Multi-dimensional movement mechanism and headrest

Abstract

The utility model provides a multi-dimensional movement mechanism and a headrest. The mechanism comprises a base, a first connecting rod group, a second connecting rod group, a transmission part and a movement part, the two ends of the first connecting rod set are rotationally connected with the base and the transmission piece correspondingly to form a first four-connecting-rod mechanism. The two ends of the second connecting rod set are rotationally connected with the moving part and the transmission part respectively to form a second four-connecting-rod mechanism, and the second four-connecting-rod mechanism can enable the moving part to move in at least two directions relative to the base to achieve flexible displacement in the plane. The headrest comprises the mechanism, and the headrest is subjected to motion adjustment and supporting through the mechanism, so that the headrest has multi-dimensional motion and changeable postures; complex track output is achieved through cooperation of multiple rods, multi-dimensional precise movement is achieved in a compact space and the dynamic performance of the headrest is improved through coupling of double four-bar mechanisms, flexibility is high, and the headrest is more in line with ergonomics.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of seat, especially a multi-dimensional motion mechanism and headrest. BACKGROUND

[0002] In the headrest of the seat, the prior art generally adopts single or double freedom degree motion mechanism to realize the position adjustment of the headrest. The traditional scheme is mostly based on the hinge type structure or single pendulum rod design, for example, a single direction position adjustment is realized by setting a rotatable or sliding connecting piece on the base. However, such mechanism has the problems of single motion trajectory and limited adjustment dimension, and it is difficult to meet the needs of users for multi-dimensional compound adjustment of the height, front and back position and inclination angle of the headrest. Especially when the user needs to adapt to different body types or sitting postures, the adjustment flexibility and position coverage range of the existing structure are significantly insufficient, resulting in poor ergonomic adaptability.

[0003] Further, part of the improved scheme adopts a double pendulum rod mechanism (such as setting two sections of serial rotating rods between the base and the moving piece), trying to realize the motion in two-dimensional plane through the combination of rod length. But such structure exposes the following core defects in actual application: (1) the motion trajectory is strictly limited by the rod length ratio and the position of the connecting point, only a fixed circular arc path can be realized, and a straight line, an ellipse or other complex trajectories cannot be formed; (2) the load is concentrated at the single rod hinge, which easily causes stress concentration and local wear, reducing the service life of the structure; (3) the motion range is limited by the physical size of the pendulum rod, and it is difficult to expand the effective stroke in the limited installation space. These problems result in the existing double rod mechanism still having the pain points of low adjustment accuracy, insufficient reliability and poor user adaptability in actual use.

[0004] In view of the above technical bottleneck, the field urgently needs a mechanism with multi-dimensional motion capability, high bearing characteristics and customizable trajectory to solve the problems of motion performance of components such as headrest, waistrest and the like. SUMMARY

[0005] To solve the above technical problems, the utility model provides a kind of mechanism of multidimensional movement, including base, first connecting rod group, second connecting rod group, transmission part and moving piece.The two ends of first connecting rod group are rotatably connected with base and transmission part respectively, forming first four-bar linkage mechanism;The two ends of second connecting rod group are rotatably connected with moving piece and transmission part respectively, forming second four-bar linkage mechanism, which can make moving piece move relative to base at least in two directions, realize flexible displacement in plane.Compared with the mechanism of the existing base connected double swing rod, the double four-bar linkage mechanism of the present scheme is controllable, and complex trajectories such as straight line and ellipse can be designed, multiple rods share load, reduce stress concentration, improve load capacity and service life.In addition, it has high degree of customization, wider range of motion, strong flexibility, significant advantages in motion complexity, load capacity, etc., can better meet the needs of users, and is more in line with ergonomics.

[0006] Further provided is a headrest, which applies the above mechanism to the headrest, realizes complex trajectory output through multi-rod cooperation, realizes multidimensional precision motion in compact space and improves the dynamic performance of the headrest through the coupling of double four-bar linkage mechanism.

[0007] The technical scheme of the utility model is as follows:

[0008] A kind of mechanism of multidimensional movement, including base, first connecting rod group, second connecting rod group, transmission part and moving piece, the two ends of first connecting rod group are rotatably connected with base and transmission part respectively and form first four-bar linkage mechanism, the two ends of second connecting rod group are rotatably connected with moving piece and transmission part respectively and form second four-bar linkage mechanism, moving mechanism is configured to enable moving piece to move relative to base at least in two directions.

