Mechanical lumbar and back massage assembly and car seat

Abstract

We provide improved mechanical lumbar and back massage assemblies and automotive seats. [Solution] The mechanical lumbar and back massage assembly is mounted inside the backrest of a car seat and comprises a mounting base B, the mounting base B comprises a mounting base plate 1 and a support plate 2 assembled to slide on the mounting base plate 1, the mounting base plate 1 is assembled inside the backrest of the seat, and the support plate 2 can slide along the height direction of the mounting base plate 1. The support plate 2 is provided with a first rotation axis B1 and a first drive mechanism that drives the rotation of the first rotation axis B1, two sets of massage arms B2 are connected to the first rotation axis B1 so as to rotate, the two sets of massage arms B2 are arranged symmetrically along the width direction of the mounting base B, and a massage head B3 is provided at one end of each of the two sets of massage arms B2 that are away from the first rotation axis B1.

Description

Technical Field

[0005] , ,

[0001] The present invention relates to the technical field of automobile seats, and more specifically, to a mechanical lumbar and back massage assembly and an automobile seat.

Background Art

[0002] As technology advances, the requirements for the comfort of automobile seats are becoming increasingly strong. Therefore, more seats have begun to be equipped with massage functions to relieve physical fatigue and muscle stiffness caused by long-term driving or riding, thereby enhancing the comfort of users during riding.

[0003] In the prior art, automobile massage machines can be divided into two types: airbag massage and mechanical massage. Among them, the airbag massage uses a flexible airbag in the lumbar and back region of the user, and the massage force is relatively low, the massage effect is inferior, and it is difficult to deeply relax the user's body comprehensively. On the other hand, many mechanical massage devices directly act on and press the user's back by a rotatable massage device. The massage force is greater than that of the airbag massage, but it has the disadvantages of large volume and single massage method, and there is still a relatively large difference compared with dedicated massage seats or human massage.

[0004] Therefore, it is urgent to design a massage mechanism with various massage functions to enhance the massage effect and enrich the functions of the seat.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of this, the first object of the present invention is to provide a mechanical lumbar and back massage assembly that has both kneading massage function and pounding massage function, has the advantages of compact structural arrangement and excellent massage effect.

Means for Solving the Problems

[0006] To achieve the above-mentioned objectives, the technical solutions of the present invention are as follows.

[0007] A mechanical lumbar and back massage assembly comprising a mounting base for assembly within the backrest of a chair, the mounting base being provided with a first rotation axis and a first drive mechanism for driving the rotation of the first rotation axis, two sets of massage arms being mounted to rotate on the first rotation axis, the two sets of massage arms being arranged along the width direction of the mounting base, and a massage head being provided at one end of each of the two sets of massage arms that are away from the first rotation axis. The first rotating shaft is provided with two annular grooves, and one end of each of the two sets of massage arms is fitted into the two annular grooves so as to rotate, and the side walls on both sides of the annular grooves are inclined with respect to the center line of the first rotating shaft, and both sides of the end of the massage arm closest to the first rotating shaft are in sliding contact with the side walls on both sides of the annular grooves, respectively. The first drive mechanism drives the rotation of the first rotating shaft, and by transmitting motion through the inclined side walls of the annular groove, the massage arm is made to reciprocate along the axial direction of the first rotating shaft, thereby causing the massage head at the far end to generate a kneading massage. A mechanical lumbar and back massage assembly is characterized in that the mounting base is provided with a second drive mechanism, the second drive mechanism drives the massage arm to reciprocate within a certain range relative to the first rotation axis, so that the massage head at the far end generates a percussive massage.

[0008] By adopting the above structure, after integrating this device inside the backrest of the chair, a cover is provided on the surface of the backrest. When the kneading massage device is activated, the first drive mechanism C drives the rotation of the first rotation axis and transmits it to the massage arm. The massage head B3 at the far end of the massage arm receives resistance from the chair cover or the user's back, so the massage arm cannot perform circular motion around the first rotation axis, and the massage head B3 acts continuously on the user's back. Furthermore, since an inclined surface cam transmission is configured between the inclined side wall of the annular groove B11 and the side wall of the massage arm, the rotation of the first rotation axis allows the massage arm to reciprocate along the axial direction of the first rotation axis. That is, the massage arm can swing from side to side, thereby causing the massage head B3 at the far end to generate a reciprocating kneading massage on the user's back. The second drive mechanism drives the two sets of massage arms to swing back and forth toward the front of the backrest, that is, toward the user's lower back, and can be linked so that the massage heads at the far ends of the two sets of massage arms perform a back-and-forth tapping massage on the user's back.

[0009] Preferably, the mounting base comprises a mounting base plate for assembly inside the backrest of a seat chair, and a support plate connected to the mounting base plate so as to slide along the height direction of the mounting base plate, the support plate sliding along the height direction of the mounting base plate, the first rotating shaft, the first drive mechanism, and the second drive mechanism provided on the support plate, and the third drive mechanism provided on the mounting base plate, the third drive mechanism for driving the sliding base to slide along the height direction of the mounting base plate.

