Linkage type office chair

Abstract

The invention discloses a linkage type office chair. The linkage type office chair comprises a base assembly; the front end of the chair seat is rotationally connected to the front end of the base assembly; the bottom end of the backrest is rotationally connected to the rear end of the base assembly; one end of the seat connecting rod is rotationally connected to the rear side of the bottom of the seat, and the other end of the seat connecting rod is movably connected to the base assembly, so that the seat rotates around the front end of the base assembly; the backrest elastic rod has elastic contraction performance, one end of the backrest elastic rod is rotationally connected to the lower portion of the backrest, the other end of the backrest elastic rod is movably connected to the base assembly, and the backrest elastic rod is suitable for being gradually stretched in a reduced amplitude when the backrest rotates in a back-leaning mode; and the linkage piece, the seat connecting rod and the backrest elastic rod are connected to the parts of the base assembly, so that the seat synchronously and obliquely rotates downwards from front to back when the backrest leans backwards and rotates from the initial position. The chair has the beneficial effects that the cooperative movement of the backrest and the chair seat can be realized, and the backward leaning comfort and the ergonomic supporting effect are improved.

Description

Technical Field

[0001] This invention relates to a linked office chair, belonging to the technical field of office chairs. Background Technology

[0002] Traditional chairs, especially office or lounge chairs, often feature a reclining backrest to enhance comfort. However, in most existing designs, the seat typically remains fixed horizontally or only slightly tilted when the backrest is reclined. This design has the following drawbacks: when reclining, the user's body tends to slide forward along the fixed seat surface, reducing the effective contact area between the buttocks and the seat, creating a gap between the lumbar region and the backrest, and failing to provide continuous, supportive support for the lumbar spine. This not only reduces the comfort and stability of reclining but also easily leads to poor posture, increasing lumbar pressure and fatigue. Summary of the Invention

[0003] The purpose of this invention is to provide a linkage office chair that enables coordinated movement of the backrest and seat, improving reclining comfort and ergonomic support.

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

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

[0006] Base components;

[0007] The seat, the front end of which is rotatably connected to the front end of the base component;

[0008] The backrest is rotatably connected to the rear end of the base assembly.

[0009] A seat connecting rod, one end of which is rotatably connected to the rear bottom of the seat and the other end is movably connected to the base assembly, is adapted to allow the seat to rotate about the front end of the base assembly.

[0010] The backrest elastic rod has elastic retraction properties. One end is rotatably connected to the lower part of the backrest, and the other end is movably connected to the base assembly. It is suitable for being gradually stretched with a reduced amplitude when the backrest is tilted back and rotated.

[0011] The linkage, which connects the seat connecting rod and the backrest elastic rod to the base assembly, is adapted to allow the seat to tilt downward synchronously from front to back when the backrest rotates backward from its initial position.

[0012] As a further improvement of the present invention, a limiting part is provided on the base assembly to block the movement of the seat connecting rod and / or the backrest elastic rod, which is triggered during the backrest tilting and rotation, and is suitable for the backrest elastic rod to be gradually stretched at a normal amplitude after triggering.

[0013] As a further improvement of the present invention, the base assembly has two lugs arranged at left and right intervals, each lug having an arc-shaped groove. The seat connecting rod and the backrest elastic rod are located between the two lugs, and both have insert rods on both sides that pass through the corresponding grooves and can slide along the grooves.

[0014] As a further improvement of the present invention, when the backrest is in the initial state, the insert corresponding to the seat connecting rod abuts against the front end of the slide groove, and the rear end of the slide groove forms a limiting part, which is used to abut against the insert corresponding to the backrest elastic rod during the backrest tilting and rotating.

[0015] As a further improvement of the invention, a locking mechanism is also included for locking the backrest in its initial state so that it cannot rotate around the backrest, or for unlocking it to allow it to rotate around the backrest.

[0016] As a further improvement of the present invention, the linkage includes two connecting rods located on the outer sides of the two lugs respectively, and the two ends of the connecting rods are respectively rotatably sleeved on the two insert rods corresponding to the seat connecting rod and the backrest elastic rod located on the same side.

