Ergonomic chair

Abstract

The utility model discloses an ergonomic seat, including base and chair back, the left and right sides of base are equipped with the handrail, and the chair seat that is in the top of base is equipped between two handrails, and the left and right sides of chair seat and chair back are equipped with the translational linkage mechanism, and the translational linkage mechanism includes the linkage piece of setting in the left and right sides of chair back, the connecting rod subassembly of setting between every handrail and chair seat, and the connecting rod subassembly includes front connecting rod and rear connecting rod, and the upper and lower ends of front connecting rod are hinged with handrail and chair seat respectively, and the upper and lower ends of rear connecting rod are hinged with handrail and chair seat respectively, handrail, chair seat, connecting rod subassembly constitute parallelogram connecting rod mechanism in common, every linkage piece is hinged with corresponding handrail, and linkage link and front connecting rod or rear connecting rod establish linkage relation through guide slot guide pin structure, make when chair back rotate back, can linkage chair seat only translate in front -back direction, reduced the structural complexity of seat and the extrusion feeling of chair seat to the position of thigh, make seat more accord with ergonomics.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to an ergonomic seating. Background Technology

[0002] Most office chairs or ergonomic chairs are equipped with a backrest that can rotate forward and backward and tilt, allowing the backrest to switch between an upright and reclined position to provide support for the back of the user who is working upright or resting in a reclining position. However, when the backrest is supported and rotated backward, the center of rotation of the user's back is higher than that of the backrest, causing a "rubbing" sensation on the back. At the same time, a large backward tilt of the backrest can also cause the center of gravity of the chair to shift backward, making the chair prone to tipping over. Therefore, chairs with a backrest and seat that can be linked have appeared on the market, aiming to improve the stability of the chair and reduce the "rubbing" sensation on the backrest.

[0003] For example, in the chair patent with publication number CN209915450, the chair frame includes a seat frame and a backrest frame. A tray is provided under the seat frame. Backrest fixing plates are provided on both sides of the seat frame and the backrest frame, respectively. The backrest fixing plates are hinged to the corresponding seat fixing plates. A push crossbar is also fixed between the two backrest fixing plates. The tray is equipped with two sets of left and right linkage mechanisms that move synchronously. The linkage mechanism is composed of multiple connecting rods set between the seat frame and the tray. When the chair back is tilted back, the push crossbar fixed on the backrest moves forward and triggers the linkage mechanism, lifting the seat forward and upward. However, this design has shortcomings.

[0004] The entire linkage mechanism has many connecting rod components, and the manufacturing and assembly costs are relatively high.

[0005] As the chair moves forward, it also moves upward, creating an upward lifting force on the sitter's thighs. This can compress the legs and cause discomfort. This is especially true for smaller sitters, as it can easily cause their feet to lift off the ground, affecting their normal sitting posture and is not ergonomic. Summary of the Invention

[0006] This utility model provides an ergonomic chair. By setting a translation linkage mechanism between the armrests, seat, and backrest, the seat can be moved only in the front-to-back direction when the backrest rotates backward. This reduces the structural complexity of the chair and the pressure on the thighs, making the chair more ergonomic.

[0007] The technical solution of this utility model is implemented as follows: An ergonomic chair includes a base and a backrest. Armrests are provided on the left and right sides of the base, and a seat is positioned above the base between the two armrests. A translation linkage mechanism is provided on the left and right sides of the seat and backrest. The translation linkage mechanism includes linkage members on the left and right sides of the backrest and a linkage assembly between each armrest and the seat. The linkage assembly includes a front linkage and a rear linkage. The upper and lower ends of the front linkage are hinged to the armrest and the seat, respectively, and the upper and lower ends of the rear linkage are also hinged to the armrest and the seat, respectively. The armrests, seat, and linkage assembly together form a parallelogram linkage mechanism. Each linkage member is hinged to its corresponding armrest. Either the front or rear linkage is configured as a linkage rod. One of the linkage members and the linkage rod has a guide pin, and the other linkage member and the linkage rod has a guide groove extending in a non-front-back direction. The guide pin is slidably connected within the guide groove. Under the action of external force, the chair back and linkage rotate back and forth, causing the parallelogram linkage mechanism to deform, so that the chair seat can translate back and forth.

[0008] Preferably, the guide groove extends vertically or obliquely along the longitudinal direction and is disposed on the rear connecting rod, and the guide pin is disposed on the linkage member; this eliminates the need for the linkage member to extend forward and interact with the front connecting rod, thus optimizing the cost and structural layout of the seat.

