Adjustable seat

Abstract

The utility model provides an 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 both 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 piece form a four-bar 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 utility model relates to the field of furniture, especially a kind of adjusting seat. BACKGROUND

[0002] As one of the most common furniture, chair is more and more mature in the improvement of comfort, such as dividing the traditional chair back into waist rest and backrest, supporting the human back and waist in a targeted manner, so that the waist rest and backrest adapt to the different curves of the waist and back, making them more fit the waist and back, and providing more comfortable waist and back support.

[0003] However, this improvement is often only for the use scenario of normal sitting office, the user's upper body is vertically seated on the seat, and the waist rest is more prominent in supporting the human waist relative to the backrest; But in fact, there are many use scenarios of the seat, and the manufacturer has not considered comprehensively, and the existing seat has not been improved more perfectly; For example, the frequency of users sitting straight in office is less and less, but the situation of lying on the seat and working in a relatively relaxed posture is more and more, and the user will also entertain, play mobile phone, take a short rest and so on in this posture, since the existing seat can only support sitting office and lying rest, it is impossible to realize the support posture of half-lying, so the user will have empty waist in the posture of half-lying, and the waist is difficult to be effectively supported, and then the fatigue of waist is produced, and the fatigue will produce strain and injury with the accumulation of time.

[0004] For different use scenarios, the supporting surface formed by the backrest and the waist rest or the curve shape of the human waist and back should change to adapt to the different postures of the human body in different scenarios, especially to realize the switching of the states of sitting, half-lying and lying. SUMMARY

[0005] To solve the above technical problems, the utility model provides a kind of adjusting seat, including waist rest subassembly, chair back subassembly, chair seat module and transmission part, and the back connecting piece in waist rest subassembly and chair back subassembly are all rotationally connected with chair seat module, transmission rod is rotationally connected with waist rest subassembly, back connecting piece, chair seat module, waist rest subassembly, back connecting piece and transmission part constitute four-bar linkage mechanism, backrest subassembly in chair back subassembly is arranged on back frame by sliding rotation structure, transmission rod is also rotationally connected with back frame and backrest subassembly, constitute three-bar linkage mechanism with sliding rotation structure, and locking device is arranged on sliding rotation structure to control the movement and locking of three-bar linkage mechanism;By the cooperation of four-bar linkage mechanism and three-bar linkage mechanism, switching between normal sitting state, first reclining state and second reclining state is realized, in first reclining state, the included angle between waist rest subassembly and backrest subassembly is minimum to adapt to the posture of half lying rest, in second reclining state, the included angle between waist rest subassembly and backrest subassembly is increased again to adapt to the posture of lying rest, to adapt to more application scenarios, human engineering support can be provided in different human postures, and more comfortable use experience can be provided in different scenarios.

[0006] The technical scheme of the utility model is as follows:

[0007] A kind of adjusting seat, including waist rest subassembly, chair back subassembly and chair seat module, chair seat module is configured as the support leg of connecting seat and is used to support human hip, waist rest subassembly is configured as supporting human waist, and chair back subassembly is configured as supporting human back;Waist rest subassembly and chair back subassembly are rotationally connected at different positions of chair seat module respectively;Chair back subassembly includes back connecting piece, back frame and backrest subassembly, and back connecting piece is rotationally connected with chair seat module, and backrest subassembly is arranged on back frame by a sliding rotation structure;

[0008] Further including transmission part, one end of transmission part is rotationally connected with waist rest subassembly and backrest subassembly, and the other end of transmission part is rotationally connected with back frame and back connecting piece;Sliding rotation structure is connected with locking device, and locking device is configured to lock or unlock the sliding and rotation of backrest subassembly relative to back frame;

[0009] The seat has normal sitting state, first reclining state and second reclining state;In normal sitting state, backrest subassembly and waist rest subassembly are vertical, at this time, the included angle between backrest subassembly and waist rest subassembly is initial included angle;In first reclining state, backrest subassembly and waist rest subassembly are both inclined backward relative to chair seat module, at this time, the included angle between backrest subassembly and waist rest subassembly is first included angle, and first included angle is less than initial included angle;In second reclining state, backrest subassembly and waist rest subassembly are both inclined backward relative to chair seat module, at this time, the included angle between backrest subassembly and waist rest subassembly is second included angle, and second included angle is greater than first included angle;

[0010] 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, the rotation angles of the backrest assembly, the transmission member and the back frame are equal, and the rotation angle of the lumbar support assembly is smaller; 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 stressed, 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 included angle between the two.

