Chair back assembly for lifting waist support

Abstract

The utility model provides a chair back component for lifting waist support, which comprises a back support, a moving device arranged on the back support, a waist rest arranged on the moving device and two armrest frames arranged on two sides of the moving device in a manner of rotating around a vertical axis, and the waist rest is positioned between the two armrest frames and is respectively close to the two armrest frames; the moving device enables the two armrest frames to move at the same time and enables the two armrest frames to be kept at the current position; when the ends, away from the exercise device, of the two armrest frames get close to each other, the two armrest frames drive the two ends of the waist rest to get close to each other, the waist rest forms different surrounding states, and therefore the waist of the human body is more effectively supported and wrapped, comfort is improved, the sitting posture is corrected, the effect that people do not feel tired when sitting is achieved, and the health hidden danger of the lumbar vertebra is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a chair back assembly for improving waist support. Background Art

[0002] Chairs are office furniture for people to sit on when working and studying. Office workers will feel tired after sitting for a long time, and may even suffer from lumbar health problems due to sitting. Traditional chairs generally have a seat for the human body to sit on. When the human body sits on the seat, the body weight is supported by the seat. According to the physiological structure of the human body, the human spine carries the upper body such as the head and back. Since the lumbar spine is at the lowest position of the spine, the load is quite large, and it is also the junction of the movable segment and the fixed segment, it is more susceptible to injury. In addition, if the human sitting posture is incorrect, in addition to looking listless, it is more likely to cause back pain, and even affect the spine, compress nerves, and ultimately affect physical health.

[0003] However, many chairs with lumbar supports on the market can only provide a small amount of support for the human waist, and have no function of correcting sitting posture. The above problems have not been effectively solved. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the utility model provides a chair back assembly for enhancing lumbar support, comprising a back support, a motion device arranged on the back support, a lumbar support arranged on the motion device, and two armrest frames arranged on both sides of the motion device and rotating around a vertical axis, the lumbar support being located between the two armrest frames and close to the two armrest frames respectively; the motion device causes the two armrest frames to move simultaneously and keeps the two armrest frames at the current position; when the two armrest frames approach each other at one end away from the motion device, the two armrest frames drive the two end portions of the lumbar support to approach each other, allowing the lumbar support to form different embracing states, thereby more effectively supporting and wrapping the human waist, improving comfort, and correcting sitting posture, achieving the effect of sitting without getting tired, and effectively avoiding health hazards of the lumbar spine.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A chair back assembly for improving lumbar support comprises a back support, a movement device, a lumbar support and two armrest frames arranged on both sides of the movement device, the lumbar support is installed on the movement device, the movement device is installed on the back support, and the two armrest frames are rotatably arranged on the movement device around a vertical axis; the lumbar support is located between the two armrest frames, the lumbar support and the two armrest frames are abutted and slidably matched, and the movement device is configured to link the armrest frames on both sides to rotate, so that the two armrest frames open and close synchronously, and the two armrest frames are maintained at the current rotation position; when the two armrest frames rotate in the closing direction, the lumbar support and the armrest frames slide relative to each other, and the armrest frames drive the two ends of the lumbar support to approach each other; when the two armrest frames open and rotate, the lumbar support and the armrest frames slide relative to each other, and the armrest frames drive the two ends of the lumbar support to move away from each other and open.

[0007] When a human body leans on the chair back assembly, the chair back assembly can, on the one hand, provide variable support and a wrapping feeling for the waist, so that the waist support can more effectively support the human waist and improve comfort; on the other hand, it can correct the sitting posture, enhance the supporting effect of the waist support on the human lumbar spine, reduce the pressure on the waist and spine, and sit for a long time without getting tired; under the action of the motion device, the two armrests rotate at the same time, and when the two armrests away from the end of the motion device approach each other, the two ends of the waist support are driven to approach each other to clamp the human waist, and the operation is very simple and convenient, which is conducive to the user's adjustment; because the two armrests are linked and the rotation angles are the same, the two ends of the waist support are symmetrically gathered, so that the waist support can clamp the waist more correctly and vertically, and the waist protection effect is strong.

[0008] Preferably, the waist support is elastic. When the ends of the two armrests away from the movement device approach each other and rotate in the closing direction, the armrests drive the waist support to produce elastic deformation, and the two ends of the waist support approach each other to clamp the human waist; when the ends of the two armrests away from the movement device move away from each other and open and rotate, the waist support restores the elastic deformation. There are many ways to achieve the opening and closing movement of the waist support, such as hingedly connecting the two side wings of the waist support to the middle of the waist support. In this solution, the opening and closing of the waist support is achieved directly through the elasticity of the waist support, which has a simple structure and lower cost.