[0009] Moving piece can move relative to base at least in two directions, that is, it can move in a plane, such as up and down, front and back, two directions are displaced simultaneously;When moving piece moves, double four-bar linkage mechanism formed by first four-bar linkage mechanism and second four-bar linkage mechanism follows, compared with prior art, moving piece is more movable and flexible, it is easier to adjust to the position that user wants, it can better meet the needs of users, and it is more in line with ergonomics.

[0010] Specifically, in one mechanism of the prior art, two swing rods are sequentially rotationally connected on the base, and the movement of the moving part relative to the base in two directions can also be achieved, but the single movement trajectory of the double swing rod form of the mechanism is easy to wear and tear, the movement range is limited by the length of the rod, and more positions cannot be reached, and the flexibility is poor; the double four-bar linkage mechanism of the present scheme has a controllable movement trajectory, can design complex trajectories such as straight lines, ellipses, and specific curves, multiple rods share the load, reduce stress concentration, improve load capacity and service life, and more importantly, the degree of customization is high, after the preset trajectory is set according to the requirements, the movement range covers a wider range, the movement is delicate and more flexible, and the user's requirements are generally met; the four-bar linkage mechanism has obvious advantages in movement complexity, load capacity, and dynamic performance, and in the case of high requirements for control accuracy and reliability, the four-bar linkage mechanism is a better solution.

[0011] As a preferred, the first linkage group comprises a first movable linkage, a second movable linkage, the second linkage group comprises a third movable linkage, a fourth movable linkage; the lower end of the first movable linkage is rotationally connected with the rear part of the base, the upper end of the first movable linkage is rotationally connected with the transmission part, the lower end of the second movable linkage is rotationally connected with the front part of the base, the upper end of the second movable linkage is rotationally connected with the transmission part; the front end of the third movable linkage is rotationally connected with the moving part, the rear end of the third movable linkage is rotationally connected with the transmission part, the front end of the fourth movable linkage is rotationally connected with the lower part of the moving part, and the rear end of the fourth movable linkage is rotationally connected with the transmission part.

[0012] As a preferred, the transmission part is provided with four rotation points, and the first, second, third, and fourth movable linkages are rotationally connected at the four rotation points, respectively.

[0013] As a preferred, the transmission part is provided with three rotation points, the first and third movable linkages are rotationally connected at two of the rotation points, and the second and fourth movable linkages are rotationally connected at the other rotation point. When the transmission part has only three rotation points, the movement is smoother, and it is more suitable for deploying the trajectory and range of the movement of components such as headrests and waist rests.

[0014] As a preferred, the transmission part is substantially triangular, and the transmission part is provided with an avoidance slot for avoiding the linkages. The shape of the transmission part is adapted to the three rotation points, and the avoidance slot allows the linkages to rotate without obstruction.

[0015] As a preferred, the transmission part is provided with two rotation points, the first and third movable linkages are rotationally connected at one of the rotation points, and the second and fourth movable linkages are rotationally connected at the other rotation point. The transmission part provided with four or two rotation points can also achieve movement, but from the effect, the transmission part with three rotation points is better.

[0016] As preferred, the first movable connecting rod has a rearward convex curved arc.

[0017] As preferred, a mounting groove is formed on the base, the lower end of the first movable connecting rod is arranged in the mounting groove, and the end face of the mounting groove away from the first movable connecting rod is an arc face.

[0018] As preferred, the first connecting rod group end and the second connecting rod group end are both provided with a damping piece.

[0019] A headrest comprises a head support assembly and the mechanism, the head support assembly comprises a headrest frame and a headrest holder, the headrest frame is rotationally arranged on the headrest holder around 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 holder is the moving piece, and the base is configured to be connected with the back of a seat; when the headrest holder moves relative to the base, the headrest holder drives the headrest frame to move together.

[0020] The headrest is adjusted and supported by the mechanism, so that the headrest has multi-dimensional movement and variable posture to adapt to different needs of different users, and each user can obtain more reasonable and comfortable head and neck support, which is in line with ergonomics; the headrest frame can also rotate relative to the headrest holder to adapt to the curve and inclination angle of the head and neck of the human body.

