A type of seating that reduces poor posture

Abstract

The present application relates to the technical field of furniture, and discloses a sitting device for reducing bad sitting posture, which comprises a seat plate, supporting legs and arc-shaped legs. The sitting device is used by a user to sacrifice part of leg and back comfort, to maintain the subconscious muscle force of the human body in a sitting posture state, to ensure the realization of correct sitting posture, to effectively avoid the occurrence of bad sitting postures (such as leg stretching, waist collapse and body leaning forward) which are prone to cause symptoms such as humpback, scoliosis and intervertebral disc herniation, and is especially suitable for children and teenagers in the growth and development age stage who need to sit for a long time to study. In addition, in the normal sitting posture state of using the sitting device, the unconscious force of the legs and the core muscle group can also achieve the effect of micro-muscle training. When the user actively shakes the sitting device forward and backward in the sitting posture state, the muscle training intensity can be improved, the leg and core muscle group in the sitting posture state can be moved slowly, and the fatigue of sitting for a long time can be relieved.

Description

Technical Field

[0001] This invention relates to the field of furniture technology, and more specifically to a type of seating that reduces poor sitting posture. Background Technology

[0002] Seating furniture, primarily represented by stools, chairs, and sofas, serves as an auxiliary tool in people's daily work and study activities. It must be able to support part or all of the human body's weight. To better support weight and improve comfort, numerous optimizations have been made to the surface in contact with the human body to reduce pressure.

[0003] It is widely acknowledged that prolonged sitting is detrimental to health. The main reasons are: ① The pressure from the contact points between the body and the seat is transferred into the body, and prolonged sitting can lead to poor blood and meridian circulation, thus causing health problems; ② In a sitting position, the seat replaces the support function of the legs, changing the force structure of the body. At the same time, the desktop, armrests, and backrest further support the arms, elbows, and back, causing the upper body to be in a relatively relaxed state. Prolonged sitting can easily lead to crossing legs, hunching, scoliosis, and other problems.

[0004] To address these shortcomings, various new types of seating have been developed, such as kneeling chairs and double-leg chairs. Kneeling chairs transform sitting into kneeling, distributing the weight across the calves, knees, and hips, thus reducing the pressure from body weight. However, this causes the legs to be bent at a large angle, which can worsen blood circulation and increase the burden on the knees, potentially causing damage. Double-leg chairs are "inconvenient but tolerable." Maintaining balance requires the legs and core muscles, allowing the person sitting to keep their spine straight and consciously control their muscles. However, double-leg chairs have significant drawbacks: ① They are prone to tipping over when the center of gravity changes rapidly; ② When unoccupied, they cannot maintain a stable upright position and must be leaned against a table / wall or laid flat, posing a risk of tipping over and injuring people or damaging property. Summary of the Invention

[0005] In response to the aforementioned deficiencies in existing technologies, a seating device is provided that reduces poor sitting posture, effectively preventing the occurrence of poor sitting postures (such as crossing legs, slouching, and leaning forward) that easily lead to symptoms such as hunchback, scoliosis, and herniated discs. It is especially suitable for children and adolescents who need to sit for long periods of time for studying and are in the growth and development stage.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A type of seating that reduces poor sitting posture is characterized by comprising a seat, a support leg located at the bottom of the seat, and arc-shaped legs located at both ends of the bottom of the support leg. The arc-shaped legs are in contact with the ground, and the support leg is connected between the arc-shaped legs and the seat. The arc-shaped legs are divided into a central arc-shaped area and straight areas at the front and rear ends, with the straight areas tangent to the arc-shaped areas. When the seat is not in use, the center of gravity of the seat is lower than the center of the arc, and the center of gravity of the seat is located above the arc-shaped area. The user's lower leg height is measured as H1, and the height of the seat from the ground is set as H2, ensuring that H1 ≥ H2.

[0008] According to the above technical solution, it also includes a connecting beam, which is located between the two curved legs, inside the support legs, or between the curved legs and the support legs.

[0009] According to the above technical solution, the curved leg adopts a self-symmetrical structure, and the straight sections on the front and rear sides of the curved leg are symmetrical to each other; the curved area is self-symmetrical, and the center of the curved area and the center of gravity of the seat are both located on the plane where the center of symmetry of the curved leg is located.

