Adjustable chair back for seat and seat

Abstract

The utility model discloses an adjustable chair back for a chair and the chair, and belongs to the technical field of chairs, and the adjustable chair back comprises a connecting frame, a chair back and a chair back, the driving mechanism is arranged on the connecting frame; the back support is arranged at the output end of the driving mechanism, and the back support is used for supporting the back of the user; wherein the driving mechanism is used for driving the back support to reciprocate along a set direction. An integrated chair back structure in the prior art is changed and designed into a two-part structure of the connecting frame and the back support, the driving mechanism is arranged on the connecting frame, and the back support can be driven by the driving mechanism to reciprocate in the set direction. Through the arrangement, no matter which sitting posture is adopted by the user or the position is moved relative to the seat cushion, the back support can be driven by the driving mechanism to move, so that the back support keeps supporting the back of the user, and the use requirement of the user is met.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to an adjustable chair back and a seat. Background Art

[0002] The backrest of the chair is used for the user to lean on the back. Traditional chairs generally fix the backrest on the base of the chair. With the enrichment of the functions of the chair, some chairs in the related art are also designed to swing relative to the base, so that the user can rest in a reclining posture after sitting for a long time. For different users (users with different body shapes and different sitting habits), the setting position of the backrest relative to the base will affect whether the backrest can effectively support the user's back. For example, some users are used to sitting forward, while some users are used to sitting backward, which results in the backrest that can effectively support some users but cannot meet the use needs of another part of users. In addition, most users will change their sitting posture and move their position (change the position relative to the seat cushion) many times during the long-term sitting process of work or study. In the above-mentioned change process, the backrest of the chair cannot maintain support for the user's back in some cases. For the above-mentioned users with different use needs, the backrest of the chair in the related art is difficult to meet the needs of all users. Utility Model Content

[0003] The utility model aims to provide an adjustable chair back and a chair, which can adjust the back support position according to the user's position to maintain effective support for the user's back.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An adjustable backrest for a seat, the adjustable backrest comprising:

[0006] A connecting frame, which is used to be installed with the base of the seat;

[0007] a driving mechanism, which is disposed on the connecting frame; and

[0008] A back support, which is arranged at the output end of the driving mechanism, and is used to support the back of the user;

[0009] Wherein, the driving mechanism is used to drive the back support to move back and forth along a set direction.

[0010] Preferably, the driving mechanism comprises a driving motor and a screw-nut transmission mechanism, and the driving motor is connected to the back support through the screw-nut transmission mechanism and drives the back support to reciprocate along a set direction.

[0011] Preferably, the screw-nut transmission mechanism includes a transmission screw, a nut sleeve and a connecting member, the transmission screw is connected to the output shaft of the driving motor and is driven to rotate by the driving motor, the nut sleeve is threadedly matched with the transmission screw, and the connecting member is fixedly connected to the nut sleeve and the back support respectively; the adjustable chair back also includes a limit sleeve fixedly set on the connecting frame, the limit sleeve is arranged on the outside of the connecting member and the two are slidably matched along the set direction.

[0012] Preferably, the inner wall of the limiting sleeve forms a limiting block at an end away from the driving motor, and the connecting member forms a protrusion at an end close to the driving motor, and the limiting block cooperates with the protrusion to limit the moving stroke of the connecting member.

[0013] Preferably, the driving motor is arranged perpendicular to the set direction, and the adjustable chair back further comprises a driving bevel gear and a transmission bevel gear which are meshed with each other for transmission, the driving bevel gear is fixedly arranged on the output shaft of the driving motor, and the transmission bevel gear is fixedly arranged on the transmission screw.

[0014] Preferably, the adjustable chair back further comprises a mounting seat fixedly disposed on the connecting frame, the mounting seat forming a mounting cavity with an opening, the driving motor being positioned in the mounting cavity, the transmission screw extending out of the mounting cavity from the opening, and the limiting sleeve being fixed at the opening of the mounting cavity.

[0015] Preferably, the adjustable chair back further includes a connecting sleeve fixedly arranged at the opening of the mounting cavity, the connecting sleeve being arranged outside the limiting sleeve and the two being fixedly connected; the adjustable chair back further includes a circuit board fixedly arranged on the connecting sleeve, the circuit board being electrically connected to the driving motor located in the mounting cavity through the opening so as to transmit a control signal to the driving motor.