[0011] 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 mechanism 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 relative to the back frame, 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 included angle between the backrest assembly and the lumbar support assembly becomes smaller, that is, the first included angle is smaller than the initial included angle, and the curved surface formed by the backrest assembly and the lumbar support assembly for supporting the waist and back of the human body changes relative to the normal sitting state, forming a posture in which the backrest assembly still roughly supports the back, and the lumbar support assembly supports the waist of the human body upward, which is exactly suitable for the human posture when the user works or plays a mobile phone or takes a short break backward.

[0012] And the second reclining state relative to the first reclining state, the backrest assembly is further inclined backward relative to the lumbar support assembly, so that the included angle between the backrest assembly and the lumbar support assembly is increased again, that is, the second included angle is greater than the first included angle, so that the curved surface for supporting the waist and back of the human body becomes flat, which can adapt to the human posture when the user lies on the seat for a long time, such as lunch break.

[0013] When switching from the normal sitting state to the first reclining state, under the locking of the locking device, the backrest assembly, the transmission member and the back frame form a temporary whole, and under the action of the four-bar linkage mechanism formed by the lumbar support assembly, the transmission member, the back connecting member and the seat module, the included angle between the lumbar support assembly and the backrest assembly is reduced; when switching from the first reclining state to the second reclining state, the locking device unlocks the sliding rotation structure, and the backrest assembly, the transmission member and the back frame form a linked three-bar linkage mechanism under the action of the sliding rotation structure, at this time the four-bar linkage mechanism remains stable and stationary, that is, the transmission member remains stationary, and when the backrest assembly is further stressed and rotated backward, the three-bar linkage mechanism is linked, and the backrest assembly and the back frame are both rotated backward to increase the included angle between the backrest assembly and the lumbar support assembly.

[0014] Therefore, the chair is suitable for more application scenarios, and can provide ergonomic support in different human postures and more comfortable use experience in different scenarios.

[0015] As preferred, the sliding and rotating structure comprises a sliding groove and a sliding and rotating piece, the sliding groove is arranged on one of the back frame or the backrest assembly, the sliding and rotating piece is arranged on the other of the back frame or the backrest assembly, the sliding and rotating piece is arranged in the sliding groove, and when the locking device is unlocked, the sliding and rotating piece can slide in the sliding groove and the backrest assembly can rotate relative to the back frame; when switching from the first reclining state to the second reclining state, the backrest assembly rotates backward and slides downward relative to the back frame under the action of the sliding and rotating structure, and the back frame rotates backward relative to the transmission piece. The sliding and rotating piece can slide and rotate in the sliding groove, the three-link mechanism composed of the back frame, the backrest assembly and the back connecting piece originally cannot produce relative motion, but the sliding and rotating structure provides a motion space, so that the three-link mechanism can produce relative motion, thereby realizing further movement of the backrest assembly in the second reclining state.

[0016] As preferred, the locking device is a gas rod, one end of the gas rod is rotatably connected to the back frame, and the other end of the gas rod is rotatably connected to the sliding and rotating piece. The gas rod is convenient and simple to arrange, and the locking device can also be a mechanical bolt mechanism to achieve locking and unlocking.

[0017] As preferred, the backrest assembly comprises a moving frame and a backrest frame, the backrest frame is configured to fit the human back, and the backrest frame is fixedly connected to the moving frame; the moving frame is provided with the sliding and rotating piece arranged in extension left and right, and the back frame is provided with the long-narrow slot-shaped sliding groove arranged in the length direction of the back frame, and the sliding and rotating piece is inserted into the sliding groove to connect the moving frame and the back frame. The sliding and rotating piece and the moving frame can be fixedly connected or rotatably connected, and when the sliding and rotating piece and the moving frame are fixedly connected, the sliding and rotating piece must be rotatably connected to the sliding groove.