[0017] As a further improvement of the present invention, the backrest elastic rod includes a cylinder rotatably connected to the backrest, a rod movably connected to the base assembly, and an elastic member. The rod slides into the cylinder from the end of the cylinder away from the backrest, and the end of the rod that enters the cylinder has a support structure. The two ends of the elastic member support the support structure and the end of the cylinder away from the backrest, respectively, and are arranged around the rod.

[0018] As a further improvement of the present invention, the base assembly includes a base and a base plate. The base has positioning shafts extending to the left and right on both sides. The base plate has fixing sleeves on both sides of the middle part that are sleeved and fixed on the two positioning shafts. The front end of the base plate is rotatably connected to the front end of the chair seat, and the rear end of the base plate is rotatably connected to the bottom end of the backrest.

[0019] As a further improvement of the present invention, a vertically extending gas spring is connected to the bottom of the base, and the bottom end of the gas spring is connected to the chassis.

[0020] The beneficial effects of this invention are:

[0021] When the user leans back, the raised front of the seat effectively supports the upper thigh area, creating upward support and stabilizing the posture. The lowered rear of the seat allows the user's pelvic area to naturally tilt slightly backward, causing the lower lumbar spine to more naturally conform to the pre-designed physiological curve of the backrest. This reduces the unsupported area between the lower back and the backrest that often occurs when leaning back with a traditional fixed seat. Therefore, the pressure on the lumbar spine is more evenly distributed across the entire backrest, rather than concentrated in a few points, significantly reducing the risk of lower back muscle fatigue and intervertebral disc strain caused by maintaining an improper posture for a long time.

[0022] Because its connection point is movable and its extension range is reduced, the elastic bar provides a smoother curve of elastic force (i.e., rotational resistance) to resist the backward tilting during the initial and middle stages of the backrest tilting. This makes the user feel smoother and more linear when applying force to start tilting back and adjusting the angle throughout the tilting process, without obvious stage-by-stage stutters or sudden increases in resistance, thus improving the smoothness and controllability of the operation. Attached Figure Description

[0023] 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:

[0024] Figure 1 This is a side view of a linked office chair.

[0025] Figure 2 This is a structural diagram of the lug, seat connecting rod, backrest elastic rod, and linkage components.

[0026] Figure 3 This is a cross-sectional view of the backrest elastic rod. 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 a linked office chair, with reference to... Figures 1-3The office chair includes a base component 1 for basic support, a seat 2 for the user to sit on, and a backrest 3 for back support. The front end of the seat 2 is rotatably connected to the front end of the base component 1, allowing it to rotate around the front end. The bottom end of the backrest 3 is rotatably connected to the rear end of the base component 1, enabling it to tilt backward and forward around the rear end. This embodiment of the office chair also includes a seat connecting rod 41, a backrest elastic rod 42, and a linkage 43. One end of the seat connecting rod 41 is rotatably connected to the bottom rear position of the seat 2, while the other end is movably connected to the base component 1. This connection allows the seat 2 to rotate around its connection point with the front end of the base component 1 when the connection point moves on the base component 1. The backrest elastic rod 42 has elastic contraction properties. One end is rotatably connected to the lower part of the backrest 3, and the other end is movably connected to the base assembly 1. The main function of the backrest elastic rod 42 is to provide the elastic force to make the backrest 3 return to its original position by tilting forward, and to provide a certain rotational resistance during the tilting process of the backrest 3. Since its connection point can move on the base assembly 1, when the backrest 3 tilts backward, the elastic rod is stretched by a smaller amount compared to when its connection point is fixed. This means that under the same rotation angle of the backrest 3, the actual elongation of the elastic rod is smaller. Linkage 43 connects the movable connection part of the seat connecting rod 41 on the base assembly 1 and the movable connection part of the backrest elastic rod 42 on the base assembly 1. Through this linkage 43, when the user leans back, forcing the backrest 3 to start rotating backward from the initial position (i.e., the position when the user sits upright and no pressure is applied to the backrest 3), the linkage 43 will synchronously drive the movement of the seat connecting rod 41, thereby causing the seat 2 to produce a specific movement: rotating downward from front to back, that is, the front end of the seat 2 rises and the rear end lowers, forming a tilted posture with the front higher and the back lower.

