A lumbar support device, a sofa applying the device, and a control method thereof

Abstract

The application discloses a waist support device, a sofa applying the device and a control method of the sofa, and relates to the technical field of sofas. The waist support device comprises a support frame assembly, a driving assembly is hinged to the upper part of the support frame assembly, a rocker arm transmission assembly is hinged to the lower part of the support frame assembly, an ejection support assembly is connected to the output end of the rocker arm transmission assembly, and the output end of the driving assembly is hinged to the rocker arm transmission assembly. The driving assembly can output a linear reciprocating driving force, drive the rocker arm transmission assembly to reciprocate around the hinged fulcrum between the rocker arm transmission assembly and the lower part of the support frame assembly, and make the ejection support assembly reciprocate along an arc-shaped track which is convex forward from top to bottom, so that the ejection and retraction of waist support are realized. The maximum ejection point of the device can accurately correspond to the lumbar region of the human body, match the physiological curvature of the lumbar vertebrae, and solve the problems of position deviation of the existing waist support and insufficient precision of waist support.

Description

Technical Field

[0001] This invention relates to the field of upholstered furniture functional components, specifically to a lumbar support device, a sofa using the device, and a control method thereof. Background Technology

[0002] The lumbar support mechanism is a common functional component in the backrests of upholstered furniture, primarily used to provide lumbar support and improve seating comfort. Current lumbar support mechanisms generally employ a bottom-mounted drive structure, where a drive component pushes the support component upwards to complete the ejection action. In this type of structure, the overall movement trajectory of the ejecting support component is from bottom to top, and the position with the greatest ejection is usually located in the upper part of the back. This cannot accurately correspond to the physiological curvature of the lumbar spine in a natural sitting posture, resulting in insufficient precision in lumbar support and failing to meet the user's demand for a high-quality seating experience. Summary of the Invention

[0003] The embodiments of the present invention provide a lumbar support device, a sofa using the device, and a control method thereof, which solves the technical problem of insufficient lumbar support accuracy in existing sofa lumbar support mechanisms.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a lumbar support device, including a support frame assembly. A drive assembly is hinged to the upper part of the support frame assembly, and a rocker arm transmission assembly is hinged to the lower part of the support frame assembly. The output end of the rocker arm transmission assembly is connected to a push-out support assembly. The output end of the drive assembly is hinged to the rocker arm transmission assembly. The drive assembly is capable of outputting a linear reciprocating driving force, which drives the rocker arm transmission assembly to reciprocate around its hinge point with the support frame assembly, causing the push-out support assembly to reciprocate along an arc-shaped trajectory that extends downwards and forwards, thereby achieving the push-out and retraction of lumbar support.

[0005] Furthermore, the drive assembly includes a motor unit, a transmission unit, and a telescopic rod unit. The motor unit is hinged to the upper part of the support frame assembly. The transmission unit is connected between the output end of the motor unit and the telescopic rod unit, and is used to convert the rotational motion of the motor unit into the linear reciprocating motion of the telescopic rod unit. The extended end of the telescopic rod unit is hinged to the rocker arm transmission assembly.

[0006] Furthermore, the transmission unit includes a reduction gear transmission group and a lead screw transmission group. The input end of the reduction gear transmission group is driven to the output shaft of the motor unit, the input end of the lead screw transmission group is driven to the output end of the reduction gear transmission group, and the output end of the lead screw transmission group is connected to the telescopic rod unit to drive the telescopic rod unit to perform linear telescopic motion along the axial direction.

[0007] Furthermore, the rocker arm transmission assembly includes a bent rocker arm body, which is provided with a drive hinge end, a rotary hinge end, and a support output end. The rotary hinge end is hinged to the lower part of the support frame assembly, the drive hinge end is hinged to the output end of the drive assembly, and the support output end is fixedly connected to the ejector support assembly. The rotary hinge end, drive hinge end, and support output end are triangularly distributed to form a lever transmission structure.

[0008] Furthermore, the ejection support assembly includes a transverse support member that extends along the width direction of the support frame assembly and is connected to the output end of the rocker arm transmission assembly.

[0009] Furthermore, the lumbar support device also includes a control assembly, which is signal-connected to the drive assembly and used to control the start / stop, forward / reverse rotation, and extension / retraction stroke of the drive assembly.

[0010] Furthermore, the control assembly includes a main control unit and at least one pressure sensing unit. The pressure sensing unit is fitted onto the outer surface of the push-out support component and is used to collect lumbar support pressure data in real time and transmit it to the main control unit. The main control unit is signal-connected to the drive component and is used to output control commands based on the received pressure data to adjust the extension stroke of the drive component and achieve adaptive lumbar support adjustment.

[0011] Furthermore, the pressure sensing unit is a flexible thin-film pressure sensor, used to collect real-time pressure values, pressure distribution areas, pressure change rates, and static pressure duration data of the user's waist.

