Lumbar support recline angle adjustment device and seat

Abstract

The application discloses a lumbar support inclination angle adjusting device and a seat, which comprises a lumbar support unit and a mounting seat, wherein the lumbar support unit is connected to the mounting seat in a rotating manner; the lumbar support unit comprises a movable piece at the back side, the movable piece is in an arc-shaped structure with a middle part being bent backward, the left and right ends of the mounting seat are both bent forward to form mounting parts, the movable piece is located between the mounting parts at the two sides, and the left and right sides of the movable piece are respectively hinged to the mounting parts at the corresponding sides, so that the movable piece makes a circular motion relative to the mounting seat with the rotation of the lumbar support unit; a locking mechanism is arranged between the movable piece and the mounting seat, the locking mechanism comprises a locking pin and a plurality of locking holes, the locking pin is movably connected to one of the movable piece and the mounting seat, and the plurality of locking holes are arranged on the other one of the movable piece and the mounting seat along the movement direction of the movable piece; when the locking pin is clamped into the locking hole, the movable piece and the mounting seat are relatively fixed, the lumbar support unit is fixed at the current inclination angle; and when the locking pin is separated from the locking hole, the lumbar support unit can be rotated again.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a lumbar support tilt angle adjustment device and a seat. Background Technology

[0002] Adjustable backrests have become a standard feature on office chairs in the current market. These chairs not only support users in a normal sitting position but also allow the backrest to recline, enabling users to lie back and rest, making them very popular in the office environment. Furthermore, to enhance the seating experience, these chairs often include a lumbar support in the backrest, which supports the curved shape of the lower back and effectively relieves lower back fatigue.

[0003] However, from an ergonomic perspective, the human back curve is S-shaped when sitting, and roughly straight when lying down. This means that for a chair to provide better support, the backrest's support surface curve needs to conform to the user's back curve. However, in existing office chairs, the lumbar support is directly connected to the backrest. During backrest tilt adjustments, the backrest and lumbar support maintain the same angle, resulting in a gap between the user's lower back and the backrest when the chair is reclined, creating an uncomfortable feeling of emptiness in the lower back.

[0004] To address the aforementioned issues, the inventors aim to provide a seat where the lumbar support and backrest move independently. This means that when the backrest rotates backward, the lumbar support rotates and moves relative to the backrest, allowing it to extend further forward relative to the backrest when the seat is tilted back. This better adapts to changes in the human lumbar curve and eliminates the feeling of an unsupported lower back. However, this solution has the following drawback: because the lumbar support and backrest move independently, while the seat base fixes the backrest's tilt angle, the lumbar support's tilt angle is not fixed. The lumbar support can still move relative to the backrest, leaving room for improvement in the seat's stability.

[0005] Therefore, how to provide a device that can fix the tilt angle of the lumbar support has become the main problem that needs to be solved. Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a lumbar support tilt angle adjustment device and a seat. The lumbar support unit is hinged to the mounting parts on both sides of the mounting base by an arc-shaped movable part on the rear side, so that the rotation operation of the movable part relative to the mounting base is relatively smooth and stable. A locking mechanism is provided between the movable part and the mounting base. The locking or unlocking operation between the lumbar support unit and the mounting base is controlled by sliding and adjusting the locking pin to engage or disengage from the locking hole. This not only allows the lumbar support unit to be fixed at multiple tilt angles, but also allows the seat to be stably maintained in the current state, providing a stable support effect for the user. Furthermore, the tilt angle adjustment operation of the lumbar support unit is very simple.

