Ergonomic office chair capable of automatically adjusting backrest

Abstract

The invention is applicable to the field of office chairs, and provides an ergonomic office chair capable of automatically adjusting a backrest, which comprises a chair seat additionally provided with five-star feet and armrests, and a backrest additionally provided with a headrest, the backrest is assembled on the chair seat; the backrest comprises a plurality of unit backrests, and the unit backrests are arranged independently and assembled on the framework of the backrest at the same time; the unit backrest comprises an adjusting frame and a backup plate, and the backup plate is used for being in direct contact with the back of a human body and providing support for the human body; the adjusting frame is assembled on the backup plate; the adjusting frame is used for forwards and outwards extending to adjust the angle of the backup plate and / or overturning to adjust the angle of the backup plate; the back-leaning cushion can adapt to the conditions that the sitting posture of leaning forward, the back of the body arches or the user bends over a table in front of the table, the gap between the waist and the back and the backrest is eliminated, and the situation that the upper back and the lumbar vertebra area are lack of effective support is avoided. Muscle tension and spine burden which are easily caused by keeping the posture for a long time are reduced.

Description

Technical Field

[0001] This invention relates to the field of office chairs, and more particularly to an ergonomic office chair with an automatically adjustable backrest. Background Technology

[0002] Ergonomic office chairs are office seats designed based on ergonomic principles. They aim to adapt to the user's body shape, posture, and dynamic activities through scientific structure and adjustment functions, thereby reducing fatigue and health damage caused by prolonged sitting. These chairs are usually equipped with adjustable seat height, seat depth, armrests, and lumbar support to support the natural curve of the spine, distribute body pressure, and provide appropriate freedom of movement. As people pay more attention to office health, ergonomic office chairs have become an important infrastructure in modern office environments. Their core design lies in achieving dynamic fit and support for the human body through active or passive adjustment.

[0003] Currently, some ergonomic office chairs on the market are equipped with automatic backrest adjustment functions. These typically rely on built-in sensors, pneumatic devices, or mechanical linkages to adaptively adjust the backrest angle based on the user's leaning motion or preset programs. These systems often sense changes in the user's back pressure or center of gravity and drive the backrest to tilt backward, providing continuous and supportive comfort when the user leans back. Some high-end models also incorporate posture recognition technology to automatically adjust the lumbar support position or backrest curvature to optimize support for the lumbar region. These automatic adjustment mechanisms aim to reduce the hassle of manual operation and improve the chair's responsiveness and comfort.

[0004] While existing automatic backrest adjustment technology has improved the adaptability of chairs to some extent, its functionality still has significant limitations. Currently, most systems focus on tilting backward and lack effective forward adjustment capabilities. When users adopt a forward-leaning posture, hunch their backs, or work at a desk, a gap often appears between the lower back and the backrest, resulting in a lack of effective support for the upper back and lumbar spine. Maintaining such postures for extended periods can easily lead to muscle tension and spinal strain. The poor forward tilt adjustment of the backrest cannot fully cover the dynamic support needs under different sitting postures, limiting the adaptability of ergonomic chairs in real-world usage scenarios. Summary of the Invention

[0005] (a) Technical problems to be solved The purpose of this invention is to provide an ergonomic office chair with an automatically adjustable backrest, which aims to solve the problem that the backrest of ergonomic office chairs can only be adjusted backward, and the forward adjustment is limited. In particular, some people hunch over or sit forward, and the backrest above the waist lacks support, resulting in poor forward tilt adjustment of the backrest.

[0006] (II) Technical Solution Specifically: an ergonomic office chair with an automatically adjustable backrest, comprising a seat with a five-star base and armrests, and a backrest with a headrest; the backrest is mounted on the seat; the backrest comprises several unit backrests, which are independently arranged and simultaneously mounted on the backrest frame; each unit backrest includes: A backrest is used to make direct contact with the human back and provide support for the human body; An adjustment bracket is mounted on the backrest; the adjustment bracket is used to extend forward and outward to adjust the backrest and / or to flip and adjust the angle of the backrest. When a person sits on the chair, the backrest uses one or more partial backrest units. Each unit uses an adjustment bracket to extend forward and outward to adjust the backrest panel and / or to rotate and adjust the angle of the backrest panel, so as to adapt to the forward leaning posture and fit against the back of the person sitting, providing effective support. This is to accommodate the person sitting in a forward leaning posture, with their back hunched, or when working at a desk, eliminating the gap between the lower back and the backrest, avoiding the lack of effective support for the upper back and lumbar spine area, and reducing the muscle tension and spinal burden that can easily be caused by maintaining such a posture for a long time.

