Adjusting device and headrest

Abstract

The invention provides an adjusting device and a headrest. The adjusting device comprises a base, a moving part, a moving mechanism and a locking mechanism. The moving mechanism forms a double-four-bar mechanism by a first connecting rod group, a second connecting rod group and a transmission part, so that the moving part moves at least along two directions relative to the base, the position can be flexibly switched in a plane, the adjusting capability is strong, and the mobility and the flexibility are good; the locking mechanism comprises a control assembly, a first locking piece and a second locking piece. A driving piece of the control assembly is arranged on the locking connecting rod, a first locking piece is matched with a first locking part of the driven connecting rod, and the first connecting rod mechanism and the second connecting rod mechanism can be locked at the same time; the second locking part and the second locking part are locked to form a third connecting rod mechanism similar to a four-connecting-rod, the second locking part is matched with the second locking part, the third connecting rod mechanism can be locked, and the moving part is locked. The locking mechanism is simple in structure, ingenious in conception, easy and rapid to operate and good in supporting effect after locking; the headrest comprises the adjusting device, so that the headrest has multi-dimensional movement and variable postures to adapt to different requirements of different users.

Description

Technical Field

[0001] The present invention relates to the field of seats, and particularly to an adjusting device and a headrest. Background Art

[0002] In modern life, the comfort and functionality of seats have increasingly attracted people's attention. As important components of seats, the performance of the adjusting devices of headrests and lumbar supports directly affects the user experience.

[0003] Traditional adjusting devices for seat headrests and lumbar supports have many deficiencies. Some adjusting devices can only achieve single-direction adjustment, unable to meet the diverse needs of the human body for the positions of headrests and lumbar supports in different postures, difficult to effectively relieve physical fatigue, and not in line with the ergonomic principle.

[0004] Some devices with multi-directional adjustment functions have complex structures and inconvenient operations. Users often need to spend a lot of time and effort during adjustment, and still may not reach the desired support position, with poor convenience and applicability in use. In addition, there are also problems with the locking of existing adjusting devices. Some locking structures are not firm enough and are prone to loosening, resulting in the displacement of the headrest or lumbar support during use and unable to provide reliable support; while some complex locking mechanisms can ensure stability, but increase the manufacturing cost and maintenance difficulty.

[0005] In the prior art, there is a double swing rod mechanism that can achieve the function of multi-directional adjustment and can be used for the headrest or lumbar support of a seat. However, the double swing rod mechanism has a large number of problems, such as a single movement trajectory, the movement range being limited by the rod length and unable to reach more positions, with poor flexibility; when developing a multi-directional adjusting device, we do not want to follow the old path of the double swing rod mechanism. During the development process, we found that the four-link mechanism has better effects than the swing rod.

[0006] Based on the above problems, there is an urgent need in the market for a device integrating flexible movement and efficient locking. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides an adjusting device, which includes a base, a moving member, a motion mechanism and a locking mechanism. The motion mechanism consists of a first link group, a second link group and a transmission member to form a double four-bar linkage mechanism, enabling the moving member to move relative to the base along at least two directions, capable of flexibly switching positions within a plane, having strong adjustment ability, good mobility and flexibility, and being more ergonomic; the locking mechanism includes a control assembly, a first locking member and a second locking member. The driving member of the control assembly is arranged on the locking link, and the first locking member cooperates with the first locking portion of the passive link to simultaneously lock the first and second link mechanisms; after they are locked, a third link mechanism similar to a four-bar linkage is formed, and the second locking member cooperates with the second locking portion to lock the third link mechanism, making the moving member and the base stationary. This locking mechanism has a simple structure, ingenious concept, simple and fast operation, good support effect after locking, and can effectively meet the seat adjustment and stable support requirements.

[0008] Furthermore, a headrest is provided, which includes a head support assembly and the above adjusting device. The head support assembly includes a headrest frame and a headrest bracket, and the headrest frame is rotatably arranged on the headrest bracket around an axis in the left-right direction; this headrest is adjusted and supported by the above adjusting device, enabling the headrest to have multi-dimensional movement and variable postures to adapt to the different needs of different users, and users can obtain more reasonable and comfortable head and neck support, which is ergonomic; the headrest frame can also rotate relative to the headrest bracket to adapt to the curve and tilt angle of the human head and neck.

[0009] The technical solution of the present invention is realized as follows: An adjusting device includes a base, a moving member, a motion mechanism and a locking mechanism. The motion mechanism includes a first link group, a second link group and a transmission member. The two ends of the first link group are respectively rotatably connected to the base and the transmission member to form a first link mechanism, and the two ends of the second link group are respectively rotatably connected to the moving member and the transmission member to form a second link mechanism. The motion mechanism is configured to enable the moving member to move relative to the base along at least two directions; The locking mechanism includes a control assembly, a first locking member and a second locking member. The control assembly includes an operating member and a driving member. The operating member is movably arranged on the moving member or the base, and the operating member is in transmission connection with the driving member; one of the first link group or the second link group includes a locking link, and the other link group has a passive link. The driving member is movably arranged on the locking link, and the locking link and the passive link are rotatably arranged on the transmission member through the same rotating shaft; both the first locking member and the second locking member are linked with the driving member. The passive link is provided with a first locking portion, and the first locking member is located beside the first locking portion. The first locking member is configured to selectively cooperate with the first locking portion to lock along with the movement of the control assembly. When the first locking member cooperates with the second locking portion to lock, the first link mechanism and the second link mechanism are locked; When the first link mechanism and the second link mechanism are locked, the base, the first link assembly, the second link assembly, the transmission member, and the moving member form a third link mechanism. A second locking portion is provided on the moving member or the base, and the second locking member is located beside the second locking portion. The second locking member is configured to selectively cooperate with the second locking portion to lock with the movement of the control assembly. When the second locking member cooperates with the second locking portion to lock, the third link mechanism is locked, and the moving member and the base remain stationary.

