A lumbar support linkage structure

Abstract

The utility model relates to the technical field of seat adjustment, specifically relates to a waist support connecting rod structure, the connecting rod structure includes first swing arm, second swing arm, support base, waist support subassembly and is installed in the support drive mechanism of support base, one end of first swing arm is rotatively connected with support base, one end of second swing arm is rotatively connected with waist support subassembly, the rotatable sliding connection of the other end of first swing arm with waist support subassembly, the other end of second swing arm is rotatively connected with the output of support drive mechanism and is connected with support base slidingly, the utility model discloses the purpose lies in providing a waist support connecting rod structure, and this structure realizes the stability of height and the adjustment experience of smooth through the optimized connecting rod design and drive layout.

Description

Technical Field

[0001] This utility model relates to the field of seat adjustment technology, specifically to a lumbar support linkage structure. Background Technology

[0002] With modern people spending increasingly more time sitting, the comfort of the lower back is crucial, whether at work or driving. The lumbar support design of seats aims to provide effective support for the user's lumbar spine, relieving fatigue and preventing lower back problems.

[0003] Many existing lumbar support adjustment structures employ linkage mechanisms. However, some existing linkage mechanisms are prone to wobbling, tilting, or jamming during heightening or forward / backward adjustment due to uneven force distribution (e.g., the user's back pressure is biased to one side), affecting the smoothness of adjustment and the stability of support. Furthermore, the way the drive mechanism and linkage mechanism work together directly impacts the adjustment accuracy, noise level, and structural durability.

[0004] Therefore, how to design a lumbar support linkage structure that is structurally stable, has smooth transmission, strong support force, is not easy to shake, and has flexible drive is a technical problem that needs to be solved in this field. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a lumbar support linkage structure, which achieves high stability and smooth adjustment experience through optimized linkage design and drive layout.

[0006] This utility model is achieved through the following technical solution: A lumbar support linkage structure includes a first swing arm, a second swing arm, a support base, a lumbar support assembly, and a support drive mechanism mounted on the support base. One end of the first swing arm is rotatably connected to the support base, and one end of the second swing arm is rotatably connected to the lumbar support assembly. The other end of the first swing arm is rotatably slidably connected to the lumbar support assembly, and the other end of the second swing arm is slidably connected to the support base and rotatably connected to the output end of the support drive mechanism.

[0007] The first swing arm and the second swing arm are rotatably connected at their intersection.

[0008] The lumbar support assembly is provided with a first guide groove, the support base is provided with a second guide groove, the other end of the first swing arm is rotatably connected to a first guide post, and the other end of the second swing arm is rotatably connected to a second guide post. The other end of the first swing arm is rotatably slidably connected to the lumbar support assembly through the cooperation of the first guide post and the first guide groove, and the other end of the second swing arm is rotatably slidably connected to the support base through the cooperation of the second guide post and the second guide groove.

[0009] The number of the first swing arm and the second swing arm is two or more, and the two sets of the first swing arm and the second swing arm are symmetrically arranged about the output end of the telescopic drive component. The number of the first guide groove, the second guide groove, and the first guide post corresponds to the number of the first swing arm and the second swing arm.

[0010] The second guide post is rotatably connected between the other ends of the two second swing arms.

[0011] The support drive mechanism is at least one of the following: an electric push rod, a linear motor, or a motor worm gear structure.

[0012] The beneficial effects of this utility model are: This utility model discloses a lumbar support linkage structure. By adopting a scissor linkage layout and cooperating with an electric drive mechanism, it achieves a symmetrical structure that effectively resists off-center loads and torsion. The lumbar support lifts and lowers smoothly and provides firm support without wobbling. Furthermore, the linkage and pin groove structure is mature and reliable, and easy to manufacture and assemble. Attached Figure Description

[0013] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a partial structural schematic diagram of the present invention.