[0030] This interconnected design brings a series of significant ergonomic benefits. When the user leans back, the front of the seat 2 rises to effectively support the user's groin area, creating upward support. This directly counteracts the tendency for the user's buttocks to slide forward along the seat due to the shift in the body's center of gravity and inertia, thus stabilizing the sitting posture. At the same time, the lowering of the rear of the seat 2 allows the user's pelvic area to naturally tilt slightly backward, prompting the lower lumbar spine to more naturally conform to the pre-designed physiological curve of the backrest 3. This reduces the unsupported area between the lumbar region and the backrest 3 that often occurs when the seat is tilted back in a traditional fixed position. Therefore, the pressure on the lumbar spine is more evenly distributed across the entire backrest 3, rather than concentrated in a few points, significantly reducing the risk of lumbar muscle fatigue and intervertebral disc strain caused by maintaining an improper sitting posture for a long time. In terms of overall sitting comfort, due to the active adaptation of the seat 2's posture, the contact area between the user's buttocks and the seat is maintained or even optimized, resulting in a more even pressure distribution. This avoids the "slippage" that users often experience when leaning back in a regular office chair, or the "instability" caused by having to actively lean forward to resist the slippage. Therefore, the user's sitting posture is more relaxed and stable, truly achieving the purpose of leaning back and resting.

[0031] Furthermore, because the connection point of the backrest elastic rod 42 is movable and the range of extension is reduced, the growth curve of the elastic force (i.e., rotational resistance) provided by the elastic rod to resist the backward tilt is more gradual in the initial and middle stages of the backrest 3 tilting backward. This makes it feel smoother and more linear when the user applies force to start tilting backward and adjusts the angle throughout the tilting process, without obvious stage-by-stage stutters or sudden increases in resistance, thus improving the smoothness and controllability of the operation.

[0032] In this embodiment, a limiting part a is provided on the base assembly 1. This limiting part a is configured to block the movement of the seat connecting rod 41 and / or the backrest elastic rod 42 on the base assembly 1 during the backward rotation of the backrest 3. Specifically, when the backrest 3 begins to recline from its initial position, the linkage 43 causes the moving ends of the seat connecting rod 41 and the backrest elastic rod 42 to slide on the base assembly 1. At this time, the limiting part a does not function. As the reclining angle increases, the moving ends will contact the preset limiting part a and be blocked by it, unable to continue moving along the original path. Before the limiting part a is triggered, the connection point of the backrest elastic rod 42 can move freely, and its stretching range is in a "reduced" state. After the limiting part a is triggered, the movement is blocked, and the connection point of the backrest elastic rod 42 is essentially transformed into a "fixed" state. After that, if the user continues to lean back, the elastic rod will be stretched gradually with a "normal range" (i.e., the same range as when its connection point is completely fixed). This establishes a two-stage leaning resistance characteristic: In the first stage (small to medium angle leaning back), the resistance increases gradually, making it easy for the user to enter a relaxed leaning state, and the seat 2 tilts synchronously to provide good support. In the second stage (larger angle leaning back), when the limiting part a is triggered, the resistance growth curve becomes steep. When the user leans back to a larger angle, the steep increase in resistance provides stronger feedback and a more solid sense of support, as if there is a "hard stop" reminding and preventing excessive leaning back, increasing the safety and stability of the posture. The limiting part a is designed to meet the support stiffness requirements during deep relaxation and provide stronger assistance when the user gets up, ensuring the convenience and efficiency of returning from a relaxed posture to an office posture.

[0033] In this embodiment, the base assembly 1 has two lugs 13 arranged at a certain distance in the left-right direction. These two lugs 13 are typically plate-shaped or block-shaped structures extending upward from the main body of the base assembly 1. Each lug 13 has an arc-shaped groove 131, and the positions of the two grooves 131 correspond to each other. The main body of the seat connecting rod 41 and the backrest elastic rod 42 are located in the space between the two lugs 13. At the two ends of the seat connecting rod 41 and at the corresponding positions of the movable end of the backrest elastic rod 42, there are horizontally extending inserts 44. These inserts 44 pass through the corresponding arc-shaped grooves 131 on the left and right lugs 13 and can slide freely within the arc-shaped track of the grooves 131. This configuration not only enables the movable connection between the seat connecting rod 41 and the backrest elastic rod 42 and the base assembly 1 (by sliding the insert rod 44 in the slide groove 131), but also precisely constrains and guides the movement path through the arcuate profile of the slide groove 131, ensuring the smoothness of the movement and the predetermined trajectory.

