A type of interconnected office chair

Abstract

This invention discloses a linked office chair, comprising: a chair back that can rotate and provide sitting and reclining positions for the user; a neck pillow assembly movably connected to the chair back and capable of sinking and pushing forward relative to the chair back to accommodate different degrees of neck support; a lumbar support assembly movably connected to the chair back and capable of sinking and pushing forward relative to the chair back to provide different degrees of lumbar support for the user; and a linkage assembly that drives the neck pillow assembly and lumbar support assembly so that when the user sinks backward against the neck pillow assembly, the lumbar support assembly simultaneously pushes forward. The beneficial effect of this invention is that it solves the technical problem of discomfort caused by the user's lower back being unsupported in a reclining position in existing office chairs.

Description

Technical Field

[0001] This invention relates to a linkage office chair, specifically to the mechanical structure design of an office chair with ergonomic linkage adjustment function. Background Technology

[0002] Existing office chairs typically feature a swivel backrest, allowing users to adjust from an upright sitting posture to a reclining position to suit different needs such as work and rest. However, in actual use, when a user is in a reclining position, due to the natural curvature of the spine and the effect of gravity, a gap often forms between the lower back and the chair back, resulting in a lack of effective lumbar support and a suspended position. This unsupported lumbar position causes uneven stress on the lumbar spine, and maintaining this posture for extended periods can easily lead to lower back fatigue, soreness, and other discomfort, seriously affecting the user's rest quality and health. Although some office chairs on the market have lumbar support adjustment functions, these adjustments usually require manual operation by the user and cannot dynamically adjust in real time according to changes in body posture. Furthermore, the adjustment precision and adaptability are limited, failing to fundamentally solve the problem of insufficient lumbar support and the inability to adapt to a self-fitting posture when reclining, leaving significant room for improvement in the user experience. Summary of the Invention

[0003] The purpose of this invention is to provide a linkage office chair that solves the technical problem of discomfort caused by the user's lower back being unsupported when lying down in existing office chairs.

[0004] The present invention is achieved through the following technical solution.

[0005] A type of interconnected office chair, comprising:

[0006] The chair back can rotate and provide users with sitting and reclining positions;

[0007] The neck pillow assembly is movably connected to the backrest and can be tilted down and moved forward relative to the backrest to accommodate different degrees of neck support for the user.

[0008] The lumbar support component is movably connected to the chair back and can move downwards and forwards relative to the chair back to provide different levels of support for the user's lower back.

[0009] The linkage component drives the neck pillow component and the lumbar support component, so that when the user leans against the neck pillow component and moves backward, the lumbar support component moves forward synchronously.

[0010] As a further improvement of the present invention, the linkage component includes a traction rope and a plurality of drive wheels. One end of the traction rope is connected to the neck pillow assembly and the other end is connected to the lumbar support assembly. The plurality of drive wheels are arranged at intervals on the backrest along the direction of the traction rope and are connected to and tension the traction rope.

[0011] As a further improvement of the present invention, the linkage component also includes a ratio adjuster, which is configured to connect to the traction rope and can move when the neck pillow component sinks backward to drive the traction rope to move, so that the bending degree of the traction rope relative to the ratio adjuster gradually increases, and the increment suitable for the forward movement of the lumbar support component gradually increases with the increment of the backward movement of the neck pillow component.

[0012] As a further improvement of the present invention, the ratio adjuster has an oscillating structure with a defined axis of rotation, the far end of the oscillating structure away from its axis of rotation being connected to the traction rope.

[0013] As a further improvement of the present invention, the ratio adjuster is equipped with an elastic structure, which acts on the swing structure to drive the swing structure to rotate in a direction that reduces the bending of the traction rope.

[0014] As a further improvement of the present invention, the shift ratio adjuster includes an elastic strip, which is bent to form a swing structure, and its two ends continue to extend and are wound to form two torsion spring structures to constitute an elastic structure. The two torsion spring structures continue to extend and are constrained by the chair back. The rotation axis of the shift ratio adjuster is defined by the two torsion spring structures.

