Adjusting device and headrest

Abstract

The application provides a regulating device and a headrest. The regulating device comprises a base, a moving part, a moving mechanism and a locking mechanism. The moving mechanism is composed of a double four-bar linkage mechanism of a first linkage set, a second linkage set and a transmission part, so that the moving part moves relative to the base in at least two directions, and can flexibly switch positions in a plane, and has strong adjusting ability, good mobility and flexibility. The locking mechanism comprises a control assembly, a first locking part and a second locking part. The driving part of the control assembly is arranged on a locking linkage, the first locking part is matched with a first locking part of a passive linkage, and the first and second linkage mechanisms can be locked at the same time. After being locked, a third linkage mechanism similar to a four-bar linkage is formed, and the second locking part is matched with a second locking part, so that the third linkage mechanism can be locked, and the moving part is locked. The locking mechanism has simple structure, ingenious design, simple and fast operation, and good supporting effect after being locked. The headrest comprises the regulating device, so that the headrest has multi-dimensional movement and variable posture to adapt to different needs of different users.

Description

Technical Field

[0001] This invention relates to the field of seating, and particularly to an adjustment device and a headrest. Background Technology

[0002] In modern life, the comfort and functionality of seats are receiving increasing attention. As important components of seats, the performance of the adjustment mechanisms of headrests and lumbar supports directly affects the user experience.

[0003] Traditional headrest and lumbar support adjustment devices for chairs have many shortcomings. Some adjustment devices can only achieve adjustment in one direction, which cannot meet the diverse needs of the human body for headrest and lumbar support position in different postures, making it difficult to effectively relieve physical fatigue and not in line with ergonomic principles.

[0004] Some devices with multi-directional adjustment functions have complex structures and are inconvenient to operate. Users often need to spend a lot of time and effort adjusting them, and may still not achieve the desired support position, resulting in poor ease of use and applicability. In addition, existing adjustment devices also have problems with locking. Some locking structures are not stable enough and are prone to loosening, causing the headrest or lumbar support to shift during use and fail to provide reliable support; while some complex locking mechanisms, although ensuring stability, increase manufacturing costs and maintenance difficulty.

[0005] In the existing technology, there is a double rocker arm mechanism that can achieve multi-directional adjustment and can be used for headrests or lumbar supports of seats. However, the double rocker arm mechanism has a lot of problems, such as a single movement trajectory, a range of motion limited by the length of the arm, an inability to reach more positions, and poor flexibility. When developing a multi-directional adjustment device, we did not want to follow the old path of the double rocker arm mechanism. During the development process, we found that the four-bar linkage mechanism is more effective than the rocker arm mechanism.

[0006] Based on the above problems, the market urgently needs a device that integrates flexible movement and efficient locking. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides an adjustment device, comprising a base, a moving component, a motion mechanism, and a locking mechanism. The motion mechanism, consisting of a first and second linkage group and a transmission component, forms a double four-bar linkage, allowing the moving component to move relative to the base in at least two directions. It can flexibly switch positions within a plane, offering strong adjustment capability, excellent mobility and flexibility, and better ergonomics. The locking mechanism includes a control component and first and second locking components. The drive component of the control component is located on the locking linkage. The first locking component cooperates with the first locking part of the passive linkage to simultaneously lock the first and second linkage mechanisms. After locking, a third linkage mechanism, resembling a four-bar linkage, is formed. The second locking component cooperates with the second locking part to lock the third linkage mechanism, bringing the moving component and base to a standstill. This locking mechanism has a simple structure, ingenious design, and is easy and quick to operate. After locking, it provides good support and effectively meets the needs of seat adjustment and stable support.

[0008] A headrest is further provided, including a head support assembly and the aforementioned adjustment device. The head support assembly includes a backrest frame and a backrest holder, with the backrest frame rotatably mounted on the backrest holder about a left-right axis. The headrest is adjusted and supported by the aforementioned adjustment device, allowing it to have multi-dimensional movement and varied postures to adapt to the different needs of different users. Users can obtain more reasonable and comfortable head and neck support, which is ergonomic. The backrest frame can also rotate relative to the backrest holder to adapt to the curve and tilt angle of the human head and neck.

[0009] The technical solution of this invention is implemented as follows:

[0010] An adjustment device includes a base, a moving part, a motion mechanism, and a locking mechanism. The motion mechanism includes a first linkage group, a second linkage group, and a transmission member. The two ends of the first linkage group are rotatably connected to the base and the transmission member respectively to form a first linkage mechanism. The two ends of the second linkage group are rotatably connected to the moving part and the transmission member respectively to form a second linkage mechanism. The motion mechanism is configured to enable the moving part to move relative to the base in at least two directions.

[0011] The locking mechanism includes a control component, a first locking element, and a second locking element. The control component includes an operating element and a driving element. The operating element is movably mounted on a moving element or a base and is connected to the driving element. The first or second linkage group includes a locking link, and the other linkage group has a passive link. The driving element is movably mounted on the locking link. The locking link and the passive link are rotatably mounted on the transmission element via the same rotating shaft. Both the first and second locking elements are linked with the driving element. The passive link is provided with a first locking part. The first locking element is located beside the first locking part. The first locking element is configured to selectively engage with the first locking part to lock as the control component moves. When the first locking element engages with the second locking part to lock, the first linkage mechanism and the second linkage mechanism are locked.

