Chair

Abstract

Disclosed in the present invention is a chair, comprising a support member, a main body module, and a movement device. The support member is configured to be connected to a gas lift cylinder of the chair and rotatably connected to the main body module by means of a first rotating shaft. The main body module comprises a seat and a backrest rotatably connected to each other. The seat comprises a bottom shell having an accommodating space. The backrest is more inclined in a reclined state than in a normal state. The movement device is located in the accommodating space and rotatably connected to the bottom shell and the support member, providing stable support for rotation of the main body module. When the chair is in a resting state, the backrest is in the reclined state and the main body module rotates backward, the front end of the seat is tilted up, and the backrest is further reclined until knees and the heart are at a same horizontal level, thereby achieving a zero-gravity posture and providing a comfortable reclining experience. The present solution achieves the zero-gravity posture on office chairs in a more stable, reasonable, integrated, and modular manner.

Description

A type of seat Technical Field

[0001] This invention relates to the field of furniture, and in particular to an ergonomic chair. Background Technology

[0002] In modern work environments, prolonged sitting at a desk has numerous negative impacts on people's health, such as lower back pain and neck discomfort. Therefore, improving the comfort and functionality of office chairs has become an important development direction for the industry.

[0003] Traditional office chairs have relatively limited functions, mostly offering only basic features like height adjustment and reclining, which are insufficient to meet people's needs for comprehensive body support and relaxation during long hours of work. With rising living standards and increased health awareness, people expect office chairs to provide functions similar to the zero-gravity posture of electric sofas.

[0004] The zero-gravity posture of electric sofas can adjust the human body to a state similar to weightlessness in space, allowing for even pressure distribution across all parts of the body, effectively reducing spinal pressure, promoting blood circulation, and greatly alleviating physical fatigue. However, currently, this zero-gravity function is mainly used in electric sofas, and its application in the field of office chairs is still very limited.

[0005] This is mainly because the design of office chairs needs to consider more space constraints and the diversity of usage scenarios, and there are many challenges in directly transplanting the zero-gravity technology of electric sofas to office chairs. For example, office chairs require a more compact structural design, more precise posture adjustment control, and higher stability and durability. Technical issues

[0006] To address the aforementioned technical problems, this invention provides an ergonomically designed chair, comprising a base, a main module, and a motion device. The base connects to the chair's lifting gas spring and, via a first pivot, allows the main module to rotate and connect thereto. The main module includes a seat and a backrest rotatably connected. The seat includes a base shell with an accommodating space, and the backrest is more tilted than in its normal position when reclined. The motion device is located in the accommodating space and rotatably connected to the base shell and the base, providing stable support for the rotation of the main module. When the chair is in a resting state, the backrest is reclined and the main module rotates backward, the front end of the seat tilts up, and the backrest reclines further until the knees and heart are at the same level, thus achieving a zero-gravity posture and providing a comfortable reclining experience. Technical solutions

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

[0008] An ergonomic chair, comprising:

[0009] The base is configured as a support base for connecting the seat, and a first pivot is provided on the base;

[0010] The main module includes a seat and a backrest that are rotatably connected together. The seat includes a bottom shell with an accommodating space. A clearance groove is provided in the middle of the bottom of the bottom shell. The base enters the accommodating space through the clearance groove. The bottom shell is rotatably connected to the base through a first rotating shaft.

[0011] A motion device is set in the accommodating space. The two ends of the motion device are respectively rotatably mounted on the bottom shell and the base. The motion device is configured to provide stable support for the rotation of the base and the main module.

[0012] The chair back has a normal position and a reclining position; in the normal position, the chair back is roughly vertical, allowing the human body to sit normally; in the reclining position, the chair back tilts backward on the seat, allowing the human body to lie back.

[0013] The seat has a resting position. When the seat is in the resting position, the backrest is in a reclining position, the main module rotates relative to the base, the front of the seat is raised, and the backrest is further tilted back until the knees are at the same level as the heart.

[0014] In existing technologies, relying solely on the reclining of the chair back and the accompaniment of the seat is insufficient to achieve a zero-gravity posture. In this solution, the chair back and seat are treated as a single module, connected to the base via a first pivot. This allows the chair back to rotate independently relative to the seat, while the chair back and seat also rotate together on the base. Thus, when the chair back is reclined, the main module can tilt further backward, increasing the range of the body's fall. Simultaneously, the seat can lift the lower body, thereby lowering the height of the heart and increasing the height of the knees, ensuring that the knees and heart are at the same level, achieving a zero-gravity posture. In a zero-gravity posture, users will not experience numbness even after prolonged lying down. Furthermore, since the heart can supply blood to the entire body without overcoming much gravity, it reduces the pressure on the heart, improving the user's resting experience and promoting better health.

[0015] In this design, the base and motion device are enclosed within the main module, thereby increasing the chair's integrity and making the structure more compact. The purpose of using the seat and backrest as a single module is not only to achieve modularity but also to maximize the use of the relatively large chair. The modules that enable zero-gravity posture (base and motion device) are enclosed within the module, concealing them and maintaining the chair's appearance. This preserves the inherent integrity of an office chair. Furthermore, the sufficient internal volume of the base shell allows for a more compact overall structure, seamlessly integrating zero-gravity posture functionality into a basic office chair. Only in the resting state is a small portion of the base exposed within the base shell.

