Office chair with multifunctional adjustable structure

Abstract

The invention belongs to the field of office chairs, and particularly relates to an office chair with a multifunctional adjustable structure, which comprises a chair seat, the chair seat comprises a movable chair seat and a positioning seat, the movable chair seat comprises a chair seat body and a multi-angle adjusting structure, and the chair seat body is assembled on the positioning seat through the multi-angle adjusting structure. The multi-angle adjusting structure is used for adjusting the relative displacement between the chair seat body and the positioning seat; the multi-angle adjusting structure comprises a limiting base and a plurality of telescopic pieces, and the telescopic pieces are distributed on the limiting base in an annular array mode. The chair seat body and the positioning seat are subjected to multi-angle adjustment through a plurality of telescopic pieces; when a user carries out asymmetrical posture adjustment of front-back and left-right composite inclination such as lateral turning, single-side leaning or body forward inclination typewriting, the sitting stability and comfort are improved through dynamic sitting posture adjustment, the chair seat body fully responds to complex and multi-dimensional real-time change of the gravity center of the human body, the pelvis of the user can be promoted to rotate, and the user can feel more comfortable. The buttocks and legs are correspondingly fine tuned to maintain stable support and pressure equalization.

Description

Technical Field

[0001] This invention relates to the field of office chairs, specifically to an office chair with a multi-functional adjustable structure. Background Technology

[0002] Office chairs, as a type of specialized seating widely applicable to offices, home offices, and various work environments, are designed with the core goal of providing users with stable and lasting support, and maximizing comfort and health during prolonged sitting. With the increasing popularity of ergonomics and the growing duration of modern office work, office chairs have evolved from basic load-bearing tools into important pieces of equipment integrating support, adjustability, and health care. Their design must not only meet the basic needs of static sitting postures but also dynamically adapt to the various posture changes and pressure distribution variations that occur during work, relieving back fatigue, promoting blood circulation, and thus improving work efficiency and health.

[0003] Current office chairs, especially mid-to-high-end ergonomic chairs, feature adjustable seats to enhance adaptability. Common adjustment mechanisms include fore-and-aft sliding adjustment of seat depth, allowing users to adjust the effective support area of ​​the seat cushion according to thigh length; individual or backrest-linked adjustment of seat tilt angle to change the seat angle for different sitting postures and work situations; and some products also offer options for seat cushion materials (such as high-elasticity foam or breathable mesh) and zoned pressure relief designs. These technologies aim to allow the seat to conform to the curves of the user's hips and legs to a certain extent, distributing pressure on the ischial tuberosities and providing initial support when the user leans back or performs other movements.

[0004] While existing office chair seat technology has achieved some basic adjustments, its adaptability and dynamic following capabilities still have significant limitations. A prominent issue is that existing adjustment functions are mostly single-dimensional or preset linkage modes, failing to fully respond to complex and multi-dimensional real-time changes in the user's center of gravity. For example, in a standard reclining posture, to maintain a close fit between the back and the backrest, the user's pelvis rotates, requiring the hips and legs to make corresponding forward and downward adjustments to maintain stable support and pressure balance. However, many chair seats have fixed or limited adjustment ranges, making it difficult to accurately adapt to this continuous change. More importantly, when users make asymmetrical posture adjustments, such as turning sideways, leaning to one side, or tilting forward while typing, existing chair seat structures typically cannot achieve corresponding adaptive adjustment of the local support surface. Its overall rigidity or simple linkage structure cannot sensitively sense and respond to the slight shifts in the center of gravity of the buttocks in the lateral and longitudinal directions, resulting in uneven pressure distribution between the seat support surface and the human body, sudden increase in local pressure, and easy pressure and discomfort in the thighs and buttocks. As a result, the stability and comfort under dynamic sitting posture are greatly reduced. This limitation reduces the chair's ability to adapt to diverse and dynamic working postures in all aspects, and fails to fully meet the deep-seated needs for continuous comfort and health support during long hours of office work. Summary of the Invention

