A seat

Abstract

The application discloses a kind of seat, including seat, and the guide seat with different rotation points is rotationally arranged on seat, and backrest is rotationally arranged between the two, and the motion seat is slidably arranged with guide seat, and the motion seat is rotationally arranged with backrest, and the waist support is rotationally arranged on the motion seat;When backrest is inclined by external force, linkage motion seat slides down relative to guide seat, and guide seat is adaptively rotated to avoid interference, and waist support moves down to approach seat, and can be adapted to rotate in response to external force;Backrest and waist support can be relatively independently rotated, respectively adapt to the feedback of external force on human back and waist, and the linkage design of waist support with back support reclining down can automatically fit the curve of human waist and back in different postures, fill the gap between waist and seat to prevent empty waist;The present scheme does not need additional switch adjustment, and realizes reasonable support by structure linkage and adaptive rotation, improves use comfort and protects waist health, and the motion mechanism is smooth without interference.

Description

Technical Field

[0001] This invention relates to the field of furniture, and more particularly to a chair. Background Technology

[0002] In the field of seating, the chair back is a key component for improving seating comfort. The chair back supports the human lower back and has both comfort and support requirements. In terms of comfort, the chair back is required to conform to the curve of the human lower back to form a comfortable support surface. In terms of support, the chair back is required to provide reasonable support for the lower back in different postures. However, existing chair backs have shortcomings in both aspects.

[0003] First, in conventional chair backs, the lumbar support is directly connected to the backrest. When the backrest rotates, the lumbar support rotates along with it. The lumbar support cannot lean back and move down to fill the gap between the waist and the seat, which easily leads to a "loose waist" phenomenon, causing the waist to lose effective support. Long-term use can easily cause lumbar fatigue and injury. At the same time, the support surface formed by the backrest and lumbar support has a fixed shape and cannot conform to the curve of the human back in different postures, making it difficult to improve comfort.

[0004] With the development of technology, lumbar and backrest linkage chairs have emerged. Lumbar and backrest linkage is the core function of adapting to the curve of the human lumbar and back, improving the comfort of sitting for long periods, and protecting the health of the lumbar spine. The physiological curve of the lumbar and back varies significantly in different postures such as sitting at work and lying down to rest. The position, tilt angle, and fit of the lumbar support are different for each person. Moreover, different users have different body types and different needs. However, in the existing lumbar and backrest linkage solutions, the trajectory of the lumbar support is mostly completely restricted. It can only move synchronously with the back support component. The overall position and posture during the process are relatively fixed, lacking freedom and thus lacking a certain degree of adaptability, which prevents different users from getting a better experience.

[0005] Therefore, the lumbar and back linkage must also have adaptive adjustment and independent movement capabilities to achieve effective support in all postures. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a seat comprising a seat portion, a guide seat and a backrest rotatably mounted on the seat portion with different rotation points, and a motion seat positioned between the two. The motion seat is rotatably mounted on the backrest and slidably mounted on the guide seat, and a lumbar support is rotatably mounted on the motion seat. When the backrest is tilted backward by an external force, the motion seat slides down relative to the guide seat, the guide seat adaptively rotates to avoid interference, and the lumbar support moves down towards the seat portion accordingly, and can adaptively rotate in response to external forces. The backrest and lumbar support can rotate relatively independently, respectively adapting to the external force feedback of the human back and waist. Combined with the linkage design of the lumbar support moving down with the backrest support, it can automatically conform to the curve of the human waist and back in different postures, filling the gap between the waist and the seat portion to prevent lumbar hunchback. This solution requires no additional switch adjustment, achieving reasonable support through structural linkage and adaptive rotation, improving user comfort and protecting waist health, with smooth and interference-free motion mechanism.

