Ergonomic seat

Abstract

The invention provides an ergonomic seat which comprises a base, a chair back and a seat body connected to the base in a front-back sliding mode, and the chair back comprises a back support capable of rotating front and back relative to the base and a backrest connected to the back support in a longitudinal sliding mode; the linkage rod is arranged between the chair seat and the back support, and the seat-back linkage pull wire is arranged between the backrest sliding up and down and the chair seat sliding front and back, so that when the chair back leans backwards, the chair seat can be linked to move forwards so as to adapt to the change of the gravity center position of a seated person and the chair; meanwhile, the forward-moving chair seat can be linked with the backrest to move downwards, so that when the chair back leans backwards, the backrest can be tightly attached to the back, and the self-adaptive supporting performance and comfort of the chair for a seated person are improved.

Description

Technical Field

[0001] This invention relates to the field of seating, and particularly to an ergonomic seating. Background Technology

[0002] Most office chairs or ergonomic chairs have a backrest that can rotate back and forth, while the seat remains fixed. The backrest can rotate backward to tilt or forward to return to an upright position to support the sitter's back. However, these existing office chairs or ergonomic chairs have shortcomings in terms of support and stability. First, because the rotation center of the human back is higher than that of the chair back, the rotation trajectory of the back and the chair back are not the same, and the backrest still moves relative to the back, creating a "rubbing back" feeling in the lower back when the chair back is tilted back. Second, as the sitter's back tilts back further, the center of gravity of the entire chair will shift excessively backward, and the chair is prone to tipping over.

[0003] Some chairs have a backrest that can rotate back and forth relative to the seat, and a backrest mounted on the backrest. The backrest and the backrest are connected by a sleeve-type adjustment mechanism to adjust the backrest to move back and forth to a predetermined support position. When the chair back is tilted back, the backrest adjusted to the predetermined position will move relative to the back. However, this type of chair back still requires manual adjustment by the user, and it is difficult to guarantee that the backrest will automatically conform to the back when tilted back.

[0004] In addition, some chairs have seats that can slide back and forth, which can change the position of the sitter's buttocks. When sitting, adjusting the seat to a forward position can also help prevent the chair from tipping over. However, similar to the backrest, the back-sliding adjustment of the seat still requires manual operation by the sitter. When the backrest is reclined, the seat cannot automatically move forward to match the change in the body's center of gravity, affecting comfort and stability. Based on the above problems, an ergonomic chair needs to be designed to improve the adaptive support and comfort of the user's upper body. Summary of the Invention

[0005] This invention provides an ergonomic chair. By setting a linkage rod between the seat and the backrest support, and setting a seat-back linkage cable between the vertically sliding backrest and the front-back sliding seat, the seat can be moved forward when the backrest is tilted back to adapt to the change in the center of gravity of the sitter and the chair. At the same time, the forward-moving seat can also move the backrest downward, so that the backrest can fit snugly against the back when the backrest is tilted back, thus improving the adaptive support and comfort of the chair for the sitter.

[0006] The technical solution of this invention is implemented as follows:

[0007] An ergonomic chair includes a base, a backrest, and a seat that is slidably connected to the base. The backrest includes a back support that can rotate back and forth relative to the base and a backrest that is slidably connected to the back support in a longitudinal direction. A linkage component is connected between the backrest and the seat. The linkage component includes a seat-back linkage cable connecting the seat and the backrest, and a linkage rod extending in a front-back direction with its two ends connected to the seat and the back support, respectively. The front and rear ends of the linkage rod are connected to the seat and the back support, respectively. The arrangement path of the seat-back linkage cable is configured such that when the seat moves forward, it can pull the backrest to slide downward.

[0008] When the chair back is tilted back and the seat moves forward through the linkage rod, the forward-moving seat moves forward and the backrest slides down in sync through the linkage cable.

[0009] Preferably, the front and rear ends of the linkage are rotatably connected to the chair back and the back support, respectively. When the chair back is tilted back, the linkage swings and pushes the chair seat forward to slide.

[0010] Preferably, the back support is hinged to the rear end of the base and can rotate back and forth; the hinge position between the rear end of the linkage rod and the back support is below the hinge position between the back support and the base.

[0011] Preferably, the front end of the linkage rod is slidably connected to the seat or the rear end of the linkage rod is slidably connected to the back support through a pin groove structure; the pin groove structure includes a linkage pin set on the linkage rod and a linkage inclined groove set on the seat or back support extending forward and downward, with the linkage pin and the linkage inclined groove slidingly engaged; when the back of the chair is tilted back, the linkage rod swings and pushes the seat forward to slide.

[0012] Preferably, the connection point between the front end of the linkage rod and the seat extends forward beyond the middle of the seat; a linkage rod with a longer front-to-back length only needs to swing with a small amplitude to move the seat forward a longer distance, while reducing the possibility of interference between the linkage rod and other parts of the seat during its movement.

[0013] Preferably, the chair also includes an elastic element that, when the backrest is tilted back and the seat is moved forward, forces the backrest support to rotate forward to reset and simultaneously forces the seat to slide backward to reset.

[0014] Preferably, the elastic element is a gas spring, with its two ends connected to the back support and the base, respectively. The gas spring includes a cylinder and a piston rod that elastically extends and retracts within the cylinder, with the piston rod always having a tendency to elastically extend out of the cylinder.

