Chair for leisure and fitness and control method thereof
By combining a four-bar linkage and a stepless magnetically controlled damping component, the leisure fitness chair achieves multi-degree-of-freedom compound arc motion, solving the problems of existing chairs being unable to activate core muscle groups and having inaccurate resistance adjustment, and providing a comfortable, safe, and intelligent fitness experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNSHAN BEIJI PHOTOELECTRON SCI & TECH
- Filing Date
- 2026-01-07
- Publication Date
- 2026-04-21
AI Technical Summary
Existing office chairs or lounge chairs cannot effectively activate users' core muscle groups, lack ergonomic optimization in their movement trajectory, and may exacerbate lumbar spine pressure with long-term use. Furthermore, their resistance adjustment is inaccurate and cannot adapt to different usage scenarios.
It adopts a four-bar linkage to achieve multi-degree-of-freedom composite arc motion, combined with stepless magnetic control damping components and stepper motors, and realizes intelligent damping adjustment through thin-film pressure sensors and controllers, simulating the linkage between the hips and spine when the human body squats or stands up, and automatically adjusting resistance and motion balance.
It effectively reduces lumbar spine pressure, achieves intelligent and personalized adaptation, continuously exercises core muscle groups, provides stepless resistance adjustment, improves user comfort and safety, and avoids fatigue from prolonged sitting.
Smart Images
Figure CN121890838A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of chair technology, specifically a leisure and fitness chair and its control method. Background Technology
[0002] With the transformation of modern life and work styles, prolonged sitting has become the daily state for most people, resulting in increasingly prominent problems such as lower back pain, core muscle degeneration, and poor posture. Most office chairs or lounge chairs on the market are fixed or simple rocking designs. Although they can provide basic sitting posture support, they cannot effectively activate the user's core muscles during use and lack active fitness and health intervention functions. Current fitness chairs use an unstable seat to encourage users to engage their core muscles to maintain balance; however, in actual use, they have the following problems: the movement trajectory lacks ergonomic optimization, and long-term use may actually increase lumbar spine pressure and even cause discomfort; in addition, their resistance adjustment mostly relies on mechanical knobs or pneumatic devices, which cannot achieve precise, stepless and adaptive resistance control, and it is even more difficult to provide corresponding support according to different usage scenarios (such as relaxation, focus and training). Summary of the Invention
[0003] The purpose of this invention is to provide a chair for leisure and fitness, which has the effects of biomimetic movement and automatic adjustment and adaptation.
[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a leisure and fitness chair, including a base and a seat disposed thereon, wherein an anti-slip pad is fixedly provided at the bottom end of the base, and a rocker arm is provided between the base and the seat, forming two sets of four-bar linkages, wherein a connecting shaft one is fixedly provided at the top of the rocker arm, and a connecting shaft two is fixedly provided at the bottom of the rocker arm, wherein two mounting plates are fixedly provided at the top end of the base near the rear side, and a rotating shaft is rotatably provided between the two mounting plates, and the connecting shaft one is connected to the rotating shaft through a linkage component, wherein a stepless magnetically controlled damping component is provided on the surface of the rotating shaft.
[0005] A further provision of the present invention is that: two sets of lower hinge seats are fixedly provided at the top of the base, and two sets of upper hinge seats are fixedly provided at the bottom of the seat; the corresponding upper hinge seats are rotatably connected to the first connecting shaft, and the corresponding lower hinge seats are rotatably connected to the second connecting shaft.