[0012] Furthermore, the main control unit is configured to: drive the drive component to drive the ejection support component to complete the full stroke traverse, and calibrate and generate the corresponding user's lumbar support reference parameters based on the full stroke pressure data collected by the pressure sensing unit; and output adjustment commands to control the drive component to dynamically adjust the ejection amount based on the lumbar support reference parameters and real-time pressure data.

[0013] Furthermore, the main control unit incorporates a deep learning algorithm model to identify the user's leaning state and fatigue level in order to match the ejection stroke; the deep learning algorithm model can continuously iterate and optimize the adaptation parameters based on the user's historical usage data.

[0014] Furthermore, the motor unit has a built-in position detection subunit. The position detection subunit collects the rotation number data of the motor unit through Hall detection or brushless FOC algorithm, and calculates the real-time displacement of the telescopic rod unit according to the lead parameter of the lead screw drive group, and feeds the displacement data back to the control assembly.

[0015] Furthermore, the control assembly also includes a manual control unit, which is signal-connected to the main control unit and is used for users to manually input adjustment commands to control the extension and retraction of the drive component, as well as to switch between adaptive adjustment mode and manual locking mode; the manual adjustment mode has a higher priority than the adaptive adjustment mode.

[0016] According to another aspect of this application, an embodiment of the present invention provides a sofa, including a sofa back frame and a lumbar support device as described above, the lumbar support device being embedded inside the sofa back frame.

[0017] According to another aspect of this application, embodiments of the present invention provide a control method for a lumbar support device, applied to the lumbar support device as described above, comprising the following steps: Receive lumbar support adjustment commands and drive the components to perform extension and retraction actions; The drive assembly drives the rocker arm transmission assembly to reciprocate around the hinge point between it and the lower part of the support frame assembly. The rocker arm transmission assembly drives the push-out support assembly to reciprocate along an arc-shaped trajectory that extends from top to bottom and protrudes forward, completing the push-out or retraction action of the lumbar support.

[0018] Furthermore, when the adaptive adjustment mode is enabled, the following steps of adaptive top-to-bottom control are also performed: Upon receiving the start command for adaptive mode, self-learning calibration is performed, including: The drive component drives the ejection support component to complete the full stroke traverse, synchronously collecting lumbar pressure data and corresponding displacement data during the full stroke, and calibrating and generating user-specific lumbar support reference parameters; Real-time data collection of user lumbar support pressure and displacement data of the push-out support components; The current support status is determined by analyzing real-time data based on the lumbar support baseline parameters. Based on the analysis results, adjustment commands are output to control the drive components to dynamically adjust the ejection amount, thereby achieving adaptive lumbar support.

[0019] Furthermore, in the step of performing calculations and analyses on real-time data based on lumbar support reference parameters, a deep learning algorithm model is used to process real-time pressure data and displacement data, identify the user's leaning state and fatigue level, and dynamically match the optimal ejection stroke; the deep learning algorithm model can be continuously iteratively optimized based on the user's historical usage data.

[0020] Furthermore, it also includes a manual control switching step: receiving the user's manual adjustment command, controlling the drive component to adjust to the target top position and lock it, or switching to the adaptive adjustment mode.

[0021] Compared with the prior art, the lumbar support device of the present invention has the following advantages: The lumbar support device provided by this invention uses a support frame assembly as the overall mounting and bearing base. A drive assembly is hinged to the upper part of the support frame assembly, and a rocker arm transmission assembly is hinged to the lower part of the support frame assembly. An ejector support assembly is fixed to the output end of the rocker arm transmission assembly, and the power output end of the drive assembly is hinged to the power input end of the rocker arm transmission assembly. The drive assembly can output a linear reciprocating driving force, driving the rocker arm transmission assembly to reciprocate around its hinge point with the support frame assembly. This, in turn, drives the ejector support assembly to reciprocate along a downward-facing, forward-convex arc-shaped trajectory, thus realizing the ejection and retraction of the lumbar support.

[0022] In operation, when the drive assembly outputs a backward linear pulling force and the telescopic rod unit retracts, it drives the rocker arm transmission assembly to swing forward and downward with its hinge point with the lower part of the support frame assembly as the fulcrum. The output end of the rocker arm transmission assembly synchronously drives the ejector support assembly to move forward along an arc-shaped trajectory from top to bottom and protruding forward, providing support for the waist. When the drive assembly outputs a forward linear thrust and the telescopic rod unit extends, it drives the rocker arm transmission assembly to swing back and upward, causing the ejector support assembly to retract backward along the corresponding arc-shaped trajectory and return to the initial retracted state.

