Backrest device and lumbar support chair

Abstract

The application provides a backrest device and a waist support chair, the backrest device comprising a chair body and a backrest assembly; the chair body comprising a first support part and a second support part, the second support part being formed with a first plate body and a second plate body, the first plate body and the second plate body being connected in a circular arc transition; a connecting seat being detachably connected to the first plate body; the connecting seat being provided with a first accommodating groove and a second accommodating groove, a power supply being accommodated in the first accommodating groove and connected to the connecting seat; the second accommodating groove being arranged on the front side wall of the connecting seat, a massage assembly being accommodated in the second accommodating groove; a flexible outer cover being detachably sleeved on the connecting seat and wrapping the connecting seat, the power supply and the massage assembly; so that the backrest assembly is detachably connected to the chair body through the connecting seat, thereby facilitating the connection or disconnection of the backrest assembly to the chair body, and facilitating the replacement of the backrest assembly; meanwhile, the backrest assembly integrates a massage effect, thereby improving the replacement convenience of the backrest device.

Description

Technical Field

[0001] This utility model relates to the technical field of lumbar support chairs, and more particularly to a backrest device and a lumbar support chair. Background Technology

[0002] With the development of technology, lumbar support chairs have been applied to people's lives. These chairs are used for seats, tabletops, desktops, or sofas placed externally. Their function is limited to physical support, supporting the lower back through contact. The backrest is an integral part of the lumbar support chair. In existing technology, the current backrest system includes the chair body and a backrest assembly. The backrest assembly is fixed to the chair body and cannot be replaced. It merely serves as a support for the user's back, resulting in poor ease of replacement for the existing backrest assembly. Utility Model Content

[0003] The purpose of this utility model is to provide a backrest device and a lumbar support chair. The chair body is used as a seat, tabletop, desktop, or sofa placed externally. The chair body includes a first support part and a second support part, which are integrated with the first support part. The chair body is made of plastic. The second support part is connected to the first support part and extends upward in a fluid manner. The width of the second support part gradually decreases in the upward direction. The second support part forms a first plate and a second plate, which are connected by an arc transition. The backrest assembly includes a connecting seat, a power supply, a massage component, and a flexible cover. The connecting seat is detachably connected to the first plate and is located on the side of the first plate facing the user's back. The connecting seat can be positioned relative to... The first plate is positioned; the connecting seat has a first receiving groove and a second receiving groove, the power supply is received in the first receiving groove and connected to the connecting seat; the second receiving groove is located on the front side wall of the connecting seat, and the massage component is received in the second receiving groove; the flexible sleeve is detachably fitted onto the connecting seat and wraps the connecting seat, the power supply and the massage component; the flexible sleeve has a through hole, which is used to expose the connecting part of the connecting seat that connects to the first plate, so that the backrest component can be detachably connected to the main body of the chair through the connecting seat, thereby facilitating the connection or detachment of the backrest component from the main body of the chair, making it convenient for the backrest component to be replaced. At the same time, the backrest component integrates a massage effect, avoiding the inability to replace and massage the backrest component, and improving the convenience of replacing the backrest device.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a backrest device applied to a lumbar support chair, the backrest device comprising: A seating chair body is used for placing a chair seat, tabletop, desktop, or sofa on the outside; the seating chair body includes a first support part and a second support part, the second support part and the first support part being an integrated structure; the seating chair body is made of plastic; the second support part is connected to the first support part and extends upward in a fluid manner; the width of the second support part gradually decreases in the upward direction; the second support part is formed with a first plate and a second plate, the first plate and the second plate being connected by an arc transition; The backrest assembly includes a connector, a power supply, a massage component, and a flexible cover. The connector is detachably connected to the first plate and is located on the side of the first plate facing the user's back. The connector is positionally adjustable relative to the first plate. The connector has a first receiving slot and a second receiving slot. The power supply is received in the first receiving slot and connected to the connector. The second receiving slot is located on the front sidewall of the connector, and the massage component is received in the second receiving slot. The flexible cover is detachably fitted onto the connector and covers the connector, the power supply, and the massage component. The flexible cover has a through hole for exposing the connection portion of the connector that connects to the first plate.

[0005] Optionally, the second plate is disposed on the outer periphery of the first plate; a first arc transition portion is provided between the second plate and the first plate, and the first arc transition portion is arranged along the outer contour of the first plate; The first arc transition portion protrudes rearward along the second plate or the first plate to reinforce the second plate and the first plate.