[0016] In addition, this solution does not have a traditional chassis. The chair seat in this solution integrates the chassis function into one unit. The base is not a traditional chassis, but only a support seat that connects and supports the main module and enables it to rotate.

[0017] Preferably, in the resting state, the main module tilts backward at an angle of 18-20° on the base. The backrest rotates relative to the seat at an angle of 30-40°. After the main module rotates further, the backrest will only tilt upward at about 30°, allowing the upper body to fall more downward, while the seat will tilt upward at about 20° to lift the lower body, thus achieving a zero-gravity posture. Even in chairs with poor rotation capabilities, the backrest will tilt backward at more than 20°. Combined with the backward tilt of the main module, this can largely achieve a zero-gravity effect.

[0018] Preferably, the motion device is rotatably mounted on the base via a second rotating shaft, and rotatably mounted on the bottom shell via a third rotating shaft. When the main module rotates backward on the base, the positions of the first and second rotating shafts are relatively fixed, while the position of the third rotating shaft relative to the first and second rotating shafts changes. The first, second, and third rotating shafts together form a state transition triangle. When switching to the resting state, the shape of the state transition triangle changes. The third rotating shaft can be located in front of or behind the second rotating shaft. When the third rotating shaft is in front of the second rotating shaft, the state transition triangle becomes smaller when the main module rotates backward; when the third rotating shaft is behind the second rotating shaft, the state transition triangle becomes larger when the main module rotates backward. The motion device acts on this state transition triangle to maintain stability when the shape of the state transition triangle changes.

[0019] Preferably, one end of the motion device is rotatably mounted on the bottom shell via a third rotating shaft, and the other end of the motion device is rotatably mounted on a first rotating shaft. Alternatively, the motion device can be directly mounted on the first rotating shaft. In this case, although the aforementioned state transition triangle is not present, it can still act on the bottom shell and base to maintain the stability of the main module's rotation.

[0020] Preferably, the chair seat also includes a footrest, which is retractable and located at the front of the seat. When the chair is in a resting position, the footrest extends forward out of the seat. The footrest is used to support the legs and feet, improving comfort during rest.

[0021] Preferably, in the resting position, the footrest tilts downwards from back to front, with an angle between the seat and the footrest; the front end of the seat is adjacent to the rear end of the footrest, and the junction of the seat and footrest forms an upward-protruding knee support. The angle between the seat and the footrest makes it more comfortable for the user to bend their legs while resting, and the upward-protruding knee support can support the bent knee and maintain the knee height, allowing the posture to be in a zero-gravity state.

[0022] Preferably, the base shell includes an upwardly protruding mounting seat, on which the chair back is rotatably mounted. Since this chair has no chassis, the way the chair back rotates differs from traditional office chairs; the chair back is directly mounted on the base shell, yet the same backrest tilting effect can still be achieved.

[0023] Preferably, the chair seat also includes a seat portion, which is slidably mounted on the base shell. The seat portion is rotatably connected to and linked with the backrest; when the backrest rotates backward, it causes the seat portion to slide forward. The seat portion is used to support the buttocks of the human body; the rotatable connection point between the seat portion and the backrest is located below the rotatable connection point between the backrest and the base shell, so the seat portion can be pushed forward when the backrest is reclined, thus making the backrest more comfortable when switched to the reclined position.

[0024] Preferably, the first pivot is located at the lower front of the base; and in the front-rear direction, the first pivot is closer to the middle of the base than the front end of the base; the support base includes a lifting gas spring and support feet, with the two ends of the lifting gas spring connected to the base and the support feet respectively. First, if the position of the first pivot is too far back, there is a risk of tipping over when the main module rotates backward. Second, if the position of the first pivot is too far forward, it is difficult for the user to drive the main module to rotate backward using only the force of falling backward, and the bottom shell located in front of the base will approach the base when rotating, and since the base is located inside the bottom shell, interference is likely to occur; therefore, this solution solves the above problems.

[0025] Preferably, the first pivot is located below the top of the lifting air column. Lowering the height of the main module's pivot point lowers the overall center of gravity and reduces the risk of the main module tipping over when rotating backward.

[0026] Preferably, the first rotating shaft is positioned coinciding with the lifting gas spring in the front-to-back direction. The lifting gas spring supports the base and the main module. This design aims to ensure that the rotation point of the main module and the support point are at the same front-to-back position, thereby solving the problems of tipping over and difficulty in driving the main module to rotate while lying down.

[0027] Preferably, the motion device includes an elastic element and a telescopic locking element. The elastic element has two ends respectively mounted on the bottom shell and the base and acts on the bottom shell and the base. The telescopic locking element has two ends respectively mounted on the bottom shell and the base and extends and retracts when the main module rotates relative to the base. The telescopic locking element is configured to selectively lock or unlock the relative rotation between the main module and the base. The elastic element is configured to provide a spring force for the main module to rotate forward in the resting state. When unlocked, the telescopic locking element can extend and retract with the rotation of the bottom shell and the base. After the telescopic locking element extends and retracts, it locks, thus keeping the main module in the rotated position. The elastic element can provide elastic cushioning when the main module rotates backward and can also provide resistance to avoid discomfort caused by rotating backward too quickly. In zero gravity, it is inconvenient for the user to use external force to reset and can only reset by sitting forward and shifting the center of gravity. Therefore, the elastic element can also provide a spring force when the user wants to reset.