[0009] Preferably, the motion device comprises a base, which is arranged on the back support, and a linkage mechanism is arranged on the base, and the two armrests are provided with a linkage part, which is transmission-connected with the linkage mechanism; the linkage part and the linkage mechanism are configured to drive the two armrests to rotate simultaneously. The linkage part on the armrest cooperates with the linkage mechanism in the motion device to realize the synchronous opening and closing linkage of the armrests on both sides.

[0010] Preferably, the linkage mechanism includes two gears, which are meshed and arranged transversely in the base; the linkage part includes a plurality of meshing teeth located at one end of the two handrails and separated from the rotating part, and the meshing teeth on the two handrails are respectively meshed with the two gears. Through the plurality of gears, while realizing the linkage of the two handrails, the handrail on one side can rotate counterclockwise and the handrail on the other side can rotate clockwise, thereby realizing the opening and closing movement of the two handrails; and the gears are smaller in size, making the structure more compact.

[0011] Preferably, the linkage mechanism is a four-bar linkage, and the linkage part is a connecting rod.

[0012] Preferably, the base is further provided with a locking mechanism, and the armrest has a gear portion, which cooperates with the locking mechanism; the gear portion and the locking mechanism are configured to keep the two armrests in the position after rotation. The gear portion and the locking mechanism allow the armrest to rotate with multiple gears, so that the armrest can stay in the current position after rotation.

[0013] Preferably, the two handrails are opened and closed by a motion device; the gear part includes a plurality of ratchets; the locking mechanism includes two sliders symmetrically arranged on the base and a spring arranged between the two sliders, the two sliders are slidably arranged on the base, the sliders include locking teeth meshed with the ratchets, and the ratchets and the locking teeth are one-way self-locking; when the two handrails are closed and rotated, the locking teeth are meshed with different ratchets; when the two handrails have a tendency to open and rotate, the ratchets and the locking teeth are self-locking. The one-way self-locking of the ratchets and the locking teeth can achieve the effect of keeping the handrails in the current position after rotation, thereby realizing the function of the gear; the spring allows the two sliders to slide and reset, and when the handrails are closed and rotated, the two sliders slide close to each other, allowing the locking teeth to switch between different ratchets; it is also possible to have multiple locking teeth, thereby increasing the stability when the locking teeth are meshed with the ratchets.

[0014] Preferably, the handrail frame is provided with a coaxially rotating self-circulating part, the self-circulating part is provided with an arc-shaped waist hole, and the handrail frame is provided with a convex shaft inserted in the arc-shaped waist hole. When the handrail frame rotates, the convex shaft moves in the arc-shaped waist hole; the arc-shaped waist hole has a front end and a rear end, and the self-circulating part is configured so that when the two handrail frames are fully opened, the convex shaft is located at the front end of the arc-shaped waist hole, and when the two handrail frames are closed, the convex shaft moves from the front end to the rear end of the arc-shaped waist hole; after the convex shaft abuts against the rear end of the arc-shaped waist hole, the two handrail frames continue to close, and the convex shaft drives the self-circulating part to rotate, and the two self-circulating parts push the two sliders closer to each other and disengage the ratchet and the locking teeth, so that the two handrails can be opened and reset. The self-circulating part is driven by the rotation of the handrail frame. When the handrail frame is closed and rotated to the final gear, the convex shaft is located at the rear end of the arc-shaped waist hole. The handrail frame continues to be closed and rotated, and the convex shaft of the handrail frame can drive the self-circulating part to rotate and allow the self-circulating part to resist the slider, so that the locking teeth and ratchet teeth on the slider are always kept disengaged. At this time, the handrail frame can be opened and rotated. After the convex shaft returns to the front end of the arc-shaped waist hole and continues to rotate, the slider can be unlocked. The slider is reset under the action of the spring, so that the locking teeth and ratchet teeth engage again.

[0015] Preferably, the self-circulating member is provided with an anti-slip boss, which is configured to abut against the slider after the two self-circulating members push the two sliders closer to each other, so as to prevent the self-circulating member from disengaging from the slider during the return process of the handrail frame and causing the ratchet and the locking tooth to mesh. After the self-circulating member pushes the slider, the anti-slip boss abuts against the side of the slider. The purpose of the anti-slip boss is to prevent the self-circulating member from rotating prematurely and unlocking the slider, thereby ensuring that the self-circulating member and the slider can be unlocked and the locking tooth can be re-engaged with the ratchet after the handrail frame is opened, rotated and completely reset.

