Chair device with zone adjustment function

Abstract

A chair device with zoned adjustment function includes a backrest frame, a backrest, and an adjustable mechanism mounted on a chair base. The backrest includes multiple backrest pads, which are independently arranged to divide the backrest into multiple independent support areas. The adjustable mechanism is connected between the backrest frame and the backrest. Each backrest pad can independently change its position relative to the backrest frame under the adjustment of the adjustable mechanism to change the spatial state of the backrest. By dividing the backrest into multiple independent support areas, this invention allows the chair to precisely adapt to users of different heights and body types, achieving refined segmented support for the neck, back, and waist, perfectly conforming to the curve of the human back, supporting every muscle in the back, and solving the problem that traditional chairs cannot meet the needs of different users. In addition, this invention further divides the backrest into a head and back support area and a lumbar support area, the head and back support area of ​​which is height adjustable. Furthermore, the support frame can switch between an upright position and a reclining position.

Description

Technical Field

[0001] This invention relates to the field of seating, and in particular to a chair device with zoned adjustment function. Background Technology

[0002] With the improvement of people's living standards and changes in work styles, the comfort of chairs (such as office chairs, gaming chairs, or functional sofas) is receiving increasing attention. Existing chairs typically feature a single-piece backrest or only allow for overall angle adjustment. However, the curves of the human back vary from person to person; the physiological curvatures of the cervical, thoracic, and lumbar vertebrae differ among individuals of different heights and body types. A single-piece backrest often cannot simultaneously meet the support needs of different areas, easily leading to over- or under-support in certain areas, and causing muscle fatigue with prolonged use. While chairs with overall angle adjustment typically offer single-dimensional, one-dimensional movement, they lack the ability to finely distribute and adjust the backrest's spatial shape, failing to meet users' personalized needs for specific areas (such as enhanced lumbar support or shoulder relaxation). Therefore, existing chairs cannot provide targeted adjustments for different users or different body parts, and their comfort still needs improvement. Summary of the Invention

[0003] The present invention aims to solve the above problems and improve a chair device with zone adjustment function, which can independently adjust different zones for different users and different parts of the human body to improve user comfort.

[0004] To address the above problems, the present invention provides a chair device with zoned adjustment function, characterized in that it comprises:

[0005] The backrest frame is mounted on the chair base;

[0006] The backrest includes multiple backrest cushions, which are independently arranged to divide the backrest into multiple independent support areas.

[0007] An adjustable mechanism is connected between the backrest frame and the backrest;

[0008] Each backrest cushion can independently change its position relative to the backrest frame under the adjustment of the adjustable mechanism to change the spatial state of the backrest.

[0009] Furthermore, the backrest cushions are arranged along the height and / or width direction of the backrest frame to divide the backrest into multiple independent support areas.

[0010] Furthermore, the backrest includes a first backrest and a second backrest arranged along the height direction of the backrest frame, with the first backrest located above the second backrest.

[0011] Both the first backrest and the second backrest have a degree of freedom for position adjustment along the lateral direction to or away from the backrest frame; the first backrest also has a degree of freedom for vertical displacement along the height direction.

[0012] Furthermore, the first backrest structure is a head and back support area, which can be adapted to the shoulder, neck and head support height of the human body through the lifting displacement degree of freedom, and can provide support state adjustment through the position adjustment degree of freedom;

[0013] The second backrest structure is a lumbar support area, which can provide support state adjustment through the aforementioned position adjustment degree of freedom.

[0014] Furthermore, the adjustable mechanism includes several adjusting bolts, one end of which is connected to the backrest frame and the other end is connected to each backrest pad. By rotating the adjusting bolts, the backrest pads are driven to move relative to the backrest frame.

[0015] Furthermore, the adjusting bolt is provided with a knob for easy manual operation, and a locking nut or elastic anti-loosening component is provided between the adjusting bolt and the backrest frame to maintain a stable posture.

[0016] Furthermore, the adjustable mechanism includes a drive motor and a transmission assembly. The drive motor is electrically connected to the chair base or backrest frame, and its power output end is connected to the corresponding backrest cushion through the transmission assembly to drive the backrest cushion to move relative to the backrest frame.

[0017] Furthermore, the adjustable mechanism also includes a controller, which is electrically connected to the drive motor and is used to independently control the start and stop angles of each drive motor so that each backrest cushion forms a preset support surface in space.

[0018] Furthermore, the backrest frame is movably connected to the chair base so that the backrest frame can switch between an upright state for sitting and a reclining state for lying down relative to the chair base; in the reclining state, the backrest frame is tilted at a large angle or laid flat relative to the chair base.