[0005] Existing ergonomic chairs have limited seat adjustments. When a passenger leans back, the hips and legs need to adjust forward to accommodate the backrest; however, when a passenger tilts to the side or forward / backward, the seat cannot adequately adapt to the change in the center of gravity, reducing comfort. To address these issues, this invention provides the following technical solution: An office chair with a multi-functional adjustable structure includes a seat, which comprises a movable seat and a positioning seat, with the positioning seat mounted on the chair frame. The movable seat is mounted on the positioning seat and includes a seat body and a multi-angle adjustment structure. The multi-angle adjustment structure is mounted at the bottom of the seat body, and the seat body is mounted on the positioning seat via the multi-angle adjustment structure. The multi-angle adjustment structure is used to adjust the relative displacement between the seat body and the positioning seat. The multi-angle adjustment structure includes a limiting seat and multiple telescopic components. The limiting seat is inserted into the positioning seat, and the multiple telescopic components are arranged in a circular array on the limiting seat and are rotatably assembled with the limiting seat. The seat body and the positioning seat are adjusted at multiple angles via the multiple telescopic components. When a user sits on the movable seat, they sit directly on the seat body, and the seat body adjusts accordingly via the multiple telescopic components arranged in a circular array on the limiting seat included in the multi-angle adjustment structure. The adjustable range of angles allows for multi-angle adjustment between the seat and the positioning seat. This helps improve stability and comfort when users make asymmetrical posture adjustments, such as turning to the side, leaning to one side, or typing with their body tilted forward. The seat fully responds to the complex and multi-dimensional changes in the user's center of gravity in real time, causing the pelvis to rotate and the hips and legs to make corresponding minor adjustments to maintain stable support and pressure balance. This keeps the back and backrest in close contact, allowing for precise adaptation to this continuous change process and completing the corresponding local support surface adaptive adjustment. This avoids the situation where an overall rigid or simple linkage structure cannot sensitively detect and respond to the slight shifts in the center of gravity of the hips in the lateral and longitudinal directions, resulting in uneven pressure distribution between the seat support surface and the human body, sudden increases in local pressure, and feelings of pressure and discomfort in the thighs and hips.

[0006] Furthermore, the limiting seat includes a perimeter and a base. The perimeter is disposed above the base and the perimeter and the base are fixed as a single unit. The columnar center line of the perimeter and the columnar center line of the base are arranged on the same straight line. A cavity with a one-way opening is formed between the perimeter and the base. The perimeter and the base are interlocked and fixed on the positioning seat.

[0007] Furthermore, the limiting seat also includes a movable disk, which is movably placed inside the cavity and movably attached to the chassis. The surface of the chassis is smooth and the chassis is made of magnetic metal material. The end of the movable disk away from the chassis is fixed to the bottom of the chair seat.

[0008] Furthermore, a plurality of the telescopic components are arranged in a ring array in the cavity between the movable disk and the rim; one end of the telescopic component is rotatably mounted on the outer wall of the movable disk, and the other end is rotatably mounted on the inner wall of the rim.

[0009] Furthermore, the shape of the movable disk includes a cylinder and a prism; multiple sets of electromagnetic coils are laid on the end of the movable disk that is in contact with the chassis. By energizing the electromagnetic coils, the movable disk is magnetically attracted and limited to the chassis. By de-energizing the electromagnetic coils, the movable disk loses its magnetism and is released from its attraction and limitation to the chassis.

[0010] Furthermore, the telescopic component includes an outer sleeve and an insert rod, the insert rod being movably inserted inside the outer sleeve; both the end of the outer sleeve away from the insert rod and the end of the insert rod away from the outer sleeve are provided with hinges, the outer sleeve being rotatably mounted on the rim via the hinges; the insert rod being rotatably mounted on the movable disk via the hinges.

[0011] Furthermore, the telescopic component also includes a pusher disc and a spring. The pusher disc is assembled at the end of the insertion rod inside the outer sleeve. The pusher disc is slidably assembled inside the outer sleeve, with its outer surface adhering to the inner surface of the outer sleeve. The diameter of the pusher disc is larger than the diameter of the insertion rod. One end of the spring is connected to the pusher disc, and the other end is connected to the inside of the outer sleeve. The outer surfaces of the pusher disc, the insertion rod, and the inner surface of the outer sleeve are all smooth. A limit ring is provided at one end of the outer sleeve for the insertion rod to move through, and the outer surface of the insertion rod is adhering to the inner surface of the limit ring. An insertion cavity is provided inside the outer sleeve.

[0012] Furthermore, the hinge includes a U-shaped connecting plate and a positioning plate, with the positioning plate rotatably mounted on the U-shaped connecting plate via a positioning shaft.