[0023] This invention places the rotation fulcrum of the rocker arm transmission assembly at the lower part of the support frame assembly and the hinge point of the drive assembly at the upper part of the support frame assembly. This results in the ejector support assembly's movement trajectory exhibiting an arc-shaped shape that bulges forward and downward from top to bottom. The maximum protrusion point of its ejection stroke precisely corresponds to the physiological position of the lumbar spine in a natural sitting posture, achieving a precise fit with the physiological curvature of the lumbar spine. Compared to traditional bottom-driven, bottom-up ejection lumbar support structures, this solution avoids the drawback of the maximum support point shifting to the upper back area from the root of the trajectory design, corrects the height deviation of the support trajectory, and effectively solves the technical problem of insufficient lumbar support precision in existing lumbar support mechanisms.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is an exploded structural diagram of the lumbar support device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-dimensional assembly structure of the lumbar support device provided in an embodiment of the present invention; Figure 3 A three-dimensional structural diagram of the lumbar support device provided in an embodiment of the present invention from another perspective; Figure 4 A side view of the lumbar support device in the retracted state according to an embodiment of the present invention; Figure 5 A side view of the lumbar support device provided in an embodiment of the present invention in the middle stroke state; Figure 6 A side view of the lumbar support device provided in an embodiment of the present invention in a fully extended state; Figure 7 A schematic diagram of the external three-dimensional structure of the drive component in the retracted state according to an embodiment of the present invention; Figure 8 A schematic diagram of the internal cross-sectional structure of the drive component in the retracted state according to an embodiment of the present invention; Figure 9 A schematic diagram of the external three-dimensional structure of the drive component in the extended state according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the internal cross-sectional structure of the drive component in the extended state according to an embodiment of the present invention; Figure 11 A side cross-sectional view of the lumbar support device provided in an embodiment of the present invention, installed on the back of a sofa and in a retracted state. Figure 12 A side sectional view of the lumbar support device provided in an embodiment of the present invention, installed on the back of a sofa and in a fully extended state. Explanation of reference numerals in the attached figures: 1. Support frame assembly; 2. Drive assembly; 21. Motor unit; 22. Transmission unit; 221. Reduction transmission group; 222. Screw transmission group; 23. Telescopic rod unit; 3. Rocker arm transmission assembly; 31. Rocker arm body; 32. Drive hinge end; 33. Rotary hinge end; 34. Support output end; 4. Push-out support assembly. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0028] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] In existing upholstered sofas, the lumbar support structure generally adopts a bottom-mounted drive layout. This means the drive component is located below the lumbar support structure and pushes the support component upwards. During operation, the movement trajectory of the support component is generally from bottom to top, with the point of maximum extension typically falling in the upper part of the back. This fails to precisely correspond to the physiological curvature of the lumbar spine in a natural sitting posture, directly resulting in positional misalignment and insufficient fit of the lumbar support, making it difficult to meet users' needs for precise lumbar support.

[0031] To solve the above-mentioned technical problems, this embodiment adopts an overall layout concept of upper drive and lower swing arm. The hinge point of the drive component is set on the upper part of the support frame, and the rotation fulcrum of the swing arm is set on the lower part of the support frame. The linear drive force pushes the swing arm to swing around the lower fulcrum, so that the ejected support component moves back and forth along an arc trajectory from top to bottom and forward. This ensures that the position with the largest ejection amount is precisely aligned with the lumbar spine area of ​​the human body, thereby improving the accuracy of lumbar support from the root of trajectory design.

[0032] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0033] Example 1 like Figures 1-10As shown, the lumbar support device provided in this embodiment includes a support frame assembly 1. A drive assembly 2 is hinged to the upper part of the support frame assembly 1, and a rocker arm transmission assembly 3 is hinged to the lower part of the support frame assembly 1. The output end of the rocker arm transmission assembly 3 is connected to a push-out support assembly 4. The output end of the drive assembly 2 is hinged to the rocker arm transmission assembly 3. The drive assembly 2 can output a linear reciprocating driving force and drive the rocker arm transmission assembly 3 to swing back and forth around its hinge point with the support frame assembly 1, so that the push-out support assembly 4 moves back and forth along an arc-shaped trajectory from top to bottom and protruding forward, thereby realizing the push-out and retraction of the lumbar support.

[0034] Specifically, the support frame assembly 1 serves as the rigid mounting base for the entire device and can be bolted to the internal frame of the sofa or bed backrest. All other functional components are directly or indirectly assembled onto the support frame assembly 1, forming a modular integrated structure that facilitates pre-assembly and subsequent maintenance. The drive assembly 2 and the rocker arm transmission assembly 3 are arranged vertically along the height of the support frame assembly 1, respectively hinged to the upper and lower parts of the frame, forming a stable linkage transmission system.

[0035] As described above, when the drive assembly 2 outputs a backward linear pulling force and the telescopic rod unit 23 retracts, it drives the rocker arm transmission assembly 3 to swing forward and downward around its hinge point with the lower part of the support frame assembly 1. The output end of the rocker arm transmission assembly 3 synchronously drives the ejector support assembly 4 to move, causing the ejector support assembly 4 to be ejected forward along an arc-shaped trajectory from top to bottom and protruding forward, thus achieving waist support. When the drive assembly 2 outputs a forward linear thrust and the telescopic rod unit 23 extends, it drives the rocker arm transmission assembly 3 to swing backward and upward, causing the ejector support assembly 4 to retract backward along an arc-shaped trajectory, returning to the initial state.

