A dynamic lumbar support module and seat

Abstract

This invention discloses a dynamic lumbar support module and a seat. The module consists of a lumbar support that slides longitudinally on an elastic or rigid support, and a sacral support that swings back and forth is hinged to the lower end of the lumbar support. When the dynamic lumbar support module is installed on the seat, the lumbar support can adaptively slide up and down when the back of the seat is tilted back, providing dynamic lumbar support. At the same time, the sacral support can also support the sacrum when the lumbar support is tilted down to its lowest position, thus improving the seat's support for the upper body.

Description

Technical Field

[0001] This invention relates to the field of seating, and particularly to a dynamic lumbar support module and a seat. Background Technology

[0002] To provide better support for the lower back, existing office chairs or ergonomic chairs usually have a protruding lumbar support on the front side of the swivel backrest. Some lumbar supports are fixed structures. The protruding lumbar support is more in line with the physiological curve of the human lower back and can better support the lower back when standing. However, the support of fixed lumbar supports for the upper body still needs to be improved.

[0003] First, because the rotation center of the chair back is not the same as the rotation center of the human waist, there is relative movement between the lumbar support and the back when the chair back is tilted back. The lumbar support not only fails to provide follow-up support for the tilted waist, but also creates a strong "rubbing back" feeling. Some chairs connect the lumbar support to the chair back through a multi-position adjustment structure, so that the position of the lumbar support can be adjusted up and down. However, this structure requires the sitter to manually adjust the position of the lumbar support, making it difficult for the lumbar support to always dynamically conform to the waist when the sitter's back is tilted back.

[0004] Secondly, when a person's back is upright, most of the pressure on their upper body is borne by the thighs and sacrum; the sacrum is the junction of the lower back and buttocks. When a person's back is leaning back, the pressure on their upper body is almost entirely applied to the sacrum. However, most fixed lumbar supports on existing chairs only provide lumbar support and neglect the support for the sacrum. As a result, when leaning back, the sacrum is almost completely unsupported, which can easily lead to health problems such as lumbar strain over time.

[0005] Based on the above technical issues, it is necessary to design a dynamic lumbar support module that is simple in structure, highly practical, and applicable to chairs. While providing dynamic support for the lower back, it can also support the sacrum when the back is tilted back, thereby improving the support and comfort of the upper body. Summary of the Invention

[0006] This invention provides a dynamic lumbar support module and a seat. By attaching a lumbar support that slides longitudinally on an elastic or rigid bracket and a sacral support that swings back and forth at the lower end of the lumbar support, the dynamic lumbar support module can be installed on the seat. This allows the lumbar support to slide adaptively up and down when the back of the seat is tilted back, providing dynamic lumbar support for the tilted lower back. At the same time, the sacral support can also support the sacrum when the lumbar support is tilted down to its lowest position, thus improving the seat's support for the upper body.

[0007] The technical solution of this invention is implemented as follows:

[0008] A dynamic lumbar support module includes an elastic bracket and a lumbar support. The bracket is mounted to a chair seat and can be elastically bent and deformed back and forth. The lumbar support is slidably connected to the bracket along the longitudinal direction. A sacral support member that can swing back and forth is hinged to the lower end of the lumbar support. A linkage assembly is provided between the lumbar support and the bracket. The linkage assembly includes an eccentric linkage member connected to the bracket and rotating along the left and right axis, and a linkage rack correspondingly connected to the lumbar support and extending along the longitudinal direction. The linkage rack has linkage teeth extending along the longitudinal direction. The eccentric linkage member includes a sector-shaped tooth for meshing with the linkage tooth and a pusher portion integrally connected to the sector-shaped tooth. When the lumbar support is subjected to a leaning force and causes the bracket to elastically bend backward, the lumbar support switches from an upright state to an inclined state and slides from a higher position to a lower position relative to the elastic bracket under the action of the leaning force. When the lumbar support is subjected to a leaning force and moves down to the lowest position, the linkage rack meshes with the sector-shaped tooth and causes the eccentric linkage member to swing forward, so that the pusher portion pushes the sacral support member to rotate forward and maintain it in a predetermined position.

[0009] Preferably, the lumbar support also includes an elastic element that acts directly or indirectly on the lumbar support, the elastic element being configured to force the lumbar support to always have a tendency to slide upwards and return to a higher position; when the waist leaves the lumbar support, the lumbar support can rise to its initial position and remain in place.

[0010] Preferably, the elastic element is a tension spring that is directly or indirectly connected between the lumbar support and the bracket.

[0011] Preferably, the bracket and the lumbar support are connected by a sliding connection structure; the sliding connection structure includes a guide portion on one of the bracket and the lumbar support, and a longitudinal guide groove on the other of the bracket and the lumbar support, wherein the guide portion and the longitudinal guide groove are slidably engaged to guide the sliding of the lumbar support.

[0012] Preferably, the guide portion is disposed on the bracket, and the longitudinal guide groove is disposed on the lumbar support; the lumbar support includes a lumbar support seat, and the longitudinal guide groove is disposed in the lumbar support seat from front to back. The guide portion is inserted forward and slidably fitted in the longitudinal guide groove; a limiting member is fixed on the guide portion located on the front side of the lumbar support seat, and the limiting member is configured to restrict the lumbar support seat from moving forward; to prevent the lumbar support from separating from the elastic bracket.