[0009] Preferably, the chair seat includes a seat support and connecting components disposed on the left and right sides of the seat support. The connecting components include two connecting plates spaced apart front to back, and the two connecting plates are respectively hinged to the lower end of the front link and the lower end of the rear link.

[0010] Preferably, the chair back also includes an elastic element, which is configured to provide a restoring force to the chair back by its own elastic deformation when the chair back rotates backward.

[0011] Preferably, the elastic element is a mechanical spring or gas spring with one end acting on the armrest and the other end acting on the front or rear linkage.

[0012] Preferably, the armrest has a shell-like structure, including an armrest board and an armrest cover. The upper ends of the front and rear connecting rods are both hinged to the armrest board, and the armrest cover is connected to the side of the armrest board and seals the connecting rod assembly between the armrest board and the armrest cover to avoid the connecting rod assembly being completely exposed and affecting the appearance of the seat.

[0013] Preferably, a control mechanism is also included, which can control the backrest and seat to switch between locked and active states; allowing the user to control the seat and backrest to move or lock according to their own needs, thus expanding the function and scope of use of the chair.

[0014] Preferably, the control mechanism includes multiple slots and control components spaced circumferentially on the front or rear connecting rod. The control components include a base on the handrail and a latching member and a driving member movably connected to the base. The latching member is movably connected to the base. A linkage structure is provided between the driving member and the latching member. A pull cable is connected to the driving member and connected to a control switch exposed on the handrail. The linkage structure is configured such that when an external force is applied to the control switch and the pull cable is tensioned, the driving member moves and drives the latching member to engage or disengage from the corresponding slot.

[0015] Preferably, the snap-fit ​​component is slidably connected to the base to be close to or away from the slot, and the drive component is slidably connected to the base with the sliding direction of the drive component perpendicular to the sliding direction of the snap-fit ​​component; the linkage structure is a drive ramp provided on one of the drive component and the snap-fit ​​component.

[0016] Preferably, an elastic reset element is provided between the snap-fit ​​component and the base. When the external force controls the switch to tighten the pull cable, the snap-fit ​​component moves and squeezes the elastic reset element to produce elastic deformation. When the external force is removed and the pull cable is relaxed, the elastic reset element resets and the snap-fit ​​component returns to its initial position.

[0017] The beneficial effects of this utility model, which adopts the above technical solution, are as follows: This invention hinges the two sides of the chair back to the corresponding armrests via a linkage, and makes the armrests, seat, and linkage assembly form a parallelogram linkage mechanism. When the chair back rotates backward, the parallelogram linkage mechanism can be deformed in conjunction with it. At this time, the front and rear linkages swing and the seat moves only in the front-back direction. This reduces the "back-rubbing" feeling of the chair back and prevents the center of gravity of the seat from shifting too far back. It also avoids the feeling of the seat squeezing the thighs, making the seat more ergonomic and meeting the user's needs.

[0018] The seat is also equipped with a control mechanism consisting of a multi-position locking structure and control components, which allows the backrest and seat to be locked or unlocked according to the user's own needs. For example, the user can lock the backrest in an upright position to provide normal back support, or lock the backrest in a tilted position to lean back and rest, further expanding the seat's functionality and scope.

[0019] The armrest consists of an armrest board and an armrest cover. The linkage assembly is located between the armrest board and the seat, while the armrest cover can cover the exposed linkage assembly and other components, making the overall shape of the seat look more concise and beautiful. Attached Figure Description

