Seat lumbar support

Abstract

It provides seat lumbar support. [Solution] The present invention discloses a seat lumbar support that includes a backrest, a base and a receiving plate located in front of the base, a pressing arm provided between the base and the receiving plate, the pressing arm positioned vertically between the base and the receiving plate, the upper end of the pressing arm rotatably connected to the base and the lower end abutting against the rear of the receiving plate, a second drive mechanism attached to the base, the second drive mechanism used to drive the pressing arm to rotate around its center of rotation, the pressing arm rotating, its lower end pushing the receiving plate and moving it forward of the base. By controlling the rotation angle of the pressing arm, a front-to-back adjustment function of the lumbar support can be realized, and by adopting a vertical arrangement for the pressing arm, the compactness of the overall structure of the backrest is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of car seats, and specifically to seat lumbar supports.

Background Art

[0002] A car seat is an important component that supports passengers in the vehicle and protects their safety. In the increasingly competitive automobile market, the comfort of the seat has become an important indicator for evaluating the quality of the entire vehicle seat and the entire vehicle.

[0003] In addition, the lumbar support of the seat backrest is an important component in the car seat that supports the waist. It can assist in supporting the passenger's waist and back, and relieve situations such as low back pain, back pain, and fatigue of the passenger caused by long - term driving or riding.

[0004] However, in the prior art, the structure of the lumbar support inside the backrest is complex. Especially, the lumbar support that can be adjusted in four directions of front - rear, up - down has a large thickness size and occupies a large amount of the front - rear space inside the backrest frame, resulting in the enlargement of the seat. Therefore, optimization and improvement in terms of compactness are urgently needed.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, the present invention provides a seat lumbar support that can support the user's waist and has the advantage of high compactness.

Means for Solving the Problems

[0006] To achieve the above object, the technical solution of the present invention is as follows.

[0007] A seat lumbar support, including a backrest, wherein a base and a receiving plate located in front of the base are attached within the backrest, a pressing arm is provided between the base and the receiving plate, and the pressing arm is positioned between the base and the receiving plate so as to be aligned vertically. The seat lumbar support is characterized in that the pressing arm has its upper end rotatably connected to a base and its lower end abutting against the rear side of a receiving plate, a second drive mechanism is attached to the base, the second drive mechanism is used to drive the pressing arm to rotate around its center of rotation, and the pressing arm rotates, causing its lower end to push the receiving plate and move it forward of the base.

[0008] With the above structure, when the second drive mechanism drives the pressing arm to rotate away from the base, its lower end pushes the receiving plate, causing it to move forward of the base. As a result, the receiving plate comes into contact with the user's lumbar region as it moves forward, providing auxiliary support to the rider's waist.

[0009] Preferably, the receiving plate is a flexible plastic plate, and its upper end is fixedly connected to the base.

[0010] Preferably, the base includes a mounting base plate assembled inside the backrest and a support plate slidably connected to the mounting base plate, the support plate being mounted to slide along the height direction of the mounting base plate, the support plate being provided with the pressing arm, a second drive mechanism, and a receiving plate, the mounting base plate being provided with a third drive mechanism, the third drive mechanism being used to drive the support plate to slide along the height direction of the mounting base plate.

[0011] Preferably, the third drive mechanism includes a linear drive unit provided at one end of the mounting base plate in the width direction and a guide assembly provided at the other end, wherein the linear drive unit is used to drive the support plate to move up and down, and the guide assembly is used to guide and support the up and down movement of the support plate.

[0012] Preferably, the second drive mechanism includes a slider slidably mounted on the base and a thrust receiving assembly that controls the sliding of the slider, wherein the pressing arm and the slider are connected by a connecting rod, the ends of which are articulated to the pressing arm and the slider, respectively, so that the slider slides and moves and rotates the pressing arm via the connecting rod.

