coinciding. Two connecting portions are provided on the same end of the first structural member. There are two one-way gears and two locking gears. Each connecting portion is provided with a one-way gear. One locking gear is provided on the first shaft, and the other locking gear is provided on the second shaft. The locking gears on the first shaft and the second shaft correspond one-to-one with the one-way gears inside the two connecting portions, and the locking gears can mesh with the corresponding one-way gears.

[0019] In one embodiment, the system further includes two elastic elements, each corresponding to one of the two locking gears. The elastic elements are connected between the connecting block and the corresponding locking gear, and each elastic element always has a tendency to drive the corresponding locking gear toward the one-way gear.

[0020] In one embodiment, a second pushing part is further included. There are two second pushing parts, each corresponding to one of the two connecting parts. The second pushing part is disposed in the corresponding connecting part and can move in the corresponding connecting part. The second pushing part is used to push the locking gear in the corresponding connecting part to move so that the locking gear is separated from the one-way gear.

[0021] On the other hand, a headrest is also provided, including a first structural member, a second structural member, a pivot, and the aforementioned locking assembly. The first structural member is a support member of the headrest, the second structural member is a headrest member of the headrest, the headrest member is used to support the user's head, one end of the support member is rotatably connected to the headrest member through the pivot, and the locking assembly can restrict the rotation of the support member relative to the headrest member.

[0022] In one embodiment, there are two second structural members, one of which is the headrest and the other is the base of the headrest. There are also two pivots and two locking assemblies. One end of the support member along its length is rotatably connected to the headrest via one of the pivots, and the other end of the support member along its length is rotatably connected to the base via the other pivot. The two locking assemblies are respectively disposed at the two ends of the support member that are connected to the headrest and the base. The locking assembly closer to the headrest can restrict the rotation of the support member relative to the headrest, and the locking assembly closer to the base can restrict the rotation of the support member relative to the base.

[0023] The aforementioned locking assembly uses a rotating shaft to rotate axially, causing the locking gear to move closer to or away from the one-way gear, thus achieving engagement or disengagement between the locking gear and the one-way gear. When the locking gear and the one-way gear are engaged, the locking gear restricts the one-way gear from rotating relative to the rotating shaft in one direction; when the locking gear and the one-way gear are disengaged, the locking gear releases the restriction on the one-way gear. Compared with traditional locking assemblies, the locking assembly in this application is not only simple in structure but also facilitates adjustment of the included angle between the first and second structural components, making it convenient for users. Attached Figure Description

[0024] Figure 1 This is a perspective view of the headrest in some embodiments of this application (the headrest is in a folded state).

[0025] Figure 2 This is a perspective view of the headrest in some embodiments of this application (the headrest is in an open state).

[0026] Figure 3 This is a structural diagram of the support member, rotating component, and locking assembly in some embodiments of this application.

[0027] Figure 4 This is an exploded view of the support member, rotating component, and locking assembly in some embodiments of this application.

[0028] Figure 5 for Figure 4 A perspective view of the connecting block of the rotating component shown.

[0029] Figure 6 This is a structural diagram of the support member, rotating component, and locking assembly in other embodiments of this application.

[0030] Figure 7 This is an exploded view of the support member, rotating component, and locking assembly in other embodiments of this application.

[0031] Figure 8This is a cross-sectional view of the support member, rotating component, and locking assembly in some other embodiments of this application.

[0032] In the picture:

[0033] 100. Support component; 101. Connecting part; 1011. Mounting hole; 200. Head support component; 300. Base; 400. Rotating component; 401. Rotating shaft; 4011. First shaft; 4012. Second shaft; 402. Connecting block; 4021. Receiving groove; 4022. Guide groove; 1. One-way gear; 11. First gear body; 12. First one-way gear tooth; 2. Locking gear; 21. Second gear body; 211. Guide ridge; 22. Second one-way gear tooth; 3. Elastic component; 4. First pushing part; 5. Second pushing part; 51. Pushing body; 52. Buckle component. 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] See Figure 1 , Figure 2 and Figure 4 This application provides an embodiment of a locking assembly. The locking assembly includes a one-way gear 1 and a locking gear 2. The one-way gear 1 is mounted on a first structural member. At least a portion of the locking gear 2 is mounted on a second structural member, the first structural member being rotatably connected to the second structural member via a rotating shaft 401. The locking gear 2 is located on the outer periphery of the rotating shaft 401, and the locking gear 2 and the one-way gear 1 are sequentially distributed along the axial direction of the rotating shaft 401, with the one-way gear 1 capable of rotating relative to the rotating shaft 401. Movement of the rotating shaft 401 along its axial direction can cause the locking gear 2 to move closer to the one-way gear 1 until the locking gear 2 engages with the one-way gear 1, thereby restricting the rotation of the one-way gear 1 relative to the rotating shaft 401. Movement of the rotating shaft 401 along its axial direction can cause the locking gear 2 to move away from the one-way gear 1 until the locking gear 2 disengages from the one-way gear 1, thereby releasing the restriction on the one-way gear 1.

[0041] The locking gear 2 is positioned on the outer periphery of the rotating shaft 401. The axial movement of the rotating shaft 401 causes the locking gear 2 to approach and mesh with the one-way gear 1, thus restricting the one-way gear 1 from rotating relative to the rotating shaft 401 in one direction. At this time, the first structural component cannot rotate towards the second structural component but can only rotate away from it. Only the angle between the first and second structural components can be increased, not decreased. Therefore, when the locking gear 2 and the one-way gear 1 are engaged, the angle between the first and second structural components can be increased. After adjustment, the relative positions of the first and second structural components can be locked in one direction, preventing the angle between them from decreasing due to unforeseen circumstances. When it is necessary to reduce the angle between the first structural component and the second structural component, the rotating shaft 401 can be driven to move along its own axial direction, causing the locking gear 2 to move away from the one-way gear 1 until the locking gear 2 separates from the one-way gear 1, thereby releasing the restriction on the one-way gear 1 and allowing the one-way gear 1 to rotate in one of the directions. At this time, the angle between the first structural component and the second structural component can be reduced.

[0042] In the aforementioned locking assembly, the locking gear 2 moves closer to or further away from the one-way gear 1 via the axial movement of the rotating shaft 401, thereby achieving engagement or disengagement between the locking gear 2 and the one-way gear 1. When the locking gear 2 and the one-way gear 1 are engaged, the locking gear 2 restricts the one-way gear 1 from rotating relative to the rotating shaft 401 in one of the directions; when the locking gear 2 and the one-way gear 1 are disengaged, the locking gear 2 releases the restriction on the one-way gear 1. Compared with traditional locking assemblies, the locking assembly in this application is not only simple in structure but also easy to adjust the included angle between the first structural component and the second structural component, making it convenient for users.

[0043] The one-way gear 1 can rotate relative to the rotating shaft 401 in either a first direction or a second direction, where the first and second directions are opposite. When the locking gear 2 engages with the one-way gear 1, the locking gear 2 restricts the one-way gear 1 from rotating relative to the rotating shaft 401 in the first direction. When the locking gear 2 disengages from the one-way gear 1, the locking gear 2 releases the restriction on the one-way gear 1, allowing the one-way gear 1 to rotate relative to the rotating shaft 401 in either the first or second direction. The first direction refers to the direction of rotation of the one-way gear 1 relative to the rotating shaft 401 during the process of adjusting the included angle between the first and second structural components from large to small. The second direction refers to the direction of rotation of the one-way gear 1 relative to the rotating shaft 401 during the process of adjusting the included angle between the first and second structural components from small to large. When the locking gear 2 and the one-way gear 1 are engaged, the one-way gear 1 is restricted from rotating relative to the rotating shaft 401 in the first direction. At this time, the angle between the first structural component and the second structural component can only be increased and cannot be decreased, so as to prevent the angle between the first structural component and the second structural component from decreasing due to accident.

[0044] The locking assembly with the above structure can be applied to a headrest. When the locking assembly with the above structure is applied to a headrest, the first structural component is the headrest support 100, and the second structural component is the headrest 200.