[0018] As preferred, the upper end of the transmission piece is rotatably connected to the lumbar support assembly and the backrest assembly at the same position; and the lower end of the transmission piece is rotatably connected to the back frame and the back connecting piece at the same position. In the case of achieving the same motion effect, the structure is more compact, and unnecessary size is reduced.

[0019] As preferred, the lumbar support assembly comprises a lumbar connecting piece, 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 connecting piece; the lumbar connecting piece is rotatably connected to the seat module and the transmission piece. The lumbar support frame also has an adaptive rotating function, so as to further rotate following the human waist posture, provide more comfortable leaning and supporting, and be more ergonomic.

[0020] Preferably, a damping pad is arranged between the waist connecting piece and the rotating frame, and the waist connecting piece and the rotating frame abut against the damping pad.

[0021] Preferably, the seat module comprises a chassis for connecting supporting legs of the seat and a seat portion for supporting a human buttock, and an upwardly extending armrest seat is arranged on the chassis, and the waist rest assembly and the back connecting piece are both rotatably connected to the armrest seat.

[0022] Preferably, the seat portion is slidingly arranged on the chassis, the waist rest assembly is rotatably connected to the rear portion of the seat portion, and the rotation point of the waist rest assembly and the seat portion is located below and rearward of the rotation point of the waist rest assembly and the armrest seat, and when switching from the normal sitting state to the first reclining state, the seat portion slides forward on the chassis.

[0023] Preferably, the rotation point of the waist rest assembly and the seat module is located above and forward of the rotation point of the back connecting piece and the seat module, so as to realize the arrangement of the four-bar linkage mechanism and the preset motion track.

[0024] The design starting point, concept and beneficial effects of the utility model are as follows:

[0025] 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 piece, but is determined by the rotation angle of the transmission member, and when the four-bar linkage mechanism composed of the waist rest assembly, the seat module, the back connecting piece and the transmission member is linked, the rotation angle of the transmission member is caused by the size and rotation angle of the waist rest assembly and the back connecting piece, and at this time, the locking device relatively fixes the backrest assembly and the back frame, 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 waist rest assembly and the back connecting piece, so that the included angle between the backrest assembly and the waist rest assembly becomes smaller, that is, the first included angle is smaller than the initial included angle, and the curved surface formed by the backrest assembly and the waist rest assembly for supporting the human back and waist changes relative to the normal sitting state, so that the backrest assembly still supports the back forward, and the waist rest assembly supports the human waist toward the front upper side, and such a supporting posture is just suitable for the human posture when the user reclines backward to work or play a mobile phone or take a short rest.

[0026] And the second reclining state relative to the first reclining state, the backrest assembly relative to the lumbar support assembly is further inclined backward, so that the angle between the backrest assembly and the lumbar support assembly is also re-increased, 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 flat, at this time, it can also adapt to the human body posture when the user lies on the seat for long time relaxation, such as lunch break.

[0027] When switching from the normal sitting state to the first reclining state, the backrest assembly, the transmission member and the back frame are temporarily integrated under the locking of the locking device, and under the action of the four-bar linkage mechanism formed by the lumbar support assembly, the transmission member, the back connecting member and the seat module, the angle between the lumbar support assembly and the backrest assembly is reduced; when switching from the first reclining state to the second reclining state, the locking device unlocks the sliding rotating structure, the backrest assembly, the transmission member and the back frame form a linked three-bar linkage mechanism under the action of the sliding rotating structure, at this time, the four-bar linkage mechanism remains stable and stationary, that is, the transmission member remains stationary, and when the backrest assembly is further rotated backward under force, the three-bar linkage mechanism produces linkage, the backrest assembly and the back frame are both rotated backward, increasing the angle between the backrest assembly and the lumbar support assembly.