[0010] Both the first link mechanism and the second link mechanism are four-bar linkages, and the third link mechanism is a quasi-four-bar linkage. When the adjusting device is unlocked, the first link mechanism and the second link mechanism can enable the moving member to perform multi-directional movement relative to the base and can at least perform position switching in one plane, thereby realizing the adjustment function. When the moving member is moving, the first link mechanism and the second link mechanism together form a double four-bar linkage. Compared with the prior art, the adjusting device has better adjustment ability, which is mainly reflected in the stronger mobility and flexibility of the moving member, better meeting the multi-purpose needs of users and being more ergonomic.

[0011] In addition, the locking mechanism of this adjusting device has a simple structure and is ingeniously realized: The locking link and the passive link are rotatably arranged on the transmission member through the same rotating shaft. That is to say, the first link group and the second link group have a common rotation point on the transmission member, that is, the rotation point of the locking link and the passive link on the transmission member. 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 member all rotate around the same axis. By setting the first locking portion and the first locking member here, it is possible to lock and unlock the first and second link mechanisms simultaneously. Specifically, the driving member is arranged on the locking link, and the driving member is linked with the first locking member. When the first locking member locks with the first locking portion on the passive link, the passive link and the driving member are also locked. Similarly, the passive link and the locking link are also locked, and the passive link and the locking link cannot rotate relative to the transmission member respectively. Since both the first link mechanism and the second link mechanism are four-bar linkages, the first link mechanism and the second link mechanism are both locked. The third link mechanism is a quasi-four-bar linkage. After the first link mechanism and the second link mechanism are locked, the locking link and the passive link 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 link mechanism can still move. Therefore, it is necessary to lock the second locking member with the second locking portion on the base or the moving member to completely lock the entire adjusting device and keep the moving member and the base stationary.

[0012] Briefly speaking, the first locking member and the first locking portion can lock the first and second link mechanisms simultaneously. At this time, the adjusting device can still move because there is still the third link mechanism. Therefore, the second locking member and the second locking portion are used for locking to finally achieve the locking of the adjusting device. Both the first locking member and the second locking member are controlled by the control component. Therefore, the structural design of the locking mechanism is ingenious, the operation of locking and unlocking is simple and fast, and the supporting effect after locking is excellent.

[0013] Preferably, the first link group includes a first movable link and a second movable link; the second link group includes a third movable link and a fourth movable link. The first link mechanism composed of the base, the first movable link, the second movable link and the transmission member is a four-bar link mechanism. The second link mechanism composed of the transmission member, the third movable link, the fourth movable link and the moving member is a four-bar link 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 link groups. Both the first link mechanism and the second link mechanism are four-bar link mechanisms. The movement of the four-bar link mechanism is more delicate and smooth than that of the prior art. Specifically, in a prior art mechanism, two swing rods are sequentially rotatably connected to the base, and the movement of the moving member relative to the base in two directions can also be achieved. However, the movement trajectory of this double-swing-rod form of mechanism is single, the load is concentrated and easy to wear, the movement range is limited by the rod length, and it cannot reach more positions, so the flexibility is poor. In contrast, the double four-bar link mechanism in this solution has a controllable movement trajectory, and complex trajectories such as straight lines, ellipses, and specific curves can be designed. Multiple rods share the load, reducing stress concentration, improving the bearing capacity and service life. More importantly, the degree of customization is high. After presetting the trajectory according to requirements, the movement range coverage is wider, the movement is delicate and more flexible, generally meeting the needs of users. The four-bar link mechanism has obvious advantages in terms of movement complexity, load capacity, dynamic performance, etc. In the case of high requirements for control accuracy and reliability, the four-bar link mechanism is a better solution.

[0014] Preferably, the locking link is the fourth movable link, and the passive link is the second movable link. Therefore, in this solution, the fourth movable link and the second movable link are rotatably connected to the transmission member at the same rotation point.

[0015] Preferably, the second movable link is closer to the moving member 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 movable link and the fourth movable link are more suitable for locking.

[0016] Preferably, the transmission member includes a first rotation point, a second rotation point and a third rotation point, and the first rotation point, the second rotation point and the third rotation point are distributed in a triangle; the fourth movable link and the second movable link are both rotatably connected to the transmission member at the first rotation point, the first movable link is rotatably connected to the transmission member at the second rotation point, and the third movable link is rotatably connected to the transmission member at the third rotation point. This solution is to specifically set three rotation points distributed in a triangle on the transmission member to realize the transmission of the first link mechanism and the second link mechanism. When the first and second link mechanisms are unlocked, they can move together and jointly make the moving member perform multi-dimensional movement; the first rotation point is a common rotation point, and the rotation axis is set here.