[0007] The technical solution of this application will be further described below: In one embodiment, the adjustment bracket includes: An extension frame is added to the backrest frame; Two parallel rotating frames are mounted on one side of the extension frame and on the other side of the backrest. The rotating frames are used to adjust the rotating angle of the backrest, and the extension frames are used to adjust the degree of extension of the rotating frames and the backrest relative to the backrest frame.

[0008] Furthermore, the flipping frame includes: The support plate is horizontally mounted and fixed on the extended frame; The flip plate is distributed parallel to the support plate; A rotating component is disposed between the support plate and the flip plate, and is located at the ends of the support plate and the flip plate; the rotating component is used for the rotating assembly of the support plate and the flip plate.

[0009] Furthermore, the flipping frame also includes an electric telescopic rod A, one end of which is mounted on a support plate, and the other end is rotatably equipped with a guide block; the guide block is slidably mounted on a guide groove provided in the flipping plate, and the guide groove is distributed along the main body of the flipping plate.

[0010] Furthermore, the rotating member includes: The connecting plate is fixed to the support plate; A U-shaped positioning plate is fixed on a flip plate; the U-shaped positioning plate is rotatably assembled with a connecting plate via a positioning shaft.

[0011] Furthermore, the cantilever frame includes: A rectangular support frame is used for assembling two parallel flipping frames; Two extension structures are respectively distributed at both ends of the support frame and directly fixed to the support frame; the two extension structures extend and retract synchronously to adjust the extension degree of the flip frame and the backrest relative to the backrest frame.

[0012] Furthermore, the extended structure includes: Electric telescopic rod B is used to adjust the degree of extension of the flip frame and backrest relative to the backrest frame; An L-shaped plate is added to one end of the electric telescopic rod B; the L-shaped plate is fixed to the support frame. A fixing plate is added to the other end of the electric telescopic rod B; the fixing plate is fixed to the frame of the backrest.

[0013] In one embodiment, the backrest includes: Backrest support; The mounting cavity is formed on the back of the backrest support; the mounting cavity is used for mounting the adjustment bracket. An elastic inner pad is laid on the side of the backplate support away from the mounting cavity.

[0014] Furthermore, the elastic inner pad includes: An elastic pad is laid on the backrest support; the elastic pad is made of rubber. Several elastic support ropes are laid between the elastic pad and the backrest support; the elastic support ropes are installed inside the grooves opened on the backrest support.

[0015] Furthermore, the elastic support rope body comprises a plurality of unit elastic ropes, which are connected sequentially, one after the other; each unit elastic rope comprises: Connecting rope; A fixing rod is attached to the end of the connecting rope; the fixing rod has a cavity inside, and a spring is installed inside the cavity. One end of the spring is connected to the end of the connecting rope, and the other end is installed at the bottom of the cavity; a limiting plate is provided at the connection between the connecting rope and the spring; a limiting flange is provided at the opening of the cavity in conjunction with the limiting plate. The limiting flange and the limiting plate work together to prevent the spring from being stretched too much.

[0016] The adjustable frame of this invention provides dynamic and adaptive support for the user's back, especially in a forward-leaning sitting posture. Its core consists of two main parts: a dynamic adaptive forward-leaning support system and an active elastic micro-adjustment system. The two work together to achieve superior results.

[0017] The dynamic adaptive forward-leaning support system achieves proactive adaptation to macroscopic posture through a sophisticated mechanical structure. Specifically, when a passenger adopts a forward-leaning or hunched-over sitting posture, one or more backrest units are activated. The internal adjustment frame begins to work, firstly through the synchronous drive of the dual electric telescopic rods B on the extension frame, causing the entire adjustment frame, along with the backrest it supports, to extend forward relative to the main backrest frame, filling the gap in the lower back caused by the forward lean. Immediately afterwards, the electric telescopic rod A on the flip frame is activated, pushing the linkage mechanism composed of the support plate and the flip plate, causing the backrest to flip at an angle. This combined movement of extension and flipping allows the backrest to actively meet the forward-leaning back, forming an effective support surface, fundamentally solving the limitation of traditional chair backs that can only recline backward and cannot adjust the forward tilt angle.