[0006] A further configuration of the present invention is as follows: the linkage component includes a connecting rod, a connecting arm, and an eccentric wheel. The connecting rod is fixedly mounted on the surface of the second connecting shaft, and one end of the connecting rod is rotatably connected to one end of the connecting arm. The eccentric wheel is fixedly mounted on the surface of the rotating shaft, and the side of the eccentric wheel is rotatably connected to the other end of the connecting arm. When the seat undergoes multi-degree-of-freedom composite arc motion due to changes in the user's center of gravity, the second connecting shaft swings with the seat, driving the connecting arm through the connecting rod. The connecting arm then drives the eccentric wheel to rotate the rotating shaft, thereby converting the biomimetic arc motion of the seat into torque on the rotating shaft. This provides a continuous and stable rotational input for the stepless magnetic control damping component, ensuring that damping is generated in real time with the movement. The eccentric wheel structure generates a variable radius during motion transmission, amplifying the driving effect of small swings on the rotating shaft, improving damping response sensitivity, and absorbing some impact, reducing wear on the mechanism from rigid impacts. The entire linkage process involves only rods and rotating pairs, without complex transmission chains, making assembly simple, space-saving, and highly reliable. This effectively ensures that the chair maintains smooth and quiet damping feedback during long-term use, improving comfort and durability.
[0007] A further configuration of the present invention is as follows: the stepless magnetically controlled damping component includes a disk and two damping seats. The disk is fixedly installed in the middle of the rotating shaft. The disk is made of copper or aluminum, and a through hole is provided in the middle of the disk. The two damping seats are located on both sides of the disk, and multiple high-performance neodymium magnets are fixedly arranged on the opposite surfaces of the damping seats. This stepless magnetically controlled damping component uses a copper or aluminum disc fixed in the center of the rotating shaft as a conductor. High-performance neodymium magnets are arranged on the opposite surfaces of the damping seats on both sides, forming a constant magnetic field covering both sides of the disc. When the seat drives the rotating shaft to rotate, the disc cuts the magnetic field lines to generate eddy currents. The eddy currents interact with the magnetic field to generate resistance in the opposite direction of motion, achieving a purely mechanical contact damping effect without wear. This avoids the wear and noise of traditional friction plates, resulting in a long lifespan and low maintenance requirements. The high-performance neodymium magnets provide a high magnetic energy product, enabling a wide and continuous range of resistance within a small volume. Combined with the adjustment of the damping seat position, the magnetic field strength can be steplessly and precisely changed to meet the different resistance requirements of different modes such as leisure, focus, and training. The through hole in the center of the disc reduces the rotating mass, lowers inertia, and improves the response speed, allowing the damping change to be synchronized with the user's movements, enhancing the real-time adjustment experience. The overall structure is simple and compact, relying solely on the relative motion between the magnetic field and the conductor to generate resistance. No additional lubrication or sealing is required, ensuring stable and reliable operation and significantly improving the comfort, safety, and durability of the fitness chair.
[0008] A further configuration of the present invention is as follows: an adjustment seat is fixedly provided at the top of the damping seat; a bidirectional lead screw threadedly connected to the adjustment seat is rotatably provided at the top of the two mounting plates; a guide seat is fixedly provided at the bottom of the damping seat; a guide rod slidably connected to the guide seat is fixedly provided at the bottom of the two mounting plates; a motor frame is fixedly provided on one side of one of the mounting plates; a stepper motor is fixedly provided on one side of the motor frame; and the drive shaft of the stepper motor is fixedly connected to one end of the bidirectional lead screw.
[0009] A further feature of this invention is that: both ends of the rotating shaft are fixedly provided with mounting shafts penetrating the mounting plates; the ends of the mounting shafts are fixedly provided with mounting discs; and torsion springs are fixedly sleeved on the outside of the mounting shafts between the mounting discs and the corresponding mounting plates. This structure, with mounting shafts and torsion springs at both ends of the rotating shaft, allows the user to sit down, causing the seat to press down and rotate the rotating shaft, thus twisting and storing energy. When the user stands up, the torsion spring releases its elasticity to provide auxiliary torque, reducing the burden on the waist, abdomen, and legs, making it particularly beneficial for the elderly or those with weak core strength. The torsion springs are hidden between the mounting discs and mounting plates, rotating synchronously with the shaft without requiring additional space, resulting in a compact assembly and a simple appearance. The entire auxiliary force originates from mechanical elasticity, requiring no electrical control, and works in parallel with the stepless magnetic damping, maintaining freedom of movement while increasing safety, extending the lifespan of the damping components, and improving the chair's usability and reliability.