[0019] Furthermore, when the backrest frame switches from the upright state to the reclining state, the adjustable mechanism can drive the multiple backrest cushions to synchronously adjust their posture so that the spatial state of the backrest adapts to the human body's lying posture.

[0020] The beneficial contribution of this invention lies in its effective solution to the aforementioned problems. By dividing the backrest into multiple independent support areas, each backrest cushion can independently change position. This non-uniform design precisely adapts to the spinal curves of users of different heights and body types, achieving refined segmented support for the neck, back, and waist. This solves the problem that traditional chairs cannot meet the needs of different users, avoiding problems such as lumbar muscle strain and frozen shoulder caused by prolonged sitting. Furthermore, this invention further divides the backrest into a head-back support area and a lumbar support area. The head-back support area is height-adjustable, allowing the backrest cushions in each area to precisely align with the key pressure points of the cervical spine for users of different heights, solving the problem of traditional chairs being unable to adjust due to fixed support height. Additionally, the support frame can switch between an upright and reclining position to meet different user needs. The device of this invention allows the spatial state of the backrest to be dynamically adjusted according to the user's needs. This not only effectively disperses back pressure and prevents muscle strain but also significantly improves the user's physiological comfort and psychological well-being in different usage scenarios, enhancing overall user comfort. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the principle framework of the present invention.

[0024] Figure 4 This is another structural diagram.

[0025] The attached diagrams are labeled as follows: backrest frame 10, chair base 20, backrest 30, first backrest 31, second backrest 32, backrest cushion 301, adjustable mechanism 40, adjusting bolt 41, drive motor 43, transmission assembly 44, and controller 45. Detailed Implementation

[0026] The following embodiments are further explanations and supplements to the present invention and do not constitute any limitation on the present invention.

[0027] like Figures 1 to 4 As shown, the key feature of this invention is that it divides the overall support area of ​​the traditional backrest 30 into multiple independent support areas, and through the connection of the adjustable mechanism 40 with each backrest cushion 301, the position and posture of each backrest cushion 301 relative to the backrest frame 10 can be changed independently. Through this partitioned structural design, this invention can precisely reshape the spatial state of each support area according to actual needs, achieving precise alignment of key parts such as the neck, back, and waist, thereby adapting to the physiological curves of users of different heights and body types, thus improving support comfort and enhancing user comfort.

[0028] The chair device with zoned adjustment function of the present invention includes a backrest frame 10, a backrest 30, and an adjustable mechanism 40.

[0029] The backrest frame 10 is mounted on the chair base 20 and is used to provide the main support for the backrest. It is a rigid structure and serves not only as the main support body of the backrest 30, but also as the mounting base for the subsequently described adjustable mechanism 40 and multiple backrest cushions 301.

[0030] The chair base 20 is the basic structure that provides a seat for the user. Its form is not limited; it can be a swivel chair base that can rotate (such as the four-claw swivel chair base of a computer chair) or a non-rotatable stool base (such as...). Figure 1 , Figure 2 As shown in the figure, the specific settings can be adjusted according to actual needs.

[0031] In some embodiments, the backrest frame 10 is fixedly mounted on the chair base 20. In some embodiments, the backrest frame 10 is movably mounted on the chair base 20 and its tilt angle is adjustable, so that the backrest frame 10 can switch between an upright position for sitting and a reclining position relative to the chair base 20.

[0032] The backrest frame 10 can be configured in various ways; it can be plate-shaped or column-shaped. It can be configured as a traditional chair back or as a skeletal structure formed by multiple rod-shaped structures. The backrest frame 10 can withstand the force of the user leaning against it, but the shape of the backrest frame 10 itself is not required to be suitable for the user to lean against. However, the backrest frame 10 needs to provide support for the installation of the backrest 30. Therefore, plates, frame structures, etc., can all serve as the backrest frame 10.

[0033] The backrest 30 is used by a user to lean on, providing a support surface for the user to contact and lean against. The backrest 30 includes multiple backrest pads 301, which are independently arranged to divide the backrest 30 into multiple independent support areas. The number of backrest pads 301 is not limited and can be set as needed. When multiple backrest pads 301 are provided, they are arranged along the height and / or width direction of the backrest frame 10 to divide the backrest 30 into multiple independent support areas. In some embodiments, the multiple backrest pads 301 are arranged along the height direction of the backrest frame 10 to divide the backrest 30 into multiple independent support areas. In some embodiments, the multiple backrest pads 301 are arranged along the width direction of the backrest frame 10 to divide the backrest 30 into multiple independent support areas. In some embodiments, the multiple backrest pads 301 can be mixed, with some backrest pads 301 arranged along the height direction and some along the width direction, thereby dividing the backrest 30 into multiple independent support areas.