[0006] Optionally, the second plate, the first plate, and the first arc transition portion are an integrated structure; The second plate is bent forward from the outer contour of the first plate; the cross-section of the second plate is arranged in an arc or an inclined plane.

[0007] Optionally, the second plate is provided with a plurality of reinforcing parts, which are arranged sequentially along the direction of the second plate toward the first plate and reinforce the second plate. The first plate is located near the middle of the first support portion, and the first plate and the first support portion are connected by an arc transition; the second plate is located near both sides of the first support portion, and the second plate and the first support portion are connected by an arc transition.

[0008] Optionally, when a user sits on the backrest device, the user's buttocks press against the first support part, and the user's waist or back can contact the flexible cover and be massaged by the massage component; The second support portion supports the connecting seat, the massage component, and the flexible outer cover; the second support portion and the first support portion are connected by an arc transition.

[0009] Optionally, the first plate is provided with elongated holes, which are arranged along the vertical direction; The connecting seat has a connecting part on the side wall facing the first plate, and the connecting part has a threaded hole that can be arranged relative to the elongated hole. The elongated hole is used for the connector to pass through, and the connector is provided with a stud portion, which is threaded to the threaded hole, so that the connector is connected to the first plate.

[0010] Optionally, the first plate body is further provided with a plurality of rotating holes, which are disposed on the rear side of the elongated hole and communicate with the elongated hole; The connector is provided with a rotating part, which is rotatably connected to the rotating hole and positioned to connect to the rotating hole; the connector rotates as the rotating part rotates relative to the rotating hole, and the stud part connects to the threaded hole as the connector rotates.

[0011] Optionally, the rotating hole is a circular hole, and the rotating part is a cylindrical part; the plurality of rotating holes are connected along the vertical direction; The connector is provided with a rotating cap for user operation; the rotating cap, the rotating part, and the stud part are integrated into one structure, and the connector is a plastic or metal part.

[0012] Optionally, the connecting part is provided with a plurality of annular reinforcing ribs, the plurality of annular reinforcing ribs are arranged in concentric circles relative to the threaded hole, and the plurality of annular reinforcing ribs are connected to each other; The second plate is provided with a lifting hole, which is located at the top of the second plate and is used for the user to lift it with their hand.

[0013] To achieve the above objectives, this utility model provides the following technical solution: a lumbar support chair, including the aforementioned backrest device; the massage component of the backrest device includes a movable seat, a massage module, and a red light module; the movable seat supports the massage module and the red light module, and the massage module and the red light module are distributed at different positions on the movable seat; The movable seat is movably connected to the connecting seat; the massage module moves relative to the connecting seat under the drive of the movable seat, and moves along the vertical direction of the flexible outer sleeve to act on the front sidewall of the flexible outer sleeve; the massage module has multiple rotatable massage parts, which rotate along their own axes; the red light module is disposed on one side of the massage module and exposed on the outside of the massage parts; the rotation range corresponding to the massage parts is staggered with the light emission range corresponding to the red light module; The red light module is connected to the movable base and moves along the vertical direction of the flexible jacket as the movable base moves, so that the front sidewall of the flexible jacket has a red light area; the red light output by the red light module is directed toward the front sidewall of the flexible jacket. The movable seat is connected to a power motor, a rotating module, and a moving module. The moving module is movably connected to the connecting seat. The rotating module is connected to the massage part and drives the massage part to rotate. The rotating module and the moving module are both connected to the same power motor and work under the drive of the power motor.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides a backrest device and a lumbar support chair. The chair body is used as a seat, tabletop, desktop, or sofa placed externally. The chair body includes a first support part and a second support part, which are integrated with the first support part. The chair body is made of plastic. The second support part is connected to the first support part and extends upward in a fluid manner. The width of the second support part gradually decreases in the upward direction. The second support part forms a first plate and a second plate, which are connected by an arc transition. The backrest assembly includes a connecting seat, a power supply, a massage component, and a flexible cover. The connecting seat is detachably connected to the first plate and is located on the side of the first plate facing the user's back. The connecting seat can be positioned relative to the first plate. The body is positioned for adjustment; the connecting seat has a first receiving groove and a second receiving groove, the power supply is received in the first receiving groove and connected to the connecting seat; the second receiving groove is located on the front side wall of the connecting seat, and the massage component is received in the second receiving groove; the flexible sleeve is detachably fitted onto the connecting seat and wraps the connecting seat, the power supply and the massage component; the flexible sleeve has a through hole, which is used to expose the connecting part of the connecting seat that connects to the first plate body, so that the backrest component can be detachably connected to the main body of the chair through the connecting seat, thereby facilitating the connection or detachment of the backrest component from the main body of the chair, making it convenient for the backrest component to be replaced. At the same time, the backrest component integrates a massage effect, avoiding the inability to replace and massage the backrest component, and improving the convenience of replacing the backrest device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0017] Figure 1 A schematic diagram of a backrest device according to an embodiment of this application is shown.