[0013] Preferably, the two ends of the tension spring are connected to the waist support seat and the limiting member, respectively.

[0014] Preferably, one of the brackets and the lumbar support is provided with a receiving groove, and the other bracket and the lumbar support are located in the receiving groove; making the structure of the dynamic lumbar support module more compact.

[0015] Preferably, an elastic reset member is provided between the sacral support and the lumbar support. The elastic reset member forces the sacral support to always have a tendency to rotate backward and reset. In the initial state, when the lumbar support is in a higher position, the elastic reset member forces the sacral support to maintain a vertical support state, thereby increasing the support area of ​​the lumbar support.

[0016] Preferably, in the initial state, when the lumbar support is in a higher position, the linkage tooth is located above the fan-shaped tooth and is spaced apart from the fan-shaped tooth; this is to prevent the sacral support from swinging forward as soon as the lumbar support begins to slide down.

[0017] Preferably, the left and right width of the linkage teeth is greater than the left and right width of the sector teeth to ensure the meshing stability of the linkage teeth and the sector teeth.

[0018] Preferably, the linkage rack also includes a connecting part integrally connected to the upper end of the linkage teeth, the connecting part being rotatably connected to the lumbar support along the front-rear axis; the linkage rack has a working state and a non-working state. When the linkage rack is in the working state, the linkage teeth and the fan-shaped teeth are positioned accordingly; under the action of external force, the connecting part rotates to a predetermined position, causing the linkage teeth and the fan-shaped teeth to be misaligned, at which point the linkage rack switches to the non-working state; the user can choose whether or not they need the linkage support effect of the sacral support component according to their own usage needs, making the dynamic lumbar support module more versatile.

[0019] Preferably, the waist rest is connected to an elastic stop block located on the left and / or right side of the linkage rack; an external force is applied and the linkage rack passes over the elastic stop block, so that the linkage rack switches between the working state and the non-working state.

[0020] Preferably, the elastic blocks are symmetrically arranged on the upper left and right sides of the waist rest; when the linkage rack is in the working state, the two elastic blocks restrict the left and right sway of the linkage rack; when the linkage rack is switched to the non-working state, the linkage rack passes over the elastic block on either side and remains in the predetermined position; while the two elastic blocks stop the linkage rack and keep it in the non-working state, they can also form a stop when the linkage rack is working to prevent it from swaying left and right and ensure the stability of the meshing between the linkage teeth and the fan-shaped teeth.

[0021] A chair includes a seat, a backrest rotatably connected to the seat and capable of rotating back and forth, and a dynamic lumbar support module; the lumbar support is located on the front side of the backrest, and the bracket is fixedly connected to the seat; when the backrest and lumbar support are subjected to a leaning force, the backrest tilts backward and the elastic bracket bends elastically backward, the lumbar support switches from an upright state to an inclined state, and slides from a higher position to a lower position relative to the elastic bracket under the action of the leaning force.

[0022] Preferably, the elastic support includes a lumbar support connecting part extending vertically and a seat connecting part extending laterally from the lower end of the lumbar support connecting part. The lumbar support is slidably connected to the lumbar support connecting part, and the seat connecting part is fixedly connected to the chair seat. The seat connecting part and the lumbar support connecting part form an L-shaped support.

[0023] Preferably, the chair seat includes a seat support portion, and the lower end of the elastic bracket is fixedly connected to the lower end of the seat support portion by screws; this allows the dynamic lumbar support module to be detachably installed on the seat, providing the seat with lumbar support function.

[0024] A dynamic lumbar support module includes a rigid frame and a lumbar support. The rigid frame is linked to a chair back. The lumbar support is slidably connected to the frame along the longitudinal direction. A sacral support member that can swing back and forth is hinged to the lower end of the lumbar support. A linkage assembly is provided between the lumbar support and the frame. The linkage assembly includes an eccentric linkage member connected to the frame and rotating along the left and right axis, and a linkage rack correspondingly connected to the lumbar support and extending along the longitudinal direction. The linkage rack has linkage teeth extending along the longitudinal direction. The eccentric linkage member includes a sector-shaped tooth for meshing with the linkage tooth and a pusher portion integrally connected to the sector-shaped tooth. When the lumbar support is supported by a force and moves down to the lowest position, the linkage rack meshes with the sector-shaped tooth and causes the eccentric linkage member to swing forward, so that the pusher portion pushes the sacral support member to rotate forward and maintain it in a predetermined position.

[0025] A chair includes a seat, a backrest rotatably connected to the seat and capable of rotating back and forth, and a dynamic lumbar support module; the lumbar support is located on the front side of the backrest, and the bracket is linked to the backrest; when the backrest and lumbar support are subjected to a leaning force, the backrest tilts back and the bracket rotates backward, the lumbar support switches from an upright state to an inclined state, and slides from a higher position to a lower position relative to the rigid bracket under the action of the leaning force.