[0021] The design starting point, concept and beneficial effects of the headrest are as follows:

[0022] The moving piece can move relative to the base in at least two directions, that is, it can move in one plane, such as up and down and forward and backward, and displacement occurs in two directions at the same time; when the moving piece moves, the double four-bar linkage mechanism formed by the first four-bar linkage mechanism and the second four-bar linkage mechanism follows, compared with the prior art, the moving piece has stronger mobility and flexibility, is more easily adjusted to the position desired by the user, better meets the various needs of the user, and is more in line with ergonomics.

[0023] Specifically, in one mechanism of the prior art, two swing rods are sequentially rotationally connected on the base, and the movement of the moving part relative to the base in two directions can also be achieved, but the single movement trajectory of the double swing rod form mechanism is easy to wear due to concentrated load, the movement range is limited by the length of the rod, cannot reach more positions, and the flexibility is poor; the double four-bar linkage mechanism of the present scheme has a controllable movement trajectory, can be designed to have a straight line, an ellipse, a specific curve and other complex trajectories, the multiple rods share the load, the stress concentration is reduced, the carrying capacity and service life are improved, more importantly, the degree of customization is high, after the preset trajectory is set according to the requirement, the movement range covers a wider range, the movement is delicate and more flexible, and the requirements of users are generally met; the four-bar linkage mechanism has obvious advantages in movement complexity, load capacity and dynamic performance, and in the case of high requirements for control accuracy and reliability, the four-bar linkage mechanism is a better solution. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A three-dimensional structure schematic view of the headrest relative to the base after movement is shown in the embodiment of the present application.

[0025] Figure 2 A three-dimensional structure schematic view of the headrest relative to the base after movement is shown in the embodiment of the present application. Figure 1 Figure 1 ;

[0026] Figure 3 A three-dimensional structure schematic view of the headrest relative to the base after movement is shown in the embodiment of the present application. Figure 1 Figure 2 ;

[0027] Figure 4 A three-dimensional structure schematic view of the headrest relative to the base after movement is shown in the embodiment of the present application.

[0028] Figure 5 A three-dimensional structure schematic view of the headrest relative to the base after movement is shown in the embodiment of the present application.

[0029] Figure 6 A three-dimensional structure schematic view of the headrest relative to the base after movement is shown in the embodiment of the present application. Figure 5 Figure 1 ;

[0030] Figure 7 A three-dimensional structure schematic view of the headrest relative to the base after movement is shown in the embodiment of the present application. Figure 5 Figure 2 ;

[0031] Figure 8 A three-dimensional structure schematic view of the headrest relative to the base after movement is shown in the embodiment of the present application.

[0032] Figure 9 ​​​​The utility model discloses a three-dimensional structure schematic diagram of base in the embodiment of the utility model;

[0033] Figure 10 The utility model discloses a three-dimensional structure schematic diagram of moving part, backrest frame in the embodiment of the utility model;

[0034] Figure 11 The utility model discloses a three-dimensional structure schematic diagram of driving part and operating part transmission connection in the embodiment of the utility model;

[0035] Figure 12 The utility model discloses a three-dimensional structure schematic diagram of driving part and operating part transmission connection in the embodiment of the utility model;

[0036] Figure 13 The utility model discloses a three-dimensional structure schematic diagram of driving part and operating part transmission connection in the embodiment of the utility model;

[0037] Figure 14 The utility model discloses a three-dimensional structure schematic diagram of locking part and locking portion in the embodiment of the multi -dimensional movement mechanism of the utility model;

[0038] Figure 15 The utility model discloses a three-dimensional structure schematic diagram of first locking part in the embodiment of the utility model.