[0010] A further feature of this invention is that a grid-like thin-film pressure sensor is laid on the upper surface of the seat, and a controller is installed on the back of the seat. The thin-film pressure sensor and the stepper motor are electrically connected to the controller. The grid-like thin-film pressure sensor is in close contact with the upper surface of the seat, which can collect the pressure distribution of the buttocks and legs of the seated person at a high density and output electrical signals to the backrest controller in real time. The controller uses this information to determine the posture and immediately drive the stepper motor to adjust the damping, thereby realizing closed-loop intelligent control. The thin-film sensor is thin and flexible, which does not affect the seating comfort or change the appearance of the seat. It is connected to the controller and motor through simple wires, making the wiring concealed and reliable. The overall solution is low-cost and fast-responding, providing the chair with a seamless adaptive fitness and protection function.
[0011] A further provision of the present invention includes the following steps: S1: Real-time pressure distribution data of the user in different postures is collected by a thin-film pressure sensor installed on the seat; S2: The pressure data is transmitted to the controller on the back of the chair. The controller analyzes the pressure data to determine whether the user is leaning forward, leaning back, or standing upright. S3: Based on the analysis results, it automatically sends a control signal to the stepper motor, adjusts the bidirectional lead screw to drive the damping seat to move, thereby changing the damping magnitude of the stepless magnetic control damping component and realizing intelligent adjustment of the swaying amplitude and motion intensity.
[0012] A further provision of the present invention is that the controller triggers a protection mode when it determines that the user's pressure distribution is abnormal, including: When the user's center of gravity suddenly shifts, immediately increase the damping value to limit the swaying amplitude; When this control method is in operation, the thin-film pressure sensor collects pressure distribution data on the seat surface in real time and transmits it to the backrest controller. The controller analyzes the pressure data to determine whether the user is leaning forward, leaning back, or upright. Then, based on the analysis results, it sends a control signal to the stepper motor, which drives the damping seat to move through the bidirectional lead screw. This changes the gap between the magnet and the disk in the stepless magnetically controlled damping component, thereby adjusting the damping magnitude and realizing intelligent adjustment of the swaying amplitude and motion intensity. When the controller determines that the user's center of gravity has suddenly shifted, it immediately increases the damping value to limit the swaying amplitude. By increasing the resistance, it reduces seat shaking and provides protection.
[0013] When a user maintains a fixed posture for a long time, the damping value is periodically reduced to prompt the user to make slight movements and avoid fatigue from prolonged sitting.
[0014] A further feature of the present invention is that the controller establishes a personalized damping adjustment model based on historical pressure data and the user's exercise habits, and automatically calls the corresponding damping parameter configuration when the user uses it again, so as to achieve adaptive control and personalized fitness effects.
[0015] In summary, the present invention has the following beneficial effects: 1. Through a unique four-bar linkage mechanism, it performs multi-degree-of-freedom compound arc motion. This motion trajectory simulates the linkage curve between the hips and spine when a person squats or stands up naturally. It is highly ergonomic and can effectively reduce pressure on the lumbar spine, making the sitting experience more comfortable and healthy. 2. It can automatically and finely adjust the initial balance point and feedback intensity of the exercise according to the user's weight. Users can obtain the most suitable swaying feeling and support without any manual settings, realizing intelligent and personalized adaptation. 3. The stable surface forces the user's core muscles in the waist, abdomen, and back to be in a state of slight tension at all times to maintain body balance, thus achieving the goal of continuous core muscle training while sitting and effectively improving muscle degeneration caused by prolonged sitting. 4. High-performance neodymium magnets are used to generate damping. The gap between the magnet and the rotating disk is controlled by a precision motor to achieve stepless resistance adjustment with pure mechanical contact and no wear. It can provide resistance that changes continuously from minimum to maximum, providing a basis for various modes such as leisure and relaxation, focused work, endurance training and explosive power training. This chair uses a four-bar linkage mechanism to allow the seat to move slightly in multiple degrees of freedom along a squatting arc, reducing pressure on the lumbar spine. The connecting shaft drives the rotating shaft through the linkage rod, arm, and eccentric wheel. The copper disc in the shaft and the adjustable magnet seats on both sides form a contactless, stepless magnetic control damping. The stepper motor drives the bidirectional lead screw to change the gap in real time, and the resistance changes steplessly with the strength of the magnetic field. The torsion spring at the shaft end stores energy to assist in standing up. The mesh film pressure sensor sends the pressure distribution to the backrest controller in real time, and adjusts the resistance immediately according to the posture. In case of sudden deviation, the resistance is automatically increased to limit the rocking. The resistance is periodically reduced to prompt movement after sitting for a long time. It also calls on historical data to adaptively match the damping, realizing core exercise and intelligent protection in sitting posture. Attached Figure Description
[0016] Figure 1 This is one of the three-dimensional structural schematic diagrams of the present invention; Figure 2 This is the second three-dimensional structural schematic diagram of the present invention; Figure 3 This is the third three-dimensional structural schematic diagram of the present invention; Figure 4 This is a partial structural diagram of the present invention; Figure 5 This is a schematic diagram of the damping seat of the present invention; Figure 6 For the present invention Figure 4 A magnified structural diagram at point A.