[0028] Therefore, the seat can adapt to more application scenarios and provide ergonomic support in different human postures and more comfortable use experience in different scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a three-dimensional structure schematic diagram of the seat in the normal sitting state in the embodiment of the utility model;

[0030] Figure 2 It is a three-dimensional structure schematic diagram of the seat in the first reclining state in the embodiment of the utility model;

[0031] Figure 3 It is a three-dimensional structure schematic diagram of the seat in the second reclining state in the embodiment of the utility model;

[0032] Figure 4 It is a side view of the seat in the normal sitting state in the embodiment of the utility model;

[0033] Figure 5 It is a side view of the seat in the first reclining state in the embodiment of the utility model;

[0034] Figure 6 It is a side view of the seat in the second reclining state in the embodiment of the utility model;

[0035] Figure 7 It is a schematic diagram of the four-bar linkage mechanism motion when switching from the normal sitting state to the first reclining state in the embodiment of the utility model;

[0036] Figure 8 As Figure 7 Fig. 2 is a schematic view of the angle change of the four-bar linkage mechanism during movement;

[0037] Figure 9 Fig. 3 is a schematic view of the movement of the three-bar linkage mechanism when the utility model switches from the first reclining state to the second reclining state in the embodiment.

[0038] The reference signs are as follows: a lumbar support assembly 1; a lumbar connecting piece 11; a lumbar support frame 12; a rotating frame 13; a seat module 2; a chassis 21; a seat portion 22; an armrest seat 23; a back connecting piece 3; a back frame 4; a backrest assembly 5; a moving frame 51; a backrest frame 52; a transmission piece 6; a locking device 7; a sliding rotating structure 8; a sliding slot 81; a sliding rotating piece 82; a damping gasket 9. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model will be further described in detail below in combination with the 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.

[0040] In the following description, many specific details are set forth in order to provide a thorough understanding of the utility model, but the utility model can also be implemented in other ways different from those described herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0041] In the description of the utility model, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0042] The specific embodiments of the utility model are as follows:

[0043] As Figures 1-6 shown, the utility model provides a kind of adjusting seat, including lumbar support assembly 1, chair back assembly and seat module 2, seat module 2 is configured as the supporting leg of connecting seat and is used to support human hip, lumbar support assembly 1 is configured as supporting human waist, and chair back assembly is configured as supporting human back;Lumbar support assembly 1 and chair back assembly are respectively rotationally connected at different positions of seat module 2;Chair back assembly includes back connecting piece 3, back frame 4 and backrest assembly 5, back connecting piece 3 is rotationally connected with seat module 2, and backrest assembly 5 is arranged on back frame 4 by a sliding rotating structure 8;

[0044] Further comprising a transmission member 6, one end of the transmission member 6 is rotatably connected with the waist rest assembly 1 and the backrest assembly 5, and the other end of the transmission member 6 is rotatably connected with the back frame 4 and the back connecting member 3; the sliding rotation structure 8 is connected with 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;

[0045] The chair 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 waist rest assembly 1 are vertical, and the included angle between the backrest assembly 5 and the waist rest assembly 1 is an initial included angle at this time; in the first reclining state, the backrest assembly 5 and the waist rest assembly 1 are both inclined backward relative to the seat module 2, and the included angle between the backrest assembly 5 and the waist rest assembly 1 is a first included angle at this time, and the first included angle is smaller than the initial included angle; in the second reclining state, the backrest assembly 5 and the waist rest assembly 1 are both inclined backward relative to the seat module 2, and the included angle between the backrest assembly 5 and the waist rest assembly 1 is a second included angle at this time, and the second included angle is greater than the first included angle.

[0046] When switching from the normal sitting state to the first reclining state, the locking device 7 locks the relative movement of the backrest assembly 5 and the back frame 4, the rotation angles of the backrest assembly 5, the back frame 4 and the transmission member 6 are equal, and are smaller than the rotation angle of the waist rest 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 stressed, 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 waist rest assembly 1 to increase the included angle between the backrest assembly 5 and the waist rest assembly 1.