[0007] The effect of this utility model is achieved as follows: In a first aspect, this application provides a lumbar support tilt angle adjustment device, including a lumbar support unit and a mounting base. The lumbar support unit is rotatably connected to the mounting base. The lumbar support unit includes a rear movable member, which is an arc-shaped structure that bends backward in the middle. Both ends of the mounting base are bent forward to form mounting portions. The movable member is located between the mounting portions on both sides, and each side of the movable member is hinged to the corresponding mounting portion, so that the movable member moves in a circular motion relative to the mounting base as the lumbar support unit rotates. A locking mechanism is provided between the movable member and the mounting base. The locking mechanism includes a locking pin and multiple locking holes. The locking pin is movably connected to one of the movable member and the mounting base, and the multiple locking holes are opened in the other of the movable member and the mounting base along the movement direction of the movable member. When the locking pin is engaged in the locking hole, the movable member and the mounting base are relatively fixed, and the lumbar support unit is fixed at the current tilt angle. When the locking pin is disengaged from the locking hole, the lumbar support unit can rotate again.

[0008] Furthermore, a movable part is formed by a protrusion in the middle of the rear side of the movable component, and an arc-shaped movable groove is formed by a recess in the front end face of the mounting base. When the movable component rotates relative to the mounting base, the movable part slides along the movable groove. Multiple locking holes are provided on the movable part, and a locking pin passes through laterally and slides to the side wall of the movable groove. This improves the connection strength between the movable component and the mounting base, making the rotation adjustment operation of the lumbar support unit more stable and facilitating the user to control the locking pin to lock or unlock the movable component, thus simplifying operation.

[0009] Furthermore, the locking mechanism also includes an adjustment switch and a torsion spring. The adjustment switch is rotatably connected to the mounting base, one arm of the torsion spring is connected to the adjustment switch, and the other arm is connected to the locking pin. When the adjustment switch rotates, it drives the torsion spring to rotate synchronously, thereby causing the locking pin to slide horizontally to engage or disengage from the lock hole. This design not only has a simple structure and low manufacturing cost, but also makes the tilt angle adjustment of the lumbar support unit easier to operate.

[0010] Furthermore, one side of the mounting base has a recessed mounting cavity, within which a torsion spring is located. A locking pin passes through the mounting cavity and connects to one arm of the torsion spring. The bottom of the mounting cavity has an open, arc-shaped clearance opening. An adjustment switch is rotatably connected to the bottom of the mounting base, and the adjustment switch includes an adjustment part that passes through the clearance opening and connects to the other arm of the torsion spring. This design allows for a tighter fit between the mounting base and the locking mechanism, making the movement of the torsion spring and locking pin less susceptible to interference from other components, resulting in better connection stability. Furthermore, the mounting cavity and its internal locking mechanism are concealed between the lumbar support unit and the mounting base, minimizing their exposure and contributing to a cleaner and more aesthetically pleasing appearance of the seat.

[0011] Furthermore, a limiting collar is also engaged on the clearance opening. The inner wall of the limiting collar has a wavy indentation, and the indentation on the inner wall of the limiting collar forms a limiting zone. When the adjustment switch is rotated, the adjustment part engages with multiple limiting zones in sequence. The adjustment part can be fixed in multiple positions during the adjustment process and is not easily rotated under the action of external force, preventing the adjustment switch from driving the locking pin to move and affecting the use and adjustment operation of the seat, thus improving stability.

[0012] Furthermore, movable support members are rotatably connected to the outer sides of the mounting portions on both the left and right sides. These movable support members are configured to support the lumbar support unit. The movable members are hinged between the mounting portions on the left and right sides, and the two movable support members are fixedly connected to the left and right sides of the movable member, respectively, so that the two movable support members and the movable member rotate synchronously. This results in high connection strength and stability between the lumbar support unit and the mounting base. Moreover, by connecting the movable support members on both sides through the movable members, the movable support members on both sides always rotate at the same angle, resulting in better stability of the tilt angle adjustment operation of the lumbar support unit.

[0013] Furthermore, the lumbar support unit includes a front lumbar support body, with rearwardly extending positioning portions on both sides of the lumbar support body. Each positioning portion has a recessed positioning groove extending in the front-to-back direction. The movable support member includes a front spherical positioning protrusion, which is movably connected to the positioning portion via the positioning groove. The lumbar support body can move relative to the movable support member in multiple directions. This ensures the connection strength and stability between the lumbar support unit and the mounting base, and also allows the lumbar support body to move to a position that better fits the user's waist, providing a more comfortable support effect.