[0036] This embodiment arranges the rotation fulcrum of the rocker arm transmission assembly 3 at the lower part of the support frame assembly 1 and the hinge point of the drive assembly 2 at the upper part of the support frame assembly 1. This results in the movement trajectory of the ejector support assembly 4 being an arc shape that convexes forward from top to bottom. The position with the largest ejection amount corresponds precisely to the lumbar spine area in a natural sitting posture, accurately matching the physiological curvature of the lumbar spine. Compared to existing lumbar support structures with lower drive and ejection from bottom to top, this embodiment avoids the defect of the maximum ejection point shifting to the upper back area, effectively correcting the positional deviation of the support trajectory, thereby solving the technical problem of insufficient lumbar support accuracy in existing lumbar support mechanisms.

[0037] In a specific embodiment, the drive assembly 2 includes a motor unit 21, a transmission unit 22, and a telescopic rod unit 23. The motor unit 21 is hinged to the upper part of the support frame assembly 1. The transmission unit 22 is connected between the output end of the motor unit 21 and the telescopic rod unit 23, and is used to convert the rotational motion of the motor unit 21 into the linear reciprocating motion of the telescopic rod unit 23. The extended end of the telescopic rod unit 23 is hinged to the rocker arm transmission assembly 3.

[0038] In this embodiment, the drive assembly 2 is limited to an electric drive. Compared to pneumatic or hydraulic drive methods, electric drive offers higher control precision, a more compact size, and is better suited to the limited installation space inside the sofa backrest. The motor unit 21 is hinged to the upper ear plate of the support frame assembly 1 via a pin. It can adaptively adjust its deflection angle according to the extension and retraction of the telescopic rod unit 23, avoiding radial jamming during transmission and ensuring smooth transmission throughout the entire process. The transmission unit 22 is built between the motor unit 21 and the telescopic rod unit 23, serving as an intermediate carrier for motion conversion, smoothly converting the rotational motion output by the motor into the linear reciprocating motion of the telescopic rod. The extended end of the telescopic rod unit 23 is connected to the drive end of the rocker arm transmission assembly 3 via a hinge structure, directly transmitting linear thrust to the rocker arm structure.

[0039] Specifically, the transmission unit 22 includes a reduction transmission group 221 and a lead screw transmission group 222. The input end of the reduction transmission group 221 is driven by the output shaft of the motor unit 21, and the input end of the lead screw transmission group 222 is driven by the output end of the reduction transmission group 221. The output end of the lead screw transmission group 222 is connected to the telescopic rod unit 23, which drives the telescopic rod unit 23 to perform linear telescopic motion along the axial direction. The reduction transmission group 221 adopts a gear meshing structure, and its input end is synchronously driven by the output shaft of the motor unit 21. Its core function is to reduce the output speed of the motor and amplify the output torque, so that the lumbar support device has sufficient push-out force to stably bear the pressure generated by the human body leaning against it. As mentioned above, the lead screw transmission group 222, as the core component for linear conversion, converts the reduced rotational motion into axial linear motion. The lead screw transmission has the characteristics of smooth transmission, high positioning accuracy, and good self-locking, which can accurately control the telescopic stroke of the telescopic rod unit 23, and thus accurately control the push-out depth of the lumbar support.

[0040] In a specific embodiment, the rocker arm transmission assembly 3 includes a rocker arm body 31 that is bent. The rocker arm body 31 is provided with a drive hinge end 32, a rotary hinge end 33, and a support output end 34. The rotary hinge end 33 is hinged to the lower part of the support frame assembly 1, the drive hinge end 32 is hinged to the output end of the drive assembly 2, and the support output end 34 is fixedly connected to the ejector support assembly 4. The rotary hinge end 33, the drive hinge end 32, and the support output end 34 are triangularly distributed to form a lever transmission structure.

[0041] The rocker arm body 31 adopts a one-piece bent sheet metal structure, possessing sufficient structural strength to bear the lumbar support force. In the lever structure with three hinge ends distributed in a triangle, the rotary hinge end 33 is a fixed fulcrum, hinged to the lower part of the support frame assembly 1 via a pin, and is the fixed center of the rocker arm swing; the drive hinge end 32 is the power input point, receiving the linear thrust from the drive assembly 2; the support output end 34 is the power output point, fixedly connected to the ejector support assembly 4, converting the swing torque into support force. By pre-designing the bending angle of the rocker arm body 31 and the lever arm length between each hinge end, the arc of the motion trajectory of the ejector support assembly 4 and the maximum ejection stroke can be precisely controlled, adapting to sofa backrests of different specifications.

[0042] In a specific embodiment, the ejection support assembly 4 includes a transverse support member that extends along the width direction of the support frame assembly 1 and is connected to the support output end 34 of the rocker arm transmission assembly 3.