[0045] It should be noted that the above-mentioned locking components are not limited to use in headrests, but can also be used in other devices. There are no specific restrictions on the devices or scenarios in which the locking components are applied. That is, the first structural component may not be the headrest 100 of the headrest, and the second structural component may not be the head support 200 of the headrest.

[0046] In some embodiments, a headrest is provided. See also Figure 1 and Figure 2 The headrest includes a first structural component, a second structural component, a pivot 401, and a locking assembly. The first structural component is a support member 100 of the headrest, and the second structural component is a headrest member 200 of the headrest. The headrest member 200 is used to support the user's head. One end of the support member 100 is rotatably connected to the headrest member 200 via the pivot 401. The locking assembly can restrict the rotation of the support member 100 relative to the headrest member 200.

[0047] In one example of a headrest, there are two second structural components: one is a headrest 200, and the other is a base 300. There are also two pivots 401 and two locking assemblies. One end of the support member 100 along its length is rotatably connected to the headrest 200 via one pivot 401, and the other end is rotatably connected to the base 300 via the other pivot 401. Two locking assemblies are respectively located at the two ends of the support member 100 where the headrest 200 and the base 300 are connected. The locking assembly closer to the headrest 200 restricts the rotation of the support member 100 relative to the headrest 200, and the locking assembly closer to the base 300 restricts the rotation of the support member 100 relative to the base 300. With this type of headrest, the user can adjust the angle between the headrest 200 and the support 100 according to their needs, thereby adjusting the usage angle of the headrest 200. The user can also adjust the angle between the support 100 and the base 300 according to their needs, thereby adjusting the tilt of the support 100 and thus adjusting the height position of the headrest 200 on the support 100.

[0048] 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, a rotating component 400 connects the support 100 and the headrest support 200. The rotating component 400 includes a rotating shaft 401 and a connecting block 402. The rotating shaft 401 passes through the connecting block 402, and the connecting block 402 is fixed to the headrest support 200 (i.e., the second structural member). A locking gear 2 is mounted on the headrest support 200 via the connecting block 402. The rotating shaft 401 passes through and is fixed to the connecting block 402, and one end of the support 100 is rotatably connected to the rotating shaft 401.

[0049] See Figure 3 and Figure 4 The locking assembly includes a one-way gear 1 and a locking gear 2. The one-way gear 1 is mounted on the support member 100 of the headrest. When the headrest includes a base 300 and a headrest 200, there are two rotating components 400 and two locking assemblies. One end of the support member 100 in the longitudinal direction is rotatably connected to the headrest 200 via a shaft 401 of one of the rotating components 400, and the other end of the support member 100 in the longitudinal direction is rotatably connected to the base 300 via a shaft 401 of the other rotating component 400. The two locking assemblies are respectively mounted on the two ends of the support member 100 where the headrest 200 and the base 300 are connected. At least a portion of the locking gear 2 of the locking assembly near the base 300 is mounted in a connecting block 402 on the base 300, and at least a portion of the locking gear 2 of the locking assembly near the headrest 200 is mounted in a connecting block 402 on the headrest 200.

[0050] Since the end of the support member 100 connected to the headrest 200 is rotatably connected to the shaft 401 of one of the rotating components 400 via a one-way gear 1, when the one-way gear 1 is separated from the locking gear 2, the one-way gear 1 can rotate relative to the shaft 401 in the first or second direction. At this time, the angle between the support member 100 and the headrest 200 can be increased or decreased, thereby adjusting the usage angle of the headrest 200, or the support member 100 and the headrest 200 can be folded. Since the end of the support member 100 with the base 300 is rotatably connected to the shaft 401 of another rotating component 400 via a one-way gear 1, when the one-way gear 1 is separated from the locking gear 2, the one-way gear 1 can rotate in the first or second direction. At this time, the angle between the support member 100 and the base 300 can be increased or decreased, thereby adjusting the height of the support member 100, or the support member 100 and the base 300 can be folded, so as to adjust the height of the headrest 200 and facilitate the storage of the headrest.