[0015] Preferably, the gas spring is hinged to the backrest support and the base at both ends to prevent the chair from locking up when the backrest is tilted back.

[0016] Preferably, the linkage rod is located between the upper end of the base and the lower end of the seat; this is to avoid the linkage rod being exposed and affecting the appearance of the seat, and also to prevent safety issues such as pinching hands.

[0017] Preferably, a reset elastic element is provided between the backrest and the back support. The reset elastic element can generate an elastic force that causes the backrest to return to its original position after it slides down.

[0018] Preferably, the seat-back linkage cable includes a first guide sleeve and a seat-back cable body passing through the first guide sleeve. One end of the first guide sleeve is fixed to the base to form a first base connection end. The first guide sleeve extends backward from the first base connection end and then extends upward to be fixed to the back support to form the arrangement path. The two ends of the seat-back cable body are respectively connected to the seat and the backrest. When the backrest is tilted back and the seat moves forward in linkage with the backrest, the seat-back cable body pulls the backrest downward under the guidance of the first guide sleeve.

[0019] Preferably, the chair also includes armrests located on the left and right sides of the base. Each armrest includes an armrest frame and an armrest board that slides back and forth on the top of the armrest frame. Each armrest board is connected to the seat by an armrest linkage cable. The arrangement path of the armrest linkage cable is configured such that when the seat moves forward, the armrest board is pulled backward by the armrest linkage cable; when the human body leans back, the armrest board can provide adaptive support for the arms.

[0020] Preferably, the armrest linkage cable includes a second guide sleeve and an armrest cable body passing through the second guide sleeve. One end of the second guide sleeve is fixed to the base and forms a second base connection end. The second guide sleeve extends backward from the second base connection end and then extends forward and is fixed to the armrest frame to form the arrangement path. The two ends of the armrest cable body are connected to the seat and the armrest board respectively. When the back of the chair is tilted back and the seat moves forward in linkage, the armrest cable body pulls the armrest board to slide backward under the guidance of the second guide sleeve.

[0021] Preferably, the two armrests are symmetrically connected to both sides of the base; or, the two armrests are symmetrically connected to both sides of the back support.

[0022] Preferably, an elastic reset component is provided between the armrest frame and the armrest board. The elastic reset component can generate a spring force that causes the armrest board to slide forward and reset when it moves backward. When the chair back tilts forward and resets, the armrest board can also gradually reset itself, providing adaptive support for the forward-moving arm.

[0023] Preferably, the top of the handrail frame has a handrail seat, and the handrail plate is slidably connected to the handrail seat; the handrail plate has a receiving cavity, and a strip-shaped relief groove extending forward and backward is provided through the bottom of the receiving cavity; the handrail seat has a first protrusion that passes through the strip-shaped relief groove and is inserted into the receiving cavity; the inner wall of the receiving cavity has a second protrusion, which is located in front of the first protrusion; the elastic reset member is a compression spring disposed in the receiving cavity and located between the first and second protrusions; or, the second protrusion is located behind the first protrusion, and the elastic reset member is a tension spring disposed in the receiving cavity and located between the first and second protrusions.

[0024] The beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0025] 1. This invention, by setting a linkage rod between the backrest support and the seat, allows the linkage rod to push the seat forward when the backrest support and backrest are reclined, shifting the center of gravity of the seat forward and preventing the seat from tipping over due to the occupant's back leaning back. Simultaneously, a seat-back linkage cable arranged along a predetermined path is set between the seat and the backrest, allowing the forward-moving seat to simultaneously move the backrest downward, creating a dual linkage effect. This allows the backrest to adapt to the movement trajectory of the back and provide support for the reclining back. Therefore, the seat of this invention improves the adaptive support and comfort of the seat, enhances the interaction between the occupant and the seat, and better meets the occupant's needs.

[0026] 2. If the length of the linkage rod is short and its front end is connected to the rear of the chair seat, the shorter linkage rod will rotate at a larger angle when the chair back is tilted back. This can easily cause interference with other parts of the seat, resulting in jamming, and it will also be difficult to push the chair seat forward a greater distance. Therefore, to ensure that the chair seat can move forward effectively to match the tilting motion of the chair back, in this invention, the connection point between the front end of the linkage rod and the chair seat extends forward beyond the middle of the chair seat. The linkage rod with a longer length can move the chair seat forward a greater distance at the same swing angle, while avoiding jamming or interference problems caused by excessive swing angle of the linkage rod.

[0027] 3. The present invention installs linkage cables arranged along a predetermined path on the seat and armrests, so that the seat and armrests are linked together; when the occupant leans back, the linkage rod pushes the seat forward, causing the linkage cables to pull the armrests backward, so as to follow and adaptively support the backward-moving arms, making the seat more ergonomic and improving the comfort and user experience of the seat.