[0010] According to the above technical solution, the support leg includes a vertical section, the top of which is fixed to the seat plate, and the bottom of which is fixed to the top of the arc-shaped leg; the vertical section of the support leg is X-shaped, herringbone-shaped, has multiple vertical parallel rods, or is an irregular structure in the same vertical plane.

[0011] According to the above technical solution, a horizontal section is also connected between the bottom of the seat plate and the vertical section. The horizontal section is fixed to the bottom of the seat plate, the vertical section is located on both sides of the horizontal section, and the top of the vertical section is fixed on the horizontal section.

[0012] According to the above technical solution, the seat plate includes a rigid plate body, and a cushion is provided on the rigid plate body; the upper surface of the cushion is flat, slightly curved, or designed as an irregular curved surface according to ergonomics.

[0013] According to the above technical solution, the cushion includes an inner layer and a wrapping layer, wherein the inner layer is made of sponge or latex, and the wrapping layer is made of cotton, linen, leather, or textiles.

[0014] According to the above technical solution, it also includes armrests, backrests, or armrests and backrests; the armrests, backrests, or armrests and backrests are fixedly connected to the support legs or seat board, or are integral with the seat board; when the user sits on the seat, the height of the armrests and backrests does not exceed the user's waist.

[0015] According to the above technical solution, the center height of the seat plate shall not be lower than the center height of the arc-shaped area.

[0016] The present invention has the following beneficial effects:

[0017] This seating system, while sacrificing some leg and back comfort, ensures correct posture through subconscious muscle engagement to maintain balance and stability while seated. It effectively prevents poor posture (such as crossing legs, slouching, and leaning forward) that can lead to hunchback, scoliosis, and herniated discs. It is especially suitable for children and adolescents who need to sit for long periods for studying and are in their growth and development stages. Furthermore, the unconscious engagement of the legs and core muscles while in a normal sitting position provides a micro-muscle training effect. Actively rocking the seat back and forth while seated further intensifies this muscle training, providing a relaxing workout for the legs and core muscles and relieving fatigue from prolonged sitting. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a basic embodiment provided by the present invention;

[0019] Figure 2 This is a schematic diagram of the arc-shaped leg provided in an embodiment of the present invention;

[0020] Figure 3 This is a structural diagram of a user sitting upright according to a basic embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the forward-tilting structure of the seat provided in the basic embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the seat tilting structure provided by the basic embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the center of gravity of the seat provided by the present invention being lower than the center of the arc-shaped legs when no one is sitting on it;

[0024] Figure 7 This is a schematic diagram showing that the center of gravity of the seat is higher than the center of the curved legs when someone is sitting in it, according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the first embodiment of the support leg transformation provided by the present invention;

[0026] Figure 9 This is a schematic diagram of the structure of the second embodiment of the support leg transformation provided by the present invention;

[0027] Figure 10 This is a schematic diagram of the third embodiment of the support leg transformation provided by the present invention;

[0028] Figure 11 This is a schematic diagram of the structure of the first embodiment of the present invention that adds armrests and backrests;

[0029] Figure 12This is a schematic diagram of the structure of the second embodiment of the present invention, which adds armrests and backrests;

[0030] Figure 13 This is a schematic diagram of the human body and seating coordinates provided in the basic embodiment of the present invention;

[0031] In the diagram, 1. Seat plate; 2. Support leg; 3. Curved leg; 3-1. Front straight section; 3-2. Curved section; 3-3. Rear straight section; 4. Connecting crossbeam; 5. Armrest and backrest. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Reference Figures 1 to 13 As shown, the present invention provides a seat that reduces poor sitting posture.

[0034] Example 1

[0035] like Figure 1-7 As shown, the seat includes a rigid material seat plate 1, support legs 2 located at the bottom of the seat plate, and curved legs 3 located at both ends of the bottom of the support legs. The curved legs are in contact with the ground, and the support legs connect the curved legs and the seat plate. The curved legs are divided into a central curved area and straight areas at the front and rear ends, with the straight areas tangent to the curved areas. When the seat is not in use, the curved area or the straight area is in contact with the ground. The center of gravity of the seat is lower than the center of the curved area, and the center of gravity of the seat is located above the curved area or the straight area. The user's lower leg height is measured as H1, and the height of the seat plate from the ground is set as H2, ensuring that H1 ≥ H2.

