Multi-state adjustable seat

Abstract

The invention provides a multi-state adjusting seat which comprises a waist rest assembly, a chair back assembly, a chair seat module and a transmission piece, back connecting pieces in the waist rest assembly and the chair back assembly are rotationally connected with the chair seat module, a transmission rod is rotationally connected with the waist rest assembly and the back connecting pieces, and the waist rest assembly, the chair back assembly and the transmission rod form a four-connecting-rod mechanism. A backrest assembly in the chair back assembly is arranged on a back frame through a sliding rotating structure, a transmission rod is also rotationally connected with the back frame and the backrest assembly to form a movable three-connecting-rod mechanism, and a locking device is arranged on the sliding rotating structure to control the movement and locking of the three-connecting-rod mechanism; through cooperation of the four-connecting-rod mechanism and the three-connecting-rod mechanism, switching among a normal sitting state, a first tipping state and a second tipping state is achieved, in the first tipping state, the included angle between the waist rest assembly and the backrest assembly is minimum so as to adapt to the half-lying working posture, and in the second tipping state, the included angle between the waist rest assembly and the backrest assembly is minimum so as to adapt to the half-lying working posture. The included angle between the waist rest assembly and the backrest assembly is increased again to adapt to the lying rest posture.

Description

Technical Field

[0001] The invention relates to the field of furniture, and in particular to a multi-state adjustable seat. Background Art

[0002] As one of the most common pieces of furniture, the improvement of chair comfort is becoming more and more mature. For example, the traditional chair back can be divided into a lumbar support and a backrest to provide targeted support for the back and waist of the human body. In this way, the lumbar support and backrest can adapt to the different curves of the waist and back, making the two fit the waist and back better and providing more comfortable waist and back support.

[0003] However, such improvements are often only aimed at normal sitting and working scenarios, where the user sits upright on the chair, and the lumbar support is more prominently supported on the human waist relative to the backrest; but in fact, there are many usage scenarios for chairs, and manufacturers have not considered all of them, and the existing chairs have not made more complete improvements; for example, the frequency of users sitting upright to work is getting less and less, and instead they are lying on the chair, working in a relatively relaxed posture more and more. Users also entertain, play with mobile phones, take short rests, etc. in this posture. Since the existing chairs can only support sitting upright to work and lying down to rest, it is impossible to achieve a semi-reclining support posture. Therefore, the user will have an empty waist in the semi-reclining posture, and his waist is difficult to be effectively supported, which in turn causes waist fatigue, and the fatigue accumulates over time and causes strain and injury.

[0004] For different usage scenarios, the supporting surface formed by the backrest and the lumbar support or the curved shape that fits the human waist and back should change to adapt to different postures of the human body in different scenarios, especially the need to switch between sitting upright, semi-reclining and lying states. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a multi-state adjustable seat, including a lumbar support assembly, a backrest assembly, a seat module and a transmission member, the lumbar support assembly and the back connecting member in the backrest assembly are both rotatably connected to the seat module, the transmission rod is rotatably connected to the lumbar support assembly and the back connecting member, the seat module, the lumbar support assembly, the back connecting member and the transmission member constitute a four-bar mechanism, the backrest assembly in the backrest assembly is arranged on the back frame through a sliding rotation structure, the transmission rod is also rotatably connected to the back frame and the backrest assembly, forming a three-bar mechanism with a sliding rotation structure, and a lock is arranged on the sliding rotation structure. A fixing device is used to control the movement and locking of the three-bar mechanism; through the cooperation of the four-bar mechanism and the three-bar mechanism, switching between the normal sitting state, the first reclining state and the second reclining state is realized. In the first reclining state, the angle between the lumbar support assembly and the backrest assembly is minimum to adapt to the semi-reclining working posture. In the second reclining state, the angle between the lumbar support assembly and the backrest assembly is increased again to adapt to the lying resting posture, so as to adapt to more application scenarios, provide ergonomic support under different human body postures, and provide a more comfortable use experience in different scenarios.