[0028] 4. In this invention, a seat-back linkage cable is used to form a seat-back linkage between the seat and the backrest, and an armrest linkage cable is used to form a linkage between the seat and the armrest. While satisfying the linkage effect and improving the comfort of the seat, the cost of the cable structure used in this invention is lower and the installation is more convenient. Moreover, compared with rigid linkage components, the flexible cable structure occupies less space, can be flexibly deformed, is easier to arrange, and will not interfere with other components on the seat due to its rigid structure, ensuring that the seat can be used normally. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the seat's shape;

[0030] Figure 2 An enlarged view of the cable body connecting to the backrest via a snap-fit ​​structure;

[0031] Figure 3 This is a structural diagram of the chair seat;

[0032] Figure 4 An enlarged view of the structure in which the first and second guide tube sleeves are fixed on the base;

[0033] Figure 5 An enlarged view of the structure with guide columns installed on both sides of the backrest;

[0034] Figure 6 A schematic diagram showing the connection between the handrail cable body passing through the second guide tube and the handrail plate;

[0035] Figure 7 A simplified schematic diagram showing the second guide sleeve arranged along a predetermined path;

[0036] Figure 8 A schematic diagram showing the armrest cable passing through a hole in the back support and connecting to the seat in the forward direction;

[0037] Figure 9 A simplified schematic diagram illustrating the predetermined path formed by the handrail cable body and the second guide wheel after they are engaged.

[0038] Figure 10 This is a side view of the chair with the backrest in an upright position.

[0039] Figure 11 A simplified schematic diagram showing the connection between the chair seat and the front end of the linkage rod via a pin groove structure.

[0040] Figure 12 A side view showing that when the chair back is tilted back, the linkage pushes the seat forward, and the seat simultaneously moves the armrests backward.

[0041] Figure 13 This is a side view of the chair with the backrest in an upright position and the backrest in a relatively high position.

[0042] Figure 14 The side view shows the seat moving forward and the backrest moving downward when the chair back is tilted back;

[0043] Figure 15 A simplified schematic diagram showing the predetermined path formed after the seat back cable body and the first guide wheel are engaged;

[0044] Figure 16 This is a side view of Example 2, showing that when the chair back is tilted back, the seat back linkage cable pulls only the lumbar support to move downward.

[0045] The reference numerals in the attached drawings are as follows: 1-base, 11-base plate, 12-side plate, 13-slide groove, 14-first bracket, 2-seat, 21-side connecting plate, 22-guide pin, 3-armrest, 3a-second guide wheel, 31-armrest frame, 311-sliding guide groove, 312-fixed bracket, 321-sliding connection part, 322-strip clearance groove, 32-armrest plate, 33-receiving cavity, 34-second protrusion, 35-first protrusion, 36-elasticity 37-Armrest linkage cable, 38-Second guide tube sleeve, 4-Backrest bracket, 4a-Slot, 41-Backrest, 41a-Backrest support, 41b-Lumbar support, 42-Lower limit part, 43-Guide column, 44-Longitudinal guide groove, 45-Reset elastic element, 46-Upper limit part, 5-Seat-backrest linkage cable, 5a-First guide wheel, 51-First guide tube sleeve, 52-Second bracket, 53-Clip head, 6-Linkage rod, 7-Elastic element. Detailed Implementation

[0046] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention 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.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0048] The specific implementation of this invention is as follows:

[0049] like Figure 1-16As shown, this embodiment provides an ergonomic chair, including a base 1, a backrest, and a seat 2 slidably connected to the base 1. The backrest includes a back support 4 that can rotate back and forth relative to the base 1, and a backrest 41 slidably connected to the back support 4 in the longitudinal direction. In this embodiment, the backrest 41 can be a single-back structure or a double-back structure as shown in the figure. The double-back structure backrest 41 includes a back support member 41a positioned higher and a lumbar support member 41b positioned lower. The lumbar support member 41b is connected to the back support member 41a and can slide synchronously in the longitudinal direction on the back support 4. The base 1 includes a base plate 11 and a backrest 41 connected to the left and right sides of the base plate 11 and extending upward beyond the base plate 11. The side plate 12 at the end; each side plate 12 is provided with a sliding connection structure between itself and the seat 2. The number of sliding connection structures can be a single one or multiple spaced back and forth as shown in the figure in this embodiment; the sliding connection structure includes a guide pin 22 provided on one of the side plate 12 and the seat 2, and a sliding groove 13 provided on the other side plate 12 and the seat 2, the sliding groove 13 extending in the back and forth direction; the structure shown in this embodiment is that the guide pin 22 and the sliding groove 13 are respectively provided on the seat 2 and the side plate 12; wherein the left and right sides of the seat 2 are provided with side connecting plates 21, the side connecting plates 21 are provided with the guide pin 22, the guide pin 22 is engaged in the sliding groove 13 so that the seat 2 and the side plate 12 are connected by a guide pin 22. The base 1 is slidably connected in the front-to-back direction; a linkage component is connected between the backrest and the seat 2, the linkage component including a seat-back linkage cable 5 connecting the seat 2 and the backrest 41, and a linkage rod 6 extending in the front-to-back direction with its two ends respectively connected between the seat 2 and the backrest support 4, the front and rear ends of the linkage rod 6 being connected to the seat 2 and the backrest support 4 respectively; specifically, the front end of the linkage rod 6 is movably connected to the seat 2, and the rear end of the linkage rod 6 is fixedly connected to the backrest support 4; or the rear end of the linkage rod 6 is movably connected to the backrest support 4, and the front end of the linkage rod 6 is fixedly connected to the seat 2; or, the front end of the linkage rod 6 is movably connected to the seat 2, and the linkage rod is fixedly connected to the backrest support 4; or, the front end of the linkage rod 6 is movably connected to the seat 2, and the linkage rod is fixedly connected to the backrest support 4. The rear end and the backrest support 4 are both movable connections; the arrangement path of the seat-back linkage cable 5 is configured so that when the seat 2 moves forward, it can pull the backrest 41 to slide downward; this dual linkage design makes the seat more ergonomic. When the occupant leans back and the backrest rotates backward, the backrest support 4 can move the seat 2 forward through the linkage rod 6, so that the center of gravity of the seat will not be too far back. At the same time, the forward-moving seat 2 can also pull the backrest 41 downward through the seat-back linkage cable 5, so that when the occupant leans back, the backrest 41 can follow the movement trajectory of the occupant's back and form adaptive support for the back, thereby improving the interaction between the seat and the occupant and the comfort of the seat.