[0039] The reference numerals are: base 1, mounting groove 101, camber surface 102, moving part, backrest frame 2, accommodating groove 201, lug 202, support arm 21, window 22, first movable connecting rod 3, second movable connecting rod, passive connecting rod 4, third movable connecting rod 5, fourth movable connecting rod, locking connecting rod 6, transmission part 9, first rotation point 91, avoiding groove 90, first locking portion 10, second locking portion 11, first locking part 12, first transmission column 121, second locking part 13, second transmission column 131, operating part 14, sliding slot 141, first link portion 142, first arc surface 143, side wall 144, driving part 15, first waist type groove 151, second waist type groove 152, second link portion 153, second arc surface 154, transmission portion 155, meshing tooth 16, backrest frame 17, push block 18. DETAILED DESCRIPTION

[0040] In order to enable the above-mentioned purpose, features and advantages of the utility model to be more clearly understood, the utility model will be further described in detail below in conjunction with the drawings and specific embodiments. It should be explained that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0042] In the description of the utility model, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0043] The specific implementation manner of the utility model is as follows:

[0044] As Figures 1-4 shown, the utility model provides a kind of mechanism of multidimensional motion, including pedestal 1, moving piece 2 and locking mechanism.It also includes first connecting rod group, second connecting rod group and transmission piece 9, two ends of first connecting rod group are rotatably connected with pedestal 1, transmission piece 9 and form first four-bar linkage mechanism, two ends of second connecting rod group are rotatably connected with moving piece 2, transmission piece 9 and form second four-bar linkage mechanism, so that moving piece 2 can be moved at least in two directions relative to pedestal 1;

[0045] Locking mechanism includes control assembly, first locking piece 12 and second locking piece 13.Control assembly includes operating piece 14 and driving piece 15, operating piece 14 is movably arranged on moving piece 2 or pedestal 1, operating piece 14 is in transmission connection with driving piece 15.First connecting rod group or second connecting rod group includes a locking connecting rod 6, another connecting rod group has a passive connecting rod 4, driving piece 15 is movably arranged on locking connecting rod 6, locking connecting rod 6 and passive connecting rod 4 are rotatably arranged on transmission piece 9 by same rotating shaft (not shown).First locking piece 12 and second locking piece 13 are linked with driving piece 15, first locking piece 12 is located on the side of first locking portion 10, first locking piece 12 is configured to selectively cooperate with first locking portion 10 and lock with the movement of control assembly, when first locking piece 12 cooperates with second locking portion 11 and locks, first four-bar linkage mechanism and second four-bar linkage mechanism are locked;

[0046] When first four-bar linkage mechanism and second four-bar linkage mechanism are locked, pedestal 1, first connecting rod assembly, second connecting rod assembly, transmission piece 9, moving piece 2 form third connecting rod mechanism, second locking portion 11 is arranged on moving piece 2 or pedestal 1, second locking piece 13 is located on the side of second locking portion 11, second locking piece 13 is configured to selectively cooperate with second locking portion 11 and lock with the movement of control assembly, when second locking piece 13 cooperates with second locking portion 11 and locks, third connecting rod mechanism is locked, moving piece 2 and pedestal 1 remain stationary.

[0047] The first four-bar linkage and the second four-bar linkage are four-bar linkages, and the third linkage is a four-bar linkage. When unlocked, the first four-bar linkage and the second four-bar linkage can produce multi-directional movement of the moving part 2 relative to the base 1, and at least position switching in a plane, so as to realize the adjustment function. When the moving part 2 moves, the first four-bar linkage and the second four-bar linkage jointly form a double four-bar linkage. Compared with the prior art, the adjustment capability of the multi-dimensional movement mechanism is better, mainly reflected in the mobility and flexibility of the moving part 2, which can better meet the multi-use needs of users and be more in line with ergonomics.

[0048] In addition, the locking mechanism is simple in structure and ingenious in implementation.

[0049] The locking linkage 6 and the passive linkage 4 are rotatably arranged on the transmission part 9 through the same rotation shaft, that is, the first linkage group and the second linkage group have a common rotation point (the first rotation point 91) on the transmission part 9, that is, the rotation points of the locking linkage 6 and the passive linkage 4 on the transmission part 9, and the three are rotatably connected at the point. At the common rotation point, the locking linkage 6, the passive linkage 4 and the transmission part 9 all rotate around the same axis, and the first locking part 10 and the first locking part 12 are arranged at the common rotation point, so as to realize simultaneous locking and unlocking of the first and second two linkage mechanisms.