[0007] The technical solution of this invention is implemented as follows:

[0008] A chair includes a seat, a guide seat and a backrest that are rotatably disposed relative to the seat, with the rotation points of the guide seat and the backrest located at different positions on the seat; a motion seat is disposed between the guide seat and the backrest, rotatably disposed relative to the backrest and slidably disposed relative to the guide seat, the backrest being configured to slide relative to the guide seat in response to an external force rotating relative to the seat; the rotation of the guide seat relative to the seat is configured such that the guide seat can adaptively rotate when the motion seat slides; a lumbar support is disposed on the motion seat, rotatably disposed relative to the motion seat and configured to adaptively rotate on the motion seat in response to an external force; when the backrest tilts backward in response to an external force, it causes the motion seat to slide downward relative to the guide seat, the guide seat adaptively rotates relative to the seat, and the lumbar support moves from top to bottom closer to the seat, and the lumbar support also adaptively rotates in response to an external force to conform to the curve of the human lower back.

[0009] The curves of the human back differ between sitting and lying positions. This design adapts to changes in the curves of the human back in different postures. Specifically, the backrest and lumbar support can rotate relative to the sitting position, meaning their rotation responds to external forces exerted on the user's back. They can rotate relative to the sitting position as the user's posture changes. At the same time, the backrest and lumbar support can rotate relatively independently, with the backrest responding to external forces exerted on the user's back and the lumbar support responding to external forces exerted on the user's waist. When the curves of the human back change, the backrest and lumbar support can rotate independently to adapt to and conform to the curves of the human back, thus providing more reasonable and comfortable support.

[0010] Furthermore, the backrest and lumbar support are linked through a motion seat and a guide seat. The backrest drives the motion seat to slide relative to the guide seat. When the backrest tilts backward, the downward movement of the backrest causes the motion seat to slide downward relative to the guide seat, which in turn causes the lumbar support to move downward closer to the seat. This lowers the position of the lumbar support, placing it in the gap between the waist and the seat, preventing the waist from being unsupported. Combined with the lumbar support's adaptive rotation as described above, it can further generate a suitable tilt angle to fit and support the waist, providing comfortable and effective lumbar support, improving user comfort, and protecting the health of the waist.

[0011] This solution integrates the independent rotation of the lumbar support and the backrest, and the linkage between the lumbar support and the backrest tilting down as the backrest leans back. It eliminates the need for switches and adjustments, and can automatically conform to the curves of the human back in different postures, preventing lumbar support and providing reasonable and comfortable support.

[0012] In addition to guiding the sliding motion of the motion seat, the guide seat can also rotate adaptively during the sliding motion of the motion seat to prevent interference. Since the motion seat and the backrest are set to rotate relative to each other, the backrest will not only cause the motion seat to slide, but also cause the motion seat to rotate slightly when it rotates. At this time, the guide seat needs to adapt to the change in the angle of the motion seat and rotate adaptively to ensure the smooth operation of the motion mechanism of this solution, which is also one of the foundations for achieving the above-mentioned beneficial effects.

[0013] Preferably, the exercise seat is equipped with a lumbar motion module, and the lumbar support is rotatably mounted on the lumbar motion module; a reset elastic element is provided between the lumbar motion module and the lumbar support, which acts on the lumbar support and provides elastic force for the lumbar support to rotate forward. This enables the lumbar support to self-adapt to rotation and conform to the human waist under different lumbar curves.

[0014] Preferably, the lumbar support module is slidably mounted on the exercise seat along its length. This allows the lumbar support to have independent height adjustment capabilities, thus adapting to the needs of different individuals.

[0015] Preferably, a locking structure is provided between the motion seat and the guide seat. This locking structure includes a locking element and several locking slots. The locking element is located on one of the motion seat or the guide seat, and the locking slots are distributed along the sliding direction of the motion seat on the other of the motion seat or the guide seat. When the locking element disengages from the locking slot, the motion seat can slide on the guide seat, allowing the backrest connector to rotate relative to the seat. When the locking element engages with the locking slot, the movement of the motion seat and the backrest is locked, keeping them in their current position. By locking and unlocking the motion seat and the guide seat, the backrest tilt is adjusted, allowing the user to hold the backrest at different tilt angles as needed, thus providing multiple backrest tilt positions between sitting and reclining positions.