[0050] Furthermore, in this embodiment, both ends of the linkage rod 6 are preferably rotatably connected to the seat 2 and the back support 4, respectively. When the back of the chair is tilted back, the linkage rod 6 swings and pushes the seat 2 forward to slide. The back support 4 is hinged to the rear end of the base 1 and can rotate back and forth. The hinge position between the rear end of the linkage rod 6 and the back support 4 is below the hinge position between the back support 4 and the base 1. The hinge point between the back support 4 and the base 1 is the first hinge point, and the hinge point between the rear end of the linkage rod 6 and the back support 4 is the second hinge point. The portion between the second hinge point and the first hinge point forms a swing arm, such as... Figure 10 , Figure 13 As shown, when the back support 4 rotates backward, the lower end of the swing arm swings forward, causing the linkage rod 6 to swing and causing the seat 2 to move forward.

[0051] Furthermore, in addition to the rotatable connection, the front end of the linkage rod 6 is slidably connected to the seat 2 or the rear end of the linkage rod 6 is slidably connected to the back support 4 via a pin groove structure, so that when the back support 4 rotates backward, the seat 2 moves forward through the linkage rod 6; for example Figure 11 As shown in the figure, this embodiment only illustrates the structure in which the back support 4 is rotatably connected to the rear end of the linkage rod 6, and the seat 2 is slidably connected to the front end of the linkage rod 6. The pin groove structure includes a linkage pin 5a set on the linkage rod 6 and a linkage inclined groove 5b set on the seat 2 or the back support 4 extending forward and downward. The linkage pin 5a and the linkage inclined groove 5b are slidably engaged. When the back of the chair is tilted back, the linkage rod 6 swings and causes the linkage pin 5a to slide relative to the linkage inclined groove 5b, thereby generating a component force that pushes the seat 2 forward to slide, thus achieving the same linkage effect.

[0052] Furthermore, if the linkage rod 6 is exposed on the seat, it will not only affect the appearance of the seat, but also easily cause safety problems such as pinching hands. Therefore, in this embodiment, the base plate 11 and the two side plates 12 form a receiving space. The linkage rod 6 is located between the upper end of the base 1 and the lower end of the seat 2, and is located within the receiving space, thereby ensuring the simple appearance of the seat and improving the safety of the seat.

[0053] Furthermore, if the front-to-back length of the linkage rod 6 is relatively short, and the front end of the linkage rod 6 is hinged to the rear position of the seat 2, when the back of the chair is reclined, the shorter linkage rod 6 is prone to large-scale rotation. In addition to easily interfering with the base 1 and causing jamming, it is also difficult to push the seat 2 forward a large distance. Therefore, in this embodiment, the connection position between the front end of the linkage rod 6 and the seat 2 extends forward beyond the middle position of the seat 2. This allows the front end of the linkage rod 6 to move forward as far as possible and hinge to the front position of the seat. When the back of the chair is reclined, the longer linkage rod 6 only needs to swing a small angle to move the seat 2 forward a large distance. At the same time, the linkage rod 6 with a small swing angle will not interfere with the base 1 or other parts on the seat and will not cause jamming.

[0054] Furthermore, in this embodiment, the hinge position between the linkage rod 6 and the seat 2 can be staggered from the position of the sliding connection structure. However, to simplify the installation process of the linkage rod 6, in this embodiment, the hinge position between the front end of the linkage rod 6 and the seat 2 corresponds to one of the sliding connection structures. Specifically, in this embodiment, there are two sliding connection structures between each side plate 12 and the seat, spaced apart front and back. In the sliding connection structure at the front, the cross-sectional shape of the guide pin 22 is circular, and the guide pin 22 is configured as the pivot for the hinge between the linkage rod 6 and the seat 2. The front end of the linkage rod 6 is provided with a shaft hole. During installation, the guide pin 22 is simply inserted between the shaft hole and the slide groove 13. While completing the engagement between the guide pin 22 and the slide groove 13, the rotational connection between the front end of the linkage rod 6 and the seat 2 is also completed.