[0016] Preferably, the linkage mechanism and the locking mechanism are arranged at intervals on the base, and the linkage part and the shift part are arranged at intervals on the armrest. Such an arrangement can make the overall structure simpler and more compact.

[0017] Preferably, the handrail frame includes a main body and a functional part, the main body is fixedly connected to the functional part, the functional part is rotatably connected to the base, and the linkage part and the shift part are both arranged on the functional part. Directly arranging the linkage part and the shift part on the main body of the handrail frame will make the overall structure of the main body very complicated, and the mold opening and production costs are too high. After the handrail frame is divided into the main body and the functional part, the structure of the main body is simple, and the volume of the functional part is smaller, thereby reducing the mold opening and production costs.

[0018] Preferably, the lumbar support comprises a backrest plate and a soft cushion wrapped on the backrest plate, wherein the backrest plate is an elastic plastic part. The soft cushion increases the comfort, and the elastic backrest plate can be deformed with the opening and closing of the armrest frame.

[0019] Preferably, the backing plate is provided with a plurality of vertical hollows and a plurality of grooves, so that the deformation capacity of the backing plate is increased by arranging the hollows and grooves on the backing plate.

[0020] Preferably, a convex seat with a rounded head is provided on the back plate, the convex seat protrudes from the back plate and the head of the convex seat faces the handrail frame, and the handrail frame abuts against the head of the convex seat. The convex seat can be set on the handrail frame or the back plate, and the rounded head of the convex seat can reduce the friction during abutment and sliding.

[0021] Preferably, the lumbar support is mounted on the exercise device and is located in front of the exercise device, and the two armrest frames extend outward from the exercise device and bend forward at the same time.

[0022] As a preferred embodiment, the lumbar support and the two armrests are in abutment and sliding cooperation. When the two armrests are closed and rotated, the lumbar support and the armrests slide relative to each other, and the armrests drive the two ends of the lumbar support to close together. The lumbar support and the armrests are not connected, but are in abutment and sliding cooperation. Under the premise of convenient and simple installation, the lumbar support can also produce corresponding changes through the movement of the armrests, and there will be no interference between the two to hinder the movement.

[0023] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0024] The chair back assembly can, on the one hand, provide variable support and a wrapping feeling for the waist, so that the waist support can more effectively support the human waist and improve comfort; on the other hand, it can correct the sitting posture, enhance the supporting effect of the waist support on the human lumbar spine, reduce the pressure on the waist and spine, and make people not feel tired when sitting for a long time; under the action of the motion device, the two armrests rotate synchronously in opposite directions, so as to realize the synchronous opening and closing movement of the two armrests, and the armrests slide against the waist support, so as to further realize the opening and closing movement of the armrests to drive the opening and closing movement of the waist support, which is very simple and convenient to operate and is conducive to user adjustment; because the two armrests are linked, the rotation directions are different but the rotation angles are the same, so as to realize the symmetrical opening and closing movement of the two ends of the waist support, so that the waist support can clamp the waist more correctly and vertically, and the waist protection effect is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The three-dimensional structure of the chair back assembly in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0026] Figure 2 The three-dimensional structure of the chair back assembly in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of the waist support and the armrest frame abutting against each other in the embodiment of the utility model;

[0028] Figure 4 An exploded view of the handrail frame in the embodiment of the utility model;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the handrail frame in the embodiment of the utility model;

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of the handrail frame arranged on the sports device in the embodiment of the utility model;

[0031] Figure 7 This is a schematic diagram of the three-dimensional structure of the base in the embodiment of the utility model;

[0032] Figure 8 It is a front view of the base in the embodiment of the utility model;

[0033] Fig. 9 This is a schematic diagram of a three-dimensional structure in which a linkage mechanism and a locking mechanism are arranged on a base in an embodiment of the utility model;

[0034] Fig.10 It is a three-dimensional structural schematic diagram of the meshing teeth on the linkage part and the gear in the embodiment of the utility model;

[0035] Fig.11 The three-dimensional structure diagram of the utility model in which the ratchet teeth on the gear part are meshed with the locking teeth of the slider and the convex shaft is located at the front end of the arc waist hole Figure 1 ;

[0036] Fig.12 The three-dimensional structure diagram of the utility model in which the ratchet teeth on the gear part are meshed with the locking teeth of the slider and the convex shaft is located at the front end of the arc waist hole Figure 2 ;