[0014] Furthermore, the front end face of the mounting base forms an arc-shaped support surface, and the moving part is also a corresponding arc-shaped rod, ensuring that the moving part remains in contact with the support surface during rotation. This further enhances the connection strength between the moving part and the mounting base, resulting in better stability of the lumbar support unit's tilt angle adjustment operation.

[0015] Secondly, this application provides a seat, including a seat unit, a backrest unit, and a lumbar support tilt angle adjustment device. The backrest unit and the seat unit are rotatably arranged relative to each other. The bottom of the mounting base is fixed to the seat unit. The lumbar support unit includes a front lumbar support body and a rear panel. The rear panel is hinged to the mounting base and has elastic deformation capability. When the lumbar support unit is leaned against, the rear panel rotates backward under pressure and undergoes elastic deformation. The lumbar support body has the function of adapting to changes in the user's waist, and the lumbar support body applies more elastic support to the user's waist with the help of the return elasticity of the rear panel. This not only makes the rotation adjustment operation of the lumbar support unit simpler and smoother, but also allows the lumbar support unit to provide more comfortable elastic support.

[0016] Furthermore, the backrest unit and the rear panel are connected by a linkage. The front end of the linkage is hinged to the rear panel, and the rear end is hinged to the backrest unit. When the backrest unit rotates backward, the linkage is driven to move backward by the backrest unit, and the linkage pulls the rear panel backward, thereby further driving the rear panel to rotate backward and generate elastic deformation. By setting up the linkage, the rear panel can move synchronously with the backrest unit, making the operation of the lumbar support unit, backrest unit, and seat unit more stable and smooth.

[0017] The lumbar support tilt angle adjustment device and seat provided in this application have a mounting base connected to the backrest unit or seat unit. The lumbar support unit and backrest unit are independently rotatable relative to the seat unit, so that the rotation angle and position of the lumbar support unit and backrest unit relative to the seat unit differ at different tilt angles of the backrest unit. During the backrest unit's recline, the lumbar support unit tends to push forward relative to the backrest unit, thereby compensating for the gap between the user's lower back and the backrest unit's support surface when reclining. The lumbar support unit better conforms to the user's lower back, preventing a feeling of emptiness in the lower back and providing a more comfortable support experience.

[0018] Furthermore, the lumbar support unit is hinged to the mounting parts on both sides of the mounting base via an arc-shaped movable part on the rear side, making the rotation of the movable part relative to the mounting base smoother and more stable. A locking mechanism is provided between the movable part and the mounting base. By sliding and adjusting the locking pin to engage or disengage from the locking hole, the movable part can be locked or unlocked, thereby controlling the locking or unlocking operation between the lumbar support unit and the mounting base. This not only allows the lumbar support unit to be fixed at multiple tilt angles, but also ensures that the seat can be stably maintained in the current state, providing stable support for the user. Moreover, the tilt angle adjustment operation of the lumbar support unit is very simple. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A three-dimensional structural diagram of the lumbar support unit provided in the embodiments of this application; Figure 2 This is a schematic diagram of the connection structure between the lumbar support unit and the mounting base provided in an embodiment of this application; Figure 3 This is a schematic diagram of the connection structure between the mounting base and the rear plate provided in an embodiment of this application; Figure 4 This is a schematic diagram of the connection structure between the moving part and the mounting base provided in an embodiment of this application; Figure 5 This is a schematic diagram of the connection structure between the regulating switch and the mounting base provided in an embodiment of this application; Figure 6A schematic diagram of the connection structure between the lumbar support unit, the seat unit, and the backrest unit provided in an embodiment of this application; Figure 7 A cross-sectional structural diagram of a seat in an upright sitting state provided in an embodiment of this application; Figure 8 A cross-sectional structural diagram of the seat in a pitching state provided in an embodiment of this application; Figure 9 This is a schematic diagram of the rear structure of the seat provided in an embodiment of this application; Figure 10 This is a three-dimensional structural diagram of the seat provided in an embodiment of this application.