[0018] The active elastic micro-adjustment system is nested on top of the aforementioned rigid adjustment, responsible for precise deformation and pressure distribution at the micro level. An elastic inner pad is provided on the backrest, containing multiple elastic support ropes that form one or more elastic units composed of several individual elastic ropes. When the user's back (especially the protruding scapular area) rests against the backrest, which has already undergone forward extension and rotation adjustments, the elastic units can perform localized and differentiated compression and deformation according to the specific contours of the back bones and muscles. For example, the unit elastic ropes in the scapular area experience more pressure and contraction, while the surrounding soft tissue areas deform less, thus naturally forming a three-dimensional support surface that highly conforms to the curve of the back.

[0019] (III) Beneficial Effects This invention relates to an ergonomic office chair with an automatically adjustable backrest, which, compared to existing technologies, has the following advantages: 1. When a person sits on the chair, the backrest uses one or more partial backrest units. Each unit uses an adjustment bracket to extend forward and outward to adjust the backrest and / or flip to adjust the angle of the backrest, so as to adapt to the forward leaning posture and fit against the back of the person sitting, providing effective support. This is to adapt to the person sitting in a forward leaning posture, with a hunched back, or working at a desk, eliminating the gap between the back and waist and the backrest, avoiding the lack of effective support for the upper back and lumbar spine area, and reducing the muscle tension and spinal burden that can easily be caused by maintaining such a posture for a long time. 2. When a passenger leans against one or more units of the backrest, the elastic pad, in conjunction with the elastic support rope, provides elastic expansion and contraction of several or more units of elastic rope at one or more locations, so that the elastic inner pad can adapt to the specific structure of the back with local deformation, especially the protruding scapula of the back shoulder, thereby improving comfort. 3. The combination of the mechanical adjustment system of the adjustable frame and the elastic system of the elastic inner pad achieves full-link adaptiveness from macro-posture capture to micro-body fit; it not only solves the problem of whether or not there is forward support, but also solves the quality problem of forward support through the fine adjustment of the elastic body, achieving high-quality, full-contact support for forward-leaning and hunched postures that could not be achieved by a single mechanical structure or static elastic material in the past; the same chair can dynamically adapt to users with different body types and habits (such as forward leaning angle, degree of scapular protrusion), and all can obtain a tailor-made fit; this ability to adapt to diversity surpasses the traditional ergonomic chairs that require manual intervention and adjustment, bringing a higher level of intelligent user experience; 4. When the mechanical structure of the adjustment frame adjusts the backrest to the forward-leaning position, without an elastic fine-tuning system, the pressure point on the back may be concentrated at the bony prominences. However, in this invention, one or more elastic units composed of several elastic ropes are formed, which can disperse and redistribute the pressure in real time, spreading the support force from the bony points to the surrounding soft tissues. This combination produces a dynamic pressure balance effect, so that even in an actively forward-leaning working posture, the user can feel uniform support, significantly reducing the number of times the user unconsciously adjusts their sitting posture frequently in search of comfort, and improving concentration. 5. The combined effect of the mechanical adjustment system of the adjustable frame and the elastic system of the elastic inner pad not only eliminates support gaps, but also gently guides the spine towards a more natural curve through continuous and active fit; especially in the forward-leaning position, the elastic containment and support of the scapular area indirectly relieves the tension in the cervical spine and upper back muscles; this systematic improvement in overall sitting posture pressure caused by precise local support is a comprehensive health benefit that was not anticipated at the beginning of the design. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of an ergonomic office chair with an automatically adjustable backrest according to one embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a unit backrest in one embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure after the middle unit backrest is split; Figure 4 This is a schematic diagram of the structure of the adjustment frame in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the flipping frame in one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the cantilever frame in one embodiment of the present invention; Figure 7 This is a schematic diagram of the extension structure in one embodiment of the present invention; Figure 8This is a schematic diagram of the backing plate in one embodiment of the present invention; Figure 9 for Figure 8 A schematic diagram of the structure after the center support plate is flipped over; Figure 10 This is a schematic diagram of the internal structure of the elastic inner pad in one embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of an elastic support rope in one embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of a unit elastic rope in one embodiment of the present invention.