[0047] 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 connecting member 3, but is determined by the rotation angle of the transmission member 6; when the four-bar linkage mechanism composed of the waist rest assembly 1, the seat module 2, the back connecting member 3 and the transmission member 6 is linked, the sizes and rotation angles of the waist rest assembly 1 and the back connecting member 3 cause the rotation angle of the transmission member 6, and at this time the locking device 7 relatively fixes the backrest assembly 5 and the back frame 4, so that the rotation angle of the transmission member 6 is directly the rotation angle of the back frame 4 and the backrest assembly 5, and the rotation angle of the transmission member 6 is much smaller than the rotation angles of the waist rest assembly 1 and the back connecting member 3, so that the included angle between the backrest assembly 5 and the waist rest assembly 1 becomes smaller, i.e. the first included angle is smaller than the initial included angle, the curved surface formed by the backrest assembly 5 and the waist rest assembly 1 for supporting the waist and back of the human body changes relative to the normal sitting state, and the backrest assembly 5 still generally supports the back, while the waist rest assembly 1 supports the waist of the human body upward and forward, and such a supporting posture is just suitable for the human posture when the user works or plays a mobile phone or takes a short break backwardly.

[0048] In the second reclining state, the backrest assembly 5 is further reclined relative to the lumbar support assembly 1 than in the first reclining state, so that the included angle between the backrest assembly 5 and the lumbar support assembly 1 is increased again, i.e. the second included angle is greater than the first included angle, so that the curved surface supporting the waist and back of the human body becomes flat, which can adapt to the human posture when the user lies on the seat for long-term relaxation, such as lunch break.

[0049] When switching from the normal sitting state to the first reclining state, the backrest assembly 5, the transmission member 6 and the backrest 4 are temporarily integrated under the locking of the locking device 7, and under the action of the four-bar linkage mechanism formed by the lumbar support assembly 1, the transmission member 6, the back connecting member 3 and the seat module 2, the included angle between the lumbar support assembly 1 and the backrest assembly 5 is reduced; when switching from the first reclining state to the second reclining state, the locking device 7 unlocks the sliding rotating structure 8, and the backrest assembly 5, the transmission member 6 and the backrest 4 form a linked three-bar linkage mechanism under the action of the sliding rotating structure 8, at this time the four-bar linkage mechanism remains stable and stationary, i.e. the transmission member 6 remains stationary, and when the backrest assembly 5 is further forced to rotate backward, the three-bar linkage mechanism is linked, and the backrest assembly 5 and the backrest 4 are both rotated backward, increasing the included angle between the backrest assembly 5 and the lumbar support assembly 1.

[0050] Therefore, the seat can adapt to more application scenarios and provide ergonomic support in different human postures and more comfortable use experience in different scenarios.

[0051] Specifically, in the embodiment, the seat module 2 includes a base plate 21 and a seat portion 22, the base plate 21 is used to connect the supporting legs of the seat, i.e. can be used to connect the gas springs for lifting the seat module 2; the seat portion 22 is used to support the hips of the human body; in addition, the left and right ends of the base plate 21 are each fixedly provided with an armrest seat 23, the armrest seat 23 extends upward to exceed the seat portion 22, and the seat portion 22 is located between the two armrest seats 23; the lumbar support assembly 1 and the back connecting member 3 are both rotationally connected to the armrest seat 23, and the rotation connecting point between the lumbar support assembly 1 and the armrest seat 23 is located above and forward of the rotation connecting point between the back connecting member 3 and the armrest seat 23, which lays a foundation for the arrangement of the four-bar linkage mechanism and the preset motion trajectory.

[0052] Further, the seat part 22 is slidingly arranged on the chassis 21, the lumbar support assembly 1 is rotationally connected with the rear part of the seat part 22, and in the normal sitting state, the rotation point of the lumbar support assembly 1 and the seat part 22 is located below and rearward of the rotation point of the armrest seat 23, when switching from the normal sitting state to the first reclining state, the lumbar support assembly 1 rotates rearward while driving the seat part 22 to slide forward on the chassis 21; due to the lower rotation point of the lumbar support assembly 1 and the seat part 22, when the lumbar support assembly 1 rotates rearward, the lower end thereof rotates forward to push the seat part 22 to move forward; when switching the states, the seat part 22 also links together, which is suitable for the change of the forward movement of the hips when lying down, and the use feels more comfortable; when the human body is in the rearward leaning state, the hips do not need to be moved on the seat part 22 to achieve a more comfortable posture.