[0006] The technical solution of the present invention is achieved in this way: A multi-state adjustable seat, comprising a lumbar support assembly, a backrest assembly and a seat module, wherein the seat module is configured to connect the supporting feet of the seat and to support the buttocks of a human body, the lumbar support assembly is configured to support the waist of a human body, and the backrest assembly is configured to support the back of a human body; the lumbar support assembly and the backrest assembly are rotatably connected to different positions of the seat module respectively; the backrest assembly comprises a back connector, a back frame and a backrest assembly, the back connector is rotatably connected to the seat module, and the backrest assembly is arranged on the back frame through a sliding and rotating structure; It also includes a transmission member, one end of which is rotatably connected to the lumbar support assembly and the backrest assembly, and the other end of the transmission member is rotatably connected to the back frame and the back connecting member; the sliding and rotating structure is connected to a locking device, and the locking device is configured to lock or unlock the sliding and rotation of the backrest assembly relative to the back frame; The seat has a normal sitting state, a first reclining state, and a second reclining state; in the normal sitting state, the backrest assembly and the lumbar support assembly are vertical, and the angle between the backrest assembly and the lumbar support assembly is the initial angle; in the first reclining state, the backrest assembly and the lumbar support assembly are both tilted backward relative to the seat module, and the angle between the backrest assembly and the lumbar support assembly is the first angle, and the first angle is smaller than the initial angle; in the second reclining state, the backrest assembly and the lumbar support assembly are both tilted backward relative to the seat module, and the angle between the backrest assembly and the lumbar support assembly is the second angle, and the second angle is larger than the first angle; When switching from a normal sitting state to a first reclining state, the locking device locks the relative movement of the backrest assembly and the back frame, and the rotation angles of the backrest assembly, the back frame and the transmission member are equal and smaller than the rotation angle of the lumbar support assembly; when switching from the first reclining state to the second reclining state, the locking device unlocks the relative movement of the backrest assembly and the back frame, and when the backrest assembly is subjected to force, the backrest assembly, the transmission member and the back frame are linked, and the backrest assembly is further rotated backward relative to the lumbar support assembly to increase the angle between the two.

[0007] When switching from the normal sitting state to the first reclining state, the rotation angle of the backrest assembly is not directly determined by the rotation angle of the back connecting member, but by the rotation angle of the transmission member. When the four-bar linkage composed of the lumbar support assembly, the seat module, the back connecting member and the transmission member is linked, the size and rotation angle of the lumbar support assembly and the back connecting member cause the rotation angle of the transmission member, and at this time the locking device fixes the backrest assembly and the back frame relatively, so that the rotation angle of the transmission member is directly the rotation angle of the back frame and the backrest assembly, and the rotation angle of the transmission member is much smaller than the rotation angle of the lumbar support assembly and the back connecting member, so that the angle between the backrest assembly and the lumbar support assembly becomes smaller, that is, the first angle is smaller than the initial angle, and the curved surface supporting the waist and back of the human body formed by the backrest assembly and the lumbar support assembly changes relative to the normal sitting state, forming that the backrest assembly still supports the back roughly forward, while the lumbar support assembly supports the waist of the human body toward the front and upper part. Such a supporting posture is just suitable for the human body posture when the user leans back to work, play with mobile phones or take a short rest.

[0008] In the second reclining state relative to the first reclining state, the backrest assembly is further reclined relative to the lumbar support assembly, so that the angle between the backrest assembly and the lumbar support assembly becomes larger again, that is, the second angle is greater than the first angle, so that the curved surface supporting the waist and back of the human body becomes gentle, and at this time it can adapt to the human body posture when the user lies on the seat for a long time to relax and rest, such as taking a lunch break.

[0009] When switching from a normal sitting state to a first reclining state, the locking device locks the backrest assembly, the transmission member and the back frame into a temporary whole, and the four-bar linkage formed by the lumbar support assembly, the transmission member, the back connecting member and the seat module reduces the included angle between the lumbar support assembly and the backrest assembly; when switching from the first reclining state to the second reclining state, the locking device unlocks the sliding and rotating structure, and the backrest assembly, the transmission member and the back frame form a linked three-bar linkage under the action of the sliding and rotating structure, and the four-bar linkage remains stable and stationary at this time, that is, the transmission member remains stationary, and when the backrest assembly is further forced to rotate backward, the three-bar linkage is linked, and the backrest assembly and the back frame both rotate backward, increasing the included angle between the backrest assembly and the lumbar support assembly.

[0010] Therefore, the seat is suitable for more application scenarios, can provide ergonomic support in different human postures, and can provide a more comfortable use experience in different scenarios.