[0034] In this embodiment, multiple backrest cushions 301 are arranged in a mixed horizontal and vertical pattern to construct a precise support structure for different anatomical parts of the human body:

[0035] Corresponding to the human spine and lumbar region, at least two backrest pads 301 are arranged sequentially along the height direction, forming a central longitudinal adjustment zone. The backrest pads 301 in this central longitudinal adjustment zone can be independently adjusted to precisely adapt to the varying depths of the lumbar physiological curves of different users, providing continuous vertical support. On the left and right sides of the central longitudinal adjustment zone, symmetrically arranged side backrest pads 301 are provided along the width direction. These side backrest pads 301 can be deflected inwards or extended outwards relative to the backrest frame 10, thereby adjusting the lateral posture according to the user's body width and forming lateral support and coverage for the back and sides of the waist.

[0036] The adjustable mechanism 40 is connected between the backrest frame 10 and the backrest 30. The adjustable mechanism 40 allows the backrest 30 to be mounted on the backrest frame 10 and transmit force, enabling the backrest 30 to support the user's lean. More importantly, the adjustable mechanism 40 can be used to adjust the position of the backrest cushion 301, thereby changing the spatial state of the backrest 30. In some embodiments, the adjustable mechanism 40 is a manually adjustable structure to reduce costs. In some embodiments, the adjustable mechanism 40 is an electrically adjustable mechanism 40 to improve adjustment convenience. In practice, the adjustable mechanism 40 is set to be manual or electrically adjustable depending on the product positioning.

[0037] In the device of the present invention, each backrest cushion 301 can independently change its position relative to the backrest frame 10 under the adjustment of the adjustable mechanism 40 to change the spatial state of the backrest 30.

[0038] Multiple backrest cushions 301 are distributed non-linked, and the adjustable mechanism 40 can adjust any one designated backrest cushion 301 individually without affecting the current position of the other backrest cushions 301. This allows the device to provide differentiated compensation for local characteristics of the user's spine (such as lumbar disc herniation, shoulder width, etc.), achieving a leap from overall support to precise "point-to-point" support. Through the discretized combination of the poses of each zone of backrest cushions 301, the overall surface of the backrest 30 can evolve from an initial planar state to a complex fitted curved surface state, which can form various spatial states such as a wrapping concave surface or a supporting convex surface that conforms to the static physiological curve of a specific user.

[0039] It should be noted that the multiple backrest cushions 301 are distributed in a non-linked manner, meaning that each backrest cushion 301 has an independent adjustment path. The adjustable mechanism 40 can perform single-point posture changes for any designated backrest cushion 301. This non-linked distribution ensures that the device can perform fine-tuning on specific parts of the human back (such as only the third lumbar vertebra) without accidentally affecting other support areas that are already in a comfortable position, thus achieving a very high degree of adjustment freedom. Based on its independent adjustment capability, the adjustable mechanism 40 can support combined or synchronous adjustment of multiple backrest cushions 301. For example, multiple backrest cushions 301 can be defined as a group, and the backrest cushions 301 within the group can be adjusted synchronously, which does not contradict the aforementioned non-linked distribution. In other words, the backrest cushions 301 can be adjusted independently, and based on independent adjustment, several backrest cushions 301 can be set to be adjusted synchronously or asynchronously as needed. This split-and-combination adjustment mechanism of the backrest cushions 301 allows the device to meet both highly personalized, precise single-point adjustment and rapid overall form switching. Independent adjustment provides precision, while synchronous adjustment provides efficiency. The two work together to allow the backrest 30's spatial state to dynamically and comprehensively adapt to the user's physiological needs in different scenarios.

[0040] When the backrest 30 includes multiple backrest cushions 301, the shape and size of each backrest cushion 301 can be the same or different, and can be set according to the needs.

[0041] The backrest cushion 301 is generally plate-shaped, and the shape of its support surface can be flexibly designed according to ergonomic needs.

[0042] In some embodiments, the backrest cushion 301 adopts a planar design, which has high versatility and makes it easy to combine multiple planar blocks by angular deflection to form a multi-fold support envelope.