[0051] It should be noted that the first direction and the second direction are two opposite directions. The first direction is the direction of rotation of the one-way gear 1 relative to the rotating shaft 401 during the process of adjusting the angle between the support member 100 and the head support member 200 or the angle between the support member 100 and the base 300 from large to small; the second direction is the direction of rotation of the one-way gear 1 relative to the rotating shaft 401 during the process of adjusting the angle between the support member 100 and the head support member 200 or the angle between the support member 100 and the base 300 from small to large.

[0052] The locking gear 2 is set on the outer periphery of the rotating shaft 401. The rotating shaft 401 can move along its own axis to drive the locking gear 2 to approach and mesh with the one-way gear 1, thereby restricting the one-way gear 1 from rotating in the first direction. At this time, the support member 100 cannot rotate towards the head support member 200 or the base 300, but can only rotate away from the head support member 200 or the base 300. The angle between the support member 100 and the head support member 200 or the angle between the support member 100 and the base 300 can only be increased, but the angle between the support member 100 and the head support member 200 or the angle between the support member 100 and the base 300 cannot be decreased. Therefore, when the locking gear 2 and the one-way gear 1 are engaged, the angle between the support member 100 and the head support member 200 can be increased or the angle between the support member 100 and the base 300 can be decreased. After adjustment, the support member 100 or the head support member 200 can be locked in one direction, preventing the angle between the support member 100 and the head support member 200 or the angle between the support member 100 and the base 300 from becoming smaller due to accidents. When it is necessary to decrease the angle between the support member 100 and the head support member 200 or the angle between the support member 100 and the base 300, the drive shaft 401 moves along its own axial direction, causing the locking gear 2 to separate from the one-way gear 1, releasing the restriction on the one-way gear 1. When the locking gear 2 and the one-way gear 1 are separated, the locking gear 2 releases the restriction on the one-way gear 1, allowing the one-way gear 1 to rotate relative to the shaft 401 in the first direction. At this time, the support member 100 can rotate relative to the head support member 200 or the base 300. In actual implementation, when the headrest needs to be stored, the included angle between the support member 100 and the headrest member 200, as well as the included angle between the support member 100 and the base 300, can be adjusted to the minimum, so that the headrest member 200 fits against one side of the support member 100 and the support member 100 fits against one side of the base 300, thereby realizing the folding of the headrest, reducing the space occupied by the headrest, and making it easy to store and carry. When the headrest needs to be used, the headrest member 200, the support member 100 and the base 300 are opened, so that the headrest is in an open state.

[0053] In order to facilitate the movement of the rotating shaft 401 along its own axial direction, in some embodiments, the locking assembly further includes a first pushing part 4, which is disposed at at least one end of the axial direction of the rotating shaft 401. At least a portion of the first pushing part 4 is exposed outside the support member 100. In this way, the user can push the rotating shaft 401 to move through the first pushing part 4, thereby driving the locking gear 2 to move closer to or away from the one-way gear 1.

[0054] For example, there are two first pushing parts 4, which are respectively disposed at both ends of the axial direction of the rotating shaft 401, so that the rotating shaft 401 can be pushed by the first pushing parts 4 at both ends of the axial direction.

[0055] Of course, in other examples, the number of first push parts 4 can also be set to one, and the first push part 4 can be set at one end of the axial direction of the rotating shaft 401.

[0056] In some embodiments, see Figure 4 and Figure 5 A rotating component 400 connects the first structural component and the second structural component. When the first structural component is a headrest support 100 and the second structural component is a headrest support 200, the rotating component 400 includes a rotating shaft 401 and a connecting block 402. The rotating shaft 401 passes through the connecting block 402, and the connecting block 402 is fixed to the headrest support 200 (i.e., the second structural component). The locking gear 2 is mounted on the headrest support 200 via the connecting block 402. The rotating shaft 401 passes through and is fixed to the connecting block 402, and one end of the support 100 is rotatably connected to the rotating shaft 401. The connecting block 402 is provided with a receiving groove 4021 for accommodating the locking gear 2. The opening of the receiving groove 4021 faces the one-way gear 1. A first guide structure is provided on the inner wall of the receiving groove 4021, and a second guide structure is provided on the outer periphery of the locking gear 2. One of the second guide structure and the first guide structure is a guide protrusion 211, and the other is a guide groove 4022. The length direction of the guide groove 4022 is parallel to the axial direction of the rotating shaft 401. The guide protrusion 211 can slide back and forth in the guide groove 4022 and along the length direction of the guide groove 4022. In this example, the second guide structure is the guide protrusion 211, and the first guide structure is the guide groove 4022. By slidingly engaging the guide protrusion 211 and the guide groove 4022, the movement of the locking gear 2 can be guided, reducing the risk of the locking gear 2 deviating from its direction of movement. In addition, by engaging the guide protrusion 211 and the guide groove 4022, the relative rotation between the connecting block 402 and the locking gear 2 can also be restricted. In actual implementation, the toothed end of the one-way gear 1 faces the opening of the receiving groove 4021. In this way, the end of the locking gear 2 that is close to the one-way gear 1 can be moved out of the opening of the receiving groove 4021 and can mesh with the one-way gear 1. When the locking gear 2 moves towards the bottom of the receiving groove 4021, it can separate from the one-way gear 1.