[0011] Preferably, the sliding and rotating structure includes a slide groove and a sliding and rotating member, the slide groove is arranged on one of the back frame or the backrest assembly, the sliding and rotating member is arranged on the other of the back frame or the backrest assembly, the sliding and rotating member is arranged in the slide groove, and when the locking device is unlocked, the sliding and rotating member can slide in the slide groove and the backrest assembly can also rotate relative to the back frame; when switching from the first reclining state to the second reclining state, under the action of the sliding and rotating structure, the backrest assembly rotates backward and slides downward relative to the back frame, and the back frame rotates backward relative to the transmission member. The sliding and rotating member can both slide and rotate in the slide groove, and the three-link composed of the back frame, the backrest assembly and the back connecting member cannot generate relative movement, but the sliding and rotating structure provides a movement space, so that the three-link mechanism can move relatively, thereby realizing further movement of the backrest assembly in the second reclining state.

[0012] Preferably, the locking device is a gas rod, one end of which is rotatably connected to the back frame, and the other end of which is rotatably connected to the sliding rotating member. The gas rod is convenient and simple to set, and the locking device can also be a mechanical latch mechanism to achieve locking and unlocking.

[0013] Preferably, the backrest assembly includes a moving frame and a backrest frame, the backrest frame is configured to fit the back of a human body, and the backrest frame is fixedly connected to the moving frame; the moving frame is provided with the sliding rotating member extending left and right, the back frame is provided with the sliding groove in the shape of a long waist groove along its length direction, and the sliding rotating member is inserted in the sliding groove to connect the moving frame with the back frame. The sliding rotating member and the moving frame can be fixedly connected or rotatably connected, and when the sliding rotating member is fixedly connected to the moving frame, it must be slidably and rotatably connected with the sliding groove.

[0014] Preferably, the upper end of the transmission member is rotatably connected to the waist support assembly and the backrest assembly at the same position; the lower end of the transmission member is rotatably connected to the back frame and the back connecting member at the same position. While achieving the same movement effect, the structure is made more compact and unnecessary volume is reduced.

[0015] Preferably, the lumbar support assembly includes a lumbar connection member, a lumbar support frame and a rotating frame. The lumbar support frame is configured to fit the human waist. The lumbar support frame is fixedly connected to the rotating frame, and the rotating frame is rotatably connected to the lumbar connection member; the lumbar connection member is rotatably connected to the seat module and the transmission member. The lumbar support frame also has an adaptive rotation function, so that it can further rotate according to the human waist posture, provide more comfortable contact and support, and be more ergonomic.

[0016] Preferably, a damping pad is arranged between the waist connector and the rotating frame, and both the waist connector and the rotating frame abut against the damping pad. The damping pad increases the friction between the waist connector and the rotating frame, so that the waist support frame is maintained without being subjected to force, and will not always droop downward due to gravity.

[0017] Preferably, the seat module includes a chassis and a seat, the chassis is used to connect the support legs of the seat, and the seat is used to support the buttocks of the human body; an armrest seat extending upward is provided on the chassis, and the lumbar support assembly and the back connector are rotatably connected to the armrest seat.

[0018] Preferably, the seat is slidably arranged on the chassis, the lumbar support assembly is rotatably connected to the rear of the seat, and the rotation point of the lumbar support assembly and the seat is located below and behind the rotation point of the lumbar support assembly and the armrest seat. When switching from the normal sitting state to the first reclining state, the seat slides forward on the chassis. Since the rotation point of the lumbar support assembly and the seat is lower, when the lumbar support assembly rotates backward, its lower end rotates forward to push the seat forward; when the state is switched, the seat also moves together to adapt to the change of the buttocks moving forward when the human body lies down, and the use experience is more comfortable; when the human body falls backward, there is no need to move the position of the buttocks on the seat to achieve a more stretched and comfortable posture.

[0019] Preferably, the rotation point of the lumbar support assembly and the seat module is located above and in front of the rotation point of the back connector and the seat module, thereby realizing the arrangement and preset motion trajectory of the four-bar linkage.