[0036] In this embodiment, given the user's lower leg length, H1≥H2 can be achieved by designing the dimensions (length, thickness, etc.) of the curved leg, support leg, and seat, and by fixing the three together (i.e., ensuring that the height between the seat and the ground is equivalent to the user's lower leg length, so that when the user sits on the seat, the lower leg hangs down naturally, the sole of the foot or shoe is fully in contact with the ground, and the thigh and lower leg form a near 90° angle that is most convenient for the leg to exert force). It can also be achieved by an adjustable and fixed structure of the dimensions of the curved leg, support leg, and seat, or by an adjustable and fixed structure of the connection position between the curved leg, support leg, and seat.

[0037] The center of gravity is located above the curved area of ​​the curved legs, a structure similar to that of a roly-poly toy. Because the height of the seat's center of gravity is lower than the height of the center of the curve, and the seat's center of gravity is located above the curved area, when the seat is unoccupied, the seat contacts the ground through the curved legs, and the curved legs and the ground form a straight line. Furthermore, based on its roly-poly-like structure, the seat can maintain its stability and will not tip over.

[0038] The center of gravity of the seat is located above the straight section of the curved legs. This structure is the same as that of common chairs and is a stable structure. The stability of the seat can be ensured simply by keeping the straight section of the curved legs in contact with the ground.

[0039] When someone is seated, the seat and the user are considered as a whole. The curved area of ​​the seat's legs contacts the ground, either as a line (corresponding to a square cross-section of the curved leg) or two points (corresponding to a circular or elliptical cross-section of the curved leg). In this seated posture, only the user's buttocks are in contact with the seat, their legs extend beyond the seat plate, their lower legs hang naturally, and their feet touch the ground. The center of gravity of the seat and the user as a whole is offset from the vertical plane where the seat's own center of gravity is located, naturally forming a multi-point support structure composed of the curved legs and the user's legs. At this time, the user's feet are in contact with the ground, and the legs exert force to introduce additional auxiliary support. By using the user's legs and core muscles to assist in balance, the overall support of the seat and the user is stable and prevents them from tipping over, ensuring a stable sitting posture.

[0040] In addition, when the seat is tilted forward or backward to a certain angle (regardless of whether a user is sitting on it), the straight section of the curved leg contacts the ground. The contact area between the seat and the ground is a single surface (corresponding to a square cross-section of the curved leg) or two parallel lines (corresponding to a circular or elliptical cross-section of the curved leg), which can form a stable support and effectively prevent the user from excessively tilting forward or backward due to the back-and-forth rocking of the seat while sitting, thereby preventing the user from tipping over. The straight section of the curved leg is used as a braking structure design to automatically prevent tipping over and ensure the user's personal safety.

[0041] Based on the above measures, this seating allows users to maintain correct posture by subconsciously engaging muscles to keep balance and stability while seated, sacrificing some leg and back comfort. This effectively avoids poor postures (such as crossing legs, slouching, and leaning forward) that can lead to hunchback, scoliosis, and herniated discs. It is especially suitable for children and adolescents who need to sit for long periods of time for studying and are in their growth and development stage. Furthermore, the unconscious engagement of the legs and core muscles while in a normal sitting position provides a micro-muscle training effect. Actively rocking the seat back and forth while seated further intensifies this muscle training, providing a relaxing workout for the legs and core muscles and relieving fatigue from prolonged sitting.

[0042] Since adjusting the center of gravity of components by their size, material, and shape is common knowledge in the prior art, the position of the center of gravity of the seat determined by the material, size, and radius of the curved legs of each component in this embodiment is prior art. However, the location of the center of gravity of this invention, the form of this invention, and the realization of specific effects formed during interaction with the user are not prior art.

[0043] exist Figure 6 In the illustrated embodiment, the curved legs and support legs of the seat are made of 30mm×30mm hollow aluminum profiles, and the seat plate is made of ABS+PC material. The corresponding height h1 of the seat's center of gravity from the ground is approximately 320mm, and the height h2 below the center of the curved area of ​​the curved legs is 495mm. The center of gravity and support point of the seat are on the same vertical line, and the seat is in a stable state. When the seat tilts forward or backward, the support point of the seat and the ground changes, the center of gravity rises, and the center of gravity and support point of the seat are no longer on the same vertical line. In the absence of any external force other than gravity, the force of gravity will pull the center of gravity down, causing the posture of the seat to change in the opposite direction of tilting, and finally pulling the seat back to a stable state of upright on the ground.