[0043] In a preferred embodiment, the support surface of each backrest cushion 301 has a specific pre-formed curvature (such as a concave surface conforming to the contour of the back muscles or a convex surface conforming to the physiological curvature of the lumbar spine). This curved panel structure allows the individual backrest cushion 301 to fit more closely to the human skin, effectively avoiding edge pressure pain.

[0044] When multiple backrest cushions 301 are arranged on the backrest frame 10 according to a preset pattern, their supporting surfaces are adjacent to each other in space, jointly constructing a continuous biomimetic support surface. Through the adjustable mechanism 40, the posture of each backrest cushion 301 can be independently or in conjunction with other backrest cushions, allowing the originally discrete backrest cushions 301 to present a staggered and varied spatial arrangement, thus simulating a complex three-dimensional surface conforming to human anatomy. Moreover, this surface composed of multiple backrest cushions 301 has extremely high deformation freedom. Compared to traditional single-piece flexible foam, the hard or semi-hard partitioned backrest cushions 301 of this invention, through spatial posture reorganization, can provide a more balanced support force and more controllable deformation, thereby consistently providing precise ergonomic support under different usage postures.

[0045] Furthermore, to better suit the needs of users of different heights, the backrest 30 is divided into a first backrest 31 and a second backrest 32 arranged along the height direction of the backrest frame 10, with the first backrest 31 located above the second backrest 32.

[0046] The first backrest 31 is a head and back support area, which is used to support the head, shoulders and neck. It is located at the high position of the backrest frame 10 to provide stable spatial limitation and force support for the user's head, neck and shoulders, and relieve the tension pressure on the neck muscles when working at a desk or leaning back for a long time.

[0047] The second backrest 32 is a lumbar support area used to support the waist. It is located at the low position of the backrest frame 10 and aims to maintain the natural physiological lordosis of the lumbar spine by providing strong support to the waist, and prevent the spine from deforming due to lack of support.

[0048] To improve the precision of surface fitting, the first backrest 31 and the second backrest 32 are not a single unit, but are each composed of several independent backrest pads 301. The first backrest 31 and the second backrest 32 each include multiple backrest pads 301 distributed along the height direction and / or the width direction.

[0049] Both the first backrest 31 and the second backrest 32 have a degree of freedom for position adjustment, moving laterally toward or away from the backrest frame 10 in the direction of height. This degree of freedom includes at least horizontal forward and backward extension; in some embodiments, it may also include horizontal left and right translation, and rotation / deflection within the horizontal plane. These degrees of freedom all occur in a plane substantially laterally to the height. Horizontal forward and backward extension refers to the backrest cushion 301 moving directly toward the user's back or retracting toward the backrest frame 10. Horizontal left and right translation refers to adjustment relative to the left and right sides of the backrest frame 10 to accommodate different users' shoulder or back widths. Horizontal rotation / deflection refers to the backrest cushion 301 swinging left and right around a vertical axis, changing the contact angle between the backrest cushion 301 and the user's back.

[0050] The first backrest 31 can dynamically change the relative distance between its support surface and the backrest frame 10 by adjusting its position. For example, for users with different back thicknesses (such as rounded shoulders or flat backs), the first backrest 31 can protrude forward to fill the recessed area behind the neck or between the shoulder blades, or retract backward to provide greater reclining space, thereby ensuring that the connection between the head and back receives just the right amount of support.

[0051] The second backrest 32, through its adjustable position and degree of freedom, is primarily used to achieve precise alignment with the user's lumbar spine's physiological curvature. For example, for some users, the second backrest 32 can extend away from the backrest frame 10 (i.e., towards the user's lower back), forming a targeted support protrusion. The height of this protrusion can be adjusted according to the degree of unsupported position of the user's lower back, thereby effectively maintaining the natural physiological lordosis of the lumbar spine and preventing excessive straightening or curvature of the spine due to lack of support.

[0052] Furthermore, the first backrest 31 also has a degree of freedom for vertical displacement along the height direction. In addition to its lateral adjustment capability, the first backrest 31 is further equipped with a degree of freedom for vertical displacement that moves along the height direction of the backrest frame 10. This degree of freedom allows the first backrest 31 to be continuously or progressively adjusted in the upper region of the backrest frame 10. This is because different users have significantly different sitting heights and back lengths; the first backrest 31, through vertical displacement, can flexibly adjust the height of its support center. This variability in height ensures that the first backrest 31 can provide effective support regardless of the user's height.