[0012] When the first linkage mechanism is locked with the second linkage mechanism, the base, the first linkage assembly, the second linkage assembly, the transmission component, and the moving component form the third linkage mechanism. The moving component or the base is provided with a second locking part, and the second locking member is located next to the second locking part. The second locking member is configured to selectively cooperate with the second locking part to lock as the control component moves. When the second locking member cooperates with the second locking part to lock, the third linkage mechanism is locked, and the moving component and the base remain stationary.

[0013] The first and second linkages are both four-bar linkages, while the third linkage is a quasi-four-bar linkage. When the adjustment device is not locked, the first and second linkages enable the moving part to move in multiple directions relative to the base and can switch positions within at least one plane, thereby achieving the adjustment function. When the moving part is in motion, the first and second linkages together form a double four-bar linkage. Compared with existing technologies, this adjustment device has better adjustment capabilities, mainly reflected in the greater mobility and flexibility of the moving part, which better meets the user's multi-purpose needs and is more ergonomic.

[0014] In addition, the locking mechanism of this adjustment device has a simple structure and is ingeniously implemented:

[0015] The locking link and the passive link are rotatably mounted on the transmission component via the same rotating axis. That is to say, the first link group and the second link group have a common rotation point on the transmission component, which is the rotation point of the locking link and the passive link on the transmission component. The three are rotatably connected to each other at this point. At this common rotation point, the locking link, the passive link, and the transmission component all rotate around the same axis. The first locking part and the first locking element are set at this point, which can realize the simultaneous locking and unlocking of the first and second link mechanisms.

[0016] Specifically, the driving component is mounted on the locking link and is linked with the first locking component. When the first locking component locks with the first locking part on the passive link, the passive link and the driving component are also locked. Similarly, the passive link and the locking link are also locked. The passive link and the locking link cannot rotate relative to the transmission component. Since the first link mechanism and the second link mechanism are both four-bar linkages, both the first link mechanism and the second link mechanism are locked.

[0017] The third linkage is a four-bar linkage. After the first and second linkages are locked, the locking link and the passive link are equivalent to the same link. Although the mechanism formed by the first and second linkages cannot move independently, the third linkage can still move. Therefore, the second locking part needs to be locked to the base or the second locking part on the moving part in order to completely lock the entire adjustment device and keep the moving part and the base stationary.

[0018] In simple terms, the first locking member and the first locking part can simultaneously lock the first and second linkage mechanisms. At this time, the adjustment device can still move because there is a third linkage mechanism. Therefore, it is locked by the second locking member and the second locking part to finally lock the adjustment device. The first locking member and the second locking member are both controlled by the control component. Therefore, the structure of the locking mechanism is ingeniously designed, the locking and unlocking operation is simple and fast, and the support effect after locking is excellent.

[0019] Preferably, the first linkage group includes a first movable link and a second movable link; the second linkage group includes a third movable link and a third movable link. The first linkage mechanism, consisting of the base, the first movable link, the second movable link, and the transmission component, is a four-bar linkage mechanism. The second linkage mechanism, consisting of the transmission component, the third movable link, the fourth movable link, and the moving component, is also a four-bar linkage mechanism. The locking link is any one of the first, second, third, and fourth movable links, and the passive link and the locking link are in different linkage groups. Both the first and second linkage mechanisms are four-bar linkages, which offer more refined and fluid motion compared to existing technologies. Specifically, in one type of existing mechanism, two oscillating rods are sequentially connected to a base, enabling movement of the moving component relative to the base in two directions. However, this dual-oscillating-rod mechanism suffers from a single motion trajectory, concentrated load leading to wear, and a limited range of motion restricted by rod length, resulting in poor flexibility. In contrast, the proposed double four-bar linkage offers controllable motion trajectories, allowing for the design of complex trajectories such as straight lines, ellipses, and specific curves. Multiple rods distribute the load, reducing stress concentration and improving load-bearing capacity and service life. More importantly, it offers high customizability; by pre-setting the trajectory according to requirements, it achieves a wider range of motion coverage, resulting in more refined and flexible motion that generally meets user needs. The four-bar linkage demonstrates significant advantages in motion complexity, load capacity, and dynamic performance, making it a superior solution for applications requiring high control accuracy and reliability.

[0020] Preferably, the locking link is the fourth movable link, and the passive link is the second movable link. Therefore, in this design, the fourth movable link and the second movable link are rotatably connected to the transmission component at the same rotation point.

[0021] Preferably, the second movable link is closer to the moving part than the first movable link, and the fourth movable link is closer to the base than the third movable link. The positions of the second and fourth movable links are more suitable for locking.

[0022] Preferably, the transmission component includes a first rotation point, a second rotation point, and a third rotation point, which are arranged in a triangle. The fourth movable link and the second movable link are rotatably connected to the transmission component at the first rotation point, the first movable link is rotatably connected to the transmission component at the second rotation point, and the third movable link is rotatably connected to the transmission component at the third rotation point. This scheme specifically sets three triangularly distributed rotation points on the transmission component to realize the transmission between the first and second linkage mechanisms. When unlocked, the first and second linkage mechanisms can move together and jointly cause the moving component to perform multi-dimensional motion. The first rotation point is a common rotation point, and the rotation shaft is located at this point.

[0023] Preferably, when the first linkage mechanism is locked to the second linkage mechanism, the second movable link is locked to the fourth movable link. The base, the first movable link, the transmission component, the third movable link, the moving component, and the second and fourth movable links together form the third linkage mechanism. When only the second and fourth movable links are locked, the third linkage mechanism is still a movable four-bar linkage, and the moving component is not fully locked at this time. Therefore, in addition to locking the first and second linkage mechanisms, the second locking component and the second locking part are also required to lock the third linkage mechanism.