[0020] The design starting point, concept and beneficial effects of the present invention using the above technical solution are: When switching from the normal sitting state to the first reclining state, the rotation angle of the backrest assembly is not directly determined by the rotation angle of the back connecting member, but by the rotation angle of the transmission member. When the four-bar linkage composed of the lumbar support assembly, the seat module, the back connecting member and the transmission member is linked, the size and rotation angle of the lumbar support assembly and the back connecting member cause the rotation angle of the transmission member, and at this time the locking device fixes the backrest assembly and the back frame relatively, so that the rotation angle of the transmission member is directly the rotation angle of the back frame and the backrest assembly, and the rotation angle of the transmission member is much smaller than the rotation angle of the lumbar support assembly and the back connecting member, so that the angle between the backrest assembly and the lumbar support assembly becomes smaller, that is, the first angle is smaller than the initial angle, and the curved surface supporting the waist and back of the human body formed by the backrest assembly and the lumbar support assembly changes relative to the normal sitting state, forming that the backrest assembly still supports the back roughly forward, while the lumbar support assembly supports the waist of the human body toward the front and upper part. Such a supporting posture is just suitable for the human body posture when the user leans back to work, play with mobile phones or take a short rest.

[0021] In the second reclining state relative to the first reclining state, the backrest assembly is further reclined relative to the lumbar support assembly, so that the angle between the backrest assembly and the lumbar support assembly becomes larger again, that is, the second angle is greater than the first angle, so that the curved surface supporting the waist and back of the human body becomes gentle, and at this time it can adapt to the human body posture when the user lies on the seat for a long time to relax and rest, such as taking a lunch break.

[0022] When switching from a normal sitting state to a first reclining state, the locking device locks the backrest assembly, the transmission member and the back frame into a temporary whole, and the four-bar linkage formed by the lumbar support assembly, the transmission member, the back connecting member and the seat module reduces the included angle between the lumbar support assembly and the backrest assembly; when switching from the first reclining state to the second reclining state, the locking device unlocks the sliding and rotating structure, and the backrest assembly, the transmission member and the back frame form a linked three-bar linkage under the action of the sliding and rotating structure, and the four-bar linkage remains stable and stationary at this time, that is, the transmission member remains stationary, and when the backrest assembly is further forced to rotate backward, the three-bar linkage is linked, and the backrest assembly and the back frame both rotate backward, increasing the included angle between the backrest assembly and the lumbar support assembly.

[0023] Therefore, the seat is suitable for more application scenarios, can provide ergonomic support in different human postures, and can provide a more comfortable use experience in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the three-dimensional structure of the seat in a normal sitting state in an embodiment of the present invention; Figure 2 is a schematic diagram of the three-dimensional structure of the seat in the first reclining state in an embodiment of the present invention; Figure 3 is a schematic diagram of the three-dimensional structure of the seat in the second reclining state in an embodiment of the present invention; Figure 4 is a side view of the seat in a normal sitting state in an embodiment of the present invention; Figure 5 is a side view of the seat in the first reclining state according to the embodiment of the present invention; Figure 6 is a side view of the seat in the second reclining state in an embodiment of the present invention; Figure 7 is a schematic diagram of the movement of the four-bar linkage when switching from the normal sitting state to the first reclining state in an embodiment of the present invention; Figure 8 for Figure 7 Schematic diagram of the angle change during the movement of the four-bar linkage; Fig. 9It is a schematic diagram of the movement of the three-link mechanism when switching from the first tilting state to the second tilting state in an embodiment of the present invention.