[0028] Preferably, the elastic element and the telescopic locking element are parallel to each other; there are at least two elastic elements, which are symmetrically arranged on both sides of the telescopic locking element. The symmetrical arrangement of the elastic elements results in a more even application of elastic force, a more balanced buffering and reset, and a better user experience.

[0029] Preferably, the telescopic locking mechanism is a gas spring with a cushioning effect. The telescopic locking mechanism also provides cushioning, slowing down the speed at which the main module falls backward and improving the user experience.

[0030] As a preferred option, the telescopic locking component is a gas spring strut. The gas spring strut provides cushioning, locking, and telescopic effects; however, because it is somewhat similar to a hydraulic system, its telescopic speed is very slow. While this improves the user experience when tilting backward, it also makes resetting more difficult, thus requiring a more elastic resetting force from the elastic component.

[0031] Preferably, the elastic element is a spring.

[0032] Preferably, the motion device further includes a telescopic component, the two ends of which are rotatably connected to the bottom shell and the base, respectively. An elastic element is sleeved on the telescopic component, and the telescopic component is configured to limit and guide the elastic element. This is used to install the elastic element and to guide and limit its movement.

[0033] Preferably, the motion device includes a drive component and a follower mechanism. The two ends of the follower mechanism are rotatably mounted on the base and the bottom shell, respectively. The drive component is connected to the follower mechanism and drives its movement. The follower mechanism is arranged in the front-to-back direction and, driven by the drive component, rotates the main module and the base. The drive component is controlled by the user, making the process of switching to the resting state more controllable and maintaining stability during movement.

[0034] Preferably, the follower mechanism is a lead screw and nut assembly, with the lead screw being driven by the drive component; or, the nut being driven by the drive component. The motion device can be an electric actuator.

[0035] Preferably, the driving component is a motor.

[0036] Preferably, the base is provided with a first protrusion and the bottom shell is provided with a second protrusion. Both the first and second protrusions protrude into the accommodating space. The first protrusion is provided with a second rotating shaft and the second protrusion is provided with a third rotating shaft. The two ends of the moving device are rotatably connected to the first and second protrusions through the second and third rotating shafts, respectively.

[0037] Preferably, the first and second protrusions are arranged at an interval and are parallel to each other. Specifically, they are parallel to each other in the non-resting state; the second protrusion can be in front of or behind the first protrusion, corresponding to the position of the second and third rotating shafts. Different relative positions will cause different changes in the shape of the state transition triangle, but the effect is the same.

[0038] Preferably, the first boss has a first mounting gap in its middle, and the second boss has a second mounting gap in its middle; there are two second and three third rotating shafts, with the two second rotating shafts inserted into the first boss and their ends protruding at the first mounting gap. Similarly, the two third rotating shafts protrude at the second mounting gap. The two ends of the motion device are respectively located in the first and second mounting gaps, and the protruding ends of the second and third rotating shafts are inserted into the motion device. Since the interior of the motion device may not be large enough for the rotating shafts to pass through, the motion device is rotated and installed by setting mounting gaps and allowing the rotating shafts to protrude on both sides.

[0039] Preferably, the bottom shell covers the base, with a gap between the base and the bottom shell. The gaps in the front-to-back direction are only 2mm, and the gaps in the left-to-right direction are only 3mm, thus improving the overall integrity and preventing fingers from being pinched.

[0040] Preferably, the bottom of the shell has a surrounding plate protruding upward around the clearance groove, the base is located between the surrounding plates, and the first rotating shaft is located between the surrounding plate and the base.

[0041] Preferably, the thickness of the base decreases from back to front, and the upper part of the base has an upward-sloping surface. Since the bottom shell rotates backward and approaches the base when switching to the resting state, space must be left at the front of the base to allow for the bottom shell and the second protrusion located at the front of the base. Beneficial effects

[0042] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0043] In existing technologies, relying solely on the reclining of the chair back and the accompaniment of the seat is insufficient to achieve a zero-gravity posture. In this solution, the chair back and seat are treated as a single module, connected to the base via a first pivot. This allows the chair back to rotate independently relative to the seat, while the chair back and seat also rotate together on the base. Thus, when the chair back is reclined, the main module can tilt further backward, increasing the range of the body's fall. Simultaneously, the seat can lift the lower body, thereby lowering the height of the heart and increasing the height of the knees, ensuring that the knees and heart are at the same level, achieving a zero-gravity posture. In a zero-gravity posture, users will not experience numbness even after prolonged lying down. Furthermore, since the heart can supply blood to the entire body without overcoming much gravity, it reduces the pressure on the heart, improving the user's resting experience and promoting better health.

[0044] In this design, the base and motion device are enclosed within the main module, thereby increasing the chair's integrity and making the structure more compact. The purpose of using the seat and backrest as a single module is not only to achieve modularity but also to maximize the use of the relatively large chair. The modules that enable zero-gravity posture (base and motion device) are enclosed within the module, concealing them and maintaining the chair's appearance. This preserves the inherent integrity of an office chair. Furthermore, the sufficient internal volume of the base shell allows for a more compact overall structure, seamlessly integrating zero-gravity posture functionality into a basic office chair. Only in the resting state is a small portion of the base exposed within the base shell.