[0020] Figure 1 This is a diagram showing a seat with a cushion installed. Figure 2 Enlarged view of the location of the clearance; Figure 3This is an enlarged view of the location of the strip-shaped clearance groove; Figure 4 A schematic diagram showing the base of the control components fixed inside the armrest cover; Figure 5 A schematic diagram of the linkage assembly and linkage components, with the armrest cover removed; Figure 6 This is a side sectional view of the chair with the backrest upright. Figure 7 A simplified diagram illustrating the forward movement of the seat when the backrest rotates backward; Figure 8 Exploded view of the control mechanism; Figure 9 From another angle, the explosion of the control mechanism; Figure 10a A cross-sectional view of the control mechanism when the snap-fit ​​component is inserted into the slot; Figure 10b A cross-sectional view of the control mechanism when the snap-fit ​​component disengages from the slot; Figure 11 This is a cross-sectional view of the control mechanism in Example 2; The attached figures are labeled as follows: 1-base, 2-seat, 21-connecting plate, 3-armrest, 31-armrest plate, 32-armrest cover, 33-connecting ear, 34-mounting slot, 321-avoidance opening, 322-strip avoidance slot, 4-backrest, 5-linkage component, 6-front linkage, 7-rear linkage, 71-guide groove, 72-extension, 8-slot, 9-base, 91-clamping component, 911-clamping tooth, 92-elastic reset component, 93-drive component, 931-linkage structure, 94-pull cable, 95-control switch, 96-guide channel, 97-avoidance window, 98-slide groove, a-first upper hinge point, b-first lower hinge point, c-second upper hinge point, d-second lower hinge point. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0023] This utility model has several specific embodiments, and the specific implementation methods are as follows: Example 1: As Figure 1-10bAs shown, this embodiment provides an ergonomic chair, including a base 1 and a backrest 4. Armrests 3 are provided on the left and right sides of the base 1, each armrest 3 being fixedly connected to the base 1. The base 1 is a rigid plate-like structure used for insertion with a lifting gas spring. A seat 2 is provided between the two armrests 3, positioned above the base 1. A translation linkage mechanism is provided on the left and right sides of the seat 2 and the backrest 4. The translation linkage mechanism includes linkage members 5 on the left and right sides of the backrest 4 and a connecting rod assembly between each armrest 3 and the seat 2. The connecting rod assembly includes a front connecting rod 6 and a rear connecting rod 7. The upper and lower ends of the front connecting rod 6 are hinged to the armrest 3 and the seat 2 respectively, forming a first upper hinge point a and a first lower hinge point b spaced apart vertically. The upper and lower ends of the rear connecting rod 7 are hinged to the armrest 3 and the seat 2 respectively, forming a second upper hinge point c and a second lower hinge point d spaced apart vertically. The armrests 3, the seat 2, and the connecting rod assembly together constitute a parallelogram connecting rod. The mechanism, the parallelogram, refers to the fact that the distance between the first upper hinge point a and the first lower hinge point b is equal to the distance between the second upper hinge point c and the second lower hinge point d. At the same time, the distance between the first upper hinge point a and the second upper hinge point c, and the distance between the first upper hinge point b and the second lower hinge point d are also equal, so that the lines connecting the four hinge points form a parallelogram with opposite sides that are parallel and equal. It does not mean that the outer length of the seat 2 and the armrest 3 must be the same. Each linkage 5 is hinged to the corresponding armrest 3. Either the front link 6 or the rear link 7 is configured as a linkage rod. One of the linkage 5 and the linkage rod is provided with a guide pin 51, and the other of the linkage 5 and the linkage rod is provided with a guide groove 71 extending in a non-front-back direction. The guide pin 51 is slidably connected in the guide groove 71 so that the swing trajectory of the linkage 5 matches the swing trajectory of the linkage rod, so as to establish a smooth linkage mechanism between the seat 2 and the backrest 4. like Figure 6-7 As shown, under the action of external force, the backrest 4 and the linkage 5 rotate back and forth. At this time, the guide pin 51 slides in the guide groove 71 and causes the parallelogram linkage mechanism to deform. At this time, the armrest 3 remains stationary, while the front linkage 6 and the rear linkage 7 swing back and forth to drive the seat 2 to move back and forth, so that the backrest 4 provides adaptive support for the back, and the seat 2 will not exert upward pressure on the thighs, thus improving the comfort of the seat.

[0024] Furthermore, in the structure illustrated in this embodiment, the rear connecting rod 7 is preferably configured as a linkage rod, wherein the guide groove 71 extends vertically or obliquely along the longitudinal direction and is disposed on the rear connecting rod 7. The guide groove 71 can be a straight groove or an arc groove; the guide pin 51 is disposed on the linkage member 5; while linking the parallelogram linkage mechanism, the linkage member 5 does not need to extend forward and be provided with a structure of guide groove 71 and guide pin 51 between it and the front connecting rod 6, so that the linkage member 5 does not need to be designed to be too long, thereby optimizing the cost and structural layout of the seat while realizing the linkage between the seat 2 and the backrest 4.