[0053] Users of different heights and body types have significant differences in the relative positions of their lumbar spine and shoulders. This application divides the backrest 30 into a first backrest 31 and a second backrest 32. By adjusting the relative distance and spatial height between the two, it can flexibly simulate a support structure suitable for users of different heights. This structural flexibility can greatly broaden the target audience of the product and improve its versatility.

[0054] Furthermore, the adjustable mechanism 40 is used to adjust the spatial position of the backrest cushion 301. In different embodiments, it can be configured with different structures to achieve the aforementioned functions.

[0055] In some embodiments, the adjustable mechanism 40 is configured as a manually adjustable mechanism 40, which emphasizes reliability and economy, and has the advantages of simple structure and low cost. In some embodiments, the adjustable mechanism 40 is configured as an electrically adjustable mechanism 40, which emphasizes intelligence and convenience, and can provide users with a more advanced user experience.

[0056] Manually adjustable mechanism 40:

[0057] The adjustable mechanism 40 includes a plurality of adjusting bolts 41, one end of which is connected to the backrest frame 10 and the other end to each backrest pad 301. Rotating the adjusting bolts 41 (either by hand or with a tool) moves the backrest pads 301 relative to the backrest frame 10. For ease of adjustment, in some embodiments, the adjusting bolts 41 are provided with a knob for easy manual operation, and a locking nut or elastic anti-loosening element is provided between the adjusting bolts 41 and the backrest frame 10 to maintain stable posture. In some embodiments, the adjusting bolts 41 are provided with a turning structure for easy tool insertion and tightening, allowing the user to rotate the adjusting bolts 41 using a tool.

[0058] Specifically, the threaded portion of each adjusting bolt 41 passes through a pre-set threaded hole or internal threaded sleeve on the backrest frame 10, forming a threaded mating pair. One end of the adjusting bolt 41 (near the user) is connected to the back of the corresponding backrest cushion 301 via a rotating joint, while the other end (far from the user) has a knob or lever mechanism for easy operation. When the user rotates the adjusting bolt 41 with external torque, the adjusting bolt 41 undergoes controlled axial displacement relative to the backrest frame 10, thereby driving the backrest cushion 301 to move away from or towards the user's back, thus adjusting the spatial position of the backrest cushion 301. For example, rotating the adjusting bolt 41 clockwise drives the backrest cushion 301 towards the user's back, thereby increasing the support depth or support force in that area. Rotating the adjusting bolt 41 counterclockwise causes the adjusting bolt 41 to retract the backrest cushion 301 towards the backrest frame 10, thereby freeing up space to accommodate thicker users or switch to a relaxed posture. Once the adjustment stops, the backrest cushion 301 can be locked in any spatial position by relying on the friction between the threads. Even when a large impact force or continuous heavy pressure is applied to the back of the user, the adjusting bolt 41 will not disengage or slip, ensuring a high degree of stability in the zoned support state. Due to the small thread lead, the user can achieve precise millimeter-level displacement of the backrest cushion 301 with a slight rotation, thereby achieving fine-tuning of the back pressure distribution.

[0059] Furthermore, each backrest cushion 301 is equipped with an independent adjusting bolt 41, allowing users to adjust the depth of the backrest cushions 301 at different heights or widths symmetrically or asymmetrically as needed. This purely mechanical adjustment scheme not only reduces the overall power consumption and failure rate of the device, but also provides an intuitive and reliable physical feedback.

[0060] Furthermore, since the depth of the adjusting bolt 41 relative to the same plane may vary after rotation, to prevent the adjusting bolt 41 from protruding from the backrest frame 10 after adjustment and affecting aesthetics or safety, a countersunk hole can be provided on the backrest frame 10. The countersunk hole has a certain depth to accommodate part of the length of the adjusting bolt 41; in this way, the adjusting bolt 41 will not protrude from the back side of the backrest frame 10 under different adjustment degrees. In use, a wrench (such as a screwdriver) is inserted into the countersunk hole, and then the adjusting bolt 41 is turned to adjust the distance between the backrest pad 301 and the backrest frame 10, thereby achieving different backrest curvatures to meet actual usage needs.

[0061] Electric adjustable mechanism 40:

[0062] The adjustable mechanism 40 includes a drive motor 43 and a transmission assembly 44. The drive motor 43 is electrically connected to the chair base 20 or the backrest frame 10, and its power output end is connected to the corresponding backrest cushion 301 through the transmission assembly 44 to drive the backrest cushion 301 to move relative to the backrest frame 10.