[0017] In the diagram: 1. Base; 101. Lower hinge seat; 102. Anti-slip pad; 103. Rocker arm; 104. Connecting shaft one; 105. Connecting shaft two; 106. Connecting rod; 107. Connecting arm; 2. Mounting plate; 201. Rotating shaft; 202. Disc; 203. Eccentric wheel; 204. Mounting shaft; 205. Mounting plate; 206. Torsion spring; 207. Bidirectional lead screw; 208. Motor frame; 209. Stepper motor; 2010. Damping seat; 2011. High-performance neodymium magnet; 2012. Adjustment seat; 2013. Guide seat; 2014. Guide rod; 3. Seat; 301. Upper hinge seat; 302. Thin-film pressure sensor; 303. Controller. Detailed Implementation
[0018] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.
[0019] Please see Figures 1-6In this embodiment of the invention, a leisure and fitness chair includes a base 1 and a seat 3 disposed on the base 1. An anti-slip pad 102 is fixedly provided at the bottom end of the base 1. Two sets of four-bar linkages are formed between the base 1 and the seat 3, with rockers 103 positioned forward and backward. Initially, the rockers 103 are parallel. When a user sits down or applies force, the four-bar linkage allows the seat 3 to perform a multi-degree-of-freedom composite arc motion, not just a forward or backward or left-right rocking motion. This motion trajectory is biomimetic, simulating the linkage curve between the hips and spine when a person naturally squats or stands up, which is highly ergonomic, more lumbar-friendly, and can automatically adjust according to the user's weight. The initial balance point and feedback force of the exercise do not need to be manually set. The unstable plane forces the user's core muscles of waist, abdomen and back to be in a state of slight tension at all times to maintain balance, realizing true seated fitness. The top of the rocker arm 103 is fixedly equipped with a connecting shaft 104, and the bottom of the rocker arm 103 is fixedly equipped with a connecting shaft 205. The top of the base 1 is fixedly equipped with two mounting plates 2 near the rear side. A rotating shaft 201 is rotatably connected between the two mounting plates 2, and the connecting shaft 104 is connected to the rotating shaft 201 through a linkage component. The surface of the rotating shaft 201 is equipped with a stepless magnetic control damping component, which can precisely control the resistance and provide a basis for different fitness modes.