[0044] exist Figure 7 In the simulation, when the user is seated with both feet off the ground, the overall center of gravity height h3 of the seat and user is approximately 652mm, and the center of gravity is located off the vertical plane containing the center of gravity of the seat's curved legs. The position of the overall center of gravity causes the seat and user to tilt forward. When the contact point between the seat and the ground does not move beyond the curved area, the feet touch the ground, and a new support—leg support—is introduced. The total number of support points formed by the feet and the contact points between the seat and the ground exceeds three and is not in a straight line, forming a stable support structure. The seat and user then stop tilting forward and return to a stable state. The above is an approximate analysis based on the user being a rigid object in a seated position. In reality, the user's feet never leave the ground, and the stable support structure for the seat and user is established through adaptive adjustment when the buttocks contact the seat.

[0045] Example 2

[0046] The structure and principle of Embodiment 2 are similar to those of Embodiment 1, except that: in order to improve the structural strength of the seat, a connecting beam 4 is also included. The connecting beam is located between the two curved legs, inside the support legs, or between the curved legs and the support legs, thereby enhancing the rigidity of the seat and preventing deformation of the seat.

[0047] Example 3

[0048] The structure and principle of Embodiment 2 are similar to those of Embodiment 1, except that: preferably, the curved leg adopts a self-symmetrical structure, and the straight sections on the front and rear sides of the curved leg are symmetrical to each other; the curved area is self-symmetrical, and the center of the curved area and the center of gravity of the seat are both located on the plane of the center of symmetry of the curved leg.

[0049] Example 4

[0050] like Figure 8-10As shown, the structure and principle of Embodiment 4 are similar to those of Embodiments 1-2, except that a preferred structural form of the support leg is provided. The support leg includes a bottom vertical section, the top of which is fixed to the base plate, and the bottom of which is fixed to the top of the arc-shaped leg. As shown in the embodiment, the vertical section of the support leg can be X-shaped, herringbone-shaped, composed of multiple vertical parallel rods, or an irregular structure on the same plane.

[0051] Example 5

[0052] The structure and principle of Embodiment 5 are similar to those of Embodiment 4, except that an alternative preferred structural form for the support leg is provided. A horizontal section is also connected between the bottom of the seat plate and the vertical section. The horizontal section is fixed to the bottom of the seat plate, and the vertical section is located on both sides of the horizontal section, with the top of the vertical section fixed to the horizontal section.

[0053] Example 6

[0054] The structure and principle of Embodiment 6 are similar to those of Embodiments 1-3, except that: the seat plate includes a rigid plate body, on which a cushion is provided; the upper surface of the cushion is a planar surface, a slightly curved surface, or an irregular curved surface designed according to ergonomics.

[0055] The cushion includes an inner layer and a wrapping layer. The inner layer is made of sponge or latex, using these moderately firm materials to increase user comfort. The wrapping layer is made of cotton, linen, leather, or textiles, using these high-friction materials to reduce the possibility of the user slipping off the cushion.

[0056] Example 7

[0057] like Figure 11-12 As shown, the structure and principle of Embodiment 7 are similar to those of Embodiments 1-5, except that: other configurations are extended based on this structure, including armrests, backrests, or armrests and backrests 5; the armrests, backrests, or armrests and backrests are fixedly connected to the support legs or seat plate (welding or bolt connection or other detachable or non-detachable fixed connection methods are acceptable), or they are integrated with the seat plate; when the user sits on this seat, the height of the armrests and backrests does not exceed the user's waist.

[0058] In this embodiment, the structure consisting of a seat, armrests, and backrest better supports the user's buttocks and thighs, distributing the weight more evenly and improving comfort. It also effectively prevents the user's buttocks and thighs from slipping off the seat surface during use. When the user sits down or stands up, the armrests and backrest facilitate smooth and safe sitting and standing movements with the support of their hands. Furthermore, the height of the armrests and backrest does not exceed the user's lumbar region to ensure unsupported back support. With the legs and core muscles assisting in balance, the back muscles naturally engage to keep the spine straight, thus correcting posture and preventing poor posture. The addition of armrests and backrest does not disrupt the overall mass distribution characteristics of the seat, ensuring that "when no one is sitting (when the seat is not in use), the seat's center of gravity is lower than the height of the center of the curved leg area."