[0013] Furthermore, the chair seat has a hip groove and two leg grooves, with the two leg grooves located on one side of the chair seat and both communicating with the hip groove.

[0014] Furthermore, the hip groove and the two leg grooves are all covered with sponge pads.

[0015] Compared with the prior art, the present invention can achieve the following: 1. When a user sits on the movable chair, they sit directly on the seat. The seat body, through a multi-angle adjustment structure containing multiple telescopic components arranged in a ring array on the positioning seat, can adjust to different degrees. This allows for multi-angle adjustment between the seat body and the positioning seat. This helps improve seating stability and comfort when the user makes asymmetrical posture adjustments such as turning to the side, leaning to one side, or leaning forward to type. The seat body fully responds to the complex and multi-dimensional real-time changes in the user's center of gravity, causing the pelvis to rotate and the hips and legs to make corresponding minor adjustments to maintain stable support and pressure balance. This keeps the back and backrest in close contact, which is conducive to accurately adapting to this continuous change process and completing the corresponding local support surface adaptive adjustment. This avoids the situation where an overall rigid or simple linkage structure cannot sensitively detect and respond to the slight shifts in the center of gravity of the hips in the lateral and longitudinal directions, resulting in uneven pressure distribution between the seat support surface and the human body, sudden increase in local pressure, and easy pressure and discomfort in the thighs and hips. 2. When the electromagnetic coil is de-energized, the moving disc loses its magnetism and is released from its magnetic attachment to the chassis. The chair seat then adjusts to varying degrees through multiple telescopic components arranged in a ring array. This multi-angle adjustment structure between the seat and the positioning seat allows for automatic seat movement. Subtle posture adjustments made unconsciously by the user immediately result in a comfortable fit from the seat support surface. This seamless self-adaptation significantly reduces the cognitive and operational burden of users having to interrupt their work to actively make mechanical adjustments for comfort. In dynamic sitting postures, the pressure points on the buttocks and thighs continuously change slightly. The elastic expansion and contraction of the telescopic components cause minute, periodic pressure changes at the interface between the seat and the body. This dynamic pressure redistribution helps promote blood circulation in the contact areas, preventing prolonged pressure on local blood vessels and further alleviating fatigue from prolonged sitting—a health benefit that traditional rigid or fixed cushions cannot achieve. When the seat can adjust its position in real time, it provides the user with a stable base that is always synchronized with changes in pelvic posture; it reduces the static contraction load of the lower limbs and core muscles in the waist and abdomen to maintain body balance, allowing the muscles to relax intermittently in dynamics, thereby reducing the risk of tension and strain on the musculoskeletal system from the root. 3. By energizing the electromagnetic coil, the moving disc is magnetically attracted and fixed to the chassis; by de-energizing the electromagnetic coil, the moving disc loses its magnetism and is released from its attachment and fixation to the chassis. This achieves instantaneous switching between adaptive adjustment mode and stable locking mode. This not only ensures flexibility in dynamic situations but also ensures that the seat can instantly transform into a solid rigid platform when the user needs absolute stable support. This dual characteristic of seamless switching between "dynamic" and "static" is difficult to achieve with a single mechanical structure, and it simultaneously satisfies the contradictory needs of dynamic comfort and static stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the office chair with a multi-functional adjustable structure according to the present invention; Figure 2 for Figure 1 Schematic diagram of the middle chair seat; Figure 3 for Figure 2 Demonstration diagram of the elastic movement of the middle chair seat (where A is a demonstration of elastic movement to the right rear, B is a static demonstration, and C is a demonstration of elastic movement to the left front). Figure 4 for Figure 2 A schematic diagram of the structure of the movable chair seat; Figure 5 for Figure 4 Schematic diagram of the middle chair seat; Figure 6 for Figure 4 A schematic diagram of the multi-angle adjustment structure; Figure 7 for Figure 6 The diagram shows the multi-angle adjustment structure adjusting in all directions (where D represents the movement of the moving disc upwards, E represents the movement of the moving disc to the upper left, F represents the movement of the moving disc to the lower left, G represents the movement of the moving disc downwards, H represents the movement of the moving disc to the lower right, and I represents the movement of the moving disc to the upper right). Figure 8 for Figure 6 Schematic diagram of the structure of the telescopic component; Figure 9 for Figure 8 Cross-sectional view of the telescopic component; Figure 10 for Figure 6 A cross-sectional view of the middle limit seat.