[0037] Fig.13 The three-dimensional structure diagram of the utility model is that after the handrail frame is closed and rotated in the embodiment, the ratchet teeth on the gear part are engaged with the locking teeth of the slider and the convex shaft is located at the rear end of the arc waist hole Figure 1 ;

[0038] Fig.14 The three-dimensional structure diagram of the utility model is that after the handrail frame is closed and rotated in the embodiment, the ratchet teeth on the gear part are engaged with the locking teeth of the slider and the convex shaft is located at the rear end of the arc waist hole Figure 2 ;

[0039] Fig.15 The three-dimensional structure diagram of the self-circulating member pushing the slider to disengage the ratchet and the locking tooth in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0040] Fig.16 The three-dimensional structure diagram of the self-circulating member pushing the slider to disengage the ratchet and the locking tooth in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0041] Fig.17 A bottom view of the embodiment of the utility model in which the self-circulating member pushes the slider to disengage the ratchet teeth from the locking teeth;

[0042] Fig.18 In the embodiment of the utility model, when the ratchet and the locking tooth are disengaged, the angle between the two functional parts on the base is Figure 6 Smaller;

[0043] Fig.19 It is a three-dimensional structural schematic diagram of the functional parts in the embodiment of the utility model;

[0044] Fig. 20 It is a three-dimensional structural schematic diagram of the self-circulating member in the embodiment of the utility model;

[0045] Fig.21 An exploded view of a lumbar support in an embodiment of the utility model;

[0046] Fig. 22 It is a front view of the back plate in the embodiment of the utility model;

[0047] Fig.23 This is a schematic diagram of the three-dimensional structure of the backing plate in the embodiment of the utility model;

[0048] Fig.24 It is a schematic diagram of the deformation of the lumbar support under the action of the armrest frame in the embodiment of the utility model.

[0049] The reference numerals of the figures are as follows: back support 1; sports device 2; lumbar support 3; backrest 31; cushion 32; armrest frame 4; main body 5; functional part 6; connecting part 61; rotating part 62; convex seat 7; head 71; base 8; rotating accommodating space 9; sliding accommodating space 10; linkage accommodating space 11; first rotating shaft 12; gear part 13; ratchet 131; linkage part 14; meshing tooth 141; gear 15; second rotating shaft 16; slider 17; locking tooth 171; spring 18; self-circulating part 19; arc-shaped waist hole 191; front end 1911; rear end 1912; anti-slip boss 192; avoidance groove 20; convex shaft 21; hollow 22; groove 23. DETAILED DESCRIPTION

[0050] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. 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.

[0051] 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.

[0052] 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.

[0053] The specific implementation of the utility model is as follows:

[0054] like Figure 1-3 As shown in Figures 24, the utility model provides a chair back assembly for enhancing lumbar support, comprising a back support 1, a motion device 2, a lumbar support 3 and two armrest frames 4 arranged on both sides of the motion device 2, the lumbar support 3 is installed on the motion device 2, the motion device 2 is installed on the back support 1, and the two armrest frames 4 are rotatably arranged on the motion device 2 around a vertical axis; the lumbar support 3 is located between the two armrest frames 4, and the lumbar support 3 and the two armrest frames 4 are in abutment and sliding cooperation, and the motion device 2 is configured to link the armrest frames 4 on both sides to rotate, so that the two armrest frames 4 are synchronously opened and closed, and the two armrest frames 4 are maintained at the current rotation position; when the two armrest frames 4 rotate in the closing direction, the lumbar support 3 and the armrest frames 4 slide relative to each other, and the armrest frames 4 drive the two ends of the lumbar support 3 to approach each other and close and embrace the human waist; when the two armrest frames 4 are opened and rotated, the lumbar support 3 and the armrest frames 4 slide relative to each other, and the armrest frames 4 drive the two ends of the lumbar support 3 to move away from each other and open.

[0055] The chair back assembly can, on the one hand, provide variable support and a wrapping feeling for the waist, so that the waist support 3 can more effectively support the human waist and improve comfort; on the other hand, it can correct the sitting posture, enhance the supporting effect of the waist support 3 on the human lumbar spine, reduce the pressure on the waist and spine, and make people not tired when sitting for a long time; under the action of the motion device 2, the two armrest frames 4 rotate synchronously in opposite directions, so as to realize the synchronous opening and closing movement of the two armrest frames 4, and the armrest frames 4 slide against the waist support 3, so as to further realize the opening and closing movement of the armrest frames 4 to drive the opening and closing movement of the waist support 3, which is very simple and convenient to operate and is conducive to user adjustment; because the two armrest frames 4 are linked, the rotation directions are different but the rotation angles are the same, so as to realize the symmetrical opening and closing movement of the two ends of the waist support 3, so that the waist support 3 can clamp the waist more correctly and vertically, and the waist protection effect is strong.

