Bionic curved surface seat structure and carrier applying same

Abstract

The invention discloses a bionic curved surface seat structure and a carrier applying the same, and relates to the technical field of medical instruments, the bionic curved surface seat structure comprises a seat cushion and a backrest, the seat cushion and the backrest are connected in a curved surface transition mode, and the seat cushion and the backrest are both formed by connecting a plurality of curved surfaces with different curvature radiuses in a smooth transition mode; a bearing part is arranged in the middle of the cushion and corresponds to buttocks and thighs of a human body, and the edge of the bearing part is in curved surface transition connection with the upper surface of the cushion; a back supporting part is arranged in the middle of the backrest and corresponds to the lumbar vertebra and the thoracic vertebra of the human body, and the edge of the back supporting part is in curved surface transition connection with the upper surface of the cushion. A bearing part and a back supporting part are convexly arranged on the cushion and the backrest corresponding to each part of a human body respectively. The combination of the curved surfaces with different curvature radiuses can fit the physiological curve of the human body, so that the human body is in full contact with the surface of the seat, the bearing part and the back supporting part can disperse the pressure borne by the human body part, the sitting posture is more natural, and the problem that the human body is unhealthy due to non-uniform pressure distribution is solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a biomimetic curved seat structure and a vehicle using the structure. Background Technology

[0002] The seat cushions and backrests of conventional chairs often feature simple flat or single-curved surfaces, resulting in a relatively fixed overall structure that fails to adequately adapt to and optimize the physiological curves of the human body during sitting. Because the curved surface design of these seats and backrests lacks precise consideration of the human body's contours, the body cannot achieve full and close contact with the surface, leading to uneven pressure distribution and excessive stress in certain areas. Prolonged exposure to this poorly fitted and unbalanced seating position can easily cause postural fatigue, muscle soreness, and poor blood circulation, and may also increase the risk of pressure sores, scoliosis, and other posture-related health problems. Even if some chairs use cushioning materials, the unreasonable basic curved surface design of the seat cushion and backrest makes it difficult to fully utilize the material's pressure distribution and cushioning effects, failing to effectively meet the user's needs for comfort and health protection during long-term sitting. Summary of the Invention

[0003] To improve the health protection performance of seats, this application provides a biomimetic curved seat structure and a vehicle using the structure.

[0004] The biomimetic curved seat structure provided in this application adopts the following technical solution: A biomimetic curved seat structure includes a seat cushion and a backrest, wherein the seat cushion and the backrest are integrally formed, and the connection between the seat cushion and the backrest adopts a curved transition. Both the seat cushion and the backrest are formed by multiple curved surfaces with different radii of curvature that are smoothly connected. The seat cushion has a support portion in the middle, which corresponds to the human buttocks and thighs. The support portion protrudes from the upper surface of the seat cushion, and the thickness of the support portion is fixed relative to the upper surface of the seat cushion. The edge of the support portion is connected to the curved surface of the upper surface of the seat cushion. The backrest has a back support portion in the middle, which corresponds to the human lumbar and thoracic vertebrae. The back support portion protrudes from the front surface of the backrest, and the thickness of the back support portion is fixed relative to the front surface of the backrest. The edge of the back support portion is connected to the curved surface of the upper surface of the seat cushion.

[0005] By adopting the above technical solution, the seat cushion and backrest are integrally molded and connected by a curved transition. Both the seat cushion and backrest are composed of multiple smoothly transitioning curved surfaces with different radii of curvature. The seat cushion has a support section in the center corresponding to the buttocks and thighs, while the backrest has a back support section in the center corresponding to the lumbar and thoracic vertebrae. Both the support and back support sections protrude from their respective surfaces and have a fixed thickness, with their edges seamlessly transitioning to the corresponding curved surfaces. This combination of curved surfaces with different radii of curvature precisely conforms to the physiological curves of the buttocks, thighs, lumbar vertebrae, and thoracic vertebrae, ensuring full contact between the body and the seat surface. The protruding structures of the support and back support sections can directionally distribute pressure on corresponding parts of the body, preventing excessive local pressure. The edge design of the curved transition reduces friction and squeezing sensation when the body contacts the seat, resulting in a more natural sitting posture. This reduces the risk of pressure sores, poor blood circulation, scoliosis, and other health problems caused by uneven pressure distribution.

[0006] Optionally, the support portion includes an ischial support area, which is located on the side of the support portion near the backrest. The ischial support area is provided corresponding to the ischial tuberosities on both sides of the human body, and the ischial support area is recessed in the horizontal direction relative to the middle of the support portion.

[0007] By adopting the above technical solution, the recessed design is adapted to the physiological protrusion of the ischial tuberosity, allowing the ischial tuberosity area to be embedded in the corresponding region. This avoids pressure concentration caused by direct pressure on the ischial tuberosity, effectively dispersing the vertical pressure on the ischial tuberosity area and reducing numbness and tingling in this area during prolonged sitting. At the same time, the recessed structure provides a natural positioning effect for the buttocks, preventing them from sliding forward, backward, or sideways during sitting and improving seating stability. The height difference between the ischial support area and the middle of the support part forms a natural support transition, further optimizing the overall force distribution of the buttocks, making the force on the buttocks more even, meeting the physiological support needs of the buttocks, and enhancing the biomimetic support effect of the seat.