[0016] Figure Labels Support base -- 101, lumbar support assembly -- 102, support drive mechanism -- 103, First swing arm--201, second swing arm--202, first guide groove--203, second guide groove--204, first guide post--205, second guide post--206. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] like Figure 1 and Figure 2 As shown, this embodiment discloses a lumbar support linkage structure, which includes a first swing arm 201, a second swing arm 202, a support base 101, a lumbar support assembly 102, and a support drive mechanism 103 mounted on the support base 101. One end of the first swing arm 201 is rotatably connected to the support base 101, and one end of the second swing arm 202 is rotatably connected to the lumbar support assembly 102. The other end of the first swing arm 201 is rotatably slidably connected to the lumbar support assembly 102, and the other end of the second swing arm 202 is slidably connected to the support base 101 and rotatably connected to the output end of the support drive mechanism 103. The first swing arm 201 and the second swing arm 202 are rotatably connected at their intersection.

[0021] Specifically, this embodiment discloses an X-shaped or scissor-type linkage mechanism. The support base 101 is a fixed base (e.g., fixed to the frame of the seat back), and the lumbar support assembly 102 is a movable platform (for supporting the user's waist); the first swing arm 201 and the second swing arm 202 are pivotally connected at their intersection in the middle, forming an X-shaped or scissor-type linkage structure. This mechanism has two fixed pivot points (the rotation point of the first swing arm 201 on the support base 101) and two movable pivot points (the rotation point of the second swing arm 202 on the lumbar support assembly 102), as well as two sliding pairs (the sliding point of the first swing arm 201 on the lumbar support assembly 102 and the sliding point of the second swing arm 202 on the support base 101).

[0022] Furthermore, the output end of the support drive mechanism 103 (e.g., the end of the electric push rod) pushes the sliding end of the second swing arm 202. When this sliding end translates on the support base 101, the angle between the first swing arm 201 and the second swing arm 202 changes due to the geometric constraints of the linkage structure, thereby forcing the lumbar support assembly 102 to translate relative to the support base 101, thus adjusting the lumbar support position. This linkage structure can effectively convert the linear motion of the support drive mechanism 103 into the linear motion of the lumbar support assembly 102, with reliable structure and stable transmission.

[0023] As a preferred embodiment, the lumbar support assembly 102 is provided with a first guide groove 203, the support base 101 is provided with a second guide groove 204, the other end of the first swing arm 201 is rotatably connected to a first guide post 205, the other end of the second swing arm 202 is rotatably connected to a second guide post 206, the other end of the first swing arm 201 is rotatably slidably connected to the lumbar support assembly 102 through the cooperation of the first guide post 205 and the first guide groove 203, and the other end of the second swing arm 202 is rotatably slidably connected to the support base 101 through the cooperation of the second guide post 206 and the second guide groove 204.

[0024] In this embodiment, a first guide post 205 (e.g., a pin or roller) is mounted at the end of the first swing arm 201 and slides and rotates within a first guide groove 203 on the waist support assembly 102; similarly, a second guide post 206 is mounted at the end of the second swing arm 202 and slides and rotates within a second guide groove 204 on the support base 101. The guide grooves provide a clear movement trajectory for the end of the swing arm, ensuring the smoothness of the linkage structure during expansion and contraction, and preventing derailment or jamming.

[0025] Preferably, the first guide post 205 and the second guide post 206 can be set as rollers, so that rolling friction replaces sliding friction, making the adjustment process smoother, the noise lower, and the driving force requirement smaller.

[0026] As a preferred embodiment, the number of the first swing arm 201 and the second swing arm 202 is two or more, and the two sets of first swing arms 201 and second swing arms 202 are symmetrically arranged about the output end of the telescopic drive assembly; the number of the first guide groove 203, the second guide groove 204, and the first guide post 205 corresponds to the number of the first swing arm 201 and the second swing arm 202.

[0027] A single linkage structure is prone to torsion, swaying, or tilting when subjected to lateral forces or eccentric loads. This solution adopts a symmetrical multi-link design. For example, one (or more) identical scissor linkage mechanisms are set on the left and right sides of the central support drive mechanism 103.

[0028] The symmetrical multiple linkages ensure that the lumbar support assembly 102 is subjected to extremely balanced forces. This layout effectively resists lateral forces or torsional loads from the user's back, ensuring that the lumbar support assembly 102 maintains a stable posture during lifting, lowering, or under load, without tilting or swaying. In addition, the user's back pressure is evenly distributed across multiple linkage mechanisms and multiple guide columns / guide grooves, reducing the stress on individual kinematic pairs, thereby significantly improving the rigidity, durability, and service life of the entire structure. The symmetrical layout ensures that the lumbar support assembly 102 is subjected to uniform forces and moves smoothly during adjustment, avoiding the jamming phenomenon that may occur with single linkages.