[0024] Preferably, the driving member is rotatably connected to the fourth movable link in the middle, and its two ends are respectively connected to the first locking member and the second locking member. The driving member is rotatably mounted on the fourth movable link. When the driving member rotates, its two ends rotate together. Since the first and second locking members are connected to the two ends of the driving member, the first and second locking members will move together to lock or unlock.

[0025] Preferably, the transmission component includes a first rotation point, a second rotation point, and a third rotation point, which are arranged in a triangular pattern. The locking link and the passive link are rotatably connected to the transmission component at the first rotation point, the other link of the first link group is rotatably connected to the transmission component at the second rotation point, and the other link of the second link group is rotatably connected to the transmission component at the third rotation point.

[0026] Preferably, the transmission component is roughly triangular in shape, and has clearance grooves on it to avoid the connecting rod. The shape of the transmission component also corresponds to the distribution of the rotation points, and the clearance grooves allow the connecting rod to move smoothly.

[0027] Preferably, the operating component is slidably mounted on the moving component. While controlling the movement of the moving component, the user can also control the operating component to switch between unlocked and locked states, which can be done with one hand, making operation more convenient.

[0028] Preferably, the middle part of the driving component is rotatably connected to the locking linkage, and both ends of the driving component are respectively connected to the first locking component and the second locking component. When the driving component rotates, it simultaneously controls the movement of the first locking component and the second locking component. The driving component can synchronously control the movement of the first and second locking components and can simultaneously control the state switching of the first, second and third linkage mechanisms, thereby realizing the unlocking and locking of the moving parts in one step.

[0029] Preferably, the driving component has a first waist-shaped groove and a second waist-shaped groove, the first locking component has a first transmission column, and the second locking component has a second transmission column. The first transmission column is inserted into the first waist-shaped groove, and the second transmission column is inserted into the second waist-shaped groove. The driving component and the locking component achieve transmission through the waist-shaped groove and the transmission column, which is simple in structure; moreover, even if the motion mechanism changes its own posture after movement, the transmission column can still remain in the waist-shaped groove.

[0030] Preferably, one end of the locking link is inserted with a rotating shaft, and the other end is inserted with a first rotating shaft. The locking link is rotatably connected to the base or moving part through the first rotating shaft. A first locking member is slidably disposed on the rotating shaft, and a second locking member is slidably disposed on the first rotating shaft. Under the action of the driving member, the first locking member and the second locking member slide on the rotating shaft to achieve locking and unlocking. In addition, a circumferential limiting structure needs to be provided between the first locking member, the second locking member, and the locking link to maintain the synchronous rotation of the first locking member, the second locking member, and the locking link. The circumferential limiting structure can be a convex-groove structure, etc.

[0031] Preferably, the first locking member, the second locking member, the first locking part, and the second locking part are all uniformly distributed with a plurality of meshing teeth in the circumferential direction. The first locking member selectively engages with the first locking part, and the second locking member selectively engages with the second locking part. The meshing and locking of the locking member and the locking part are achieved by the meshing teeth that are uniformly distributed in the circumferential direction on the same plane.

[0032] A headrest includes a head support assembly and the aforementioned adjustment device. The head support assembly includes a headrest frame and a headrest holder. The headrest frame is rotatably mounted on the headrest holder about a left-right axis. The headrest frame is configured to fit against and support the human head and neck. The headrest holder is the moving part. The base is configured to be connected to the back of a seat. When the headrest holder moves relative to the base, the headrest holder drives the headrest frame to move together.

[0033] The headrest is adjusted and supported via the aforementioned adjustment device. When the headrest frame is locked, the movement of the headrest itself is also locked. Furthermore, the headrest frame can adaptively rotate relative to the headrest frame to conform to the human head and neck. Even when the movement of the headrest frame is locked, it can still rotate. This adjustment device can also be applied to lumbar supports.

[0034] Preferably, the pillow frame has a receiving groove, and the operating component is slidably disposed in the receiving groove.

[0035] Preferably, the headrest frame is provided with a protrusion, and the operating part is provided with a sliding groove, with the protrusion inserted into the sliding groove.

[0036] Preferably, the operating component is also equipped with a lever, and the headrest frame includes two outwardly branching arms, one of which has a window through which the lever connects to the operating component. The lever makes operation more convenient.

[0037] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0038] The first and second linkages are both four-bar linkages, while the third linkage is a quasi-four-bar linkage. When the adjustment device is not locked, the first and second linkages enable the moving part to move in multiple directions relative to the base and can switch positions within at least one plane, thereby achieving the adjustment function. When the moving part is in motion, the first and second linkages together form a double four-bar linkage. Compared with existing technologies, this adjustment device has better adjustment capabilities, mainly reflected in the greater mobility and flexibility of the moving part, which better meets the user's multi-purpose needs and is more ergonomic.

[0039] In addition, the locking mechanism of this adjustment device has a simple structure and is ingeniously implemented:

[0040] The locking link and the passive link are rotatably mounted on the transmission component via the same rotating axis. That is to say, the first link group and the second link group have a common rotation point on the transmission component, which is the rotation point of the locking link and the passive link on the transmission component. The three are rotatably connected to each other at this point. At this common rotation point, the locking link, the passive link, and the transmission component all rotate around the same axis. The first locking part and the first locking element are set at this point, which can realize the simultaneous locking and unlocking of the first and second link mechanisms.

[0041] Specifically, the driving component is mounted on the locking link and is linked with the first locking component. When the first locking component locks with the first locking part on the passive link, the passive link and the driving component are also locked. Similarly, the passive link and the locking link are also locked. The passive link and the locking link cannot rotate relative to the transmission component. Since the first link mechanism and the second link mechanism are both four-bar linkages, both the first link mechanism and the second link mechanism are locked.