[0017] Legend: 1-Headrest, 2-Backrest, 3-Armrest, 4-Seat, 5-Five-star base; 41-Moving seat, 42-Positioning seat, 43-Seat body, 44-Multi-angle adjustment structure, 45-Limiting seat, 46-Telescopic component; 431-Buttock recess, 432-Leg recess; 451-Wall edge, 452-Base, 453-Moving plate; 461-Hinge, 462-Outer sleeve, 463-Intercepting rod, 464-Limiting ring, 465-Intercepting cavity, 466-Push plate, 467-Spring. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In embodiments of the present invention, such as Figures 1-7 As shown: An office chair with a multi-functional adjustable structure includes a seat 4, which includes a movable seat 41 and a positioning seat 42, with the positioning seat 42 mounted on the office chair frame. Regarding the "office chair frame," it should be added that: the office chair frame includes a backrest 2, the backrest 2 and seat 4 are mounted on a five-star base 5, an armrest 3 is installed on each side of the seat 4, and a headrest 1 is mounted on the top of the backrest 2; the headrest 1, backrest 2, armrest 3 and five-star base 5 are not described in detail because they are all existing technologies and can be purchased directly on the market or assembled by purchasing parts, etc. Whether they are publicly available or not does not affect the seat 4 that is to be protected, so they will not be elaborated on here. The movable chair seat 41 is mounted on the positioning seat 42. The movable chair seat 41 includes a seat body 43 and a multi-angle adjustment structure 44. The multi-angle adjustment structure 44 is mounted on the bottom of the seat body 43. The seat body 43 is mounted on the positioning seat 42 via the multi-angle adjustment structure 44. The multi-angle adjustment structure 44 is used to adjust the relative displacement between the seat body 43 and the positioning seat 42 (see details). Figure 3 Demonstration of A's elastic movement to the right and rear, and demonstration of C's elastic movement to the left and front; it should be noted that Figure 3 (This shows a portion of it). When a user sits on the movable seat 41, they will sit directly on the seat body 43. When the user makes asymmetrical posture adjustments such as turning to the side, leaning to one side, or leaning forward to type, the seat body 43 and the positioning seat 42 are adjusted in multiple angles through the multi-angle adjustment structure 44. This allows for dynamic posture adjustment, improving seating stability and comfort. The seat body 43 fully responds to complex and multi-dimensional changes in the human body's center of gravity in real time, causing the user's pelvis to rotate and the hips and legs to make corresponding minor adjustments to maintain stable support and pressure balance, keeping the back and backrest in contact. This helps to accurately adapt to this continuous change process and complete the corresponding local support surface adaptive adjustment. The multi-angle adjustment structure 44 includes a limiting seat 45 and multiple telescopic components 46. The limiting seat 45 is inserted and assembled on the positioning seat 42. The multiple telescopic components 46 are arranged in a circular array on the limiting seat 45 and are rotatably assembled with the limiting seat 45. The chair seat 43 and the positioning seat 42 are adjusted at multiple angles through the multiple telescopic components 46 (see details). Figure 7(D in the diagram represents the movement of the disc upwards, E represents the movement of the disc to the upper left, F represents the movement of the disc to the lower left, G represents the movement of the disc downwards, H represents the movement of the disc to the lower right, and I represents the movement of the disc to the upper right). When a user sits on the movable seat 41, they sit directly on the seat body 43. The seat body 43 adjusts to different degrees through multiple telescopic components 46 arranged in a ring array on the limiting seat 45, which are included in the multi-angle adjustment structure 44. This allows for multi-angle adjustment between the seat body 43 and the positioning seat 42. This helps improve seating stability and comfort when the user makes asymmetrical posture adjustments such as turning to the side, leaning to one side, or leaning forward to type. The seat body 43 fully responds to complex and multi-dimensional changes in the user's center of gravity in real time, causing the user's pelvis to rotate and the hips and legs to make corresponding minor adjustments to maintain stable support and pressure balance. This keeps the back and backrest in close contact, which is conducive to accurately adapting to this continuous change process and completing the corresponding local support surface adaptive adjustment. This avoids the situation where an overall rigid or simple linkage structure cannot sensitively sense and respond to the slight shifts in the center of gravity of the hips in the lateral and longitudinal directions, resulting in uneven pressure distribution between the seat cushion support surface and the human body, sudden increase in local pressure, and pressure and discomfort in the thighs and hips.