[0018] Figure 2 An exploded view of a backrest device according to an embodiment of this application is shown.

[0019] Figure 3 A schematic diagram showing the connection between the seat body and the connecting seat of the backrest device according to an embodiment of this application is shown.

[0020] Figure 4 A schematic diagram of the main body of a chair with a backrest device according to an embodiment of this application is shown.

[0021] Figure 5 A schematic diagram showing the connection between the connecting seat of the backrest device and the massage component according to an embodiment of this application is illustrated.

[0022] Figure 6 A schematic diagram of the connection of the backrest device according to an embodiment of this application is shown.

[0023] Figure label: 100. Backrest device; 10. Main body of the chair; 11. First support part; 12. Second support part; 121. First plate; 121a. Elongated hole; 121b. Rotation hole; 122. Second plate; 122a. Lifting hole; 1221. Reinforcing part; 123. First arc transition part; 20. Backrest assembly; 21. Connector; 21a. First receiving groove; 21b. Second receiving groove; 211. Connecting part; 211a. Threaded hole; 2111. Annular reinforcing rib; 22. Power supply; 23. Massage assembly; 24. Flexible outer sleeve; 24a. Through hole; 25. Connector; 251. Stud part; 252. Rotating part; 253. Screw cap part. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] Please refer to the attached document. Figures 1-6 This application provides a backrest device 100, which is applied to a lumbar support chair and is used to massage the user's back. Different backrest components 20 can be replaced.

[0026] Please refer to the attached document. Figures 1-6 In this embodiment, the backrest device 100 includes a seating chair body 10 and a backrest assembly 20. The seating chair body 10 is used as a seat, tabletop, desktop, or sofa placed externally. The seating chair body 10 includes a first support portion 11 and a second support portion 12, which are integrally formed with the first support portion 11. The seating chair body 10 is made of plastic. The second support portion 12 is connected to the first support portion 11 and extends upward in a fluid manner. The width of the second support portion 12 gradually decreases in the upward direction. The second support portion 12 forms a first plate 121 and a second plate 122, which are connected by an arc transition. The backrest assembly 20 includes a connecting seat 21, a power supply 22, a massage component 23, and a flexible cover 24. The connecting seat 21 is detachably connected to the first plate 121 and is located on the side of the first plate 121 facing the user's back. The connecting seat 21 can be positioned relative to the first plate 121. 21. Position adjustment is performed; the connecting seat 21 is provided with a first receiving groove 21a and a second receiving groove 21b. The power supply 22 is received in the first receiving groove 21a and connected to the connecting seat 21; the second receiving groove 21b is provided on the front side wall of the connecting seat 21, and the massage component 23 is received in the second receiving groove 21b; the flexible sleeve 24 is detachably fitted onto the connecting seat 21 and wraps the connecting seat 21, the power supply 22 and the massage component 23; the flexible sleeve 24 is provided with a through hole 24a, which is used to expose the connecting part 211 in the connecting seat 21 that connects to the first plate 121, so that the backrest component 20 can be detachably connected to the main body of the chair 10 through the connecting seat 21, thereby facilitating the connection or detachment of the backrest component 20 from the main body of the chair 100, making it convenient for the backrest component 20 to be replaced. At the same time, the backrest component 20 integrates a massage effect, avoiding the inability of the backrest component 20 to be replaced and massaged, and improving the replacement convenience of the backrest device 100.

[0027] Please refer to the attached document. Figures 1-6In this embodiment, the seating chair body 10 is used to place the seat, tabletop, desktop, or sofa of an external chair, so that the seating chair body 10 can stably place the seat, tabletop, desktop, or sofa of an external chair; the seating chair body 10 includes a first support part 11 and a second support part 12, the second support part 12 and the first support part 11 are integrated, which improves the connection strength between the second support part 12 and the first support part 11 and ensures the connection stability between the second support part 12 and the first support part 11; the seating chair body 10 is made of plastic, which reduces the overall weight of the backrest device 100.