[0020] The reference numerals in the attached drawings are as follows: 1-Mounting base, 101-Supporting surface, 110-Moving groove, 120-Mounting cavity, 121-Allowing opening, 130-Limiting collar, 131-Limiting area, 140-Mounting part, 141-Through hole, 2-Moving part, 210-Moving part, 211-Lock hole, 220-Fixing hole, 3-Locking pin, 4-Adjusting switch, 410-Adjusting part, 5-Torsion spring, 6-Moving support part, 610-Positioning protrusion, 620-Fixing part, 7-Lumbar support body, 7a-Lumbar support part, 7b-Lumbar clamping part, 710-Positioning part, 711-Positioning groove, 8-Back plate, 9-Seat unit, 10-Backrest unit, 11-Linkage part. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0022] Please refer to the attached document. Figure 1-10This application provides a lumbar support tilt angle adjustment device, including a lumbar support unit and a mounting base 1. The lumbar support unit is rotatably connected to the mounting base 1. The lumbar support unit includes a rear movable member 2, which is an arc-shaped structure that bends backward in the middle. Both ends of the mounting base 1 are bent forward to form mounting portions 140. The movable member 2 is located between the mounting portions 140 on both sides, and each side of the movable member 2 is hinged to the corresponding mounting portion 140, so that the movable member 2 moves in a circular motion relative to the mounting base 1 as the lumbar support unit rotates. A locking mechanism is provided between the movable member 2 and the mounting base 1. The locking mechanism includes a locking pin 3 and multiple locking holes 211. The locking pin 3 is movably connected to one of the movable member 2 and the mounting base 1, and the multiple locking holes 211 are opened in the other of the movable member 2 and the mounting base 1 along the movement direction of the movable member 2. When the locking pin 3 is engaged in the locking hole 211, the movable member 2 and the mounting base 1 are relatively fixed, and the lumbar support unit is fixed at the current tilt angle. When the locking pin 3 is disengaged from the locking hole 211, the lumbar support unit can rotate again.

[0023] In this embodiment, the mounting base 1 is connected to the backrest unit 10 or the seat unit 9, and the lumbar support unit and the backrest unit 10 are independently rotatable relative to the seat unit 9. This allows the lumbar support unit and the backrest unit 10 to have different rotation angles and positions relative to the seat unit 9 at different tilt angles of the backrest unit 10. During the backward tilt of the backrest unit 10, the lumbar support unit tends to push forward more relative to the backrest unit 10, thereby bridging the gap between the user's lower back and the support surface of the backrest unit 10 when lying down. The lumbar support unit can better conform to the user's lower back, preventing a feeling of emptiness in the lower back and providing a more comfortable support experience.

[0024] Furthermore, the movable part 2, which is an arc shape on the rear side of the lumbar support unit, is hinged between the mounting portions 140 on both sides of the mounting base 1, making the rotation of the movable part 2 relative to the mounting base 1 more stable and smooth. Moreover, a locking mechanism is provided between the movable part 2 and the mounting base 1. By sliding the locking pin 3 into or out of the locking hole 211, the movable part 2 can be locked or unlocked, thereby controlling the locking or unlocking operation between the lumbar support unit and the mounting base 1. This not only allows the lumbar support unit to be fixed at multiple tilt angles, but also ensures that the seat can be stably maintained in the current state, providing a stable support effect for the user. In addition, the tilt angle adjustment operation of the lumbar support unit is very simple.

[0025] Preferably, please refer to the appendix. Figure 7-8The seat has a switchable upright sitting state and a reclining state. In the upright sitting state, the backrest unit 10 rotates forward to a vertical position to support the user sitting upright. In the reclining state, the backrest unit 10 reclines backward to support the user lying down. Therefore, the locking mechanism has two locking holes 211. When the seat is in the upright sitting or reclining state, the locking pin 3 engages with the corresponding locking hole 211, thereby ensuring that the entire seat can be stably maintained in the current state. Of course, in other embodiments of this application, the number of locking holes 211 in the locking mechanism can also be three, four, five, etc.