[0013] Preferably, the thrust receiving assembly includes a regulating block that abuts against the slider and a drive member that drives the regulating block to move along the sliding direction of the slider, wherein an elastic member is provided between the base and the slider, and a force is applied to the elastic member that causes the slider to abut against the regulating block, and when the pressing arm is subjected to external pressure, the slider can move the pressing arm toward the base by sliding over the resistance of the elastic member.

[0014] Preferably, the elastic member is a compression spring, which abuts between the slider and the end of the base, and the regulating block moves toward the compression spring, forcing force to be stored in the compression spring via the slider, and the regulating block moves toward the slider, releasing the elastic potential energy of the compression spring, and the thrust generated in the compression spring can move the slider in sync with the regulating block.

[0015] Preferably, a guide rod extending along its height is fixedly installed on the base, and the compression spring, slider, and regulating block are fitted sequentially to the guide rod along its height, and the slider and regulating block are slidable up and down relative to the guide rod.

[0016] Preferably, the base is provided with a rotating shaft and a first drive mechanism for rotating the rotating shaft, two sets of pressing arms are connected to the rotating shaft, a support is attached to the end of each of the two sets of pressing arms that is away from the rotating shaft, two annular grooves are provided symmetrically on the rotating shaft, the upper ends of the pressing arms are rotatably fitted into the corresponding annular grooves, the side walls on both sides of each annular groove are inclined with respect to the centerline of the rotating shaft, and both sides of the end of each pressing arm closer to the rotating shaft are slidably in contact with the side walls on both sides of the corresponding annular groove. When the receiving plate is in its lowest position, the first drive mechanism rotates the rotating shaft, and the transmission of the inclined side walls of the annular groove and the restrictive action of the connecting rod force the pressing arm to swing back and forth along the axial direction of the rotating shaft. An opening is provided in the center of the receiving plate, and the width of the opening is suitable for the minimum distance between the support parts of the two pressing arms.

[0017] Preferably, the rotating shaft includes a central shaft and a sleeve fixedly fitted onto the central shaft, the sleeve having an annular groove, and one end of the pressing arm having an annular sleeve hole that fits into the annular groove, the annular sleeve hole being rotatably fitted into the annular groove. [Effects of the Invention]

[0018] Compared to conventional technology, the beneficial effects of the present invention are as follows:

[0019] 1. When the seat lumbar support provided by the present invention is adopted, by controlling the rotation angle of the pressing arm, the front-back adjustment function of the lumbar support can be realized. Also, by adopting a vertical arrangement for the pressing arm, the space inside the backrest is not overly occupied, ensuring the compactness of the overall structure of the backrest.

[0020] 2. When the seat lumbar support provided by the present invention is adopted, not only can the adjustment function in the four directions of front-back, up-down of the lumbar support be realized, but at the same time, it also has the massage functions of kneading at a fixed point and traveling kneading. As a result, the multi-functionality of the seat is realized, improving the user's riding experience and comfort.

[0021] 3. When the seat lumbar support provided by the present invention is adopted, in the state of using the lumbar support or the massage function, if a collision or other sudden situation occurs to the vehicle, the recoverable crushability of the pressing arm and the support part is realized, ensuring the safety of using the massage and lumbar support.

Brief Description of the Drawings

[0022] [Figure 1] It is a schematic diagram of the structure of the seat lumbar support. [Figure 2] It is a schematic diagram of the structure of the seat lumbar support in the unused state (hiding the backrest A). [Figure 3] It is a cross-sectional view of the seat lumbar support in the used state. [Figure 4] It is a front view showing the internal structure of the seat lumbar support. [Figure 5] It is a schematic diagram of the structure of the seat lumbar support in the used state. [Figure 6] It is a schematic diagram of the structure of the rotating shaft B1. [Figure 7] It is an exploded view of the sleeve B13 and the pressing arm B2. [Figure 8] It is a partial cross-sectional view of the rotating shaft B1. [Figure 9]This is a cross-sectional view of the seat lumbar support in an unused state. [Figure 10] This is a cross-sectional view of the seat lumbar support in its usage state. [Figure 11] This is a schematic diagram showing the positional relationship between slider D4 and the thrust receiving assembly. [Figure 12] Another schematic diagram of the seat lumbar support structure (hiding backrest A and support plate B5). [Figure 13] This is a schematic diagram of the structure of support plate 2. [Modes for carrying out the invention]

[0023] The present invention will be further described below with reference to embodiments and drawings.