[0016] Preferably, the stop component is mounted on the motion seat, and several stop grooves are arranged on the guide seat along the length of the guide seat.

[0017] Preferably, the motion seat is provided with a control component, which is rotatably arranged relative to the motion seat; the control component includes a cam, which is configured to drive the stop component to move toward the stop groove.

[0018] Preferably, the motion seat is also provided with a limiting spring, and the control component has a limiting protrusion on the side next to the cam that corresponds to the limiting spring. When the control component rotates, the limiting protrusion passes over the limiting spring. This increases the rotation range of the control component, allowing it to remain in a locked or unlocked state.

[0019] Preferably, the control also includes a knob located at its end for user convenience.

[0020] Preferably, the seat is also equipped with an armrest, and the backrest is rotatably connected to the armrest.

[0021] Preferably, there are two armrests located on the left and right sides of the seat. Each armrest has a rearward-extending mounting base, on which the backrest is rotatably mounted. The mounting base is configured to move the rotation point of the backrest to the hip position. This closer proximity of the backrest's rotation point to the body's upper and lower body when the user leans back allows for better body-hugging rotation, preventing back rubbing and lower back strain. Simultaneously, the lumbar support is located between the rotation points on both sides of the backrest support, ensuring effective sacral support and increasing comfort.

[0022] Preferably, the backrest is rotatably connected to the upper end of the motion seat; the backrest is provided with a downwardly extending rotating seat, which is rotatably connected to the motion seat; there is a gap between the rotating seat and the upper end of the motion seat to prevent the upper end of the motion seat from rotating.

[0023] Preferably, the system also includes an extension seat fixedly disposed relative to the seat, the extension seat extending rearward and its rear end rotatably connected to the front end of the guide seat. In addition to guiding the sliding motion of the seat, the guide seat can also rotate adaptively during the sliding motion of the seat to prevent interference. Since the seat and backrest are rotatably disposed relative to each other, the backrest, when rotating, will not only cause the seat to slide but also cause it to rotate slightly. In this case, the guide seat needs to adapt to the change in the seat's angle by rotating accordingly.

[0024] Preferably, a chassis is also provided below the seat, the chassis including a support plate fixedly connected to the seat, and the extension seat being directly fixedly connected to the rear end of the seat or fixedly connected to the support plate on the chassis. The extension seat can be fixed to the seat or fixed to the chassis.

[0025] Preferably, an elastic element for tilting and resetting the backrest is provided between the motion seat and the guide seat. The sliding direction of the motion seat is the length direction of the guide seat, and the guide seat will rotate adaptively with the movement of the motion seat, maintaining the sliding direction of the motion seat in the length direction of the guide seat. At the same time, it can also ensure that the elastic element always acts reasonably between the two, stably providing tilting and resetting elastic force.

[0026] Preferably, the motion seat is a sleeve, which is fitted and slidably mounted on the guide seat. An elastic element is disposed between the motion seat and the guide seat, with its two ends acting on the motion seat and the guide seat respectively. The elastic element is a compression spring to provide the elastic force for the backrest to return to an upright position.

[0027] Preferably, the guide seat is L-shaped and includes an integral main body and a connecting part. The connecting part extends laterally and is rotatably connected to the seat, while the main body extends vertically and the motion seat is fitted onto the main body.

[0028] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0029] The curves of the human back differ between sitting and lying positions. This design adapts to changes in the curves of the human back in different postures. Specifically, the backrest and lumbar support can rotate relative to the sitting position, meaning their rotation responds to external forces exerted on the user's back. They can rotate relative to the sitting position as the user's posture changes. At the same time, the backrest and lumbar support can rotate relatively independently, with the backrest responding to external forces exerted on the user's back and the lumbar support responding to external forces exerted on the user's waist. When the curves of the human back change, the backrest and lumbar support can rotate independently to adapt to and conform to the curves of the human back, thus providing more reasonable and comfortable support.