[0010] Preferably, the second drive mechanism comprises a second rotating shaft located below two sets of massage arms, and a second drive assembly that drives the rotation of the second rotating shaft, wherein two transmission covers are rotatably fitted onto the second rotating shaft, the centerlines of the two transmission covers are both eccentrically positioned with respect to the centerline of the second rotating shaft, and the two transmission covers correspond to one of the two sets of massage arms, and a connecting rod is provided between the transmission cover and the corresponding massage arm, one end of the connecting rod is hinged to the transmission cover, and the other end is hinged to the center of the massage arm. The second drive assembly drives the rotation of the second rotating shaft and, through the eccentric transmission of the transmission cover, can be linked to cause the massage arm to reciprocate within a certain range.

[0011] Preferably, the eccentric directions of the two transmission covers are opposite.

[0012] Preferably, the first rotating shaft comprises a central shaft and a sleeve provided to fix and cover the central shaft, the annular groove is provided in the sleeve, and one end of the massage arm has an annular sleeve hole that fits into the annular groove, and this annular sleeve hole is fitted to rotate and cover the annular groove.

[0013] Preferably, a support member and a thrust mechanism for controlling the sliding of the support member are assembled to slide on the mounting base, the second rotation axis is provided to rotate over the support member, the support member slides and the massage arm rotates around the first rotation axis via a connecting rod, thereby allowing the massage head to move away from or closer to the mounting base.

[0014] Preferably, the thrust mechanism comprises a limit block that abuts against the support member, and a first drive assembly that drives the limit block to move along the sliding direction of the support member, wherein an elastic element is provided between the mounting base and the support member, and a force is applied to this elastic element that causes the support member to abut against the limit block, and when the massage head is subjected to external pressure, the support member slides over the resistance of the elastic element, thereby causing the massage head to move toward the mounting base.

[0015] Preferably, the system further includes a support plate for being installed within the backrest of the chair, the support plate being located on the front side of the mounting base, and the two sets of massage arms being positioned vertically between the mounting base and the support plate, with an opening in the center of the support plate, the width of which conforms to the minimum distance between the two sets of massage arms and massage heads. The first drive mechanism drives the rotation of the first rotating shaft, and through the transmission of the inclined side walls of the annular groove and the restrictive action of the connecting rod, the massage arm is made to reciprocate along the axial direction of the first rotating shaft. After the distance between the two sets of massage arms is increased, the thrust mechanism drives the sliding of the support member, and the connecting rod interlocks the massage arm to rotate around the first rotating shaft, thereby allowing the massage head to push so that the receiving plate moves forward relative to the mounting base.

[0016] A second object of the present invention is to provide a car seat characterized by comprising a backrest, wherein the above-mentioned mechanical lumbar and back massage assembly is integrated and mounted inside the backrest.

[0017] Preferably, the backrest includes a backrest foam, the front surface of the backrest foam has a recessed area, the recessed area has two sets of rod-shaped through grooves extending along the height direction of the backrest, the front side of the backrest foam has an abrasion-resistant cloth, the abrasion-resistant cloth has a cover layer that covers the surface of the backrest foam, the rear side of the cover layer has an expandable layer, and the expandable layer is arranged within the recessed area so as to be folded.

[0018] The mechanical lumbar and back massage assembly is mounted on the rear side of the backrest foam, and the two sets of massage arms correspond to one of the two sets of rod-shaped through grooves, each of which rotates around a first axis of rotation, and the massage heads at their far ends extend into the corresponding rod-shaped through grooves and act on the abrasion-resistant fabric, and when the abrasion-resistant fabric receives outward thrust from the massage heads, the stretchable layer can be expanded outward, thereby allowing the abrasion-resistant fabric to protrude outward. [Effects of the Invention]

[0019] Compared to the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. By adopting the mechanical lumbar and back massage assembly provided by the present invention, the movement of two sets of massage arms can be controlled so that the massage head at the far end can perform a tapping or kneading massage on the user's back, and it has the technical advantages of being simple in structure, compact, and fully functional.

[0021] 2. By adopting the mechanical lumbar and back massage assembly provided by the present invention, it is possible to realize massage functions such as fixed-point kneading, fixed-point tapping, moving kneading, moving tapping, and moving acupressure, as well as further providing a lumbar support function, thereby enhancing the user's riding experience and comfort. Moreover, due to its rational and compact structural arrangement, this device can be integrated into the backrest in an even thinner and more compact form.

[0022] 3. When the mechanical lumbar and back massage assembly provided by the present invention is adopted, in the state of using the lumbar support or the massage function, if a vehicle collision or other sudden situations occur, the recoverable expansion and contraction of the massage arm and the massage head can be realized, ensuring the safety of using the massage and the lumbar support.