[0015] As a further improvement of the present invention, the top of the chair back has a neck pillow mounting seat and the middle has a lumbar support mounting seat. The neck pillow assembly includes a neck pillow and a neck pillow bracket connected to the neck pillow. The neck pillow bracket is slidably connected to the neck pillow mounting seat so that it can move downward and forward relative to the chair back. The lumbar support assembly includes a lumbar support and a lumbar support bracket connected to the lumbar support. The lumbar support bracket is slidably connected to the lumbar support mounting seat so that it can move downward and forward relative to the chair back. The neck pillow bracket is provided with a first connecting part for connecting one end of the traction rope, and the lumbar support bracket is provided with a second connecting part for connecting the other end of the traction rope.

[0016] As a further improvement of the present invention, the chair back includes a chair back frame, a chair back frame connected to the chair back frame and located in front of the chair back frame, a chair back layer with its edge connected to the chair back frame, a neck pillow mounting seat disposed at the top of the chair back frame, a lumbar support mounting seat disposed in the middle of the chair back frame and the lumbar support being supported on the back of the chair back layer, and a plurality of drive wheels disposed on the neck pillow mounting seat, the chair back frame and the lumbar support mounting seat.

[0017] As a further improvement of the present invention, the chair back frame has a resilience, and its top is connected to the top of the chair back frame. The lower left and right sides are provided with rearward extending insert rods. The chair back frame forms two side-extending brackets that correspond to the two insert rods respectively. The insert rods slide back and forth and are inserted into the corresponding side brackets.

[0018] As a further improvement of the invention, at least a portion of the outer sheath of the traction rope is covered with a protective tube.

[0019] The beneficial effects of this invention are:

[0020] By coordinating the backrest, neck pillow assembly, lumbar support assembly, and linkage components, the problem of lumbar sag when reclining in traditional office chairs is effectively solved. The neck pillow assembly is movably connected to the backrest and can move backward or forward relative to it to adapt to the different neck support needs of users. The lumbar support assembly is also movably connected to the backrest and provides differentiated support for the user's waist through downward and forward movements. When the user reclines into a reclining position, the pressure on the neck causes the neck pillow assembly to move backward, and the linkage components transmit this movement in real time and simultaneously drive the lumbar support assembly to move forward, so that the lumbar support closely conforms to the waist curve and prevents the waist from sagging and sag due to gravity. This synchronized linkage eliminates the need for manual adjustment by the user. The lumbar support automatically rises as the body reclines, providing stable support at all times. It not only eliminates the blind spots in the support of traditional office chairs when reclining, but also improves the overall riding comfort through dynamic response. In particular, it optimizes the lumbar support experience when the user is resting, achieving a seamless support transition from sitting to reclining. The introduction of a variable ratio adjuster in the linkage component further optimizes the support logic, so that the increase in the forward rise of the lumbar support increases with the increase in the backward sinking of the neck pillow. Small adjustments in the sitting position do not affect office operations, while the support travel is increased in the reclining position to match ergonomic needs. Attached Figure Description

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein:

[0022] Figure 1 This is a side view of the chair back.

[0023] Figure 2 This is a schematic diagram of the chair back structure;

[0024] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0025] Figure 4 This is a structural diagram of the linkage component;

[0026] Figure 5 This is a schematic diagram of the neck pillow support structure. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0028] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0029] This embodiment illustrates an office chair with a linkage mechanism that prevents the user's lower back from being unsupported when reclining, thus improving rest comfort. This linkage office chair, through the coordination of a mechanical structure, allows the neck pillow 21 and the lumbar support 31 to dynamically respond to each other, thereby solving the problem of insufficient lumbar support in traditional office chairs when reclining. (Refer to...) Figures 1-5 Specifically, the office chair includes a backrest 1, a neck pillow assembly 2, a lumbar support assembly 3, and a linkage assembly. The backrest 1 serves as the supporting frame of the entire chair, its bottom rotatably connected to the seat base, allowing the backrest 1 to rotate backward around a horizontal axis. This enables a smooth transition between an upright sitting posture for work and a reclining posture for rest, providing basic angle adjustment for different usage scenarios. The neck pillow assembly 2 is movably connected to the top area of ​​the backrest 1, allowing for backward and forward movement relative to the backrest 1. Backward movement refers to the neck pillow assembly 2 sinking downward and backward along the contour of the backrest 1 when subjected to pressure from the user's head or neck; forward movement is the opposite, pushing forward and upward. The lumbar support assembly 3 is movably connected to the middle area of ​​the backrest 1, also capable of backward and forward movement relative to the backrest 1, providing varying degrees of support to the user's lower back and filling the gap between the user's back and the backrest 1. The linkage component connects the neck pillow component 2 and the lumbar support component 3. When the user leans back into a reclining position, the weight of the head and neck naturally presses on the neck pillow component 2, causing it to sink backward. At this time, the linkage component converts this into driving force, synchronously driving the lumbar support component 3 to move forward. This synchronicity means that the user does not need to manually adjust the lumbar support 31; the lumbar support 31 will automatically rise upward with the body's backward movement, closely conforming to the user's lumbar curve. This effectively avoids the problem of the user's waist sagging due to gravity, allowing the lumbar support component 3 to consistently provide stable and comfortable support for the user's waist, greatly improving the overall experience when resting in a reclining position.