[0034] In this embodiment, when the backrest 3 is in the aforementioned initial state, the two insert rods 44 corresponding to the seat connecting rod 41 are positioned within the slide groove 131, abutting against the front end of the slide groove 131, and the rear end of the slide groove 131 forms a limiting part a. The working process is as follows: when the backrest 3 tilts back and rotates, the linkage 43 drives the insert rod 44 corresponding to the backrest elastic rod 42 to slide backward from a certain starting position within the slide groove 131. At a certain preset tilting angle, the insert rod 44 slides to the rear end of the slide groove 131 and abuts against it. Due to the obstruction at the rear end of the slide groove 131, the insert rod 44 corresponding to the backrest elastic rod 42 cannot continue to slide backward, thus triggering the previously described second stage—the backrest elastic rod 42 is stretched to its normal range.

[0035] In this embodiment, a locking mechanism (not shown in the figure) is also included to lock the backrest 3 in its initial state, preventing it from rotating backward, or to unlock it to allow it to rotate backward. Normally, the user locks the backrest using the locking mechanism while working and unlocks it when they need to relax. Optionally, a pivot is provided at the rear end of the base assembly, with both sides of the bottom end of the backrest rotatably fitted onto this pivot. A locking rod that can slide axially is slidably inserted at the center of one or both ends of the pivot. The outer end of the locking rod is connected to a radially extending locking bolt. Locking grooves matching the shape of the locking bolt can be provided on both sides of the pivot corresponding to the backrest. When the backrest is in its initial state, the position of the locking groove corresponds exactly to the locking bolt. The user can pull the locking bolt to extend or retract the locking rod, causing the locking bolt to engage with the locking groove and lock the backrest, or the locking bolt and locking groove can be separated to unlock the backrest. Other different structures can also be selected to lock and unlock the backrest's rotation through mechanical locking. Such existing technologies are numerous and will not be described in detail here.

[0036] In this embodiment, the linkage 43 specifically includes two connecting rods 431 located on the outer sides of the two lugs 13. Each connecting rod 431 has shaft holes at both ends, and is rotatably sleeved on two insert rods 44 located on the same side: the insert rod 44 of the seat connecting rod 41 on this side, and the insert rod 44 of the backrest elastic rod 42 on this side. In this way, the insert rod 44 of the seat connecting rod 41, the insert rod 44 of the backrest elastic rod 42, and the connecting rods 431 form a double rocker mechanism or a similar variable quadrilateral structure on each side, preventing jamming or abnormal noise caused by uneven force on one side.

[0037] In this embodiment, the backrest elastic rod 42 includes a cylinder 421, a rod 422, and an elastic element 423. One end of the cylinder 421 is rotatably connected to the lower part of the backrest 3, and the rod 422 is movably connected to the base assembly 1. The rod 422 slides into the internal cavity of the cylinder 421 from the end of the cylinder 421 away from the backrest 3. At the end of the rod 422 that penetrates the cylinder 421, a support structure 424 is provided. The elastic element 423 (usually a helical compression spring) is sleeved on the outside of the rod 422 and accommodated inside the cylinder 421. The two ends of the elastic element 423 respectively support the support structure 424 and the end of the inner wall of the cylinder away from the backrest 3. When the backrest 3 tilts back, the linkage mechanism forces the rod 422 to pull outward relative to the cylinder 421. The support structure 424 compresses the elastic element 423, thereby generating a restoring force that causes the rod 422 to retract into the cylinder 421. This force is transmitted to the backrest 3 and manifests as a torque and rotational resistance that causes it to tilt forward and return to its original position.