Brief Description of the Drawings

[0023] [Figure 1] It is a schematic diagram in which the mechanical lumbar and back massage assembly is integrated in the backrest A. [Figure 2] It is a schematic structural diagram of the backrest foam A1. [Figure 3] It is a schematic structural diagram of the wear-resistant cloth A2. [Figure 4] It is a schematic structural diagram of the mechanical lumbar and back massage assembly. [Figure 5] It is a partial cross-sectional view of the first rotating shaft B1. [Figure 6] It is a schematic structural diagram of the mechanical lumbar and back massage assembly in the use state. [Figure 7] It is another schematic structural diagram of the mechanical lumbar and back massage assembly in the use state. [Figure 8] It is a cross-sectional view of the mechanical lumbar and back massage assembly in the unused state. [Figure 9] It is a cross-sectional view of the mechanical lumbar and back massage assembly in the use state. [Figure 10] It is a schematic structural diagram of the second rotating shaft D1. [Figure 11] It is a schematic diagram showing the positional relationship between the support member B4 and the thrust mechanism F. [Figure 12] It is a front view of the mechanical lumbar and back massage assembly (with the receiving plate B5 connected). [Figure 13] It is a schematic diagram of the mechanical lumbar and back massage assembly when using the lumbar support.

Embodiments for Carrying Out the Invention

[0024] The present invention will now be further described with reference to examples and drawings.

[0025] As shown in Figure 1, this is a car seat equipped with a backrest A, and a mechanical lumbar and back massage assembly is integrated and mounted inside the seat backrest A. As shown in Figure 4, the mechanical lumbar and back massage assembly is equipped with a mounting base B, and in this embodiment, the mounting base B is equipped with a mounting base plate 1 and a support plate 2 assembled to slide on the mounting base plate 1, the mounting base plate 1 is assembled inside the seat backrest A, and the support plate 2 can slide along the height direction of the mounting base plate 1. Referring to Figure 7, the support plate 2 is provided with a first rotation axis B1 and a first drive mechanism C that drives the rotation of the first rotation axis B1, two sets of massage arms B2 are connected to the first rotation axis B1 so as to rotate, the two sets of massage arms B2 are arranged symmetrically along the width direction of the mounting base B, and a massage head B3 is provided at one end of each of the two sets of massage arms B2 that are away from the first rotation axis B1. In this embodiment, the massage head B3 is a massage roller. Referring to Figures 5 and 7, the first rotating shaft B1 is provided with two annular grooves B11, and one end of each of two sets of massage arms B2, located away from the massage head B3, is rotatably fitted into the two annular grooves B11. Both side walls of the annular grooves B11 are inclined with respect to the centerline of the first rotating shaft B1, that is, an angle r is generated between the centerline of the annular grooves B11 and the centerline of the first rotating shaft B1, and both ends of one end of the massage arm B2 closest to the first rotating shaft B1 are in sliding contact with the side walls of the annular grooves B11. The first drive mechanism C drives the rotation of the first rotating shaft B1, and the transmission of motion through the inclined side walls of the annular grooves B11 causes the massage arms B2 to reciprocate along the axial direction of the first rotating shaft B1, thereby enabling the massage head B3 at the far end to generate a kneading massage. Figure 6 shows that the support plate 2 is further provided with a second drive mechanism D, which drives the massage arm B2 to reciprocate within a certain range, thereby causing the massage head B3 at the far end to generate a percussive massage.

[0026] Based on the structural design described above, the mechanical lumbar and back massage assembly has at least two types of massage functions: kneading and tapping. The operating principle of the kneading massage is as follows: After integrating this device inside the backrest of the chair, a cover is provided on the surface of the backrest. When the kneading massage device is operated, the first drive mechanism C drives the rotation of the first rotation axis B1 and transmits it to the massage arm B2. The massage head B3 at the far end of the massage arm B2 receives resistance from the chair cover or the user's back, so the massage arm B2 cannot perform circular motion around the first rotation axis B1, and the massage head B3 acts continuously on the user's back. Furthermore, since an inclined surface cam transmission is configured between the inclined side wall of the annular groove B11 and the side wall of the massage arm B2, the massage arm B2 can be made to reciprocate along the axial direction of the first rotation axis B1 by the rotation of the first rotation axis B1. In other words, the massage arm B2 can swing from side to side, which allows the massage head B3 at the far end to generate a reciprocating kneading massage on the user's back, resulting in an excellent massage effect. In this embodiment, since the two sets of massage arms B2 are arranged symmetrically, the swing trajectories of the two massage heads B3 are also symmetrical along the user's spine, ensuring consistency in meridian massage on both sides of the spine and providing a comfortable massage.

[0027] The operating principle of the percussive massage is as follows: When the user needs to perform a percussive massage with the massage head B3, the second drive mechanism D drives the two sets of massage arms B2 to reciprocate and swing toward the front of the backrest, that is, toward the user's lower back. This allows the massage head B3 at the far end of the two sets of massage arms B2 to perform a reciprocating percussive massage on the user's back, thereby relaxing the meridians on both sides of the spine on the user's back. This structural design allows for the realization of two types of massage functions by providing two sets of massage arms B2 and a massage head B3, and has the technical advantages of being simple, compact, and highly functional.