[0063] The drive motor 43 can be a miniature DC geared motor, stepper motor, or servo motor, etc., and is securely electrically connected and fixed inside the chair base 20 or in the backrest mounting slot of the backrest frame 10. Each individual backrest cushion 301 is equipped with at least one dedicated drive motor 43, thus forming a multi-channel independent control structure.

[0064] The power output end of the drive motor 43 is connected to the corresponding backrest cushion 301 via a dedicated transmission assembly 44. The transmission assembly 44 includes, but is not limited to, a lead screw and nut pair, a worm gear transmission group, or a gear and rack mechanism. When the drive motor 43 starts, the circular rotational motion generated at its output end is efficiently converted into linear reciprocating motion along a horizontal direction or a preset trajectory through the transmission assembly 44 (such as a screw rotating to drive a moving slider). This linear motion directly acts on the backrest cushion 301, driving it to extend towards the back of the human body or retract towards the frame relative to the backrest frame 10, thereby dynamically changing the depth and support force of the partition support area.

[0065] The adjustable mechanism 40 also includes a controller 45, which is electrically connected to the drive motors 43. The controller 45 independently controls the start and stop angles of each drive motor 43 to ensure that each backrest cushion 301 forms a preset support surface in space. The controller 45 can accurately identify and call specific drive motors 43. By adjusting the start time, stop time, and output angle (or number of steps) of the drive motors 43, the controller 45 can precisely adjust the displacement stroke of each backrest cushion 301. The protrusion height, pitch angle, or translation distance of each backrest cushion 301 in space is calculated and locked in real time by the controller 45 based on feedback from the drive motors 43. This ensures that each independent support area can be adjusted independently without interference, ensuring that each backrest cushion 301 accurately stops at the user's most comfortable spatial coordinate point, while maintaining extremely high positioning consistency.

[0066] In a preferred embodiment, the drive motor 43 is equipped with a displacement sensor (such as a Hall encoder) or an electronically controlled limit switch.

[0067] Furthermore, in some embodiments, the controller 45 is pre-loaded with various support surface algorithm models for different application scenarios and human body shapes, allowing users to easily select and quickly reconstruct the discrete backrest cushion 301 into a pre-set biomimetic support surface. Furthermore, the controller 45 also includes a storage module for recording the comfortable posture data of a specific user. Through simple interaction, the user can drive the motor group 43 to restore it to its own "pre-set spatial state," thereby improving the convenience of intelligent use.

[0068] The device provided by this invention allows the adjustable mechanism 40 to be flexibly configured as a manual or electric adjustment structure according to product positioning, usage environment, and user needs. Whether manual or electric adjustment is used, the goal is to drive each backrest cushion 301 to undergo a positional change relative to the backrest frame 10.

[0069] Furthermore, the manually adjustable or automatically adjustable mechanism 40 primarily adjusts linear displacement along a preset direction to drive the backrest cushion 301 closer to or further away from the backrest frame 10, substantially perpendicular to the height direction. If fine-tuning of the angle (i.e., the aforementioned rotation / deflection in the horizontal plane) is required, the backrest cushion 301 can be connected to the adjustable mechanism 40 via a universal joint. In this way, the backrest cushion 301 can generate a certain range of adaptive deflection when under pressure, thereby automatically aligning with the user's back contour. For example, a universal joint is provided between the output end of the adjustable mechanism 40 (whether a manual bolt or an electric transmission assembly 44) and the backrest cushion 301. The universal joint includes a ball head fixed to the end of the transmission assembly 44 and a ball socket located at the center of the back of the backrest cushion 301 or at the point of force application; the ball head is embedded in the ball socket and forms a spatial rotation pair. The backrest cushion 301 can deflect angularly around the center of the ball relative to the adjustable mechanism 40 in three-dimensional space. When the adjustable mechanism 40 drives the backrest cushion 301 to move along a preset straight line to contact the user's back, as the back pressure is applied, the backrest cushion 301, under the action of the universal structure, will passively adjust its angle according to the degree of bulging of the local muscles of the user's back or the tilt angle of the spine. The supporting surface of the backrest cushion 301 will automatically tilt to a position flush with the surface of the human skin. This "automatic alignment" ensures that the backrest cushion 301 and the human back always maintain the maximum contact area, effectively avoiding local pressure pain. Each individual backrest cushion 301 is not only adjustable in position, but its posture can also automatically level itself according to the physiological contours of different users, thus making it easy to construct an intelligent support structure with highly flexible and biomimetic features.

[0070] Furthermore, in some embodiments, the backrest frame 10 is movably connected relative to the chair base 20 so that the backrest frame 10 can switch between an upright state for sitting and a reclining state for lying down relative to the chair base 20; in the reclining state, the backrest frame 10 is tilted at a large angle or laid flat relative to the chair base 20.