[0042] The third linkage is a four-bar linkage. After the first and second linkages are locked, the locking link and the passive link are equivalent to the same link. Although the mechanism formed by the first and second linkages cannot move independently, the third linkage can still move. Therefore, the second locking part needs to be locked to the base or the second locking part on the moving part in order to completely lock the entire adjustment device and keep the moving part and the base stationary.

[0043] In simple terms, the first locking member and the first locking part can simultaneously lock the first and second linkage mechanisms. At this time, the adjustment device can still move because there is a third linkage mechanism. Therefore, it is locked by the second locking member and the second locking part to finally lock the adjustment device. The first locking member and the second locking member are both controlled by the control component. Therefore, the structure of the locking mechanism is ingeniously designed, the locking and unlocking operation is simple and fast, and the support effect after locking is excellent. Attached Figure Description

[0044] Figure 1 This is a three-dimensional structural diagram of the headrest with the first and second linkage mechanisms shown in the embodiments of the present invention;

[0045] Figure 2 In this embodiment of the invention, the headrest is relative to Figure 1 Schematic diagram of the three-dimensional structure after movement Figure 1 ;

[0046] Figure 3 In this embodiment of the invention, the headrest is relative to Figure 1 Schematic diagram of the three-dimensional structure after movement Figure 2 ;

[0047] Figure 4 This is a three-dimensional structural diagram of the locking mechanism and adjustment device in an embodiment of the present invention;

[0048] Figure 5 The headrest of the third linkage mechanism is shown in the embodiment of the present invention as a side view;

[0049] Figure 6 In this embodiment of the invention, the headrest is relative to Figure 5 Side view after exercise Figure 1 ;

[0050] Figure 7 In this embodiment of the invention, the headrest is relative to Figure 5 Side view after exercise Figure 2 ;

[0051] Figure 8 This is a three-dimensional structural diagram of the transmission component in an embodiment of the present invention;

[0052] Figure 9 This is a three-dimensional structural diagram of the base in an embodiment of the present invention;

[0053] Figure 10 This is a three-dimensional structural diagram of the moving parts and the pillow frame in the embodiments of the present invention;

[0054] Figure 11 This is a bottom view of the transmission connection between the driving component and the operating component in an embodiment of the present invention;

[0055] Figure 12 This is a three-dimensional structural diagram of the transmission connection between the driving component and the operating component in an embodiment of the present invention;

[0056] Figure 13 This is a schematic diagram illustrating the application state of the headrest in an embodiment of the present invention. Figure 1 ;

[0057] Figure 14 This is a schematic diagram illustrating the application state of the headrest in an embodiment of the present invention. Figure 2 ;

[0058] Figure 15 This is a schematic diagram illustrating the application state of the headrest in an embodiment of the present invention. Figure 3 ;

[0059] Figure 16 This is a three-dimensional structural diagram of the locking member and locking part in the adjusting device of the present invention in an embodiment;

[0060] Figure 17 This is a three-dimensional structural diagram of the first locking member in an embodiment of the present invention.

[0061] The reference numerals in the attached drawings are as follows: base 1; mounting groove 101; arc surface 102; moving part, headrest frame 2; receiving groove 201; protrusion 202; support arm 21; window 22; first movable link 3; second movable link, passive link 4; third movable link 5; fourth movable link, locking link 6; transmission component 9; first rotation point 91; clearance groove 90; first locking part 10; second locking part 11; first locking element 12; first transmission column 121; second locking element 13; second transmission column 131; operating component 14; slide 141; first connecting part 142; first arc surface 143; side wall 144; driving component 15; first waist-shaped groove 151; second waist-shaped groove 152; second connecting part 153; second arc surface 154; transmission part 155; meshing tooth 16; headrest frame 17; lever 18. Detailed Implementation

[0062] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0063] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0064] In the description of this invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] The specific embodiments of the present invention are as follows:

[0066] like Figure 1-4 As shown, the present invention provides an adjustment device, including a base 1, a moving member 2, a motion mechanism, and a locking mechanism. The motion mechanism includes a first linkage group, a second linkage group, and a transmission member 9. The two ends of the first linkage group are rotatably connected to the base 1 and the transmission member 9 respectively to form a first linkage mechanism. The two ends of the second linkage group are rotatably connected to the moving member 2 and the transmission member 9 respectively to form a second linkage mechanism. The motion mechanism is configured to enable the moving member 2 to move relative to the base 1 in at least two directions.

[0067] The locking mechanism includes a control component, a first locking element 12, and a second locking element 13. The control component includes an operating element 14 and a driving element 15. The operating element 14 is movably mounted on the moving element 2 or the base 1, and the operating element 14 is connected to the driving element 15 in a transmission manner. The first linkage group or the second linkage group includes a locking linkage 6, and the other linkage group has a passive linkage 4. The driving element 15 is movably mounted on the locking linkage 6. The locking linkage 6 and the passive linkage 4 are rotatably mounted on the transmission element 9 via the same rotating shaft (not shown). The first locking element 12 and the second locking element 13 are both linked with the driving element 15. The passive linkage 4 is provided with a first locking part 10. The first locking element 12 is located beside the first locking part 10. The first locking element 12 is configured to selectively engage with the first locking part 10 to lock as the control component moves. When the first locking element 12 engages with the second locking part 11 to lock, the first linkage mechanism and the second linkage mechanism are locked.