[0017] Preferably, when the first link mechanism and the second link mechanism are locked, the second movable link and the fourth movable link are locked, and the base, the first movable link, the transmission member, the third movable link, the moving member, and the second movable link and the fourth movable link form a third link mechanism. When only the second movable link and the fourth movable link are locked, the third link mechanism is still a movable quasi-four-bar link mechanism, and the moving member is not completely locked at this time. Therefore, in addition to locking the first link mechanism and the second link mechanism, the second locking member and the second locking portion are also required to lock the third link mechanism.

[0018] Preferably, the middle part of the driving member is rotatably connected to the fourth movable link, and the two ends of the driving member are respectively connected to the first locking member and the second locking member. The driving member is rotatably arranged on the fourth movable link, and when the driving member rotates, the two ends thereof 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 perform locking or unlocking movements together.

[0019] Preferably, the transmission member includes a first rotation point, a second rotation point and a third rotation point, and the first rotation point, the second rotation point and the third rotation point are distributed in a triangle; the locking link and the passive link are both rotationally connected to the transmission member at the first rotation point, the other link of the first link group is rotationally connected to the transmission member at the second rotation point, and the other link of the second link group is rotationally connected to the transmission member at the third rotation point.

[0020] Preferably, the transmission member is roughly triangular, and a clearance groove for avoiding the connecting rod is provided on the transmission member. The shape of the transmission member also corresponds to the distribution of the rotation points, and the clearance groove allows the connecting rod to move smoothly.

[0021] Preferably, the operating member is slidably arranged on the moving member. While controlling the movement of the moving member, the user can also control the operating member to switch between unlocking and locking states, which can be completed with one hand, making the operation more convenient.

[0022] Preferably, the middle part of the driving member is rotatably connected to the locking link, and the two ends of the driving member are respectively in transmission connection with the first locking member and the second locking member. When the driving member rotates, it simultaneously controls the movement of the first locking member and the second locking member. The driving member can synchronously control the movement of the first and second locking members, and can simultaneously control the state switching of the first, second, and third link mechanisms, so as to realize the unlocking and locking of the moving member in one step.

[0023] Preferably, a first waist-shaped groove and a second waist-shaped groove are formed on the driving member. A first transmission post is provided on the first locking member, and a second transmission post is provided on the second locking member. The first transmission post is inserted into the first waist-shaped groove, and the second transmission post is inserted into the second waist-shaped groove. The driving member and the locking member are transmitted through the waist-shaped groove and the transmission post, and the structure is simple; moreover, when the posture of the moving mechanism changes after movement, the transmission post can still remain in the waist-shaped groove.

[0024] Preferably, a rotating shaft is inserted at one end of the locking link, and a first rotating shaft is inserted at the other end of the locking link. The locking link is rotatably connected to the base or the moving member through the first rotating shaft; the first locking member is slidably arranged on the rotating shaft, and the second locking member is slidably arranged 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 and the rotating shaft to achieve locking and unlocking; in addition, a circumferential limiting structure needs to be provided between the first locking member and 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 rib-groove structure or the like.

[0025] Preferably, a plurality of meshing teeth are evenly distributed along the circumferential direction on the first locking member, the second locking member, the first locking portion and the second locking portion. The first locking member and the first locking portion are selectively meshed and locked, and the second locking member and the second locking portion are selectively meshed and locked. The meshing and locking of the locking member and the locking portion are realized through the meshing teeth evenly distributed along the circumferential direction on the same plane.

[0026] A headrest includes a head support assembly and the above-mentioned adjusting device. The head support assembly includes a headrest frame and a headrest bracket. The headrest frame is rotatably arranged on the headrest bracket around an axis in the left-right direction; the headrest frame is configured to fit and support the human head and neck, the headrest bracket is the moving member as described above, and the base is configured to be connected to the backrest of the seat; when the headrest bracket moves relative to the base, the headrest bracket drives the headrest frame to move together.

[0027] The headrest is adjusted and supported by the above-mentioned adjusting device. When the headrest bracket is locked, the movement of the headrest frame is also locked. In addition, the headrest frame can also rotate adaptively relative to the headrest bracket to fit the human head and neck. Even if the movement of the headrest frame is locked, the headrest frame can still rotate. This adjusting device can also be applied to a lumbar support.

[0028] Preferably, a receiving groove is formed in the headrest frame, and the operating member is slidably disposed in the receiving groove.

[0029] Preferably, a convex block is provided on the headrest frame, and a sliding groove is provided on the operating member, and the convex block is inserted into the sliding groove.

[0030] Preferably, a dial is further provided on the operating member. The headrest frame includes two arms that diverge left and right. A window is formed in one of the arms, and the dial passes through the window and is connected to the operating member. The dial makes the operation more convenient.

[0031] The design starting point, concept and beneficial effects of the present invention adopting the above technical solutions are as follows: The first link mechanism and the second link mechanism are both four-bar link mechanisms, and the third link mechanism is a quasi-four-bar link mechanism. When the adjusting device is unlocked, the first link mechanism and the second link mechanism can make the moving member move in multiple directions relative to the base, and at least can perform position switching in one plane, so as to achieve the adjustment function; when the moving member is moving, the first link mechanism and the second link mechanism together form a double four-bar link mechanism. Compared with the prior art, the adjusting ability of this adjusting device is better, which is mainly reflected in that the movability and flexibility of the moving member are stronger, it can better meet the multi-purpose needs of users, and it is more in line with ergonomics.