[0059] The working principle of this invention is as follows: Figure 13 As shown:

[0060] 1. Treat the human body and the seating as two separate units. Obtain the coordinates of their respective centers of gravity in the same coordinate system. Calculate the final center of gravity coordinates of the human body and seating as a whole using the center of gravity formula. Establish a Cartesian coordinate system with the center of the arc corresponding to the curved leg of the seating in an upright position as the origin, and the direction parallel to the ground as the X-axis and the direction perpendicular to the ground as the Y-axis. Therefore, the center of the arc corresponding to the curved leg is (0,0).

[0061] 2. In the upright position, the coordinates of the center point of the upper surface of the seat are defined as (Fx, Fy), where Fx = 0, Fy > 0 or Fy ≤ 0, and Fy < 0 in the figure.

[0062] 3. When the human body is in a sitting position, the body as a whole has its center of gravity (Rx, Ry) located near the buttocks. Ry > Fy.

[0063] 4. When the seat is unloaded, its center of gravity coordinates (Zx, Zy) fall directly below the center of the arc corresponding to the curved leg. That is, Zx = 0, Zy < 0.

[0064] 5. On the curved leg, the coordinates of the connection point between the curved area and the straight area are (Ax, Ay) and (Bx, By), respectively, where Ax < Bx and Ay = By.

[0065] 6. Assuming the weight of the human body is M and the weight of the seat is N, the coordinates (Gx, Gy) of the center of gravity of the human body and seat as a whole are calculated as follows: Gx = (M × Rx + N × Zx) / (M + N), Gy = (M × Ry + N × Zy) / (M + N)

[0066] 7. Evaluation criteria for stability in a seated posture:

[0067] ① The relative positional relationship between (Gx, Gy) and coordinates (Ax, Ay) and (Bx, By);

[0068] ② The relative positional relationship between (Gx, Gy) and the center coordinates (0, 0).

[0069] When Gx < Ax or Gx > Bx, the overall center of gravity exceeds the arc-shaped area, causing the seat to tilt forward or backward until the straight area of ​​the arc-shaped legs contacts the ground and stops.

[0070] When Ax≤Gx≤Bx, the overall center of gravity falls above the arc area. If Gy>0, the human body + seat is in an unstable state and requires the waist and legs to exert force to support the ground to maintain stability. If Gy≤0, the human body + seat is in a stable state (assuming the human body is a rigid body).

[0071] Considering the overall balance of the human body and seating in a real-world situation:

[0072] (1) Whether standing or sitting, the human body is in a state of constant motion. Every part of the body has subtle movements, so the position of the center of gravity of the human body is constantly changing. The amplitude, frequency and direction of the change are determined by the movement of every part of the human body.

[0073] (2) The human body is not a rigid physical body. The connection between the various parts of the human body is flexible, and the connection between the human body as a whole and the seating is also flexible.

[0074] Therefore, if Gy≤0, considering ① the person's feet are in contact with the ground, ② the upper part of the body sways slightly back and forth or left and right, and ③ the body and the seat are not rigidly connected, then both Gx and Gy are in a process of rapid change. Before the body and the seat can regain balance through the back and forth swing of the seat, the body has already achieved rapid self-adjustment through the subconscious exertion of the waist and legs.

[0075] (3) To improve the posture correction effect of this seat, in the above coordinate system, Fy < 0. To increase the overall instability of the human body and the seat in a sitting posture, the position of the seat plate can be raised, that is, Fy approaches 0, or even Fy > 0. Then the coordinate of the human body's own center of gravity Ry will also increase, and the coordinate of the overall center of gravity of the human body and the seat Gy will also increase accordingly. Under the premise of fixed seat shape and size, the larger Gy is, the more serious the instability of the human body and the seat in a sitting posture, and the greater the burden on the human body to achieve balance through subconscious effort.