[0025] Furthermore, to facilitate hinge connection with the front link 6 and the rear link 7, the chair seat 2 includes a seat support and connecting assemblies disposed on the left and right sides of the seat support. The connecting assemblies include two connecting plates 21 spaced apart front to back. Each connecting plate 21 includes a horizontal plate for fixing to the seat support and a vertical plate for connecting to the front link 6 or the rear link 7. The two connecting plates 21 spaced apart front to back are respectively hinged to the lower end of the front link 6 and the lower end of the rear link 7 to avoid directly threading a pivot on the seat support.

[0026] Furthermore, to allow the backrest 4 and seat 2 of the seat to return to their original positions, the seat also includes an elastic element 61, and at least one armrest 3 is provided with the elastic element 61. The elastic element 61 is configured to provide a restoring force to the backrest 4 through its own elastic deformation when the backrest 4 rotates backward. There are many ways to configure the elastic element 61; for example, in the structure shown in this embodiment, one end of the elastic element 61 acts on the armrest 3, and the other end acts on the front link 6 or the rear link 7. The elastic element 61 can be a mechanical spring or a gas spring; for example... Figure 4 As shown in the figure, the elastic element 61 in this embodiment is a tension spring disposed between the front link 6 and the armrest 3; or, the elastic element 61 may also be a compression spring disposed between the rear link 7 and the armrest 3 (not shown); or, the elastic element 61 may be a torsion spring disposed between the linkage 5 and the armrest 3 (not shown); all of the above elastic elements 61 generate elastic deformation when the backrest 4 rotates backward, and release the elastic force when the back of the seated person leaves the backrest 4, so that the backrest 4 and the seat 2 return to the initial position.

[0027] Furthermore, in this embodiment, the armrest 3 has a shell-like structure, including an armrest plate 31 and an armrest cover 32. The upper ends of the front connecting rod 6 and the rear connecting rod 7 are both hinged to the armrest plate 31. The armrest cover 32 is connected to the side of the armrest plate 31 and seals the connecting rod assembly between the armrest plate 31 and the armrest cover 32 to prevent the connecting rod assembly from being completely exposed and affecting the appearance of the seat. Specifically, the armrest cover 32 is located inside the armrest plate 31, and the rear end of the armrest cover 32 is provided with a connecting lug 33 for corresponding linkage. The component 5 is hinged to the connecting ear 33; at the same time, in order to facilitate the insertion of the linkage component 5 into the shell-shaped armrest 3 and its smooth rotation, a wide clearance opening 321 is also provided through the rear end of the armrest cover 32; in addition, the lower ends of the front link 6 and the rear link 7 are both hinged to the seat 2 by pins. Therefore, in order to facilitate the hinge of the link assembly and the seat 2, a strip-shaped clearance groove 322 is also provided through the inner side of the armrest cover 32. The strip-shaped clearance groove 322 is mainly to avoid the pin and prevent the pin from interfering with the armrest cover 32.

[0028] Furthermore, to broaden the functionality and scope of use of the seat, this embodiment also includes a control mechanism that can control the backrest 4 and seat 2 to switch between a locked state and an active state; allowing the occupant to control the seat 2 and backrest 4 to move or lock according to their needs; at least one armrest 3 is equipped with the aforementioned control mechanism, which includes control components and a multi-position engagement structure, such as... Figure 8-9 As shown, the multi-position locking structure includes multiple slots 8 spaced circumferentially on the front link 6 or the rear link 7, and a locking member 91 on the handrail 3 corresponding to the slots 8. In this embodiment, only the structure with the slots 8 on the rear link 7 is shown. To facilitate the installation of multiple slots 8 without affecting the structural strength of the rear link 7, an extension 72 is fixedly connected to the rear link 7, and some or all of the slots 8 are located on the extension 72. The control component includes a base 9 on the handrail 3 and a drive member 93 movably connected to the base 9. The locking member 91 is movably connected to the base 9. A linkage structure 931 is provided between the drive member 93 and the locking member. A linkage is provided on the drive member 93. The transmission component can be a mechanical linkage or a flexible cable 94. Considering cost and seat space layout, the transmission component is preferably a cable 94 in this embodiment. The cable 94 is connected to a control switch 95 exposed on the armrest 3. The outer side of the armrest plate 31 is provided with a recessed mounting groove 34. The control switch 95 is usually a rotary wrench set in the mounting groove 34 or a sliding switch slidably connected to the armrest plate 31. The linkage structure 931 is configured such that when an external force acts on the control switch 95 and the cable 94 is tensioned, the driving component 93 moves and drives the locking component 91 to engage or disengage from the corresponding slot 8. In this embodiment, the locking component 91 is explained in the initial state of being disengaged from the slot 8.