[0026] Preferably, the chair seat includes a seat support and a chassis disposed at the lower end of the seat support. The chassis includes a base and a back connector rotatably connected to the base. The chair back and the rigid bracket are both connected to the back connector so that the rigid bracket and the chair back are linked together.

[0027] The beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0028] 1. This invention features a lumbar support that can slide up and down on an elastic or rigid frame, allowing it to slide from a higher position to an angled position when switching from an upright to a reclining position. This dynamic lumbar support module, when installed on a seat, effectively enhances the lumbar support's support for the lower back. When the backrest and lumbar support are subjected to a backward leaning force, both switch to a reclining position. At this time, the lumbar support slides downward under the force of the lower back, adapting to the movement trajectory of the lower back and providing close support. Furthermore, the sacral support is hinged to the lower end of the lumbar support. When the lumbar support is not sliding down, the support member can increase the lumbar support area. When the sitter leans back and the lumbar support slides down to the lowest position, the linkage rack on the lumbar support can swing forward through the eccentric linkage member linked to the fan-shaped teeth, forcing the sacral support member to rotate forward and support the sacrum position of the sitter. Since the linkage rack meshes with the fan-shaped teeth, the eccentric linkage member under pressure will not rotate backward, but will remain in the corresponding position, so that the sacral support member provides stable support for the sacrum, effectively relieving the sitter's fatigue and improving the user experience of the chair.

[0029] 2. The dynamic lumbar support module in this invention, consisting of a sliding lumbar support and an elastic bracket, is equivalent to a detachable lumbar support module. For office chairs or ergonomic chairs that are not equipped with lumbar support, simply connect the elastic bracket to the seat and position the lumbar support at the front of the backrest that can rotate back and forth to give the office chair or ergonomic chair a dynamic lumbar support function, which has high versatility.

[0030] 3. An elastic element is installed between the lumbar support and the bracket to cause the lumbar support to return to its original position. In addition to the automatic return of the lumbar support, it also further enhances the support effect of the lumbar support on the waist. When the waist leans back and the lumbar support slides down to catch up with the waist, the elastic element deforms. When the waist leans forward slightly, the elastic element releases part of the elastic force and the lumbar support slides up to catch up with the waist. When the waist is completely away from the lumbar support, the elastic element releases all the elastic force and the lumbar support returns to the higher initial position and then stays in place, so that the lumbar support is always close to the waist of the seated person.

[0031] 4. When the lumbar support is in a high position and has not slid down, the linkage teeth and the fan-shaped teeth remain spaced apart, making the dynamic lumbar support module more ergonomic. Specifically, when the lumbar support just begins to slide down, the sacral support will not immediately swing forward to avoid the sacral support swinging forward too early and causing a pressing sensation on the waist. Only when the lumbar support is about to slide to the lowest position will the linkage teeth engage with the fan-shaped teeth to provide support for the sacral position.

[0032] 5. The linkage rack is rotatably connected to the lumbar support along the front-rear axis, allowing the linkage teeth to rotate along the front-rear axis and switch between working and non-working states by means of elastic stops symmetrically arranged on the left and right sides of the lumbar support. This allows the user to selectively rotate the linkage rack according to their own needs. For example, when the user needs the sacral support to rotate forward and support the sacrum, the linkage rack can be kept vertical to facilitate the engagement of the linkage teeth with the fan-shaped teeth. When the user does not need the sacral support to rotate forward and only wants it to remain vertical, the linkage rack can be rotated to disengage the linkage teeth from the fan-shaped teeth. This design better meets the user's needs and expands the functionality of the dynamic lumbar support module. Attached Figure Description

[0033] Figure 1 A schematic diagram showing the external shape of the dynamic lumbar support module installed on the seat;

[0034] Figure 2 A schematic diagram showing how a flexible bracket is securely attached to the chair seat;

[0035] Figure 3 This is an enlarged view of the location of the sliding connection structure;

[0036] Figure 4 An exploded view of the dynamic support module.

[0037] Figure 5 This is a side view of the chair in its initial state, with the backrest upright and the lumbar support in a high position.

[0038] Figure 6 A side view showing the lumbar support sliding down to a lower position when the flexible support bends backward;

[0039] Figure 7 A side sectional view of the location of the sliding connection structure;

[0040] Figure 8 A schematic diagram showing a mesh fabric stretched on the waist support frame that serves as a support base;

[0041] Figure 9 An enlarged view of the sliding connection structure after the cover is separated from the waist support frame;

[0042] Figure 10 This is a simplified schematic diagram of the lumbar support sliding down when the rigid support of the chair back tilts back in Example 2.

[0043] Figure 11 A schematic diagram showing the sacral support hinged to the lower end of the lumbar region;

[0044] Figure 12 A magnified view of the structure where the linkage components are located;

[0045] Figure 13 This is a cross-sectional view showing the rack and pinion positioned above the eccentric linkage in its initial state.

[0046] Figure 14 This is a cross-sectional view showing how the linkage rack meshes with the sector teeth and causes the sacral support to rotate forward when the lumbar support slides down.