[0053] Further, the lumbar support assembly 1 comprises a lumbar connecting piece 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 with the rotating frame 13, and the rotating frame 13 is rotationally connected with the lumbar connecting piece 11; the lumbar connecting piece 11 is rotationally connected with the armrest seat 23 and the transmission piece 6, and the seat part 22 is also rotationally connected with the lower end of the lumbar connecting piece 11; the lumbar connecting piece 11 is a hollow frame structure, the lumbar support frame 12 is rotationally arranged on the lumbar connecting piece 11 through the rotating frame 13 to have a self-adaptive rotation function, and can independently rotate relative to the lumbar connecting piece 11, so as to further follow the posture of the human waist to rotate, and provide more comfortable fitting and support, and be more in line with ergonomics; a damping washer 9 is arranged between the lumbar connecting piece 11 and the rotating frame 13, a long bolt is arranged between the lumbar connecting piece 11 and the rotating frame 13, and the damping washer 9 is sleeved on the long bolt; after the long bolt is tightened, the lumbar connecting piece 11 and the rotating frame 13 are both in abutment with the damping washer 9, the damping washer 9 increases the friction between the lumbar connecting piece 11 and the rotating frame 13, so that the lumbar support frame 12 is kept without force, and will not always sag downward due to gravity.

[0054] The back connecting piece 3 is also a hollow frame structure, and the back connecting piece 3 is in a U shape, the left and right ends thereof are rotationally connected with the two armrest seats 23, and the middle part thereof is rotationally connected with the transmission piece 6; the transmission piece 6 is a rectangular frame, and a connecting part is upwardly and downwardly extended at the left and right ends thereof to be rotationally connected, and the upper end of the transmission piece 6 is rotationally connected with the lumbar support assembly 1 and the backrest assembly 5 at the same position by a rotation shaft; the lower end of the transmission piece 6 is rotationally connected with the back frame 4 and the back connecting piece 3 at the same position by a rotation shaft, which makes the structure more compact and reduces unnecessary size under the condition of achieving the same movement effect.

[0055] As Figure 7 , 8As shown, the structure is arranged so that the back connecting member 3, the waist connecting member 11, the transmission member 6 and the armrest seat 23 form the four-bar linkage mechanism, in the embodiment, the length proportion of the four-bar linkage is arranged so that when switching from the normal sitting state to the first reclining state, the rotation angle of the waist connecting member 11 on the armrest seat 23 is 45°, the rotation angle of the back connecting member 3 on the armrest seat 23 is 48.3°, and the rotation angle of the transmission member 6 on the back connecting member 3 is 17.5°, that is, the waist rest assembly 1 rotates 45° backward, and the back rest assembly 5 only rotates 17.5° backward, and the included angle between the two is reduced by 27.5°, so as to form a first included angle with a smaller angle, so as to adapt to the reclining work or short rest in a half-lying position.

[0056] Further, as shown in Figure 2 、 9 The sliding and rotating structure 8 includes a sliding groove 81 and a sliding and rotating member 82, the sliding groove 81 is arranged on one of the back frame 4 or the back rest assembly 5, the sliding and rotating member 82 is arranged on the other one of the back frame 4 or the back rest assembly 5, the sliding and rotating member 82 is arranged in the sliding groove 81, and when the locking device 7 is unlocked, the sliding and rotating member 82 can slide in the sliding groove 81 and the back rest assembly 5 can also rotate relative to the back frame 4; when switching from the first reclining state to the second reclining state, the back rest assembly 5 rotates backward and slides downward relative to the back frame 4 under the action of the sliding and rotating structure 8, and the back frame 4 rotates backward relative to the transmission member 6; the sliding and rotating member 82 can slide and rotate in the sliding groove 81, the three-bar linkage composed of the back frame 4, the back rest assembly 5 and the back connecting member 3 originally cannot produce relative motion, but the sliding and rotating structure 8 provides a motion space, so that the three-bar linkage mechanism can move relatively, thereby realizing the further movement of the back rest assembly 5 in the second reclining state. The back rest assembly 5 includes a moving frame 51 and a back rest frame 52, the back rest frame 52 is arranged to fit the human back, the back rest frame 52 is fixedly connected with the moving frame 51, the lower part of the moving frame 51 is bent forward to be connected with the transmission member 6, and the upper part of the moving frame 51 is also bent forward to avoid the back frame 4 when switching from the first reclining state to the second reclining state; the moving frame 51 is provided with the left and right extending sliding and rotating members 82, the sliding and rotating member 82 is a rotating shaft, the back frame 4 is provided with the long-narrow slot-shaped sliding groove 81 along the length direction, the sliding and rotating member 82 is inserted into the sliding groove 81 to connect the moving frame 51 with the back frame 4; the sliding and rotating member 82 and the moving frame 51 can be fixedly connected or rotationally connected, when the sliding and rotating member 82 is fixedly connected with the moving frame 51, it must be rotationally connected with the sliding groove 81, in the embodiment, the moving frame 51 is rotationally connected with the sliding and rotating member 82.