[0032] In addition, the locking mechanism of this adjusting device has a simple structure and is ingeniously realized: The locking link and the passive link are rotatably arranged on the transmission member through the same rotating shaft. That is to say, the first link group and the second link group have a common rotation point on the transmission member, that is, the rotation point of the locking link and the passive link on the transmission member. 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 member all rotate around the same axis. By setting the first locking portion and the first locking member here, the first and second link mechanisms can be locked and unlocked simultaneously; Specifically, the driving member is arranged on the locking link, and the driving member is linked with the first locking member. When the first locking member is locked with the first locking portion on the passive link, the passive link and the driving member are also locked. Similarly, the passive link and the locking link are also locked, and the passive link and the locking link cannot rotate relative to the transmission member respectively. Since the first link mechanism and the second link mechanism are both four-bar link mechanisms, the first link mechanism and the second link mechanism are both locked; The third link mechanism is a quasi-four-bar link mechanism. After the first link mechanism and the second link mechanism are locked, the locking link and the passive link are equivalent to the same link. Although the mechanism composed of the first link group and the second link group cannot move independently, the third link mechanism can still move. Therefore, the second locking member needs to be locked with the second locking portion on the base or the moving member to completely lock the entire adjusting device and keep the moving member and the base stationary.

[0033] Simply put, the first locking member and the first locking portion can lock the first and second connecting rod mechanisms at the same time. At this time, the adjusting device can still move because there is a third connecting rod mechanism. Therefore, it is locked through the second locking member and the second locking portion to finally achieve the locking of the adjusting device, and the first locking member and the second locking member are both controlled by the control component; therefore, the structural setting of the locking mechanism is ingeniously conceived, the locking and unlocking operations are simple and fast, and the supporting effect after locking is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a three-dimensional structural schematic diagram of the headrest showing the first and second connecting rod mechanisms in the embodiment; Figure 2 In the embodiment of the present invention, the headrest is relative to Figure 1 Schematic diagram of the three-dimensional structure after exercise Figure 1 ; Figure 3 In the embodiment of the present invention, the headrest is relative to Figure 1 Schematic diagram of the three-dimensional structure after exercise Figure 2 ; Figure 4 It is a schematic diagram of the three-dimensional structure of the locking mechanism and the adjusting device in the embodiment of the present invention; Figure 5 A side view of the headrest showing the third linkage mechanism in the embodiment of the present invention; Figure 6 In the embodiment of the present invention, the headrest is relative to Figure 5 Side view after exercise Figure 1 ; Figure 7 In the embodiment of the present invention, the headrest is relative to Figure 5 Side view after exercise Figure 2 ; Figure 8 It is a three-dimensional structural schematic diagram of a transmission member in an embodiment of the present invention; Figure 9 It is a schematic diagram of the three-dimensional structure of the base in the embodiment of the present invention; Figure 10 It is a three-dimensional structural schematic diagram of the moving part and the pillow frame in the embodiment of the present invention; Figure 11 A bottom view of the driving member and the operating member in the embodiment of the present invention in transmission connection; Figure 12 It is a schematic diagram of a three-dimensional structure in which a driving member and an operating member are connected in transmission in an embodiment of the present invention; Figure 13 Schematic diagram of the application state of the headrest in the embodiment of the present invention Figure 1 ; Figure 14 Schematic diagram of the application state of the headrest in the embodiment of the present invention Figure 2 ; Figure 15 Schematic diagram of the application state of the headrest in the embodiment of the present invention Figure 3 ; Figure 16 Schematic three - dimensional structure diagram of the locking member and the locking portion in the adjusting device in the embodiment of the present invention; Figure 17 Schematic three - dimensional structure diagram of the first locking member in the embodiment of the present invention.

[0035] Each reference numeral is: base 1; mounting groove 101; arc surface 102; moving member, headrest frame 2; accommodating groove 201; convex block 202; 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 member 9; first rotation point 91; avoidance groove 90; first locking portion 10; second locking portion 11; first locking member 12; first transmission column 121; second locking member 13; second transmission column 131; operating member 14; sliding groove 141; first connecting portion 142; first arc surface 143; side wall 144; driving member 15; first waist - shaped groove 151; second waist - shaped groove 152; second connecting portion 153; second arc surface 154; transmission portion 155; meshing teeth 16; headrest frame 17; dial block 18. Detailed implementation manners