[0043] The transverse support extends laterally along the width of the support frame assembly 1, and its length can be adjusted to fit the width of the sofa back. The transverse support is fixedly connected to the support output end 34 of the rocker arm transmission assembly 3, which can convert the single-point swing force output by the rocker arm into a planar support force distributed along the width direction, so that the user's waist is more evenly stressed and avoids discomfort caused by local stress concentration. The transverse support can adopt various structural forms such as round tubes and arc-shaped support components to adapt to different internal shapes of the backrest upholstery.

[0044] In a specific embodiment, the lumbar support device further includes a control assembly, which is signal-connected to the drive component 2 and is used to control the start / stop, forward / reverse rotation, and extension / retraction stroke of the drive component 2.

[0045] The control assembly is the core electronic component of the lumbar support device. It can be fixed to the side of the support frame assembly 1 with screws, or it can be installed independently in an empty space in the sofa frame. The control assembly and the drive assembly 2 are connected by a signal line. It can receive external input adjustment commands and output corresponding electrical signals to control the start, stop, forward and reverse rotation, and travel of the drive assembly 2, thereby realizing the electric control of the lumbar support extension and retraction.

[0046] Specifically, the control assembly includes a main control unit and at least one pressure sensing unit. The pressure sensing unit is fitted onto the outer surface of the push-out support component 4 and is used to collect lumbar support pressure data in real time and transmit it to the main control unit. The main control unit is signal-connected to the drive component 2 and is used to output control commands according to the received pressure data to adjust the extension stroke of the drive component 2 and realize adaptive lumbar support adjustment.

[0047] The main control unit is the core computing carrier of the control assembly. The number of pressure sensing units can be set to one or more according to the support width, and they are evenly distributed on the outer surface of the ejector support component 4. As mentioned above, the pressure sensing units are fitted between the ejector support component 4 and the backrest sponge, and can directly collect the pressure data generated by the user's lumbar support, and transmit the data to the main control unit in real time. After analyzing and judging the received pressure data, the main control unit outputs the corresponding adjustment command to the drive component 2, automatically adjusting the extension stroke of the drive component 2, thereby realizing adaptive lumbar support adjustment without manual operation by the user.

[0048] More specifically, the pressure sensing unit is a flexible thin-film pressure sensor used to collect real-time pressure values, pressure distribution areas, pressure change rates, and static pressure duration data of the user's lumbar region. The flexible thin-film pressure sensor possesses the physical characteristics of being thin, flexible, and lightweight, allowing it to fit snugly against the curved outer surface of the support component 4 without forming protrusions inside the backrest cushion, thus not affecting the soft feel of the sofa back. As described above, this sensor can simultaneously collect multi-dimensional pressure-related data. The real-time pressure value is used to determine the current support intensity, the pressure distribution area is used to identify the lumbar region's contact position, the pressure change rate is used to identify changes in the user's sitting posture, and the static pressure duration is used to determine the user's prolonged sitting state. This multi-dimensional data provides a comprehensive basis for the adaptive adjustment of the main control unit.

[0049] In a specific embodiment, the main control unit is configured to: drive the drive component 2 to move the ejector support component 4 through its full stroke, and calibrate and generate lumbar support reference parameters corresponding to the user based on the full stroke pressure data collected by the pressure sensing unit; and output adjustment commands to control the drive component 2 to dynamically adjust the ejection amount based on the lumbar support reference parameters and real-time pressure data. The main control unit has a built-in control program that can realize two core functions: self-learning calibration and real-time adaptive adjustment. The self-learning calibration function is used to establish a user-specific support reference: when the calibration process is started, the main control unit controls the drive component 2 to move the ejector support component 4 from the fully retracted state to the maximum ejection state, completing the full stroke. During the process, the pressure sensing unit continuously collects lumbar pressure data at different strokes. The main control unit combines the pressure data with the corresponding stroke position to calculate and generate lumbar support reference parameters adapted to the current user's body type and sitting posture. After calibration, the main control unit uses the benchmark parameter as a reference and combines it with the real-time collected pressure data to determine the current support status. It then dynamically outputs adjustment commands to control the drive component 2 to adjust the ejection amount, so that the lumbar support always adapts to the user's current sitting posture.

[0050] In addition, the main control unit has a built-in deep learning algorithm model to identify the user's leaning state and fatigue level, and match the optimal ejection stroke; the deep learning algorithm model can continuously iterate and optimize the adaptation parameters based on the user's historical usage data.

[0051] In this embodiment, the deep learning algorithm model mounted on the main control unit is an existing, publicly available, and directly deployable general-purpose algorithm model. This embodiment does not improve the structure or training method of the algorithm itself, but only uses it as a data processing tool for the lumbar support adaptive adjustment scenario. As mentioned above, this algorithm model can extract features from real-time collected pressure and displacement data, accurately identify the user's leaning force, changes in sitting posture, and fatigue state after prolonged sitting, and match and output the optimal push-out stroke that better fits the user's current state; at the same time, the model can store the historical usage data of the same user, and continuously iterate and optimize the adaptation parameters in subsequent use. The longer the usage time, the better the personalized adaptation effect.