[0028] Furthermore, referring to Figure 4, a third drive mechanism E is provided on the mounting base plate 1, and the third drive mechanism E can drive the support plate 2 to move up and down along the height direction of the mounting base plate 1. When the massage head B3 performs kneading or tapping massage on the user's lower back, the third drive mechanism E drives the support plate 2 to move up and down, and the two massage heads B3 can move up and down along the meridians on both sides of the user's spine in conjunction, thereby simulating the massage functions of moving kneading massage and moving tapping massage, further enhancing the functionality of the device and improving the massage effect. In addition, the first drive mechanism C and the second drive mechanism D operate simultaneously, and by combining this with the up and down movement of the third drive mechanism E, the two massage heads B3 can perform a massage operation on the user's back that adds tapping to moving kneading, further upgrading the massage effect.

[0029] Referring to Figure 4, the third drive mechanism E comprises a linear drive unit E1 provided at the left end of the mounting base plate 1 and a guide assembly E2 provided at the right end. The linear drive unit E1 can drive the support plate 2 to move up and down, and the guide assembly E2 can guide the support plate 2 to move up and down, making the up and down movement of the support plate 2 on the mounting base plate 1 even smoother. The advantages of this design are that by providing the linear drive unit E1 and the guide assembly E2 at both ends, a mounting space can be left in the center of the support plate 2, which is convenient for mounting the massage member, has the advantages of a rational arrangement and compactness, and helps to integrate the product into the back of the chair in a thinner and more compact form. Specifically, the linear drive unit E1 comprises a first screw E11 extending along the height direction of the mounting base plate 1, a nut cover E12 fitted to the first screw E11, and a first motor E13 that drives the rotation of the nut cover E12. The first screw E11 is located at the left end of the mounting base plate 1. Both ends of the first screw E11 are fixedly supported to the mounting base plate 1 by support bases. The first motor E13 is fixedly mounted to the support plate 2 and drives the rotation of the nut cover E12, which can be linked to cause the nut cover E12 to move up and down in a spiral motion along the axial direction of the first screw E11, thereby linking the first motor E13 and the entire support plate 2 to move up and down. The guide assembly E2 includes a guide rail E21 fixed to the right end of the mounting base plate 1. The guide rail E21 extends along the height direction of the mounting base plate 1, and a first roller (not shown) is provided at a position corresponding to the guide rail E21 on the bottom of the support plate 2. The first roller is in sliding contact with the bottom of the guide rail.

[0030] As shown in Figures 5 and 7, the first rotating shaft B1 comprises a central shaft B12 and a sleeve B13 provided to fix and cover the central shaft B12, with an annular groove B11 opening in the sleeve B13. One end of the massage 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. The first drive mechanism C directly drives the rotation of the central shaft B12 and can link the rotation of the sleeve B13, so that the sleeve B13 rotates continuously, causing the two side walls of the annular groove B11 to rotate and cause the annular sleeve hole B21 to reciprocate along the axial direction of the central shaft B12, thereby linking the massage head B3 at the far end of the massage arm B2 to swing from side to side.

[0031] Referring to Figures 6 and 10, the first drive mechanism D comprises a second rotation shaft D1 provided on the support plate 2, and a second drive assembly D2 that drives the rotation of the second rotation shaft D1, the second rotation shaft D1 being located below the two sets of massage arms B2. Two transmission covers D3 are rotatably fitted onto the second rotation shaft D1, and the two transmission covers D3 are positioned correspondingly below the two sets of massage arms B2. In this embodiment, the centerlines of the two transmission covers D3 are both eccentric with respect to the centerline of the second rotation shaft D1. A connecting rod D4 is provided between the transmission cover D3 and the corresponding massage arm B2, one end of which is hinged to the transmission cover D3, and the other end is hinged to the center of the massage arm B2. The second drive assembly D2 drives the rotation of the second rotation shaft D1, and through the eccentric transmission of the transmission cover D3, the connecting rod D4 is linked to cause the corresponding massage arm B2 to reciprocate within a certain range, thereby enabling a reciprocating tapping massage on the user's back by the massage head B3. In this embodiment, the second drive assembly D2 drives the rotation of the second rotation shaft D1 so that the motor directly drives it. In other embodiments, when using the kneading massage function, the resistive force preventing the massage arm B2 from circumferentially moving around the first rotation shaft B1 may come from the connecting rod 4. The first drive mechanism C drives the rotation of the first rotation shaft B1, and through the transmission of the inclined side walls of the annular groove B11 and the restrictive action of the connecting rod D4, the massage arm B2 is made to reciprocate along the axial direction of the first rotation shaft B1. In this process, the connection between the connecting rod D4 and the massage arm B2 is a ball joint.

[0032] Figure 10 shows that the two sets of eccentric shaft portions D11 are oriented in the opposite direction to the eccentricity of the centerline of the second rotation axis D1. In the initial state, the centerline m of the left eccentric shaft portion D11 is eccentrically positioned downward with respect to the centerline n of the second rotation axis D1, while the centerline k of the right eccentric shaft portion D11 is eccentrically positioned upward with respect to the centerline n of the second rotation axis D1. With this design, when the second rotation axis D1 rotates, the two sets of eccentric shaft portions D11 can drive the two sets of massage arms B2 to swing in different directions, causing the two massage heads B3 to generate a reciprocating tapping massage on the user's back, thereby enhancing the massage experience.