[0008] Optionally, the support portion further includes a thigh support area, which is located on the side of the support portion away from the backrest. The thigh support area is positioned corresponding to the back of the human thigh and is raised and protruded in the horizontal direction relative to the center of the support portion.

[0009] By adopting the above technical solution, the raised protrusion structure can closely conform to the natural physiological curve of the back of the thigh, providing continuous and uniform upward support to the back of the thigh, reducing the downward pulling sensation caused by the unsupported back of the thigh, and reducing the fatigue load on the thigh muscles. This structure allows the back of the thigh to fully conform to the seat surface, dispersing local pressure on the thigh and preventing poor blood circulation caused by pressure on the groin. At the same time, the raised shape of the thigh support area and the sunken shape of the ischial tuberosity support area form a high-low connection, completely conforming to the continuous physiological curve of the human body from the buttocks to the back of the thigh, optimizing the force transmission path of the lower limbs, significantly improving the comfort of the lower limbs when sitting for a long time, and adapting to the natural posture of the thighs when sitting.

[0010] Optionally, the support portion has an extended support portion on the side away from the backrest, and the extended support portion is disposed on the left and right sides of the support portion and extends on the seat cushion along the side away from the backrest.

[0011] By adopting the above technical solution, the extended support is distributed on the left and right sides of the support and extends forward on the seat cushion in a direction away from the backrest. The extended support bends downwards corresponding to the back of the thigh, forming a smooth curved transition between the extended support and the support. This smooth curved transition conforms to the physiological extension trend of the thigh from the buttocks to the back of the knee, evenly transmitting and dispersing the pressure on the thigh along the extended curved surface, avoiding local pressure concentration on the thigh. The downward-curving structure effectively avoids the blood vessel distribution area in the back of the knee, preventing the extended support from compressing the blood vessels in the back of the knee, ensuring smooth blood circulation in the back of the knee. At the same time, the smooth curved transition maintains the continuity of the seat cushion surface, improves the fit between the thigh and the seat cushion, optimizes the force distribution on the thigh, relieves muscle tension, and improves riding comfort and health.

[0012] Optionally, the support portion has transition zones on the left and right sides, the transition zones are set corresponding to the human pelvis and the root of the thigh, the transition zones are raised from the ischium support zone toward the thigh support zone, and the transition zones are raised away from the center of the support portion.

[0013] By adopting the above technical solution, the bidirectional lifting transition zone structure can accurately adapt to the three-dimensional physiological protrusion of the human pelvis and the root of the thigh, providing all-round support for this area and avoiding compression or suspension of the pelvis and root of the thigh due to lack of support. The lifting design from the ischium support area to the thigh support area achieves a smooth transition of force from the buttocks to the root of the thigh, optimizes the force distribution in the pelvic area, and reduces the pressure concentration in the pelvic area. The lifting design towards the outer side of the center of the support can wrap around the sides of the human pelvis, prevent the pelvis from shifting laterally when sitting, and maintain the stability of the sitting posture. At the same time, this structure conforms to the physiological connection shape of the human pelvis and the root of the thigh, further improving the biomimetic adaptability of the seat and reducing fatigue from prolonged sitting in this area.

[0014] Optionally, the front surface of the backrest is inclined backward from bottom to top.

[0015] By adopting the above technical solution, the tilted rearward curved shape matches the natural physiological curvature of the human spine from the lumbar to the thoracic vertebrae, allowing the human back to fully conform to the backrest surface, eliminating the gap between the back and the backrest, avoiding abnormal force caused by local unsupported areas on the back. The tilt angle conforms to the natural relaxed posture of the back when sitting, reducing passive bending of the spine and lowering the stress load on the joints of the spine. At the same time, the tilted rearward curved surface can evenly transmit the vertical pressure of the back to the entire backrest structure along the curved surface, improving the uniformity of back support and relieving tension in the back muscles. Furthermore, the tilted curved surface and the curved surface structure of the seat cushion form a continuous overall conforming surface, making the force transmission from the buttocks to the back smoother, comprehensively optimizing the biomimetic support effect of the seat, and improving back comfort during long-term sitting.

[0016] Optionally, the back support includes a lumbar support area located at the lower end of the back support, the lumbar support area being configured to correspond to the human lumbar spine, and the lumbar support area protruding forward relative to the middle of the back support in the vertical direction.

[0017] By adopting the above technical solution, the forward-protruding lumbar support area matches the physiological lordosis curve of the human lumbar spine, providing directional forward support to the lumbar region, filling the support gap between the lumbar spine and the backrest, preventing the lumbar spine from straightening due to unsupported position, reducing the stress on the intervertebral discs and surrounding ligaments, and relieving soreness and stiffness in the lumbar region during prolonged sitting. The protrusion height of the lumbar support area is adapted to the physiological curvature of the lumbar spine, allowing the lumbar spine to fit closely to the backrest, dispersing the tension of the muscles around the lumbar spine, and maintaining the natural physiological posture of the lumbar spine. At the same time, as the core support area of ​​the back support, the lumbar support area can guide the human back to naturally fit against the backrest, optimizing the overall force distribution of the back, providing continuous and stable bionic support for the lumbar spine, and reducing the risk of lumbar strain.

[0018] Optionally, the back support includes a chest and back area, which is located on the upper side of the back support and corresponds to the thoracic vertebrae of the human body. The chest and back area is recessed backward relative to the middle of the back support in the vertical direction.