[0045] In addition, this solution does not have a traditional chassis. The chair seat in this solution integrates the chassis function into one unit. The base is not a traditional chassis, but only a support seat that connects and supports the main module and enables it to rotate. Attached Figure Description

[0046] Figure 1 is a schematic diagram of the user sitting on the chair with the backrest in its normal state in Embodiment 1 of the present invention;

[0047] Figure 2 is a side view of the seat in the reclining state of the chair back in Embodiment 1 of the present invention;

[0048] Figure 3 is a side view of the seat in the resting state in Embodiment 1 of the present invention;

[0049] Figure 4 is a schematic diagram of the user lying on the chair in a zero-gravity posture in a resting state in Embodiment 1 of the present invention.

[0050] Figure 5 is a schematic diagram of the bottom shell rotating on the base in Embodiment 1 of the present invention;

[0051] Figure 6 is a three-dimensional structural diagram of the motion device in the bottom shell in Embodiment 1 of the present invention;

[0052] Figure 7 is a three-dimensional structural diagram of the bottom shell and base in Embodiment 1 of the present invention;

[0053] Figure 8 is a three-dimensional structural diagram of the motion device installed in the bottom shell in the resting state of the present invention in Embodiment 1;

[0054] Figure 9 is a schematic diagram of the state transition triangle changes when the bottom shell rotates in Embodiment 1 of the present invention;

[0055] Figure 10 is a three-dimensional structural diagram of the bottom shell in Embodiment 1 of the present invention;

[0056] Figure 11 is a three-dimensional structural diagram of the base and lifting air column in Embodiment 1 of the present invention;

[0057] Figure 12 is a three-dimensional structural diagram of the base and lifting air column in Embodiment 1 of the present invention (II).

[0058] Figure 13 is a three-dimensional structural diagram of the connection between the motion device and the base in Embodiment 1 of the present invention;

[0059] Figure 14 is a three-dimensional structural diagram of the telescopic component in Embodiment 1 of the present invention;

[0060] Figure 15 is a three-dimensional structural diagram of the motion device in the bottom shell in Embodiment 2 of the present invention;

[0061] Figure 16 is a three-dimensional structural diagram of the motion device in the resting state of the present invention installed in the bottom shell in Embodiment 2.

[0062] The reference numerals in the attached drawings are as follows: base 1; lifting gas spring 2; first rotating shaft 3; main body module 4; seat 41; backrest 42; bottom shell 5; accommodating space 51; clearance groove 52; mounting base 53; surrounding plate 54; footrest 6; seat part 7; second rotating shaft 8; third rotating shaft 9; first protrusion 11; first mounting gap 111; third mounting gap 112; second protrusion 12; second mounting gap 121; fourth mounting gap 122; elastic element 13; telescopic locking element 14; mounting part 141; telescopic element 15; sleeve part 151; transverse sleeve part 1511; longitudinal sleeve part 1512; telescopic rod 152; abutment part 153; arc-shaped groove 154; driving element 16; follower mechanism 17; lead screw 171; lead nut 172; rotating element 18. Embodiments of the present invention

[0063] Detailed Implementation

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The specific embodiments of the present invention are as follows: Example

[0068] As shown in Figures 1-5, the present invention provides an ergonomic chair, comprising:

[0069] The base 1 is configured as a support base for connecting the seat, and the base 1 is provided with a first rotating shaft 3;

[0070] The main module 4 includes a seat 41 and a backrest 42 that are rotatably connected together. The seat 41 includes a bottom shell 5 with an accommodating space 51. An clearance groove 52 is provided at the middle of the bottom of the bottom shell 5. The base 1 enters the accommodating space 51 through the clearance groove 52. The bottom shell 5 is rotatably connected to the base 1 through a first rotating shaft 3.

[0071] A motion device is set in the accommodating space 51. The two ends of the motion device are respectively rotatably mounted on the bottom shell 5 and the base 1. The motion device is configured to provide stable support for the rotation of the base 1 and the main body module 4.

[0072] The chair back 42 has a normal state and a reclining state; in the normal state, the chair back 42 is roughly vertical, so that the human body can sit normally; in the reclining state, the chair back 42 tilts backward on the seat 41, so that the human body can lie back.

[0073] The seat has a resting position. When the seat is in the resting position, the backrest 42 is in a reclining position, the main body module 4 rotates relative to the base 1, the front end of the seat 41 is raised, and the backrest 42 is further tilted back until the knees and heart are at the same level.

[0074] In existing technologies, relying solely on the reclining of the backrest 42 and the accompaniment of the seat 41 is insufficient to achieve a zero-gravity posture. In this solution, the seat 41 and backrest 42 are treated as a single module, connected to the base 1 via the first pivot 3. This allows the backrest 42 to rotate independently relative to the seat 41, while the backrest 42 and seat 41 also rotate together on the base 1. Thus, when the backrest 42 is reclined, the main module 4 can further tilt backward, increasing the range of the body's fall. Simultaneously, the seat 41 can lift the lower body, thereby lowering the heart height and increasing the knee height, ensuring that the knees and heart are at the same level, achieving a zero-gravity posture. In a zero-gravity posture, users will not experience numbness even after prolonged lying down, and because the heart can supply blood to the whole body without overcoming much gravity, it also reduces the pressure on the heart, improving the user's resting experience and promoting better health.