[0020] In this embodiment, preferably, the top of the base 1 is fixedly provided with two sets of lower hinge seats 101, and the bottom of the seat 3 is fixedly provided with two sets of upper hinge seats 301. The corresponding upper hinge seats 301 are rotatably connected to the connecting shaft 104, and the corresponding lower hinge seats 101 are rotatably connected to the connecting shaft 2 105. This guides the swing of the rocker arm 103, allowing the seat 3 to perform a multi-degree-of-freedom composite arc motion, rather than just swaying back and forth or left and right. In this embodiment, preferably, the linkage component includes a connecting rod 106, a connecting arm 107, and an eccentric wheel 203. The connecting rod 106 is fixedly mounted on the surface of the connecting shaft 105, and the end of the connecting rod 106 is rotatably connected to one end of the connecting arm 107. The eccentric wheel 203 is fixedly mounted on the surface of the rotating shaft 201, and the side of the eccentric wheel 203 is rotatably connected to the other end of the connecting arm 107. When the seat 3 performs a compound arc motion, it can drive the rotating shaft 201 to rotate. In this embodiment, preferably, the stepless magnetically controlled damping component includes a disk 202 and two damping seats 2010. The disk 202 is fixedly installed in the middle of the rotating shaft 201. The disk 202 is made of copper or aluminum, and the middle of the disk 202 is provided with a through hole so as not to interfere with the movement of the damping seats 2010 and the rotation of the rotating shaft 201. The two damping seats 2010 are located on both sides of the disk 202. Multiple high-performance neodymium magnets 2011 are fixedly arranged on the opposite surface of the damping seats 2010. When the disk 202 cuts magnetic field lines in the magnetic field under the drive of the rotating shaft 201, eddy currents are generated, thereby forming a resistance opposite to the direction of motion. In this embodiment, preferably, an adjusting seat 2012 is fixedly provided at the top of the damping seat 2010, and a bidirectional lead screw 207 threadedly connected to the adjusting seat 2012 is rotatably provided at the top of the two mounting plates 2. A guide seat 2013 is fixedly provided at the bottom of the damping seat 2010, and a guide rod 2014 slidably connected to the guide seat 2013 is fixedly provided at the bottom of the two mounting plates 2. A motor frame 208 is fixedly provided on one side of one of the mounting plates 2, and a stepper motor 209 is fixedly provided on one side of the motor frame 208. The drive shaft of the stepper motor 209 is fixedly connected to one end of the bidirectional lead screw 207. The drive shaft of the stepper motor 209 drives the bidirectional lead screw 207 to rotate, thereby driving the two damping seats 2010 to move towards each other, controlling the gap between the high-performance neodymium magnet 2011 and the disk 202. The smaller the gap, the stronger the magnetic field and the greater the resistance. The larger the gap, the smaller the resistance. This achieves a purely mechanical contact-type, wear-free stepless resistance adjustment. In this embodiment, preferably, both ends of the rotating shaft 201 are fixedly provided with mounting shafts 204 that pass through the mounting plate 2, and the ends of the mounting shafts 204 are fixedly provided with mounting discs 205. A torsion spring 206 sleeved on the outside of the mounting shaft 204 is fixedly provided between the mounting disc 205 and the corresponding mounting plate 2. When the user presses down on the seat 3, the torsion spring 206 is compressed and stores energy. When the user gets up, the torsion spring 206 releases energy and provides assistance in getting up, which is very friendly to the elderly or people with weak waist and abdominal strength. In this embodiment, preferably, a grid-like thin-film pressure sensor 302 is laid on the upper surface of the seat 3, and a controller 303 is provided on the back of the seat 3. The thin-film pressure sensor 302 and the stepper motor 209 are electrically connected to the controller 303. The thin-film pressure sensor 302 detects whether the user is seated, changes in the center of gravity of the sitting posture, and rough weight information. The controller 303 processes the data from the thin-film pressure sensor 302 and controls the rotation of the drive shaft of the stepper motor 209 according to a preset mode. In the relaxation mode, the damping is adjusted to the minimum, and the seat 3 sways naturally with the body for ultimate relaxation. In the focus mode, the damping is adjusted to the medium. The system provides a slight degree of "instability," requiring the core muscles to exert slight force to maintain stability, keep the mind alert, and improve work efficiency. In the endurance training mode of fitness mode, a medium to high damping is set, requiring the user to rhythmically shift their center of gravity forward and backward or left and right, similar to slowly rowing on a rowing machine, to train core endurance. In the strength training mode, the maximum damping is set, requiring the user to explosively shake the seat 3 to achieve an explosive training effect similar to an ab wheel or squat. In smart mode, the thin-film pressure sensor 302 detects that the user has been sitting still for a long time, automatically and slightly increases the damping and guides the seat 3 to make a few small swaying movements to remind the user to move their body.