[0028] The second support portion 12 is connected to the first support portion 11 and extends upward in a fluid manner, so that the second support portion 12 and the first support portion 11 form an L-shape. The contours of the second support portion 12 and the first support portion 11 are adapted to the contours of the user's buttocks and waist when in a sitting position. The width of the second support portion 12 gradually narrows upward so that the second support portion 12 can adapt to the contours of the user's back. The second support portion 12 is formed with a first plate 121 and a second plate 122. The first plate 121 and the second plate 122 are connected by an arc transition. The arc transition connection eliminates the stress concentration points of the traditional right-angle connection, avoids the initiation of cracks between the first plate 121 and the second plate 122, and ensures the strength of the second support portion 12.

[0029] The backrest assembly 20 includes a connecting seat 21, a power supply 22, a massage component 23, and a flexible cover 24. The connecting seat 21 is detachably connected to the first plate 121 and is located on the side of the first plate 121 facing the user's back, so that the connecting seat 21 can be connected to or detached from the first plate 121. The connecting seat 21 can be adjusted in position relative to the first plate 121 so that the connecting seat 21 can adapt to the back of different users. The connecting seat 21 is provided with a first receiving groove 21a and a second receiving groove 21b. The power supply 22 is received in the first receiving groove 21a and connected to the connecting seat 21 so that the power supply 22 is fixed to the connecting seat 21 through the space of the first receiving groove 21a. The second receiving groove 21b is provided on the front side wall of the connecting seat 21, and the massage component 23 is received in the second receiving groove 21b so that the massage component 23 is fixed to the connecting seat 21 through the second receiving groove 21b.

[0030] The flexible cover 24 is detachably fitted onto the connecting seat 21, allowing the flexible cover 24 to be connected to or detached from the connecting seat 21. The flexible cover 24 encloses the connecting seat 21, the power supply 22, and the massage component 23, thereby concealing the connecting seat 21, the power supply 22, and the massage component 23 and improving the aesthetics of the backrest component 20. The flexible cover 24 has a through hole 24a, which exposes the connecting part 211 in the connecting seat 21 that connects to the first plate 121, facilitating the connection between the connecting seat 21 and the first plate 121. This allows the backrest component 20 to be detachably connected to the seating chair body 10 via the connecting seat 21, making it easy for the backrest component 20 to be connected to or detached from the seating chair body 10 and facilitating the replacement of the backrest component 20. At the same time, the backrest component 20 integrates a massage effect, preventing the backrest component 20 from being unable to be replaced and providing massage, and improving the ease of replacement of the backrest device 100.

[0031] Please refer to the attached document. Figure 4 In this embodiment, the second plate 122 is disposed on the outer periphery of the first plate 121; a first arc transition portion 123 is provided between the second plate 122 and the first plate 121, which is arranged along the outer contour of the first plate 121; so that the second plate 122 and the first plate 121 form an arc transition connection structure. The arc transition connection structure eliminates the stress concentration points of the traditional right-angle connection, avoids the initiation of cracks between the first plate 121 and the second plate 122, and the first arc transition portion 123 protrudes backward along the second plate 122 or the first plate 121 to reinforce the second plate 122 and the first plate 121, strengthen the support force of the second plate 122 and the first plate 121, and ensure the support effect of the second plate 122 and the first plate 121 on the user's back.

[0032] Please refer to the attached document. Figure 4 In this embodiment, the second plate 122, the first plate 121, and the first arc transition portion 123 are an integrated structure, which ensures the connection strength between the second plate 122, the first plate 121, and the first arc transition portion 123 and avoids breakage between the second plate 122, the first plate 121, and the first arc transition portion 123.

[0033] The second plate 122 is bent forward from the outer contour of the first plate 121; the cross-section of the second plate 122 is arranged in an arc or an inclined plane to ensure the fit between the user's back and the second plate 122 and the first plate 121.

[0034] Please refer to the attached document. Figure 4In this embodiment of the application, the second plate 122 is provided with a plurality of reinforcing parts 1221, which are arranged sequentially along the direction of the second plate 122 toward the first plate 121 and reinforce the second plate 122; so as to enhance the strength of the second plate 122 through the reinforcement of the plurality of reinforcing parts 1221 and ensure the supporting force of the second plate 122.