[0024] As shown in Figures 1-3, the seat lumbar support includes a backrest A, to which a base B and a receiving plate B5 located in front of the base B are attached. When in use, the receiving plate B5 corresponds to the position of the user's waist. A pressing arm B2 is provided between the base B and the receiving plate B5, and the pressing arm B2 is positioned between the base B and the receiving plate B5 along the vertical direction. Specifically, the upper end of the pressing arm B2 is rotatably connected to the base B, and the lower end abuts against the rear side of the receiving plate B5. As can be seen in Figure 4, a second drive mechanism D is attached to the base B. The second drive mechanism D can drive the pressing arm B2 to rotate around its center of rotation. That is, the pressing arm B2 can be driven to rotate in a direction toward the base B or away from the base B. When the pressing arm B2 rotates away from the base B, its lower end pushes the receiving plate B5, causing it to move forward of the base B. As a result, the receiving plate B5 contacts the user's lumbar region, providing auxiliary support to the occupant's lower back. The advantages of this design are that the rotation angle of the pressing arm B2 can be controlled to achieve fore-aft adjustment of the lumbar support, and the vertical orientation of the pressing arm B2 does not occupy excessive space inside the backrest A, thus ensuring the overall compactness of the backrest A structure.

[0025] Furthermore, as shown in Figure 3, in this embodiment, the receiving plate B5 is a flexible plastic plate, and its upper end is fixedly connected to the base B. When the pressing arm B2 applies forward thrust to the receiving plate B5, the receiving plate B5 is encouraged to deform and support the user's waist, and when the pressing arm B2 moves toward the base B, the receiving plate B5 can return to its original state.

[0026] Referring to Figures 2 and 4, the base B includes a mounting base plate 1 assembled inside the backrest A and a support plate 2 slidably connected to the mounting base plate 1. The support plate 2 slides along the height direction of the mounting base plate 1. The support plate 2 is provided with a pressing arm B2 and a second drive mechanism D, and the upper end of a receiving plate B5 is fixedly connected to the support plate 2. The mounting base plate 1 is provided with a third drive mechanism E. The third drive mechanism E can drive the support plate 2 to slide along the height direction of the mounting base plate 1. That is, the receiving plate B5 can be moved up and down along the user's waist and back, thereby realizing an up and down adjustment function for the lumbar support. Furthermore, by combining this with the front and back adjustment function realized by the pressing arm B2, the lumbar support has adjustment functions in four directions: front, back, up and down, thereby meeting the individual adjustment needs of users with different body types.

[0027] Referring again to Figure 4, the third drive mechanism E includes a linear drive unit E1 provided at one end of the mounting base plate 1 in the width direction and a guide assembly E2 provided at the other end. The linear drive unit E1 can drive the support plate 2 to move up and down, and the guide assembly E2 guides and supports the up and down movement of the support plate 2, making the up and down movement of the support plate 2 on the mounting base plate 1 more stable. This design, by arranging the pressing arm B2 and the second drive mechanism D in the center of the support plate 2 and providing the linear drive unit E1 and guide assembly E2 at both ends, has the advantages of high structural reliability, compactness, and small space occupancy, and contributes to the thin design of the product.