[0025] The figures are marked as follows: lumbar support assembly 1; lumbar connecting member 11; lumbar support frame 12; rotating frame 13; seat module 2; chassis 21; seat 22; armrest seat 23; back connecting member 3; back frame 4; backrest assembly 5; moving frame 51; backrest frame 52; transmission member 6; locking device 7; sliding and rotating structure 8; slide groove 81; sliding and rotating member 82; damping gasket 9. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0028] In the description of the present invention, the terms “first”, “second”, “third”, etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0029] The specific implementation methods of the present invention are as follows: like Figure 1-6 As shown, the present invention provides a multi-state adjustable seat, comprising a lumbar support assembly 1, a backrest assembly and a seat module 2, wherein the seat module 2 is configured to connect the supporting legs of the seat and to support the buttocks of a human body, the lumbar support assembly 1 is configured to support the waist of a human body, and the backrest assembly is configured to support the back of a human body; the lumbar support assembly 1 and the backrest assembly are rotatably connected to different positions of the seat module 2 respectively; the backrest assembly comprises a back connector 3, a back frame 4 and a backrest assembly 5, the back connector 3 is rotatably connected to the seat module 2, and the backrest assembly 5 is arranged on the back frame 4 through a sliding rotation structure 8; It also includes a transmission member 6, one end of which is rotatably connected to the lumbar support assembly 1 and the backrest assembly 5, and the other end of the transmission member 6 is rotatably connected to the back frame 4 and the back connecting member 3; the sliding and rotating structure 8 is connected to a locking device 7, and the locking device 7 is configured to lock or unlock the sliding and rotation of the backrest assembly 5 relative to the back frame 4; The seat has a normal sitting state, a first reclining state, and a second reclining state; in the normal sitting state, the backrest assembly 5 and the lumbar support assembly 1 are vertical, and the angle between the backrest assembly 5 and the lumbar support assembly 1 is the initial angle; in the first reclining state, the backrest assembly 5 and the lumbar support assembly 1 are both tilted backward relative to the seat module 2, and the angle between the backrest assembly 5 and the lumbar support assembly 1 is the first angle, and the first angle is smaller than the initial angle; in the second reclining state, the backrest assembly 5 and the lumbar support assembly 1 are both tilted backward relative to the seat module 2, and the angle between the backrest assembly 5 and the lumbar support assembly 1 is the second angle, and the second angle is larger than the first angle; When switching from a normal sitting state to a first reclining state, the locking device 7 locks the relative movement of the backrest assembly 5 and the back frame 4, and the rotation angles of the backrest assembly 5, the back frame 4 and the transmission member 6 are equal and smaller than the rotation angle of the lumbar support assembly 1; when switching from the first reclining state to the second reclining state, the locking device 7 unlocks the relative movement of the backrest assembly 5 and the back frame 4, and when the backrest assembly 5 is subjected to force, the backrest assembly 5, the transmission member 6 and the back frame 4 are linked, and the backrest assembly 5 is further rotated backward relative to the lumbar support assembly 1 to increase the angle between the two.

[0030] When switching from the normal sitting state to the first reclining state, the rotation angle of the backrest assembly 5 is not directly determined by the rotation angle of the back connector 3, but by the rotation angle of the transmission member 6. When the four-bar linkage composed of the lumbar support assembly 1, the seat module 2, the back connector 3 and the transmission member 6 is linked, the size and rotation angle of the lumbar support assembly 1 and the back connector 3 cause the rotation angle of the transmission member 6, and at this time, the locking device 7 fixes the backrest assembly 5 and the back frame 4 relatively, so that the rotation angle of the transmission member 6 is directly determined by the rotation angle of the back frame 4 and the backrest assembly 5. The rotation angle of the transmission member 6 is much smaller than the rotation angle of the lumbar support assembly 1 and the back connecting member 3, so that the angle between the backrest assembly 5 and the lumbar support assembly 1 becomes smaller, that is, the first angle is smaller than the initial angle, and the curved surface formed by the backrest assembly 5 and the lumbar support assembly 1 for supporting the waist and back of the human body changes relative to the normal sitting state, so that the backrest assembly 5 still roughly supports the back forward, while the lumbar support assembly 1 supports the human waist toward the front and upward. Such a supporting posture is just suitable for the human body posture when the user leans back to work, play with mobile phones or take a short rest.

[0031] In the second reclining state relative to the first reclining state, the backrest assembly 5 is further reclined relative to the lumbar support assembly 1, so that the angle between the backrest assembly 5 and the lumbar support assembly 1 becomes larger again, that is, the second angle is greater than the first angle, so that the curved surface supporting the waist and back of the human body becomes gentle, and at this time it can adapt to the human body posture when the user lies on the seat for a long time to relax and rest, such as taking a nap.

[0032] When switching from the normal sitting state to the first reclining state, under the locking device 7, the backrest assembly 5, the transmission member 6 and the back frame 4 are a temporary whole, and the angle between the lumbar support assembly 1 and the backrest assembly 5 is reduced under the action of the four-bar mechanism formed by the lumbar support assembly 1, the transmission member 6, the back connecting member 3 and the seat module 2; when switching from the first reclining state to the second reclining state, the locking device 7 unlocks the sliding and rotating structure 8, and the backrest assembly 5, the transmission member 6 and the back frame 4 form a linked three-bar mechanism under the action of the sliding and rotating structure 8. At this time, the four-bar mechanism remains stable and stationary, that is, the transmission member 6 remains stationary, and when the backrest assembly 5 is further forced to rotate backward, the three-bar mechanism is linked, and the backrest assembly 5 and the back frame 4 both rotate backward, increasing the angle between the backrest assembly 5 and the lumbar support assembly 1.