[0030] Furthermore, the backrest and lumbar support are linked through a motion seat and a guide seat. The backrest drives the motion seat to slide relative to the guide seat. When the backrest tilts backward, the downward movement of the backrest causes the motion seat to slide downward relative to the guide seat, which in turn causes the lumbar support to move downward closer to the seat. This lowers the position of the lumbar support, placing it in the gap between the waist and the seat, preventing the waist from being unsupported. Combined with the lumbar support's adaptive rotation as described above, it can further generate a suitable tilt angle to fit and support the waist, providing comfortable and effective lumbar support, improving user comfort, and protecting the health of the waist.

[0031] This solution integrates the independent rotation of the lumbar support and the backrest, and the linkage between the lumbar support and the backrest tilting down as the backrest leans back. It eliminates the need for switches and adjustments, and can automatically conform to the curves of the human back in different postures, preventing lumbar support and providing reasonable and comfortable support.

[0032] In addition to guiding the sliding motion of the motion seat, the guide seat can also rotate adaptively during the sliding motion of the motion seat to prevent interference. Since the motion seat and the backrest are set to rotate relative to each other, the backrest will not only cause the motion seat to slide, but also cause the motion seat to rotate slightly when it rotates. At this time, the guide seat needs to adapt to the change in the angle of the motion seat and rotate adaptively to ensure the smooth operation of the motion mechanism of this solution, which is also one of the foundations for achieving the above-mentioned beneficial effects. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the seat in a seated position according to an embodiment of the present invention. Figure 1 ;

[0034] Figure 2 This is a three-dimensional structural diagram of the seat in a seated position according to an embodiment of the present invention. Figure 2 ;

[0035] Figure 3 This is a side view of the seat in a seated position according to an embodiment of the present invention;

[0036] Figure 4 This is a side view of the seat in a reclining position according to an embodiment of the present invention;

[0037] Figure 5 This is a three-dimensional structural diagram of the seat in the reclining position according to an embodiment of the present invention. Figure 1 ;

[0038] Figure 6 This is a three-dimensional structural diagram of the seat in the reclining position according to an embodiment of the present invention. Figure 2 ;

[0039] Figure 7 This is a cross-sectional view of the chair in a seated position according to an embodiment of the present invention;

[0040] Figure 8 This is a cross-sectional view of the seat in a reclining position according to an embodiment of the present invention;

[0041] Figure 9 The explosion of the seat in the embodiment of the present invention Figure 1 ;

[0042] Figure 10 The explosion of the seat in the embodiment of the present invention Figure 2 ;

[0043] Figure 11 This is a three-dimensional structural diagram of the motion seat and guide seat in a seated state according to an embodiment of the present invention;

[0044] Figure 12 This is a cross-sectional view of the motion seat and guide seat in a seated position according to an embodiment of the present invention;

[0045] Figure 13 This is a three-dimensional structural diagram of the motion seat and guide seat in the lying position of the present invention in an embodiment;

[0046] Figure 14 This is a cross-sectional view of the motion seat and guide seat in a seated position according to an embodiment of the present invention;

[0047] Figure 15 The explosion of the lumbar support and exercise seat in the embodiments of the present invention Figure 1 ;

[0048] Figure 16 The explosion of the lumbar support and exercise seat in the embodiments of the present invention Figure 2 ;

[0049] Figure 17 This is a three-dimensional structural diagram of the control element and the limiting spring in an embodiment of the present invention;

[0050] Figure 18 This is a three-dimensional structural diagram of the seat in a seated position according to an embodiment of the present invention. Figure 3 .

[0051] The reference numerals in the attached drawings are as follows: seat 1; guide seat 2; main body 201; connecting part 202; backrest 3; support arm 31; rotating seat 32; motion seat 4; lumbar support 5; armrest seat 6; armrest 7; mounting seat 8; extension seat 9; chassis 10; support plate 11; elastic element connecting seat 12; receiving groove 13; lumbar motion module 14; reset elastic element 15; stop element 17; stop groove 18; control element 19; cam 20; knob 21; limiting spring 23; limiting protrusion 24. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] In the description of this invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] The specific embodiments of the present invention are as follows:

[0056] like Figure 1-6As shown in Figure 18, the present invention provides a seat, including a seat 1, on which a guide seat 2 and a backrest 3 are provided, both of which are rotatably disposed relative to the seat 1. The rotation points of the guide seat 2 and the backrest 3 are located at different positions on the seat 1. A motion seat 4 is provided between the guide seat 2 and the backrest 3, which is rotatably disposed relative to the backrest 3 and slidably disposed relative to the guide seat 2. The backrest 3 is configured such that when it rotates relative to the seat 1 in response to an external force, the motion seat 4 slides relative to the guide seat 2. The guide seat 2 is positioned relative to the seat 1. The rotation setting of 1 is configured such that the guide seat 2 can rotate adaptively when the motion seat 4 slides; the motion seat 4 is provided with a lumbar support 5, which is rotated relative to the motion seat 4 and is configured to rotate adaptively on the motion seat 4 in response to external force; when the backrest 3 tilts backward in response to external force, it causes the motion seat 4 to slide downward relative to the guide seat 2, the guide seat 2 rotates adaptively relative to the seat 1, and the lumbar support 5 moves from top to bottom closer to the seat 1, and the lumbar support 5 also rotates adaptively in response to external force to conform to the curve of the human waist and back.

[0057] The curves of the human back differ between sitting and lying positions. This design adapts to changes in the curves of the human back in different postures. Specifically, in this design, the backrest 3 and lumbar support 5 can rotate relative to the seat 1. That is, the rotation of both responds to the external force exerted by the user's back and can rotate relative to the seat 1 as the user's posture changes. At the same time, the backrest 3 and lumbar support 5 can rotate relatively independently. That is, the backrest 3 responds to the external force exerted by the user's back, and the lumbar support 5 responds to the external force exerted by the user's waist. When the curves of the human back change, the backrest 3 and lumbar support 5 can rotate independently to adapt to and conform to the curves of the human back, thereby providing more reasonable and comfortable support.

[0058] Furthermore, the backrest 3 and lumbar support 5 are linked through the motion seat 4 and guide seat 2. The backrest 3 drives the motion seat 4 to slide relative to the guide seat 2. When the backrest 3 tilts backward, the downward movement of the backrest 3 will cause the motion seat 4 to slide downward relative to the guide seat 2, which will also cause the lumbar support 5 to move downward closer to the seat 1, so that the position of the lumbar support 5 is lowered and placed in the gap between the human waist and the seat 1, preventing the waist from being unsupported. Combined with the fact that the lumbar support 5 can rotate adaptively as described above, it can further generate a suitable tilt angle to fit and support the human waist, so that the lumbar support 5 can provide comfortable and effective lumbar support, improve the comfort of use, and protect the health of the human waist.

[0059] This solution integrates the independent rotation of the lumbar support 5 and the backrest 3, and the linkage between the lumbar support 5 and the backrest 3 as the lumbar support 5 tilts back and moves downward. It eliminates the need for switches and adjustments, and can automatically conform to the curves of the human back and waist in different postures, prevent lumbar hunchback, and provide reasonable and comfortable support.

[0060] In addition to guiding the sliding motion of the motion seat 4, the guide seat 2 can also rotate adaptively when the motion seat 4 slides to prevent interference. Since the motion seat 4 and the backrest 3 are set to rotate relative to each other, when the backrest 3 rotates, it will not only drive the motion seat 4 to slide but also drive the motion seat 4 to rotate slightly. At this time, the guide seat 2 needs to adapt to the change in the angle of the motion seat 4 and rotate adaptively to ensure the smooth operation of the motion mechanism of this solution, which is also one of the foundations for achieving the above-mentioned beneficial effects.

[0061] The chair has a sitting position and a reclining position. In the sitting position, the backrest 3 is roughly vertical, and the user can sit on it normally for work or study. When switching from the sitting position to the reclining position, the backrest 3 tilts backward, the motion seat 4 slides down on the guide seat 2, and the lumbar support 5 moves from top to bottom towards the seat 1. At the same time, the lumbar support 5 adapts to tilt to conform to the lumbar curve of the human body in a reclining posture.