[0050] Specifically, the driving part 15 is arranged on the locking linkage 6, and the driving part 15 is linked with the first locking part 12. When the first locking part 12 is locked with the first locking part 10 on the passive linkage 4, the passive linkage 4 is also locked with the driving part 15, and the passive linkage 4 is also locked with the locking linkage 6. The passive linkage 4 and the locking linkage 6 cannot rotate relative to the transmission part 9. Since the first four-bar linkage and the second four-bar linkage are four-bar linkages, the first four-bar linkage and the second four-bar linkage are locked.

[0051] The third linkage is a four-bar linkage. After the first four-bar linkage and the second four-bar linkage are locked, the locking linkage 6 and the passive linkage 4 are equivalent to the same linkage, and the mechanism formed by the first linkage group and the second linkage group cannot move respectively, but the third linkage can still move. Therefore, the second locking part 11 on the base 1 or the moving part 2 needs to be locked by the second locking part 13 to completely lock the entire multi-dimensional movement mechanism and keep the moving part 2 and the base 1 stationary.

[0052] In brief, the first locking member 12 and the first locking portion 10 can lock the first and second four-bar linkage mechanisms simultaneously, at this time, the multi-dimensional motion mechanism can still move because the third linkage mechanism exists, and then the second locking member 13 and the second locking portion 11 are locked to finally realize the locking of the multi-dimensional motion mechanism, and the first locking member 12 and the second locking member 13 are controlled and realized by the control assembly. Therefore, the locking mechanism has the advantages of ingenious structure, simple and fast locking and unlocking operation, and excellent supporting effect after locking.

[0053] The specific structure of the multi-dimensional motion mechanism is further described as follows:

[0054] Specifically, as shown in Figures 1-7 the first linkage group includes the first movable linkage 3 and the second movable linkage 4, and the second linkage group includes the third movable linkage 5 and the fourth movable linkage 6. The first four-bar linkage mechanism composed of the base 1, the first movable linkage 3, the second movable linkage 4 and the transmission member 9 is a four-bar linkage mechanism, and the second four-bar linkage mechanism composed of the transmission member 9, the third movable linkage 5, the fourth movable linkage 6 and the moving member 2 is a four-bar linkage mechanism. The locking linkage is any one of the first, second, third and fourth movable linkages, and the passive linkage is in a different linkage group from the locking linkage. Further, the locking linkage is the fourth movable linkage 6, and the passive linkage is the second movable linkage 4, so in this scheme, the fourth movable linkage 6 and the second movable linkage 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 linkage 3 is rotatably connected to the rear part of the base 1, the upper end of the first movable linkage 3 is rotatably connected to the rear part of the transmission member 9, the lower end of the second movable linkage 4 is rotatably connected to the front part of the base 1, the upper end of the second movable linkage 4 is rotatably connected to the rear end of the transmission member 9 and the fourth movable linkage 6, the second movable linkage 4 is located on the front side of the first movable linkage 3, and the second movable linkage 4 is closer to the moving member 2 than the first movable linkage 3. The front end of the third movable linkage 5 is rotatably connected to the upper part of the moving member 2, the rear end of the third movable linkage 5 is rotatably connected to the upper part of the transmission member 9, the front end of the fourth movable linkage 6 is rotatably connected to the lower part of the moving member 2, the fourth movable linkage 6 is located below the third movable linkage 5, and the fourth movable linkage 6 is closer to the base 1 than the third movable linkage 5. Among them, the positions of the second movable linkage 4 and the fourth movable linkage 6 are more suitable for locking. The rotatable connections of the movable linkages are realized through the rotation shafts of the respective rotation points.

[0055] More specifically, as shown in Figure 8As shown, the transmission member 9 includes a first rotation point 91, a second rotation point and a third rotation point, which are in a triangular distribution. The fourth movable connecting rod 6 and the second movable connecting rod 4 are rotationally connected to the first rotation point 91 and the transmission member 9, the first movable connecting rod 3 is rotationally connected to the second rotation point and the transmission member 9, and the third movable connecting rod 5 is rotationally connected to the third rotation point and the transmission member 9. This scheme specifically provides three rotation points in a triangular distribution on the transmission member 9 to realize the transmission of the first four-bar linkage mechanism and the second four-bar linkage mechanism. When the first and second four-bar linkage mechanisms are unlocked, they can move together and jointly make the moving member 2 move in multiple dimensions. The first rotation point 91 is the common rotation point, and the rotation shaft is arranged at this point. The transmission member 9 is roughly triangular, and the transmission member 9 is provided with a avoiding slot 90 for avoiding the connecting rod. The shape of the transmission member 9 also corresponds to the distribution of the rotation points, and the avoiding slot 90 can make the connecting rod move smoothly.