[0021] In this embodiment, preferably, the following steps are included: S1: The pressure distribution data of the user in different postures is collected in real time by the thin film pressure sensor (302) installed on the seat (3); S2: The pressure data is transmitted to the controller (303) on the back of the chair. The controller analyzes the pressure data and determines whether the user is leaning forward, leaning back or standing upright. S3: Based on the analysis results, a control signal is automatically sent to the stepper motor (209) to adjust the bidirectional lead screw (207) to drive the damping seat (2010) to move, thereby changing the damping magnitude of the stepless magnetic control damping component and realizing intelligent adjustment of the shaking amplitude and motion intensity.
[0022] In this embodiment, preferably, the controller (303) triggers a protection mode when it determines that the user's pressure distribution is abnormal, including: When the user's center of gravity suddenly shifts, immediately increase the damping value to limit the swaying amplitude; When this control method is in operation, the thin-film pressure sensor collects pressure distribution data on the seat surface in real time and transmits it to the backrest controller. The controller analyzes the pressure data to determine whether the user is leaning forward, leaning back, or upright. Then, based on the analysis results, it sends a control signal to the stepper motor, which drives the damping seat to move through the bidirectional lead screw. This changes the gap between the magnet and the disk in the stepless magnetically controlled damping component, thereby adjusting the damping magnitude and realizing intelligent adjustment of the swaying amplitude and motion intensity. When the controller determines that the user's center of gravity has suddenly shifted, it immediately increases the damping value to limit the swaying amplitude. By increasing the resistance, it reduces seat shaking and provides protection.
[0023] When a user maintains a fixed posture for a long time, the damping value is periodically reduced to prompt the user to make slight movements and avoid fatigue from prolonged sitting.
[0024] In this embodiment, preferably, the controller (303) establishes a personalized damping adjustment model based on historical pressure data and user exercise habits, and automatically calls the corresponding damping parameter configuration when the user uses it again, so as to achieve adaptive control and personalized fitness effect.
[0025] In use, when a user sits on seat 3, their weight exerts a downward force, which is transmitted through the upper hinge seat 301 at the bottom of seat 3 to the connecting shaft 104, and then acts on rocker arm 103. The bottom of rocker arm 103 is connected to the lower hinge seat 101 on base 1 through connecting shaft 2 105. Since the rocker arms 103 are parallel to each other in the initial state, together with base 1 and seat 3, they form two sets of four-bar linkages. When the user sits down or changes their center of gravity, the mechanism does not simply swing in one direction, but allows seat 3 to perform a multi-degree-of-freedom composite arc movement. This movement trajectory is biomimetic, simulating the linkage curve of the hips and spine when the human body squats or stands up naturally, thus being more friendly to the lumbar spine. During the movement, connecting rod 106 fixed to the surface of connecting shaft 2 105 swings accordingly, thereby driving one end of connecting arm 107. The other end of the connecting arm 107 is rotatably connected to the eccentric wheel 203 fixed on the rotating shaft 201. Therefore, the compound motion of the seat 3 is ultimately converted into the rotational motion of the rotating shaft 201. A copper or aluminum disc 202 is fixedly installed in the middle of the rotating shaft 201. Two damping seats 2010 are provided on both sides of the disc 202. Multiple high-performance neodymium magnets 2011 are mounted on their opposite surfaces. When the disc 202 rotates with the rotating shaft 201 in the magnetic field generated by the damping seats 2010, it cuts the magnetic field lines and generates eddy currents, thereby forming resistance in the opposite direction of motion, realizing magnetically controlled damping without mechanical friction. The magnitude of the resistance is achieved by adjusting the gap between the two damping seats 2010 and the disc 202. The controller 303 detects the resistance based on the pressure of the diaphragm pressure sensor 302. The system receives information about the user's weight, seating position, and center of gravity changes, and sends commands to the stepper motor 209. The stepper motor 209 drives the bidirectional lead screw 207 to rotate, causing the two damping seats 2010 to move towards each other along the guide rod 2014. The smaller the gap, the stronger the magnetic field and the greater the resistance; conversely, the larger the gap, the smaller the resistance. This achieves precise and stepless resistance adjustment, allowing the chair to automatically fine-tune its initial balance point according to the user's weight and adapt to various modes such as relaxation, focus, endurance training, strength training, and intelligent reminders. In addition, torsion springs 206 are fitted on the mounting shafts 204 at both ends of the rotating shaft 201. When the user presses down on the seat 3, the torsion springs 206 are compressed and store energy; when the user stands up, the torsion springs 206 release energy, providing assistance in standing up, which is especially helpful for users with weaker lower back and abdominal strength.