[0052] In a specific embodiment, the motor unit 21 has a built-in position detection subunit. The position detection subunit collects the rotation number data of the motor unit 21 through Hall detection or brushless FOC algorithm, and calculates the real-time displacement of the telescopic rod unit 23 according to the lead parameter of the lead screw transmission group 222, and feeds the displacement data back to the control assembly.

[0053] The position detection subunit is a built-in detection component of the motor unit 21, and it has two optional implementation forms: Hall sensor detection and brushless FOC algorithm detection, which can be configured according to the selected motor. As mentioned above, the position detection subunit collects the real-time rotation number of the motor unit 21, and combines it with the lead parameter of the lead screw transmission group 222 and the gear transmission ratio to calculate the real-time axial displacement of the telescopic rod unit 23, and then obtains the real-time ejection stroke data of the ejection support component 4. When the lumbar support device is equipped with a control assembly, this displacement data will be fed back to the control assembly in real time to form a position closed-loop control, improve the position accuracy of the lumbar support adjustment, and support functions such as position memory and stroke limit.

[0054] In a specific embodiment, the control assembly further includes a manual control unit, which is signal-connected to the main control unit and is used for users to manually input adjustment commands to control the extension and retraction stroke of the drive component 2, as well as to switch between adaptive adjustment mode and manual locking mode; the manual adjustment mode has a higher priority than the adaptive adjustment mode.

[0055] The manual control unit is an external terminal that users can directly operate. It is usually located in an easily accessible position, such as the side of the sofa armrest, and can establish a signal connection with the main control unit via wired or wireless means. As mentioned above, users can directly input adjustment commands through the manual control unit to control the extension and retraction of the drive component 2 and adjust the lumbar support's thrust. Simultaneously, users can freely switch between adaptive adjustment mode and manual locking mode via the manual control unit. When switched to manual locking mode, the lumbar support is fixed at the current thrust position and will not automatically adjust with changes in sitting posture. Setting the manual adjustment mode to have higher priority than the adaptive adjustment mode ensures that the user's manual operation commands can directly override the automatic adjustment state, meeting the user's need for autonomous control.

[0056] The complete working process of the lumbar support device provided in this embodiment is divided into two scenarios: manual adjustment mode and adaptive adjustment mode. Manual adjustment mode: The user operates the manual control unit to issue an adjustment command. After the command is transmitted to the main control unit, the main control unit outputs a control signal to the motor unit 21. The motor unit 21 rotates, and the power is transmitted to the lead screw transmission group 222 after being reduced in speed and increased in torque by the reduction transmission group 221. The lead screw transmission group 222 drives the telescopic rod unit 23 to extend and retract axially. The telescopic rod unit 23 pushes the rocker arm body 31 to swing around the pivot hinge end 33. The support output end 34 of the rocker arm body 31 drives the transverse support member to reciprocate along an arc-shaped trajectory that protrudes forward from top to bottom. After adjusting to the target ejection position, it is locked. During the process, the position detection subunit built into the motor unit 21 collects the number of rotations in real time, converts it into telescopic rod displacement data, and feeds it back to the main control unit to form a position closed loop and ensure adjustment accuracy.

[0057] Adaptive Adjustment Mode: After the user activates adaptive mode, the main control unit first executes a self-learning calibration process, driving the motor unit 21 to complete the full stroke of the lateral support component. During the stroke, the flexible thin-film pressure sensor attached to the surface of the lateral support component collects lumbar pressure data in real time throughout the entire stroke. Combined with the synchronously collected displacement data, the main control unit calibrates and generates user-specific lumbar support baseline parameters. After calibration, the real-time adjustment stage begins: the pressure sensor continuously collects real-time lumbar pressure values, pressure distribution, pressure change rate, and bearing time data, transmitting them to the main control unit. The main control unit analyzes the data using a built-in deep learning algorithm model, identifies the user's leaning state and fatigue level, and determines whether the current support is appropriate based on the baseline parameters. Subsequently, it outputs adjustment commands to the motor unit 21 to dynamically adjust the extension of the lateral support component, achieving adaptive support that follows changes in sitting posture. The user can intervene in the adjustment at any time through the manual control unit. Manual commands have higher priority than automatic adjustments and can directly lock the position or switch modes.

[0058] Example 2 This embodiment provides a sofa, such as Figure 11 and Figure 12 As shown, it includes a sofa backrest frame and a lumbar support device as described in Embodiment 1, wherein the lumbar support device is embedded inside the sofa backrest frame.

[0059] The sofa backrest frame serves as the rigid load-bearing base, with the lumbar support device seamlessly embedded within the inner cavity of the frame. The backrest is then filled with sponge and covered with fabric, forming a complete upholstered structure. As described above, the lumbar support's support force is evenly transmitted to the user's lower back through the sponge and fabric, achieving adjustable lumbar support while retaining the soft feel of a traditional upholstered sofa. With no exposed adjustment components, the overall aesthetic of the sofa remains consistent.