[0028] Furthermore, as shown in Figure 4, the linear drive unit E1 includes a first threaded rod E11 extending along the height direction of the mounting base plate 1, a nut sleeve E12 fitted to the first threaded rod E11, and a first motor E13 that rotationally drives the nut sleeve E12, with the first threaded rod E11 located at the left end of the mounting base plate 1. As can be seen from Figure 12, both ends of the first threaded rod E11 are fixedly supported on the mounting base plate 1 via a support base E3. The first motor E13 is fixedly attached to the support plate 2. By rotationally driving the nut sleeve E12, the first motor E13 can move the nut sleeve E12, causing it to spirally move up and down along the axial direction of the first threaded rod E11, and as a result, the entire first motor E13 and support plate 2 can be moved up and down. Because the first threaded rod E11 is positioned unevenly, causing vibrations and gaps in the support plate 2, it is combined with the guide assembly E2 at the right end to absorb vibrations and gaps in the support plate 2 and ensure the stability of its vertical movement. Furthermore, by permanently attaching the first threaded rod E11, the support plate 2 can be supported more stably.

[0029] As shown in Figure 5, the guide assembly E2 includes a guide rail E21 fixedly installed at the right end of the mounting base plate 1, the guide rail E21 extending along the height direction of the mounting base plate 1. Referring to Figure 13, a second roller E22 is provided at the bottom of the support plate 2 at a position corresponding to the guide rail E21, and the second roller E22 is in slidable contact with the bottom of the guide rail E21. Such a design improves the stability of the sliding of the support plate 2 and also has the advantage of low cost. In this embodiment, a plurality of sets of third rollers 21 are rotatably provided at the bottom of the support plate 2, which are in slidable contact with the mounting base plate 1, and the third rollers 21 can further enhance the smoothness of the sliding of the support plate 2.

[0030] Referring to Figure 3, the second drive mechanism D includes a slider D4 slidably mounted on the base B and a thrust receiving assembly that controls the sliding of the slider D4. The pressing arm B2 and the slider D4 are connected by a connecting rod D5, the ends of which are articulated to the pressing arm B2 and the slider D4, respectively. The slider D4 slides, moving the pressing arm B2 via the connecting rod D5 and causing it to rotate around its center of rotation. The thrust receiving assembly drives the slider D4 to slide upward, causing the pressing arm B2 to rotate synchronously outward via the connecting rod D5. The thrust receiving assembly drives the slider D4 to slide downward, moving the pressing arm B2 through the interlocking action of the connecting rod D5 and causing it to rotate synchronously inward, thereby allowing the pressing arm B2 to be retrieved toward the support plate 2.

[0031] Referring again to Figures 9 and 10, the thrust receiving assembly includes a regulating block D2 that abuts against the slider D4, and a drive member D3 that drives the regulating block D2 to move along the sliding direction of the slider D4. An elastic member D1 is provided between the support plate 2 and the slider D4, and this elastic member D1 applies a force that causes the slider D4 to abut against the regulating block D2. When the pressing arm B2 is subjected to external pressure, the slider D4 can rotate the pressing arm B2 toward the support plate 2 by sliding over the resistance of the elastic member D1. When the user uses the forward and backward adjustment function of the lumbar support, the drive member D3 drives the regulating block D2 to move toward the slider D4. In this process, the elastic member D1 applies a force that keeps the slider D4 in contact with the regulating block D2, so that the slider D4 can move synchronously with the regulating block D2. As a result, the interlocking action of the connecting rod D5 moves the pressing arm B2 and rotates it outward around its center of rotation, thereby causing the lower end of the pressing arm B2 to protrude the receiving plate B5 forward. When the drive member D3 drives the regulating block D2 to move toward the slider D4, the regulating block D2 pushes the slider D4, causing the slider D4 to slide over the resistance of the elastic member D1. As a result, the interlocking action of the connecting rod D5 moves the pressing arm B2 and rotates it inward, allowing the receiving plate B5 to return to its original position.