[0033] Referring to Figures 6 and 11, a support member B4 and a thrust mechanism F that controls the sliding of the support member B4 are assembled to slide on the support plate 2, and a second rotation axis D1 is provided to rotate over the support member B4. The support member B4 slides and can be linked to the movement of the second rotation axis D1, thereby linking the massage arm B2 to rotate around its center of rotation via a connecting rod D4, so that the massage head B3 can move away from or closer to the mounting base B. Based on this, when the massage function is not in use, the massage head B3 and massage arm B2 are housed within the backrest, that is, the position in which the massage head B3 is closer to the support plate 2 is shown in Figure 4, so that the massage head B3 does not protrude from the backrest and cause discomfort to the user's lower back, and the comfort of normal riding is ensured. When the user needs to perform a percussive massage using the massage head B3, the support member B4 slides in conjunction with the rotation of the massage arm B2 outward, so that the massage head B3 at the far end of the massage arm B2 is pushed forward towards the backrest and acts on the passenger's lower back. Subsequently, the second drive assembly D2 drives the rotation of the second rotation axis D1, causing the massage head B3 at the far end to generate a reciprocating percussive massage on the user's back. After the massage is complete, the thrust mechanism F drives the sliding of the support member B4 so that the massage arm B2 rotates toward the support plate 2, thereby causing the massage head B3 to be retrieved toward the support plate 2. In addition, by controlling the outward rotation angle of the massage arm B2, the depth of the percussive massage of the massage head B3 can be adjusted, so that users of various body types can all obtain an effective massage. The principle for using the kneading massage function is the same: first, the massage head B3 is pushed forward towards the backrest, and then the kneading massage is performed, which will not be explained again here.

[0034] Referring to Figures 8 and 9, the thrust mechanism F comprises a limit block F2 that abuts against the support member B4, and a first drive assembly F3 that drives the limit block F2 to move along the sliding direction of the support member B4. An elastic element F1 is provided between the support plate 2 and the support member B4. A force is applied to this elastic element F1 that causes the support member B4 to abut against the limit block F2. When the massage head B3 is subjected to external pressure, the support member B4 slides over the resistance of the elastic element F1, allowing the massage head B3 to move toward the support plate 2. With this design, when the user needs to use the massage head B3 for massage, the first drive assembly F3 drives the limit block F2 to move away from the support member B4. In this process, the elastic element F1 applies a force that causes the support member B4 to continuously contact the limit block F2. As a result, the support member B4 moves synchronously with the limit block F2, and the second rotation axis D1 moves synchronously. This, in conjunction with the interlocking action of the connecting rod D4, causes the massage arm B2 to rotate outward relative to the first rotation axis B1, allowing the massage head B3 at the far end of the massage arm B2 to be pushed outward toward the front of the backrest A. After the massage is completed, the first drive assembly F3 drives the limit block F2 to move toward the support member B4. At this time, the limit block F2 pushes the support member B4, overcoming the resistance of the elastic element F1 and causing it to slide. This, in conjunction with the interlocking action of the connecting rod D4, causes the massage arm B2 to rotate inward, allowing the massage head B3 to be retrieved toward the support plate 2.

[0035] This structural design further enhances the passive extension and retraction function of the massage head B3 during its operation, specifically as follows: When the massage head B3 is subjected to an external force due to a collision with a vehicle or other sudden event, the support member B4 overcomes the resistance of the elastic element F1 and synchronizes the sliding of the second rotation axis D1. The connecting rod D4 then synchronizes to quickly retract the massage head B3 towards the support plate 2, effectively preventing injury to the human body from the massage head B3 and enhancing the safety of the massage. When the external force is removed, the elastic element F1 resets and pushes the sliding of the support member B4, thereby synchronizing the massage arm B2 and the massage head B3 to automatically return to their operating positions. This design prevents damage to the massage head B3, saves costs, eliminates the hassle of parts replacement, and offers the advantage of good practicality.

[0036] The elastic element F1 may be a compression spring, tension spring, torsion spring, leaf spring, or leaf spring. In this embodiment, the elastic element F1 is a compression spring. Referring to Figures 8 and 9, the compression spring is in contact with the support member B4 and the lower end of the support plate 2. When the limit block F2 moves downward along the height direction of the support plate 2, that is, in a direction closer to the compression spring, the support member B4 pushes downward to compress the compression spring, allowing the compression spring to store force. When the support member B4 moves downward, the massage arm B2 can be linked by the connecting rod D4 to rotate toward the support plate 2. When the limit block F2 moves away from the support member B4, that is, upward, the elastic potential energy of the compression spring can be released, and the thrust generated by the compression spring can cause the support member B4 to move synchronously with the limit block F2, thereby allowing the massage arm B2 to rotate outward by the connecting rod D4. In this state, when the massage head B3 is subjected to external pressure, the support member B4 can press the compression spring downward, and the connecting rod D4 interlocks with it so that the massage arm B2 is quickly retracted toward the support plate 2. When the external force is removed, the compression spring releases its energy, pushing the support member B4 upward until it contacts the limit block F2. At this point, the massage arm B2 returns to its operating position, and the massage head B3 is not damaged by the external force.