[0055] Furthermore, the seat also includes an elastic element 7. When the backrest is tilted back and the seat 2 moves forward, the elastic element 7 can force the backrest support 4 to rotate forward and reset, and simultaneously force the seat 2 to slide backward and reset. The elastic element 7 can be a torsion spring located at the rotatable connection between the base 1 and the backrest support 4, or a mechanical spring between the seat 2 and the base 1 that forces the seat 2 to move backward and reset; it can also be a mechanical spring or a gas spring between the backrest and the base 1; the mechanical spring is a tension spring or a compression spring; in this embodiment, only the structure of the elastic element 7 as a gas spring is shown. Both ends are connected to the back support 4 and the base 1 respectively. The corresponding ends of the gas spring are hinged to the base 1 or the back support 4 to prevent the chair back from locking when it is tilted back. The gas spring includes a cylinder and a piston rod that elastically extends and retracts inside the cylinder. The piston rod always tends to elastically extend out of the cylinder. When the back support 4 is tilted back, the piston rod is elastically retracted into the cylinder after being subjected to the force of the back support 4. When the back moves away from the backrest 41, the piston rod elastically extends and pushes the back support 4 to rotate forward and reset. When the back support 4 rotates forward, it pulls the chair seat 2 backward through the linkage rod 6 to reset.

[0056] Furthermore, to facilitate the locking or unlocking of the chair back and seat 2 in corresponding positions and meet the different seating needs of users, the gas spring described in this embodiment is preferably a self-locking gas spring with a built-in self-locking device. The self-locking device is usually connected to a pull cable, which is connected to a control switch. By pulling the pull cable through the control switch, the piston rod is controlled to lock or unlock at a predetermined position. This allows the user to switch between an upright sitting posture and a reclining sitting posture at any angle, making the functions of the seat-back linkage chair more diversified. This self-locking gas spring is an existing component, and its specific structure will not be described in detail.

[0057] Furthermore, such as Figure 5As shown, the back support 4 includes a base plate and side mounting plates connected to the left and right sides of the base plate and extending beyond the front surface of the base plate. Each side mounting plate is hinged to a corresponding side plate 12 on the base 1. A longitudinal sliding structure is provided between the side mounting plates and the backrest 41. The longitudinal sliding structure includes a guide groove 44 provided on the side mounting plate and a guide post 43 correspondingly provided on the backrest 41. The guide post 43 cooperates with the guide groove 44 to allow the backrest 41 to slide longitudinally on the back support 4. To facilitate the downward sliding backrest 41 to return to a higher initial position, a reset elastic element 45 is provided between the back support 4 and the backrest 41. The reset elastic element 45 can force the backrest 41 to always have an upward position. The tendency of sliding and resetting; the resetting elastic element 45 can be a tension spring or a compression spring disposed between the back support 4 and the backrest 41; in this embodiment, only the structure of the resetting elastic element 45 as a compression spring is shown; specifically, the back support 4 is provided with a lower limit part 42, and the backrest 41 is provided with an upper limit part 46 located above the lower limit part 42, and the resetting elastic element 45 is a compression spring disposed between the lower limit part 42 and the upper limit part 46; or, the positions of the upper and lower limit parts can be interchanged, and a tension spring can be installed between the upper and lower limit parts; in this embodiment, the upper and lower limit parts are each provided with a locking post, and the two ends of the compression spring cooperate with the locking post respectively to prevent the compression spring from bending when it is elastically deformed.

[0058] Furthermore, the seat-back linkage cable 5 includes a first guide sleeve 51 and a seat-back cable body passing through the first guide sleeve 51. Specifically, a first bracket 14 and a second bracket 52 are respectively fixed on the base 1 and the back support 4. In this embodiment, only a single guide sleeve 51 is shown. For the purpose of enhancing the linkage effect, the number of guide sleeves 51 connecting the first bracket 14 and the second bracket 52 in this embodiment can also be multiple, and the number of seat-back cable bodies corresponds to the number of first guide sleeves 51. The seat-back cable body is usually made of multiple thin steel wires wound together, and the first guide sleeve 51 is usually made of elastic rubber or plastic. Both the seat and backrest pull cable are flexible components that can be bent elastically. The linked pull cable 5 formed by the two is easy to install on the seat without worrying about interference with the components on the seat. One end of the first guide sleeve 51 is fixed to the first bracket 14 and forms the first base connection end. The first guide sleeve 51 extends backward from the first base connection end and then extends upward to be fixed to the second bracket 52 on the backrest bracket 4 to form the arrangement path. From the outside, the entire arrangement path of the first guide sleeve 51 is roughly L-shaped. The two ends of the seat and backrest pull cable body pass through the two ends of the first guide sleeve 51 and are respectively connected to the seat 2 and the backrest 41. Figure 13-14 As shown, when the chair back tilts back and the seat 2 moves forward, the backrest cable body pulls the backrest 41 downward under the guidance of the first guide sleeve 51.

[0059] Furthermore, such as Figure 15As shown, the seat-back linkage cable 5 in this embodiment may also include only the seat-back cable body. In this case, a guide structure can be set to make the seat-back linkage cable 5 form the aforementioned layout path. The guide structure can be any of the guide wheel or guide column. For example, a first guide wheel 5a can be rotatably set on the base 1 so that one end of the seat-back cable body is connected to the seat 2 to form a seat connection end. Then, the seat-back cable body extends backward from the seat connection end and passes around the first guide wheel 5a before extending upward and connecting with the backrest 41 to form an L-shaped layout path. Thus, the first guide wheel 5a guides the seat-back cable body to turn, so that the seat 2 achieves the same linkage effect with the backrest 41 through the seat-back cable body.