[0057] In some embodiments, see Figure 4The one-way gear 1 includes a first gear body 11 and a plurality of first one-way teeth 12. The first gear body 11 is disposed on the outer periphery of the rotating shaft 401, and the plurality of first one-way teeth 12 are all disposed at one end of the first gear body 11 near the locking gear 2, and the first one-way teeth 12 are distributed sequentially around the axis of the first gear body 11. The locking gear 2 includes a second gear body 21 and a plurality of second one-way teeth 22. At least a portion of the second gear body 21 is disposed in the connecting block 402, and the plurality of second one-way teeth 22 are all disposed at the end of the second gear body 21 facing the one-way gear 1, and the plurality of second one-way teeth 22 are distributed sequentially around the axis of the second gear body 21. The second one-way teeth 22 mesh with the first one-way teeth 12 in a one-to-one correspondence. A second guide structure is provided on the outer periphery of the second gear body 21.

[0058] In this embodiment, a plurality of first one-way teeth 12 are provided at one end of the first gear body 11 and a plurality of second one-way teeth 22 are provided at one end of the second gear body 21. The second one-way teeth 22 mesh with the first one-way gear 1 in a one-to-one correspondence, so that the locking gear 2 can mesh with the second one-way teeth 22 distributed at multiple positions at the end of the first gear body 11, thereby limiting the multiple gear positions of the one-way gear 1 and improving the flexibility of use.

[0059] In some embodiments, see Figures 6 to 8The rotating shaft 401 includes a first shaft 4011 and a second shaft 4012 arranged sequentially at intervals. The axes of the first shaft 4011 and the second shaft 4012 coincide. Two connecting portions 101 are provided on the same end of the support member 100. There are two one-way gears 1 and two locking gears 2. Each connecting portion 101 contains a one-way gear 1, and one locking gear 2 is located on the first shaft 4011 and the other on the second shaft 4012. The locking gears 2 on the first shaft 4011 and the second shaft 4012 correspond one-to-one with the one-way gears 1 inside the two connecting portions 101, and the locking gear 2 can mesh with its corresponding one-way gear 1. In this example, the first shaft 4011 and the locking gear 2 located on the first shaft 4011 are integrally formed, making the first shaft 4011 and the locking gear 2 integrated into a single component. The second shaft 4012 and the locking gear 2 located on the second shaft 4012 are integrally formed, so that the first shaft 4011 and the locking gear 2 are integrated into a single component. In actual implementation, when the headrest has a connecting block 402, the connecting block 402 is located between the two connecting parts 101, and both connecting parts 101 are provided with mounting holes 1011. The end of the mounting hole 1011 near the locking gear 2 is the first end, and the end of the mounting hole 1011 away from the locking gear 2 is the second end. The one-way gear 1 is disposed in the mounting hole 1011, and the part of the inner wall of the mounting hole 1011 between the one-way gear 1 and the first end is the connecting section. One end of the locking gear 2 is disposed in the receiving groove 4021 of the connecting block 402, and the other end protrudes from the connecting block 402 and extends into the mounting hole 1011 from the first opening end of the mounting hole 1011, where it is rotatably connected to the connecting section. At this time, the locking gear 2 (i.e., the first shaft 4011 or the second shaft 4012) is rotatably connected to the inner wall of the mounting hole 1011. When the locking gear 2 is separated from the one-way gear 1, the toothless part of the locking gear 2 serves as the first shaft 4011 or the second shaft 4012 and is connected to the connecting section in the mounting hole 1011. When the locking gear 2 is moved closer to the corresponding one-way gear 1, the teeth on the end of the locking gear 2 near the one-way gear 1 mesh with the one-way gear 1, thereby restricting the rotation of the one-way gear 1 in the first direction. By having the two locking gears 2 mesh one-to-one with the two one-way gears 1 on the same end of the support member 100, the locking force on the support member 100 can be increased, thereby improving the load-bearing capacity of the headrest. In addition, since the first shaft 4011 and the second shaft 4012 are integrated with the locking gear 2, it is beneficial to simplify the structure of the headrest and save manufacturing materials.