[0029] Specifically, the base 9 and the armrest cover 32 are fixedly connected by screws. The base 9 is provided with a groove 98 extending toward the slot 8. The engaging member 91 is slidably connected in the groove 98 to move closer to or away from the slot 8. The engaging member 91 is provided with a tooth 911. The base 8 is provided with a clearance window 97 corresponding to the position of the slot 8 to allow the tooth 911 to pass through and engage or disengage from the slot 8. The clearance window 97 ensures that the engaging member 91 is completely within the groove 98 and not exposed when not engaged with the slot 8. The base 9 is also provided with a groove 98 extending toward the slot 8. The guide channel 96 is connected to the groove 81 and extends perpendicularly to the extension direction of the slide groove 98. The driving member 93 is a slider that is slidably connected in the guide channel 96, so that the sliding direction of the driving member 93 is perpendicular to the sliding direction of the snap-fit ​​member 91. The linkage structure 931 is a driving inclined surface provided on one of the driving member 93 and the snap-fit ​​member 91. In the initial state, the snap-fit ​​member 3 is disengaged from the snap-fit ​​groove 8. When the external force acts to control the switch 95 and tighten the pull wire 94, the driving inclined surface squeezes the snap-fit ​​member 91 and the snap-fit ​​teeth 911 are engaged in the corresponding snap-fit ​​groove 8.

[0030] Furthermore, to ensure that when the pull cord 94 is released, the latching member 91 automatically disengages from the slot 8, thus unlocking the chair back 4 and seat 2, an elastic reset member 92 is provided between the latching member 91 and the base 9. The elastic reset member 92 can be a tension spring or a compression spring; in this embodiment, only the compression spring is shown as the elastic reset member 92 located between the base 9 and the latching member 91. At least one of the base 9 and the latching member 91 has a locking post or locking hole that mates with the end of the compression spring to prevent the compression spring from bending during deformation. Figure 10a As shown, when the external force acts on the control switch 95 to tension the pull cable 94, the snap-fit ​​component 91 moves and squeezes the elastic reset component 92, causing elastic deformation; as Figure 10b As shown, when the external force is removed and the pull wire 94 is loosened, the elastic reset member 92 resets and the snap-fit ​​member 91 returns to its initial position; the snap-fit ​​member 91 automatically disengages from the slot 8; the snap-fit ​​member 91 will also slide back to its initial position by the driving inclined surface pressing the driving member 93.

[0031] Example 2: Figure 11 As shown, the difference between this embodiment and the above embodiment is that this embodiment provides another linkage structure 931, wherein the snap-fit ​​member 91 is an L-shaped component, which is hinged to the base 9 via a rotating shaft and can rotate between the unlocked position and the locked position; an elastic component (not shown) is also provided between the driving member 93 and the base 9, which can be a tension spring or a compression spring, so that the driving member 93 can be reset; the elastic reset member 92 is a torsion spring sleeved on the rotating shaft and acting between the base 9 and the snap-fit ​​member 91; the linkage structure 931 is a protrusion provided on the driving member 93. In the unlocked position, the protrusion faces the locking member 91. When an external force acts on the control switch 95 and tensions the pull cable 94, the drive member 93 slides in the guide channel 96 and pushes the locking member 91 to rotate to the locked position through the protrusion. At this time, the torsion spring and the elastic component deform, and the locking member 91 is engaged in the corresponding slot 8, thus locking the backrest 4 and the seat 2. When the pull cable 94 is released, the elastic component and the torsion spring reset, causing the drive member 93 to reset in the opposite direction. At the same time, the locking member 91 also rotates in the opposite direction and disengages from the slot 8, thus achieving the same operational effect as in the above embodiment.

[0032] Example 3: The difference between this example and the above examples is that the elastic element 61 in this example is a self-locking gas spring (not shown) with a self-locking device. This self-locking gas spring is an existing device, and its specific structure will not be described in detail. The self-locking device can be connected to a switch via a flexible pull rope. The switch controls the extension and retraction of the self-locking gas spring piston rod, so that the backrest 4 and the seat 2 are locked or unlocked at a predetermined position. Based on this, this example does not require the control mechanism as in Example 1 to achieve the locking and unlocking effect of the backrest 4 and the seat 2.