[0033] Therefore, the seat is suitable for more application scenarios, can provide ergonomic support in different human postures, and can provide a more comfortable use experience in different scenarios.

[0034] Specifically, in this embodiment, the chair seat module 2 includes a chassis 21 and a seat 22, the chassis 21 is used to connect the support legs of the seat, that is, it can be used to connect the gas springs used to lift the chair seat module 2; the seat 22 is used to support the buttocks of the human body; in addition, armrest seats 23 are fixedly provided at the left and right ends of the chassis 21, and the armrest seats 23 extend upward to exceed the seat 22, and the seat 22 is located between the two armrest seats 23; the lumbar support assembly 1 and the back connecting member 3 are both rotatably connected to the armrest seat 23, and the rotation connection point between the lumbar support assembly 1 and the armrest seat 23 is located above and in front of the rotation connection point between the back connecting member 3 and the armrest seat 23, which lays a good foundation for realizing the arrangement of the four-bar linkage and the preset motion trajectory.

[0035] In addition, the seat 22 is slidably arranged on the chassis 21, and the lumbar support assembly 1 is rotatably connected to the rear part of the seat 22, and in the normal sitting state, the rotation point of the lumbar support assembly 1 and the seat 22 is located at the rear and lower part of the rotation point of the lumbar support assembly 1 and the armrest seat 23. When switching from the normal sitting state to the first reclining state, the lumbar support assembly 1 rotates backward and drives the seat 22 to slide forward on the chassis 21; because the rotation point of the lumbar support assembly 1 and the seat 22 is lower, when the lumbar support assembly 1 rotates backward, its lower end rotates forward to push the seat 22 forward; when the state is switched, the seat 22 also moves together to adapt to the changes in the forward movement of the buttocks when the human body lies down, and the use experience is more comfortable; when the human body falls backward, there is no need to move the position of the buttocks on the seat 22, and a more stretched and comfortable posture can be achieved.

[0036] Furthermore, the lumbar support assembly 1 includes a lumbar connection member 11, a lumbar support frame 12 and a rotating frame 13. The lumbar support frame 12 is configured to fit the human waist. The lumbar support frame 12 is fixedly connected to the rotating frame 13, and the rotating frame 13 is rotatably connected to the lumbar connection member 11; the lumbar connection member 11 is rotatably connected to the armrest seat 23 and the transmission member 6, and the seat portion 22 is also rotatably connected to the lumbar connection member 11 and rotatably connected to the lower end of the lumbar connection member 11; the lumbar connection member 11 is a hollow frame structure, and the lumbar support frame 12 is rotatably set on the lumbar connection member 11 through the rotating frame 13 to have an adaptive rotation function, which can be relatively The waist connecting piece 11 rotates independently, so as to further rotate with the waist posture of the human body, provide more comfortable contact and support, and be more ergonomic; a damping gasket 9 is arranged between the waist connecting piece 11 and the rotating frame 13, and the rotating shaft between the waist connecting piece 11 and the rotating frame 13 is a long bolt, and the damping gasket 9 is sleeved on the long bolt. After tightening the long bolt, the waist connecting piece 11 and the rotating frame 13 are both in contact with the damping gasket 9, and the damping gasket 9 increases the friction between the waist connecting piece 11 and the rotating frame 13, so that the waist support frame 12 is maintained without being subjected to force, and will not always droop downward due to gravity.

[0037] The back connecting member 3 is also a hollow frame structure, and the back connecting member 3 is U-shaped, and its left and right ends are rotatably connected to the two armrest seats 23, and the middle part is rotatably connected to the transmission member 6; the transmission member 6 is a rectangular frame, and connection parts extend upward and downward at its left and right ends for rotational connection, and the upper end of the transmission member 6 is rotatably connected to the lumbar support assembly 1 and the backrest assembly 5 at the same position with a rotating shaft; the lower end of the transmission member 6 is rotatably connected to the back frame 4 and the back connecting member 3 at the same position with a rotating shaft, while achieving the same movement effect, making the structure more compact and reducing unnecessary volume.