[0075] In this design, the base 1 and motion device are enclosed within the main module 4, thereby increasing the integrity of the chair and making the structure more compact. The purpose of using the seat 41 and backrest 42 as the same module is not only to achieve modularity of the chair, but also to make full use of the relatively large seat 41 by enclosing the modules (base 1 and motion device) that enable zero-gravity posture, thus hiding them and maintaining the appearance of the chair itself and preserving the integrity of the original office chair. Furthermore, the sufficient internal volume of the bottom shell 5 allows for a more compact overall structure, thus seamlessly integrating zero-gravity posture functionality into an office chair with basic functions. Only in the resting state will a small portion of the base 1 be exposed above the bottom shell 5.

[0076] In addition, there is no traditional chassis in this solution. The chair seat 41 in this solution integrates the chassis function into one unit. The base 1 is not a traditional chassis, but only a support seat that connects to the lifting gas spring 2 in the support base and enables the main module 4 to rotate.

[0077] Specifically, in the resting state, the main body module 4 tilts backward at an angle of 18-20° on the base 1, and the backrest 42 rotates relative to the seat 41 at an angle of 30-40°. After the main body module 4 rotates further, the backrest 42 will only tilt upward at about 30°, causing the upper body of the human body to fall more, while the seat 41 will tilt upward at about 20° to lift the lower body of the human body, thus achieving a zero-gravity posture. Even if the backrest 42 of the seat with poor rotation ability tilts backward at more than 20°, at this time, combined with the backward tilt angle of the main body module 4, the effect of zero gravity can be roughly achieved.

[0078] To achieve a zero-gravity posture during rest, the footrest 6 is even more effective. As shown in Figure 4, the seat 41 is also equipped with a footrest 6, which is retractable and located at the front of the seat 41. When the seat is in a resting state, the footrest 6 can extend forward from the seat 41 to support the legs and feet, improving comfort during rest. The footrest 6 can also be folded back into the seat 41 when the user is sitting normally. Furthermore, in the resting state, the footrest 6 tilts downward from back to front, forming an angle between the seat 41 and the footrest 6. The front end of the seat 41 is adjacent to the rear end of the footrest 6, and the junction of the seat 41 and the footrest 6 forms an upwardly protruding knee support. The angle between the seat 41 and the footrest 6 makes it more comfortable for the user's legs to bend during rest, and the upwardly protruding knee support can support the bent knee and maintain the knee height, allowing the posture to be in a zero-gravity state.

[0079] Unlike traditional chairs, the backrest 42 is connected to the seat 41. Specifically, as shown in Figures 2, 3, and 6-10, the base shell 5 includes an upwardly protruding mounting seat 53, on which the backrest 42 is rotatably mounted. Since this chair lacks a chassis, the rotation method of the backrest 42 differs from that of traditional office chairs; the backrest 42 is directly rotatably mounted on the base shell 5, achieving the same reclining effect. The seat 41 also includes a seat portion 7, which slides back and forth on the base shell 5. The seat portion 7 extends upward and rotatably connects to and is linked with the lower end of the backrest 42. When the backrest 42 rotates backward, it causes the seat portion 7 to slide forward. The seat portion 7 supports the buttocks. The rotatable connection point between the seat portion 7 and the backrest 42 is located below the rotatable connection point between the backrest 42 and the mounting seat 53, allowing the seat portion 7 to be pushed forward when the backrest 42 is reclined, thus making the reclining position more comfortable.

[0080] Furthermore, the bottom shell 5 covers the base 1, and there is a gap between the base 1 and the bottom shell 5. Specifically, the gap in the front-to-back direction is only 2mm, and the gap in the left-to-right direction is only 3mm. Therefore, the overall integrity is better and it prevents fingers from being pinched. The bottom of the bottom shell 5 has a surrounding plate 54 protruding upward around the relief groove 52. The base 1 is located between the surrounding plates 54. The first rotating shaft 3 is located between the surrounding plates 54 and the base 1. The first rotating shaft 3 is arranged in the left-to-right direction, and there are two first rotating shafts 3. The two first rotating shafts 3 are located on the left and right end faces of the base 1 respectively and are rotatably connected to the left and right plates of the surrounding plate 54.