[0026] Please refer to the attached document. Figure 3-4 In some embodiments of this application, the movable part 210 is formed by protruding from the middle of the rear side of the movable part 2, and the front end face of the mounting base 1 is recessed to form an arc-shaped movable groove 110. When the movable part 2 rotates relative to the mounting base 1, the movable part 210 slides along the movable groove 110. Multiple locking holes 211 are provided on the movable part 210, and the locking pin 3 is transversely inserted and slidably connected to the side wall of the movable groove 110.

[0027] In this embodiment, the movable part 2 slides into the movable slot 110 on the mounting base 1 via the movable part 210 on the rear side, which improves the connection strength between the movable part 2 and the mounting base 1, resulting in better stability of the rotation adjustment operation of the lumbar support unit. Furthermore, by setting the locking pin 3 on the outer mounting base 1, it is convenient for the user to control the locking pin 3 to lock or unlock the movable part 2, making the operation simpler.

[0028] Of course, in other embodiments of this application, the locking pin 3 can also be movably connected to the movable part 2, and multiple locking holes 211 can be opened on the mounting base 1.

[0029] Please refer to the attached document. Figure 3-5 In some embodiments of this application, the locking mechanism further includes an adjusting switch 4 and a torsion spring 5. The adjusting switch 4 is rotatably connected to the mounting base 1. One arm of the torsion spring 5 is connected to the adjusting switch 4, and the other arm is connected to the locking pin 3. When the adjusting switch 4 rotates, it drives the torsion spring 5 to rotate synchronously, thereby driving the locking pin 3 to slide in the horizontal direction to engage or disengage from the lock hole 211.

[0030] In this embodiment, the user can turn the adjustment switch 4 on the outside to drive the locking pin 3 into or out of the lock hole 211, thereby locking or unlocking the lumbar support unit. This not only has a simple structure and low manufacturing cost, but also makes the tilt angle adjustment of the lumbar support unit easier.

[0031] Please refer to the attached document. Figure 3-5In some embodiments of this application, a mounting cavity 120 is formed by a recess on one of the left and right sides of the mounting base 1. The torsion spring 5 is located in the mounting cavity 120. The locking pin 3 passes through the mounting cavity 120 and is connected to one side of the torsion spring 5. The bottom of the mounting cavity 120 is hollowed out to form an arc-shaped clearance opening 121. The adjustment switch 4 is rotatably connected to the bottom of the mounting base 1. The adjustment switch 4 includes an adjustment part 410, which passes through the clearance opening 121 and is connected to the other side of the torsion spring 5.

[0032] In this embodiment, by opening a mounting cavity 120 on the mounting base 1 to accommodate the torsion spring 5 and the locking pin 3, the mounting base 1 and the locking mechanism are more tightly fitted, the movement of the torsion spring 5 and the locking pin 3 is less affected by other components, the connection stability is better, and the mounting cavity 120 and the locking mechanism inside are hidden between the lumbar support unit and the mounting base 1, and are not easily exposed, thus making the seat look cleaner and more beautiful.

[0033] Please refer to the attached document. Figure 3-5 In some embodiments of this application, a limiting collar 130 is also engaged on the clearance opening 121. The inner sidewall of the limiting collar 130 is wavy and recessed. The recessed position of the inner sidewall of the limiting collar 130 forms a limiting area 131. When the adjusting switch 4 is rotated, the adjusting part 410 engages with multiple limiting areas 131 in sequence.

[0034] In this embodiment, by setting a limiting collar 130, the adjustment part 410 can be fixed in multiple positions during the adjustment process. Thus, whether using the seat or adjusting the lumbar support, the adjustment switch 4 is not easy to rotate under the action of external force, avoiding the adjustment switch 4 from driving the locking pin 3 to move and affecting the use and adjustment operation of the seat, and thus improving stability.