[0037] As shown in Figures 7 and 8, a guide rod F4 extending along its height is fixedly provided on the support plate 2, and the elastic element F1, support member B4, and limit block F2 are fitted onto the guide rod F4 sequentially from bottom to top, and the support member B4 and limit block F2 can slide up and down relative to the guide rod F4. This design ensures the reliability of the mounting and movement of the elastic element F1, support member B4, and limit block F2.

[0038] As shown in Figures 7 and 8, the first drive assembly F3 includes a second motor F31 fixed to the support plate 2, and a second screw F32 whose rotation is driven by the second motor F31. The second screw F32 extends along the height direction of the support plate 2, and the limit block F2 is fitted to the second screw F32 by screw threads. When the second motor F31 drives the rotation of the second screw F32, the limit block F2 can be linked to move along the second screw F32. To ensure the compactness of the overall structure and the uniformity of the force received by the support member B4, two sets of guide rods F4 are provided, and the two sets of guide rods F4 are arranged symmetrically along the width direction of the support plate 2, with the second screw F32 located between the two sets of guide rods F4. Elastic elements F1 are fitted to both sets of guide rods F4, and both ends of the limit block F2 and both ends of the support member B4 are connected to the two guide rods F4 so as to slide. The second motor F31 drives the limit block F2 to move downward, which can be coordinated to cause the support member B4 to simultaneously press the two sets of elastic elements F1, and consequently to cause the two sets of massage arms B2 to be retracted inward, thereby ensuring the synchronization of the movement of the two sets of massage arms B2.

[0039] The mechanical lumbar and back massage assembly provided by this embodiment can perform massage functions such as kneading and tapping, as well as simulate mobile acupressure massage, specifically as follows: The support member B4 slides in conjunction with the massage arm B2 to rotate outward, so that the massage head B3 at the far end of the massage arm B2 is pushed outward towards the front of the backrest to act on the occupant's lumbar and back areas. The third drive mechanism E drives the support plate 2 to move up and down along the mounting base plate 1, that is, so that the massage head B3 moves up and down along the meridians on both sides of the user's spine, thereby simulating the massage function of mobile acupressure.

[0040] Referring to Figure 12, the mechanical lumbar and back massage assembly further comprises a support plate B5 located within the backrest of a chair, which is positioned in front of the mounting base B, and two sets of massage arms B2 are positioned vertically between the mounting base B and the support plate B5. An opening B51 is provided in the center of the support plate B5, and the width of this opening B51 conforms to the minimum distance between the two sets of massage arms B2 and the massage head B3. Referring to Figure 13, the first drive mechanism C drives the rotation of the first rotating shaft B1, and through the transmission of the inclined side wall of the annular groove B11 and the restrictive action of the connecting rod D4, the massage arm B2 is able to reciprocate along the axial direction of the first rotating shaft B1. After the distance between the two sets of massage arms B2 is increased, the thrust mechanism F drives the sliding of the support member B4, and the connecting rod D4 can interlock the movement of the massage arm B2 so that it rotates around the first rotating shaft B1, thereby allowing the massage head B3 to push so that the receiving plate B5 moves forward relative to the mounting base B. In this embodiment, the receiving plate B5 is a soft plastic plate, and its upper end is fixedly connected to the upper end of the support plate 2.

[0041] The advantage of this design is that, in addition to the ability of the device to perform various massage functions, it also has a lumbar support function, specifically as follows: When using the lumbar support, the first drive mechanism C first drives the rotation of the first rotating shaft B1 and transmits it to the massage arm B2. An inclined surface cam transmission is configured between the inclined side wall of the annular groove B11 and the side wall of the massage arm B2. Furthermore, due to the constraint effect of the connecting rod D4, the rotation of the first rotating shaft B1 causes the massage arm B2 to reciprocate along the axial direction of the first rotating shaft B1. That is, the massage arm B2 can swing from side to side, thereby linking the left-right swing of the massage head B3. Since the two annular grooves B11 are provided symmetrically, the swing trajectories of the two massage heads B3 are also symmetrical to each other, meaning that the two massage heads B3 can move closer to or further apart from each other. After widening the distance between the two sets of massage heads B3, the support member B4 slides upward and the two sets of massage arms B2 rotate outward in conjunction, causing the massage heads B3 to push the receiving plate B5 forward, thereby providing auxiliary support to the rider's lower back.

[0042] When using the massage function, taking kneading massage as an example, the first drive mechanism C drives the first rotation axis B1 to rotate at a certain angle, thereby adjusting the distance between the two massage heads B3 to the minimum. The support member B4 slides upward, and the two sets of massage arms B2 rotate outward in conjunction, causing the two massage heads B3 to pass through the opening B51 facing forward. Subsequently, the first drive mechanism C drives the rotation of the first rotation axis B1 and transmits it to the massage arms B2, allowing the two massage heads B3 to knead the user's lower back. Conversely, after the massage is finished, the distance between the massage heads B3 is first adjusted to the minimum, and then they are retrieved through the opening B51 to a position close to the support plate 2.