[0035] The first plate 121 is located near the middle of the first support part 11, and the first plate 121 and the first support part 11 are connected by an arc transition; the second plate 122 is located near both sides of the first support part 11, and the second plate 122 and the first support part 11 are connected by an arc transition. The arc transition connection structure eliminates the stress concentration point of the traditional right angle connection and avoids the initiation of cracks between the first plate 121 and the first support part 11.

[0036] Please refer to the attached document. Figures 1-4 In this embodiment, when the user sits on the backrest device 100, the user's buttocks press against the first support part 11, and the user's waist or back can contact the flexible cover 24, so that the user's waist or back can flexibly contact the backrest device 100, improving the user's waist or back comfort, and the user's waist or back can be massaged by the massage component 23; so as to achieve a massage effect on the user's waist or back.

[0037] The second support portion 12 supports the connecting seat 21, the massage component 23, and the flexible cover 24, so that the connecting seat 21, the massage component 23, and the flexible cover 24 can be arranged relative to the user's waist or back through the second support portion 12; the second support portion 12 and the first support portion 11 are connected by an arc transition, and the arc transition connection structure eliminates the stress concentration point of the traditional right angle connection and avoids the initiation of cracks between the second support portion 12 and the first support portion 11.

[0038] Please refer to the attached document. Figures 1-4 In embodiment 6, the first plate 121 is provided with an elongated hole 121a, which is arranged along the vertical direction; the connecting seat 21 has a connecting portion 211 on its side wall facing the first plate 121, which is provided with a threaded hole 211a, which can be arranged relative to the elongated hole 121a; the elongated hole 121a is used for the connecting member 25 to pass through, and the connecting member 25 is provided with a stud portion 251, which is threaded to the threaded hole 211a, so that the connecting seat 21 is connected to the first plate 121, so that the connecting member 25 can lock the connecting seat 21 to the first plate 121 through the stud portion 251. When the position of the stud portion 251 relative to the elongated hole 121a is adjusted, the position of the connecting seat 21 relative to the first plate 121 is adjusted as the position of the stud portion 251 relative to the elongated hole 121a is adjusted.

[0039] Please refer to the attached document. Figures 1-4 In this embodiment, the first plate 121 is further provided with a plurality of rotating holes 121b, which are located on the rear side of the elongated hole 121a and communicate with the elongated hole 121a; the connector 25 is provided with a rotating part 252, which is rotatably connected to the rotating hole 121b and positions the rotating hole 121b, ensuring the positional accuracy of the connector 25 relative to the first plate 121 and improving the connection effect of the connector 25 to the connecting part 211; the connector 25 rotates with the rotation of the rotating part 252 relative to the rotating hole 121b, and the stud part 251 connects to the threaded hole 211a with the rotation of the connector 25, so as to realize the locking of the stud part 251 to the connecting seat 21 and the first plate 121.

[0040] Please refer to the attached document. Figures 1-4 In embodiment 6 of this application, the rotating hole 121b is a circular hole, and the rotating part 252 is a cylindrical part; multiple rotating holes 121b are connected along the vertical direction so that the inner contour of the rotating hole 121b can be adapted to the outer contour of the rotating part 252. The connector 25 is provided with a screw cap 253, which is used for user operation; the screw cap 253, the rotating part 252, and the stud part 251 are integrated into a single structure so that the user can operate the screw cap 253 to lock the stud part 251 to the connector 21 and the first plate 121, thereby improving the user's ease of operation of the connector 25. The connector 25 is a plastic part or a metal part.

[0041] Please refer to the attached document. Figures 1-4 In this embodiment of the application, the connecting part 211 is provided with a plurality of annular reinforcing ribs 2111, which are arranged in concentric circles relative to the threaded hole 211a and are connected to each other; this strengthens the strength of the connecting part 211 and ensures the connection strength between the connecting part 211 and the connecting member 25.

[0042] The second plate 122 is provided with a lifting hole 122a, which is located at the top of the second plate 122 and is used for the user to lift it with their hand, so that the user can easily lift the second plate 122 by passing their hand through the lifting hole 122a, making it convenient for the user to move the back support device 100.

[0043] In the second embodiment, a lumbar support chair includes a backrest device 100; the massage component 23 of the backrest device 100 includes a movable seat, a massage module and a red light module; the movable seat supports the massage module and the red light module, and the massage module and the red light module are distributed at different positions of the movable seat to make full use of the position of the movable seat.