[0032] In this structural design, the lumbar support also possesses a passive crushable function during use. Specifically, in the process where the pressing arm B2 is in a position where the receiving plate B5 is projecting forward, if a collision with a vehicle or other sudden situation occurs and the pressing arm B2 is subjected to external force, the slider D4 overcomes the resistance of the elastic member D1 and slides, and through the interlocking action of the connecting rod D5, the pressing arm B2 can be moved and quickly retrieved toward the support plate 2, and at the same time, the receiving plate B5 returns to its original flat state. This effectively prevents the lumbar support from causing harm to the human body and improves the safety of using the lumbar support. When the external force disappears, the elastic member D1 returns to its original position, pushing and sliding the slider D4, and consequently moving the pressing arm B2 to automatically return to the working position. Such a design has the advantages of protecting the receiving plate B5 and pressing arm B2 from damage, reducing costs, saving the effort of replacing parts, and being highly practical.

[0033] The elastic member D1 may be a compression spring, tension spring, torsion spring, leaf spring, elastic piece, etc. In this embodiment, the elastic member D1 is a compression spring. Referring to Figures 9 and 10, the compression spring is in contact with the slider D4 and the lower end of the support plate 2. The regulating block D2 moves downward along the height direction of the support plate 2, that is, moves toward the compression spring, and pushes the slider D4, compressing the compression spring downward, thereby forcibly accumulating force in the compression spring. The slider D4 moves downward, and via the connecting rod D5, the pressing arm B2 is moved and rotated toward the support plate 2. When the regulating block D2 moves toward the direction away from the slider D4, that is, moves upward, the elastic potential energy of the compression spring can be released, and the thrust generated in the compression spring can move the slider D4 in sync with the regulating block D2. As a result, the pressing arm B2 is moved via the connecting rod D5 and rotated toward the outside.

[0034] Furthermore, as shown in Figure 9, a guide rod D6 extending along its height is fixedly installed on the support plate 2. A compression spring, a slider D4, and a regulating block D2 are fitted onto the guide rod D6 in order from bottom to top, and the slider D4 and regulating block D2 are slidable up and down relative to the guide rod D6. This design ensures the reliability of the mounting and movement of the elastic member D1, slider D4, and regulating block D2.

[0035] As shown in Figures 4 and 5, a rotating shaft B1 and a first drive mechanism C that rotates the rotating shaft B1 are rotatably mounted on the support plate 2. Two sets of pressing arms B2 are connected to the rotating shaft B1, and a support part B3 is attached to one end of each of the two sets of pressing arms B2 that is away from the rotating shaft B1. Referring to Figures 6 and 8, two sets of annular grooves B11 are symmetrically provided on the rotating shaft B1, and the upper ends of the two sets of pressing arms B2 are rotatably fitted into the two annular grooves B11, respectively. As can be seen from Figure 8, the side walls on both sides of each annular groove B11 are all provided so as to be inclined with respect to the center line of the rotating shaft B1, that is, an angle r is formed between the center line of the annular groove B11 and the center line of the rotating shaft B1, and both sides of the end of the pressing arm B2 closer to the rotating shaft B1 are slidably in contact with the side walls on both sides of the annular groove B11. When the receiving plate B5 is in its initial lowest position, the first drive mechanism C rotates the rotating shaft B1, and the transmission of the inclined side wall of the annular groove B11 and the restrictive action of the connecting rod D5 force the pressing arm B2 to swing back and forth along the axial direction of the rotating shaft B1, thereby moving the two support parts B3 closer together or further apart. In this embodiment, one end of the connecting rod D5 is articulated to the center of the pressing arm B2, and the connecting rod D5 and the pressing arm B2 are connected by a ball joint. Referring to Figure 2, an opening B51 is provided in the center of the receiving plate B5, and the width of the opening B51 matches the minimum distance between the support parts B3 of the two pressing arms B2.