[0056] Specifically, if Figure 3-5 As shown, the lumbar support 3 is installed on the sports device 2 and is located in front of the sports device 2. The two armrest frames 4 extend outward from the sports device 2 and bend forward at the same time. Therefore, in the left and right directions, the sports device 2 and the two armrest frames 4 have a convex curvature toward the rear as a whole, and the lumbar support 3 generally also has a convex curvature toward the rear. The sports device 2 and the two armrest frames 4 are adapted to the lumbar support 3 as a whole; the armrest frame 4 includes a main body 5 and a functional part 6, the main body 5 is fixedly connected to the functional part 6, and the main body 5 of the armrest frame 4 is connected to the functional part 6. The lumbar support 3 is butted against each other by a convex seat 7 having a rounded head 71. The convex seat 7 is approximately a triangular prism, and one of the edges of the head 71 is rounded to become rounded; the convex seat 7 can be set on the armrest 4 or the backboard 31. In this embodiment, the convex seat 7 is set on the lumbar support 3, and the convex seat 7 protrudes from the lumbar support 3 and the head 71 of the convex seat 7 faces the armrest 4. The main body 5 of the armrest 4 abuts against the head 71 of the convex seat 7. The rounded head 71 of the convex seat 7 can reduce the friction during abutment and sliding. Of course, the armrest 4 and the lumbar support 3 can also be butted against each other in a variety of ways, such as setting a rolling ball in the armrest 4 or the lumbar support 3.

[0057] like Figure 5-9As shown, the motion device 2 includes a base 8, which is lifted and lowered on the back support 1. The base 8 has a plurality of accommodating spaces, including a rotating accommodating space 9, a sliding accommodating space 10, and a linkage accommodating space 11. There are two rotating accommodating spaces 9, which are symmetrically arranged on the base 8 and located at the left and right ends of the base 8. The functional part 6 of the armrest frame 4 includes a connecting portion 61 and a rotating portion 62. The connecting portion 61 and the rotating portion 62 are integrally formed, and the connecting portion 61 and the main body of the armrest frame 4 are connected. 5 is fixedly connected, the rotating part 62 is arranged in the rotating accommodation space 9, the rotating part 62 is roughly semi-cylindrical, and the side surface thereof located in the rotating accommodation space 9 is a circular arc surface. Correspondingly, the wall of the rotating accommodation space 9 is a circular arc surface. The rotating part 62 is provided with a first rotating shaft 12 connected to the base 8 at the central axis of the circular arc surface. The handrail frame 4 is rotatably connected to the base 8 through the rotating part 62 and the first rotating shaft 12; the base 8 is provided with a linkage mechanism in the linkage accommodation space 11, and the base 8 is in the sliding accommodation space 10 is provided with a locking mechanism, and the linkage mechanism and the locking mechanism are arranged at intervals on the base 8. Correspondingly, the functional part 6 of the armrest frame 4 is provided with a gear portion 13 on the side of the rotating part 62 facing the sliding accommodating space 10, and the functional part 6 of the armrest frame 4 is provided with a linkage portion 14 on the side of the rotating part 62 facing the linkage accommodating space 11. The linkage portion 14 and the gear portion 13 are arranged at intervals on the armrest frame 4. Such an arrangement can make the overall structure simpler and more compact; in this embodiment, the linkage portion 14 is located above the gear portion 13, and the linkage accommodating space 11 is located above the sliding accommodating space 10 and the two are separated; the functional part 6 is rotatably connected to the base 8, and the linkage portion 14 and the gear portion 13 are both arranged on the functional part 6. Directly arranging the linkage portion 14 and the gear portion 13 on the main body 5 of the armrest frame 4 will make the overall structure of the main body 5 very complicated, and the mold opening and manufacturing costs are too high. After the armrest frame 4 is divided into the main body 5 and the functional part 6, the structure of the main body 5 is simple, and the volume of the functional part 6 is smaller, thereby reducing the mold opening and manufacturing costs. The linkage mechanism is a four-bar linkage, and the linkage part 14 is a connecting rod.