[0068] When the first linkage mechanism is locked to the second linkage mechanism, the base 1, the first linkage assembly, the second linkage assembly, the transmission component 9, and the moving component 2 form the third linkage mechanism. The moving component 2 or the base 1 is provided with a second locking part 11, and a second locking member 13 is located beside the second locking part 11. The second locking member 13 is configured to selectively cooperate with the second locking part 11 to lock as the control component moves. When the second locking member 13 cooperates with the second locking part 11 to lock, the third linkage mechanism is locked, and the moving component 2 and the base 1 remain stationary.

[0069] The first and second linkage mechanisms are both four-bar linkages, while the third linkage mechanism is a quasi-four-bar linkage. When the adjustment device is not locked, the first and second linkage mechanisms enable the moving part 2 to move in multiple directions relative to the base 1, and it can switch positions within at least one plane, thereby achieving the adjustment function. When the moving part 2 is in motion, the first and second linkage mechanisms together form a double four-bar linkage. Compared with existing technologies, this adjustment device has better adjustment capabilities, mainly reflected in the greater mobility and flexibility of the moving part 2, which better meets the user's multi-purpose needs and is more ergonomic.

[0070] In addition, the locking mechanism of this adjustment device has a simple structure and is ingeniously implemented:

[0071] Locking link 6 and driven link 4 are rotatably mounted on transmission component 9 via the same rotation axis. This means the first and second link groups share a common rotation point on transmission component 9 (the first rotation point 91), which is also the rotation point of locking link 6 and driven link 4 on transmission component 9. All three are rotatably connected at this point. At this common rotation point, locking link 6, driven link 4, and transmission component 9 all rotate around the same axis. The first locking part 10 and the first locking element 12 are located at this point, enabling simultaneous locking and unlocking of both the first and second link mechanisms.

[0072] Specifically, the driving member 15 is mounted on the locking link 6, and the driving member 15 is linked with the first locking member 12. When the first locking member 12 locks with the first locking part 10 on the passive link 4, the passive link 4 and the driving member 15 are also locked. Similarly, the passive link 4 and the locking link 6 are also locked, and the passive link 4 and the locking link 6 cannot rotate relative to the transmission member 9. Since both the first link mechanism and the second link mechanism are four-bar linkages, both the first link mechanism and the second link mechanism are locked.

[0073] The third linkage mechanism is a four-bar linkage. After the first linkage mechanism and the second linkage mechanism are locked, the locking link 6 and the passive link 4 are equivalent to the same link. Although the mechanism formed by the first link group and the second link group cannot move independently, the third linkage mechanism can still move. Therefore, the second locking member 13 needs to be locked with the second locking part 11 on the base 1 or the moving part 2 in order to completely lock the entire adjustment device and keep the moving part 2 and the base 1 stationary.

[0074] In simple terms, the first locking member 12 and the first locking part 10 can simultaneously lock the first and second linkage mechanisms. At this time, the adjusting device can still move because there is a third linkage mechanism. Therefore, it is further locked by the second locking member 13 and the second locking part 11 to finally lock the adjusting device. Both the first locking member 12 and the second locking member 13 are controlled by the control component. Therefore, the structure of the locking mechanism is ingeniously designed, the locking and unlocking operation is simple and fast, and the support effect after locking is excellent.

[0075] The specific structure of the regulating device is described in further detail below:

[0076] Specifically, such as Figure 1-7As shown, the first linkage group includes a first movable link 3 and a second movable link 4; the second linkage group includes a third movable link 5 and a fourth movable link 6. The first linkage mechanism consisting of the base 1, the first movable link 3, the second movable link 4, and the transmission component 9 is a four-bar linkage mechanism, and the second linkage mechanism consisting of the transmission component 9, the third movable link 5, the fourth movable link 6, and the moving component 2 is a four-bar linkage mechanism. The locking link is any one of the first, second, third, and fourth movable links, and the passive link and the locking link are in different linkage groups. Further, the locking link is the fourth movable link 6, and the passive link is the second movable link 4. Therefore, in this scheme, the fourth movable link 6 and the second movable link 4 are rotatably connected to the transmission component 9 at the same rotation point. Positionally, the lower end of the first movable link 3 is rotatably connected to the rear of the base 1, and the upper end of the first movable link 3 is rotatably connected to the rear of the transmission component 9. The lower end of the second movable link 4 is rotatably connected to the front of the base 1, and the upper end of the second movable link 4 is rotatably connected to the rear ends of the transmission component 9 and the fourth movable link 6. The second movable link 4 is located in front of the first movable link 3 and is closer to the moving component 2 than the first movable link 3. The front end of the third movable link 5 is rotatably connected to the upper part of the moving component 2, and the rear end of the third movable link 5 is rotatably connected to the upper part of the transmission component 9. The front end of the fourth movable link 6 is rotatably connected to the lower part of the moving component 2. The fourth movable link 6 is located below the third movable link 5 and is closer to the base 1 than the third movable link 5. The positions of the second movable link 4 and the fourth movable link 6 are more suitable for locking. The rotational connection of the movable links is achieved through the rotating shafts of their respective rotation points.