[0035] Please refer to the attached document. Figure 1-2 In some embodiments of this application, movable support members 6 are rotatably connected to the outer sides of the mounting portions 140 on both the left and right sides. The movable support members 6 are configured to support the lumbar support unit. The movable member 2 is hinged between the mounting portions 140 on both the left and right sides, and the two movable support members 6 are respectively fixedly connected to the left and right sides of the movable member 2, so that the two movable support members 6 and the movable member 2 rotate synchronously.

[0036] In this embodiment, the lumbar support unit is supported by two movable support members 6, which makes the connection strength and stability between the lumbar support unit and the mounting base 1 higher. Furthermore, the movable support members 6 on both sides are connected by the movable member 2, so that the movable support members 6 on both sides always rotate at the same angle, thereby supporting the lumbar support unit to rotate more smoothly and making the tilt angle adjustment operation of the lumbar support unit more stable.

[0037] Preferably, the movable support member 6 has a protruding fixing part 620, and the left and right sides of the movable member 2 have corresponding recessed fixing holes 220. The fixing part 620 has an irregular structure, and the fixing hole 220 is also a corresponding irregular hole. The mounting part 140 has a hollowed-out through hole 141. The fixing part 620 passes through the through hole 141 and is inserted into the fixing hole 220, so that the movable support member 6 cannot rotate relative to the movable member 2.

[0038] Please refer to the attached document. Figure 1-2 In some embodiments of this application, the lumbar support unit includes a lumbar support body 7 on the front side. The left and right sides of the lumbar support body 7 are provided with rearwardly extending positioning portions 710. The positioning portions 710 are recessed and formed with positioning grooves 711 extending in the front-rear direction. The movable support member 6 includes a front spherical positioning protrusion 610. The positioning protrusion 610 is movably connected to the positioning portion 710 through the positioning groove 711. The lumbar support body 7 can move in multiple directions relative to the movable support member 6.

[0039] In this embodiment, by setting a spherical positioning protrusion 610 and a positioning groove 711 for engaging, the positioning protrusion 610 can stably engage with the positioning groove 711 regardless of whether the lumbar support body 7 slides back and forth, rotates up and down, or deforms. This ensures the connection strength and stability between the lumbar support unit and the mounting base 1, and also allows the lumbar support body 7 to move to a position that fits the user's waist more closely, providing a more comfortable support effect.

[0040] The lumbar support body 7 is a split structure, including a central lumbar support 7a and two symmetrical lumbar clamping parts 7b. The two lumbar clamping parts 7b are rotatably positioned relative to the lumbar support 7a. When the lumbar support 7a moves backward due to the support of the waist, the two lumbar clamping parts 7b are driven by the lumbar support 7a to simultaneously clamp the user's waist inward, thus providing a more comfortable waist-hugging feel. Each lumbar clamping part 7b has a rearwardly extending positioning part 710 on its rear side. When the lumbar clamping part 7b rotates, the positioning part 710 moves relative to the positioning protrusion 610. The positioning protrusion 610 is always engaged in the positioning groove 711, thus making the waist-hugging movement of the lumbar clamping part 7b more stable and smooth.

[0041] Please refer to the attached document. Figure 3-4 In some embodiments of this application, the front end face of the mounting base 1 forms an arc-shaped support surface 101, and the movable part 2 is also a corresponding arc-shaped rod. The movable part 2 always fits against the support surface 101 during rotation.

[0042] In this embodiment, when the lumbar support unit rotates, the movable part 2 moves in an arc relative to the support surface 101. By setting the support surface 101 as an arc-shaped surface and the movable part 2 as an arc-shaped rod, the movable part 2 always fits against the support surface 101 during rotation, thereby further improving the connection strength between the movable part 2 and the mounting base 1, and making the tilt angle adjustment operation of the lumbar support unit more stable.