[0036] In order to more clearly understand the above - mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0037] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0038] In the description of the present invention, the terms "first", "second", "third", etc. are only used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] The specific implementation manners of the present invention are as follows: As Figure 1-4As shown in the figure, the present invention provides an adjusting device, which includes a base 1, a moving member 2, a motion mechanism, and a locking mechanism. The motion mechanism includes a first link group, a second link group, and a transmission member 9. The two ends of the first link group are respectively rotatably connected to the base 1 and the transmission member 9 to form a first link mechanism. The two ends of the second link group are respectively rotatably connected to the moving member 2 and the transmission member 9 to form a second link mechanism. The motion mechanism is configured to enable the moving member 2 to move relative to the base 1 in at least two directions; The locking mechanism includes a control assembly, a first locking member 12, and a second locking member 13. The control assembly includes an operating member 14 and a driving member 15. The operating member 14 is movably arranged on the moving member 2 or the base 1, and the operating member 14 is in transmission connection with the driving member 15. One of the first link group or the second link group includes a locking link 6, and the other link group has a passive link 4. The driving member 15 is movably arranged on the locking link 6. The locking link 6 and the passive link 4 are rotatably arranged on the transmission member 9 through the same rotating shaft (not shown). Both the first locking member 12 and the second locking member 13 are linked with the driving member 15. A first locking portion 10 is provided on the passive link 4. The first locking member 12 is located beside the first locking portion 10. The first locking member 12 is configured to selectively cooperate with the first locking portion 10 for locking along with the movement of the control assembly. When the first locking member 12 cooperates with the second locking portion 11 for locking, the first link mechanism and the second link mechanism are locked; When the first link mechanism and the second link mechanism are locked, the base 1, the first link assembly, the second link assembly, the transmission member 9, and the moving member 2 form a third link mechanism. A second locking portion 11 is provided on the moving member 2 or the base 1. The second locking member 13 is located beside the second locking portion 11. The second locking member 13 is configured to selectively cooperate with the second locking portion 11 for locking along with the movement of the control assembly. When the second locking member 13 cooperates with the second locking portion 11 for locking, the third link mechanism is locked, and the moving member 2 and the base 1 remain stationary.

[0040] Both the first link mechanism and the second link mechanism are four-bar link mechanisms, and the third link mechanism is a quasi-four-bar link mechanism. When the adjusting device is unlocked, the first link mechanism and the second link mechanism can enable the moving member 2 to move in multiple directions relative to the base 1 and can at least perform position switching within one plane, so as to achieve the adjustment function. When the moving member 2 is moving, the first link mechanism and the second link mechanism jointly form a double four-bar link mechanism. Compared with the prior art, the adjusting device has better adjustment ability, which is mainly reflected in that the movability and flexibility of the moving member 2 are stronger, it can better meet the multi-purpose needs of users, and it is more ergonomic.

[0041] In addition, the locking mechanism of this adjusting device has a simple structure and a clever implementation: The locking link 6 and the passive link 4 are rotatably arranged on the transmission member 9 through the same rotating shaft. That is to say, the first link group and the second link group have a common rotation point (the first rotation point 91) on the transmission member 9, which is the rotation point of the locking link 6 and the passive link 4 on the transmission member 9, and the three are rotatably connected to each other at this point. At this common rotation point, the locking link 6, the passive link 4, and the transmission member 9 all rotate around the same axis. By arranging the first locking portion 10 and the first locking member 12 here, it is possible to simultaneously lock and unlock the first and second link mechanisms.

[0042] Specifically, the driving member 15 is arranged on the locking link 6, and the driving member 15 is linked with the first locking member 12. When the first locking member 12 is locked with the first locking portion 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 respectively. Since both the first link mechanism and the second link mechanism are four-bar link mechanisms, the first link mechanism and the second link mechanism are both locked.

[0043] The third link mechanism is a quasi-four-bar link mechanism. After the first link mechanism and the second link 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 link mechanism can still move. Therefore, the second locking member 13 and the second locking portion 11 on the base 1 or the moving member 2 are required to lock it in order to completely lock the entire adjusting device and keep the moving member 2 and the base 1 stationary.

[0044] Briefly speaking, the first locking member 12 and the first locking portion 10 can simultaneously lock the first and second link mechanisms. At this time, the adjusting device can still move because there is still the third link mechanism. Therefore, the second locking member 13 and the second locking portion 11 are used for locking to finally lock the adjusting device, and 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 conceived, the operation of locking and unlocking is simple and fast, and the supporting effect after locking is excellent.

[0045] A further description of the specific structure of the adjusting device is as follows: Specifically, as Figure 1-7As shown in the figure, the first link group includes a first movable link 3 and a second movable link 4; the second link group includes a third movable link 5 and a fourth movable link 6. The first link mechanism composed of the base 1, the first movable link 3, the second movable link 4 and the transmission member 9 is a four-bar mechanism, and the second link mechanism composed of the transmission member 9, the third movable link 5, the fourth movable link 6 and the moving member 2 is a four-bar 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 link groups. Further, the locking link is the fourth movable link 6, and the passive link is the second movable link 4. Therefore, in this solution, the fourth movable link 6 and the second movable link 4 are rotatably connected to the transmission member 9 at the same rotation point. In terms of position, the lower end of the first movable link 3 is rotatably connected to the rear part of the base 1, the upper end of the first movable link 3 is rotatably connected to the rear part of the transmission member 9, the lower end of the second movable link 4 is rotatably connected to the front part of the base 1, the upper end of the second movable link 4 is rotatably connected to the rear ends of the transmission member 9 and the fourth movable link 6. The second movable link 4 is located on the front side of the first movable link 3 and is closer to the moving member 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 member 2, the rear end of the third movable link 5 is rotatably connected to the upper part of the transmission member 9, the front end of the fourth movable link 6 is rotatably connected to the lower part of the moving member 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. Among them, the positions of the second movable link 4 and the fourth movable link 6 are more suitable for locking. The rotational connections of the movable links are all realized through the rotating shafts at their respective rotation points.