[0019] By adopting the above technical solution, the position and curvature of the chest and back area precisely correspond to the physiological kyphosis of the thoracic spine, providing comprehensive and close support for the thoracic spine and chest and back muscles. This ensures full contact between the chest and back and the backrest surface, effectively dispersing vertical and lateral pressure on the chest and back, and preventing muscle fatigue caused by excessive local pressure. The chest and back area smoothly connects with the lower lumbar support area, forming a continuous support surface from the lumbar spine to the thoracic spine. This perfectly matches the overall physiological curvature of the human spine, helping to maintain the natural neutral posture of the spine and reducing compensatory tension in the chest and back muscles. Simultaneously, the concave structure allows for natural expansion and contraction of the chest and back during breathing, without restricting normal physiological activities. In addition to providing stable support for the chest and back, this further enhances the comfort of chest and back movement during seating, strengthening the overall integrity and biomimetic adaptability of the back support. Optionally, the backrest is provided with side wing areas, which are located on the left and right sides of the back support. The side wing areas are provided corresponding to the sides of the human shoulder blades and torso, and the side wing areas protrude towards the front of the backrest.

[0020] By adopting the above technical solution, the forward-protruding side wing area can conform to the physiological curves of the human shoulder blades and the sides of the torso, providing lateral wrapping and support for this area. This prevents the torso from shifting or sliding to the sides when sitting, improving the stability and safety of the ride. The protruding structure of the side wing area fills the gap between the sides of the torso and the backrest, avoiding uneven pressure caused by the suspension of this area, dispersing local pressure on the shoulder blades and the sides of the torso, and relieving muscle soreness and fatigue in this area. At the same time, the side wing area and the back support maintain a smooth transition, forming a three-dimensional back support curve, achieving all-round biomimetic fit to the center and sides of the back, making the force on the back more even, and further improving the comfort and wrapping feeling of the back when sitting for a long time.

[0021] Optionally, the back support is provided with extensions on the left and right sides at the center height of the chest and back area. The edges of the extensions are smoothly connected to the edges of the back support. The extensions extend away from the center of the chest and back area. The side wings are recessed towards the rear of the backrest corresponding to the position of the extensions.

[0022] By adopting the above technical solution, the extended design of the expansion section expands the support coverage of both sides of the chest and back area, adapts to the physiological extension shape of the chest and back sides of the human body, provides additional effective support for this area, and avoids insufficient support on both sides of the chest and back area. The smooth transition between the expansion section and the back support section maintains the curvature continuity of the backrest surface, improving the overall fit of the human chest and back. The rearward concave structure at the corresponding position of the side wing area can effectively avoid the movement space of the human scapula, and prevent the scapula from being squeezed and restricted by the backrest during movement. At the same time, the concave structure and the convex structure of the expansion section form a three-dimensional height match, conforming to the physiological curves of both sides of the chest and back, ensuring the support effect of the chest and back without affecting the slight movement of the human upper body, and improving the flexibility and comfort of sitting.

[0023] This application also discloses a vehicle including the aforementioned biomimetic curved seat structure, and a wheelchair assembly, wherein the wheelchair assembly is disposed at the bottom of the biomimetic curved seat structure, and the wheelchair assembly includes a front wheel assembly and a rear wheel assembly arranged in parallel.

[0024] By adopting the above technical solutions and applying the biomimetic curved seat structure, the vehicle possesses biomimetic support capabilities that conform to the physiological curves of the human body, providing users with a comfortable riding experience and reducing physical fatigue from prolonged sitting. The parallel arrangement of the front and rear wheel sets in the wheelchair assembly ensures the stability of the vehicle during travel, avoiding bumps or tilting caused by unbalanced wheel layout, thus improving driving safety. The cooperation between the front and rear wheel sets enables the vehicle to flexibly steer and travel in a straight line, adapting to the mobility needs of different indoor and outdoor scenarios. The combination of the biomimetic curved seat structure and the wheelchair assembly gives the vehicle the dual functions of comfortable riding and convenient mobility, meeting the riding and travel needs of people with mobility impairments. Long-term use of this vehicle by people with mobility impairments can reduce health problems caused by uneven force distribution.

[0025] Optionally, a mounting plate is connected to the bottom of the seat cushion, and armrests are mounted on opposite sides of the mounting plate, with the two armrests located on both sides of the backrest.

[0026] By adopting the above technical solution, the mounting plate provides a stable bottom support foundation for the seat cushion, improves the structural rigidity of the seat cushion, prevents local deformation of the seat cushion due to human body pressure, and ensures the stability of the overall structure of the seat. The armrests are fixed by the mounting plate, which can ensure the installation of the armrests and prevent the armrests from becoming loose or wobbly during use. The armrests are located on both sides of the backrest, which is adapted to the natural posture of the human arm when sitting, providing stable support for the arm and relieving the fatigue caused by the arm being suspended in the air. At the same time, the armrests can assist the human body in completing the action of getting on and off the seat, providing a benchmark for users who need to use the seat for assistance, and improving the convenience and safety of the seat.

[0027] Optionally, the handrail includes a fixed section and a movable section, wherein the movable section is rotatably hinged to the fixed section.