[0043] As shown in Figures 1 and 2, the backrest A comprises a backrest form A1, the front surface of which a recessed area A11 is provided, and the recessed area A11 is provided with two sets of rod-shaped through grooves A12 extending along the height direction of the backrest. Referring to Figure 3, the front side of the backrest form A1 is provided with a wear-resistant cloth A2, the wear-resistant cloth A2 comprises a cover layer A21 that covers the surface of the backrest form A1, and the rear side of the cover layer A21 is provided with an expandable layer A22, the expandable layer A22 is positioned within the recessed area A11 so as to be folded. The mechanical lumbar and back massage assembly is mounted on the rear side of the backrest form A1, and two sets of massage arms B2 correspond to each of the two sets of rod-shaped through grooves A12. When the mechanical lumbar and back massage assembly is not operating, the massage arms B2 are positioned within the rod-shaped annular grooves A12 and are not pressing on the inside of the wear-resistant cloth A2. At this time, the cover layer A21 is guaranteed to be flat, ensuring a comfortable and non-uncomfortable user leaning back against the backrest. When the massage function is activated, the massage arm B2 rotates relative to the first rotation axis B1, and the massage head B3 at its far end extends into the corresponding rod-shaped through groove A12 and acts on the wear-resistant fabric A2. When the wear-resistant fabric A2 receives the outward thrust of the massage head B3, the expandable layer A22 can expand outward, allowing the wear-resistant fabric A2 to self-adapt and protrude outward, ensuring no discomfort whatsoever, and guaranteeing that the massage arm B2 can stably apply force for massage actions such as kneading, tapping, and acupressure.

[0044] Finally, it is necessary to explain that the above description is merely a preferred embodiment 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, and any such modifications will fall within the scope of protection of the present invention. [Explanation of symbols]

[0045] 1. Mounting base plate 2 Support plate A Backrest A1 Backrest Foam A2 wear-resistant cloth A11 Subsidence Area A12 Rod-shaped through groove A21 Cover layer A22 stretch layer B Mounting base B1 First rotation axis B2 Massage Arm B3 Massage Head B4 Support member 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 Second rotation axis D2 Second Drive Assembly D3 Transmission Cover D4 connecting rod D11 Eccentric shaft part E Third drive mechanism E1 Linear Drive Unit E2 Guide Assembly E11 No. 1 Screw E12 Nut Cover E13 First Motor E21 Guide Rail F thrust mechanism F1 Elastic element F2 Limit Block F3 First Drive Assembly F4 Guide Rod F31 Second Motor F32 No. 2 Screw k Center line of the eccentric axis portion D11 on the right side m Centerline of the eccentric axis portion D11 on the left side n Centerline of the second rotation axis D1 r inclusion angle

Claims

1. A mechanical lumbar and back massage assembly, The chair is equipped with a mounting base (B) for assembly within the backrest of the chair, the mounting base (B) is provided with a first rotating shaft (B1) and a first driving mechanism (C) for driving the rotation of the first rotating shaft (B1), two sets of massage arms (B2) are mounted on the first rotating shaft (B1) so as to rotate, the two sets of massage arms (B2) are arranged along the width direction of the mounting base (B), and a massage head (B3) is provided at one end of each of the two sets of massage arms (B2) that are away from the first rotating shaft (B1). The first rotating shaft (B1) is provided with two annular grooves (B11), and one end of each of the two sets of massage arms (B2) is fitted into the two annular grooves (B11) so as to rotate, and the side walls on both sides of the annular grooves (B11) are all provided so as to be inclined with respect to the center line of the first rotating shaft (B1), and both sides of the end of the massage arm (B2) closest to the first rotating shaft (B1) are in sliding contact with the side walls on both sides of the annular grooves (B11), respectively. The first drive mechanism (C) drives the rotation of the first rotating shaft (B1), and by transmitting motion through the inclined side wall of the annular groove (B11), the massage arm (B2) is made to reciprocate along the axial direction of the first rotating shaft (B1), thereby causing the massage head (B3) at the far end to generate a kneading massage. A mechanical lumbar and back massage assembly is characterized in that the mounting base (B) is provided with a second drive mechanism (D), the second drive mechanism (D) drives the massage arm (B2) to reciprocate within a certain range relative to the first rotation axis (B1), so that the massage head (B3) at the far end generates a percussive massage.

2. The mechanical lumbar and back massage assembly according to claim 1, characterized in that the mounting base (B) comprises a mounting base plate (1) for assembly inside the backrest of a chair, and a support plate (2) connected to the mounting base plate (1) so as to slide along the height direction of the mounting base plate (1), the support plate (2) comprising the first rotating shaft (B1), the first drive mechanism (C), and the second drive mechanism (D) provided on the support plate (2), and the mounting base plate (1) comprising a third drive mechanism (E) for driving the sliding base (2) to slide along the height direction of the mounting base plate.