[0026] This recreational fitness chair achieves multi-degree-of-freedom compound arc motion of the seat through a four-bar linkage mechanism. The motion trajectory simulates the linkage curve of the hips and spine when the human body naturally squats or stands up, conforming to ergonomics and reducing pressure on the lumbar spine. The lower hinge seat on the base and the upper hinge seat at the bottom of the seat are rotatably connected by connecting shaft one and connecting shaft two. Connecting shaft two drives the rotating shaft to rotate through a linkage component, which consists of a connecting rod, a connecting arm, and an eccentric wheel. The connecting rod is fixed to connecting shaft two, and the two ends of the connecting arm are respectively connected to the connecting rod and the eccentric wheel. The system features a moving connection, with an eccentric wheel fixed to a rotating shaft, causing the shaft to rotate when the seat moves. A copper or aluminum disc is fixed in the center of the rotating shaft, with damping seats on both sides. High-performance neodymium magnets are arranged on opposite faces of the damping seats. The damping seats are threadedly connected to a bidirectional lead screw via an adjusting seat. The bidirectional lead screw is driven by a stepper motor, and a guide rod is slidably connected to a guide seat at the bottom of the damping seat. The stepper motor drives the bidirectional lead screw to rotate, causing the two damping seats to move towards or away from each other, changing the gap between the magnets and the disc. This achieves contactless, wear-free, stepless magnetically controlled damping adjustment; the smaller the gap... The stronger the magnetic field, the greater the resistance. A rotating shaft with shafts at both ends passes through a mounting plate and is fitted with torsion springs. The torsion springs store energy between the mounting plate and the mounting disc. When the user presses down, the torsion springs compress; when standing up, the torsion springs release energy to assist in standing. A grid-like thin-film pressure sensor is installed on the upper surface of the seat to collect real-time pressure distribution data from the user. The backrest controller receives the data and analyzes the user's posture, sending a control signal to the stepper motor to adjust the damping, achieving intelligent adjustment of the swaying amplitude and exercise intensity. When a sudden shift in the center of gravity is detected, the damping is immediately increased to limit swaying. When a fixed posture is maintained for a long time, the damping is periodically reduced to prompt movement. The controller also establishes a personalized damping model based on historical data, automatically calling the corresponding parameters for adaptive control upon reuse. This structure provides a comfortable sitting experience through a biomimetic motion trajectory, continuous slight tension in the core muscles for seated exercise, and continuously adjustable resistance with stepless magnetic control to adapt to various modes such as leisure, focus, and training. The torsion spring assist in standing up is beneficial for those with weak abdominal and back muscles. The thin-film pressure sensor and controller work together to achieve intelligent protection and personalized fitness.
[0027] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.
Claims
1. A leisure and fitness chair, comprising a base (1) and a seat (3) disposed thereon, wherein an anti-slip pad (102) is fixedly provided at the bottom end of the base (1), characterized in that, The base (1) and the seat (3) are provided with rocker arms (103) arranged in front and behind, forming two sets of four-bar linkages. The top of the rocker arm (103) is fixedly provided with a connecting shaft one (104), and the bottom of the rocker arm (103) is fixedly provided with a connecting shaft two (105). The top of the base (1) is fixedly provided with two mounting plates (2) near the rear side. A rotating shaft (201) is rotatably provided between the two mounting plates (2). The connecting shaft one (104) is connected to the rotating shaft (201) through a linkage component. The surface of the rotating shaft (201) is provided with a stepless magnetic control damping component.