[0028] By adopting the above technical solution, the folding and retracting structure of the movable section through the rotating hinge can be completed to fit and retract into the fixed section when the armrest is not in use, reducing the overall space occupied by the armrest and realizing convenient storage of the armrest; after the movable section is completely folded up, it can eliminate the space occupied by the armrest around the seat, avoid the armrest components from obstructing or interfering with the space around the seat, ensure the integrity and unobstructedness of the space around the seat, and not affect the activity space around the seat and the spatial adaptability of the usage scenario due to the presence of the armrest.

[0029] Optionally, the rear wheel assembly has a drive assembly connected to its axle, and the armrest is equipped with an operating device that is electrically connected to the drive assembly.

[0030] By adopting the above technical solution, the drive component provides power output to the rear wheel assembly, realizing electric drive of the vehicle, replacing traditional manual push, greatly reducing the user's operating intensity. The operating device is set at the handrail position, which is within the convenient operating range of the user's hands when sitting, making it easy for the user to operate the drive component and realize the vehicle's starting, stopping, speed adjustment and steering functions.

[0031] Optionally, the wheelchair assembly includes a frame, the front wheel assembly and the rear wheel assembly are mounted on the frame, the frame is provided with a lifting assembly, the output end of the lifting assembly is connected to the bottom of the bionic curved seat structure, the lifting assembly drives the bionic curved seat structure to rise and fall, and the operating device is electrically connected to the lifting assembly.

[0032] By adopting the above technical solutions, the frame provides a stable mounting platform for the front wheel assembly, rear wheel assembly, and lifting assembly, improving the overall structural strength and load-bearing capacity of the wheelchair components. The lifting assembly can drive the bionic curved seat structure to adjust vertically, adapting to the seating height needs of users of different heights. It can also be matched with different heights of platforms, entrances, and other usage scenarios. The electrical connection between the operating device and the lifting assembly allows users to conveniently control the seat height through the operating device on the armrest. The adjustment process does not require external tools or large limb movements, improving the convenience of adjustment. The flexible adjustment of the seat height can optimize the user's sitting posture and expand the usage scenarios of the vehicle, improving the adaptability and practicality of the vehicle.

[0033] In summary, this application includes at least one of the following beneficial effects: 1. This application integrates the multi-curvature surface design of the seat cushion support and the backrest support. Through differentiated structures such as sinking, lifting, protrusion, and concavity, it precisely adapts to the physiological curves of the human buttocks, lower limbs, and spine, achieving all-round fit and support from the buttocks to the back. It can not only directionally distribute pressure in various parts and avoid excessive local pressure, but also maintain the natural neutral posture of the spine, effectively reducing the occurrence of pressure sores, poor blood circulation, scoliosis and other health problems related to prolonged sitting. Compared with traditional flat or simple curved seats, it improves biomimetic adaptability and health protection performance.

[0034] 2. The backrest features a recessed structure in the side wing area, extension section, and chest and back area. The side wing area protrudes forward to form a lateral wrapping, preventing torso shift. The extension section expands the lateral support range of the chest and back area, while the chest and back area is recessed backward to allow space for scapular movement. These three elements are smoothly transitioned to form a three-dimensional support structure. This not only solves the problem of traditional backrests providing only single-plane support and insufficient stability, but also avoids the drawback of excessive wrapping that restricts the movement of the upper body. It achieves a precise balance between support stability and body mobility, improving comfort and safety during long-term sitting.

[0035] 3. The armrest folding design allows for quick storage, eliminating obstruction of space around the seat. The lifting component allows for flexible adjustment of the seat height, and the drive component enables electric movement. All operations are completed through the operating device on the armrest. This not only solves the problems of traditional seat armrests occupying space and being inconvenient to adjust, but also achieves the integrated function of convenient storage and electric movement, adapting to users of different heights and different usage scenarios, especially meeting the travel and usage needs of people with mobility impairments. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of a biomimetic curved seat structure in an embodiment of this application.

[0037] Figure 2 This is a top view of a biomimetic curved seat structure in an embodiment of this application.

[0038] Figure 3 yes Figure 2 Sectional view along line AA in the diagram.

[0039] Figure 4 This is a side view of a biomimetic curved seat structure in an embodiment of this application.

[0040] Figure 5 yes Figure 4 BB line section view.

[0041] Figure 6 yes Figure 4 The CC line section view.

[0042] Figure 7 yes Figure 4 DD line section view.

[0043] Figure 8 This is a partial schematic diagram of a vehicle in an embodiment of this application.

[0044] Figure 9 This is a schematic diagram of the overall structure of a vehicle in an embodiment of this application.

[0045] Figure 10 This is a schematic diagram of the structure of a vehicle in an embodiment of this application.

[0046] Explanation of reference numerals in the attached figures: 1. Seat cushion; 11. Support section; 111. Ischial support area; 112. Thigh support area; 113. Extended support section; 12. Transition area; 2. Backrest; 21. Back support area; 211. Lumbar support area; 212. Chest and back area; 213. Side wing area; 214. Extension area; 3. Mounting plate; 31. Handrail; 311. Fixed section; 312. Moving section; 32. Operating device; 100. Wheelchair components; 101. Front wheel assembly; 102. Rear wheel assembly; 103. Drive assembly; 104. Frame; 105. Lifting assembly; 200. Bionic curved seat structure. Detailed Implementation

[0047] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0048] This application discloses a biomimetic curved seat structure. (Refer to...) Figures 1 to 3 The seat includes a seat cushion 1 and a backrest 2, which are integrally formed using a blow molding process. The connecting surface between the seat cushion 1 and the backrest 2 adopts a curved transition, and both the seat cushion 1 and the backrest 2 are smoothly connected by multiple curved surfaces with different radii of curvature. The blow molding process can improve the overall structural rigidity and stability of the seat, avoiding the problems of loosening and stiff connection of split structures. The curved transition connection and the multi-curvature surface combination design can adapt to the continuous physiological curve of the human body from the buttocks to the back, eliminate the gap between the body and the seat, distribute the force evenly, reduce the concentration of local pressure, and reduce the friction and squeezing sensation at the contact points, making the sitting posture more natural and providing a structural foundation for subsequent health protection.