[0020] In embodiments of the present invention, such as Figure 6 and Figure 10 As shown: The limiting seat 45 includes a surrounding edge 451 and a base 452. The surrounding edge 451 is disposed above the base 452. The surrounding edge 451 and the base 452 are integrally fixed. The columnar center line of the surrounding edge 451 and the columnar center line of the base 452 are arranged on the same straight line. A cavity with a one-way opening is formed between the surrounding edge 451 and the base 452. The surrounding edge 451 and the base 452 are inserted and fixed on the positioning seat 42.

[0021] Furthermore, such as Figure 6 and Figure 10 As shown: The limiting seat 45 also includes a movable disk 453, which is movably placed inside the cavity and is movably attached to the base 452. The surface of the base 452 is smooth and the material of the base 452 is magnetic metal. The end of the movable disk 453 away from the base 452 is fixed to the bottom of the chair seat 43.

[0022] Magnetic metal materials are existing technology and can be purchased directly on the market or assembled by purchasing parts, such as iron; whether or not they are disclosed does not affect the seat 4 to be protected, and will not be elaborated on here.

[0023] In embodiments of the present invention, such as Figure 6 As shown: a plurality of telescopic components 46 are arranged in a ring array in the cavity between the movable disk 453 and the surrounding edge 451; one end of the telescopic component 46 is rotatably mounted on the outer wall of the movable disk 453, and the other end is rotatably mounted on the inner wall of the surrounding edge 451.

[0024] Furthermore, such as Figure 6 As shown: The shape of the movable disk 453 includes a cylinder and a prism; multiple sets of electromagnetic coils are laid on the end of the movable disk 453 that is in contact with the base plate 452. By energizing the electromagnetic coils, the movable disk 453 is magnetically attracted and limited to the base plate 452. By de-energizing the electromagnetic coils, the movable disk 453 loses its magnetism and is released from attraction and limitation on the base plate 452.

[0025] Electromagnetic coils and their wiring methods are existing technologies. Their detailed structures can be found in existing literature and journals, and they can also be purchased directly from the market or assembled from components purchased from the market. They are not the subject of this invention and will not be described in detail here, nor are they shown in the accompanying drawings.

[0026] In embodiments of the present invention, such as Figure 8 and Figure 9 As shown: The telescopic component 46 includes an outer sleeve 462 and an insert rod 463, the insert rod 463 being movably inserted inside the outer sleeve 462; both the end of the outer sleeve 462 away from the insert rod 463 and the end of the insert rod 463 away from the outer sleeve 462 are provided with hinges 461, the outer sleeve 462 being rotatably mounted on the rim 451 via the hinges 461; the insert rod 463 being rotatably mounted on the movable disk 453 via the hinges 461.

[0027] Furthermore, such as Figure 8 and Figure 9 As shown: The telescopic component 46 further includes a pusher disc 466 and a spring 467. The pusher disc 466 is assembled at the end of the insert rod 463 inside the outer sleeve 462. The pusher disc 466 is slidably assembled inside the outer sleeve 462, with its outer surface adhering to the inner surface of the outer sleeve 462. The diameter of the pusher disc 466 is set to be greater than the diameter of the insert rod 463. One end of the spring 467 is connected to the pusher disc 466, and the other end is connected to the inside of the outer sleeve 462. The outer surface of the push plate 466, the outer surface of the insertion rod 463, and the inner surface of the outer sleeve 462 are all smooth. A limit ring 464 is provided at one end of the outer sleeve 462 for the insertion rod 463 to move through. The outer surface of the insertion rod 463 is attached to the inner surface of the limit ring 464. An insertion cavity 465 is provided inside the outer sleeve 462.

[0028] like Figure 9As shown: The hinge 461 includes a U-shaped connecting plate and a positioning plate, and the positioning plate is rotatably mounted on the U-shaped connecting plate via a positioning shaft.