[0016] Preferably, the mounting seat comprises a first half shell and a second half shell that are detachably connected, the first half shell and the second half shell are fixedly installed and form the mounting cavity therebetween; a slot is formed on the connecting sleeve, and the first half shell and / or the second half shell are formed with an insert plate that matches the slot, and the connecting sleeve is fixed to the mounting seat by inserting the insert plate into the slot.

[0017] In addition, to achieve the above purpose, the utility model also adopts the following technical solutions:

[0018] A seat, comprising an adjustable seat back as described in any one of the above technical solutions.

[0019] Preferably, the seat further comprises a control unit, which is electrically connected to the driving mechanism and is used to control the operation of the driving mechanism;

[0020] The seat further comprises a first pressure sensor disposed on the back support, and the control unit is electrically connected to the first pressure sensor, so that when the first pressure value of the back support obtained by the first pressure sensor does not meet the set pressure value, the control unit controls the driving mechanism to drive the back support to move until the first pressure value meets the set pressure value;

[0021] And / or, the seat further comprises a hand controller, and the hand controller is electrically connected to the control unit so that the operation of the driving mechanism can be controlled by the hand controller.

[0022] Preferably, the seat also includes a seat surface or a seat cushion and a second pressure sensor arranged on the seat surface or the seat cushion, the control unit is electrically connected to the second pressure sensor and obtains a second pressure value exerted on the seat surface or the seat cushion through the second pressure sensor, the control unit is provided with a pressure threshold, and the first pressure value is collected when the second pressure value reaches the pressure threshold.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The one-piece chair back structure in the prior art is redesigned into a two-part structure of a connecting frame and a back support, and a driving mechanism is arranged on the connecting frame, and the driving mechanism can be used to drive the back support to reciprocate along a set direction. Through the above arrangement, no matter what sitting posture the user adopts or the position relative to the seat cushion is moved, the back support can be driven by the driving mechanism to move so that the back support can maintain support for the user's back, thereby meeting the user's use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of an adjustable backrest for a seat provided in an embodiment of the present application;

[0026] Figure 2 This is an exploded view of the adjustable chair back;

[0027] Figure 3 This is an exploded view of the adjustable chair back from another perspective;

[0028] Figure 4 Schematic diagram of the drive mechanism and back support structure Figure 1 ;

[0029] Figure 5 Schematic diagram of the drive mechanism and back support structure Figure 2 ;

[0030] Figure 6 It is a schematic diagram of the assembly of the limiting sleeve and the connecting member;

[0031] Figure 7 It is an exploded view of the connecting sleeve and the limiting sleeve;

[0032] Figure 8 for Figure 2 A magnified schematic diagram of part A;

[0033] Figure 9 It is a schematic diagram of the assembly of the mounting seat and the connecting sleeve.

[0034] Among them, 1. connecting frame; 2. driving motor; 20. active bevel gear; 3. transmission screw; 30. transmission bevel gear; 4. nut sleeve; 5. connecting member; 50. slider; 51. bump; 6. limit sleeve; 60. slide groove; 61. limit block; 62. first connecting hole; 7. connecting sleeve; 70. slot; 71. circuit board; 72. second connecting hole; 8. mounting seat; 80. first half shell; 81. second half shell; 82. opening; 83. plug-in board; 9. back support. DETAILED DESCRIPTION

[0035] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] This embodiment provides an adjustable backrest for a seat, such as Figure 1 , Figure 2 andFigure 3 As shown in the figure, the adjustable chair back comprises a connecting frame 1, a driving mechanism and a back support 9. The connecting frame 1 is used to be installed with the base of the chair, the driving mechanism is arranged on the connecting frame 1, and the back support 9 is arranged at the output end of the driving mechanism. It is easy to understand that the back support 9 can be used to support the back of the user. The driving mechanism is used to drive the back support 9 to reciprocate along a set direction.

[0039] The adjustable chair back provided in this embodiment changes the integrated chair back structure in the prior art into a two-part structure of a connecting frame 1 and a back support 9. At the same time, a driving mechanism is arranged on the connecting frame 1, and the back support 9 can be driven to move back and forth along a set direction by the driving mechanism. Through the above arrangement, no matter what sitting posture the user adopts or the position of the relative seat cushion is moved, the back support 9 can be driven by the driving mechanism to move so that the back support 9 can maintain the support for the user's back, thereby meeting the user's use needs.