[0056] The transmission member 9 with four or two rotation points can also realize movement, but in terms of effect, the transmission member 9 with three rotation points is better, so the transmission member 9 with three rotation points is adopted in this embodiment.

[0057] The first four-bar linkage mechanism and the second four-bar linkage mechanism are both four-bar linkage mechanisms, and the movement of the four-bar linkage mechanism is more delicate and smooth than that of the prior art. Specifically, in one mechanism of the prior art, two swing rods are sequentially rotationally connected to the base, and the movement of the moving member relative to the base in two directions can also be realized. However, this double-swing-rod mechanism has a single movement trajectory, the load is concentrated and easy to wear, the movement range is limited by the length of the rod, cannot reach more positions, and has poor flexibility. However, the double four-bar linkage mechanism of the present scheme has a controllable movement trajectory, can design complex trajectories such as straight lines, ellipses and specific curves, multiple rods share the load, reduce stress concentration, improve load capacity and service life, and more importantly, has high customizability. After presetting the trajectory according to the requirements, the movement range covers a wider range, the movement is delicate and more flexible, and generally meets the user's requirements. The four-bar linkage mechanism has obvious advantages in movement complexity, load capacity and dynamic performance, and is a better solution in the case of high requirements for control accuracy and reliability.

[0058] In the locking aspect: Figure 1 , 4When the first four-bar linkage and the second four-bar linkage are locked, the second movable link 4 and the fourth movable link 6 are locked, 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. When only the second movable link 4 and the fourth movable link 6 are locked, the third linkage is still a movable four-bar linkage, and the moving member 2 is not completely locked at this time. Therefore, in addition to locking the first four-bar linkage and the second four-bar linkage, the second locking member 13 and the second locking portion 11 are also needed to lock the third linkage. Moreover, the first locking member 12 and the second locking member 13 are simultaneously locked or unlocked, and the first four-bar linkage, the second four-bar linkage and the third linkage are synchronously locked or unlocked.

[0059] Specifically, the operating member 14 is slidingly arranged on the moving member 2, and the user can control the operating member 14 to switch between the unlocked and locked states while controlling the movement of the moving member 2, which can be completed by one hand, and the operation is more convenient. The middle part of the driving member 15 is rotatably connected to the fourth movable link 6, and 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, and when the driving member 15 rotates, the two ends thereof 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 the locking or unlocking movement together, that is, the state switching of the first, second and third linkages can be controlled at the same time, so that the unlocking and locking of the moving member 2 can be achieved in one step. The first waist-shaped groove 151 and the second waist-shaped groove 152 are formed in the driving member 15, the first transmission column 121 is arranged on the first locking member 12, and the second transmission column 131 is arranged on the second locking member 13. 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 member 15 and the locking member are in transmission through the waist-shaped grooves and the transmission columns, and the structure is simple. Moreover, in the case that the moving mechanism changes its posture after movement, the transmission column can still remain in the waist-shaped groove.

[0060] One end of the locking link 6 is provided with a rotating shaft, and the other end of the locking link 6 is provided with a first rotating shaft (not shown), and the locking link 6 is rotatably connected with the base 1 or the moving part 2 through the first rotating shaft. The first locking part 12 is slidably arranged on the rotating shaft, and the second locking part 13 is slidably arranged on the first rotating shaft. In this scheme, the locking link is the fourth movable link 6, and the fourth movable link 6 is rotatably connected with the moving part 2 through the first rotating shaft, and the first locking part 10 is arranged on the second movable link 4, and the second locking part 11 is arranged on the moving part 2. Under the action of the driving part 15, the first locking part 12 and the second locking part 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 part 12, the second locking part 13 and the locking link 6 to keep the synchronous rotation of the first locking part 12, the second locking part 13 and the locking link 6. The circumferential limiting structure can be a convex groove structure and the like. Moreover, since the middle part of the driving part 15 rotates, the two locking parts are located on the two sides of the driving part 15, so when the driving part 15 rotates, the sliding directions of the two locking parts are opposite, and therefore the orientation directions of the first locking part 12 and the second locking part 13 should also be opposite.