[0038] like Figure 7 , 8 As shown, the above structural arrangement enables the back connector 3, the lumbar connector 11, the transmission member 6 and the armrest seat 23 to form the four-bar linkage. In this embodiment, the length ratio of the four-bar linkage is configured so that when switching from the normal sitting state to the first reclining state, the rotation angle of the lumbar connector 11 on the armrest seat 23 is 45°, the rotation angle of the back connector 3 on the armrest seat 23 is 48.3°, and the rotation angle of the transmission member 6 on the back connector 3 is 17.5°, that is, the lumbar support assembly 1 rotates backward by 45°, and the backrest assembly 5 only rotates backward by 17.5°, and the angle between the two is reduced by 27.5°, thereby forming a first angle with a smaller angle to accommodate semi-reclining reclining work or short rest.

[0039] Furthermore, if Figure 2 , 9As shown, the sliding and rotating structure 8 includes a slide groove 81 and a sliding and rotating member 82. The slide groove 81 is arranged on one of the back frame 4 or the backrest assembly 5, and the sliding and rotating member 82 is arranged on the other of the back frame 4 or the backrest assembly 5. The sliding and rotating member 82 is arranged in the slide groove 81, and when the locking device 7 is unlocked, the sliding and rotating member 82 can slide in the slide groove 81 and the backrest assembly 5 can also rotate relative to the back frame 4; when switching from the first reclining state to the second reclining state, under the action of the sliding and rotating structure 8, the backrest assembly 5 rotates backward and slides downward relative to the back frame 4, and the back frame 4 rotates backward relative to the transmission member 6; the sliding and rotating member 82 can both slide and rotate in the slide groove 81, and the three-link composed of the back frame 4, the backrest assembly 5 and the back connecting member 3 cannot generate relative movement, but the sliding and rotating structure 8 provides a movement space, so that the three-link mechanism can move relatively, thereby realizing further movement of the backrest assembly 5 in the second reclining state. The backrest assembly 5 includes a moving frame 51 and a backrest frame 52. The backrest frame 52 is configured to fit the back of a human body. The backrest frame 52 is fixedly connected to the moving frame 51. The lower part of the moving frame 51 is bent forward to be connected to the transmission member 6. The upper part of the moving frame 51 is also bent forward to avoid the back frame 4 when the first reclining state is switched to the second reclining state. The moving frame 51 is provided with the sliding rotating member 82 extending left and right. The sliding rotating member 82 is a rotating shaft. The back frame 4 is provided with the sliding groove 81 in the shape of a long waist groove along its length direction. The sliding rotating member 82 is inserted in the sliding groove 81 to connect the moving frame 51 with the back frame 4. The sliding rotating member 82 and the moving frame 51 can be either fixedly connected or rotatably connected. When the sliding rotating member 82 is fixedly connected to the moving frame 51, it must be slidably and rotatably connected to the sliding groove 81. In this embodiment, the moving frame 51 is rotatably connected to the sliding rotating member 82.

[0040] More specifically, the locking device 7 is a gas rod, one end of which is rotatably connected to the back frame 4, and the other end of the gas rod is rotatably connected to the sliding rotating member 82; the gas rod is relatively convenient and simple to set up, and the locking device 7 can also be a mechanical latch mechanism to achieve locking and unlocking.

