Chair and waist rest adjusting structure thereof

Abstract

The utility model discloses a chair and a waist rest adjusting structure thereof, the chair comprises a mounting bracket, a waist rest and a massage machine core, the waist rest is arranged on the mounting bracket in a manner of sliding back and forth, and the massage machine core is arranged in the middle of the waist rest in a manner of moving back and forth; the second driving mechanism is used for driving the waist rest to move back and forth, and the second driving mechanism is mounted on the mounting bracket; the first driving mechanism is used for driving the massage machine core to move back and forth; the first driving mechanism comprises a control mechanism and a telescopic assembly, the massage machine core is installed on the waist rest through the telescopic assembly, and the control mechanism is arranged between the installation support and the telescopic assembly. Therefore, the positions of the waist rest and the waist massage machine core can be independently controlled, the waist rest is controlled to follow a person through the second driving mechanism and the first driving mechanism, and automatic waist following is achieved; and the second driving mechanism and the first driving mechanism independently control the positions of the waist rest and the massage machine core, so that a better supporting effect and better use experience are provided for a user.

Description

Technical Field

[0001] This utility model relates to the field of home furnishings, and in particular to a chair and its lumbar support adjustment structure. Background Technology

[0002] Massage devices are popular health care appliances. Back massage is often achieved through massage chairs, which are constantly being updated and new models are emerging. Massage chairs work by massaging, kneading, and tapping specific parts of the body to relax muscles, improve blood circulation, and relieve fatigue.

[0003] The prior art disclosed in CN219847316U is a massage mesh chair and its backrest assembly, including a lumbar massage mechanism, and an adjustment assembly for adjusting the front and rear position of the lumbar massage mechanism. The adjustment assembly includes a first bracket, a second bracket, a first connecting rod, and a second connecting rod. The second bracket is fixed to the backrest frame, and the first bracket is located in front of the second bracket. One end of the first connecting rod is slidably connected to the second bracket, and the other end of the first connecting rod is hinged to the first bracket. One end of the second connecting rod is hinged to the second bracket, and the other end of the first bracket is slidably connected to the first bracket. The first and second connecting rods are arranged crosswise and hinged. The adjustment assembly also includes a driving component that moves the second bracket and the first bracket closer to or further away from each other.

[0004] In existing technology, only the position of the massage mechanism can be adjusted, but it is impossible to make the lumbar support follow the user or adjust the support position of the lumbar support, thus reducing the number of people who can use the chair. Utility Model Content

[0005] In order to solve the problem that the lumbar support and massage mechanism in the existing technology cannot move synchronously and cannot automatically follow the user, the purpose of this utility model is to provide a chair and its lumbar support adjustment structure, which can realize the lumbar support following the user and automatically follow the waist; and provide users with better support and user experience.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a lumbar support adjustment structure, including a mounting bracket, a lumbar support, and a massage mechanism. The lumbar support is slidably mounted on the mounting bracket, and the massage mechanism is movable forward and backward at the middle position of the lumbar support. It also includes a second drive mechanism for driving the lumbar support to move forward and backward, the second drive mechanism being mounted on the mounting bracket. Furthermore, it includes a first drive mechanism for driving the massage mechanism to move forward and backward; the first drive mechanism includes a control mechanism and a telescopic component, the massage mechanism being mounted on the lumbar support via the telescopic component, and the control mechanism being disposed between the mounting bracket and the telescopic component.

[0007] When the first control mechanism drives the lumbar support to move, the lumbar support can drive the telescopic component and the massage mechanism to move. The relative movement of the telescopic component and the control mechanism changes the state of the telescopic component, causing the massage mechanism and the lumbar support to move relative to each other.

[0008] Preferably, the second drive mechanism includes a motor, a bidirectional screw, a first drive rod, and a second drive rod. The bidirectional screw is rotatably mounted on the mounting bracket and includes a first threaded portion and a second threaded portion with opposite threads. One end of the first drive rod is threadedly connected to the first threaded portion, and the other end of the first drive rod is hinged to the backrest. One end of the second drive rod is threadedly connected to the second threaded portion, and the other end of the second drive rod is hinged to the backrest. The motor is mounted on the mounting bracket and connected to the bidirectional screw.

[0009] Preferably, the end of the first drive rod is provided with a third notch, the first nut is located in the third notch, the first nut is hinged to the first drive rod, and the first nut is sleeved on the first threaded part of the bidirectional screw; the end of the second drive rod is provided with a fourth notch, the second nut is located in the fourth notch, the second nut is hinged to the second drive rod, and the second nut is sleeved on the second threaded part of the bidirectional screw.