3. The second drive mechanism (D) comprises a second rotating shaft (D1) located below two sets of massage arms (B2), and a second drive assembly (D2) that drives the rotation of the second rotating shaft (D1), wherein two transmission covers (D3) are fitted to the second rotating shaft (D1) so as to rotate, the centerlines of the two transmission covers (D3) are both eccentrically positioned with respect to the centerline of the second rotating shaft (D1), and the two transmission covers (D3) correspond to one of the two sets of massage arms (B2), a connecting rod (D4) is provided between the transmission cover (D3) and the corresponding massage arm (B2), one end of the connecting rod (D4) is hinged to the transmission cover (D3), and the other end is hinged to the center of the massage arm (B2), The mechanical lumbar and back massage assembly according to claim 1, characterized in that the second drive assembly (D2) drives the rotation of the second rotating shaft (D1), and the eccentric transmission of the transmission cover (D3) is linked to cause the massage arm (B2) to reciprocate within a certain range.

4. The mechanical lumbar and back massage assembly according to claim 3, characterized in that the eccentric directions of the two transmission covers (D3) are opposite.

5. The mechanical lumbar and back massage assembly according to claim 1, characterized in that the first rotating shaft (B1) comprises a central shaft (B12) and a sleeve (B13) provided to fix and cover the central shaft (B12), the annular groove (B11) is opened in the sleeve (B13), one end of the massage arm (B2) has an annular sleeve hole (B21) that fits into the annular groove (B11), and the annular sleeve hole (B21) is fitted to the annular groove (B11) so as to rotate.

6. The mechanical lumbar and back massage assembly according to claim 3, characterized in that a support member (B4) and a thrust mechanism (F) for controlling the sliding of the support member (B4) are assembled to slide on the mounting base (B), the second rotation axis (D1) is provided to cover the support member (B4) so ​​as to rotate, the support member (B4) slides, and the massage arm (B2) rotates around the first rotation axis (B1) via a connecting rod (D4), thereby allowing the massage head (B3) to move away from or closer to the mounting base (B).

7. The thrust mechanism (F) comprises a limit block (F2) that abuts against the support member (B4), and a first drive assembly (F3) that drives the limit block (F2) to move along the sliding direction of the support member (B4), wherein an elastic element (F1) is provided between the mounting base (B) and the support member (B4), and a force is applied to the elastic element (F1) that causes the support member (B4) to abut against the limit block (F2), and when the massage head (B3) is subjected to external pressure, the support member (B4) slides over the resistance of the elastic element (F1), thereby causing the massage head (B3) to move toward the mounting base (B), as described in claim 6.

8. The chair further includes a support plate (B5) to be installed inside the backrest of the chair, the support plate (B5) being located on the front side of the mounting base (B), and two sets of massage arms (B2) being arranged vertically between the mounting base (B) and the support plate (B5), an opening (B51) being provided in the center of the support plate (B5), the width of which matches the minimum distance between the two sets of massage arms (B2) and the massage head (B3), The mechanical lumbar and back massage assembly according to claim 6, characterized in that the first drive mechanism (C) drives the rotation of the first rotating shaft (B1), and the transmission of the inclined side wall of the annular groove (B11) and the restrictive action of the connecting rod (D4) cause the massage arm (B2) to reciprocate along the axial direction of the first rotating shaft (B1), and after the distance between the two sets of massage arms (B2) is increased, the thrust mechanism (F) drives the sliding of the support member (B4), and the connecting rod (D4) interlocks the massage arm (B2) to rotate around the first rotating shaft (B1), thereby causing the massage head (B3) to push so that the receiving plate (B5) moves forward relative to the mounting base (B).

9. It is a car seat, Equipped with a backrest (A), An automobile seat characterized in that a mechanical lumbar and back massage assembly according to any one of claims 1 to 8 is integrated inside the backrest (A).

10. The backrest (A) comprises a backrest foam (A1), the front surface of the backrest foam (A1) is provided with a recessed area (A11), the recessed area (A11) is provided with two sets of rod-shaped through grooves (A12) extending along the height direction of the backrest, the front side of the backrest foam (A1) is provided with an abrasion-resistant cloth (A2), the abrasion-resistant cloth (A2) comprises a cover layer (A21) that covers the surface of the backrest foam (A1), the rear side of the cover layer (A21) is provided with an expandable layer (A22), the expandable layer (A22) is arranged within the recessed area (A11) so as to be folded, The car seat according to claim 9, wherein the mechanical lumbar and back massage assembly is attached to the rear of the backrest foam (A1), and two sets of the massage arms (B2) correspond to one of two sets of the rod-shaped through grooves (A12), each of the massage arms (B2) rotates with respect to a first rotation axis (B1), and the massage heads (B3) at their far ends extend into the corresponding rod-shaped through grooves (A12) and act on the abrasion-resistant fabric (A2), and when the abrasion-resistant fabric (A2) receives an outward thrust from the massage heads (B3), the expandable layer (A22) can be expanded outward, thereby allowing the abrasion-resistant fabric (A2) to protrude outward.

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