[0030] In this embodiment, to ensure the stability, accuracy, and durability of power transmission between the neck pillow assembly 2 and the lumbar support assembly 3, the linkage assembly adopts a structure combining a traction rope 41 and transmission wheels 42. Specifically, the linkage assembly includes a traction rope 41 and multiple transmission wheels 42. The traction rope 41 serves as the power transmission medium, with one end fixedly connected to the neck pillow assembly 2 and the other end fixedly connected to the lumbar support assembly 3, forming a direct tension transmission link. Multiple transmission wheels 42 are arranged at intervals on the frame structure of the chair back 1 along the intended path of the traction rope 41. These transmission wheels 42 function similarly to a pulley system; they not only provide a stable guiding path for the traction rope 41, ensuring that the traction rope 41 can extend smoothly inside or on the surface of the chair back 1 as intended, but more importantly, they work together to drive and tension the traction rope 41, preventing the traction rope 41 from becoming slack, slipping, or deviating from its track during operation. When the neck pillow assembly 2 moves backward under the pressure of the user's neck, it pulls one end of the traction rope 41 connected to it. The traction rope 41, under tension, passes around each transmission wheel 42, transmitting the tension seamlessly to the other end, thereby pulling the lumbar support assembly 3 forward. The advantage of this structure is that the traction rope 41 can flexibly bypass the complex internal structure of the chair back 1, occupying little space and having a concealed layout, without affecting the overall aesthetics of the office chair or the user's seating comfort. At the same time, the low rolling friction coefficient of the transmission wheels 42 ensures efficient power transmission, reduces energy loss, and allows even small displacements of the neck pillow assembly 2 to sensitively drive the lumbar support assembly 3 to respond. Furthermore, the distributed arrangement of multiple transmission wheels 42 evenly distributes the tension of the traction rope 41 across different positions on the chair back 1, avoiding localized stress concentration, improving the load-bearing capacity and service life of the entire linkage mechanism, and ensuring stable and reliable operation of the linkage function under various usage intensities.

[0031] In this embodiment, to further improve the adaptability of the linkage component and enable it to more accurately match the physiological curve changes of the human body in different postures, a ratio adjuster 43 is added to the linkage component. The ratio adjuster 43 is configured to be connected to the traction rope 41, and its introduction changes the simple linear motion mode of the traction rope 41. When the user is in a seated position, the body is relatively upright, and the pressure of the neck on the neck pillow component 2 is relatively light, so the neck pillow component 2 sinks back relatively little relative to the backrest 1. At this time, the function of the ratio adjuster 43 is to gradually change the degree of bending of the traction rope 41 at the corresponding point, thereby controlling the forward movement of the lumbar support component 3. Specifically, as the neck pillow component 2 sinks back to drive the traction rope 41 to move, the ratio adjuster 43 will move accordingly, causing the degree of bending of the traction rope 41 at its point of action to gradually increase. This increased degree of bending directly leads to a change in the relationship between the "increase in the backward movement of the neck pillow assembly 2" and the "increase in the forward movement of the lumbar support assembly 3." Instead, the increase in the forward movement of the lumbar support assembly 3 gradually increases with the increase in the backward movement of the neck pillow assembly 2. In a seated position, the slight backward movement of the neck pillow 21 only causes a small forward movement of the lumbar support 31, providing necessary lumbar support without excessively lifting the lumbar support and interfering with normal office work, thus maintaining the stability and comfort of the seated posture. However, when the user rotates the chair back 1 from a seated position to a reclining position, the pressure on the neck pillow 21 increases with the angle of backward tilt, resulting in a greater backward movement of the neck pillow 21. At this point, the ratio regulator 43 begins to amplify the upward movement of the lumbar support assembly 3. This is analogous to using a small input force (the downward movement of the neck pillow 21) to pry open a large output displacement (the upward movement of the lumbar support 31), achieving the effect of "compensating for a large movement with a small stroke." This non-linear linkage perfectly matches the natural physiological needs of the human spine during backward extension, where the lumbar region requires increasingly stronger support and greater support displacement, thus providing users with the most fitting and comfortable lumbar support in different postures.