[0060] Of course, the lumbar support device in Embodiment 1 can also be used on a bed.

[0061] Example 3 This embodiment provides a control method for a lumbar support device, applied to the lumbar support device described in Embodiment 1, including the following steps: receiving a lumbar support adjustment command, driving component 2 to perform a telescopic action; driving component 2 to drive rocker arm transmission component 3 to reciprocate around its hinge fulcrum with the lower part of support frame component 1; rocker arm transmission component 3 to drive push-out support component 4 to reciprocate along an arc-shaped trajectory from top to bottom and protruding forward, completing the push-out or retraction action of the lumbar support.

[0062] Specifically, this method is the basic control process for the lumbar support device, suitable for basic usage scenarios such as manual adjustment. After receiving the adjustment command from the user, the control assembly outputs a corresponding electrical signal to the drive component 2. The drive component 2 outputs linear power, which drives the push-out support component 4 to reciprocate along a preset arc trajectory through the lever transmission of the rocker arm transmission component 3, completing the push-out or retraction action. The adjustment process is smooth and stable.

[0063] In a specific embodiment, when the adaptive adjustment mode is enabled, the following steps of adaptive lumbar support control are also performed: Upon receiving the start command of the adaptive mode, self-learning calibration is performed, including: the drive component 2 drives the ejector support component 4 to complete the full stroke traverse, synchronously collecting lumbar pressure data and corresponding displacement data under the full stroke, and calibrating to generate user-specific lumbar support reference parameters; real-time collection of user lumbar support pressure data and displacement data of the ejector support component 4; calculation and analysis of real-time data based on lumbar support reference parameters to determine the current support status; and outputting adjustment commands according to the analysis results to control the drive component 2 to dynamically adjust the ejection amount, thereby achieving adaptive lumbar support.

[0064] Specifically, the adaptive adjustment mode is an optional advanced working mode that is only triggered upon receiving a start command and will not run automatically without conditions. Self-learning calibration is a prerequisite for adaptive adjustment. It collects user-specific pressure and displacement data through a full-stroke traversal to establish a personalized support benchmark. After calibration, it enters the real-time adjustment stage, continuously collecting data and dynamically adjusting the ejection amount to achieve automatic support adaptation that follows changes in the user's sitting posture.

[0065] In a specific embodiment, in the step of performing calculation and analysis on real-time data based on lumbar support reference parameters, a deep learning algorithm model is used to process real-time pressure data and displacement data, identify the user's leaning state and fatigue level, and dynamically match the optimal ejection stroke; the deep learning algorithm model can be continuously iteratively optimized based on the user's historical usage data.

[0066] By employing deep learning algorithms to process the data, the model can more accurately identify the user's leaning force, posture changes, and sedentary fatigue, outputting adjustment parameters that better suit the user's needs. Furthermore, the model can continuously iterate based on the user's historical usage data; the longer the usage time, the higher the accuracy and personalization of the adaptation.

[0067] In a specific embodiment, the control method further includes a manual control switching step: receiving a user's manual adjustment command, controlling the drive component 2 to adjust to the target top position and lock it, or switching to an adaptive adjustment mode.

[0068] Users can manually adjust the support at any time to lock in a comfortable position and avoid frequent changes caused by automatic adjustment; they can also switch back to adaptive adjustment mode according to their needs, balancing both autonomous control and intelligent adaptation.

[0069] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A lumbar support device, characterized in that, The device includes a support frame assembly, with a drive assembly hinged to the upper part of the support frame assembly and a rocker arm transmission assembly hinged to the lower part of the support frame assembly. The output end of the rocker arm transmission assembly is connected to an ejector support assembly, and the output end of the drive assembly is hinged to the rocker arm transmission assembly. The drive assembly can output a linear reciprocating driving force and drive the rocker arm transmission assembly to reciprocate around its hinge point with the support frame assembly, so that the ejector support assembly reciprocates along an arc-shaped trajectory that protrudes forward from top to bottom, thereby realizing the ejection and retraction of the waist support.

2. The lumbar support device according to claim 1, characterized in that, The drive assembly includes a motor unit, a transmission unit, and a telescopic rod unit. The motor unit is hinged to the upper part of the support frame assembly. The transmission unit is connected between the output end of the motor unit and the telescopic rod unit, and is used to convert the rotational motion of the motor unit into the linear reciprocating motion of the telescopic rod unit. The extended end of the telescopic rod unit is hinged to the rocker arm transmission assembly.

3. The lumbar support device according to claim 2, characterized in that, The transmission unit includes a reduction gear transmission group and a lead screw transmission group. The input end of the reduction gear transmission group is driven by the output shaft of the motor unit. The input end of the lead screw transmission group is driven by the output end of the reduction gear transmission group. The output end of the lead screw transmission group is connected to the telescopic rod unit and is used to drive the telescopic rod unit to perform linear telescopic motion along the axial direction.