[0057] More specifically, the locking device 7 is an air cylinder, one end of which is rotatably connected to the back frame 4, and the other end of which is rotatably connected to the sliding rotating member 82; the air cylinder is relatively convenient and simple to set up, and the locking device 7 can also be a mechanical bolt mechanism, so as to achieve locking and unlocking.

Claims

1. An adjustable seat, characterized in that: The chair includes a lumbar support assembly, a backrest assembly, and a seat module. The seat module is configured to connect to the support legs of the seat and support the buttocks of the human body. The lumbar support assembly is configured to support the lower back of the human body, and the backrest assembly is configured to support the back of the human body. The lumbar support assembly and the backrest assembly are rotatably connected to different positions on the seat module. The backrest assembly includes 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 mounted on the back frame through a sliding and rotating structure. It also includes a transmission component, one end of which is rotatably connected to the lumbar support assembly and the backrest assembly, and the other end of which is rotatably connected to the back frame and the back connector; the sliding rotation structure is connected to a locking device, which 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 position, a first tilt position, and a second tilt position. In the normal sitting position, 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 tilt position, both the backrest assembly and the lumbar support assembly are tilted backward relative to the seat module, and the angle between the backrest assembly and the lumbar support assembly is the first angle, which is smaller than the initial angle. In the second tilt position, both the backrest assembly and the lumbar support assembly are tilted backward relative to the seat module, and the angle between the backrest assembly and the lumbar support assembly is the second angle, which is larger than the first angle. When switching from the normal sitting position to the first reclining position, the locking device locks the relative movement of the backrest assembly and the back frame. The rotation angles of the backrest assembly, the back frame, and the transmission components are equal and less than the rotation angle of the lumbar support assembly. When switching from the first tilt state to the second tilt state, the locking device unlocks the relative movement between the backrest assembly and the back frame. When the backrest assembly is under force, the backrest assembly, the transmission component, and the back frame are linked together, and the backrest assembly rotates further backward relative to the lumbar support assembly to increase the included angle between the two.

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

3. The adjustable seat according to claim 2, characterized in that: The locking device is a pneumatic rod, with one end of the pneumatic rod rotatably connected to the back frame and the other end of the pneumatic rod rotatably connected to the sliding rotating part.

4. The adjustable seat according to claim 2, characterized in that: The backrest assembly includes a motion frame and a backrest frame. The backrest frame is configured to fit the back of the human body and is fixedly connected to the motion frame. The motion frame is provided with the sliding rotating component that extends to the left and right. The backrest frame has a groove in the shape of an elongated slot along its length. The sliding rotating component is inserted into the groove to connect the motion frame and the backrest frame.

5. The adjustable seat according to claim 1, characterized in that: The upper end of the transmission component is rotatably connected to the lumbar support assembly and the backrest assembly at the same position; the lower end of the transmission component is rotatably connected to the back frame and the back connector at the same position.

6. The 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 chair seat module and the transmission component.

7. The adjustable seat according to claim 6, characterized in that: A damping pad is installed between the waist connector and the rotating frame, and both the waist connector and the rotating frame abut against the damping pad.

8. The adjustable seat according to claim 1, characterized in that: The chair module includes a chassis and a seat. The chassis is used to connect the support legs of the chair, and the seat is used to support the buttocks of the human body. The chassis is provided with an upwardly extending armrest seat, and the lumbar support assembly and backrest connector are rotatably connected to the armrest seat.

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

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

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