[0010] Preferably, the first drive mechanism further includes a first connecting bracket and a second connecting bracket, the first connecting bracket being fixed inside the mounting bracket, the massage mechanism being mounted on the second connecting bracket, and the telescopic component being disposed between the first connecting bracket and the second connecting bracket; the control mechanism is disposed between the telescopic component and the mounting bracket.

[0011] Preferably, the telescopic assembly includes a third drive rod and a fourth drive rod. The rear end of the third drive rod is hinged to the first connecting bracket, the front end of the third drive rod is slidably connected to the second connecting bracket, the rear end of the fourth drive rod is slidably connected to the first connecting bracket, and the front end of the fourth drive rod is hinged to the second connecting bracket.

[0012] Preferably, the hinge ends of the third and fourth drive rods are located on the right side of the massage mechanism.

[0013] Preferably, the left end of the first connecting bracket is provided with a first sliding hole, the left end of the second connecting bracket is provided with a second sliding hole, the rear end of the third drive rod is slidably engaged with the first sliding hole of the first connecting bracket, and the front end of the fourth drive rod is slidably engaged with the second sliding hole of the second connecting bracket.

[0014] Preferably, the control mechanism includes a cable and a drive unit, the drive unit is mounted on a mounting bracket, one end of the cable is connected to the drive unit, and the other end of the cable is connected to a third drive rod or a fourth drive rod.

[0015] Preferably, the control component includes a third nut and a control screw. The control screw is rotatably mounted on the back plate of the mounting bracket, the third nut is sleeved on the control screw, and the third nut is slidably mounted on the back plate. One end of the cable is connected to the third nut.

[0016] A chair comprising the aforementioned lumbar support adjustment structure.

[0017] The beneficial effects of the technical solution of this utility model are: the positions of the lumbar support and the lumbar massage core can be controlled independently, and the lumbar support can be controlled to follow the person through the second drive mechanism and the first drive mechanism to achieve automatic waist tracking;

[0018] The second drive mechanism and the first drive mechanism independently control the position of the lumbar support and the massage mechanism, thereby providing users with better support and user experience;

[0019] When the lumbar support moves the massage mechanism via the telescopic component, the control mechanism and the telescopic component move relative to each other, thereby changing the state of the telescopic component and thus changing the support force of the massage mechanism. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a chair;

[0021] Figure 2 Schematic diagram of the connection structure of the lumbar support adjustment mechanism Figure 1 ;

[0022] Figure 3 Schematic diagram of the connection structure of the lumbar support adjustment mechanism Figure 2 ;

[0023] Figure 4 A schematic diagram of the connection structure of the lumbar support adjustment mechanism after the back panel is removed;

[0024] Figure 5 A schematic diagram of the connection structure of the lumbar support adjustment mechanism is shown after removing the external accessories and backrest.

[0025] Figure 6 A schematic diagram of the connection structure of the lumbar support adjustment mechanism after removing the lumbar support and lumbar support mechanism;

[0026] Figure 7 The diagram shows the connection structure of the lumbar support adjustment mechanism after removing the back panel and external accessories.

[0027] Figure 8 Schematic diagram of the first drive mechanism Figure 1 ;

[0028] Figure 9 Schematic diagram of the first drive mechanism Figure 2 ;

[0029] Figure 10This is a schematic diagram of the second drive mechanism;

[0030] Figure 11 Schematic diagram of the lumbar support structure Figure 1 ;

[0031] Figure 12 Schematic diagram of the lumbar support structure Figure 2 ;

[0032] Figure 13 This is a schematic diagram of the back panel structure.

[0033] Attached reference numerals: 1. Back frame;

[0034] 2. Mounting bracket; 21. Back panel; 22. Connector; 23. Housing; 24. Mounting base;

[0035] 3. Lumbar support; 31. Connecting part; 32. Second receiving cavity; 34. Third receiving cavity; 35. Fourth receiving cavity;

[0036] 4. Backrest; 41. Elastic components;

[0037] 5. Massage mechanism;

[0038] 6. First drive mechanism; 61. First connecting bracket; 62. Second connecting bracket; 63. Third drive rod; 64. Linkage rod; 65. Fourth drive rod; 66. Cable; 67. Third nut; 68. Control screw; 69. Handle;

[0039] 7. Second drive mechanism; 71. Motor; 72. First bearing housing; 73. Second bearing housing; 74. Double-acting screw; 75. First nut; 76. Second nut; 77. First drive rod; 78. Second drive rod; 79. Motor housing;

[0040] 8. Chair seat. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] like Figures 1 to 13 The lumbar support adjustment structure shown includes a mounting bracket 2, a lumbar support 3, and a massage mechanism 5. The lumbar support 3 is mounted on the mounting bracket 2 in a way that allows it to slide back and forth, and the massage mechanism 5 is mounted in the middle position of the lumbar support 3 in a way that allows it to move back and forth.