[0058] like Figure 6 , 9As shown in Figures 10, the linkage part 14 on the handrail frame 4 is connected to the linkage mechanism on the base 8 by transmission. The linkage part 14 and the linkage mechanism are configured so that when the handrail frame 4 on one side rotates, the linkage part 14 is transmitted to the linkage part 14 of the handrail frame 4 on the other side through the linkage mechanism and drives the handrail frame 4 on the other side to rotate. The linkage part 14 on the handrail frame 4 cooperates with the linkage mechanism in the motion device 2 to realize the synchronous opening and closing linkage of the handrail frames 4 on both sides. Specifically, the linkage mechanism includes two gears 15, which are meshed and arranged laterally in the linkage accommodating space 11 of the base 8. The linkage accommodating space 11 is horizontally connected with the rotating accommodating space 9 on both sides, and the two gears 15 are rotatably connected to the base 8 through a vertical second rotating shaft 16; the linkage part 14 includes a plurality of meshing teeth 141, and the meshing teeth 141 on the two handrails 4 are respectively meshed with the two gears 15; through the plurality of gears 15, while realizing the linkage of the two handrails 4, the handrail 4 on one side can be rotated counterclockwise and the handrail 4 on the other side can be rotated clockwise, thereby realizing the opening and closing movement of the two handrails 4; and the gear 15 is smaller in size, making the structure more compact.

[0059] like Figure 11-20 As shown, the gear portion 13 on the armrest 4 cooperates with the locking mechanism on the base 8, and the gear portion 13 and the locking mechanism are configured to keep the current position of the armrest 4 after rotation, and the gear portion 13 and the locking mechanism allow the rotation of the armrest 4 to have multiple gears, so that the armrest 4 can stay in the current position after rotation; specifically, the gear portion 13 includes a plurality of ratchets 131 arranged toward the sliding accommodating space 10; the locking mechanism includes two sliders 17 symmetrically arranged on the base 8 and a spring 18 arranged between the two sliders 17, the two sliders 17 are slidably arranged in the sliding accommodating space 10 of the base 8, and the sliding accommodating space 10 is horizontally connected with the rotating accommodating space 9 on both sides; the slider 17 includes a locking tooth 171 meshing with the ratchet 131, and the ratchet 131 and the locking tooth 171 are one-way self-locking; the lock The fixed tooth 171 is located at one end of the slider 17 facing the armrest, and the spring 18 is inserted in the other end of the slider 17; there are multiple locking teeth 171, and when the two armrest frames 4 are closed and rotated, the locking teeth 171 engage with different ratchet teeth 131 and switch between different ratchet teeth 131; when the two armrest frames 4 have a tendency to open and rotate, the ratchet teeth 131 and the locking teeth 171 are self-locking; the one-way self-locking of the ratchet teeth 131 and the locking teeth 171 can achieve the effect of keeping the armrest frame 4 in the current position after rotation, thereby realizing the function of the gear position; the spring 18 allows the two sliders 17 to slide and reset, and when the armrest frames 4 are closed and rotated, the two sliders 17 slide close to each other, allowing the locking teeth 171 to switch between different ratchet teeth 131; a plurality of locking teeth 171 can increase the stability when the locking teeth 171 are engaged with the ratchet teeth 131.

[0060] A coaxially rotating self-circulating part 19 is provided on the handrail frame 4. Specifically, an avoidance groove 20 is provided on the rotating part 62. The self-circulating part 19 is arranged in the avoidance groove 20, and the self-circulating part 19 is arranged on the first rotating shaft 12. The self-circulating part 19 can rotate around the first rotating shaft 12 relative to the base 8; further, an arc-shaped waist hole 191 is provided on the self-circulating part 19, and the arc-shaped waist hole 191 is arranged at the end of the self-circulating part 19 away from the first rotating shaft 12. A convex shaft 21 inserted in the arc-shaped waist hole 191 is provided on the handrail frame 4. When the handrail frame 4 rotates, the convex shaft 21 moves in the arc-shaped waist hole 191; specifically, the convex shaft 21 is arranged on the rotating part 62, and the convex shaft 21 is arranged on the groove wall of the avoidance groove 20 and the convex shaft 21 protrudes downward from the groove wall of the avoidance groove 20.