[0040] The driving mechanism in this embodiment includes a driving motor 2 and a screw-nut transmission mechanism. The driving motor 2 is connected to the back support 9 through the screw-nut transmission mechanism and drives the back support 9 to reciprocate along the set direction. The screw-nut transmission mechanism can not only realize torque transmission, but also use its self-locking ability to ensure that the back support 9 can remain motionless after reaching the expected position. Specifically, the screw-nut transmission mechanism in this embodiment includes a transmission screw 3, a nut sleeve 4 and a connecting member 5. The transmission screw 3 is connected to the output shaft of the driving motor 2 and is driven by the driving motor 2 to rotate. The set direction described in this embodiment is also the axial direction of the transmission screw 3. The nut sleeve 4 is threadedly coupled with the transmission screw 3, and the connecting member 5 is fixedly connected to the nut sleeve 4 and the back support 9 respectively. When the driving motor 2 is working, it can drive the transmission screw 3 to rotate, thereby driving the nut sleeve 4 and the connecting member 5 fixedly connected to the nut sleeve 4 to move, and drive the back support 9 to move through the connecting member 5.

[0041] Of course, in order to make the nut sleeve 4 only reciprocate along the set direction and not rotate along with the transmission screw 3, the adjustable chair back provided in this embodiment also includes a limit sleeve 6 fixedly arranged on the connecting frame 1, and the limit sleeve 6 is sleeved on the outside of the connecting member 5 and the two are slidably matched along the set direction. That is, the connecting member 5 is limited by the limit sleeve 6, so that the connecting member 5 can only slide along the set direction and cannot rotate.

[0042] In other optional embodiments, a linear drive such as an electric push rod can also be selected as a driving mechanism, and the back support 9 can be directly pushed to move back and forth in a straight line through the linear drive. However, the design of the driving mechanism provided by this embodiment has the following advantages: since the back support 9 is driven to move by a screw nut transmission mechanism, the moving distance of the back support 9 can be controlled by accurately controlling the number of rotations of the driving motor 2, thereby improving the control accuracy of the moving distance of the back support 9, and the back support 9 can stay at any position on its moving stroke. In this way, the user can accurately adjust the back support 9 to the desired position according to his own needs.

[0043] like Figure 4 and Figure 5 As shown in Figure 4 The figure shows the state where the back support 9 is closest to the connecting frame 1 along the set direction. Figure 5 The figure shows the state where the back support 9 is farthest from the connecting frame 1 along the set direction. In addition, the drive motor 2 in this embodiment is arranged perpendicular to the set direction, and the adjustable chair back also includes an active bevel gear 20 and a transmission bevel gear 30 that mesh with each other for transmission. The active bevel gear 20 is fixedly arranged on the output shaft of the drive motor 2, and the transmission bevel gear 30 is fixedly arranged on the transmission screw 3. Through the above arrangement, the length direction of the drive motor 2 can be arranged perpendicular to the set direction, so that the space occupied by the drive motor 2 along the set direction can be reduced. It is easy to understand that reducing the space occupied by the drive motor 2 along the set direction can reduce the overall design size of the adjustable chair back along the set direction, which is more beautiful. On this basis, the drive motor 2 can also select a motor with slightly larger power to obtain greater power. Through the cooperation of the active bevel gear 20 and the transmission bevel gear 30, on the one hand, the transmission steering can be achieved, and on the other hand, the transmission torque can be increased through the transmission ratio design.

[0044] As mentioned above, the limiting sleeve 6 in this embodiment is slidably matched with the connecting member 5. Specifically, Figure 6 As shown in FIG. 1 , in this embodiment, a slider 50 is formed on the connecting member 5, and a slide groove 60 is provided on the inner wall of the limiting sleeve 6. The connecting member 5 is slidably arranged in the slide groove 60 through the slider 50. Figure 7 As shown in the figure, the inner wall of the limit sleeve 6 forms a limit block 61 at the end away from the drive motor 2, and the connecting member 5 forms a protrusion 51 at the end close to the drive motor 2. The limit block 61 cooperates with the protrusion 51 to limit the moving stroke of the connecting member 5.