[0043] Please refer to the attached document. Figure 5-10 This application embodiment also provides a seat, including a seat unit 9, a backrest unit 10, and a lumbar support tilt angle adjustment device. The backrest unit 10 and the seat unit 9 are rotatably arranged relative to each other. The bottom of the mounting base 1 is fixed to the seat unit 9. The lumbar support unit includes a lumbar support body 7 on the front side and a rear plate 8 on the rear side. The rear plate 8 is hinged to the mounting base 1 and has elastic deformation capability. When the lumbar support unit is leaned against, the rear plate 8 rotates backward under pressure and generates elastic deformation.

[0044] In this embodiment, the rear plate 8 has elastic deformation capability. When the lumbar support unit is leaned against, it compresses the rear plate 8, causing elastic deformation. This allows the lumbar support body 7 to rotate further rearward to a position that conforms to the curve of the user's waist. In other words, the lumbar support body 7 has the function of adapting to changes in the user's waist. Moreover, the lumbar support body 7 applies more elastic support to the user's waist with the help of the restoring elasticity of the rear plate 8. This not only makes the rotation adjustment operation of the lumbar support unit simpler and smoother, but also allows the lumbar support unit to provide more comfortable elastic support.

[0045] Please refer to the attached document. Figure 7-8 In some embodiments of this application, the backrest unit 10 and the rear plate 8 are connected by a linkage 11. The front end of the linkage 11 is hinged to the rear plate 8, and the rear end of the linkage 11 is hinged to the backrest unit 10. When the backrest unit 10 rotates backward, the linkage 11 is driven to move backward by the backrest unit 10, and the linkage 11 pulls the rear plate 8 backward, thereby further driving the rear plate 8 to rotate backward and generate elastic deformation.

[0046] In this embodiment, a linkage 11 is provided between the backrest unit 10 and the rear panel 8. When the backrest unit 10 tilts back, it drives the linkage 11 to move backward, thereby causing the rear panel 8 to rotate backward and undergo elastic deformation. Conversely, when the backrest unit 10 rotates forward to return to a vertical position, the linkage 11 moves forward, thereby pushing the rear panel 8 forward and promoting its forward rotation and return to its original position. Thus, by providing the linkage 11, the rear panel 8 can move synchronously with the backrest unit 10, making the operation between the lumbar support unit, the backrest unit 10, and the seat unit 9 more stable and smooth.

[0047] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. 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 indicated technical features. Thus, a feature defined with "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 three or more.

[0048] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A lumbar support tilt angle adjustment device, characterized in that, The lumbar support unit includes a lumbar support unit and a mounting base (1). The lumbar support unit is rotatably connected to the mounting base (1). The lumbar support unit includes a rear movable member (2). The movable member (2) is an arc-shaped structure that bends backward in the middle. Both ends of the mounting base (1) are bent forward to form mounting portions (140). The movable member (2) is located between the mounting portions (140) on both sides, and each side of the movable member (2) is hinged to the corresponding mounting portion (140), so that the movable member (2) moves in a circular motion relative to the mounting base (1) as the lumbar support unit rotates. The movable member (2) and the mounting base (1) are connected to the mounting base (1). A locking mechanism is provided between the mounting base (1). The locking mechanism includes a locking pin (3) and multiple locking holes (211). The locking pin (3) is movably connected to one of the movable part (2) and the mounting base (1). Multiple locking holes (211) are opened in the other of the movable part (2) and the mounting base (1) along the movement direction of the movable part (2). When the locking pin (3) is engaged in the locking hole (211), the movable part (2) and the mounting base (1) are relatively fixed, and the waist support unit is fixed at the current tilt angle. When the locking pin (3) is disengaged from the locking hole (211), the waist support unit can rotate again.

2. The lumbar support tilt angle adjustment device according to claim 1, characterized in that, The movable part (2) has a movable part (210) protruding from the middle of its rear side. The front end face of the mounting base (1) has an arc-shaped movable groove (110) recessed. When the movable part (2) rotates relative to the mounting base (1), the movable part (210) slides along the movable groove (110). The movable part (210) has multiple locking holes (211). The locking pin (3) passes through laterally and slides to the side wall of the movable groove (110).