[0044] The movable seat is movably connected to the connecting seat 21 to facilitate adjustment of the position of the movable seat relative to the connecting seat 21. The massage module moves relative to the connecting seat 21 under the drive of the movable seat and moves along the up and down direction of the flexible outer sleeve 24 to act on the front side wall of the flexible outer sleeve 24. When the user's waist contacts the front side wall of the flexible outer sleeve 24, the massage module massages different positions of the user's waist or back during the movement, avoiding massaging only one position of the user's waist or back, and ensuring the comprehensive massage of the massage component 23.

[0045] The massage module has multiple rotatable massage parts that rotate along their own axes, enabling movement and rotation of the massage parts. This facilitates multi-directional massage of the user's waist or back, preventing the massage module from being unable to move and improving the massage convenience of the massage component 23. The red light module is located on one side of the massage module and exposed on the outside of the massage parts. The rotation range of the massage parts and the light emission range of the red light module are staggered, so that the massage parts and the red light module can respectively massage and provide red light therapy to different positions of the user's waist or back.

[0046] The red light module is connected to the movable base and moves along the vertical direction of the flexible outer sleeve 24 as the movable base moves, so that the front side wall of the flexible outer sleeve 24 has a red light area; the red light output by the red light module is directed towards the front side wall of the flexible outer sleeve 24; when the user's waist contacts the front side wall of the flexible outer sleeve 24, the red light module performs red light therapy on different positions of the user's waist or back during the movement, avoiding red light therapy on only one position of the user's waist or back, and ensuring the comprehensiveness of the massage component 23.

[0047] The movable base is connected to a power motor, a rotating module, and a moving module. The moving module is movably connected to the connecting base 21 to facilitate adjustment of its position relative to the connecting base 21. The rotating module is connected to the massage unit and drives it to rotate, allowing the massage unit to rotate under the action of the rotating module. Both the rotating module and the moving module are connected to the same power motor and operate under its drive, enabling automated rotation and movement of both. The rotating module rotates via gear meshing. The moving module moves via a combination of gears and a rack.

[0048] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides a backrest device 100 and a lumbar support chair. The chair body 10 is used as a seat, tabletop, desktop, or sofa placed externally. The chair body 10 includes a first support part 11 and a second support part 12, which are integrated with the first support part 11. The chair body 10 is made of plastic. The second support part 12 is connected to the first support part 11 and extends upward in a fluid manner. The width of the second support part 12 gradually decreases in the upward direction. The second support part 12 forms a first plate 121 and a second plate 122, which are connected by an arc transition. The backrest assembly 20 includes a connecting seat 21, a power supply 22, a massage assembly 23, and a flexible cover 24. The connecting seat 21 is detachably connected to the first plate 121 and is located on the side of the first plate 121 facing the user's back. The connecting seat 21 can be positioned relative to the first plate 121. The connecting seat 21 is provided with a first receiving groove 21a and a second receiving groove 21b. The power supply 22 is received in the first receiving groove 21a and connected to the connecting seat 21. The second receiving groove 21b is provided on the front side wall of the connecting seat 21, and the massage component 23 is received in the second receiving groove 21b. The flexible sleeve 24 is detachably fitted onto the connecting seat 21 and wraps the connecting seat 21, the power supply 22 and the massage component 23. The flexible sleeve 24 is provided with a through hole 24a, which is used to expose the connecting part 211 in the connecting seat 21 that connects to the first plate 121, so that the backrest component 20 can be detachably connected to the main body of the chair 10 through the connecting seat 21. This makes it easy for the backrest component 20 to be connected to or detached from the main body of the chair 10, and facilitates the replacement of the backrest component 20. At the same time, the backrest component 20 integrates a massage effect, which avoids the backrest component 20 being unable to be replaced and massaged, and improves the replacement convenience of the backrest device 100.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0050] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0051] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0052] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A backrest device, characterized in that, The backrest device, used in a lumbar support chair, includes: A seating chair body is used for placing a chair seat, tabletop, desktop, or sofa on the outside; the seating chair body includes a first support part and a second support part, the second support part and the first support part being an integrated structure; the seating chair body is made of plastic; the second support part is connected to the first support part and extends upward in a fluid manner; the width of the second support part gradually decreases in the upward direction; the second support part is formed with a first plate and a second plate, the first plate and the second plate being connected by an arc transition; The backrest assembly includes a connector, a power supply, a massage component, and a flexible cover. The connector is detachably connected to the first plate and is located on the side of the first plate facing the user's back. The connector is positionally adjustable relative to the first plate. The connector has a first receiving slot and a second receiving slot. The power supply is received in the first receiving slot and connected to the connector. The second receiving slot is located on the front sidewall of the connector, and the massage component is received in the second receiving slot. The flexible cover is detachably fitted onto the connector and covers the connector, the power supply, and the massage component. The flexible cover has a through hole for exposing the connection portion of the connector that connects to the first plate.