[0045] Through the above structural design, the connecting member 5 can stably slide relative to the limiting sleeve 6. Figure 4 When the connecting member 5 is at the middle position, the connecting member 5 will interfere with the end of the transmission screw 3, thereby limiting the connecting member 5 from moving further toward the connecting frame 1; when the connecting member 5 moves to the middle position, the connecting member 5 will interfere with the end of the transmission screw 3, thereby limiting the connecting member 5 from moving further toward the connecting frame 1;Figure 5 When the connecting member 5 is at the middle position, the connecting member 5 will interfere with the limiting block 61 through the protrusion 51, thereby limiting the connecting member 5 from moving further away from the connecting frame 1.

[0046] The connecting member 5 and the limiting sleeve 6 in this embodiment are both roughly rectangular, and are made of plastic material, wherein the limiting sleeve 6 is made of POM material, which has good wear resistance and self-lubricating properties, and can reduce friction and abnormal noise between components. The connecting member 5 and the nut sleeve 4 can be assembled into one body using a metal insert injection molding process. Alternatively, in an optional embodiment, the connecting member 5 can also be designed as a split shell structure, and after the nut sleeve 4 is set in the split shell structure, the split shell structure is fixedly installed using screws or tight-fitting pins, which can also achieve fixed installation of the nut sleeve 4 and the connecting member 5.

[0047] Figure 1 The skeleton structure of the back support 9 in this embodiment is shown in the figure, and an elastic material can be set on the outside of the skeleton structure of the back support 9 for wrapping. The skeleton structure of the back support 9 can be made of hard plastic material or metal material such as stainless steel. The back support 9 and the connecting member 5 can be fastened together by screws or pins. Of course, in some optional embodiments, the back support 9 can also be configured to be hinged on the connecting member 5, so that the user can adjust the angle of the back support 9 relative to the connecting frame 1 by manual adjustment, so that the back support 9 can be better adapted to different users.

[0048] like Figure 2 and Figure 3 As shown in , in order to facilitate the assembly of the drive motor 2, the adjustable chair back provided in this embodiment also includes a mounting seat 8 fixedly arranged on the connecting frame 1. The mounting seat 8 is formed with a mounting cavity having an opening 82, the drive motor 2 is positioned in the mounting cavity, the transmission screw 3 extends out of the mounting cavity from the opening 82, and the limiting sleeve 6 is fixed at the opening 82 of the mounting cavity. It is easy to understand that a limiting rib that matches the outer contour of the drive motor 2 can be formed on the inner wall of the mounting cavity, and the drive motor 2 is positioned by using the limiting rib. A groove can be formed on the connecting frame 1, the mounting seat 8 is assembled in the groove, and then the mounting seat 8 is locked and fixed to the connecting frame 1 using screws.

[0049] Further, such as Figure 7As shown in , the adjustable chair back provided in this embodiment also includes a connecting sleeve 7 fixedly arranged at the opening 82 of the mounting cavity, and the connecting sleeve 7 is sleeved outside the limiting sleeve 6 and the two are fixedly connected. That is, the limiting sleeve 6 is fixedly connected to the mounting seat 8 through the connecting sleeve 7. Specifically, a first connecting hole 62 is provided on the bottom wall of the limiting sleeve 6, and a second connecting hole 72 is provided on the bottom wall of the connecting sleeve 7. The positions of the first connecting hole 62 and the second connecting hole 72 correspond to each other, and screws are used to pass through the first connecting hole 62 and the second connecting hole 72 to lock and fix the limiting sleeve 6 and the connecting sleeve 7. As mentioned above, the limiting sleeve 6 provided can prevent abnormal friction noise between the connecting member 5 and the limiting sleeve 6, and between the connecting sleeve 7 and the limiting sleeve 6. In addition, combined with Figure 2 and Figure 8 As shown in , in order to facilitate the control of the drive motor 2, the adjustable chair back provided in this embodiment further includes a circuit board 71, and the connection sleeve 7 is also provided to facilitate the arrangement of the circuit board 71. Specifically, the circuit board 71 is fixed to the connection sleeve 7, and at the same time, the circuit board 71 can be electrically connected to the drive motor 2 located in the installation cavity through the opening 82 to transmit a control signal to the drive motor 2. The control of the drive motor 2 will be described in detail later.