[0081] The location of the first rotating shaft 3 also affects the stability of switching to the resting state. As shown in Figures 9-12, in this embodiment, the first rotating shaft 3 is located at the lower front part of the base 1; and in the front-back direction, the first rotating shaft 3 is closer to the middle of the base 1 than the front end of the base 1; the support base includes a lifting gas spring 2 and a support foot, with the two ends of the lifting gas spring 2 connected to the base 1 and the support foot respectively; in the height direction, the first rotating shaft 3 is located below the top of the lifting gas spring 2, and in the front-back direction, the position of the first rotating shaft 3 coincides with that of the lifting gas spring 2; firstly, if the position of the first rotating shaft 3 is too far back, there is a risk of tipping over when the main module 4 rotates backward; secondly, if the position of the first rotating shaft 3 is too far forward, it is difficult for the user to drive the main module 4 to rotate backward using only the force of falling backward, and the bottom shell 5 located in front of the base 1 will approach the base 1 when rotating, and the base 1 is located inside the bottom shell 5, so interference is likely to occur; therefore, this solution solves the above problems. The position of the first rotating shaft 3 in the height direction lowers the rotation point height of the main module 4, thereby lowering the overall center of gravity and reducing the risk of tipping over when the main module 4 rotates backward. The lifting air strut 2 is used to support the base 1 and the main module 4. By adjusting the position of the first rotating shaft 3 in the front-rear direction, the rotation point of the main module 4 and the support point are positioned at the same front-rear position as much as possible, thus solving the problems of tipping over and difficulty in driving the main module 4 to rotate while lying down. At the same time, as shown in Figures 7 and 9, the length of the base 1 protruding forward beyond the lifting air strut 2 is less than the length of its protrusion backward beyond the lifting air strut 2.

[0082] Furthermore, the motion device is rotatably mounted on the base 1 via the second rotating shaft 8, and rotatably mounted on the bottom shell 5 via the third rotating shaft 9. When the main body module 4 rotates backward on the base 1, the positions of the first rotating shaft 3 and the second rotating shaft 8 are relatively fixed, while the position of the third rotating shaft 9 relative to the first rotating shaft 3 and the second rotating shaft 8 changes. The first rotating shaft 3, the second rotating shaft 8, and the third rotating shaft 9 together form a state transition triangle. When switching to the resting state, the shape of the state transition triangle changes. The third rotating shaft 9 can be located in front of the second rotating shaft 8 or behind the second rotating shaft 8. When the third rotating shaft 9 is located in front of the second rotating shaft 8, the state transition triangle becomes smaller when the main body module 4 rotates backward. When the third rotating shaft 9 is located behind the second rotating shaft 8, the state transition triangle becomes larger when the main body module 4 rotates backward. The motion device acts on the state transition triangle to ensure stability when the shape of the state transition triangle changes.

[0083] In addition, other configurations of the motion device are also feasible. For example, one end of the motion device can be rotatably mounted on the bottom shell 5 via the third rotating shaft 9, and the other end of the motion device can be rotatably mounted on the first rotating shaft 3. That is, the motion device can also be directly mounted on the first rotating shaft 3. In this case, although there is no state transition triangle as mentioned above, it can still act on the bottom shell 5 and the base 1 to maintain the stability of the rotation of the main module 4. In this embodiment, the first configuration of the motion device is selected.

[0084] The installation of the second rotating shaft 8 and the third rotating shaft 9 is as follows:

[0085] As shown in Figures 6 and 8-12, a first protrusion 11 is provided on the base 1, and a second protrusion 12 is provided on the bottom shell 5. Both the first protrusion 11 and the second protrusion 12 protrude into the accommodating space 51. A second rotating shaft 8 is provided on the first protrusion 11, and a third rotating shaft 9 is provided on the second protrusion 12. The two ends of the moving device are rotatably connected to the first protrusion 11 and the second protrusion 12 through the second rotating shaft 8 and the third rotating shaft 9, respectively. The first protrusion 11 and the second protrusion 12 are arranged at intervals and are parallel to each other, specifically, they are parallel to each other in the non-resting state. The second protrusion 12 can be located in front of or behind the first protrusion 11, corresponding to the positions of the second and third rotating shafts 9. Different relative positions will result in different changes in the shape of the state transition triangle, but the effect is the same. In this embodiment, the second protrusion 12 is located in front of the first protrusion 11, that is, the third rotating shaft 9 is located in front of the second rotating shaft 8. When switching to the resting state, the third rotating shaft 9 moves upward and backward and approaches the second rotating shaft 8, thereby changing the shape of the state transition triangle and reducing its area. From back to front, the thickness of the base 1 decreases, and the upper part of the base 1 has an upwardly inclined slope. Since the bottom shell 5 will rotate backward and approach the base 1 when switching to the resting state, space needs to be left in front of the base 1 to avoid the bottom shell 5 and the second protrusion located in front of the base 1. 12.

[0086] The motion device is as follows:

[0087] As shown in Figures 6 and 8-14, the motion device includes an elastic element 13 and a telescopic locking element 14 arranged in the front-back direction. The two ends of the elastic element 13 are respectively disposed on the bottom shell 5 and the base 1 and act on the bottom shell 5 and the base 1. The two ends of the telescopic locking element 14 are respectively disposed on the bottom shell 5 and the base 1 and extend and retract when the main body module 4 rotates relative to the base 1. The telescopic locking element 14 is configured to selectively lock or unlock the relative rotation between the main body module 4 and the base 1. The elastic element 13 is configured to provide elastic force for the main body module 4 to rotate forward from the resting state. When unlocked, the telescopic locking element 14 can extend and retract with the rotation of the bottom shell 5 and the base 1. After the telescopic locking element 14 extends and retracts, it locks, so that the main body module 4 can stay in the rotated position. The elastic element 13 can provide elastic buffer when the main body module 4 rotates backward and can also provide resistance to avoid discomfort caused by rotating backward too quickly. In the zero-gravity state, it is inconvenient for the user to use external force to reset and can only sit forward and reset by switching the center of gravity. Therefore, the elastic element 13 can also provide elastic force when the user wants to reset.