4. The lumbar support device according to claim 1, characterized in that, The rocker arm transmission assembly includes a bent rocker arm body, which has a drive hinge end, a rotary hinge end, and a support output end. The rotary hinge end is hinged to the lower part of the support frame assembly, the drive hinge end is hinged to the output end of the drive assembly, and the support output end is fixedly connected to the ejector support assembly. The rotary hinge end, drive hinge end, and support output end are triangularly distributed to form a lever transmission structure.

5. The lumbar support device according to claim 1, characterized in that, The ejection support assembly includes a transverse support member that extends along the width direction of the support frame assembly and is connected to the output end of the rocker arm transmission assembly.

6. The lumbar support device according to claim 1, characterized in that, The lumbar support device also includes a control assembly, which is signal-connected to the drive component and is used to control the start / stop, forward / reverse rotation, and extension / retraction stroke of the drive component.

7. The lumbar support device according to claim 6, characterized in that, The control assembly includes a main control unit and at least one pressure sensing unit. The pressure sensing unit is fitted onto the outer surface of the push-out support component and is used to collect lumbar support pressure data in real time and transmit it to the main control unit. The main control unit is signal-connected to the drive component and is used to output control commands based on the received pressure data to adjust the extension stroke of the drive component and achieve adaptive lumbar support adjustment.

8. The lumbar support device according to claim 7, characterized in that, The pressure sensing unit is a flexible thin-film pressure sensor, used to collect real-time pressure values, pressure distribution areas, pressure change rates, and static pressure duration data of the user's waist.

9. The lumbar support device according to claim 7, characterized in that, The main control unit is configured to: drive the drive component to drive the ejection support component to complete the full stroke traverse, and calibrate and generate the corresponding user's lumbar support reference parameters based on the full stroke pressure data collected by the pressure sensing unit; Based on the lumbar support reference parameters and real-time pressure data, the system outputs adjustment commands to control the drive component to dynamically adjust the ejection amount.

10. The lumbar support device according to claim 9, characterized in that, The main control unit has a built-in deep learning algorithm model to identify the user's leaning state and fatigue level in order to match the ejection stroke; the deep learning algorithm model can continuously iterate and optimize the adaptation parameters based on the user's historical usage data.

11. The lumbar support device according to claim 3, characterized in that, The motor unit has a built-in position detection subunit. The position detection subunit collects the rotation number data of the motor unit through Hall detection or brushless FOC algorithm, and calculates the real-time displacement of the telescopic rod unit according to the lead parameter of the lead screw drive group, and feeds the displacement data back to the control assembly.

12. The lumbar support device according to claim 7, characterized in that, The control assembly also includes a manual control unit, which is signal-connected to the main control unit and is used for users to manually input adjustment commands to control the extension and retraction of the drive component, as well as to switch between adaptive adjustment mode and manual locking mode; the manual adjustment mode has a higher priority than the adaptive adjustment mode.

13. A sofa, characterized in that, It includes a sofa backrest frame and a lumbar support device as described in any one of claims 1 to 12, wherein the lumbar support device is embedded in the interior of the sofa backrest frame.

14. A control method for a lumbar support device, applied to the lumbar support device as described in any one of claims 1 to 12, characterized in that, Includes the following steps: Receive lumbar support adjustment commands and drive the components to perform extension and retraction actions; The drive assembly drives the rocker arm transmission assembly to reciprocate around the hinge point between it and the lower part of the support frame assembly. The rocker arm transmission assembly drives the push-out support assembly to reciprocate along an arc-shaped trajectory that extends from top to bottom and protrudes forward, completing the push-out or retraction action of the lumbar support.

15. The control method for the lumbar support device according to claim 14, characterized in that, When adaptive adjustment mode is enabled, the following steps of adaptive top-to-bottom control are also performed: Upon receiving the start command for adaptive mode, self-learning calibration is performed, including: The control drive component drives the ejection support component to complete the full stroke traverse, and simultaneously collects lumbar pressure data and corresponding displacement data under the full stroke, and calibrates and generates user-specific lumbar support reference parameters; Real-time data collection of user lumbar support pressure and displacement data of the push-out support components; The current support status is determined by analyzing real-time data based on the lumbar support baseline parameters. Based on the analysis results, adjustment commands are output to control the drive components to dynamically adjust the ejection amount, thereby achieving adaptive lumbar support.

16. The control method for the lumbar support device according to claim 15, characterized in that, In the step of performing calculations and analysis on real-time data based on lumbar support reference parameters, a deep learning algorithm model is used to process real-time pressure data and displacement data, identify the user's leaning state and fatigue level, and dynamically match the optimal ejection stroke; the deep learning algorithm model can be continuously iteratively optimized based on the user's historical usage data.

17. The control method for the lumbar support device according to claim 15, characterized in that, It also includes a manual control switching step: receiving the user's manual adjustment command, controlling the drive component to adjust to the target top position and lock it, or switching to the adaptive adjustment mode.

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