3. The lumbar support tilt angle adjustment device according to claim 2, characterized in that, The locking mechanism also includes an adjustment switch (4) and a torsion spring (5). The adjustment switch (4) is rotatably connected to the mounting base (1). One arm of the torsion spring (5) is connected to the adjustment switch (4), and the other arm is connected to the locking pin (3). When the adjustment switch (4) rotates, it drives the torsion spring (5) to rotate synchronously, thereby driving the locking pin (3) to slide in the horizontal direction to engage or disengage from the lock hole (211).

4. The lumbar support tilt angle adjustment device according to claim 3, characterized in that, The mounting base (1) has a recessed mounting cavity (120) on one side of its left and right sides. The torsion spring (5) is located in the mounting cavity (120). The locking pin (3) passes through the mounting cavity (120) and is connected to one side of the torsion spring (5). The bottom of the mounting cavity (120) is hollowed out to form an arc-shaped clearance opening (121). The adjustment switch (4) is rotatably connected to the bottom of the mounting base (1). The adjustment switch (4) includes an adjustment part (410). The adjustment part (410) passes through the clearance opening (121) and is connected to the other side of the torsion spring (5).

5. The lumbar support tilt angle adjustment device according to claim 4, characterized in that, A limiting collar (130) is also engaged on the clearance opening (121). The inner wall of the limiting collar (130) is wavy and recessed. The recessed position of the inner wall of the limiting collar (130) forms a limiting area (131). When the adjusting switch (4) is rotated, the adjusting part (410) engages with multiple limiting areas (131) in sequence.

6. The lumbar support tilt angle adjustment device according to claim 1, characterized in that, The outer sides of the mounting portions (140) on both the left and right sides are rotatably connected to movable support members (6). The movable support members (6) are configured to support the waist support unit. The movable member (2) is hinged between the mounting portions (140) on both the left and right sides, and the two movable support members (6) on the left and right sides are respectively fixedly connected to the left and right sides of the movable member (2), so that the two movable support members (6) and the movable member (2) rotate synchronously.

7. The lumbar support tilt angle adjustment device according to claim 6, characterized in that, The lumbar support unit includes a lumbar support body (7) on the front side. The lumbar support body (7) has a positioning part (710) extending backward on both the left and right sides. The positioning part (710) has a positioning groove (711) extending in the front-back direction. The movable support member (6) includes a spherical positioning protrusion (610) on the front side. The positioning protrusion (610) is movably connected to the positioning part (710) through the positioning groove (711). The lumbar support body (7) can move in multiple directions relative to the movable support member (6).

8. The lumbar support tilt angle adjustment device according to claim 1, characterized in that, The front end face of the mounting base (1) forms an arc-shaped support surface (101), and the movable part (2) is also a corresponding arc-shaped rod. The movable part (2) always fits against the support surface (101) during rotation.

9. A type of seat, characterized in that, The device includes a seat unit (9), a backrest unit (10), and a lumbar support tilt angle adjustment device as described in any one of claims 1-8. The backrest unit (10) and the seat unit (9) are rotatably arranged relative to each other. The bottom of the mounting base (1) is fixed to the seat unit (9). The lumbar support unit includes a lumbar support body (7) on the front side and a rear plate (8) on the rear side. The rear plate (8) is hinged to the mounting base (1) and has elastic deformation capability. When the lumbar support unit is leaned against, the rear plate (8) rotates backward under pressure and generates elastic deformation.

10. The seat according to claim 9, characterized in that, The backrest unit (10) and the rear plate (8) are connected by a linkage (11). The front end of the linkage (11) is hinged to the rear plate (8), and the rear end of the linkage (11) is hinged to the backrest unit (10). When the backrest unit (10) rotates backward, the linkage (11) is driven to move backward by the backrest unit (10), and the linkage (11) pulls the rear plate (8) backward, thereby further driving the rear plate (8) to rotate backward and generate elastic deformation.

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