[0046] More specifically, as Figure 8 shown, the transmission member 9 includes a first rotation point 91, a second rotation point, and a third rotation point. The first rotation point 91, the second rotation point, and the third rotation point are distributed in a triangle. The fourth movable link 6 and the second movable link 4 are both rotatably connected to the transmission member 9 at the first rotation point 91, the first movable link 3 is rotatably connected to the transmission member 9 at the second rotation point, and the third movable link 5 is rotatably connected to the transmission member 9 at the third rotation point. This solution is to specifically set three rotation points distributed in a triangle on the transmission member 9 to realize the transmission of the first link mechanism and the second link mechanism. When the first and second link mechanisms are unlocked, they can move together and jointly make the moving member 2 perform multi-dimensional movement. The first rotation point 91 is the common rotation point, and the rotating shaft is arranged here. The transmission member 9 is generally triangular, and an avoidance groove 90 for avoiding the link is opened on the transmission member 9. The shape of the transmission member 9 also corresponds to the distribution of the rotation points, and the avoidance groove 90 can allow the link to move smoothly.

[0047] The first linkage mechanism and the second linkage mechanism are both four-bar linkage mechanisms. The motion of the four-bar linkage mechanism is smoother and more delicate than that of the prior art. Specifically, in a prior art mechanism, two swing rods are sequentially rotatably connected to a base, and the moving member can also move relative to the base in two directions. However, the motion trajectory of this double-swing-rod mechanism is single, the load is concentrated and easy to wear, the motion range is limited by the rod length, and it cannot reach more positions, resulting in poor flexibility. In contrast, the double four-bar linkage mechanism in this solution has a controllable motion trajectory, and complex trajectories such as straight lines, ellipses, and specific curves can be designed. Multiple rods share the load, reducing stress concentration, improving the bearing capacity and service life. More importantly, it has a high degree of customization. After presetting the trajectory according to requirements, the motion range coverage is wider, the motion is delicate and more flexible, generally meeting the needs of users. The four-bar linkage mechanism has obvious advantages in terms of motion complexity, load capacity, dynamic performance, etc. In cases where high requirements are placed on control accuracy and reliability, the four-bar linkage mechanism is a better solution.

[0048] In terms of locking: As shown in Figure 1 , 4 , 5, 16, and 17, when the first linkage mechanism and the second linkage mechanism are locked, the second movable link 4 and the fourth movable link 6 are locked, and the base 1, the first movable link 3, the transmission member 9, the third movable link 5, the moving member 2, and the second movable link 4 and the fourth movable link 6 form a third linkage mechanism. When only the second movable link 4 and the fourth movable link 6 are locked, the third linkage mechanism is still a movable four-bar-like linkage mechanism, and the moving member 2 is not completely locked at this time. Therefore, in addition to locking the first linkage mechanism and the second linkage mechanism, the second locking member 13 and the second locking portion 11 are also required to lock the third linkage mechanism. Moreover, the first locking member 12 and the second locking member 13 are locked or unlocked simultaneously, and the first linkage mechanism, the second linkage mechanism, and the third linkage mechanism will be locked or unlocked synchronously.

[0049] Specifically, the operating member 14 is slidably arranged on the moving member 2. While the user controls the movement of the moving member 2, the user can also control the operating member 14 to switch between the unlocked and locked states, which can be completed with one hand and is more convenient to operate. The middle part of the driving member 15 is rotatably connected to the fourth movable link 6. The two ends of the driving member 15 are respectively in transmission connection with the first locking member 12 and the second locking member 13. The driving member 15 is rotatably arranged on the fourth movable link 6. When the driving member 15 rotates, its two ends rotate together. Since the first and second locking members are in transmission connection with the two ends of the driving member 15, the first and second locking members 12 and 13 will perform locking or unlocking movements together, that is, the state switching of the first, second, and third link mechanisms can be controlled simultaneously, so as to realize the unlocking and locking of the moving member 2 in one step. The driving member 15 is provided with a first waist-shaped groove 151 and a second waist-shaped groove 152. The first locking member 12 is provided with a first transmission post 121, and the second locking member 13 is provided with a second transmission post 131. The first transmission post 121 is inserted into the first waist-shaped groove 151, and the second transmission post 131 is inserted into the second waist-shaped groove 152. The driving member 15 and the locking member are in transmission through the waist-shaped groove and the transmission post, and the structure is simple. Moreover, when the posture of the moving mechanism changes after movement, the transmission post can still remain in the waist-shaped groove.

[0050] One end of the locking link 6 is inserted with a rotating shaft, and the other end of the locking link 6 is inserted with a first rotating shaft (not shown). The locking link 6 is rotatably connected to the base 1 or the moving member 2 through the first rotating shaft. The first locking member 12 is slidably arranged on the rotating shaft, and the second locking member 13 is slidably arranged on the first rotating shaft. In this solution, the locking link is the fourth movable link 6. The fourth movable link 6 is rotatably connected to the moving member 2 through the first rotating shaft. The first locking portion 10 is arranged on the second movable link 4, and the second locking portion 11 is arranged on the moving member 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 realize locking and unlocking. In addition, a circumferential limiting structure needs to be arranged between the first locking member 12 and the second locking member 13 and the locking link 6 to keep the first locking member 12, the second locking member 13 and the locking link 6 rotating synchronously. The circumferential limiting structure can be a convex strip and groove structure, etc. Moreover, since the middle part of the driving member 15 rotates and the two locking members are located on both sides of the driving member 15, when the driving member 15 rotates, the sliding directions of the two locking members are opposite, so the facing directions of the first locking member 12 and the second locking member 13 should also be opposite.