[0049] The upper surface of the seat cushion 1 has a support portion 11 in the middle, which is positioned to correspond to the buttocks and thighs of the human body. The support portion 11 protrudes from the upper surface of the seat cushion 1, and its thickness is fixed relative to the upper surface of the seat cushion 1. The upper surface of the support portion 11 and the upper surface of the seat cushion 1 have the same curvature, and the edges of the support portion 11 transition smoothly with the curved surface of the upper surface of the seat cushion 1. The protruding structure of the support portion 11 provides support for the buttocks and thighs, conforming to the physiological contours of these areas and avoiding imbalance caused by insufficient support. The fixed thickness of the support portion 11, along with its consistent curvature and transitional edge surface, achieves a seamless connection between the support portion 11 and the surface of the seat cushion 1, reducing localized pressure, distributing pressure on the buttocks and thighs, alleviating fatigue from prolonged sitting, and improving seating comfort.

[0050] The backrest 2 has a back support portion 21 in the middle of its front surface. The back support portion 21 corresponds to the lumbar and thoracic vertebrae of the human body. The back support portion 21 protrudes from the front surface of the backrest 2, and its thickness is fixed relative to the front surface of the backrest 2. The front surface of the back support portion 21 and the front surface of the backrest 2 have the same curvature. The edge of the back support portion 21 transitions smoothly with the curved surface of the front surface of the backrest 2. The front surface of the backrest 2 slopes backward from bottom to top. Specifically, the angle α formed by the seat cushion 1 and the backrest 2 when viewed from the side is 100°. More preferably, the angle α is above 95° and below 110°. The protruding structure of the back support portion 21 precisely conforms to the physiological curves of the lumbar and thoracic vertebrae, providing targeted support, filling the gap between the back and the backrest 2, and avoiding stress concentration caused by localized unsupported areas. The fixed thickness and curvature matching design ensures support stability and fit, while the edge curved transition reduces back friction and compression. The reclining posture of the backrest 2 conforms to the natural curvature of the spine when sitting, reducing passive stress on the spine, maintaining a neutral spinal posture, reducing the risk of lumbar and thoracic strain, and improving the comfort of long-term sitting.

[0051] The thickness h of the support portion 11 and the back support portion 21 is 10mm, and preferably 5mm or more and 20mm or less. The angle β formed by the transition surface between the surface of the support portion 11 and the edge of the back support portion 21 is 18°, and preferably 15° or more and 20° or less. The length L1 of the support portion 11 in the front-to-back direction is 550mm, and preferably 500mm or more and 650mm or less; the width L2 of the support portion 11 in the left-to-right direction is 600mm, and preferably 500mm or more and 700mm or less. The optimized design of the transition angle enables a smooth connection between the surface and the edge, eliminates the feeling of pressure from sharp corners, and improves the smoothness when in contact with the body. The support portion 11 is adapted to the size range of the human hip and thigh, covering the support needs of users of different body types, ensuring that most people can obtain full and close support when sitting, distributing pressure, and enhancing the versatility and biomimetic adaptability of the seat.

[0052] In a preferred embodiment, refer to Figure 2 The support portion 11 includes an ischial support area 111, located on the side of the support portion 11 closest to the backrest 2. The ischial support area 111 is positioned to correspond to the human buttocks. Furthermore, the ischial support area 111 is positioned to correspond to the positions of the ischial tuberosities on both sides of the human body. The ischial support area 111 is horizontally recessed relative to the center of the support portion 11. The recessed design of the ischial support area 111 adapts to the physiological protrusion of the ischial tuberosities, allowing the area to be embedded in the corresponding region, avoiding pressure concentration caused by direct pressure on the ischial tuberosities, and relieving numbness and tingling after prolonged sitting. Simultaneously, the recessed structure provides natural positioning for the buttocks, preventing them from sliding forward, backward, or sideways during seating, thus improving seating stability. This design also optimizes the overall force distribution on the buttocks, ensuring that the pressure is evenly transmitted along the support area, meeting the physiological support needs of the human buttocks and enhancing the biomimetic support effect.

[0053] In a preferred embodiment, refer to Figure 2 and 3 The support portion 11 includes a thigh support area 112, located on the side of the support portion 11 away from the backrest 2. The thigh support area 112 is positioned to correspond to the posterior side of the human thigh and is horizontally raised relative to the center of the support portion 11. Specifically, the distance D1 between the upper surface of the thigh support area 112 and the lower surface of the ischial tuberosity support area 111 is 35mm. More preferably, D1 is between 20mm and 40mm. The raised structure of the thigh support area 112 closely conforms to the physiological curve of the posterior thigh, providing continuous upward support and avoiding the downward pulling sensation caused by the posterior thigh being unsupported, thus reducing fatigue load on the thigh muscles. This structure, together with the downward shape of the ischial tuberosity support area 111, forms a high-low connection, perfectly adapting to the continuous contour of the human body from the buttocks to the posterior thigh, making the force transmission of the lower limbs smoother, dispersing local pressure on the thighs, preventing poor blood circulation caused by pressure on the groin, and significantly improving lower limb comfort during prolonged sitting.