[0038] In this embodiment, the base assembly 1 includes two parts: a base 11 and a base plate 12. The base 11 forms the bottom support frame of the entire seat, and two lugs 13 are formed on the top of the base 11. Positioning shafts 111 extending horizontally to the left and right are provided on both sides of the base 11. Fixing sleeves 121 are provided on both sides of the middle part of the base plate 12. The two fixing sleeves 121 are sleeved and fixed on the left and right positioning shafts 111 of the base 11. The front end of the base plate 12 is rotatably connected to the front end of the seat 2, becoming the fulcrum for the seat 2 to tilt forward and backward. The rear end of the base plate 12 is rotatably connected to the bottom end of the backrest 3, becoming the fulcrum for the rotation of the backrest 3.

[0039] In this embodiment, a vertically extending gas spring 14 is connected to the bottom center or a suitable position of the base 11. The bottom end of the gas spring 14 is connected to the chassis (not shown in the figure), and the chassis is in contact with the ground via casters. The user can control the locking and unlocking of the gas spring 14 by operating a lever connected to the control valve of the gas spring 14. When unlocked, the user's body weight or lifting force can compress or release the gas spring 14, thereby smoothly adjusting the ground clearance of the entire base assembly 1 and all structures above it (seat 2, backrest 3, etc.). The use of the gas spring 14 for height adjustment is existing technology, and its structure will not be described in detail here.

[0040] 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: Base components; The seat, the front end of which is rotatably connected to the front end of the base assembly; The backrest, the bottom of which is rotatably connected to the rear end of the base assembly; A seat connecting rod, one end of which is rotatably connected to the rear bottom of the seat and the other end of which is movably connected to the base assembly, is adapted to allow the seat to rotate about the front end of the base assembly; The backrest elastic rod has elastic retraction properties. One end is rotatably connected to the lower part of the backrest, and the other end is movably connected to the base assembly. It is suitable for being gradually stretched with a reduced amplitude when the backrest is tilted back and rotated. The linkage, which connects the seat connecting rod and the backrest elastic rod to the base assembly, is adapted to cause the seat to tilt downward synchronously from front to back when the backrest rotates backward from its initial position.

2. The linked office chair according to claim 1, characterized in that, The base assembly is provided with a limiting part to prevent the movement of the seat connecting rod and / or the backrest elastic rod, which is triggered during the backrest tilting and rotation, and is adapted to be gradually stretched by the backrest elastic rod at a normal amplitude after triggering.

3. The linked office chair according to claim 2, characterized in that, The base assembly has two lugs arranged at left and right intervals. Each lug has an arc-shaped groove. The seat connecting rod and the backrest elastic rod are located between the two lugs, and both have inserts on both sides that pass through the corresponding grooves and can slide along the grooves.

4. The linked office chair according to claim 3, characterized in that, When the backrest is in its initial state, the insert corresponding to the seat connecting rod abuts against the front end of the slide groove, and the rear end of the slide groove forms the limiting part, which is used to abut against the insert corresponding to the backrest elastic rod during the backrest tilting and rotating process.

5. The linked office chair according to claim 3, characterized in that, It also includes a locking mechanism for locking the backrest in its initial state so that it cannot recline, or for unlocking it to allow it to recline.

6. The linked office chair according to claim 3, characterized in that, The linkage includes two connecting rods located on the outer sides of the two lugs, with the two ends of the connecting rods rotatably sleeved on the two insert rods corresponding to the seat connecting rod and the backrest elastic rod located on the same side.

7. The linked office chair according to any one of claims 1-6, characterized in that, The backrest elastic rod includes a cylindrical member rotatably connected to the backrest, a rod movably connected to the base assembly, and an elastic member. The rod slides into the cylindrical member from the end of the cylindrical member away from the backrest, and the end of the rod that enters the cylindrical member has a support structure. The two ends of the elastic member support the support structure and the end of the cylindrical member away from the backrest, respectively, and are arranged around the rod.

8. The linked office chair according to any one of claims 1-6, characterized in that, The base assembly includes a base and a base plate. The base has left and right extending positioning shafts on both sides. The base plate has fixing sleeves on both sides of the middle part that are sleeved and fixed on the two positioning shafts. The front end of the base plate is rotatably connected to the front end of the chair seat, and the rear end of the base plate is rotatably connected to the bottom end of the backrest.

9. The linked office chair according to claim 8, characterized in that, The bottom of the base is connected to a vertically extending gas spring, and the bottom end of the gas spring is connected to a chassis.

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