[0033] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An ergonomic chair, characterized in that, The chair includes a base (1) and a backrest (4). Armrests (3) are provided on the left and right sides of the base (1). A seat (2) is provided between the two armrests (3) and above the base (1). A translation linkage mechanism is provided on the left and right sides of the seat (2) and the backrest (4). The translation linkage mechanism includes linkage components (5) provided on the left and right sides of the backrest (4) and a linkage assembly provided between each armrest (3) and the seat (2). The linkage assembly includes a front linkage (6) and a rear linkage (7). The upper and lower ends of the front linkage (6) are hinged to the armrest (3) and the seat (2) respectively. Then, the upper and lower ends of the rear link (7) are hinged to the armrest (3) and the seat (2) respectively; the armrest (3), the seat (2), and the link assembly together form a parallelogram linkage mechanism; each linkage (5) is hinged to the corresponding armrest (3); either the front link (6) or the rear link (7) is configured as a linkage rod, and a guide pin (51) is provided on one of the linkages (5) and the linkage rod, and a guide groove (71) extending in a non-front-back direction is provided on the other of the linkage (5) and the linkage rod; the guide pin (51) is slidably connected in the guide groove (71); Under the action of external force, the chair back (4) and the linkage (5) rotate back and forth and cause the parallelogram linkage mechanism to deform so that the chair seat (2) can be translated back and forth.

2. The ergonomic chair according to claim 1, characterized in that: The guide groove (71) extends vertically or obliquely along the longitudinal direction and is disposed on the rear connecting rod (7), and the guide pin (51) is disposed on the linkage (5).

3. The ergonomic chair according to claim 1, characterized in that: The chair seat (2) includes a seat support and connecting components arranged on the left and right sides of the seat support. The connecting components include two connecting plates (21) spaced apart front and back. The two connecting plates (21) spaced apart front and back are respectively hinged to the lower end of the front connecting rod (6) and the lower end of the rear connecting rod (7).

4. The ergonomic chair according to claim 1, characterized in that: It also includes an elastic element (61), which is configured to provide a restoring force to the backrest (4) by its own elastic deformation when the backrest (4) rotates backward.

5. The ergonomic chair according to claim 4, characterized in that: The elastic element (61) is a mechanical spring or gas spring that acts on the handrail (3) at one end and on the front link (6) or the rear link (7) at the other end.

6. The ergonomic chair according to claim 1, characterized in that: The handrail (3) has a shell-like structure. The handrail (3) includes a handrail plate (31) and a handrail cover (32). The upper ends of the front connecting rod (6) and the rear connecting rod (7) are both hinged to the handrail plate (31). The handrail cover (32) is connected to the side of the handrail plate (31) and seals the connecting rod assembly between the handrail plate (31) and the handrail cover (32).

7. The ergonomic chair according to claim 1, characterized in that: It also includes a control mechanism that can control the backrest (4) and seat (2) to switch between locked and active states.

8. The ergonomic chair according to claim 7, characterized in that: The control mechanism includes multiple slots (8) spaced circumferentially on the front link (6) or the rear link (7) and a control component. The control component includes a base (9) on the handrail (3), a snap-fit ​​part (91) movably connected to the base (9), and a drive part (93). The snap-fit ​​part (91) is movably connected to the base (9). A linkage structure (931) is provided between the drive part (93) and the snap-fit ​​part (91). A pull wire (94) is connected to the drive part (93). The pull wire (94) is connected to a control switch (95) exposed on the handrail (3). When the linkage structure (931) is configured to be activated by external force to control the switch (95) and to tension the pull wire (94), the drive part (93) moves and drives the snap-fit ​​part (91) to snap into or disengage from the corresponding slot (8).

9. The ergonomic chair according to claim 8, characterized in that: The snap-fit ​​component (91) is slidably connected to the base (9) to be close to or away from the slot (8), and the drive component (93) is slidably connected to the base (9) with the sliding direction of the drive component (93) being perpendicular to the sliding direction of the snap-fit ​​component (91); the linkage structure (931) is a drive ramp provided on one of the drive component (93) and the snap-fit ​​component (91).

10. The ergonomic chair according to claim 8, characterized in that: An elastic reset member (92) is provided between the snap-fit ​​member (91) and the base (9). When the external force acts on the control switch (95) to tighten the pull wire (94), the snap-fit ​​member (91) moves and squeezes the elastic reset member (92) to produce elastic deformation. When the external force is removed and the pull wire (94) is relaxed, the elastic reset member (92) resets and the snap-fit ​​member (91) returns to its initial position.

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