[0029] Therefore, when a user sits on the movable seat 41, they sit directly on the seat body 43. When the electromagnetic coil is de-energized, the movable disk 453 loses its magnetism, releasing its magnetic attraction and limiting position on the chassis 452. When the user performs asymmetrical posture adjustments such as turning sideways, leaning to one side, or typing with a forward lean, the movable disk 453 and the seat body 43 move synchronously, compressing multiple telescopic components 46 on one side of the movable disk 453 and stretching multiple telescopic components 46 on the other side. The telescopic components 46 move relative to the insert rod 463 and the outer sleeve 462, compressing or stretching the spring 467 to achieve elastic extension and contraction. This allows the seat body 43 to adjust to different degrees through the multiple telescopic components 46 arranged in a ring array on the limiting seat 45, included in the multi-angle adjustment structure 44. This completes the multi-angle adjustment between the seat body 43 and the positioning seat 42. 44 allows for multi-angle adjustment, and energizing the electromagnetic coil causes the movable disc 453 to magnetically adhere and be limited to the chassis 452. This helps improve seating stability and comfort when the user makes asymmetrical posture adjustments such as turning to the side, leaning to one side, or typing with the body leaning forward. The seat body 43 fully responds to complex and multi-dimensional real-time changes in the center of gravity of the human body, causing the user's pelvis to rotate and the hips and legs to make corresponding micro-adjustments to maintain stable support and pressure balance, keeping the back and backrest in contact. This facilitates precise adaptation to this continuous change process and completes the corresponding local support surface adaptive adjustment. It avoids the overall rigidity or simple linkage structure from failing to sensitively sense and respond to the slight shifts in the center of gravity of the hips in the lateral and longitudinal directions, resulting in uneven pressure distribution between the seat cushion support surface and the human body, sudden increase in local pressure, and easy pressure and discomfort in the thighs and hips.

[0030] In embodiments of the present invention, such as Figure 2 and Figure 5 As shown: The chair seat 43 has a buttock groove 431 and two leg grooves 432. The two leg grooves 432 are distributed on one side of the chair seat 43 and are connected to the buttock groove 431.

[0031] Furthermore, such as Figure 2 and Figure 5 As shown: The buttock groove 431 and the two leg grooves 432 are all covered with sponge pads.

[0032] In summary: when the electromagnetic coil is de-energized, the moving disk 453 loses its magnetism and is released from its magnetic attraction onto the chassis 452. The chair seat 43 then undergoes varying degrees of extension and retraction through multiple telescopic components 46 arranged in a circular array. This allows for multi-angle adjustment between the chair seat 43 and the positioning seat 42 via a multi-angle adjustment structure 44, enabling the chair seat 4 to move automatically. Subtle posture adjustments made unconsciously by the user immediately receive a conforming response from the support surface of the chair seat 4. This seamless self-adaptation greatly reduces the cognitive and operational burden on users who would interrupt their work to actively make mechanical adjustments in pursuit of comfort. In a dynamic sitting posture, the pressure points of the buttocks and thighs continuously change slightly. The elastic extension and contraction of the telescopic component 46 causes small, periodic pressure changes at the interface between the seat and the human body. This dynamic pressure redistribution helps promote blood circulation in the contact area and avoids local blood vessels being compressed for a long time. It further relieves fatigue from prolonged sitting from a physiological perspective, which is a health benefit that traditional rigid or fixed cushions cannot achieve. When the four sides of the seat can adjust to the center of gravity in real time, it provides the user with a stable base that is always synchronized with changes in pelvic posture; it reduces the static contraction load of the lower limbs and core muscles in the waist and abdomen to maintain body balance, allowing the muscles to relax intermittently in dynamics, thereby reducing the risk of tension and strain on the musculoskeletal system from the root.

[0033] By energizing the electromagnetic coil, the movable disc 453 is magnetically attracted and fixed to the chassis 452; by de-energizing the electromagnetic coil, the movable disc 453 loses its magnetism and is released from its attachment to the chassis 452. This achieves instantaneous switching between adaptive adjustment mode and stable locking mode. This not only ensures flexibility in dynamic situations but also ensures that when the user needs absolute stable support, the seat 4 can immediately transform into a solid rigid platform. This dual characteristic of freely switching between "dynamic" and "static" states is difficult to achieve with a single mechanical structure, and it simultaneously satisfies the contradictory needs of dynamic comfort and static stability.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An office chair with a multi-functional adjustable structure, comprising a seat (4), said seat (4) including a movable seat (41) and a positioning seat (42), the positioning seat (42) being mounted on the office chair frame; characterized in that, The movable chair seat (41) is mounted on the positioning seat (42). The movable chair seat (41) includes a chair body (43) and a multi-angle adjustment structure (44). The multi-angle adjustment structure (44) is mounted on the bottom of the chair body (43). The chair body (43) is mounted on the positioning seat (42) through the multi-angle adjustment structure (44). The multi-angle adjustment structure (44) is used to adjust the relative displacement between the chair body (43) and the positioning seat (42). The multi-angle adjustment structure (44) includes a limiting seat (45) and multiple telescopic components (46). The limiting seat (45) is interposed on the positioning seat (42), and the multiple telescopic components (46) are arranged in a ring array on the limiting seat (45) and rotatedly assembled with the limiting seat (45). The chair seat (43) and the positioning seat (42) are adjusted at multiple angles through the multiple telescopic components (46).