[0060] In other examples, the first shaft 4011 and the locking gear 2 located on the first shaft 4011 can also be configured as a separate structure, and the second shaft 4012 and the locking gear 2 located on the second shaft 4012 can also be configured as a separate structure. Here, no specific restrictions are placed on the forming method of the first shaft 4011 and the locking gear 2 located on the first shaft 4011, nor on the forming method of the second shaft 4012 and the locking gear 2 located on the second shaft 4012.

[0061] In actual implementation, the connecting block 402 is provided with two receiving grooves 4021. The two receiving grooves 4021 are distributed along the axial direction of the first shaft 4011 or the second shaft 4012. The two receiving grooves 4021 correspond one-to-one with the two locking gears 2, and the receiving grooves 4021 are used to accommodate the corresponding locking gears 2.

[0062] Furthermore, the locking assembly also includes two elastic elements 3, each corresponding to one of the two locking gears 2. The elastic elements 3 are connected between the connecting block 402 and their corresponding locking gears 2. Each elastic element 3 always tends to drive its corresponding locking gear 2 towards the one-way gear 1. In actual implementation, external force pushes the first shaft 4011 and the second shaft 4012 to move axially along the first shaft 4011 (or the second shaft 4012), causing the locking gear 2 to separate from its corresponding one-way gear 1. After adjusting the angle between the support member 100 and the head support member 200, or the angle between the support member 100 and the base 300, the external force is removed. Under the elastic force of the elastic element 3, the elastic element 3 drives the first shaft 4011 and the second shaft 4012 towards the direction of the corresponding one-way gear 1, thus engaging the locking gear 2 with the corresponding one-way gear 1, thereby achieving automatic engagement between the locking gear 2 and the corresponding one-way gear 1, facilitating use.

[0063] For example, the connecting block 402 is located between the two connecting parts 101. When the connecting block 402 is provided with a receiving groove 4021, the two elastic members 3 are respectively provided in the two receiving grooves 4021. The two ends of the elastic members 3 are respectively connected to the bottom of the corresponding receiving groove 4021 and the corresponding locking gear 2.

[0064] It should be noted that the bottom of the receiving groove 4021 refers to the groove wall of the receiving groove 4021 facing the groove opening.

[0065] To facilitate the separation of the locking gear 2 from the one-way gear 1, in one example, the locking assembly further includes a second pushing part 5. There are two second pushing parts 5, each corresponding to one of the two connecting parts 101. The second pushing parts 5 are disposed in their respective connecting parts 101 and are movable within them. The second pushing parts 5 are used to push the locking gear 2 in the corresponding connecting part 101 to move, thereby separating the locking gear 2 from the one-way gear 1. In this embodiment, one end of the second pushing part 5 extends into the mounting hole 1011 of the corresponding connecting part 101 and connects to the locking gear 2, while the other end protrudes from the outside of the support member 100 to facilitate user pushing of the second pushing part 5.

[0066] In one example, the two second push parts 5 are respectively engaged with the two locking gears 2 in a one-to-one correspondence.

[0067] Furthermore, the second pushing part 5 includes a pushing body 51 and a fastening member 52 disposed on one end of the pushing body 51. The fastening member 52 is used to engage with the locking gear 2 to realize the connection between the second pushing part 5 and the locking gear 2.