[0071] In this embodiment, the backrest frame 10 is not fixedly installed, but is movably connected to the rear end of the chair base 20 via a pivot, hinge, or multi-link synchronizer. This connection method allows the backrest frame 10 to have pitch freedom relative to the chair base 20, enabling it to rotate steplessly or in multiple stages within a preset angle range. The movable adjustment structure between the backrest frame 10 and the chair base 20 can refer to existing technologies, and this invention does not limit it.

[0072] In the upright position, the backrest frame 10 and the chair base 20 maintain a near-vertical or slightly backward-leaning angle (e.g., 95° to 110°). At this time, the backrest cushions 301 combine to dynamically cover the physiological curve of the human back, mainly meeting the support needs when working or sitting upright.

[0073] When the user needs to rest, the backrest frame 10 can be tilted back significantly relative to the chair base 20, entering a reclining state. In this state, the backrest frame 10 is tilted at a large angle (e.g., 135° to 170°) or laid flat towards a horizontal position. At this time, the multiple independently partitioned backrest cushions 301 and the upper surface of the chair base 20 together form a support surface with an ultra-long travel range.

[0074] Compared to ordinary seats, this device allows for adjustment of the position of each section of the backrest cushion 301 via the adjustable mechanism 40 (electric or manual adjustable mechanism 40) when reclined, thus providing better fit and support. For example, the second backrest 32 (lumbar region) can extend slightly upwards to maintain padded support for the lumbar spine when reclined, giving the device true physiological comfort of a reclining chair.

[0075] To ensure structural stability, a position locking mechanism (such as a gas spring, gear engagement, or electric push rod) is provided between the backrest frame 10 and the chair base 20. Whether in an upright or reclining position, the locking mechanism provides sufficient support rigidity to ensure that the relative position between the frame and the base is stable and reliable when the user is lying down or sitting, without any unexpected shaking or angular slippage.

[0076] Furthermore, in some embodiments, when the adjustable mechanism 40 is electrically adjustable, when the backrest frame 10 switches from the upright state to the reclining state, the adjustable mechanism 40 can drive the multiple backrest cushions 301 to synchronously adjust their posture so that the spatial state of the backrest 30 adapts to the human lying posture. In this embodiment, when the backrest frame 10 performs a switching action from the "upright state" to the "reclining state" relative to the chair base 20, the controller 45 monitors the tilt angle of the backrest frame 10 in real time and synchronously sends compensation commands to the drive motors 43 distributed in each section, driving the multiple backrest cushions 301 to perform synchronous posture adjustment to reshape the spatial curvature of the backrest 30 in real time during the reclining process. This linkage adjustment ensures that the spatial state of the backrest 30 is not statically fixed, but dynamically evolves with the change of the tilt angle of the backrest frame 10.

[0077] With the synchronized adjustment of each backrest cushion 301, the user only needs to trigger an adjustment command, and the device can automatically complete the complete spatial reconstruction from sitting support to lying support, greatly simplifying the operation process and enhancing the depth of intelligent interaction.

[0078] Furthermore, in a preferred embodiment, the controller 45 stores a pose mapping table for different tilt angles; when the backrest frame 10 reaches a preset tilt angle (e.g., 160°), each backrest cushion 301 precisely moves to the corresponding coordinate point, thereby constructing a flat support structure that best conforms to biomechanical distribution in the tilted state.

[0079] Furthermore, in some preferred embodiments, a pressure sensor array (such as a flexible thin-film pressure sensor or a piezoelectric sensor) is integrated below the supporting surface of each of the backrest cushions 301. When the backrest frame 10 switches from an upright state to a reclining state, the sensor array captures the contact pressure distribution data between the human back and each section of the backrest cushion 301 in real time and feeds it back to the controller 45. The controller 45 performs closed-loop control on each drive motor 43 based on the received pressure data, driving each backrest cushion 301 to reach the most comfortable posture. For example, if the pressure value of a certain backrest cushion 301 (such as the lumbar region) is detected to be lower than a preset threshold, it is determined that there is a "suspended" phenomenon in that area. The controller 45 then drives the corresponding drive motor 43 to extend the backrest cushion 301 towards the human body until the pressure reaches a comfortable range. If the pressure in a certain area (such as the scapula) is detected to be too high, the controller 45 drives the backrest cushion 301 to retract moderately away from the human body to achieve pressure distribution. Through pressure detection, regardless of the user's body size or spinal flexibility, the controller 45 can maintain a uniform distribution of back pressure during the backward tilting process through dynamic fine-tuning.