[0032] In this embodiment, based on considerations of simplifying the structure of the gear ratio adjuster 43, reducing manufacturing difficulty, and improving its operational reliability, the gear ratio adjuster 43 has a swing structure 431. This swing structure 431 is defined as having a rotation axis, which serves as the reference for its swing during operation. The far end of the swing structure 431, away from its rotation axis, i.e., its free end, is connected to the traction rope 41. In the non-operating state, i.e., when the neck pillow assembly 2 does not sink back relative to the chair back 1, the portion of the traction rope 41 corresponding to the swing structure 431 remains essentially straight, and the swing structure 431 is in its initial equilibrium position. When the user leans against the neck pillow assembly 2 to sink back, the traction rope 41 is pulled, and its tension acts on the far end of the swing structure 431, causing the swing structure 431 to begin rotating around its rotation axis. As the swing structure 431 rotates, the originally straight traction rope 41 gradually bends at that point, with the degree of bending increasing from zero to significant. Because of the swing structure 431, the amount of movement of the traction rope 41 changes as its swing angle increases. This change is converted into a non-linear increase in the displacement of the lumbar support assembly 3. This swing structure 431 design makes the motion of the ratio adjuster 43 simple and intuitive, and ensures good motion accuracy and stability during long-term use, preventing jamming or damage, thus providing a solid guarantee for the long-term reliability of the entire linkage function.

[0033] In this embodiment, to further enhance the user experience and ensure that the linkage mechanism can automatically reset and optimize force feedback, the ratio adjuster 43 is also specially equipped with an elastic structure 432. This elastic structure 432 acts directly on the aforementioned swing structure 431, providing it with a continuous restoring force. The direction of action of the elastic structure 432 is set to drive the swing structure 431 to rotate in the direction that reduces the bending degree of the traction rope 41. When the user's neck is no longer against the neck pillow assembly 2, or when the user leaves the seat, the neck pillow assembly 2 is no longer under downward pressure. At this time, the accumulated force of the elastic structure 432 is released, driving the swing structure 431 to rotate in the opposite direction, thereby causing the traction rope 41 to reset. Ultimately, both the neck pillow assembly 2 and the lumbar support assembly 3 return to their initial, non-working positions, ensuring that the office chair automatically returns to its standard posture after each use, ready for the next adjustment, without requiring manual return by the user, thus improving ease of use. Furthermore, the elastic force generated by the elastic structure 432 constitutes the resistance to the backward movement of the neck pillow assembly 2 relative to the backrest 1. When the user wants to recline the backrest 1 into a lying position, their neck not only needs to overcome its own weight but also the resistance transmitted by the elastic structure 432 through the linkage mechanism. This provides a textured "damping feel," making the backward reclining process of the backrest 1 more stable and controllable, avoiding the insecurity caused by sudden and rapid backward falls. Moreover, as the neck pillow assembly 2 continues to sink downward in the lying position, the angle of the swing structure 431 becomes larger and larger, and the deformation of the elastic structure 432 also increases accordingly, generating a gradual increase in resistance. This allows the user to feel a layered support force that progresses from light to heavy during the backward reclining process, further enhancing the comfort of the product.

[0034] In this embodiment, based on the consideration of pursuing a compact structure, high component integration, and excellent mechanical properties, the gear ratio adjuster 43 adopts a highly innovative integrated molding structure, specifically including an elastic strip, a swing structure 431, and a torsion spring structure. Specifically, the gear ratio adjuster 43 includes an elastic strip, which, through a bending process, forms the aforementioned swing structure 431. This arrangement, using the elastic material itself as the swing structure 431, eliminates the need for additional connecting parts, resulting in an exceptionally simple structure. The two ends of the elastic strip continue to extend outwards and, after being wound, form two helical torsion spring structures. These two torsion spring structures constitute the aforementioned elastic structure 432. The two torsion spring structures continue to extend outwards, and these extensions are ultimately constrained and fixed by the frame structure of the chair back 1. In this arrangement, the rotation axis of the gear ratio adjuster 43 is precisely defined by the two torsion spring structures. Because torsion springs can undergo torsional deformation under stress, they not only fix the pivot of the swing structure 431, but also provide elastic torque to reset the swing structure 431. This "multi-purpose material" design concept greatly simplifies the number of parts in the ratio regulator 43, reduces assembly complexity, and improves production efficiency. Furthermore, since the entire ratio regulator 43 can be integrally formed from a single metal wire or sheet through processes such as stamping, bending, and winding, it boasts high material utilization, low cost, and excellent fatigue strength and durability.