[0054] In a preferred embodiment, refer to Figures 3 to 5The support portion 11 has an extended support portion 113 on the side away from the backrest 2. The extended support portions 113 are arranged on the left and right sides of the support portion 11 and extend onto the seat cushion 1 along the side away from the backrest 2. The two extended support portions 113 are symmetrically arranged. Specifically, the extension length L3 of the extended support portion 113 is 80mm, and more preferably, L3 is more than 60mm and less than 120mm; the distance L4 between the edges of the two extension portions that are close to each other is 160mm, and more preferably, L4 is more than 150mm and less than 200mm. The symmetrically arranged extended support portions 113 can expand the support coverage of the seat cushion 1 on both sides of the thighs and fill the support gap between the support portion 11 and the edge of the seat cushion 1. The extended structure follows the natural extension trend of the thigh, can fit the outer curve of the thigh, disperse the pressure on the outer thigh, and relieve muscle tension. Meanwhile, the extended support 113 can avoid the knee pit area, preventing compression of blood vessels in the knee pit, ensuring smooth blood circulation in the lower limbs, maintaining the continuity of the curved surface of the seat cushion 1, and improving the overall fit of the thighs and riding comfort.

[0055] In a preferred embodiment, refer to Figure 2 and 5 The support section 11 has transition zones 12 on its left and right sides, corresponding to the pelvis and the root of the thigh. The transition zones 12 are raised from the ischial tuberosity support area 111 towards the thigh support area 112. Specifically, the elevation range of the transition zones 12 is the same as that of D1. This raised design of the transition zones 12 precisely adapts to the three-dimensional physiological shape of the pelvis and the root of the thigh, providing comprehensive support and avoiding compression or suspension problems caused by insufficient support. The gentle elevation from the ischial tuberosity support area 111 to the thigh support area 112 achieves a seamless transition of force from the buttocks to the root of the thigh, optimizing the pressure distribution in the pelvic area and reducing local pressure. Simultaneously, this structure wraps around both sides of the pelvis, preventing lateral pelvic displacement during sitting, maintaining postural stability, and reducing fatigue from prolonged sitting.

[0056] In a preferred embodiment, refer to Figure 5 and 6The back support 21 includes a lumbar support area 211, located at the lower end of the back support 21. The lumbar support area 211 is positioned to correspond to the human lumbar spine and protrudes forward vertically relative to the center of the back support 21. Specifically, the forward protrusion distance D2 of the lumbar support area 211 is 20mm, and more preferably, D2 is 15mm or more and 30mm or less. The surface of the lumbar support area 211 is concave rearward, and the angle γ2 formed by the concave surface is 174°, and more preferably, γ2 is 170° or more and 175° or less. The forward protrusion structure of the lumbar support area 211 precisely matches the physiological lordosis curve of the human lumbar spine, providing directional support, filling the support gap between the lumbar spine and the backrest 2, and preventing the physiological curvature of the lumbar spine from straightening due to unsupported movement. The recessed surface design further conforms to the contours of the lumbar spine, disperses tension in the muscles around the lumbar spine, reduces pressure on the intervertebral discs and ligaments, and relieves lower back pain and stiffness after prolonged sitting. This design guides the back to naturally conform to the backrest, maintaining the natural physiological posture of the lumbar spine and reducing the risk of lumbar strain.

[0057] In a preferred embodiment, refer to Figure 5 and 6 The back support 21 includes a chest and back area 212, located at the upper end of the back support 21. The chest and back area 212 corresponds to the thoracic vertebrae of the human body and is recessed rearward relative to the middle of the back support 21 in the vertical direction. Specifically, the rearward recessed distance D3 of the chest and back area 212 is 5mm; more preferably, D3 is more than 5mm and less than 10mm. The surface of the chest and back area 212 is recessed rearward, and the angle γ1 formed by the recessed surface is 177°; more preferably, γ2 is more than 175° and less than 180°. The rearward recessed structure of the chest and back area 212 can precisely adapt to the physiological kyphotic curve of the human thoracic vertebrae, allowing the chest and back to fully contact the backrest 2, effectively dispersing vertical and lateral pressure on the chest and back, and avoiding muscle fatigue caused by excessive local pressure. This area smoothly connects with the lumbar support area 211, forming a continuous support surface from the lumbar spine to the thoracic spine. This conforms to the overall physiological curvature of the spine, maintains a neutral spinal posture, and reduces compensatory tension in the chest and back muscles. At the same time, the recessed structure provides space for chest and back expansion, accommodates slight deformations during breathing, does not restrict physiological activities, and improves back comfort.