[0050] like Figure 9 As shown in , the mounting seat 8 in this embodiment includes a first half shell 80 and a second half shell 81 that are detachably connected. The first half shell 80 and the second half shell 81 are fixedly installed and form a mounting cavity therebetween. A slot 70 is formed on the connecting sleeve 7, and a plug-in plate 83 adapted to the slot 70 is formed on the first half shell 80 and the second half shell 81. The connecting sleeve 7 is fixed to the mounting seat 8 by inserting the plug-in plate 83 into the slot 70. Of course, in other optional embodiments, the plug-in plate 83 may be provided only on one of the first half shell 80 and the second half shell 81. The split design of the mounting seat 8 into the first half shell 80 and the second half shell 81 facilitates the assembly of the mounting seat 8 with the drive motor 2 and the connecting sleeve 7.

[0051] As mentioned above, the adjustable backrest can be applied to a seat, and the adjustable backrest can be installed on the seat base through the connecting frame 1. The seat can be provided with a control unit electrically connected to the drive mechanism and used to control the operation of the drive mechanism. Specifically, the control unit can be electrically connected to the drive motor 2 through the aforementioned electric control board to achieve transmission of control signals.

[0052] In an optional control scheme, a hand controller can be provided for the seat, and the hand controller is electrically connected to the control unit, and the user can operate the hand controller to control the operation of the drive mechanism. For example, the "forward" and "backward" buttons are directly marked on the hand controller. After the user presses the "forward" button, the drive motor 2 is controlled to rotate forward, and the corresponding drive back support 9 moves forward along the set direction (that is, moves in the direction of the face of the user sitting on the seat); after the user presses the "backward" button, the drive motor 2 is controlled to reverse, and the corresponding drive back support 9 moves backward along the set direction. This scheme is a user manual operation control scheme.

[0053] Alternatively, a first pressure sensor may be provided for the seat, and the first pressure sensor may be provided on the back support 9, and the force exerted by the user on the back support 9 may be detected by the first pressure sensor. The control unit is electrically connected to the first pressure sensor and obtains the first pressure value exerted on the back support 9 through the first pressure sensor, and the control unit can control the driving mechanism to work according to the first pressure value after being triggered, so that the back support 9 can apply pressure to the user's back with the set pressure value. Specifically, a preset pressure value may be set and stored in the control unit in advance (it may be set at the factory, or it may be manually input by the user according to his / her own preference; the preset pressure value may be a fixed value, or it may be a plurality of different range values ​​distributed in gears), and when the first pressure value collected by the first pressure sensor is less than the preset pressure value, the control unit will automatically control the driving motor 2 to rotate forward through the driving mechanism, so that the back support 9 moves forward, and the pressure applied to the user's back is increased, until the first pressure value collected by the first pressure sensor reaches the preset pressure value, and the control unit controls the driving motor 2 to stop working. This scheme is an automatic control scheme of the control unit.

[0054] Furthermore, the chair also includes a seat cushion and a second pressure sensor arranged on the seat cushion (of course, if there is no seat cushion, the second pressure sensor can also be directly installed on the seat surface), and the control unit is electrically connected to the second pressure sensor and obtains the second pressure value of the seat cushion through the second pressure sensor. The second pressure sensor can be used to determine whether a user is sitting on the seat cushion. The control unit is provided with a pressure threshold, and the first pressure value is collected when the second pressure value reaches the pressure threshold. That is, when the control unit determines that a user is sitting on the seat cushion based on the second pressure value detected by the second pressure sensor, the control unit will be triggered to receive the first pressure value collected by the first pressure sensor, and compare it with the set pressure value, and then execute the above-mentioned automatic control scheme, that is, the control unit will control the drive motor to work according to the first pressure value, so as to realize the automatic support of the user's back by the back support until the first pressure value meets the set pressure value.

[0055] In other optional implementations, the triggering of the control unit may also be achieved through other solutions. For example, the aforementioned hand controller may be provided at the same time, and an "automatic back-chasing" button may be provided directly on the hand controller. When the user presses the "automatic back-chasing" button, the control unit will be triggered, and then the control unit will execute the automatic control solution, that is, the control unit will control the driving motor to work according to the first pressure value, so as to realize the automatic support of the back support for the user's back.

[0056] The above two control schemes for the driving motor 2 can be applied to the seat by selecting one of them, or both of them can be applied to the seat.