[0036] The advantage of this design is that the device not only provides lumbar support but also massages the user's back. Specifically, when using the lumbar support, the first drive mechanism C first rotates the rotating shaft B1 and transmits power to the pressing arm B2. Due to the constraint action of the connecting rod D5, a slanted cam transmission is formed between the inclined side wall of the annular groove B11 and the side wall of the pressing arm B2. As a result, the rotation of the rotating shaft B1 forces the pressing arm B2 to swing back and forth along the axial direction of the rotating shaft B1, that is, the pressing arm B2 swings from side to side, which moves the support part B3 and causes it to swing from side to side. Since the two annular grooves B11 are provided symmetrically, the swing trajectories of the two support parts B3 are also symmetrical, that is, the two support parts B3 can move closer to and further apart from each other. After widening the gap between the two support parts B3, the second drive mechanism D moves the two support parts B3 by driving two sets of pressing arms B2 to rotate outward, causing the two support parts B3 to push the receiving plate B5 and make it protrude forward. The two symmetrically positioned support parts B3 push and deform the receiving plate B5, forming a lumbar support, so that the two support parts B3 can support both the left and right ends of the user's waist. The central part of the receiving plate B5 can form an inwardly recessed structure due to the pressure from the user's waist, thereby improving the comfort of the lumbar support.

[0037] When using the massage function, the first drive mechanism C rotates the rotation axis B1 by a certain angle to adjust the distance between the two support parts B3 to the minimum. The second drive mechanism D drives two sets of pressing arms B2 to rotate outward, moving the two support parts B3 forward and through the opening B51. Then, the first drive mechanism C rotates the rotation axis B1, transmitting power to the pressing arms B2, allowing the two support parts B3 to perform a reciprocating kneading massage on the user's waist and back. Furthermore, the third drive mechanism E drives the support plate 2 to slide along the height direction of the mounting base plate 1, moving the two support parts B3 up and down along the meridians on both sides of the user's spine. As a result, a mobile kneading massage function is simulated, enhancing the massage effect and improving the functionality of the seat. After the massage is complete, the first drive mechanism C rotates the rotation axis B1 by a certain angle to adjust the distance between the two support parts B3 to the minimum position, and the second drive mechanism D drives the pressing arm B2 to rotate inward, so that the two support parts B3 are returned to the support plate 2 through the opening B51.

[0038] As shown in Figures 4 and 6, the rotating shaft B1 includes a central shaft B12 and a sleeve B13 fixedly fitted onto the central shaft B12. An annular groove B11 is provided in the sleeve B13, and this annular groove B11 has two inner walls a arranged on the left and right sides. The centerlines of the two inner walls a are both positioned to be inclined with respect to the centerline of the rotating shaft B1. Referring further to Figure 7, one end of the pressing arm B2 has an annular sleeve hole B21 that fits into the annular groove B11, and the annular sleeve hole B21 is rotatably fitted into the annular groove B11. Specifically, both the left and right sides of this annular sleeve hole B21 have outer walls b, and the two outer walls b are each combined with two inner walls a, and the two outer walls b are each in slidable contact with the two inner walls a. The first drive mechanism C can directly rotate the central shaft B12, moving the sleeve B13 and causing it to rotate. As the sleeve B13 rotates continuously, the two inner walls a of the annular groove B11 rotate, forcing the annular sleeve hole B21 to oscillate back and forth along the axial direction of the central axis B12. As a result, the support portion B3 at the tip of the pressing arm B2 can be moved and oscillated from side to side.

[0039] Referring to Figure 7, in order to facilitate the assembly of the annular sleeve hole B21, a circular projection c is detachably attached to one end of the sleeve B13, and an annular boss d projecting outward is provided on the surface of the sleeve B13 near the circular projection c. The space enclosed by the inner wall of the circular projection c and the inner wall of the annular boss d and the circumferential surface of the sleeve B13 constitutes the annular groove B11.

[0040] Referring to Figures 5 and 11, two sets of guide rods D6 are provided, and the two sets of guide rods D6 are arranged symmetrically along the width direction of the support plate 2. One set of guide rods D6 corresponds to one set of pressing arms B2, and two sets of associated compression springs and connecting rods D5 are also provided. The two sets of compression springs are each fitted onto two guide rods D6. Both ends of the regulating block D2 and both ends of the slider D4 are slidably connected to two guide rods D6. The two connecting rods D5 are provided symmetrically on the sides of the two sets of pressing arms B2.