[0068] Of course, in other examples, the second pushing part 5 can also be connected to the locking gear 2 through other structures, such as screws, threaded structures, etc., or the second pushing part 5 can be directly welded to the locking gear 2. There are no specific restrictions on the connection structure between the second pushing part 5 and the locking gear 2.

[0069] In one example, one-way gear 1 is an internal gear.

[0070] For example, the one-way gear 1 and the connecting part 101 are an integral structure. Of course, in other examples, they are combined... Figure 4 Alternatively, the one-way gear 1 and the connecting part 101 can be configured as separate structures, which is not specifically limited here.

[0071] For example, the locking gear 2 can also be moved toward or away from the one-way gear 1 by the following structure:

[0072] A linkage structure is movably installed outside the support member 100 (i.e., the first structural member). The linkage structure is connected to the rotating shaft 401 and is exposed outside the support member 100 (i.e., the first structural member). In this way, the user can turn or rotate the linkage structure outside the support member 100 (i.e., the first structural member) to drive the rotating shaft 401 to move along its own axis, so that the rotating shaft 401 can drive the locking gear 2 to move along the axis of the rotating shaft 401 in a direction closer to or away from the one-way gear 1.

[0073] 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 locking gear 2, and the linkage rack is connected to the locking gear 2. A knob is provided on the linkage gear, exposed outside the support member 100 (i.e., the first structural member), and the knob is coaxial with the linkage gear. When the user rotates the knob outside the support member 100, the linkage gear rotates, thereby causing the linkage rack meshing with the linkage gear to move along the axial direction of the locking gear 2, and further causing the locking gear 2 to slide, thus controlling the locking gear 2 to engage or disengage with the one-way gear 1. It is understood that in this type of linkage structure, there is no need to provide an elastic element 3 to provide elastic force for the locking gear 2 to move towards the one-way gear 1.

[0074] In another feasible embodiment, the locking gear 2 is fixed relative to the rotating shaft 401, an electromagnet is provided at the one-way gear 1, and a magnetic attraction element is provided on the locking gear 2. Alternatively, the locking gear 2 can be made of magnetic material to form a permanent magnet. When the electromagnet at the one-way gear 1 is energized, the electromagnet generates a magnetic attraction force on the locking gear 2. Under the action of the magnetic attraction force, both the locking gear 2 and the rotating shaft 401 move along the axial direction of the rotating shaft 401, thereby enabling the locking gear 2 to move along the axial direction of the rotating shaft 401 towards the one-way gear 1 until it engages with the one-way gear 1 to achieve locking. In a specific embodiment, when the locking gear 2 is a permanent magnet, the magnetic pole of the locking gear 2 near the electromagnet can be set as the N pole. When it is necessary to move the locking gear 2 towards the one-way gear 1, the direction of the current in the electromagnet at the one-way gear 1 is controlled so that the magnetic pole of the electromagnet near the locking gear 2 is the S pole. At this time, the electromagnet generates a magnetic attraction force on the locking gear 2. When it is necessary to move the locking gear 2 away from the one-way gear 1, the direction of the current in the electromagnet is reversed. At this time, the magnetic pole of the electromagnet near the locking gear 2 becomes the N pole, generating a repulsive force on the locking gear 2, so that the locking gear 2 can slide away from the one-way gear 1, thereby separating the locking gear 2 from the one-way gear 1.

[0075] It should be noted that there are many structures that can move the locking gear 2 toward or away from the one-way gear 1, which will not be listed here.

[0076] 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.

[0077] 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 one-way gear, the one-way gear being mounted on the first structural member; and A locking gear, at least a portion of which is disposed on a second structural member, the first structural member being rotatably connected to the second structural member via a rotating shaft, the locking gear being located on the outer periphery of the rotating shaft, the locking gear and the one-way gear being sequentially distributed along the axial direction of the rotating shaft, and the one-way gear being rotatable relative to the rotating shaft; The rotating shaft can move along its axial direction to drive the locking gear to move closer to the one-way gear until the locking gear meshes with the one-way gear, thereby restricting the rotation of the one-way gear relative to the rotating shaft; The axial movement of the rotating shaft can drive the locking gear to move away from the one-way gear until the locking gear separates from the one-way gear, thereby releasing the restriction on the one-way gear.