[0021] In the attached diagram: 1. Five-star base; 2. Seat; 3. Armrest; 4. Backrest; 5. Unit backrest; 6. Headrest; 51. Adjustment frame; 52. Backrest; 511. Extension frame; 512. Flip frame; 513. Support frame; 514. Extension structure; 521. Backrest support body; 522. Elastic inner pad; 523. Mounting cavity; 524. Elastic support rope; 525. Unit elastic rope; 526. Fixing rod; 527. Connecting rope; 5121. Support plate; 5122. Electric telescopic rod A; 5123. Flip plate; 5124. Rotating component; 5141. L-shaped plate; 5142. Electric telescopic rod B; 5143. Fixing plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The specific implementation of the invention will be described in detail below with reference to specific embodiments.

[0023] In embodiments of the present invention, such as Figures 1-3 As shown: An ergonomic office chair with an automatically adjustable backrest includes a seat 2 with a five-star base 1 and armrests 3, and a backrest 4 with a headrest 6; the backrest 4 is mounted on the seat 2. The reason why "five-star base 1, seat 2, armrest 3 and headrest 6" are not described in detail is that they are all existing technologies and can be purchased directly on the market or assembled by purchasing parts, etc. Whether they are disclosed or not does not affect the backrest 4 that is to be protected, so they will not be elaborated on here. The backrest 4 comprises several unit backrests 5, which are independently arranged and simultaneously assembled on the frame of the backrest 4; each unit backrest 5 includes: Backrest 52 is used to make direct contact with the human back and provide support for the human body; An adjustment bracket 51 is mounted on the back plate 52; the adjustment bracket 51 is used to extend forward and outward to adjust the back plate 52 and / or to flip and adjust the angle of the back plate 52. Therefore, when a person sits on the seat 2, the backrest 4 uses one or more unit backrests 5. The unit backrest 5 uses the adjustment bracket 51 to extend forward and outward to adjust the backrest 52 and / or flip to adjust the angle of the backrest 52, so as to adapt to the forward leaning and fit against the back of the person sitting, providing effective support. This adapts to the person sitting in a forward leaning posture, with a hunched back, or working at a desk, eliminating the gap between the back and the backrest 4, avoiding the lack of effective support for the upper back and lumbar spine area, and reducing the muscle tension and spinal burden that can easily be caused by maintaining such a posture for a long time. This solves the problem that ergonomic office chairs can only adjust the backrest backward, with limited forward adjustment. In particular, some people hunch over or sit forward, and the backrest above the waist lacks support, resulting in poor forward tilt adjustment.

[0024] In embodiments of the present invention, such as Figures 2-4 As shown: The adjustment frame 51 includes: The extension frame 511 is added to the frame of the backrest 4; Two parallel rotating frames 512 are mounted on one side of the extension frame 511 and on the other side of the backrest 52. The rotating frames 512 are used to adjust the rotating angle of the backrest 52, and the extension frame 511 is used to adjust the degree of extension of the rotating frames 512 and the backrest 52 relative to the backrest 4 frame.

[0025] Furthermore, such as Figure 4 and Figure 5 As shown: The flipping frame 512 includes: Support plate 5121 is horizontally mounted and fixed on the cantilever frame 511; The flip plate 5123 is distributed parallel to the support plate 5121; A rotating component 5124 is disposed between the support plate 5121 and the flip plate 5123, and is located at the ends of the support plate 5121 and the flip plate 5123; the rotating component 5124 is used for rotating the support plate 5121 and the flip plate 5123.

[0026] like Figure 5 As shown: The flipping frame 512 also includes an electric telescopic rod A5122. One end of the electric telescopic rod A5122 is mounted on the support plate 5121, and the other end is rotatably equipped with a guide block. The guide block is slidably mounted on the guide groove opened in the flipping plate 5123, and the guide groove is distributed along the main body of the flipping plate 5123.