[0041] Referring again to Figure 11, the drive member D3 includes a second motor D31 fixed to the support plate 2 and a second threaded rod D32 rotationally driven by the second motor D31. This second threaded rod D32 extends along the height direction of the support plate 2. The regulating block D2 is screw-fitted to the second threaded rod D32. When the second motor D31 rotationally drives the second threaded rod D32, the regulating block D2 can be moved along the second threaded rod D32. To ensure the compactness of the overall structure and the uniformity of the force acting on the slider D4, the second threaded rod D32 is positioned between two sets of guide rods D6, and both ends of the regulating block D2 and both ends of the slider D4 are slidably connected to the two guide rods D6, respectively. The second motor D31 drives the regulating block D2 downward, moving the slider D4 to compress the two sets of compression springs simultaneously, thereby retracting the two sets of pressing arms B2 inward and ensuring the synchronization of their movement.

[0042] As can be seen in Figure 11, a mounting base D7 is fixedly installed at the lower end of the support plate 2, the ends of the two guide rods D6 are both fixedly connected to the widthwise ends of the mounting base D7, and the lower end of the second threaded rod D32 is rotatably supported in the center of the mounting base D7. These considerations ensure the reliability of the mounting.

[0043] Finally, it should be noted that the above description represents only preferred embodiments of the present invention, and those skilled in the art can, under the teachings of the present invention, make various similar expressions without departing from the spirit and claims of the invention, but all such modifications are within the scope of protection of the present invention. [Explanation of Symbols]

[0044] A Backrest B Bass B1 Rotation axis B2 Pressing Arm B3 Support part B5 receiving plate B11 Annular Groove B12 Center axis B13 Sleeve B21 Annular sleeve hole B51 opening C First drive mechanism D Second drive mechanism D1 Elastic member D2 regulatory block D3 Drive Member D4 Slider D5 connecting rod D6 Guide Rod D7 Mounting Base D31 Second motor D32 Second threaded rod E Third drive mechanism E1 Linear Drive Unit E2 Guide Assembly E3 Support Base E11 First threaded rod E12 Nut Sleeve E13 First motor E21 Guide Rail E22 The Second Laura 1. Mounting base plate 2 Support plate 21 The Third Laura a. Inner wall b Outside wall c. Circular protrusion d Ring Boss r angle

Claims

1. A seat lumbar support, comprising a backrest (A), the backrest (A) having a base (B) and a receiving plate (B5) located in front of the base (B), a pressing arm (B2) provided between the base (B) and the receiving plate (B5), the pressing arm (B2) positioned between the base (B) and the receiving plate (B5) along the vertical direction, The seat lumbar support is characterized in that the pressing arm (B2) has its upper end rotatably connected to a base (B) and its lower end abuts against the rear side of a receiving plate (B5), a second drive mechanism (D) is attached to the base (B), the second drive mechanism (D) is used to drive the pressing arm (B2) to rotate around its center of rotation, and the pressing arm (B2) rotates, its lower end pushes the receiving plate (B5) and moves it forward of the base (B).

2. The seat lumbar support according to claim 1, characterized in that the receiving plate (B5) is a flexible plastic plate and its upper end is fixedly connected to the base (B).

3. The seat lumbar support according to claim 1, characterized in that the base (B) includes a mounting base plate (1) assembled inside the backrest (A) and a support plate (2) slidably connected to the mounting base plate (1), the support plate (2) is mounted so as to slide along the height direction of the mounting base plate (1), the support plate (2) is provided with the pressing arm (B2), a second drive mechanism (D), and a receiving plate (B5), the mounting base plate (1) is provided with a third drive mechanism (E), and the third drive mechanism (E) is used to drive the support plate (2) to slide along the height direction of the mounting base plate (1).