[0035] In this embodiment, to further clarify the specific installation methods of the neck pillow assembly 2 and the lumbar support assembly 3 and their relative movement relationship with the chair back 1, the structure of the chair back 1 and the two assemblies has been refined. The top of the chair back 1 has a neck pillow mounting seat 13 specifically for mounting the neck pillow 21, and the middle part has a lumbar support mounting seat 14 for mounting the lumbar support 31. The neck pillow assembly 2 includes a neck pillow 21 that directly contacts the user's neck, and a neck pillow bracket 22 that connects to the neck pillow 21. The neck pillow bracket 22 is slidably connected to the neck pillow mounting seat 13 via a slide rail, slide groove, or other linear guide mechanism. This sliding connection ensures that the neck pillow assembly 2 can accurately move backward and forward relative to the chair back 1 without tilting or jamming. Similarly, the lumbar support assembly 3 includes a lumbar support 31 that directly contacts the user's waist, and a lumbar support bracket 32 ​​that connects to the lumbar support 31. The lumbar support bracket 32 ​​is also mounted on the lumbar support mounting seat 14 via a similar sliding connection, ensuring the linearity and smoothness of its movement. The neck pillow support 22 is provided with a first connecting part 221 for connecting one end of the traction rope 41; the lumbar support support 32 is provided with a second connecting part 321 for connecting the other end of the traction rope 41.

[0036] In this embodiment, the chair back 1 adopts a split-combination structure, specifically including a chair back frame 11, a chair back frame 12, and a chair back layer (not shown in the figure). The chair back frame 11 is the main load-bearing skeleton of the entire chair back 1, usually made of metal, with extremely high strength and rigidity, responsible for bearing the entire weight of the user's body and various forces generated when the linkage components are working. The chair back frame 12 is connected to the front of the chair back frame 11 and is used to shape the overall appearance of the chair back 1. The chair back layer is a soft fabric layer (such as mesh), whose edges are connected to the chair back frame 12, directly facing the user, providing a comfortable touch. As before, the neck pillow mounting seat 13 is located at the top of the chair back frame 11, the lumbar support mounting seat 14 is located in the middle of the chair back frame 11, and the lumbar support 31 itself is supported on the back of the chair back layer, so that the supporting force of the lumbar support 31 can be evenly transmitted to the user through the chair back layer. Multiple drive wheels 42 are strategically positioned on the neck pillow mounting base 13, the backrest frame 11, and the lumbar support mounting base 14. This fully utilizes the internal space of the backrest frame 11 to arrange the path of the traction rope 41, effectively concealing the entire linkage mechanism within or behind the backrest 1 without compromising the seat's aesthetics or comfort. This split design separates the load-bearing structure from the exterior decoration, ensuring both strength and aesthetics, while also providing ample and reasonable installation space for the complex linkage mechanism.

[0037] In this embodiment, the backrest frame 12 is typically made of an engineering plastic or composite material with good elasticity. Its top is fixedly connected to the top of the backrest frame 11. In the lower middle part of the backrest frame 12, rearwardly extending inserts 121 are provided on both its left and right sides. Correspondingly, the backrest frame 11 forms two side-extending brackets 111, which correspond to the positions of the two inserts 121. The inserts 121 slide back and forth into their respective side-extending brackets 111. This arrangement allows the lower part of the backrest frame 12 to undergo a certain elastic deformation and backward displacement relative to the rigid backrest frame 11 when subjected to pressure from the user's back. When the user leans back, the back force acts on the backrest frame 12, the inserts 121 slide backward within the side-extending brackets 111, and the backrest frame 12 undergoes elastic bending, thereby absorbing the impact and providing a gentle support. This structure ensures that the backrest 1 has sufficient support, while also providing a spring-like feeling of envelopment and cushioning, thus improving the comfort of the seat. It also provides a more stable and flexible base platform for the operation of the lumbar support component 3.