[0051] The locking member and the locking portion achieve selective locking through the meshing teeth 16: A number of meshing teeth 16 are evenly distributed circumferentially on the first locking member 12, the second locking member 13, the first locking portion 10, and the second locking portion 11. The meshing teeth 16 are all located on the end faces of the corresponding components. The first locking member 12 selectively meshes and locks with the first locking portion 10, and the second locking member 13 selectively meshes and locks with the second locking portion 11. The meshing and locking between the locking member and the locking portion are achieved through the meshing teeth 16 evenly distributed circumferentially on the same plane. On the first rotating shaft where the second locking member 13 is installed, there is also a spring (not shown). The spring always gives the second locking member an elastic force towards the second locking portion 11. When the user does not control the movement of the operating member 14, the first and second locking members are always locked with the first and second locking portions. When the user controls the movement of the operating member 14, the driving member 15 rotates and counteracts the spring force to enable locking contact, making the operation easier and simpler.

[0052] In addition, as Figure 9 shown, the first movable link 3 has a curved arc protruding backward, that is, the first movable link 3 bends forward from bottom to top. An installation groove 101 is provided on the base 1. The lower end of the first movable link 3 is arranged in the installation groove 101. The end face of the installation 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. Cooperating with the bent first movable link 3, it can be used to increase the rotation angle to solve the problem that the straight rod is likely to hit the base 1 during accommodation, resulting in movement interference, and the rotatable angle is too small.

[0053] As Figure 1-3 shown in FIGS. 13 - 15, the adjustment device is applied to a headrest. The headrest includes a head support assembly and the above adjustment device. The head support assembly includes a headrest frame 17 and a headrest bracket 2. The headrest frame 17 is rotatably arranged on the headrest bracket 2 around an axis in the left - right direction. The headrest frame 17 is configured to fit and support the human head and neck. The headrest bracket 2 is the aforementioned moving member, and the base 1 is configured to be connected to the backrest 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.

[0054] The headrest is adjusted and supported through the above adjustment device, enabling the headrest to have multi - dimensional movement and variable postures to adapt to the different needs of different users. Users can all obtain more reasonable and comfortable head and neck support, which conforms to ergonomics. The headrest frame 17 can also rotate relative to the headrest bracket 2 to adapt to the curve and tilt angle of the human head and neck. When the headrest bracket 2 is locked, the movement of the headrest frame 17 is also locked. In addition, the headrest frame 17 can also rotate adaptively relative to the headrest bracket 2 to fit the human head and neck. Even if the movement of the headrest frame 17 is locked, the headrest frame 17 can still rotate. This adjustment device can also be applied to lumbar supports.

[0055] In addition, asFigure 10 As shown, a receiving groove 201 is formed in the headrest frame 2, and the operating member 14 is slidably disposed in the receiving groove 201. A convex block 202 protruding downward is provided on the headrest frame 2, and a through groove 141 is provided in the operating member 14 in the vertical direction. The convex block 202 is inserted into the through groove 141, so that the operating member 14 slides on the headrest frame 2 more stably. Further, a dial 18 is further provided on the operating member 14. The headrest frame 2 includes two arms 21 that diverge left and right. A window 22 is formed in one of the arms 21. The dial 18 passes through the window 22 and is connected to the operating member 14, making the operation more convenient.

[0056] As Figure 11 , 12 shown, the driving member 15 is rotatably disposed on the fourth movable link 6, and the operating member 14 is movably disposed on the headrest frame 2. The operating member 14 is in transmission connection with the driving member 15. However, 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 member 15 and the operating member 14 needs to adapt to the rotation of the fourth movable link 6 and the headrest frame 2. Specifically, a first connection portion 142 is provided at the rear end of the operating member 14, and a second connection portion 153 is provided at the front end of the driving member 15. A first arc surface 143 is provided on the first connection portion 142 facing the second connection portion 153, and a second arc surface 154 is correspondingly provided on the second connection portion 153. The two cooperate with each other so that the driving member 15 and the operating member 14 can adapt to the relative rotation of the fourth movable link 6 and the headrest frame 2. A groove is formed in the first arc surface 143 on the first connection portion 142, and two side walls 144 are formed in the groove. The side walls 144 are naturally located beside the first arc surface 143 and are more forward relative to the first arc surface 143. A spherical transmission portion 155 protrudes from the second arc surface 154 of the second connection portion 153. The spherical transmission portion 155 protrudes forward from the second arc surface 154 and is exactly located between the two side walls 144. When the headrest frame 2 and the fourth movable link 6 rotate, the transmission portion 155 rotates between the two side walls 144, and the two are configured to abut and transmit. That is, when the operating member 14 slides, the transmission portion 155 can be pushed by the side walls 144 at any position of the side walls 144, so that the sliding of the operating member 14 can always be transmitted to the driving member 15.