[0027] like Figure 5 As shown: The rotating component 5124 includes: The connecting plate is fixed on the support plate 5121; The U-shaped positioning plate is fixed on the flip plate 5123; the U-shaped positioning plate is rotatably assembled with the connecting plate through the positioning shaft.

[0028] Furthermore, such as Figure 4 and Figure 6 As shown: The cantilever frame 511 includes: A rectangular support frame 513 is used for assembling two parallel flip frames 512. Two extension structures 514 are respectively distributed at both ends of the support frame 513 and directly fixed to the support frame 513; the two extension structures 514 extend and retract synchronously to adjust the extension degree of the flip frame 512 and the backrest 52 relative to the backrest 4 frame.

[0029] like Figure 6 and Figure 7 As shown: The extended structure 514 includes: The electric telescopic rod B5142 is used to adjust the degree of extension of the flip frame 512 and the backrest 52 relative to the backrest 4 frame; An L-shaped plate 5141 is attached to one end of the electric telescopic rod B5142; the L-shaped plate 5141 is fixed to the support frame 513. A fixing plate 5143 is installed at the other end of the electric telescopic rod B5142; the fixing plate 5143 is fixed to the frame of the backrest 4.

[0030] As for "electric telescopic rod A5122 and electric telescopic rod B5142", they are not described in detail because they are both existing technologies and can be purchased directly on the market or assembled by purchasing parts, etc. Whether they are publicly available or not does not affect the backrest 4 that is to be protected, so they will not be elaborated on here. Therefore, when a person sits on the seat 2, the backrest 4 uses one or more unit backrests 5. The unit backrest 5 activates the adjustment frame 51, which in turn activates the extension frame 511 and the flip frame 512. The extension frame 511 simultaneously uses the electric telescopic rods B5142 on the two extension structures 514 to adjust the extension degree of the flip frame 512 and the backrest 52 relative to the backrest 4 frame. The flip frame 512 uses the electric telescopic rod A5122 to extend and retract, activating the support plate 5121 and the flip plate 5123 to rotate, thus flipping and adjusting the angle of the backrest 52. This completes the adjustment of the backrest 52 relative to the backrest 4 frame by extending it forward and / or flipping and adjusting the angle of the backrest 52, allowing for adaptive forward tilting, fitting snugly against the back of the person sitting, and providing effective support. This adapts to the person's forward-leaning posture, hunched back, or desk work, eliminating gaps between the lower back and the backrest 4, avoiding a lack of effective support for the upper back and lumbar region, and reducing the muscle tension and spinal burden that can easily occur from maintaining such a posture for a long time.

[0031] In embodiments of the present invention, such as Figure 8 and Figure 9 As shown: The backing plate 52 includes: 521 backrest support; The mounting cavity 523 is formed on the back of the back plate support 521; the mounting cavity 523 is used for mounting the adjustment frame 51 (the specific adjustment frame 51 is installed inside the mounting cavity 523 via the flip plate 5123). The elastic inner pad 522 is laid on the side of the back plate support 521 away from the mounting cavity 523.

[0032] Furthermore, such as Figure 8 and Figure 10 As shown: The elastic inner pad 522 includes: An elastic pad is laid on the backrest support 521; the elastic pad is made of rubber. Several elastic support ropes 524 are laid between the elastic pad and the backrest support 521; the elastic support ropes 524 are installed inside the grooves opened on the backrest support 521.

[0033] like Figure 11 and Figure 12 As shown: The elastic support rope 524 includes a plurality of unit elastic ropes 525, which are connected sequentially; each unit elastic rope 525 includes: Connecting rope 527; A fixing rod 526 is attached to the end of the connecting rope 527; the fixing rod 526 has a cavity inside, and a spring is installed inside the cavity. One end of the spring is connected to the end of the connecting rope 527, and the other end is installed at the bottom of the cavity; a limiting plate is provided at the connection between the connecting rope 527 and the spring; a limiting flange is provided at the opening of the cavity in conjunction with the limiting plate. The limiting flange and the limiting plate work together to prevent the spring from being stretched too much.