[0077] To be more specific, such as Figure 8 As shown, the transmission component 9 includes a first rotation point 91, a second rotation point, and a third rotation point, which are arranged in a triangle. The fourth movable link 6 and the second movable link 4 are rotatably connected to the transmission component 9 at the first rotation point 91, the first movable link 3 is rotatably connected to the transmission component 9 at the second rotation point, and the third movable link 5 is rotatably connected to the transmission component 9 at the third rotation point. This scheme specifically sets three rotation points arranged in a triangle on the transmission component 9 to realize the transmission between the first and second linkage mechanisms. When unlocked, the first and second linkage mechanisms can move together and jointly cause the moving component 2 to perform multi-dimensional motion. The first rotation point 91 is the common rotation point, and the rotation shaft is located here. The transmission component 9 is roughly triangular in shape, and a clearance groove 90 is provided on the transmission component 9 to avoid the connecting rods. The shape of the transmission component 9 also corresponds to the distribution of the rotation points, and the clearance groove 90 allows the connecting rods to move smoothly.

[0078] Both the first and second linkage mechanisms are four-bar linkages, offering more refined and fluid motion compared to existing technologies. Specifically, in one type of existing mechanism, two oscillating rods are sequentially connected to a base, enabling movement of the moving component relative to the base in two directions. However, this dual-oscillating-rod type mechanism suffers from a limited motion trajectory, concentrated load leading to wear, and a limited range of motion restricted by rod length, resulting in poor flexibility. In contrast, the proposed double four-bar linkage offers controllable motion trajectories, allowing for the design of complex trajectories such as straight lines, ellipses, and specific curves. Multiple rods distribute the load, reducing stress concentration and improving load-bearing capacity and service life. More importantly, it offers high customizability; by pre-setting the trajectory according to requirements, it achieves a wider range of motion coverage, resulting in more refined and flexible motion that broadly meets user needs. The four-bar linkage demonstrates significant advantages in motion complexity, load capacity, and dynamic performance, making it a superior solution for applications requiring high control accuracy and reliability.

[0079] Regarding locking: such as Figure 1 , 4 As shown in Figures 5, 16, and 17, when the first linkage mechanism is locked to the second linkage mechanism, the second movable link 4 and the fourth movable link 6 are also locked. The base 1, the first movable link 3, the transmission component 9, the third movable link 5, the moving component 2, and the second movable link 4 and the fourth movable link 6 form the third linkage mechanism. Even when only the second movable link 4 and the fourth movable link 6 are locked, the third linkage mechanism remains a movable, four-bar linkage-like mechanism. The moving component 2 is not fully locked at this time. Therefore, in addition to locking the first and second linkage mechanisms, the second locking component 13 and the second locking part 11 are also required to lock the third linkage mechanism. Furthermore, when the first locking component 12 and the second locking component 13 simultaneously lock or unlock, the first, second, and third linkage mechanisms will be locked or unlocked synchronously.

[0080] Specifically, the operating component 14 is slidably mounted on the moving component 2. While controlling the movement of the moving component 2, the user can also control the operating component 14 to switch between unlocked and locked states, which can be completed with one hand, making operation more convenient. The driving component 15 is rotatably connected to the fourth movable link 6 in the middle. The two ends of the driving component 15 are respectively connected to the first locking component 12 and the second locking component 13. The driving component 15 is rotatably mounted on the fourth movable link 6. When the driving component 15 rotates, its two ends rotate together. Since the first and second locking components are connected to the two ends of the driving component 15, the first and second locking components 12 and 13 will move together to lock or unlock. That is, the state switching of the first, second and third linkage mechanisms can be controlled simultaneously, thereby realizing the unlocking and locking of the moving component 2 in one step. The driving component 15 has a first waist-shaped groove 151 and a second waist-shaped groove 152. The first locking component 12 has a first transmission column 121, and the second locking component 13 has a second transmission column 131. The first transmission column 121 is inserted into the first waist-shaped groove 151, and the second transmission column 131 is inserted into the second waist-shaped groove 152. The driving component 15 and the locking component are connected by the waist-shaped grooves and the transmission columns, resulting in a simple structure. Moreover, even if the motion mechanism changes its posture after movement, the transmission column can still remain in the waist-shaped groove.

[0081] One end of the locking link 6 is inserted with a rotating shaft, and the other end is inserted with a first rotating shaft (not shown). The locking link 6 is rotatably connected to the base 1 or the moving part 2 via the first rotating shaft. The first locking member 12 is slidably disposed on the rotating shaft, and the second locking member 13 is slidably disposed on the first rotating shaft. In this design, the locking link is a fourth movable link 6, which is rotatably connected to the moving part 2 via the first rotating shaft. The first locking part 10 is disposed on the second movable link 4, and the second locking part 11 is disposed on the moving part 2. Under the action of the driving member 15, the first locking member 12 and the second locking member 13 slide on the rotating shaft and the first rotating shaft to achieve locking and unlocking. In addition, a circumferential limiting structure needs to be provided between the first locking member 12, the second locking member 13, and the locking link 6 to maintain the synchronous rotation of the first locking member 12, the second locking member 13, and the locking link 6. The circumferential limiting structure can be a convex-groove structure, etc. Furthermore, since the middle part of the drive member 15 rotates and the two locking members are located on both sides of the drive member 15, the sliding directions of the two locking members are opposite when the drive member 15 rotates. Therefore, the orientation directions of the first locking member 12 and the second locking member 13 should also be opposite.

[0082] The locking elements and locking parts achieve selective locking through meshing teeth 16: The first locking element 12, the second locking element 13, the first locking part 10, and the second locking part 11 all have a plurality of meshing teeth 16 evenly distributed circumferentially. The meshing teeth 16 are all located on the end face of their respective components. The first locking element 12 selectively engages with the first locking part 10, and the second locking element 13 selectively engages with the second locking part 11. The meshing locking of the locking elements and locking parts is achieved through the meshing teeth 16 evenly distributed circumferentially on the same plane. A spring (not shown) is also fitted on the first rotating shaft on which the second locking element 13 is mounted. The spring always provides a spring force to the second locking element towards the second locking part 11. When the user does not control the movement of the operating element 14, the first and second locking elements are always locked with the first and second locking parts. When the user controls the movement of the operating element 14, the driving element 15 rotates and counteracts the spring force to make the lock engage, thus making operation easier and simpler.