[0061] The locking part and the locking part are selectively locked by the meshing teeth 16: the first locking part 12, the second locking part 13, the first locking part 10 and the second locking part 11 are uniformly distributed with a plurality of meshing teeth 16 in the circumferential direction, and the meshing teeth 16 are located on the end face of the component. The first locking part 12 and the first locking part 10 are selectively meshed and locked, and the second locking part 13 and the second locking part 11 are selectively meshed and locked. The meshing and locking of the locking part and the locking part are realized by the meshing teeth 16 uniformly distributed in the circumferential direction on the same plane. A spring (not shown) is also sleeved on the first rotating shaft on which the second locking part 13 is installed, and the spring always gives the second locking part a spring force towards the second locking part 11. When the user does not control the operation part 14 to move, the first and second locking parts are always locked with the first and second locking parts. When the user controls the operation part 14 to move, the driving part 15 rotates and counteracts the spring force to make the locking contact, so that the operation becomes more easy and simple.

[0062] Of course, a damping piece can also be arranged at the end of each movable link to realize the effect of keeping still after moving.

[0063] In addition, as Figure 9As shown, the first movable link 3 has a rearward convex curved arc, that is, the first movable link 3 is curved from bottom to top and forward. The base 1 is provided with a mounting groove 101, and the lower end of the first movable link 3 is arranged in the mounting groove 101. The end surface of the mounting groove 101 away from the first movable link 3 is an arc surface 102, which is adapted to the curvature of the first movable link 3. The curved first movable link 3 can be used to increase the rotation angle, so as to solve the problem that the straight rod is accommodated to hit the base 1, causing motion interference, and the rotatable angle is too small.

[0064] As shown in Figures 1-3 , 13, the multi-dimensional motion mechanism is applied to a headrest. The headrest comprises a head support assembly and the multi-dimensional motion mechanism. The head support assembly comprises a headrest frame 17 and a headrest support 2. The headrest frame 17 is arranged to be in contact with and support the head and neck of a human body. The headrest support 2 is the moving part, and the base 1 is arranged to be connected with the back of a seat. When the headrest support 2 moves relative to the base 1, the headrest frame 17 moves together with the headrest support 2.

[0065] The headrest is adjusted and supported by the multi-dimensional motion mechanism, so that the headrest has multi-dimensional motion and variable posture to adapt to different needs of different users. The users can obtain more reasonable and comfortable support for the head and neck, and the headrest conforms to ergonomics. The headrest frame 17 can also rotate relative to the headrest support 2 to adapt to the curve and inclination angle of the head and neck of the human body. When the headrest support 2 is locked, the movement of the headrest frame 17 is also locked. In addition, the headrest frame 17 can also rotate relative to the headrest support 2 to adapt to the head and neck of the human body. Even if the movement of the headrest frame 17 is locked, the headrest frame 17 can still rotate. The multi-dimensional motion mechanism can also be applied to a waist rest.

[0066] In addition, as shown in Figure 10 , the headrest support 2 is provided with a receiving groove 201, and the operating part 14 is slidingly arranged in the receiving groove 201. The headrest support 2 is provided with a protrusion 202 protruding downward, and the operating part 14 is provided with a sliding groove 141 penetrating upward and downward. The protrusion 202 is inserted into the sliding groove 141, so that the operating part 14 is more stably sliding on the headrest support 2. Further, the operating part 14 is further provided with a knob 18, and the headrest support 2 comprises two branch arms 21 diverging left and right. One of the branch arms 21 is provided with a window 22, and the knob 18 is connected with the operating part 14 through the window 22. The knob 18 makes the operation more convenient.