[0047] Figure 15 A schematic diagram showing the linkage rack passing over the elastic block without being linked with the sector teeth;

[0048] The reference numerals in the attached drawings are as follows: 1-bracket, 1a-lumbar support connecting part, 1b-seat connecting part, 11-guide part, 2-lumbar support, 2a-accommodating groove, 21-lumbar support support seat, 22-lumbar support plate, 23-longitudinal guide groove, 24-hook, 25-cover, 3-limiting part, 4-elastic part, 5-seat, 6-backrest, 51-base, 52-back connecting part, 7-sacral support part, 8-mounting bracket, 81-eccentric linkage part, 82-fan-shaped toothed part, 9-linkage toothed part, 91-rotating shaft, 92-elastic stop block. Detailed Implementation

[0049] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0050] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0051] This invention has multiple embodiments, the specific implementation methods of which are as follows:

[0052] Example 1: As Figure 1-9 , Figure 11-15 As shown, this embodiment provides a dynamic lumbar support module, which can be applied to office chairs or ergonomic chairs to provide them with dynamic lumbar tracking functionality. The dynamic lumbar support module includes an elastic support 1 and a lumbar support 2. The elastic support 1 can be made of elastic plastic or metal. The support 1 is used to install onto the seat 5 and can be elastically bent and deformed back and forth. The lumbar support 2 is slidably connected to the support 1 longitudinally. When the waist leans back against the lumbar support 2, causing the lumbar support 2 to be subjected to a leaning force and causing the support 1 to bend elastically backward, the lumbar support 2 switches from an upright state to an inclined state. At this time, the vertical component of the leaning force acts downward on the lumbar support 2, causing the lumbar support 2 to slide from a higher position to a lower position relative to the elastic support 1; to adapt to the movement trajectory of the waist when leaning back, thereby forming adaptive support for the waist; in addition, as Figure 11-15As shown, the lower end of the lumbar support 2 is hinged with a sacral support 7 that can swing back and forth, to further enhance the support effect of the dynamic lumbar support module; a linkage component is provided between the lumbar support 2 and the bracket, which can be arranged in the middle of the bracket 1 and the lumbar support 2, or symmetrically arranged between the bracket 1 and the lumbar support 2 as shown in this embodiment; the linkage component includes an eccentric linkage component 81 connected to the bracket and rotating along the left and right axis, and a linkage rack correspondingly connected to the lumbar support 2 and extending longitudinally, wherein a mounting bracket 8 is fixedly connected to the bracket 1, and the eccentric linkage component 81 is connected through... A rotating support shaft extending to the left and right is rotatably connected to the mounting frame 8; the linkage rack has a linkage tooth 9 extending longitudinally, and the linkage tooth 9 has a plurality of meshing teeth arranged sequentially in the longitudinal direction; the eccentric linkage member 81 includes a sector tooth 82 for meshing with the linkage tooth 9 and a pusher portion integrally connected to the sector tooth 82, the middle position of the eccentric linkage member 81 and the hinge position of the eccentric linkage member 81 are staggered from each other, so that when the eccentric linkage member 81 rotates, the pusher portion can swing forward; the sector tooth 82 has a plurality of meshing tooth grooves arranged circumferentially.

[0053] like Figure 14 As shown, when the lumbar support 2 is supported by a force and moves down to the lowest position, the linkage rack meshes with the fan-shaped tooth 82 and causes the eccentric linkage 81 to swing forward, so that the pushing part pushes the sacral support 7 to rotate forward and remain in the predetermined position; after the lumbar support 2 slides down into place, the sacral support can swing forward and support the sacrum of the person sitting, further improving the support effect, and at the same time relieving the pressure of the upper body of the person sitting on the sacrum.

[0054] Furthermore, an elastic reset member is provided between the sacral support 7 and the lumbar support 2. The elastic reset member forces the sacral support 7 to always have a tendency to rotate backward and reset. The elastic reset member can be a tension spring or a compression spring, or it can be a torsion spring located at the rotatable connection position between the sacral support 7 and the lumbar support 2. When the lumbar support 2 slides down to the lowest position and the linkage tooth 9 meshes with the fan-shaped tooth 82 and the linkage sacral support 7 swings forward, the elastic reset member elastically deforms. When the lumbar support 2 resets upward to the initial position, the elastic reset member resets and forces the sacral support 7 to maintain a vertical support state, thereby increasing the support area of ​​the lumbar support 2 and improving the support effect of the lumbar support 2.

[0055] Furthermore, such as Figure 13As shown, in this embodiment, when the lumbar support 2 is in a higher position, the linkage tooth 9 is located above the fan-shaped tooth 82 and is spaced apart from the fan-shaped tooth 82; this is to prevent the sacral support 7 from swinging forward as soon as the lumbar support 2 begins to slide down. Specifically, if the linkage tooth 9 and the fan-shaped tooth 82 are too close or are always in a meshing state, the eccentric linkage 81 can rotate forward and force the sacral support 7 to swing forward as soon as the lumbar support 2 begins to slide down. However, the lumbar support 2 has not yet slid down to its final position, and the sacral support 7 is not aligned with the sacrum of the person sitting. This not only fails to improve the sense of support but also affects the support effect of the lumbar support 2 on the waist due to the premature forward swing of the sacral support 7. By keeping the linkage tooth 9 and the fan-shaped tooth 82 spaced apart in the initial state, the sacral support 7, which is aligned with the sacral position, can swing forward to its final position when the lumbar support 2 slides down to its lowest position, ensuring that the sacral support 7 provides support to the sacrum.