2. The chair for leisure and fitness according to claim 1, characterized in that: The top of the base (1) is fixedly provided with two sets of lower hinge seats (101), and the bottom of the seat (3) is fixedly provided with two sets of upper hinge seats (301). The corresponding upper hinge seats (301) are rotatably connected to the first connecting shaft (104), and the corresponding lower hinge seats (101) are rotatably connected to the second connecting shaft (105).
3. The chair for leisure and fitness according to claim 2, characterized in that: The linkage component includes a connecting rod (106), a connecting arm (107), and an eccentric wheel (203). The connecting rod (106) is fixedly mounted on the surface of the connecting shaft (105). The end of the connecting rod (106) is rotatably connected to one end of the connecting arm (107). The eccentric wheel (203) is fixedly mounted on the surface of the rotating shaft (201). The side of the eccentric wheel (203) is rotatably connected to the other end of the connecting arm (107).
4. The chair for leisure and fitness according to claim 1, characterized in that: The stepless magnetically controlled damping component includes a disk (202) and two damping seats (2010). The disk (202) is fixedly installed in the middle of the rotating shaft (201). The disk (202) is made of copper or aluminum, and a through hole is provided in the middle of the disk (202). The two damping seats (2010) are located on both sides of the disk (202). Multiple high-performance neodymium magnets (2011) are fixedly arranged on the opposite surface of the damping seats (2010).
5. The leisure and fitness chair according to claim 4, characterized in that: The damping seat (2010) is fixedly provided with an adjustment seat (2012) at its top end. The top of the two mounting plates (2) is rotatably provided with a bidirectional lead screw (207) threadedly connected to the adjustment seat (2012). The bottom end of the damping seat (2010) is fixedly provided with a guide seat (2013). The bottom of the two mounting plates (2) is fixedly provided with a guide rod (2014) slidably connected to the guide seat (2013). A motor frame (208) is fixedly provided on one side of one of the mounting plates (2). A stepper motor (209) is fixedly provided on one side of the motor frame (208). The drive shaft of the stepper motor (209) is fixedly connected to one end of the bidirectional lead screw (207).
6. The chair for leisure and fitness according to claim 1, characterized in that: Both ends of the rotating shaft (201) are fixedly provided with mounting shafts (204) that pass through the mounting plate (2). The end of the mounting shaft (204) is fixedly provided with a mounting plate (205). A torsion spring (206) sleeved on the outside of the mounting shaft (204) is fixed between the mounting plate (205) and the corresponding mounting plate (2).
7. The chair for leisure and fitness according to claim 5, characterized in that: A mesh-like thin-film pressure sensor (302) is laid on the upper surface of the seat (3), and a controller (303) is provided on the back of the seat (3). The thin-film pressure sensor (302) and the stepper motor (209) are electrically connected to the controller (303).
8. A control method for a chair used for leisure and fitness, characterized in that, Includes the following steps: S1: The pressure distribution data of the user in different postures is collected in real time by the thin film pressure sensor (302) installed on the seat (3); S2: The pressure data is transmitted to the controller (303) on the back of the chair. The controller analyzes the pressure data and determines whether the user is leaning forward, leaning back or standing upright. S3: Based on the analysis results, a control signal is automatically sent to the stepper motor (209) to adjust the bidirectional lead screw (207) to drive the damping seat (2010) to move, thereby changing the damping magnitude of the stepless magnetic control damping component and realizing intelligent adjustment of the shaking amplitude and motion intensity.
9. The control method for a leisure and fitness chair according to claim 8, characterized in that, The controller (303) triggers a protection mode when it determines that the user's pressure distribution is abnormal, including: When the user's center of gravity suddenly shifts, immediately increase the damping value to limit the swaying amplitude; When a user maintains a fixed posture for a long time, the damping value is periodically reduced to prompt the user to make slight movements and avoid fatigue from prolonged sitting.
10. The control method for a leisure and fitness chair according to claim 8, characterized in that, The controller (303) establishes a personalized damping adjustment model based on historical pressure data and user exercise habits. When the user uses it again, it automatically calls the corresponding damping parameter configuration to achieve adaptive control and personalized fitness effects.