[0047] It also includes a second drive mechanism 7 for driving the lumbar support 3 to move back and forth; it also includes a first drive mechanism 6 for driving the massage mechanism 5 to move back and forth; when the state of the lumbar support 3 is adjusted by the second drive mechanism 7, the lumbar support 3 can change the state of the first drive mechanism 6, thereby changing the support force of the massage mechanism 3.

[0048] With this configuration, the positions of the lumbar support 3 and the lumbar massage mechanism 5 can be controlled independently. The lumbar support 3 is controlled to follow the user through the second drive mechanism 7 and the first drive mechanism 6, achieving automatic waist tracking. Furthermore, the second drive mechanism 7 and the first drive mechanism 6 independently control the positions of the lumbar support 3 and the massage mechanism 5, thereby providing users with better support and a better user experience.

[0049] In this embodiment, as Figures 2 to 6 As shown, the mounting bracket 2 includes a back plate 21 and a mounting base 24, with the mounting base 24 fixed to the front end of the back plate 21; the mounting base 24 has a first receiving cavity with a forward opening; as shown... Figure 11 and Figure 12 As shown, the lumbar support 3 is provided with a rearwardly extending connecting part 31, which is inserted into the first accommodating cavity and slidably engaged; the second drive mechanism is provided between the back plate 21 and the connecting part 31; the connecting part 31 is provided with a second accommodating cavity 32, and the massage core 5 is provided in the second accommodating cavity 32. The first drive mechanism includes a telescopic component and a control mechanism. The telescopic component is provided in the second accommodating cavity 32, and the massage core 5 is mounted on the connecting part 31 of the lumbar support 3 through the telescopic component. The control mechanism is provided between the telescopic component and the back plate 21. The massage core 5 can move with the lumbar support 3. When the lumbar support 3 moves forward, the control mechanism can drive the massage core 5 to move forward through the telescopic component.

[0050] In this embodiment, as Figures 6 to 10 As shown, the second drive mechanism 7 includes a motor 71, a bidirectional screw 74, a first drive rod 77, and a second drive rod 78. The bidirectional screw 74 is rotatably mounted on the back plate 21. The bidirectional screw 74 includes a first threaded portion and a second threaded portion with opposite threads. One end of the first drive rod 77 is threadedly connected to the first threaded portion, and the other end of the first drive rod 77 is hinged to the connecting portion 31 of the lumbar support 3. One end of the second drive rod 78 is threadedly connected to the second threaded portion, and the other end of the second drive rod 78 is hinged to the connecting portion 31 of the lumbar support 3. The motor 71 is mounted on the back plate 21 and connected to the bidirectional screw 74.

[0051] Further preferred, such as Figure 10 As shown, the first drive rod 77 and the second drive rod 78 are arranged in an intersecting manner. Furthermore, the top of the first drive rod 77 is provided with a first notch, and the bottom of the second drive rod 78 is provided with a second notch, and the first notch and the second notch are fastened together; thereby making the second drive mechanism 7 thinner.

[0052] More preferably, the end of the first drive rod 77 is provided with a third notch, the first nut 75 is located in the third notch, the first nut 75 is hinged to the first drive rod 77, and the first nut 75 is sleeved on the first threaded portion of the bidirectional screw 74; the end of the second drive rod 78 is provided with a fourth notch, the second nut 76 is located in the fourth notch, the second nut 76 is hinged to the second drive rod 78, and the second nut 76 is sleeved on the second threaded portion of the bidirectional screw 74.

[0053] Further preferred, such as Figure 11 and Figure 12 As shown, the rear end of the connecting part 31 on the lumbar support 3 is provided with a third receiving cavity 34 with a rearward opening. One end of the first drive rod 77 and one end of the second drive rod 78 extend into the third receiving cavity 34 and are hinged to the connecting part 31 of the lumbar support 3. The rear end of the connecting part 31 is provided with a fourth receiving cavity 35 with a rearward opening. When the lumbar support 3 moves to its rearmost position, the motor 71 can be inserted into the fourth receiving cavity 35. In this way, the thickness of the lumbar support 3 and the mounting bracket 2 can be further reduced.

[0054] Further preferred, such as Figure 6 and Figure 10 As shown, the first bearing seat 72 and the second bearing seat 73 are fixed on the back plate 21, and the two ends of the bidirectional screw 74 are respectively mounted on the first bearing seat 72 and the second bearing seat 73 through two bearings; the motor 71 is mounted on the back plate 21 through the motor seat.