[0034] Therefore, when a passenger leans against one or more backrest units 5, the elastic pad, in conjunction with the elastic support rope 524, provides elastic extension and contraction of one or more elastic ropes 525 at one location, so that the elastic inner pad 522 can adapt to the specific structure of the back with local deformation, especially the protruding scapula of the back shoulder, thereby improving comfort.

[0035] In summary: The adjustment frame 51 of the present invention provides dynamic and adaptive support for the user's back, especially in a forward-leaning sitting posture; its core consists of two main parts: a dynamic adaptive forward-leaning support system and an active elastic micro-adjustment system, which work together to achieve superior results.

[0036] The dynamic adaptive forward-leaning support system achieves active adaptation to macroscopic posture through a sophisticated mechanical structure. Specifically, when the occupant adopts a forward-leaning or hunched-over sitting posture, one or more backrest units 5 are activated. The internal adjustment frame 51 begins to work, firstly through the synchronous drive of the dual electric telescopic rods B5142 on the extension frame 511, causing the entire adjustment frame 51, along with the backrest plate 52 it supports, to extend forward relative to the main backrest frame, filling the gap in the lower back caused by the forward lean. Immediately afterwards, the electric telescopic rod A5122 on the flip frame 512 is activated, pushing the linkage mechanism composed of the support plate 5121 and the flip plate 5123, causing the backrest plate 52 to flip at an angle. This combined movement of extension and flipping allows the backrest plate 52 to actively meet the forward-leaning back, forming an effective support surface, fundamentally solving the limitation of traditional chair backs that can only recline backward and cannot adjust the forward tilt angle.

[0037] The active elastic micro-adjustment system is nested on top of the rigid adjustment and is responsible for precise deformation and pressure distribution at the micro level. An elastic inner pad 522 is provided on the backrest 52, which is composed of multiple elastic support ropes 524 to form one or more elastic units composed of several unit elastic ropes 525. When the user's back (especially the protruding scapular area) is pressed against the backrest 52, which has been adjusted to extend and rotate forward, the elastic unit can perform localized and differentiated compression and deformation according to the specific contours of the back bones and muscles. For example, the unit elastic ropes 525 in the area corresponding to the scapula are compressed more and contract more significantly, while the surrounding soft tissue area deforms less, thus naturally forming a three-dimensional support surface that highly matches the curve of the back.

[0038] The combination of the mechanical adjustment system of the adjustment frame 51 and the elastic system of the elastic inner pad 522 realizes the full-link adaptive function from macro posture capture to micro body fit; it not only solves the problem of whether there is forward support, but also solves the quality problem of forward support through the fine adjustment of the elastic body, and achieves high-quality, full-contact support for forward-leaning and arched posture that could not be accomplished by a single mechanical structure or static elastic material in the past. The same chair can adapt to users with different body types and habits (such as forward tilt angle and degree of scapular protrusion), providing a tailor-made fit; this ability to adapt to diversity surpasses the traditional ergonomic chairs that require manual intervention and adjustment, bringing a higher level of intelligent user experience.

[0039] When the mechanical structure of the adjustment frame 51 adjusts the backrest 52 to the forward-leaning position, without an elastic fine-tuning system, the pressure point on the back may be concentrated at the bony prominence. However, in this invention, one or more elastic units composed of several elastic ropes 525 are formed, which can disperse and redistribute the pressure in real time, spreading the support force from the bony points to the surrounding soft tissues. This combination produces a dynamic pressure balance effect, so that even in an actively forward-leaning working posture, the user can feel uniform support, significantly reducing the number of times the user unconsciously adjusts their sitting posture frequently in search of comfort, and improving concentration.

[0040] The combined effect of the mechanical adjustment system of the adjustment frame 51 and the elastic system of the elastic inner pad 522 not only eliminates support gaps, but also gently guides the spine towards a more natural curve through continuous and active fit; especially in the forward-leaning state, the elastic containment and support of the scapular area indirectly relieves the tension in the cervical spine and upper back muscles; this systematic improvement in overall sitting posture pressure caused by precise local support is a comprehensive health benefit that was not anticipated at the beginning of the design.