[0083] In addition, such as Figure 9 As shown, the first movable link 3 has a backward-protruding curved arc, meaning the first movable link 3 bends from bottom to top and forward. A mounting groove 101 is provided on the base 1, and the lower end of the first movable link 3 is positioned in the mounting groove 101. The end face of the mounting groove 101 away from the first movable link 3 is an arc surface 102. The arc surface 102 adapts to the bending of the first movable link 3, and in conjunction with the bent first movable link 3, it can be used to increase the rotation angle, thereby solving the problem of the straight rod colliding with the base 1, causing motion interference, and the problem of the rotation angle being too small.

[0084] like Figure 1-3 As shown in Figures 13-15, this adjustment device is applied to a headrest, which includes a head support assembly and the aforementioned adjustment device. The head support assembly includes a headrest frame 17 and a headrest bracket 2. The headrest frame 17 is rotatably mounted on the headrest bracket 2 about a left-right axis. The headrest frame 17 is configured to fit against and support the human head and neck. The headrest bracket 2 is the moving part, and the base 1 is configured to be connected to the back of the seat. When the headrest bracket 2 moves relative to the base 1, the headrest bracket 2 drives the headrest frame 17 to move together.

[0085] This headrest features adjustable movement and support via the aforementioned adjustment mechanism, allowing for multi-dimensional movement and varied postures to adapt to the different needs of various users. Users can obtain more reasonable and comfortable head and neck support, conforming to ergonomic principles. The headrest frame 17 can also rotate relative to the headrest frame 2, adapting to the curve and tilt angle of the human head and neck. When the headrest frame 2 is locked, the movement of the headrest frame 17 is also locked. Furthermore, the headrest frame 17 can adaptively rotate relative to the headrest frame 2 to conform to the human head and neck; even when the movement of the headrest frame 17 is locked, it can still rotate. This adjustment mechanism can also be applied to lumbar supports.

[0086] In addition, such as Figure 10 As shown, the pillow frame 2 has a receiving groove 201, and the operating member 14 is slidably disposed in the receiving groove 201. The pillow frame 2 has a downwardly protruding protrusion 202, and the operating member 14 has a vertically penetrating sliding groove 141. The protrusion 202 is inserted into the sliding groove 141, making the operating member 14 slide more stably on the pillow frame 2. Furthermore, the operating member 14 is also provided with a lever 18. The pillow frame 2 includes two side-by-side support arms 21, one of which has a window 22. The lever 18 passes through the window 22 and connects to the operating member 14, making operation more convenient.

[0087] like Figure 11 , 12 As shown, the driving component 15 is rotatably mounted on the fourth movable link 6, and the operating component 14 is movably mounted on the headrest frame 2. The operating component 14 is connected to the driving component 15, but the headrest frame 2 and the fourth movable link 6 will also rotate relative to each other. At this time, the transmission between the driving component 15 and the operating component 14 must also adapt to the rotation of the fourth movable link 6 and the headrest frame 2. Specifically, the rear end of the operating component 14 is provided with a first connecting part 142, and the front end of the driving component 15 is provided with a second connecting part 153. The first connecting part 142 has a first arc-shaped surface 143 facing the second connecting part 153, and the second connecting part 153 has a corresponding second arc-shaped surface 154. The two cooperate with each other so that the driving component 15 and the operating component 14 can adapt to the relative rotation of the fourth movable link 6 and the headrest frame 2. A groove is made in the first arc-shaped surface 143 on the first connecting part 142, forming two sidewalls 144 in the groove. The sidewalls 144 are naturally located beside the first arc-shaped surface 143 and are further forward relative to the first arc-shaped surface 143. A spherical transmission part 155 protrudes from the second arc-shaped surface 154 of the second connecting part 153. The spherical transmission part 155 protrudes forward from the second arc-shaped surface 154 and is located between the two side walls 144. When the headrest frame 2 and the fourth movable connecting rod 6 rotate, the transmission part 155 rotates between the two side walls 144, and the two are configured to abut against each other for transmission. That is, when the operating member 14 slides, the transmission part 155 can be pushed to move by the side wall 144 at any position of the side wall 144, so that the sliding of the operating member 14 can always be transmitted to the driving member 15.