[0056] Furthermore, to ensure the stability of the meshing between the linkage tooth 9 and the sector tooth 82, and to ensure that the linkage tooth 9 and the sector tooth 82 have sufficient meshing area to prevent the "slipping" phenomenon, the left and right width of the linkage tooth 9 is greater than the left and right width of the sector tooth 82; in order to ensure the meshing stability of the linkage tooth 9 and the sector tooth 82.

[0057] Furthermore, based on the different usage needs of different users, the linkage component in this embodiment can selectively link the sacral support 7 to swing forward; making the dynamic lumbar support module more versatile; specifically, such as... Figure 15 As shown, the linkage rack also includes a connecting part integrally connected to the upper end of the linkage tooth 9. The connecting part is rotatably connected to the lumbar support 2 via a rotating shaft 92 extending along the front-rear axis. The linkage rack has a working state and a non-working state. When the linkage rack is in the working state, the linkage tooth 9 and the fan-shaped tooth 82 are positioned to facilitate the forward swing of the sacral support 7 when the lumbar support 2 slides down to the lowest position. When the occupant does not need the sacral support 7 to swing forward, an external force can be applied to rotate the connecting part to a predetermined position, causing the linkage tooth 9 and the fan-shaped tooth 82 to be misaligned. At this time, the linkage rack switches to the non-working state. In this case, the linkage component does not function, and even if the lumbar support 2 moves down to the lowest position, the sacral support 7 remains in a vertical state.

[0058] Furthermore, in order to keep the linkage rack that switches between working and non-working states in the corresponding position, an elastic stop 92 is connected to the waist rest 2. The elastic stop 92 is usually made of elastic rubber or plastic. The elastic stop 92 is located on at least one side of the linkage rack 9, on the left and right sides. When an external force is applied and the linkage rack passes over the corresponding elastic stop 92, the linkage teeth are kept in the position corresponding to the fan-shaped teeth 82 or in the position offset from the fan-shaped teeth 82.

[0059] Furthermore, in this embodiment, the waist support 2 is symmetrically provided with the aforementioned elastic blocks 92 on the left and right sides; that is, the elastic blocks 92 are preferably arranged on the left and right sides of the linkage rack; when the linkage rack is in the working state, the two elastic blocks 92 restrict the left and right sway of the linkage rack, so that the linkage tooth 9 and the fan-shaped tooth 82 are always in corresponding positions; when the linkage rack rotates and switches to the non-working state, the linkage rack passes over the elastic block 92 on either side and remains in the predetermined position; while the two elastic blocks 92 stop the linkage rack and keep it in the non-working state, they can also form a stop when the linkage rack is working, preventing it from swaying left and right, and ensuring the stability of the meshing between the linkage tooth 9 and the fan-shaped tooth 82.

[0060] Furthermore, a seat is provided, including a seat 5, a backrest 6 rotatably connected to the seat 5 and capable of rotating back and forth, and the aforementioned dynamic lumbar support module; the dynamic lumbar support module is located between the backrest 6 and the seat 5; the lumbar support 2 is located on the front side of the backrest 6, and the elastic bracket 1 is fixedly connected to the seat 5; in this embodiment, the seat 5 includes a seat support part and a seat base disposed at the lower end of the seat support part. The seat support part can be composed of a seat plate and a soft cushion, or it can be composed of a seat frame and a mesh fabric; the seat base typically includes a fixed base 51 and a back connector 52 rotatably connected to the base. The elastic bracket 1 can be fixed to the seat support part or to the base 51. In this embodiment, the lower end of the elastic bracket 1 is fixed to the seat support part by screws, providing a fixed fulcrum for the bracket 1 to bend elastically backward, and also allowing the entire dynamic lumbar support module to be detachably installed on the seat, giving the seat a dynamic lumbar support function; Figure 5-6 As shown, when the back and waist of the human body lean back on the chair back 6 and the lumbar support 2 respectively, the elastic support 1 bends backward elastically, causing the lumbar support 2 to switch from an upright state to an inclined state. At this time, the waist tends to slide forward and downward and exert a downward force on the lumbar support 2. The lumbar support 2 can also slide down from a higher position to a lower position, forming a close-fitting support for the waist.

[0061] Furthermore, to facilitate the elastic bending of the flexible support 1 in the front and back, while also taking into account the appearance of the seat, the flexible support 1 in this embodiment is preferably an L-shaped plate structure. Specifically, the flexible support 1 includes a lumbar support connecting part 1a extending vertically and a seat connecting part 1b extending laterally from the lower end of the lumbar support connecting part 1a. The lumbar support connecting part 1a can be a flat plate extending in a straight line, or it can be an inverted Y-shaped plate as shown in this embodiment, with the forked end of the inverted Y-shaped plate extending forward to form the seat connecting part 1b. The lumbar support 2 is slidably connected to the lumbar support connecting part 1a, and the seat connecting part 1b is fixedly connected to the rear position of the seat support part of the chair seat 5. When the lumbar support 2 is subjected to a backward leaning force, the lumbar support connecting part 1a can be elastically bent backward relative to the seat connecting part 1b, and the lumbar support 2 switches to an inclined state.