2. The office chair with a multi-functional adjustable structure according to claim 1, characterized in that, The limiting seat (45) includes a rim (451) and a base (452). The rim (451) is located above the base (452). The rim (451) and the base (452) are fixed as a single unit. The columnar center line of the rim (451) and the columnar center line of the base (452) are located on the same straight line. A cavity with a one-way opening is formed between the rim (451) and the base (452). The rim (451) and the base (452) are interlocked and fixed on the positioning seat (42).

3. The office chair with a multi-functional adjustable structure according to claim 2, characterized in that, The limiting seat (45) also includes a movable disk (453), which is movably placed inside the cavity and is movably attached to the base (452). The surface of the base (452) is smooth and the material of the base (452) is magnetic metal. The end of the movable disk (453) away from the base (452) is fixed to the bottom of the chair seat (43).

4. The office chair with a multi-functional adjustable structure according to claim 3, characterized in that, Multiple telescopic components (46) are arranged in a ring array in the cavity between the movable disk (453) and the rim (451); one end of the telescopic component (46) is rotatably mounted on the outer wall of the movable disk (453), and the other end is rotatably mounted on the inner wall of the rim (451).

5. The office chair with a multi-functional adjustable structure according to claim 3, characterized in that, The shape of the movable disk (453) includes a cylinder and a prism; multiple sets of electromagnetic coils are laid on the end of the movable disk (453) that is in contact with the base plate (452). By energizing the electromagnetic coils, the movable disk (453) is magnetically attracted and limited on the base plate (452). By de-energizing the electromagnetic coils, the movable disk (453) loses its magnetism and is released from attraction and limitation on the base plate (452).

6. The office chair with a multi-functional adjustable structure according to claim 3, characterized in that, The telescopic component (46) includes an outer sleeve (462) and an insert rod (463), the insert rod (463) being movably inserted inside the outer sleeve (462); both the end of the outer sleeve (462) away from the insert rod (463) and the end of the insert rod (463) away from the outer sleeve (462) are provided with hinges (461), the outer sleeve (462) is rotatably mounted on the rim (451) through the hinges (461); the insert rod (463) is rotatably mounted on the movable disk (453) through the hinges (461).

7. The office chair with a multi-functional adjustable structure according to claim 6, characterized in that, The telescopic component (46) also includes a push plate (466) and a spring (467). The push plate (466) is mounted on the end of the insert rod (463) inside the outer sleeve (462). The push plate (466) is slidably mounted inside the outer sleeve (462), and the outer surface of the push plate (466) is attached to the inner surface of the outer sleeve (462). The diameter of the push plate (466) is set to be greater than the diameter of the insert rod (463). One end of the spring (467) is connected to the push plate (466), and the other end is connected to the inside of the outer sleeve (462). The outer surface of the push plate (466), the outer surface of the insert rod (463), and the inner surface of the outer sleeve (462) are all smooth. A limit ring (464) is provided at one end of the outer sleeve (462) for the insert rod (463) to move through. The outer surface of the insert rod (463) is attached to the inner surface of the limit ring (464). An insertion cavity (465) is provided inside the outer sleeve (462).

8. The office chair with a multi-functional adjustable structure according to claim 7, characterized in that, The hinge (461) includes a U-shaped connecting plate and a positioning plate, with the positioning plate rotatably mounted on the U-shaped connecting plate via a positioning shaft.

9. The office chair with a multi-functional adjustable structure according to claim 1, characterized in that, The seat body (43) has a hip groove (431) and two leg grooves (432). The two leg grooves (432) are distributed on one side of the seat body (43) and are connected to the hip groove (431).

10. The office chair with a multi-functional adjustable structure according to claim 9, characterized in that, The buttock recess (431) and the two leg recesses (432) are all covered with sponge pads.

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