[0060] Furthermore, the seat also includes armrests 3 located on the left and right sides of the base 1. Each armrest 3 includes an armrest frame 31 and an armrest plate 32 that slides back and forth on the top of the armrest frame 31. In this embodiment, the back support 4 can be hinged to the base 1 or between the two armrest frames 31. Each armrest plate 32 is connected to the seat 2 by an armrest linkage cable 37. The arrangement path of the armrest linkage cable 37 is configured such that when the seat 2 moves forward, the armrest plate 32 is pulled backward by the armrest linkage cable 37. When the human body leans back, the armrest plate 32 can provide adaptive support for the arms. Specifically, the armrest linkage cable 37 includes a second guide tube sleeve 38 and an armrest cable body passing through the second guide tube sleeve 38. One end of the second guide tube sleeve 38 is fixed to the first bracket 14 on the base 1 to form a second base connection end. The second guide tube sleeve 38 extends backward from the second base connection end and then extends forward to be fixedly connected to a fixed bracket 312 on the armrest frame 31 to form the arrangement path (in this embodiment). Figure 6 and Figure 8 Only a portion of the second guide sleeve 38, which is connected to the handrail frame 31 and the base 1, is shown in the illustration. Figure 7 As shown, the layout path of the entire second guide tube sleeve 38 is roughly U-shaped. The two ends of the armrest pull cable body, which is inserted inside the second guide tube sleeve 38, are connected to the seat 2 and the armrest board 32, respectively. When the back of the chair is tilted back and the seat 2 moves forward in conjunction with it, the armrest pull cable body pulls the armrest board 32 to slide backward under the guidance of the second guide tube sleeve 38.

[0061] Furthermore, such as Figure 9As shown, the armrest linkage cable 37 in this embodiment may also include the armrest cable body but not the second conduit sleeve 38. In this case, a guide structure can be set to make the armrest linkage cable 37 form the aforementioned layout path. The guide structure can be any of the guide rollers or guide columns. For example, a second guide wheel 3a can be rotatably set on the base 1 or armrest bracket 31 so that one end of the armrest cable body is connected to the seat 2 to form a seat connection end. Then, the armrest cable body extends backward from the seat connection end and passes around the second guide wheel 3a before extending forward and connecting with the armrest plate 3 to form a U-shaped layout path. Thus, the second guide wheel 3a provides a steering and guiding effect to the armrest cable body, and can also achieve the same linkage effect to the armrest plate 3.

[0062] Furthermore, such as Figure 2 As shown, in this embodiment, to facilitate cable installation, both ends of the seat-back linkage cable body are provided with snap-fit ​​structures between the backrest 4 and the seat 2. The snap-fit ​​structures include snap heads 53 at the corresponding ends of the seat-back linkage cable body and slots 4a on the backrest 41 and the seat 2. Specifically, the snap heads 53 are fixedly connected to the two ends of the seat-back linkage cable body. During installation, simply engaging the snap heads 53 with the corresponding slots 4a completes the connection process between the seat-back linkage cable body and the seat 2 and backrest 41. Similarly, as... Figure 6 As shown, the armrest cable body is also provided with the aforementioned clips 53 at both ends, and the corresponding armrest plate 32 and seat 2 are also provided with the aforementioned slots 4a. During installation, simply engage the clips 53 with the corresponding slots 4a to complete the connection process between the armrest cable body and the seat 2 and armrest plate 32.

[0063] Furthermore, the top of the handrail frame 31 has a handrail base, and the handrail plate 32 is slidably connected to the handrail base; as... Figure 6 As shown, the armrest seat is provided with a sliding guide groove 311 extending forward and backward. The armrest plate 3 has a sliding connection part 321 that slides in the sliding guide groove 311. The cross-section of the sliding connection part 321 itself is approximately T-shaped, while the cross-section formed by the sliding connection part 321 and the armrest plate 3 is approximately I-shaped. In order to allow the armrest plate 3 to adaptively support the forward-moving arm during the reset process of the backrest and seat 2, such as... Figure 1As shown, an elastic reset member 36 is provided between the armrest seat and the armrest board 32. The elastic reset member 36 can generate a spring force to push the armrest board 32 forward and reset when it moves backward. At the same time, the presence of the elastic reset member 36 can also make the armrest board 32 move backward stably and evenly, without rapidly sliding to the rearmost position under the traction of the armrest linkage cable 37. The elastic reset member 36 can be a tension spring or a compression spring. In this embodiment, only the elastic reset member 36 shown is a compression spring structure. Specifically, the armrest board 3 and the armrest bracket 31 are respectively connected to a front protrusion 34 and a rear protrusion 35. The elastic reset member 36 is a compression spring disposed between the front protrusion 34 and the rear protrusion 35, so that when the chair back tilts forward and resets, the armrest board 32 can also gradually reset itself.

[0064] Furthermore, when the chair back rotates backward and the seat 2 moves forward, the armrest linkage cable 37 pulls the armrest plate 3 to gradually move backward, providing follow-up support for the arm that has moved backward; at the same time, the armrest plate 3 causes the elastic reset member 36 to elastically deform; when the seat 2 and the chair back gradually return to their original positions, the armrest linkage cable 37 gradually relaxes, at which point the elastic reset member 36 releases its elastic force, causing the armrest plate 3 to gradually move forward, providing follow-up support for the arm that has moved forward.