[0062] Furthermore, the dynamic lumbar support module also includes an elastic element 4 that acts directly or indirectly on the lumbar support 2 to ensure that the lumbar support 2 automatically returns to its original position after sliding down to a lower position. The elastic element 4 is configured to force the lumbar support 2 to always have a tendency to slide upward from a lower position to a higher position. When the waist leaves the lumbar support 2, the lumbar support 2 can rise to its initial position and remain in place. The elastic element 4 can be a compression spring or tension spring that is directly or indirectly connected between the lumbar support 2 and the support 1. In this embodiment, only the structure of the elastic element 4 as a tension spring is shown. When the chair back 6 is tilted back and the elastic support 1 bends backward, the lumbar support 2 slides down and causes the elastic element 4 to deform elastically. When the waist rotates forward to return to its original position, the elastic element 4 releases its elastic force and moves the lumbar support 2 upward, so that the lumbar support 2 still fits the waist. When the waist completely leaves the lumbar support 2, the lumbar support 2 moves upward to the highest position and remains in place.

[0063] Furthermore, the support frame 1 and the lumbar support 2 are connected by a sliding connection structure; such as Figure 3-4 As shown, the sliding connection structure includes a guide portion 11 on one of the bracket 1 and the lumbar support 2, and a longitudinal guide groove 23 on the other of the bracket 1 and the lumbar support 2. The guide portion 11 and the longitudinal guide groove 23 are slidably engaged to guide the sliding of the lumbar support 2. In this embodiment, the guide portions 11 are symmetrically arranged at the front end of the bracket 1, and the longitudinal guide groove 23 is correspondingly arranged on the lumbar support 2. The longitudinal guide groove 23 can be a straight groove extending in the vertical direction as shown in this embodiment, or the longitudinal guide groove 23 can also be a groove extending in the vertical direction. A straight or arc-shaped groove extending downwards; the lumbar support 2 includes a lumbar support seat 21, and the longitudinal guide groove 23 is disposed in the lumbar support seat 21. The guide part 11 is inserted forward and slidably fitted in the longitudinal guide groove 23. A limiting member 3 located in front of the lumbar support seat 21 is fixed on the guide part 11. The limiting member 3 is configured to restrict the forward movement of the lumbar support seat 21. In this embodiment, the two limiting members 3 are connected as one unit to prevent the guide part 11 from separating from the longitudinal guide groove 23, so that the lumbar support 2 can slide stably up and down relative to the bracket 1.

[0064] Furthermore, in this embodiment, the corresponding end of the tension spring can be directly connected to the bracket 1 or the lumbar support 2, or indirectly connected to the bracket 1 or the lumbar support 2. Specifically, in this embodiment, hooks 24 are provided on both the lumbar support 21 and the limiting member 3. One end of the tension spring is directly connected to the hook 24 on the lumbar support 21, and the other end is connected to the hook 24 on the limiting member 3, so that the other end of the tension spring is indirectly connected to the bracket 1. The tension spring usually stretches itself to provide a restoring elastic force to the lumbar support 21.

[0065] Furthermore, to make the dynamic lumbar support module more compact and the seat appearance more harmonious, such as Figure 2As shown, one of the brackets 1 and the lumbar support 2 is provided with a receiving groove 2a, and the other of the brackets 1 and the lumbar support 2 is located in the receiving groove 2a. In this embodiment, only the structure of the receiving groove 2a being provided on the lumbar support seat 21 is shown. The lumbar support connecting part 1a of the bracket 1 is located in the receiving groove 2a, and the longitudinal guide groove 23 is provided in a continuous manner on the inner wall of the receiving groove 2a. The receiving groove 2a can accommodate the lumbar support connecting part 1a, preventing the lumbar support connecting part 1a from protruding out of the lumbar support seat 21 and affecting the appearance of the seat. At the same time, in this embodiment, the lower end of the receiving groove 2a is open, and the left and right width of the receiving groove 2a is approximately matched with the left and right width of the lumbar support connecting part 1a, which can also play a certain guiding role in the up and down sliding of the lumbar support seat 21.

[0066] Furthermore, depending on the different needs of the user, the lumbar support 2 in this embodiment can be a lumbar pillow with a supportive cushion, or it can be a mesh frame structure with a mesh fabric that is relatively breathable. Specifically, such as... Figure 1-7 As shown, the lumbar support seat 21 in this embodiment can be a plate structure, with a lumbar support plate 22 with a supporting soft pad installed at the front end of the plate structure. The lumbar support plate 22 covers the elastic element 4 and the sliding connection structure; or, as shown... Figure 8-9 As shown, the lumbar support seat 21 can also be a frame structure, with a support mesh fabric stretched on the front side of the frame structure; a cover 25 located on the back side of the mesh fabric is provided on the frame structure, which will cover the elastic element 4 and the sliding connection structure to prevent the sliding connection structure and the elastic element 4 from being exposed and affecting the appearance of the seat.