[0061] like Fig. 20 As shown, the arc-shaped waist hole 191 has a front end 1911 and a rear end 1912, and the self-circulating member 19 is configured such that when the two handrail frames 4 are fully opened, the convex shaft 21 is located at the front end 1911 of the arc-shaped waist hole 191, and when the two handrail frames 4 are closed, the convex shaft 21 moves from the front end 1911 of the arc-shaped waist hole 191 to the rear end 1912; after the convex shaft 21 abuts against the rear end 1912 of the arc-shaped waist hole 191, the two handrail frames 4 continue to close, and the convex shaft 21 drives the self-circulating member 19 to rotate, and the two self-circulating members 19 push the two sliders 17 to approach each other and disengage the ratchet 131 from the locking tooth 171, so that the two handrail frames 4 can be opened and reset; in other words, the self-circulating member 19 The ring member 19 is driven by the rotation of the armrest frame 4. When the armrest frame 4 is closed and rotated to the final gear position, the convex shaft 21 is located at the rear end 1912 of the arc-shaped waist hole 191. The armrest frame 4 continues to be closed and rotated, and the convex shaft 21 of the armrest frame 4 can drive the self-circulating member 19 to rotate, and let the self-circulating member 19 rest against the slider 17, so that the locking tooth 171 and the ratchet tooth 131 on the slider 17 are always kept disengaged. At this time, the armrest frame 4 can be opened and rotated. After the convex shaft 21 returns to the front end 1911 of the arc-shaped waist hole 191 and continues to rotate, the slider 17 can be unlocked. The slider 17 is reset under the action of the spring 18, so that the locking tooth 171 and the ratchet tooth 131 are re-engaged.

[0062] Furthermore, an anti-slip boss 192 is provided on the self-circulating part 19, and the anti-slip boss 192 is configured to abut against the slider 17 after the two self-circulating parts 19 push the two sliders 17 closer to each other, thereby preventing the self-circulating part 19 and the slider 17 from disengaging during the return process of the handrail frame 4 and causing the ratchet 131 to engage with the locking tooth 171; after the self-circulating part 19 pushes the slider 17, the anti-slip boss 192 abuts against the side of the slider 17. The purpose of the anti-slip boss 192 is to prevent the self-circulating part 19 from rotating prematurely and unlocking the slider 17, thereby ensuring that the self-circulating part 19 and the slider 17 can be unlocked and the locking tooth 171 can be re-engaged with the ratchet 131 after the handrail frame 4 is opened, rotated and completely reset.

[0063] like Figure 21-23 As shown, there are many ways to achieve the opening and closing movement of the lumbar support 3, such as hingedly connecting the two side wings of the lumbar support 3 to the middle part of the lumbar support 3. In the present solution, the opening and closing of the lumbar support 3 is achieved directly through the elasticity of the lumbar support 3, which has a simple structure and lower cost. Specifically, the lumbar support 3 is elastic. When the two armrests 4 are closed and rotated, the lumbar support 3 and the armrests 4 slide relative to each other, and at the same time, the lumbar support 3 produces elastic deformation of the two ends closing and embracing the human waist. When the two armrests 4 are opened and rotated, the lumbar support 3 and the armrests 4 slide relative to each other, and at the same time, the lumbar support 3 restores the elastic deformation. More specifically, the lumbar support 3 includes a backrest plate 31 and a soft pad 32 wrapped on the backrest plate 31, the backrest plate 31 is an elastic plastic part, and the protrusion 7 is arranged on the backrest plate 31. The soft pad 32 increases the comfort, and the elastic backrest plate 31 can be deformed with the opening and closing of the armrests 4.

[0064] Furthermore, a plurality of vertical hollows 22 and a plurality of grooves 23 are provided on the backing plate 31 , and the deformation capacity of the backing plate 31 is increased by providing the hollows 22 and the grooves 23 on the backing plate 31 .

Claims

1. A chair back assembly for improving lumbar support, characterized in that: The utility model comprises a back support, a movement device, a lumbar support and two armrests arranged on both sides of the movement device, the lumbar support is installed on the movement device, the movement device is installed on the back support, and the two armrests are rotatably arranged on the movement device around a vertical axis; the lumbar support is located between the two armrests, and the lumbar support and the two armrests are abutted and slidably matched, and the movement device is configured to link the armrests on both sides to rotate, so that the two armrests can open and close synchronously, and the two armrests can be maintained at the current rotation position; when the two armrests rotate in the closing direction, the lumbar support and the armrests slide relative to each other, and the armrests drive the two ends of the lumbar support to approach each other; when the two armrests are opened and rotated, the lumbar support and the armrests slide relative to each other, and the armrests drive the two ends of the lumbar support to move away from each other and open.

2. The chair back assembly for enhancing lumbar support according to claim 1, characterized in that: The lumbar support is elastic. When the two armrests rotate toward closing, the lumbar support and the armrests slide relative to each other, and at the same time, the lumbar support produces elastic deformation with a tendency to close at both ends; when the two armrests are opened and rotated, the lumbar support and the armrests slide relative to each other, and at the same time, the lumbar support recovers its elastic deformation.