[0088] Specifically, the elastic element 13 is a spring, and the telescopic locking element 14 is a gas spring strut with a buffering effect. The gas spring strut has buffering, locking, and telescopic effects. The telescopic locking element 14 can also provide buffering, slowing down the speed of the main module 4 when it falls backward, thus improving the user experience. Since the gas spring strut is somewhat similar to a hydraulic effect, its telescopic speed is very slow. Although it can improve the user experience when falling backward, it will also be more difficult to reset. Therefore, the reset force provided by the elastic element 13 is more necessary. The elastic element 13 and the telescopic locking element 14 are parallel to each other. There are at least two elastic elements 13, which are symmetrically arranged on both sides of the telescopic locking element 14. The symmetrical arrangement of the elastic elements 13 makes the application of elastic force more balanced, and the buffering and reset are more balanced, resulting in a better user experience.

[0089] The motion device also includes a telescopic member 15, with its two ends rotatably connected to the bottom shell 5 and the base 1, respectively. An elastic member 13 is sleeved on the telescopic member 15. The telescopic member 15 is configured to limit and guide the elastic member 13. Specifically, the telescopic member 15 includes a sleeve 151 and a telescopic rod 152. The sleeve 151 includes a transverse sleeve portion 1511 and a longitudinal sleeve portion 1512. The telescopic rod 152 is inserted into the longitudinal sleeve portion 1512. The end of the telescopic rod 152 protruding from the sleeve 151 has an abutment portion 153 with an arc-shaped groove 154. The transverse sleeve portion 1511 is sleeved on the second rotating shaft 8, and the abutment portion 153 abuts against the third rotating shaft 9, with the third rotating shaft 9 located in the arc-shaped groove 154. The elastic member 13 abuts between the transverse sleeve portion 1511 and the abutment portion 153.

[0090] The first boss 11 has a first mounting gap 111 in the middle, and the second boss 12 has a second mounting gap 121 in the middle; there are two second rotating shafts 8 and two third rotating shafts 9. The two second rotating shafts 8 are inserted into the upper end of the first boss 11 and both protrude at the first mounting gap 111. Similarly, the two third rotating shafts 9 protrude at the second mounting gap 121; the two ends of the telescopic locking member 14 are respectively set in the first mounting gap 111 and the second mounting gap 121. Both ends of the telescopic locking member 14 are provided with mounting portions 141. The mounting portions 141 protrude in the left and right direction and are sleeve-shaped. The protruding ends of the second rotating shafts 8 and the third rotating shafts 9 are inserted into the mounting portions 141. The first boss 11 also has a third mounting gap 112, and the second boss 12 also has a fourth mounting gap 122. There are two of each of the third mounting gap 112 and the fourth mounting gap 122. The two ends of the telescopic member 15 are located in the third mounting gap 112 and the fourth mounting gap 122, respectively, and are connected to the second rotating shaft 8 exposed at the third mounting gap 112 and the third rotating shaft 9 exposed at the fourth mounting gap 122, respectively. The transverse sleeve portion 1511 of the telescopic member 15 is located at the third mounting gap 112, and the abutting portion 153 of the telescopic member 15 is located at the fourth mounting gap 122. The first boss 11 and the second boss 12 each include four protruding portions with shaft holes under the division of the mounting gaps.

[0091] Example 2: The only difference between this example and Example 1 is the motion device. In this example, the motion device includes a drive component 16 and a follower mechanism 17; specifically:

[0092] As shown in Figures 15 and 16, the motion device includes a drive component 16 and a follower mechanism 17. The two ends of the follower mechanism 17 are rotatably mounted on the base 1 and the bottom shell 5, respectively. The drive component 16 is connected to the follower mechanism 17 and is used to drive the follower mechanism 17 to move. The follower mechanism 17 is arranged in the front-back direction. Under the drive of the drive component 16, the follower mechanism 17 drives the main body module 4 and the base 1 to rotate. The drive component 16 is controlled by the user, making the process of switching to the resting state more controllable and also maintaining stability during movement.

[0093] The motion device can be an electric actuator, where the driving component 16 is a motor, and the follower mechanism 17 is a lead screw and nut assembly. The lead screw 171 is connected to the driving component 16 and rotates together on the third rotating shaft 9, while the nut 172 is rotatably connected to the second rotating shaft 8. Alternatively, the nut 172 can be connected to the driving component 16, with other structures modified accordingly. The driving component 16 is fixedly connected to a rotating component 18, which is positioned in the second mounting gap 121. The ends of the two third rotating shafts 9 are inserted into the rotating component 18. The end of the follower mechanism 17 furthest from the driving component 16 is located in the first mounting gap 111, where the ends of the two second rotating shafts 8 are inserted.

Claims

1. A seat, characterized by include: The base is configured as a support base for connecting the seat, and a first pivot is provided on the base; The main module includes a seat and a backrest that are rotatably connected together. The seat includes a bottom shell with an accommodating space. A clearance groove is provided in the middle of the bottom of the bottom shell. The base enters the accommodating space through the clearance groove. The bottom shell is rotatably connected to the base through a first rotating shaft. A motion device is set in the accommodating space. The two ends of the motion device are respectively rotatably mounted on the bottom shell and the base. The motion device is configured to provide stable support for the rotation of the base and the main module. The chair back has a normal position and a reclining position; in the normal position, the chair back is roughly vertical, allowing the human body to sit normally; in the reclining position, the chair back tilts backward on the seat, allowing the human body to lie back. The seat has a resting position. When the seat is in the resting position, the backrest is in a reclining position, the main module rotates relative to the base, the front of the seat is raised, and the backrest is further tilted back until the knees are at the same level as the heart.