2. The locking assembly according to claim 1, characterized in that, The 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 locking gear meshes with the one-way gear, the locking gear restricts the one-way gear from rotating relative to the shaft in the first direction. When the locking gear disengages from the one-way gear, the locking gear releases the restriction on the one-way gear, allowing the one-way gear to rotate relative to the shaft in the first direction or the second direction.

3. The locking assembly according to claim 1, characterized in that, The first structural component is a support component for the headrest, and the second structural component is a headrest component for the headrest.

4. The locking assembly according to any one of claims 1 to 3, characterized in that, It also includes a first 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 first pushing part is exposed outside the first structural member.

5. The locking assembly according to claim 4, characterized in that, The first pushing part has two parts, and the two first pushing parts are respectively used to be disposed at both ends of the axial direction of the rotating shaft.

6. The locking assembly according to any one of claims 1 to 3, 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 locking gear is disposed on the second structural component through the connecting block. The connecting block is provided with a receiving groove for accommodating the locking gear. The opening of the receiving groove faces the one-way gear. A first guide structure is provided on the inner wall of the receiving groove, and a second guide structure is provided on the outer periphery of the locking gear. One of the second guide structure and the first guide structure is a guide protrusion, and the other is a guide groove. The length direction of the guide groove is parallel to the axial direction of the rotating shaft. The guide protrusion can slide back and forth in the guide groove along the length direction of the guide groove.

7. The locking assembly according to claim 6, characterized in that, The one-way gear includes a first gear body and a plurality of first one-way teeth. The first 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 first gear body near the locking gear, and the plurality of first one-way teeth are distributed sequentially around the axis of the first gear body. The locking gear includes a second gear body and a plurality of second one-way teeth. At least a portion of the second gear body is disposed in the connecting block. The plurality of second one-way teeth are disposed at one end of the second gear body near the one-way gear, and the plurality of second one-way teeth are distributed sequentially around the axis of the second gear body. The second one-way teeth can mesh with the first one-way teeth one-to-one. The outer periphery of the second gear body is provided with a second guide structure.

8. The locking assembly according to claim 6, 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 one-way gears and two locking gears. Each connecting part is provided with a one-way gear. One locking gear is provided on the first shaft and the other locking gear is provided on the second shaft. The locking gears on the first shaft and the second shaft correspond one-to-one with the one-way gears inside the two connecting parts, and the locking gears can mesh with the corresponding one-way gears.

9. The locking assembly according to claim 7, characterized in that, It also includes two elastic elements, each corresponding to one of the two locking gears. The elastic elements are connected between the connecting block and the corresponding locking gear, and each elastic element always has the tendency to drive the corresponding locking gear to move closer to the one-way gear.

10. The locking assembly according to claim 8, characterized in that, It also includes a second pushing part, which has two parts. The two second pushing parts correspond one-to-one with the two connecting parts. The second pushing part is disposed in the corresponding connecting part and can move in the corresponding connecting part. The second pushing part is used to push the locking gear in the corresponding connecting part to move so that the locking gear is separated from the one-way gear.

11. A headrest, characterized in that, The device includes a first structural member, a second structural member, a pivot, and a locking assembly as described in any one of claims 1 to 10. The first structural member is a support member of the headrest, the second structural member is a headrest member of the headrest, the headrest member is used to support the user's head, one end of the support member is rotatably connected to the headrest member through the pivot, and the locking assembly can restrict the rotation of the support member relative to the headrest member.

12. The headrest according to claim 11, characterized in that, The second structural component has two parts, one of which is the headrest and the other is the base of the headrest. There are two pivots and two locking assemblies. One end of the support member along its length is rotatably connected to the headrest via one of the pivots, and the other end along its length is rotatably connected to the base via the other pivot. The two locking assemblies are respectively located at the two ends of the support member where the headrest and the base are connected. The locking assembly closer to the headrest restricts the rotation of the support member relative to the headrest, and the locking assembly closer to the base restricts the rotation of the support member relative to the base.

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