3. The chair back assembly for enhancing lumbar support according to claim 1, characterized in that: The motion device includes a base, which is arranged on a back support, a linkage mechanism is arranged on the base, and a linkage part is arranged on the handrail, which is transmission-connected with the linkage mechanism; when the linkage part and the linkage mechanism are configured so that when the handrail on one side rotates, the linkage part is transmitted to the linkage part of the handrail on the other side through the linkage mechanism and drives the handrail on the other side to rotate.

4. The chair back assembly for enhancing lumbar support according to claim 3, characterized in that: The linkage mechanism comprises two gears, which are meshed and arranged transversely in the base; the linkage part comprises a plurality of meshing teeth, and the meshing teeth on the two handrail frames are respectively meshed with the two gears.

5. The chair back assembly for enhancing lumbar support according to claim 3, characterized in that: The linkage mechanism is a four-bar linkage, and the linkage part is a connecting rod.

6. The chair back assembly for enhancing lumbar support according to claim 3, characterized in that: The base is also provided with a locking mechanism, and the armrest frame is provided with a shift portion, which cooperates with the locking mechanism; the shift portion and the locking mechanism are configured to maintain the current position of the armrest frame after the armrest frame is rotated.

7. The chair back assembly for enhancing lumbar support according to claim 6, characterized in that: The gear portion includes a plurality of ratchets; the locking mechanism includes two sliders symmetrically arranged on the base and a spring arranged between the two sliders, the two sliders are slidably arranged on the base, the sliders include locking teeth meshed with the ratchets, and the ratchets and the locking teeth are one-way self-locking; when the two handrail frames are closed and rotated, the locking teeth are meshed with different ratchets; when the two handrail frames have a tendency to open and rotate, the ratchets and the locking teeth are self-locking.

8. The chair back assembly for enhancing lumbar support according to claim 7, characterized in that: The handrail frame is provided with a coaxially rotating self-circulating part, the self-circulating part is provided with an arc-shaped waist hole, and the handrail frame is provided with a convex shaft inserted in the arc-shaped waist hole. When the handrail frame rotates, the convex shaft moves in the arc-shaped waist hole; the arc-shaped waist hole has a front end and a rear end, and the self-circulating part is configured so that when the two handrail frames are fully opened, the convex shaft is located at the front end of the arc-shaped waist hole, and when the two handrail frames are closed, the convex shaft moves from the front end to the rear end of the arc-shaped waist hole; after the convex shaft abuts against the rear end of the arc-shaped waist hole, the two handrail frames continue to close, and the convex shaft drives the self-circulating part to rotate, and the two self-circulating parts push the two sliders to approach each other and disengage the ratchet and the locking tooth, so that the two handrails can be opened and reset.

9. The chair back assembly for enhancing lumbar support according to claim 8, characterized in that: An anti-slip boss is provided on the self-circulating part, and the anti-slip boss is configured so that after the two self-circulating parts push the two sliders closer to each other, the anti-slip boss abuts against the slider to prevent the self-circulating part from disengaging from the slider during the return process of the handrail frame, causing the ratchet and the locking tooth to engage.

10. The chair back assembly for enhancing lumbar support according to claim 6, characterized in that: The linkage mechanism and the locking mechanism are arranged at intervals on the base, and correspondingly, the linkage part and the shift part are arranged at intervals on the handrail frame.

11. The chair back assembly for enhancing lumbar support according to claim 6, characterized in that: The armrest frame comprises a main body and a functional part, the main body is fixedly connected to the functional part, the functional part is rotatably connected to the base, and the linkage part and the gear part are both arranged on the functional part.

12. The chair back assembly for enhancing lumbar support according to claim 2, characterized in that: The lumbar support comprises a support plate and a soft cushion wrapped on the support plate, and the support plate is an elastic plastic part.

13. The chair back assembly for enhancing lumbar support according to claim 12, characterized in that: A plurality of vertical hollows and grooves are arranged on the back plate.

14. The chair back assembly for enhancing lumbar support according to claim 12, characterized in that: A convex seat with a rounded head is arranged on the back plate, the convex seat protrudes from the back plate, the head of the convex seat faces the handrail frame, and the handrail frame abuts against the head of the convex seat.

15. The chair back assembly for enhancing lumbar support according to claim 1, characterized in that: The lumbar support is mounted on the sports device and is located in front of the sports device, and two armrest frames extend outward from the sports device and are bent forward at the same time.

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