2. The seat of claim 1, wherein: In the resting state, the main module tilts backward at an angle of 18-20° on the base.

3. The seat of claim 1, wherein: The motion device is rotatably mounted on the base via the second rotating shaft, and the motion device is rotatably mounted on the bottom shell via the third rotating shaft; when the main module rotates backward on the base, the positions of the first rotating shaft and the second rotating shaft are relatively fixed, while the position of the third rotating shaft relative to the first rotating shaft and the second rotating shaft changes.

4. The seat of claim 1, wherein: One end of the motion device is rotatably mounted on the bottom shell via a third rotating shaft, and the other end of the motion device is rotatably mounted on a first rotating shaft.

5. The seat of claim 1, wherein: The chair seat is also equipped with a footrest, which is retractable and located at the front of the seat. When the chair is in a resting position, the footrest extends forward out of the seat.

6. The seat of claim 5, wherein: In the resting position, the footrest tilts downwards from back to front, with an angle between the seat and the footrest; the front end of the seat is adjacent to the rear end of the footrest, and the junction of the seat and the footrest forms an upward-protruding knee support.

7. The seat of claim 1, wherein: The base includes an upwardly projecting mounting seat, on which the chair back is rotatably mounted.

8. The seat of claim 7, wherein: The chair seat also includes a seat section, which is slidably mounted on the bottom shell. The seat section is rotatably connected to and linked with the chair back; when the chair back rotates backward, it drives the seat section to slide forward.

9. The seat of claim 1, wherein: The first pivot is located at the lower front part of the base; and in the front-rear direction, the first pivot is closer to the middle of the base than the front end of the base; the support base includes a lifting air rod and a support foot, with the two ends of the lifting air rod connected to the base and the support foot respectively.

10. The seat of claim 9, wherein: The first pivot is located below the top of the lifting rod; in the front-back direction, the position of the first pivot coincides with that of the lifting rod.

11. The seat of claim 1, wherein: The motion device includes an elastic element and a telescopic locking element. The elastic element has two ends respectively disposed on the bottom shell and the base and acts on the bottom shell and the base. The telescopic locking element has two ends respectively disposed on the bottom shell and the base and extends and retracts when the main module rotates relative to the base. The telescopic locking element is configured to selectively lock or unlock the relative rotation between the main module and the base. The elastic element is configured to provide a spring force for the main module to rotate forward in the resting state.

12. The seat of claim 11, wherein: The elastic element and the telescopic locking element are parallel to each other; there are at least two elastic elements, which are symmetrically arranged on both sides of the telescopic locking element.

13. The seat of claim 11, wherein: The telescopic locking element is a gas spring with a cushioning effect; or, the telescopic locking element is a gas spring strut with a locking function.

14. The seat of claim 11, wherein: The motion device also includes a telescopic component, the two ends of which are rotatably connected to the bottom shell and the base, respectively. An elastic element is sleeved on the telescopic component, and the telescopic component is configured to limit and guide the elastic element.

15. The seat of claim 1, wherein: The motion device includes a drive component and a follower mechanism. The drive component is a motor. The two ends of the follower mechanism are rotatably mounted on the base and the bottom shell, respectively. The drive component is connected to the follower mechanism and is used to drive the follower mechanism to move. The follower mechanism is arranged in the front-back direction. Under the drive of the drive component, the follower mechanism drives the main module and the base to rotate.

16. The seat of claim 15, wherein: The follower mechanism is a lead screw and lead nut assembly, with the lead screw being connected to the driving component in a transmission manner; or, the lead nut being connected to the driving component in a transmission manner.

17. The seat of claim 1, wherein: The base is provided with a first protrusion, and the bottom shell is provided with a second protrusion. Both the first and second protrusions protrude into the accommodating space. The first protrusion is provided with a second rotating shaft, and the second protrusion is provided with a third rotating shaft. The two ends of the moving device are rotatably connected to the first and second protrusions through the second and third rotating shafts, respectively.

18. The seat of claim 17, wherein: The first and second protrusions are arranged at intervals and are parallel to each other.

19. The seat of claim 18, wherein: The first boss has a first mounting gap in the middle, and the second boss has a second mounting gap in the middle; there are two second and three third rotating shafts. The two second rotating shafts are inserted into the first boss and their ends are exposed at the first mounting gap. Similarly, the two third rotating shafts are exposed at the second mounting gap. The two ends of the motion device are respectively set in the first mounting gap and the second mounting gap, and the exposed ends of the second and third rotating shafts are inserted into the motion device.

20. The seat of claim 1, wherein: The bottom shell covers the base, and there is a gap between the base and the bottom shell; a surrounding plate protrudes upward around the bottom of the bottom shell around the clearance groove, the base is located between the surrounding plates, and the first rotating shaft is located between the surrounding plate and the base.

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