[0058] In a preferred embodiment, refer to Figure 5 and 7The backrest 2 has side wing areas 213 located on the left and right sides of the back support 21. These side wing areas 213 correspond to the sides of the human shoulder blades and torso, protruding forward towards the backrest 2. Specifically, the forward protrusion distance D4 of the side wing areas 213 is 5mm, preferably 50mm or more and 100mm or less. The angle δ between the inner surfaces of the side wing areas 213 is 140°, preferably 120° or more and 150° or less. The forward protrusion structure of the side wing areas 213 conforms to the physiological curves of the human shoulder blades and torso, providing lateral support and preventing the torso from shifting or sliding to the sides during seating, thus improving stability and safety. The optimized angle design of the side wing areas 213 adapts to the width of the human torso, filling the gaps between the sides of the torso and the backrest 2, avoiding uneven pressure caused by localized unsupported areas, distributing pressure on the shoulder blades and sides of the torso, and relieving muscle soreness. The smooth transition with the back support 21 forms a three-dimensional back support, achieving a full-body fit between the center and sides of the back, improving long-term riding comfort.

[0059] In a preferred embodiment, refer to Figure 7 The back support 21 has extensions 214 on both sides at the center height of the chest and back area 212. The extensions 214 are located on the side wings 213, and their edges smoothly transition to the edges of the back support 21. The extensions 214 extend away from the center of the chest and back area 212, and the side wings 213 are recessed towards the rear of the backrest 2 corresponding to the positions of the extensions 214. Specifically, the overall width L5 of the back support 21 is 350mm, preferably 300mm or more and 500mm or less. The distance L6 between the edges of the two extensions 214 is 520mm, preferably 500mm or more and 600mm or less. The distance L6 corresponds to the shoulder width of the human body. The recessed structure at the corresponding position of the side wings 213 effectively avoids scapular movement space, preventing scapular movement from being restricted by compression. The combination of height and shape ensures effective support for the chest and back without hindering slight upper body movements, thus balancing support stability with riding flexibility.

[0060] This application also provides a carrier, as shown in the embodiments. Figures 8 to 10The vehicle includes the aforementioned biomimetic curved seat structure 200 and a wheelchair assembly 100. The wheelchair assembly 100 is located at the bottom of the biomimetic curved seat structure 200 and includes a frame 104, and a front wheel assembly 101 and a rear wheel assembly 102 arranged parallel to each other on the front and rear sides of the frame 104, respectively. The combination of the biomimetic curved seat structure 200 and the wheelchair assembly 100 enables the vehicle to provide both comfortable seating and convenient mobility. The biomimetic support design of the seat provides users with all-around support, distributing pressure from prolonged sitting and reducing health risks such as pressure sores and scoliosis, thus meeting the long-term seating needs of people with mobility impairments. The parallel arrangement of the front wheel assembly 101 and the rear wheel assembly 102 ensures the stability of the vehicle, avoids bumps or tilting, improves driving safety, and enables flexible steering and straight-line driving, adapting to various indoor and outdoor mobility needs.

[0061] In a preferred embodiment, refer to Figure 8 The seat cushion 1 has a mounting plate 3 connected to its bottom. Armrests 31 are mounted on opposite sides of the mounting plate 3, located on the left and right sides of the backrest 2. The armrests 31 are securely fixed by the mounting plate 3 to prevent loosening or wobbling during use. Their position on either side of the backrest 2 adapts to the natural posture of the user's arms, providing stable support and relieving arm fatigue. Simultaneously, the armrests 31 assist users in getting in and out of the seat, providing support for people with mobility impairments and improving the convenience and safety of the seat.

[0062] In a preferred embodiment, refer to Figure 9 The armrest 31 includes a fixed section 311 and a movable section 312, with the lower end of the movable section 312 rotatably hinged to the upper end of the fixed section 311. This rotatable hinge structure between the movable section 312 and the fixed section 311 enables the armrest 31 to be folded and stowed. Folding and stowing in the non-use state significantly reduces the space occupied by the armrest 31, allowing for convenient storage. It also eliminates protruding obstructions around the seat, ensuring unobstructed access to surrounding space and preventing the armrest 31 from interfering with seating or surrounding activities. This improves the vehicle's adaptability in confined spaces, balancing ease of use with efficient space utilization.

[0063] In a preferred embodiment, refer to Figure 10The rear wheel assembly 102 has a drive assembly 103 connected to its axle. An operating device 32 is mounted on the handrail 31, specifically electrically connected to the drive assembly 103. In this embodiment, the drive assembly 103 is a DC brushless motor, and the operating device 32 is located on the handrail 31 corresponding to the user's right hand. Furthermore, the operating device 32 is located on the movable section 312. The drive assembly 103 provides power output to the vehicle, replacing traditional manual pushing, significantly reducing the user's operational intensity and meeting the autonomous travel needs of people with mobility impairments. The operating device 32 is located on the handrail 31, within convenient hand operation range, allowing users to easily control the vehicle's start, stop, speed adjustment, and steering functions, making operation intuitive and convenient.

[0064] In a preferred embodiment, refer to Figure 9 and 10 The frame 104 is equipped with a lifting assembly 105, the output end of which is connected to the bottom of the bionic curved seat structure 200. Specifically, the lifting assembly 105 is an electric cylinder assembly. The lifting assembly 105 drives the bionic curved seat structure 200 to rise and fall, and the operating device 32 is electrically connected to the lifting assembly 105. The lifting assembly 105 can drive the seat to achieve vertical height adjustment, which can adapt to the sitting posture needs of users of different heights. It can also be matched with different height platforms, entrances and exits, and other usage scenarios, expanding the applicability of the vehicle. The lifting can be conveniently controlled by the operating device 32 at the armrest 31, without the need for external tools or large body movements. The operation is simple and effortless, especially suitable for people with mobility impairments, improving the adaptability and practicality of the vehicle.