[0055] In this embodiment, as Figures 4 to 8 As shown, the first drive mechanism 6 also includes a first connecting bracket 61 and a second connecting bracket 62. The first connecting bracket 61 is fixed in the second accommodating cavity 32 of the connecting part 31, the massage mechanism is installed on the second connecting bracket 62, and the telescopic component is disposed between the first connecting bracket 61 and the second connecting bracket 62. The control mechanism is disposed between the telescopic component and the back plate 21.

[0056] In this embodiment, as Figures 4 to 8 As shown, the telescopic assembly includes a third drive rod 63 and a fourth drive rod 65. The rear end of the third drive rod 63 is slidably connected to the first connecting bracket 61, and the front end of the third drive rod 63 is hinged to the second connecting bracket 62. The rear end of the fourth drive rod 65 is hinged to the first connecting bracket 61, and the front end of the fourth drive rod 65 is slidably connected to the second connecting bracket 62.

[0057] Further preferred, such as Figures 4 to 8 As shown, the hinge ends of the third drive rod 63 and the fourth drive rod 65 are located on the right side of the massage mechanism 5.

[0058] Further preferred, such as Figures 4 to 8As shown, the left end of the first connecting bracket 61 is provided with a first sliding hole 611, the left end of the second connecting bracket 62 is provided with a second sliding hole 621, the rear end of the third driving rod 63 is slidably engaged with the first sliding hole 611 of the first connecting bracket 61, and the front end of the fourth driving rod 65 is slidably engaged with the second sliding hole 621 of the second connecting bracket 62.

[0059] A further preferred design is that the two telescopic components are arranged symmetrically, one above the other.

[0060] In this embodiment, the control mechanism includes a cable 66 and a drive member. The drive member is mounted on the back plate 21. One end of the cable 66 is connected to the drive member, and the other end of the cable 66 is connected to the third drive rod 63 or the fourth drive rod 65.

[0061] More preferably, the two third drive rods 63 are fixedly connected by a linkage rod 64, and one end of the cable 66 is connected to the linkage rod 64; specifically, the linkage rod 64 is provided with a hook 641, the tensioning mechanism is provided with a connecting groove, the end of the cable 66 is fixed with a positioning head, the cable 66 passes through the connecting groove, and the positioning head hooks the tensioning mechanism.

[0062] Further preferred, such as Figures 4 to 13 As shown, the control component includes a third nut 67 and a control screw 68. The control screw 68 is rotatably mounted on the back plate 21, and the third nut 67 is sleeved on the control screw 68 and slidably mounted on the back plate 21. One end of the cable 66 is connected to the third nut 67; specifically, as shown... Figure 13 and Figure 6 As shown, a connecting seat 22 protrudes on the back plate 21. The top of the connecting seat 22 is provided with a fifth receiving cavity 221 with an upward opening. The control screw 68 is rotatably installed in the fifth receiving cavity 221 and passes through the fifth receiving cavity 221. The third nut 67 is provided in the fifth receiving cavity 221 and slides with the fifth receiving cavity 221.

[0063] More preferably, a handle 69 is fixed on the control screw 68, and the handle 69 is located on the outside of the mounting bracket 2.

[0064] In this embodiment, a backrest 4 is installed on the top of the back panel 21, and the backrest 4 is installed on the back panel 21 by an elastic member 41; specifically, the back panel 21 is a soft rubber block.

[0065] In this embodiment, the mounting bracket 2 also includes a housing 23, which is sleeved on the mounting base and is fixedly connected to the back plate.

[0066] When the lumbar support moves forward via the second drive mechanism, the motor starts and drives the bidirectional screw to rotate. The bidirectional screw drives the first and second drive rods closer together, gradually straightening them and moving the lumbar support forward. The lumbar support, through the first connecting bracket, the telescopic component, and the second connecting bracket, drives the massage mechanism forward. Since the position of the cable remains unchanged, the cable moves backward relative to the massage mechanism, causing it to pull the third drive rod to rotate via the linkage rod. This causes the third and fourth drive rods to gradually straighten, further moving the massage mechanism forward. Thus, when adjusting the lumbar support, the position of the massage mechanism can be adjusted simultaneously, along with the state of the telescopic components, thereby further improving the support force of the massage mechanism.