[0065] Furthermore, if the compression spring were exposed outside the armrest plate 32, it could easily interfere with the arm and affect the appearance of the seat. Therefore, in this embodiment, the armrest plate 32 has a receiving cavity 33. Figure 1 As shown, the upper end of the receiving cavity 33 is open, and a cover (not shown) is connected to the opening. The bottom of the receiving cavity 33 is provided with a strip-shaped relief groove 322 extending from front to back. The armrest seat has a first protrusion 35 that passes through the strip-shaped relief groove 322 and is inserted into the receiving cavity 33. The inner wall of the receiving cavity 33 has a second protrusion 34, which is located in front of the first protrusion 35. The elastic reset member 36 is a compression spring disposed in the receiving cavity 33 and located between the first protrusion 35 and the second protrusion 34; or, the second protrusion 34 is located behind the first protrusion 35, and the elastic reset member 36 is a tension spring (not shown) disposed in the receiving cavity 33 and located between the first protrusion 35 and the second protrusion 34. The elastic reset member 36 provides a reset elastic force for the armrest 32 while also being hidden in the receiving cavity of the armrest 32, making the appearance of the seat simple and avoiding interference or contact between the elastic reset member 36 and the seated person's hand.

[0066] Furthermore, to prevent the armrest linkage cable 37 from being completely exposed on the seat, the armrest bracket 31 in this embodiment is a hollow tubular component. The armrest bracket 31 is a generally L-shaped hollow tube, including a transverse portion connected to the side plate 12 of the base 1 and a front extension portion connected to the armrest plate 3. The inner cavity of the tubular armrest bracket 31 is equivalent to an L-shaped cable channel, with both ends of the cable channel communicating outwards. To facilitate the installation of the armrest linkage cable 37, it can be installed as described in this embodiment. Figure 4 As shown, a wire-passing hole corresponding to the opening of the wire-passing channel is formed on the side plate 12 of the base 1. Alternatively, as in this embodiment, a wire-passing hole can be formed on the side plate 12 of the base 1. Figure 8 As shown, a through hole is made in the back support 4. After one end of the armrest cable body and one end of the second guide tube sleeve 38 are connected to the seat 2 and the base 1 respectively, the armrest linkage cable 37 formed by the two can enter the cable channel through the through hole and pass out from the other opening of the cable channel. The other end of the armrest cable body and the other end of the second guide tube sleeve 38 are connected to the armrest board 32 and the armrest frame 31 respectively. At the same time, most of the structure of the armrest linkage cable 37 is hidden in the armrest support 31 to prevent the armrest linkage cable 37 from being completely exposed and affecting the appearance of the seat.

[0067] Furthermore, in this embodiment, the two armrest frames 31 can be symmetrically connected to both sides of the base 1, so that when the chair back is tilted back, the armrest board 32 moves backward; or the two armrest frames 31 can also be symmetrically connected to both sides of the back support 4; when the chair back is tilted back, both the armrest frame 31 and the armrest board 32 will move backward, thereby increasing the range of backward movement of the armrest board 32 when the chair back is tilted back.

[0068] Example 2: This example differs from the previous example in that the lumbar support 41b and the back support 41a are not linked; that is, the lumbar support 41b and the back support 41a are separate from each other; as shown... Figure 16 As shown, a linkage cable 5 connects the lumbar support 41b to the seat 2. The linkage cable 5 is arranged such that when the seat 2 moves forward, the linkage cable 5 exerts a downward force on the lumbar support 41b. The structure of the linkage cable 5 is the same as in the above embodiment. When the occupant leans back on the seat 2, the backrest 4 rotates backward and moves the seat 2 forward. The linkage cable 5 pulls the lumbar support 41b downward, while the backrest 41a remains in a higher position. This allows the lumbar support 41b to follow the seat 2 forward and provide support to the lower back. This design is suitable for occupants who only need to support their lower back and not their back, meeting different user needs.

[0069] 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 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), a backrest, and a seat (2) that is slidably connected to the base (1). The backrest includes a back support (4) that can rotate back and forth relative to the base (1) and a backrest (41) that is slidably connected to the back support (4) in the longitudinal direction. A linkage component is connected between the backrest and the seat (2). The linkage component includes a seat-back linkage cable (5) that is connected between the seat (2) and the backrest (41) and a linkage rod (6) that extends in the front and rear direction and whose two ends are respectively connected between the seat (2) and the back support (4). The front and rear ends of the linkage rod (6) are respectively connected to the seat (2) and the back support (4). The arrangement path of the seat-back linkage cable (5) is configured so that when the seat (2) moves forward, it can pull the backrest (41) to slide downward. When the chair back tilts back and the seat (2) moves forward through the linkage rod (6), the forward-moving seat (2) moves downward in sync with the backrest (41) through the linkage pull line.

2. The ergonomic chair according to claim 1, characterized in that: The front and rear ends of the linkage rod (6) are rotatably connected to the backrest and the back support (4) respectively. When the backrest is tilted back, the linkage rod (6) swings and pushes the seat (2) forward to slide.