[0057] In other embodiments, a set pressure value associated with the first pressure value and a pressure threshold associated with the second pressure value may be input into the control unit through a hand controller.

[0058] Finally, it should be noted that the above-mentioned implementation modes are only optional embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An adjustable backrest for a seat, characterized in that: The adjustable chair back comprises: A connecting frame, which is used to be installed with the base of the seat; a driving mechanism, which is disposed on the connecting frame; and A back support, which is arranged at the output end of the driving mechanism, and is used to support the back of the user; Wherein, the driving mechanism is used to drive the back support to move back and forth along a set direction.

2. The adjustable chair back according to claim 1, characterized in that: The driving mechanism comprises a driving motor and a screw-nut transmission mechanism. The driving motor is connected to the back support through the screw-nut transmission mechanism and drives the back support to reciprocate along a set direction.

3. The adjustable chair back according to claim 2, characterized in that: The screw-nut transmission mechanism comprises a transmission screw, a nut sleeve and a connecting member, wherein the transmission screw is connected to the output shaft of the driving motor and is driven to rotate by the driving motor, the nut sleeve is threadedly matched with the transmission screw, and the connecting member is fixedly connected to the nut sleeve and the back support respectively; The adjustable chair back also includes a limiting sleeve fixedly arranged on the connecting frame, the limiting sleeve is arranged on the outside of the connecting component and the two are slidably matched along the set direction.

4. The adjustable chair back according to claim 3, characterized in that: The inner wall of the limiting sleeve forms a limiting block at an end away from the driving motor, and the connecting member forms a protrusion at an end close to the driving motor. The limiting block cooperates with the protrusion to limit the moving stroke of the connecting member.

5. The adjustable chair back according to claim 3, characterized in that: The driving motor is arranged perpendicular to the set direction, and the adjustable chair back further comprises a driving bevel gear and a transmission bevel gear which are meshed with each other for transmission, the driving bevel gear is fixedly arranged on the output shaft of the driving motor, and the transmission bevel gear is fixedly arranged on the transmission screw.

6. The adjustable chair back according to claim 5, characterized in that: The adjustable chair back also includes a mounting seat fixedly arranged on the connecting frame, the mounting seat forms a mounting cavity with an opening, the drive motor is positioned in the mounting cavity, the transmission screw extends out of the mounting cavity from the opening, and the limit sleeve is fixed at the opening of the mounting cavity.

7. The adjustable chair back according to claim 6, characterized in that: The adjustable chair back further comprises a connecting sleeve fixedly arranged at the opening of the mounting cavity, the connecting sleeve being arranged outside the limiting sleeve and the two being fixedly connected; The adjustable chair back further comprises a circuit board fixedly arranged on the connecting sleeve, and the circuit board is electrically connected to the driving motor located in the mounting cavity through the opening so as to transmit a control signal to the driving motor.

8. The adjustable chair back according to claim 7, characterized in that: The mounting seat comprises a first half shell and a second half shell which are detachably connected, the first half shell and the second half shell are fixedly mounted and the mounting cavity is formed therebetween; A slot is formed on the connecting sleeve, and a plug plate matched with the slot is formed on the first half shell and / or the second half shell. The connecting sleeve is fixed to the mounting seat by inserting the plug plate into the slot.

9. A seat, characterized in that: Comprising an adjustable chair back as claimed in any one of claims 1 to 8.

10. The seat according to claim 9, characterized in that The seat further comprises a control unit, which is electrically connected to the drive mechanism and is used to control the operation of the drive mechanism; The seat further comprises a first pressure sensor disposed on the back support, and the control unit is electrically connected to the first pressure sensor, so that when the first pressure value of the back support obtained by the first pressure sensor does not meet the set pressure value, the control unit controls the driving mechanism to drive the back support to move until the first pressure value meets the set pressure value; And / or, the seat further comprises a hand controller, and the hand controller is electrically connected to the control unit so that the driving mechanism can be controlled to operate via the hand controller.

11. The seat according to claim 10, characterized in that The seat also includes a seat surface or a seat cushion and a second pressure sensor arranged on the seat surface or the seat cushion. The control unit is electrically connected to the second pressure sensor and obtains a second pressure value exerted on the seat surface or the seat cushion through the second pressure sensor. The control unit is provided with a pressure threshold. When the second pressure value reaches the pressure threshold, the first pressure value is collected.

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