[0038] In this embodiment, to protect the traction rope 41 from wear, extend its service life, and ensure smooth and silent operation, at least a portion of the outer surface of the traction rope 41 is fitted with a protective tube 411. The protective tube 411 is typically made of a wear-resistant, low-friction material, such as nylon, polytetrafluoroethylene, or a spiral steel wire sheath. The main function of the protective tube 411 is to isolate the traction rope 41 from the hard metal or plastic components inside the chair back 1, preventing the traction rope 41 from wearing down, fraying, or even breaking due to friction with these components during long-term reciprocating motion.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A type of interconnected office chair, characterized in that, include: The chair back can rotate and provide users with sitting and reclining positions; The neck pillow assembly is movably connected to the backrest and can be moved downwards and forwards relative to the backrest to accommodate different degrees of neck support for the user. The lumbar support assembly is movably connected to the chair back and can be moved downwards and forwards relative to the chair back to provide different degrees of support to the user's lumbar region. The linkage component drives the neck pillow assembly and the lumbar support assembly so that when the user leans against the neck pillow assembly and moves backward, the lumbar support assembly moves forward synchronously.

2. The linked office chair according to claim 1, characterized in that, The linkage assembly includes a traction rope and multiple drive wheels. One end of the traction rope is connected to the neck pillow assembly, and the other end is connected to the lumbar support assembly. The multiple drive wheels are arranged at intervals on the backrest along the direction of the traction rope, and are connected to and tension the traction rope.

3. The linked office chair according to claim 2, characterized in that, The linkage component also includes a ratio adjuster, which is configured to connect to the traction rope and can move when the neck pillow assembly sinks backward to drive the traction rope to move, so that the bending degree of the traction rope at the ratio adjuster gradually increases, and the increment of the forward movement of the lumbar support assembly gradually increases with the increment of the backward movement of the neck pillow assembly.

4. The linked office chair according to claim 3, characterized in that, The ratio adjuster has an oscillating structure with a defined axis of rotation, the far end of which is connected to the traction rope.

5. The linked office chair according to claim 4, characterized in that, The ratio adjuster is equipped with an elastic structure that acts on the swing structure to drive the swing structure to rotate in a direction that reduces the bending of the traction rope.

6. The linked office chair according to claim 5, characterized in that, The gear ratio adjuster includes an elastic bar that is bent to form a swing structure, and its two ends continue to extend and coil to form two torsion spring structures to constitute the elastic structure. The two torsion spring structures continue to extend and are constrained by the chair back. The rotation axis of the gear ratio adjuster is defined by the two torsion spring structures.

7. The linked office chair according to claim 3, characterized in that, The chair back has a neck pillow mounting seat at the top and a lumbar support mounting seat in the middle. The neck pillow assembly includes a neck pillow and a neck pillow bracket connected to the neck pillow. The neck pillow bracket is slidably connected to the neck pillow mounting seat so that it can move downwards and forwards relative to the chair back. The lumbar support assembly includes a lumbar support and a lumbar support bracket connected to the lumbar support. The lumbar support bracket is slidably connected to the lumbar support mounting seat so that it can move downwards and forwards relative to the chair back. The neck pillow bracket is provided with a first connecting part connected to one end of the traction rope, and the lumbar support bracket is provided with a second connecting part connected to the other end of the traction rope.

8. The linked office chair according to claim 6, characterized in that, The chair back includes a chair back frame, a chair back frame connected to the chair back frame and located in front of the chair back frame, and a chair back layer with its edges connected to the chair back frame. The neck pillow assembly is located at the top of the chair back frame, and the lumbar support assembly is located in the middle of the chair back frame and the lumbar support is supported on the back of the chair back layer. A plurality of the drive wheels are arranged on the neck pillow assembly, the chair back frame and the lumbar support assembly.

9. The linked office chair according to claim 8, characterized in that, The chair back frame is resilient, and its top is connected to the top of the chair back frame. The lower left and right sides are provided with rearward extending inserts. The chair back frame forms two side-extending brackets that correspond to the two inserts respectively. The inserts slide back and forth into the corresponding side brackets.

10. The linked office chair according to claim 3, characterized in that, The traction rope has a protective tube covering at least a portion of its outer sheath.

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