[0062] Specifically, the seat 1 supports the buttocks of the user, allowing the user to sit on it. Armrests 6 are fixedly installed at both ends of the lower surface of the seat 1, and the armrests 6 are equipped with armrests 7 for supporting the user's arms. The backrest 3 supports the back of the user and is positioned higher than the lumbar support 5, which supports the lower back. The backrest 3 is specifically connected to the armrests 6 located near the lumbar support 5. Two support arms 31 extend downwards and forwards from the lower end of the backrest 3, and the armrests 6 have rearward-extending mounting... The front end of the support arm 31 is rotatably connected to the rear end of the mounting base 8, allowing the backrest 3 and the armrest seat 6 to rotate relative to each other. The mounting base 8 is configured to move the rotation point of the backrest 3 to the hip position of the human body, that is, the rotation point of the backrest 3 is closer to the rotation point of the upper and lower body when the human body is tilted backward, so that the rotation of the backrest 3 better conforms to the human body and prevents back rubbing and waist slippage. At the same time, the lumbar support 5 is located between the rotation points on both sides of the backrest 3, so that the height of the lumbar support 5 can effectively support the sacrum and increase the comfort of support.

[0063] Furthermore, such as Figure 2 , 7 As shown in Figure 8, it also includes an extension seat 9 fixedly disposed relative to the seat 1. The extension seat 9 extends rearward to protrude rearward from the seat 1, and the rear end of the extension seat 9 is rotatably connected to the front end of the guide seat 2. A chassis 10 is also provided below the seat 1. The chassis 10 includes a support plate 11 fixedly connected to the seat 1. The extension seat 9 is directly fixedly connected to the rear end of the seat 1 or fixedly connected to the support plate 11 on the chassis 10. The extension seat 9 can be fixed to the seat 1 or fixed to the chassis 10. In this embodiment, the extension seat 9 is directly fixed to the seat 1. A groove is cut at the rear end of the lower surface of the seat 1. After the front part of the extension seat 9 is placed in the groove, the extension seat 9 is fixed to the seat 1 by screws. The extension seat 9 is located below the mounting seat 8 so that the rotation points of the backrest 3 and the guide seat 2 are offset. The backrest 3 is rotatably connected to the upper end of the motion seat 4; specifically, as shown in Figure 8. Figure 2 , 5 As shown in Figures 9 and 10, the backrest 3 is provided with a downwardly extending rotating seat 32, which is rotatably connected to the upper end of the motion seat 4; there is a gap between the rotating seat 32 and the upper end of the motion seat 4 to avoid the rotation of the upper end of the motion seat 4.

[0064] The linkage between the backrest 3 and the motion seat 4 requires the relative rotation of the guide seat 2 and the seat 1. In this case, it is sufficient for the backrest 3 and the motion seat 4 to be rotatably connected. Alternatively, the guide seat 2 and the seat 1 can be fixed relative to each other, but a connecting rod is required between the backrest 3 and the motion seat 4, with both ends of the connecting rod rotatably connected to the backrest 3 and the motion seat 4 respectively. This solution also achieves the effect of preventing motion interference, but it requires an additional connecting rod, increasing the cost of parts and assembly.

[0065] Furthermore, such as Figure 7-14 As shown, an elastic element (not shown) is provided between the motion seat 4 and the guide seat 2 to allow the backrest 3 to tilt and return to its original position. The motion seat 4 is a sleeve, fitted and slidably mounted on the guide seat 2. The guide seat 2 is L-shaped and includes an integral main body 201 and a connecting part 202. The connecting part 202 extends laterally and is rotatably connected to the extension seat 9 on the seat 1. The main body 201 extends vertically, and the motion seat 4 is fitted onto the main body 201 and slidably engaged with it. The elastic element is a compression spring, and is located on the motion seat... In the backrest 4 and guide seat 2, the two ends of the elastic element act on the motion seat 4 and guide seat 2 respectively; both the backrest 3 and guide seat 2 are provided with elastic element connecting seats 12, and the guide seat 2 is also provided with a receiving groove 13 for accommodating the elastic element; the sliding direction of the motion seat 4 is the length direction of the guide seat 2, and the guide seat 2 will rotate adaptively with the movement of the motion seat 4, keeping the sliding direction of the motion seat 4 still the length direction of the guide seat 2, and at the same time, ensuring that the elastic element always acts reasonably between the two, stably providing tilt and reset elastic force.