[0029] As a preferred embodiment, to ensure the synchronous movement of the aforementioned symmetrical structure, the second guide post 206 is rotatably connected between the other ends of the two second swing arms 202.

[0030] This scheme is a drive synchronization design for the aforementioned symmetrical structure (taking two sets as an example). Here, the second guide post 206 is no longer two independent pins, but a transverse connecting piece (such as a crossbar or an integrated slider). The two ends of this connecting piece are rotatably connected to the sliding ends of the two symmetrical second swing arms 202, respectively. The output end of the support drive mechanism 103 acts on the middle of this shared second guide post 206. By connecting all the drive input ends (sliding ends of the second swing arm 202) together through a rigid connector (second guide post 206), the thrust of the support drive mechanism 103 is applied to the linkage mechanisms on both sides simultaneously and equally, thereby forcing them to move synchronously, thus completely solving the tilting or jamming problem that may be caused by asynchronous movement of multiple sets of linkages.

[0031] As a preferred embodiment, the support drive mechanism 103 is at least one of an electric push rod, a linear motor, or a motor worm gear structure.

[0032] All of the above drive structures are electrically driven, and users can easily adjust them via buttons, resulting in a high degree of automation and a good user experience.

[0033] The worm gear structure of the motor, especially when used with a small lead screw, typically has a good reverse self-locking function. This means that when the lumbar support assembly 102 is adjusted to the correct position and the power is off, even if the user applies pressure to their back, the lumbar support can remain stably in place without automatically retracting or sliding down, improving the safety and reliability of the support while also saving energy.

[0034] In summary, the lumbar support linkage structure of this embodiment has the following technical advantages: High stability: The symmetrical structure effectively resists off-center loading and torsion, and the lumbar support lifts and lowers smoothly, providing firm support without wobbling.

[0035] Smooth and synchronized movement: The shared guide column (slider) ensures that the connecting rods on both sides move synchronously, and the adjustment process is smooth and without jamming.

[0036] Reliable drive: It adopts electric drive and is easy to adjust; in particular, when using worm gear structure, reliable self-locking can be achieved.

[0037] Simple structure and controllable cost: The connecting rod and pin groove structure is mature and reliable, and easy to manufacture and assemble.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A lumbar support linkage structure, characterized in that, It includes a first swing arm, a second swing arm, a support base, a lumbar support assembly, and a support drive mechanism mounted on the support base. One end of the first swing arm is rotatably connected to the support base, and one end of the second swing arm is rotatably connected to the lumbar support assembly. The other end of the first swing arm is rotatably slidably connected to the lumbar support assembly, and the other end of the second swing arm is slidably connected to the support base and rotatably connected to the output end of the support drive mechanism.

2. The lumbar support linkage structure according to claim 1, characterized in that, The first swing arm and the second swing arm are rotatably connected at their intersection.

3. The lumbar support linkage structure according to claim 1, characterized in that, The lumbar support assembly is provided with a first guide groove, the support base is provided with a second guide groove, the other end of the first swing arm is rotatably connected to a first guide post, and the other end of the second swing arm is rotatably connected to a second guide post. The other end of the first swing arm is rotatably slidably connected to the lumbar support assembly through the cooperation of the first guide post and the first guide groove, and the other end of the second swing arm is rotatably slidably connected to the support base through the cooperation of the second guide post and the second guide groove.

4. The lumbar support linkage structure according to claim 3, characterized in that, The number of the first swing arm and the second swing arm is two or more, and the two sets of the first swing arm and the second swing arm are symmetrically arranged about the output end of the telescopic drive component. The number of the first guide groove, the second guide groove, and the first guide post corresponds to the number of the first swing arm and the second swing arm.

5. The lumbar support linkage structure according to claim 4, characterized in that, The second guide post is rotatably connected between the other ends of the two second swing arms.

6. The lumbar support linkage structure according to claim 1, characterized in that, The support drive mechanism is at least one of the following: an electric push rod, a linear motor, or a motor worm gear structure.

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