[0067] A chair includes the aforementioned lumbar support adjustment mechanism 3; it also includes a backrest 4, which is mounted on a back panel 21 via an elastic element 41; wherein the elastic element 41 includes soft rubber, rubber blocks, or springs, etc. The chair also includes a back frame and a seat, with the back panel 21 fixed to the front end of the back frame and the seat mounted on the bottom of the back frame.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A lumbar support adjustment arrangement, characterized by: The massage device comprises a mounting bracket (2), a waist rest (3) and a massage core (5), the waist rest (3) is arranged on the mounting bracket (2) in a slidable manner, and the massage core (5) is arranged on the waist rest (3) in a movable manner; The massage device further comprises a second driving mechanism (7) for driving the waist rest (3) to move forward and backward, and the first driving mechanism is arranged on the mounting bracket (2); The massage device further comprises a first driving mechanism (6) for driving the massage core (5) to move forward and backward, the first driving mechanism (6) comprises a control mechanism and an extension assembly, the massage core (5) is arranged on the waist rest (3) through the extension assembly, and the control mechanism is arranged between the mounting bracket (2) and the extension assembly; When the second driving mechanism (7) drives the waist rest to move, the waist rest can drive the extension assembly and the massage core to move, the relative movement between the extension assembly and the control mechanism changes the state of the extension assembly, and the massage core and the waist rest move relatively.

2. The lumbar support adjustment structure of claim 1, wherein: The second driving mechanism (7) comprises a motor (71), a bidirectional screw rod (74), a first driving rod (77) and a second driving rod (78), the bidirectional screw rod (74) is rotatably arranged on the mounting bracket (2), the bidirectional screw rod (74) comprises a first threaded portion and a second threaded portion with opposite threads, one end of the first driving rod (77) is threadedly connected with the first threaded portion, the other end of the first driving rod (77) is hingedly connected with the waist rest (3), one end of the second driving rod (78) is threadedly connected with the second threaded portion, the other end of the second driving rod (78) is hingedly connected with the waist rest (3), and the motor (71) is arranged on the mounting bracket (2) and connected with the bidirectional screw rod (74).

3. A lumbar support adjustment arrangement according to claim 2, wherein: An end of the first driving rod (77) is provided with a third notch, a first nut (75) is arranged in the third notch, the first nut (75) is hingedly connected with the first driving rod (77), and the first nut (75) is sleeved on the first threaded portion of the bidirectional screw rod (74); an end of the second driving rod (78) is provided with a fourth notch, a second nut (76) is arranged in the fourth notch, the second nut (76) is hingedly connected with the second driving rod (78), and the second nut (76) is sleeved on the second threaded portion of the bidirectional screw rod (74).

4. The lumbar support adjustment structure of claim 1, wherein: The first driving mechanism (6) further comprises a first connecting bracket (61) and a second connecting bracket (62), the first connecting bracket (61) is fixed in the mounting bracket (2), the massage core (5) is arranged on the second connecting bracket (62), and the extension assembly is arranged between the first connecting bracket (61) and the second connecting bracket (62).

5. A lumbar support adjustment arrangement according to claim 4, wherein: The extension assembly comprises a third driving rod (63) and a fourth driving rod (65), a rear end of the third driving rod (63) is slidably connected with the first connecting bracket (61), a front end of the third driving rod (63) is hingedly connected with the second connecting bracket (62), a rear end of the fourth driving rod (65) is hingedly connected with the first connecting bracket (61), and a front end of the fourth driving rod (65) is hingedly connected with the second connecting bracket (62).

6. A lumbar support adjustment arrangement according to claim 5, wherein: The left end of the first connecting bracket (61) is provided with a first sliding hole (611), the left end of the second connecting bracket (62) is provided with a second sliding hole (621), the rear end of the third driving rod (63) is in sliding fit with the first sliding hole (611) of the first connecting bracket (61), and the front end of the fourth driving rod (65) is in sliding fit with the second sliding hole (621) of the second connecting bracket (62).

7. The lumbar support adjustment structure of claim 4, wherein: The control mechanism comprises a pull cable (66) and a driving part, the driving part is installed on the mounting bracket (2), one end of the pull cable (66) is connected with the driving part, and the other end of the pull cable (66) is connected with the third driving rod (63) or the fourth driving rod (65).

8. A lumbar support adjustment arrangement according to claim 7, wherein: The control part comprises a third nut (67) and a control screw rod (68), the control screw rod (68) is rotationally installed on the back plate (21) of the mounting bracket (2), the third nut (67) is sleeved on the control screw rod (68), the third nut (67) is slidingly installed on the back plate (21), and one end of the pull cable (66) is connected with the third nut (67).

9. A chair characterized by: The lumbar support adjusting structure comprises the lumbar support adjusting structure according to any one of claims 1-8.

Images