[0066] In addition, this solution can provide sacral support while also allowing the lumbar support 5 to be independently raised, lowered, and tilted.

[0067] like Figure 7-10As shown in Figures 15 and 16, the exercise seat 4 is equipped with a lumbar exercise module 14, and the lumbar support 5 is rotatably mounted on the lumbar exercise module 14. A reset elastic element 15 is provided between the lumbar exercise module 14 and the lumbar support 5. The reset elastic element 15 is a compression spring. The reset elastic element 15 acts on the lumbar support 5 and provides a spring force for the lumbar support 5 to rotate forward. The lower part of the lumbar support 5 is rotatably connected to the lumbar exercise module 14, and the point of action of the reset elastic element 15 on the lumbar support 5 is located above the rotation point of the lumbar support 5, so as to provide a spring force for the lumbar support 5 to rotate forward. The lumbar exercise module 14 is also slidably mounted on the exercise seat 4 along the length direction of the exercise seat 4, so that the lumbar support 5 has an independent lifting function, thereby adapting to the needs of different people.

[0068] It has multiple reclining positions for the backrest between sitting and reclining positions:

[0069] like Figure 7-14 As shown, a locking structure is provided between the motion seat 4 and the guide seat 2. The locking structure includes a locking element 17 and several locking grooves 18. The locking element 17 is disposed on one of the motion seat 4 or the guide seat 2, and the several locking grooves 18 are distributed on the other of the motion seat 4 or the guide seat 2 along the sliding direction of the motion seat 4. When the locking element 17 disengages from the locking grooves 18, the motion seat 4 can slide on the guide seat 2 and the backrest 3 can rotate relative to the seat 1. When the locking element 17 engages with the locking grooves 18, the movement of the motion seat 4 and the backrest 3 is locked, so that the motion seat 4 and the backrest 3 remain in the current position. Specifically, the locking element 17 is disposed on the motion seat 4, and the several locking grooves 18 are arranged on the guide seat 2 along the length direction of the guide seat 2. By locking and unlocking the motion seat 4 and the guide seat 2, a locking position is provided for the tilting of the backrest 3, and the user can stop the backrest 3 at different tilting angles as needed.

[0070] like Figure 9 , 10 As shown in Figures 15-17, a control element 19 is provided on the motion seat 4, and the control element 19 is rotatably arranged relative to the motion seat 4. The control element 19 is generally a rod, which also includes a cam 20 and a knob 21 located at its end. The cam 20 is configured to drive the stop element 17 to move toward the stop groove 18, and the knob 21 is configured to facilitate the user to rotate the control element 19. A spring-loaded reset element is also provided on the stop element 17 to provide a spring force for the stop element 17 to move away from the stop groove 18. In order to keep the control element 19 in a locked or unlocked state and to provide a range for locking and unlocking switching, a limiting spring 23 is also provided on the motion seat 4. The control element 19 has a limiting protrusion 24 protruding on the side of the cam 20, which corresponds to the limiting spring 23. When the control element 19 rotates, the limiting protrusion 24 passes over the limiting spring 23, thereby increasing the rotation range of the control element 19, keeping the control element 19 in a locked or unlocked state, and providing switching feedback.

[0071] When switching from a sitting to a reclining position, the backrest 3 tilts and rotates backward due to the force of the human back, with the support arm 31 rotating relative to the mounting base 8. As the backrest 3 rotates backward, the rotating base 32 moves backward and downward together. The motion seat 4 connected to the rotating base 32 is driven by the rotating base 32 to slide downward on the guide seat 2 and rotate relative to the rotating base 32. The rotating base 32 still drives the motion seat 4 to rotate slightly backward. This backward rotation will cause the guide seat 2 to rotate backward relative to the extension seat 9. The rotation of the guide seat 2 can adapt to this backward rotation and prevent motion interference. At the same time, the lumbar support 5 is adaptively rotated backward due to the force of the human waist to conform to the curve of the human waist.