[0080] Furthermore, the controller 45 can also record the user's optimal pressure distribution preference at different tilt angles. When the user uses the product again, the system can quickly recall personalized pressure parameters and directly drive each backrest cushion 301 to the most comfortable initial position, greatly enhancing the product's intelligent interaction depth.

[0081] Thus, the chair device with zoned adjustment function in this embodiment is constituted, which deconstructs the traditional one-piece backrest 30 into multiple independently controlled zones, breaking the limitation that the one-piece backrest 30 cannot be personalized. The device of the present invention can be personalized for users of different heights and body types, which can greatly improve the versatility and user experience of the chair device.

[0082] Although the present invention has been disclosed through the above embodiments, the scope of the present invention is not limited thereto. Without departing from the concept of the present invention, the above components can be replaced by similar or equivalent elements known to those skilled in the art.

Claims

1. A chair device with zoned adjustment function, characterized in that, It includes: The backrest frame (10) is mounted on the chair base (20); The backrest (30) includes a plurality of backrest cushions (301), which are independently arranged to divide the backrest (30) into a plurality of independent support areas. An adjustable mechanism (40) is connected between the backrest frame (10) and the backrest (30); Each backrest cushion (301) can independently change its position relative to the backrest frame (10) under the adjustment of the adjustable mechanism (40) to change the spatial state of the backrest (30).

2. The chair device with zoned adjustment function as described in claim 1, characterized in that, The backrest cushion (301) is arranged along the height and / or width direction of the backrest frame (10) to divide the backrest (30) into multiple independent support areas.

3. The chair device with zoned adjustment function as described in claim 1, characterized in that, The backrest (30) includes a first backrest (31) and a second backrest (32) arranged along the height direction of the backrest frame (10), wherein the first backrest (31) is located above the second backrest (32). The first backrest (31) and the second backrest (32) both have a degree of freedom for position adjustment along the horizontal direction toward or away from the backrest frame (10) in the height direction; the first backrest (31) also has a degree of freedom for vertical displacement along the height direction.

4. The chair device with zoned adjustment function as described in claim 3, characterized in that, The first backrest (31) is constructed as a head and back support area, which can be adapted to the shoulder, neck and head support height of the human body through the lifting displacement degree of freedom, and can provide support state adjustment through the position adjustment degree of freedom; The second backrest (32) is constructed as a lumbar support area, which can provide support state adjustment through the position adjustment degree of freedom.

5. The chair device with zoned adjustment function as described in claim 1, characterized in that, The adjustable mechanism (40) includes several adjusting bolts (41), one end of which is connected to the backrest frame (10) and the other end is connected to each backrest pad (301). By rotating the adjusting bolts (41), the backrest pads (301) are driven to move relative to the backrest frame (10).

6. The chair device with zoned adjustment function as described in claim 5, characterized in that, The adjusting bolt (41) is provided with a knob for easy manual operation, and a locking nut or elastic anti-loosening component is provided between the adjusting bolt (41) and the backrest frame (10) for maintaining a stable posture.

7. The chair device with zoned adjustment function as described in claim 1, characterized in that, The adjustable mechanism (40) includes a drive motor (43) and a transmission assembly (44). The drive motor (43) is electrically connected to the chair base (20) or the backrest frame (10), and its power output end is connected to the corresponding backrest cushion (301) through the transmission assembly (44) to drive the backrest cushion (301) to move relative to the backrest frame (10).

8. The chair device with zoned adjustment function as described in claim 7, characterized in that, The adjustable mechanism (40) also includes a controller (45), which is electrically connected to the drive motor (43) and is used to independently control the start and stop angle of each drive motor (43) so that each backrest cushion (301) forms a preset support surface in space.

9. The chair device with zoned adjustment function as described in claim 1, characterized in that, The backrest frame (10) is movably connected to the chair base (20) so that the backrest frame (10) can switch between an upright state for sitting and a reclining state for lying down relative to the chair base (20); in the reclining state, the backrest frame (10) is tilted at a large angle or laid flat relative to the chair base (20).

10. The chair device with zoned adjustment function as described in claim 9, characterized in that, When the backrest frame (10) switches from the upright state to the reclining state, the adjustable mechanism (40) can drive the multiple backrest cushions (301) to adjust their posture synchronously so that the spatial state of the backrest (30) can adapt to the human body's lying posture.

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