3. The ergonomic chair according to claim 2, characterized in that: The back support (4) is hinged to the rear end of the base (1) and can rotate back and forth; the hinge position of the rear end of the linkage rod (6) and the back support (4) is below the hinge position between the back support (4) and the base (1).

4. The ergonomic chair according to claim 1, characterized in that: The front end of the linkage rod (6) is slidably connected to the seat (2) or the rear end of the linkage rod (6) is slidably connected to the back support (4) through a pin groove structure. The pin groove structure includes a linkage pin (5a) set on the linkage rod (6) and a linkage inclined groove (5b) set on the seat (2) or the back support (4) extending forward and downward. The linkage pin (5a) and the linkage inclined groove (5b) are slidably engaged. When the back of the chair is tilted back, the linkage rod (6) swings and pushes the seat (2) forward to slide.

5. The ergonomic chair according to claim 1, characterized in that: The connection point between the front end of the linkage rod (6) and the seat (2) extends forward beyond the middle of the seat (2).

6. The ergonomic chair according to claim 1, characterized in that: It also includes an elastic element (7). When the back of the chair is tilted back and the seat (2) moves forward, the elastic element (7) can force the back support (4) to rotate forward to reset, and at the same time force the seat (2) to slide backward to reset.

7. The ergonomic chair according to claim 6, characterized in that: The elastic element (7) is a gas spring, and the two ends of the gas spring are connected to the back support (4) and the base (1) respectively. The gas spring includes a cylinder and a piston rod that elastically extends and retracts inside the cylinder. The piston rod always tends to elastically extend out of the cylinder.

8. The ergonomic chair according to claim 7, characterized in that: The two ends of the gas spring are hinged to the back support (4) and the base (1) respectively.

9. The ergonomic chair according to claim 1, characterized in that: The linkage rod (6) is located between the upper end of the base (1) and the lower end of the seat (2).

10. The ergonomic chair according to claim 1, characterized in that: A reset elastic element (45) is provided between the backrest (41) and the back support (4). The reset elastic element (45) can generate an elastic force that causes the backrest (41) to return to its original position after the backrest (41) slides down.

11. The ergonomic chair according to claim 1, characterized in that: The seat-back linkage cable (5) includes a first guide tube sleeve (51) and a seat-back cable body passing through the first guide tube sleeve (51). One end of the first guide tube sleeve (51) is fixed to the base (1) and forms a first base connection end. The first guide tube sleeve (51) extends backward from the first base connection end and then extends upward and is fixed to the back support (4) to form the arrangement path. The two ends of the seat-back cable body are connected to the seat (2) and the backrest (41) respectively. When the backrest tilts back and the seat (2) moves forward, the seat-back cable body pulls the backrest (41) downward under the guidance of the first guide tube sleeve (51).

12. The ergonomic chair according to claim 1, characterized in that: It also includes armrests (3) located on the left and right sides of the base (1). Each armrest (3) includes an armrest frame (31) and an armrest board (32) that slides back and forth on the top of the armrest frame (31). Each armrest board (32) is connected to the seat (2) by an armrest linkage cable (37). The arrangement path of the armrest linkage cable (37) is configured such that when the seat (2) moves forward, the armrest board (32) is pulled backward by the armrest linkage cable (37).

13. The ergonomic chair according to claim 12, characterized in that: The armrest linkage cable (37) includes a second guide tube sleeve (38) and an armrest cable body passing through the second guide tube sleeve (38). One end of the second guide tube sleeve (38) is fixed to the base (1) and forms a second base connection end. The second guide tube sleeve (38) extends backward from the second base connection end and then extends forward and is fixed to the armrest frame (31) to form the arrangement path. The two ends of the armrest cable body are connected to the seat (2) and the armrest board (32) respectively. When the back of the chair is tilted back and the seat (2) moves forward, the armrest cable body pulls the armrest board (32) to slide backward under the guidance of the second guide tube sleeve (38).

14. The ergonomic chair according to claim 12, characterized in that: Two handrails (31) are symmetrically connected to the two sides of the base (1); or, two handrails (31) are symmetrically connected to the two sides of the back support (4).

15. The ergonomic chair according to claim 11, characterized in that: An elastic reset member (36) is provided between the handrail frame (31) and the handrail board (32). The elastic reset member (36) can generate an elastic force that causes the handrail board (32) to slide forward and reset when the handrail board (32) moves backward.

16. The ergonomic chair according to claim 15, characterized in that: The top of the handrail frame (31) has a handrail seat, and the handrail plate (32) is slidably connected to the handrail seat. The handrail plate (32) has a receiving cavity (33), and the bottom of the receiving cavity (33) is provided with a strip-shaped relief groove (322) extending forward and backward. The handrail seat has a first protrusion (35) that passes through the strip-shaped relief groove (322) and is inserted into the receiving cavity (33). The inner wall of the receiving cavity (33) has a second protrusion (34), and the second protrusion (34) is located in front of the first protrusion (35). The elastic reset member (36) is a compression spring disposed in the receiving cavity (33) and located between the first protrusion (35) and the second protrusion (34); or, the second protrusion (34) is located behind the first protrusion (35), and the elastic reset member (36) is a tension spring disposed in the receiving cavity (33) and located between the first protrusion (35) and the second protrusion (34).

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