4. The seat lumbar support according to claim 3, wherein the third drive mechanism (E) includes a linear drive unit (E1) provided at one end in the width direction of the mounting base plate (1) and a guide assembly (E2) provided at the other end, the linear drive unit (E1) is used to drive the support plate (2) to move up and down, and the guide assembly (E2) is used to guide and support the up and down movement of the support plate (2).

5. The seat lumbar support according to claim 1, wherein the second drive mechanism (D) includes a slider (D4) slidably mounted on the base (B) and a thrust receiving assembly that controls the sliding of the slider (D4), and the pressing arm (B2) and the slider (D4) are connected by a connecting rod (D5), and both ends of the connecting rod (D5) are articulated to the pressing arm (B2) and the slider (D4), respectively, so that the slider (D4) slides and moves and rotates the pressing arm (B2) via the connecting rod (D5).

6. The seat lumbar support according to claim 5, wherein the thrust receiving assembly includes a regulating block (D2) that abuts against the slider (D4) and a driving member (D3) that drives the regulating block (D2) to move along the sliding direction of the slider (D4), an elastic member (D1) is provided between the base (B) and the slider (D4), and a force is applied to the elastic member (D1) that causes the slider (D4) to abut against the regulating block (D2), and when the pressing arm (B2) is subjected to external pressure, the slider (D4) slides over the resistance of the elastic member (D1), thereby moving the pressing arm (B2) toward the base (B).

7. The seat lumbar support according to claim 6, characterized in that the elastic member (D1) is a compression spring, the compression spring abuts between the slider (D4) and the end of the base (B), the regulating block (D2) moves toward the compression spring, forcing force to be stored in the compression spring via the slider (D4), the regulating block (D2) moves toward the slider (D4), releasing the elastic potential energy of the compression spring, and the thrust generated in the compression spring causes the slider (D4) to move in sync with the regulating block (D2).

8. The seat lumbar support according to claim 7, characterized in that a guide rod (D6) extending along the height direction is fixedly installed on the base (B), the compression spring, slider (D4), and regulating block (D2) are fitted sequentially along the height direction on the guide rod (D6), and the slider (D4) and regulating block (D2) are slidable up and down relative to the guide rod (D6).

9. The base (B) is provided with a rotating shaft (B1) and a first drive mechanism (C) for rotationally driving the rotating shaft (B1). Two sets of pressing arms (B2) are connected to the rotating shaft (B1), and a support portion (B3) is attached to one end of each of the two sets of pressing arms (B2) that is away from the rotating shaft (B1). Two annular grooves (B11) are provided symmetrically on the rotating shaft (B1), and the upper ends of the pressing arms (B2) are rotatably fitted into the corresponding annular grooves (B11). The side walls on both sides of each annular groove (B11) are provided so as to be inclined with respect to the center line of the rotating shaft (B1), and both sides of the end of each pressing arm (B2) closer to the rotating shaft (B1) are slidably in contact with the side walls on both sides of the corresponding annular grooves (B11). The seat lumbar support according to claim 5, characterized in that when the receiving plate (B5) is in its lowest position, the first drive mechanism (C) rotates the rotating shaft (B1), and the pressing arm (B2) is forcibly swung back and forth along the axial direction of the rotating shaft (B1) by the transmission of the inclined side wall of the annular groove (B11) and the restrictive action of the connecting rod (D5), and an opening (B51) is provided in the center of the receiving plate (B5), and the width of the opening (B51) matches the minimum distance between the support parts (B3) of the two pressing arms (B2).

10. The seat lumbar support according to claim 9, characterized in that the rotating shaft (B1) includes a central shaft (B12) and a sleeve (B13) fixedly fitted onto the central shaft (B12), the sleeve (B13) has an annular groove (B11), one end of the pressing arm (B2) has an annular sleeve hole (B21) that fits into the annular groove (B11), and the annular sleeve hole (B21) is rotatably fitted into the annular groove (B11).

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