Claims

1. An adjustment device, characterized by: The device comprises a base, a moving part, a moving mechanism and a locking mechanism. The moving mechanism comprises a first connecting rod group, a second connecting rod group and a transmission part. The two ends of the first connecting rod group are rotatably connected with the base and the transmission part respectively and form a first connecting rod mechanism. The two ends of the second connecting rod group are rotatably connected with the moving part and the transmission part respectively and form a second connecting rod mechanism. The moving mechanism is configured to enable the moving part to move relative to the base in at least two directions. The first connecting rod group comprises a first movable connecting rod and a second movable connecting rod. The second connecting rod group comprises a third movable connecting rod and a fourth movable connecting rod. The first connecting rod mechanism formed by the base, the first movable connecting rod, the second movable connecting rod and the transmission part is a four-connecting rod mechanism. The second connecting rod mechanism formed by the transmission part, the third movable connecting rod, the fourth movable connecting rod and the moving part is a four-connecting rod mechanism. The locking mechanism comprises a control assembly, a first locking part and a second locking part. The control assembly comprises an operating part and a driving part. The operating part is movably arranged on the moving part or the base. The operating part is in transmission connection with the driving part. One of the first connecting rod group or the second connecting rod group comprises a locking connecting rod. The other connecting rod group has a passive connecting rod. The driving part is movably arranged on the locking connecting rod. The locking connecting rod and the passive connecting rod are rotatably arranged on the transmission part through the same rotation shaft. The first locking part and the second locking part are in linkage with the driving part. The passive connecting rod is provided with a first locking portion. The first locking part is located beside the first locking portion. The first locking part is configured to selectively cooperate with the first locking portion to be locked through the movement of the control assembly. When the first locking part cooperates with the first locking portion to be locked, the first connecting rod mechanism and the second connecting rod mechanism are locked. When the first connecting rod mechanism and the second connecting rod mechanism are locked, the base, the first connecting rod assembly, the second connecting rod assembly, the transmission part and the moving part form a third connecting rod mechanism. The moving part or the base is provided with a second locking portion. The second locking part is located beside the second locking portion. The second locking part is configured to selectively cooperate with the second locking portion to be locked through the movement of the control assembly. When the second locking part cooperates with the second locking portion to be locked, the third connecting rod mechanism is locked. The moving part and the base remain stationary. The locking connecting rod is any one of the first, second, third and fourth movable connecting rods. The passive connecting rod and the locking connecting rod are in different connecting rod groups.

2. The adjustment device of claim 1, wherein: The locking connecting rod is the fourth movable connecting rod. The passive connecting rod is the second movable connecting rod.

3. The adjustment device of claim 2, wherein: The second movable connecting rod is closer to the moving part than the first movable connecting rod. The fourth movable connecting rod is closer to the base than the third movable connecting rod.

4. The adjustment device of claim 2, wherein: The transmission part comprises a first rotation point, a second rotation point and a third rotation point. The first rotation point, the second rotation point and the third rotation point are in triangular distribution. The fourth movable connecting rod and the second movable connecting rod are rotatably connected with the transmission part at the first rotation point. The first movable connecting rod is rotatably connected with the transmission part at the second rotation point. The third movable connecting rod is rotatably connected with the transmission part at the third rotation point.

5. The adjustment device of claim 1, wherein: When the first connecting rod mechanism and the second connecting rod mechanism are locked, the second movable connecting rod and the fourth movable connecting rod are locked. The base, the first movable connecting rod, the transmission part, the third movable connecting rod, the moving part and the second movable connecting rod and the fourth movable connecting rod form the third connecting rod mechanism.

6. The adjustment device of claim 1, wherein: The middle part of the driving member is rotationally connected to the fourth movable connecting rod, and the two ends of the driving member are respectively in transmission connection with the first locking member and the second locking member.

7. The adjustment device of claim 1, wherein: The transmission member includes a first rotation point, a second rotation point and a third rotation point, which are distributed in a triangular shape; the locking connecting rod and the passive connecting rod are rotationally connected to the transmission member at the first rotation point; another connecting rod of the first connecting rod group is rotationally connected to the transmission member at the second rotation point; and another connecting rod of the second connecting rod group is rotationally connected to the transmission member at the third rotation point.

8. The adjustment device of claim 7, wherein: The transmission member is substantially in a triangular shape, and the transmission member is provided with a avoiding slot for avoiding the connecting rod.

9. The adjustment device of claim 1, wherein: The operation member is slidingly arranged on the moving member.

10. The adjustment device of claim 1, wherein: The middle part of the driving member is rotationally connected to the locking connecting rod, and the two ends of the driving member are respectively in transmission connection with the first locking member and the second locking member, and the driving member is rotationally controlled to simultaneously control the movement of the first locking member and the second locking member.

11. The adjustment device of claim 10, wherein: The driving member is provided with a first waist-shaped slot and a second waist-shaped slot, the first locking member is provided with a first transmission column, the second locking member is provided with a second transmission column, the first transmission column is inserted into the first waist-shaped slot, and the second transmission column is inserted into the second waist-shaped slot.

12. The adjustment device of claim 1, wherein: One end of the locking connecting rod is provided with a rotation shaft, the other end of the locking connecting rod is provided with a first rotation shaft, and the locking connecting rod is rotationally connected to the base or the moving member through the first rotation shaft; the first locking member is slidingly arranged on the rotation shaft, and the second locking member is slidingly arranged on the first rotation shaft.

13. The adjustment device of claim 1, wherein: The first locking member, the second locking member, the first locking part and the second locking part are uniformly distributed with a plurality of meshing teeth in the circumferential direction, the first locking member and the first locking part are selectively meshed and locked, and the second locking member and the second locking part are selectively meshed and locked.

14. A headrest, characterized by: The head support assembly includes a headrest frame and a headrest support, the headrest frame is rotationally arranged on the headrest support about an axis in the left-right direction; the headrest frame is configured to fit and support the head and neck of a human body, the headrest support is the moving member, and the base is configured to be connected with the back of a seat; when the headrest support moves relative to the base, the headrest support drives the headrest frame to move together.

15. The headrest of claim 14, wherein: The headrest support is provided with a receiving slot, and the operation member is slidingly arranged in the receiving slot.

16. The headrest of claim 15, wherein: The headrest support is provided with a protrusion, and the operation member is provided with a sliding groove, the protrusion is inserted into the sliding groove.

17. The headrest of claim 14, wherein: The operation member is further provided with a knob, the headrest support includes two branch arms diverging leftward and rightward, a window is formed in one of the branch arms, and the knob is connected with the operation member through the window.

Images