[0076] The above design assumes that changes in the seat position do not affect the self-balance of the seat when no one is sitting on it. The self-balance of the seat when no one is sitting on it is determined by the material and size of each component and the radius of the curved legs. The criteria for this are Zy < 0 and Ax < Zx < Bx. That is, the height of the seat's center of gravity is not higher than the height of the center of the curved area, and the center of gravity of the seat is located directly above the curved area.

[0077] The core of this invention is to utilize the human body's ability to spontaneously maintain balance. When sitting on a traditional stable seat (such as a four-legged chair), a person only needs to exert a small amount of force to balance the subtle movements of their own body to achieve a relatively stable state. However, sitting too stably and comfortably can lead to poor posture. When sitting on the unstable seat described in this invention, the human body needs to exert force through the limbs to balance the imbalance caused by the subtle movements of the body and the unstable seat. The comfort of the sitting posture decreases, and the body will subconsciously adjust itself to avoid poor posture, while also achieving the purpose of moderate exercise for local limbs.

[0078] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A seat for reducing bad posture, characterized by: The seat comprises a seat plate, support legs at the bottom of the seat plate, and arc-shaped legs at the bottom of the support legs, the arc-shaped legs being in contact with the ground, and the support legs being connected between the arc-shaped legs and the seat plate; the arc-shaped legs are divided into an arc-shaped area in the middle and linear areas at the front and back ends, the linear areas being tangent to the arc-shaped area; when the seat is not occupied, the center of gravity of the seat is lower than the center of the arc-shaped area, and the center of gravity of the seat is above the arc-shaped area; the height of the user's lower leg is H1, and the height of the seat plate from the ground is H2, and H1 is greater than or equal to H2; When the user sits on the seat, the lower leg naturally droops, the soles or the soles of the shoes are in full contact with the ground, and the angle between the upper leg and the lower leg is close to 90 degrees, which is the most convenient angle for leg force; When the seat is tilted forward or backward to a certain angle, the linear areas of the arc-shaped legs are in contact with the ground, forming a stable support, effectively resisting the tendency of excessive forward or backward tilting caused by the user's rocking the seat in a sitting position, and preventing the user from falling over.

2. A chair to reduce bad posture according to claim 1, characterized in that: The seat further comprises a connecting beam arranged between the arc-shaped legs, between the support legs, or between the arc-shaped legs and the support legs.

3. The sitter of claim 1, wherein: The arc-shaped legs adopt a self-symmetrical structure, the linear areas on the front and back sides of the arc-shaped legs are mutually symmetrical, and the arc-shaped area is self-symmetrical, the center of the arc-shaped area and the center of gravity of the seat being located on the plane of the center of symmetry of the arc-shaped legs.

4. A chair to reduce bad posture according to any one of claims 1-2, characterized in that: The support legs comprise a vertical segment, the top of the vertical segment being fixed to the seat plate, and the bottom of the vertical segment being fixed to the top of the arc-shaped leg; the vertical segment of the support leg is in the shape of X, a herringbone, a plurality of vertical parallel rods, or a special-shaped structure in the same vertical plane.

5. A chair to reduce bad posture according to claim 4, characterized in that: A horizontal segment is further connected between the bottom of the seat plate and the vertical segment, the horizontal segment being fixed to the bottom of the seat plate, the vertical segment being located on both sides of the horizontal segment, and the top of the vertical segment being fixed to the horizontal segment.

6. A chair to reduce bad posture according to any one of claims 1-3, characterized in that: The seat plate comprises a rigid plate body, and a cushion is arranged on the rigid plate body; the upper surface of the cushion is in the shape of a plane, a micro-arc surface, or an irregular curved surface designed in accordance with human engineering.

7. A chair to reduce bad posture according to claim 6, characterized in that: The cushion comprises an inner layer and a wrapping layer, the material of the inner layer being sponge or latex, and the material of the wrapping layer being cotton, hemp, leather, or textiles.

8. A chair to reduce bad posture according to any one of claims 1-3, characterized in that: The seat further comprises an armrest, a backrest, or an armrest and a backrest; the armrest, the backrest, or the armrest and the backrest are fixedly connected to the support legs or the seat plate, or are integrated with the seat plate; when the user sits on the seat, the height of the armrest and the backrest does not exceed the waist of the user.

9. A chair to reduce bad posture according to any one of claims 1-3, characterized in that: The center height of the seat plate is not lower than the center height of the arc-shaped area.

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