[0041] In the description of this invention, unless otherwise stated, "a number" means two or more. Although embodiments of the invention have been shown and described in the description of this invention, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ergonomic office chair with an automatically adjustable backrest, comprising a seat with a five-star base and armrests, and a backrest with a headrest; the backrest is mounted on the seat; characterized in that, The backrest comprises several unit backrests, which are independently configured and simultaneously assembled onto the backrest frame; each unit backrest includes: A backrest is used to make direct contact with the human back and provide support for the human body; An adjustment bracket is mounted on the backrest; the adjustment bracket is used to extend forward and outward to adjust the backrest and / or to flip and adjust the angle of the backrest.

2. The ergonomic office chair with automatically adjustable backrest according to claim 1, characterized in that, The adjustment frame includes: An extension frame is added to the backrest frame; Two parallel rotating frames are mounted on one side of the extension frame and on the other side of the backrest. The rotating frames are used to adjust the rotating angle of the backrest, and the extension frames are used to adjust the degree of extension of the rotating frames and the backrest relative to the backrest frame.

3. The ergonomic office chair with automatically adjustable backrest according to claim 2, characterized in that, The tilting frame includes: The support plate is horizontally mounted and fixed on the extended frame; The flip plate is distributed parallel to the support plate; A rotating component is disposed between the support plate and the flip plate, and is located at the ends of the support plate and the flip plate; the rotating component is used for the rotating assembly of the support plate and the flip plate.

4. The ergonomic office chair with automatically adjustable backrest according to claim 3, characterized in that, The flipping frame also includes an electric telescopic rod A, one end of which is mounted on a support plate, and the other end is rotatably equipped with a guide block; the guide block is slidably mounted on a guide groove provided in the flipping plate, and the guide groove is distributed along the main body of the flipping plate.

5. The ergonomic office chair with automatically adjustable backrest according to claim 4, characterized in that, The rotating component includes: The connecting plate is fixed to the support plate; A U-shaped positioning plate is fixed on a flip plate; the U-shaped positioning plate is rotatably assembled with a connecting plate via a positioning shaft.

6. The ergonomic office chair with automatically adjustable backrest according to claim 2, characterized in that, The cantilever frame includes: A rectangular support frame is used for assembling two parallel flipping frames; Two extension structures are distributed at both ends of the support frame and are directly fixed to the support frame; the two extension structures extend and retract synchronously to adjust the extension degree of the flip frame and the backrest relative to the backrest frame.

7. The ergonomic office chair with automatically adjustable backrest according to claim 6, characterized in that, The extension structure includes: Electric telescopic rod B is used to adjust the degree of extension of the flip frame and backrest relative to the backrest frame; An L-shaped plate is added to one end of the electric telescopic rod B; the L-shaped plate is fixed to the support frame. A fixing plate is added to the other end of the electric telescopic rod B; the fixing plate is fixed to the frame of the backrest.

8. The ergonomic office chair with automatically adjustable backrest according to claim 1, characterized in that, The backrest includes: Backrest support; The mounting cavity is formed on the back of the backrest support; the mounting cavity is used for mounting the adjustment bracket. An elastic inner pad is laid on the side of the backplate support away from the mounting cavity.

9. The ergonomic office chair with automatically adjustable backrest according to claim 8, characterized in that, The elastic inner pad includes: An elastic pad is laid on the backrest support; the elastic pad is made of rubber. Several elastic support ropes are laid between the elastic pad and the backrest support; the elastic support ropes are installed inside the grooves opened on the backrest support.

10. The ergonomic office chair with automatically adjustable backrest according to claim 9, characterized in that, The elastic support rope body comprises a plurality of unit elastic ropes, which are connected sequentially, one after the other; each unit elastic rope includes: Connecting rope; A fixing rod is attached to the end of the connecting rope; the fixing rod has a cavity inside, and a spring is installed inside the cavity. One end of the spring is connected to the end of the connecting rope, and the other end is installed at the bottom of the cavity; a limiting plate is provided at the connection between the connecting rope and the spring; a limiting flange is provided at the opening of the cavity in conjunction with the limiting plate. The limiting flange and the limiting plate work together to prevent the spring from being stretched too much.

Images