Claims

1. A regulating device, characterized in that: It includes a base, a moving part, a moving mechanism and a locking mechanism, the moving mechanism includes a first connecting rod group, a second connecting rod group and a transmission member, two ends of the first connecting rod group are respectively connected to the base and the transmission member to form a first connecting rod mechanism, two ends of the second connecting rod group are respectively connected to the moving part and the transmission member to form a second connecting rod mechanism, and the moving mechanism is configured to enable the moving part to move in at least two directions relative to the base; The locking mechanism comprises a control assembly, a first locking member and a second locking member, the control assembly comprises an operating member and a driving member, the operating member is movably arranged on the moving member or the base, and the operating member is in transmission connection with the driving member; the first link group or the second link group comprises a locking link, and the other link group has a passive link, the driving member is movably arranged on the locking link, and the locking link and the passive link are rotatably arranged on the transmission member through the same rotating shaft; the first locking member and the second locking member are both linked with the driving member, a first locking portion is arranged on the passive link, the first locking member is located beside the first locking portion, and the first locking member is configured to selectively cooperate with the first locking portion to lock with the movement of the control assembly, and when the first locking member cooperates with the second locking portion to lock, the first link mechanism and the second link mechanism are locked; When the first link mechanism and the second link mechanism are locked, the base, the first link assembly, the second link assembly, the transmission part, and the moving part form a third link mechanism. A second locking part is provided on the moving part or the base. The second locking part is located beside the second locking part. The second locking part is configured to selectively cooperate with the second locking part to lock with the movement of the control component. When the second locking part cooperates with the second locking part to lock, the third link mechanism is locked, and the moving part and the base remain stationary.

2. The adjusting device according to claim 1, characterized in that: The first link group includes a first movable link and a second movable link; the second link group includes a third movable link and a third movable link; the first link mechanism composed of the base, the first movable link, the second movable link and the transmission part is a four-bar mechanism; the second link mechanism composed of the transmission part, the third movable link, the fourth movable link and the moving part is a four-bar 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 link groups.

3. The adjusting device according to claim 2, characterized in that: The locking link is the fourth movable link, and the passive link is the second movable link.

4. The adjusting device according to claim 3, characterized in that: 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.

5. The adjusting device according to claim 3, characterized in that: The transmission member includes a first rotation point, a second rotation point and a third rotation point, and the first rotation point, the second rotation point and the third rotation point are distributed in a triangle; the fourth movable link and the second movable link are both rotationally connected to the transmission member at the first rotation point, the first movable link is rotationally connected to the transmission member at the second rotation point, and the third movable link is rotationally connected to the transmission member at the third rotation point.

6. The adjusting device according to claim 2, characterized in that: When the first link mechanism and the second link mechanism are locked, the second movable link and the fourth movable link are locked, and the base, the first movable link, the transmission member, the third movable link, the moving member, the second movable link and the fourth movable link form a third link mechanism.

7. The adjusting device according to claim 2, characterized in that: The middle part of the driving member is rotatably connected to the fourth movable connecting rod, and the two ends of the driving member are respectively transmission-connected to the first locking member and the second locking member.

8. The adjusting device according to claim 1, characterized in that: The transmission member includes a first rotation point, a second rotation point and a third rotation point, and the first rotation point, the second rotation point and the third rotation point are distributed in a triangle; the locking link and the passive link are both rotationally connected to the transmission member at the first rotation point, the other link of the first link group is rotationally connected to the transmission member at the second rotation point, and the other link of the second link group is rotationally connected to the transmission member at the third rotation point.

9. The adjusting device according to claim 8, characterized in that: The transmission member is roughly triangular in shape and is provided with an avoidance groove for avoiding the connecting rod.

10. The adjusting device according to claim 1, characterized in that: The operating member is slidably arranged on the moving member.

11. The adjusting device according to claim 1, characterized in that: The middle part of the driving member is rotatably connected to the locking link, and the two ends of the driving member are respectively transmission-connected to the first locking member and the second locking member. When the driving member rotates, the movement of the first locking member and the second locking member is controlled simultaneously.

12. The adjusting device according to claim 11, characterized in that: The driving member is provided with a first waist-shaped groove and a second waist-shaped groove, 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 in the first waist-shaped groove, and the second transmission column is inserted in the second waist-shaped groove.

13. The adjusting device according to claim 1, characterized in that: A rotating shaft is inserted at one end of the locking link, and a first rotating shaft is inserted at the other end of the locking link. The locking link is rotatably connected to the base or the moving part through the first rotating shaft; the first locking member is slidably set on the rotating shaft, and the second locking member is slidably set on the first rotating shaft.

14. The adjusting device according to claim 1, characterized in that: The first locking piece, the second locking piece, the first locking portion and the second locking portion are all uniformly distributed with a plurality of meshing teeth along the circumferential direction; the first locking piece is selectively meshed and locked with the first locking portion; and the second locking piece is selectively meshed and locked with the second locking portion.

15. A headrest, characterized in that: It includes a head support component and an adjustment device as described in any one of claims 1 to 14, the head support component includes a pillow frame and a pillow frame, the pillow frame is rotatably arranged on the pillow frame around an axis in the left-right direction; the pillow frame is configured to fit and support the head and neck of a human body, the pillow frame is the moving part, and the base is configured to be connected to the backrest of the seat; when the pillow frame moves relative to the base, the pillow frame drives the pillow frame to move together.

16. The headrest according to claim 15, characterized in that: A receiving groove is provided on the pillow frame, and the operating member is slidably arranged in the receiving groove.

17. The headrest according to claim 16, characterized in that: The pillow frame is provided with a convex block, the operating part is provided with a sliding groove, and the convex block is inserted in the sliding groove.

18. The headrest according to claim 15, characterized in that: The operating part is also provided with a shifting block, and the pillow frame comprises two supporting arms which are separated from each other, one of the supporting arms is provided with a window, and the shifting block passes through the window and is connected with the operating part.

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