Claims

1. A multi-state adjustable seat, characterized in that: The utility model comprises a lumbar support component, a backrest component and a seat module, wherein the seat module is configured to connect the supporting feet of the seat and to support the buttocks of a human body, the lumbar support component is configured to support the waist of a human body, and the backrest component is configured to support the back of a human body; the lumbar support component and the backrest component are rotatably connected to different positions of the seat module respectively; the backrest component comprises a back connector, a back frame and a backrest component, the back connector is rotatably connected to the seat module, and the backrest component is arranged on the back frame through a sliding and rotating structure; It also includes a transmission member, one end of which is rotatably connected to the lumbar support assembly and the backrest assembly, and the other end of the transmission member is rotatably connected to the back frame and the back connecting member; the sliding and rotating structure is connected to a locking device, and the locking device is configured to lock or unlock the sliding and rotation of the backrest assembly relative to the back frame; The seat has a normal sitting state, a first reclining state, and a second reclining state; in the normal sitting state, the backrest assembly and the lumbar support assembly are vertical, and the angle between the backrest assembly and the lumbar support assembly is the initial angle; in the first reclining state, the backrest assembly and the lumbar support assembly are both tilted backward relative to the seat module, and the angle between the backrest assembly and the lumbar support assembly is the first angle, and the first angle is smaller than the initial angle; in the second reclining state, the backrest assembly and the lumbar support assembly are both tilted backward relative to the seat module, and the angle between the backrest assembly and the lumbar support assembly is the second angle, and the second angle is larger than the first angle; When switching from the normal sitting state to the first reclining state, the locking device locks the relative movement of the backrest assembly and the back frame, and the rotation angles of the backrest assembly, the back frame and the transmission member are equal and smaller than the rotation angle of the lumbar support assembly; When switching from the first reclining state to the second reclining state, the locking device unlocks the relative movement of the backrest assembly and the back frame, and when the backrest assembly is subjected to force, the backrest assembly, the transmission member and the back frame are linked, and the backrest assembly further rotates backward relative to the lumbar support assembly to increase the angle between the two.

2. The multi-state adjustable seat according to claim 1, characterized in that: The sliding and rotating structure includes a slide groove and a sliding and rotating member. The slide groove is arranged on one of the back frame or the backrest assembly, and the sliding and rotating member is arranged on the other of the back frame or the backrest assembly. The sliding and rotating member is arranged in the slide groove, and when the locking device is unlocked, the sliding and rotating member can slide in the slide groove and the backrest assembly can also rotate relative to the back frame; when switching from the first reclining state to the second reclining state, under the action of the sliding and rotating structure, the backrest assembly rotates backward and slides downward relative to the back frame, and the back frame rotates backward relative to the transmission member.

3. The multi-state adjustable seat according to claim 2, characterized in that: The locking device is a gas rod, one end of which is rotatably connected to the back frame, and the other end of which is rotatably connected to the sliding rotating member.

4. The multi-state adjustable seat according to claim 2, characterized in that: The backrest assembly includes a moving frame and a backrest frame. The backrest frame is configured to fit the back of a human body, and the backrest frame is fixedly connected to the moving frame. The moving frame is provided with the sliding rotating parts extending left and right, and the back frame is provided with the sliding groove in the shape of a long waist-shaped groove along its length direction. The sliding rotating parts are inserted in the sliding groove to connect the moving frame with the back frame.

5. The multi-state adjustable seat according to claim 1, characterized in that: The upper end of the transmission member is rotatably connected with the waist support component and the backrest component at the same position; the lower end of the transmission member is rotatably connected with the back frame and the back connecting member at the same position.

6. The multi-state adjustable seat according to claim 1, characterized in that: The lumbar support assembly includes a lumbar connector, a lumbar support frame and a rotating frame. The lumbar support frame is configured to fit the human waist. The lumbar support frame is fixedly connected to the rotating frame, and the rotating frame is rotatably connected to the lumbar connector; the lumbar connector is rotatably connected to the seat module and the transmission member.

7. The multi-state adjustable seat according to claim 6, characterized in that: A damping gasket is arranged between the waist connecting piece and the rotating frame, and both the waist connecting piece and the rotating frame are in contact with the damping gasket.

8. The multi-state adjustable seat according to claim 1, characterized in that: The seat module includes a chassis and a seat, wherein the chassis is used to connect the supporting feet of the seat, and the seat is used to support the buttocks of a human body; an armrest seat extending upward is arranged on the chassis, and a lumbar support assembly and a back connector are both rotatably connected to the armrest seat.

9. The multi-state adjustable seat according to claim 8, characterized in that: The seat is slidably arranged on the chassis, the lumbar support assembly is rotatably connected to the rear of the seat, and the rotation point of the lumbar support assembly and the seat is located below and behind the rotation point of the lumbar support assembly and the armrest seat. When switching from a normal sitting state to a first reclining state, the seat slides forward on the chassis.

10. The multi-state adjustable seat according to claim 1, characterized in that: The pivot point of the lumbar support assembly and the seat module is located above and in front of the pivot point of the back connector and the seat module.

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