Claims

1. A type of seat, characterized in that: The device includes a seat, on which are a guide seat and a backrest, both of which are rotatably mounted relative to the seat. The rotation points of the guide seat and the backrest are located at different positions on the seat. A motion seat is provided between the guide seat and the backrest, which is rotatably mounted relative to the backrest and slidably mounted relative to the guide seat. The backrest is configured to slide relative to the guide seat in response to an external force rotating relative to the seat. The rotation of the guide seat relative to the seat is configured to allow the guide seat to rotate adaptively when the motion seat slides. A lumbar support is provided on the motion seat, which is rotatably mounted relative to the motion seat and is configured to rotate adaptively on the motion seat in response to an external force. When the backrest tilts backward in response to an external force, it causes the motion seat to slide downward relative to the guide seat. The guide seat rotates adaptively relative to the seat, and the lumbar support moves from top to bottom towards the seat. The lumbar support also rotates adaptively in response to an external force to conform to the curve of the human lower back.

2. The seat according to claim 1, characterized in that: The exercise seat is equipped with a lumbar exercise module, and the lumbar support is rotatably mounted on the lumbar exercise module; a reset elastic element is provided between the lumbar exercise module and the lumbar support, and the reset elastic element acts on the lumbar support and gives the lumbar support a spring force to rotate forward.

3. The seat according to claim 2, characterized in that: The waist movement module is slidably mounted on the exercise seat along the length of the exercise seat.

4. The seat according to claim 1, characterized in that: A locking structure is provided between the motion seat and the guide seat. The locking structure includes a locking element and several locking slots. The locking element is disposed on one of the motion seat or the guide seat, and the several locking slots are distributed on the other motion seat or the guide seat along the sliding direction of the motion seat. When the locking element disengages from the locking slot, the motion seat can slide on the guide seat and the backrest can rotate relative to the seat. When the locking element engages with the locking slot, the movement of the motion seat and the backrest is locked, so that the motion seat and the backrest remain in the current position. The locking element is disposed on the motion seat, and the several locking slots are arranged on the guide seat along the length direction of the guide seat. A control element is provided on the motion seat, and the control element is rotatably disposed relative to the motion seat. The control element includes a cam, which is configured to drive the locking element to move toward the locking slot.

5. The seat according to claim 1, characterized in that: The seat is also equipped with armrests, and the backrest is rotatably connected to the armrests.

6. The seat according to claim 5, characterized in that: There are two armrests located on the left and right sides of the seat. The armrests have rearward-extending mounting bases, and the backrest is rotatably mounted on the mounting bases. The mounting bases are configured to move the rotation point of the backrest to the hip position of the human body.

7. The seat according to claim 1, characterized in that: It also includes an extension seat that is fixedly disposed relative to the seat, the extension seat extending rearward and the rear end being rotatably connected to the front end of the guide seat; a chassis is also provided below the seat, the chassis including a support plate fixedly connected to the seat, the extension seat being directly fixedly connected to the rear end of the seat or the extension seat being fixedly connected to the support plate on the chassis.

8. The seat according to claim 1, characterized in that: An elastic element is provided between the motion seat and the guide seat to allow the backrest to tilt and return to its original position.

9. The seat according to claim 8, characterized in that: The motion seat is a sleeve, which is sleeved and slidably mounted on the guide seat. The elastic element is disposed in the motion seat and the guide seat, and the two ends of the elastic element act on the motion seat and the guide seat respectively.

10. The seat according to claim 9, characterized in that: The guide seat is L-shaped and includes an integral main body and a connecting part. The connecting part extends laterally and is rotatably connected to the seat. The main body extends vertically and the motion seat is fitted onto the main body.

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