[0067] Example 2: As Figure 10 As shown, the difference between this embodiment and the above embodiments is that in the dynamic lumbar support module of this embodiment, the bracket 1 is rigid, and the rigid bracket 1 is used to link and connect to the backrest 6; the lumbar support 2 is slidably connected to the rigid bracket 1 in the longitudinal direction; the rigid bracket 1 is difficult to bend elastically backward, so in the seat of this embodiment, the rigid bracket 1 is linked and connected to the backrest 6, so that the lumbar support 2 can be changed from an upright state to an inclined state by means of the reclining backrest 6; when the waist leans back on the lumbar support 2 and causes the bracket 1 to bend elastically backward, the lumbar support 2 switches from an upright state to an inclined state. At this time, the vertical component of the leaning force acts on the lumbar support 2, so that the lumbar support 2 slides from a higher position to a lower position relative to the elastic bracket 1; so as to adapt to the movement trajectory of the waist when leaning back, thereby forming adaptive support for the waist and achieving the same waist support effect as in the above embodiments.

[0068] Furthermore, the seat 5 includes a seat support and a chassis located at the lower end of the seat support. The chassis includes a base 51 and a back connector 52 rotatably connected to the base 51. A torsion spring is usually provided between the back connector 52 and the base 51 so that the backrest 6 can tilt backward or rotate forward relative to the seat 5 to return to its original position. The backrest 6 is connected to the back connector 52. In this embodiment, the rigid bracket 1 can be directly connected to the lower part of the backrest 6 or connected to the back connector 52. Both connection structures can enable the bracket 1 and the backrest 6 to be linked together.

[0069] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A dynamic lumbar support module, characterized in that, The chair includes a flexible support (1) and a lumbar support (2). The support (1) is installed on the seat (5) and can be elastically bent and deformed back and forth. The lumbar support (2) is slidably connected to the support (1) in the longitudinal direction. The lower end of the lumbar support (2) is hinged to a sacral support (7) that can swing back and forth. A linkage assembly is provided between the lumbar support (2) and the support. The linkage assembly includes an eccentric linkage member (81) connected to the support and rotating along the left and right axis, and a linkage rack correspondingly connected to the lumbar support (2) and extending in the longitudinal direction. The linkage rack has linkage teeth (9) extending in the longitudinal direction. The eccentric linkage member (81) includes a linkage tooth for connecting with the lumbar support (2). The fan-shaped teeth (82) meshing with the linkage teeth (9), and the push part integrally connected with the fan-shaped teeth (82); when the waist support (2) is subjected to the support force and causes the support (1) to bend backward elastically, the waist support (2) switches from the upright state to the tilted state, and slides from the higher position to the lower position relative to the elastic support (1) under the action of the support force; and when the waist support (2) is subjected to the support force and moves down to the lowest position, at this time the linkage rack meshes with the fan-shaped teeth (82) and causes the eccentric linkage (81) to swing forward, so that the push part pushes the sacral support (7) to rotate forward and remain in the predetermined position.

2. The dynamic waist support module according to claim 1, characterized in that: It also includes an elastic element (4) that acts directly or indirectly on the lumbar support (2), the elastic element (4) being configured to force the lumbar support (2) to always have a tendency to slide upward and reset to a higher position from a lower position.

3. The dynamic waist support module according to claim 2, characterized in that: The elastic element (4) is a tension spring that is directly or indirectly connected between the lumbar support (2) and the bracket (1).

4. The dynamic lumbar support module according to claim 1 or 3, characterized in that: The bracket (1) and the lumbar support (2) are connected by a sliding connection structure. The sliding connection structure includes a guide part (11) on one of the bracket (1) and the lumbar support (2) and a longitudinal guide groove (23) on the other of the bracket (1) and the lumbar support (2). The guide part (11) and the longitudinal guide groove (23) slide together to guide the lumbar support (2) to slide.

5. The dynamic lumbar support module according to claim 4, characterized in that: The guide part (11) is disposed on the elastic bracket (1), and the longitudinal guide groove (23) is disposed on the lumbar support (2); the lumbar support (2) includes a lumbar support seat (21), and the longitudinal guide groove (23) is disposed in the lumbar support seat (21) through the front and rear. The guide part (11) is inserted forward and slidably fitted in the longitudinal guide groove (23); a limiting member (3) located in front of the lumbar support seat (21) is fixed on the guide part (11), and the limiting member (3) is configured to restrict the lumbar support seat (21) from moving forward.

6. The dynamic lumbar support module according to claim 5, characterized in that: The two ends of the tension spring are connected to the waist support seat (21) and the limiting member (3), respectively.

7. The dynamic lumbar support module according to claim 1, characterized in that: One of the brackets (1) and the lumbar support (2) is provided with a receiving groove (2a), and the other of the brackets (1) and the lumbar support (2) is located in the receiving groove (2a).