[0067] As shown in Figure 11 , 12As shown, the driving member 15 is rotatably arranged on the fourth movable link 6, and the operating member 14 is movably arranged on the headrest frame 2. The operating member 14 is in transmission connection with the driving member 15, but the headrest frame 2 and the fourth movable link 6 are relatively rotatable. 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, the rear end of the operating member 14 is provided with a first connecting part 142, and the front end of the driving member 15 is provided with a second connecting part 153. The first connecting part 142 is provided with a first arc surface 143 facing the second connecting part 153, and the second connecting part 153 is correspondingly provided with a second arc surface 154. The two arc surfaces are matched with each other to enable the driving member 15 and the operating member 14 to adapt to the relative rotation of the fourth movable link 6 and the headrest frame 2. The first arc surface 143 is slotted on the first connecting part 142, and two side walls 144 are formed in the slot. The side walls 144 are naturally located on the side of the first arc surface 143 and are more forward relative to the first arc surface 143. The second arc surface 154 of the second connecting part 153 is provided with a spherical transmission part 155. The spherical transmission part 155 protrudes forward from the second arc surface 154 and is located between the two side walls 144. When the headrest frame 2 and the fourth movable link 6 rotate, the transmission part 155 rotates between the two side walls 144, and the two are configured to abut against each other in transmission. That is, when the operating member 14 slides, the transmission part 155 is located at any position between the side walls 144, and the side walls 144 can push the transmission part 155 to move, so that the sliding of the operating member 14 can always be transmitted to the driving member 15.

Claims

1. A mechanism for multidimensional motion, characterized by: The mechanism comprises a base, a first linkage group, a second linkage group, a transmission member and a moving member, two ends of the first linkage group are rotatably connected with the base and the transmission member respectively and form a first four-bar linkage mechanism, two ends of the second linkage group are rotatably connected with the moving member and the transmission member respectively and form a second four-bar linkage mechanism, and the moving mechanism is configured to enable the moving member to move relative to the base in at least two directions.

2. The mechanism of polydimensional movement according to claim 1, characterized in that: The first linkage group comprises a first movable linkage and a second movable linkage, and the second linkage group comprises a third movable linkage and a fourth movable linkage; a lower end of the first movable linkage is rotatably connected with a rear part of the base, an upper end of the first movable linkage is rotatably connected with the transmission member, a lower end of the second movable linkage is rotatably connected with a front part of the base, and an upper end of the second movable linkage is rotatably connected with the transmission member; a front end of the third movable linkage is rotatably connected with the moving member, a rear end of the third movable linkage is rotatably connected with the transmission member, a front end of the fourth movable linkage is rotatably connected with a lower part of the moving member, and a rear end of the fourth movable linkage is rotatably connected with the transmission member.

3. The mechanism of polydimensional movement according to claim 2, characterized in that: The transmission member is provided with four rotation points, and the first, second, third and fourth movable linkages are rotatably connected with the four rotation points respectively.

4. The mechanism of multidimensional movement according to claim 2, characterized in that: The transmission member is provided with three rotation points, the first and third movable linkages are rotatably connected with two of the three rotation points, and the second and fourth movable linkages are rotatably connected with the other rotation point.

5. The mechanism of multidimensional movement according to claim 4, characterized in that: The transmission member is substantially triangular, and the transmission member is provided with an avoiding slot for avoiding the linkages.

6. The mechanism of multidimensional movement according to claim 2, characterized in that: The transmission member is provided with two rotation points, the first and third movable linkages are rotatably connected with one of the two rotation points, and the second and fourth movable linkages are rotatably connected with the other rotation point.

7. The mechanism of multidimensional movement according to claim 2, characterized in that: The first movable linkage has a curved arc that protrudes rearward.

8. The mechanism of multidimensional movement according to claim 7, characterized in that: The base is provided with a mounting slot, and a lower end of the first movable linkage is arranged in the mounting slot, and an end surface of the mounting slot away from the first movable linkage is an arc surface.

9. The mechanism of polydimensional movement according to claim 1, characterized in that: The first linkage group end and the second linkage group end are both provided with a damping sheet.

10. A headrest, characterized by: The mechanism comprises a head support assembly and the mechanism as claimed in any one of claims 1-9, the head support assembly comprises a headrest frame and a headrest support, the headrest frame is rotatably arranged on the headrest support about an axis in a left-right direction; the headrest frame is configured to fit and support a human head and neck, the headrest support is the moving member, and the base is configured to be connected with a seat back of a seat; when the headrest support moves relative to the base, the headrest support drives the headrest frame to move together.

Images