2. The backrest device according to claim 1, characterized in that, The second plate is disposed on the outer periphery of the first plate; a first arc transition portion is provided between the second plate and the first plate, and the first arc transition portion is arranged along the outer contour of the first plate; The first arc transition portion protrudes rearward along the second plate or the first plate to reinforce the second plate and the first plate.

3. The backrest device according to claim 2, characterized in that, The second plate, the first plate, and the first arc transition portion are an integrated structure; The second plate is bent forward from the outer contour of the first plate; the cross-section of the second plate is arranged in an arc or an inclined plane.

4. The backrest device according to claim 2, characterized in that, The second plate is provided with a plurality of reinforcing parts, which are arranged sequentially along the direction of the second plate toward the first plate and reinforce the second plate. The first plate is located near the middle of the first support portion, and the first plate and the first support portion are connected by an arc transition; the second plate is located near both sides of the first support portion, and the second plate and the first support portion are connected by an arc transition.

5. The backrest device according to claim 1, characterized in that, When a user sits on the backrest device, the user's buttocks press against the first support part, and the user's waist or back can contact the flexible cover and be massaged by the massage component. The second support portion supports the connecting seat, the massage component, and the flexible outer cover; the second support portion and the first support portion are connected by an arc transition.

6. The backrest device according to claim 1, characterized in that, The first plate is provided with elongated holes, which are arranged along the vertical direction; The connecting seat has a connecting part on the side wall facing the first plate, and the connecting part has a threaded hole that can be arranged relative to the elongated hole. The elongated hole is used for the connector to pass through, and the connector is provided with a stud portion, which is threaded to the threaded hole, so that the connector is connected to the first plate.

7. The backrest device according to claim 6, characterized in that, The first plate is also provided with a plurality of rotating holes, which are located on the rear side of the elongated hole and communicate with the elongated hole; The connector is provided with a rotating part, which is rotatably connected to the rotating hole and positioned to connect to the rotating hole; the connector rotates as the rotating part rotates relative to the rotating hole, and the stud part connects to the threaded hole as the connector rotates.

8. The backrest device according to claim 7, characterized in that, The rotating hole is a circular hole, and the rotating part is a cylindrical part; the plurality of rotating holes are connected along the vertical direction; The connector is provided with a rotating cap for user operation; the rotating cap, the rotating part, and the stud part are integrated into one structure, and the connector is a plastic or metal part.

9. The backrest device according to claim 6, characterized in that, The connecting part is provided with multiple annular reinforcing ribs, which are arranged concentrically relative to the threaded hole and are connected to each other. The second plate is provided with a lifting hole, which is located at the top of the second plate and is used for the user to lift it with their hand.

10. A lumbar support chair, characterized in that, Includes a backrest device as described in any one of claims 1 to 9; the massage component of the backrest device includes a movable seat, a massage module, and a red light module; the movable seat supports the massage module and the red light module, and the massage module and the red light module are distributed at different positions on the movable seat; The movable seat is movably connected to the connecting seat; The massage module moves relative to the connecting seat under the drive of the movable seat, and moves along the vertical direction of the flexible outer sleeve to act on the front sidewall of the flexible outer sleeve; the massage module has multiple rotatable massage parts, which rotate along their own axis; the red light module is disposed on one side of the massage module and exposed on the outside of the massage parts; the rotation range corresponding to the massage parts and the light emission range corresponding to the red light module are staggered. The red light module is connected to the movable base and moves along the vertical direction of the flexible jacket as the movable base moves, so that the front sidewall of the flexible jacket has a red light area; the red light output by the red light module is directed toward the front sidewall of the flexible jacket. The movable base is connected to a power motor, a rotating module, and a moving module, and the moving module is movably connected to the connecting base; The rotating module is connected to the massage unit and drives the massage unit to rotate; both the rotating module and the moving module are connected to the same power motor and work under the drive of the power motor.

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