8. The dynamic lumbar support module according to claim 1, characterized in that: An elastic reset member is provided between the sacral support (7) and the lumbar support (2). The elastic reset member forces the sacral support (7) to always have a tendency to rotate backward and reset. In the initial state, when the lumbar support (2) is in a higher position, the elastic reset member forces the sacral support (7) to maintain a vertical support state.

9. The dynamic lumbar support module according to claim 1, characterized in that: In the initial state, when the waist support (2) is in a high position, the linkage tooth (9) is located above the fan-shaped tooth (82) and is separated from the fan-shaped tooth (82).

10. The dynamic lumbar support module according to claim 1, characterized in that: The left and right width of the linkage tooth (9) is greater than the left and right width of the fan-shaped tooth (82).

11. The dynamic lumbar support module according to claim 1, characterized in that: The linkage rack also includes a connecting part integrally connected to the upper end of the linkage tooth (9), and the connecting part is rotatably connected to the waist support (2) along the front and rear axis; the linkage rack has a working state and a non-working state. When the linkage rack is in the working state, the linkage tooth (9) and the fan-shaped tooth (82) are in the same position; under the action of external force, the connecting part rotates to a predetermined position, so that the linkage tooth (9) and the fan-shaped tooth (82) are misaligned, and at this time the linkage rack switches to the non-working state.

12. The dynamic lumbar support module according to claim 11, characterized in that: The lumbar support (2) is connected to an elastic stop (92) located on the left and / or right side of the linkage rack; an external force is applied and the linkage rack passes over the elastic stop (92), so that the linkage rack switches between working and non-working states.

13. The dynamic lumbar support module according to claim 12, characterized in that: The lumbar support (2) is symmetrically provided with elastic blocks (92) on the left and right sides; when the linkage rack is in the working state, the two elastic blocks (92) restrict the linkage rack from swinging left and right; when the linkage rack is switched to the non-working state, the linkage rack passes over the elastic block (92) on either side and remains in the predetermined position.

14. A type of seat, characterized in that, It includes a seat (5), a backrest (6) rotatably connected to the seat (5) and rotatable back and front, and the dynamic lumbar support module as described in claim 1; the lumbar support (2) is located in front of the backrest (6), and the bracket (1) is fixedly connected to the seat (5); when the backrest (6) and the lumbar support (2) are subjected to a leaning force, the backrest (6) tilts backward and the elastic bracket (1) bends backward elastically, the lumbar support (2) switches from an upright state to an inclined state, and slides from a higher position to a lower position relative to the elastic bracket (1) under the action of the leaning force.

15. The seat according to claim 14, characterized in that: The elastic support (1) includes a lumbar support connecting part (1a) extending vertically and a seat connecting part (1b) extending laterally from the lower end of the lumbar support connecting part (1a). The lumbar support (2) is slidably connected to the lumbar support connecting part (1a), and the seat connecting part (1b) is fixedly connected to the chair seat (5). The seat connecting part (1b) and the lumbar support connecting part (1a) form an L-shaped support (1).

16. The seat according to claim 14, characterized in that: The seat (5) includes a seat support, and the lower end of the elastic bracket (1) is fixedly connected to the lower end of the seat support by screws.

17. A dynamic lumbar support module, characterized in that, The chair includes a rigid support (1) and a lumbar support (2). The rigid support (1) is used to be linked to the backrest (6). The lumbar support (2) is slidably connected to the support (1) in the longitudinal direction. The lower end of the lumbar support (2) is hinged to a sacral support (7) that can swing back and forth. A linkage assembly is provided between the lumbar support (2) and the support. The linkage assembly includes an eccentric linkage member (81) that is connected to the support and rotates along the left and right axis, and a linkage rack that is connected to the lumbar support (2) and extends in the longitudinal direction. The linkage rack has linkage teeth (9) that extend in the longitudinal direction. The eccentric linkage member (81) includes a fan-shaped tooth (82) that meshes with the linkage tooth (9) and a pusher that is integrally connected with the fan-shaped tooth (82). When the lumbar support (2) is subjected to a leaning force and moves down to the lowest position, the linkage rack meshes with the fan-shaped tooth (82) and causes the eccentric linkage member (81) to swing forward, so that the pusher pushes the sacral support (7) to rotate forward and remain in a predetermined position.

18. A type of seat, characterized in that, It includes a seat (5), a backrest (6) rotatably connected to the seat (5) and capable of rotating back and forth, and the dynamic lumbar support module as described in claim 17; the lumbar support (2) is located in front of the backrest (6), and the bracket (1) is linked to the backrest (6); when the backrest (6) and the lumbar support (2) are subjected to a leaning force, the backrest (6) tilts back and the bracket (1) rotates backward, the lumbar support (2) switches from an upright state to an inclined state, and slides from a higher position to a lower position relative to the rigid bracket (1) under the action of the leaning force.

19. The seat according to claim 18, characterized in that: The chair seat (5) includes a seat support and a chassis located at the lower end of the seat support. The chassis includes a base (51) and a back connector (52) rotatably connected to the base (51). The chair back (6) and the rigid bracket (1) are both connected to the back connector (52) so that the rigid bracket (1) and the chair back (6) are linked together.

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