[0065] The above are all preferred embodiments of this application. These embodiments are merely explanations of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A biomimetic curved seat structure, comprising a seat cushion (1) and a backrest (2), wherein the seat cushion (1) and the backrest (2) are integrally formed, and the connection between the seat cushion (1) and the backrest (2) adopts a curved transition, characterized in that: Both the seat cushion (1) and the backrest (2) are formed by smooth transitions of multiple curved surfaces with different radii of curvature. The seat cushion (1) has a support part (11) in the middle, the support part (11) is set corresponding to the human buttocks and thighs, the support part (11) protrudes from the upper surface of the seat cushion (1), the thickness of the support part (11) is fixed relative to the upper surface of the seat cushion (1), and the edge of the support part (11) is connected to the curved surface of the upper surface of the seat cushion (1). The backrest (2) has a back support part (21) in the middle. The back support part (21) is set to correspond to the lumbar and thoracic vertebrae of the human body. The back support part (21) protrudes from the front surface of the backrest (2). The thickness of the back support part (21) is fixed relative to the front surface of the backrest (2). The edge of the back support part (21) is connected to the curved surface of the upper surface of the seat cushion (1).

2. The biomimetic curved seat structure according to claim 1, characterized in that: The support part (11) includes an ischial support area (111), which is located on the side of the support part (11) near the backrest (2). The ischial support area (111) is provided corresponding to the ischial tuberosities on both sides of the human body. The ischial support area (111) is recessed in the horizontal direction relative to the middle of the support part (11).

3. The biomimetic curved seat structure according to claim 2, characterized in that: The support part (11) also includes a thigh support area (112), which is located on the side of the support part (11) away from the backrest (2). The thigh support area (112) is provided corresponding to the back of the human thigh, and the thigh support area (112) is raised and protruded in the horizontal direction relative to the middle of the support part (11).

4. The biomimetic curved seat structure according to claim 3, characterized in that: The support part (11) has an extension support part (113) on the side away from the backrest (2). The extension support part (113) is provided on the left and right sides of the support part (11) and extends on the seat cushion (1) along the side away from the backrest (2).

5. The biomimetic curved seat structure according to claim 3, characterized in that: The support part (11) has transition areas (12) on the left and right sides. The transition areas (12) are set corresponding to the human pelvis and the root of the thigh. The transition areas (12) are raised from the ischium support area (111) toward the thigh support area (112). The transition areas (12) are raised away from the center of the support part (11).

6. The biomimetic curved seat structure according to claim 1, characterized in that: The front surface of the backrest (2) is inclined backward from bottom to top.

7. The biomimetic curved seat structure according to claim 6, characterized in that: The back support (21) includes a lumbar support area (211), which is located at the lower end of the back support (21). The lumbar support area (211) is set to correspond to the human lumbar spine, and the lumbar support area (211) protrudes forward in the vertical direction relative to the middle of the back support (21).

8. The biomimetic curved seat structure according to claim 7, characterized in that: The back support includes a chest and back area (212), which is located on the upper side of the back support (21). The chest and back area (212) corresponds to the thoracic vertebrae of the human body and is recessed in the vertical direction relative to the middle of the back support (21).

9. The biomimetic curved seat structure according to claim 8, characterized in that: The backrest (2) is provided with a side wing area (213), which is located on the left and right sides of the back support (21). The side wing area (213) is provided corresponding to the sides of the human shoulder blade and torso, and the side wing area (213) protrudes towards the front of the backrest (2).

10. The biomimetic curved seat structure according to claim 9, characterized in that: The back support (21) has extensions (214) on the left and right sides at the center height of the chest and back area (212). The edges of the extensions (214) are smoothly connected to the edges of the back support (21). The extensions (214) extend away from the center of the chest and back area (212). The side wing area (213) is recessed towards the rear side of the backrest (2) corresponding to the position of the extensions (214).

11. A vehicle comprising a biomimetic curved seat structure as described in any one of claims 1-10, characterized in that: It also includes a wheelchair assembly (100) disposed at the bottom of the biomimetic curved seat structure (200), the wheelchair assembly (100) including a front wheel assembly (101) and a rear wheel assembly (102) arranged in parallel.

12. A vehicle according to claim 11, characterized in that: The bottom of the seat cushion (1) is connected to a mounting plate (3), and armrests (31) are installed on opposite sides of the mounting plate (3). The two armrests (31) are located on both sides of the backrest (2).

13. A vehicle according to claim 12, characterized in that: The handrail (31) includes a fixed section (311) and a movable section (312), wherein the movable section (312) is rotatably hinged to the fixed section (311).

14. A vehicle according to claim 12, characterized in that: The rear wheel assembly (102) is connected to a drive assembly (103) via a rotating shaft. An operating device (32) is provided on the armrest (31), and the operating device (32) is electrically connected to the drive assembly (103).

15. A vehicle according to claim 14, characterized in that: The wheelchair assembly (100) includes a frame (104), the front wheel assembly (101) and the rear wheel assembly (102) are mounted on the frame (104), the frame (104) is provided with a lifting assembly (105), the output end of the lifting assembly (105) is connected to the bottom of the bionic curved seat structure (200), the lifting assembly (105) drives the bionic curved seat structure (200) to rise and fall, and the operating device (32) is electrically connected to the lifting assembly (105).

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