Linkage chair back

Abstract

The utility model discloses a linkage chair back, which is assembled on a seat base and comprises a backrest bracket, a movable backrest component, a spring waist rest and an adjustable headrest, the backrest support and the movable backrest assembly are both rotationally connected with the seat base, and a linkage mechanism is arranged between the backrest support and the movable backrest assembly and used for limiting the rotating angle of the movable backrest assembly. The spring waist rest and the adjusting headrest are assembled on the movable backrest assembly; the linkage mechanism limits the rotating angle of the movable backrest assembly, potential safety hazards caused by excessive inclination are prevented, meanwhile, it is guaranteed that good supporting can be provided at different inclination angles, the spring waist rest and the adjusting headrest incline backwards along with rotation of the movable backrest assembly, and the waist and the head of the human body are always supported.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a linkage backrest. Background Art

[0002] At present, many manufacturers have designed a seat back adjustment function for seats, but the conventional seat back adjustment mechanism still has the following problems: Since the seat back adjustment mechanism is located behind the back support member, when the back support member is adjusted backward, the user needs to leave the seat for operation, which is not convenient enough; The whole back support member is installed on the back bracket. During the tilting process of the user, the position of the waist point will move backward as a whole with the backrest assembly, the buttocks are relatively fixed to the seat surface, and the back support member is separated from the human waist, directly forming a suspension gap between the two, resulting in the loss of support for the human waist in the tilted state, and the human spine cannot be effectively supported, leading to many health problems caused by long-term sitting. Summary of the Invention

[0003] In order to overcome the deficiencies in the prior art, a linkage backrest is provided, which can effectively support the human waist and solve the problem that the waist cannot be supported after the backrest is tilted.

[0004] The technical solution of the utility model is as follows: A linkage backrest is assembled on a seat base, and includes a backrest bracket, a movable backrest assembly, a spring lumbar support and an adjustable headrest; both the backrest bracket and the movable backrest assembly are rotatably connected to the seat base, and a linkage mechanism is provided between the backrest bracket and the movable backrest assembly, and the linkage mechanism is used to limit the rotation angle of the movable backrest assembly; The spring lumbar support and the adjustable headrest are assembled on the movable backrest assembly; The linkage mechanism limits the rotation angle of the movable backrest assembly, prevents potential safety hazards caused by excessive tilting, and at the same time ensures good support at different tilting angles. The spring lumbar support and the adjustable headrest tilt backward as the movable backrest assembly rotates, and always maintain the support for the human waist and head.

[0005] Preferably, the movable backrest assembly includes a rotating part and a supporting part which are fixedly connected; The spring lumbar support is assembled at the lower end of the supporting part, and the adjustable headrest is assembled at the upper end of the supporting part. The supporting part serves as a bearing platform for the spring lumbar support and the adjustable headrest, providing stable support for the user's back; The rotating part is used to connect the supporting part and the seat base, and the rotation of the rotating part drives the supporting part to tilt, providing a good user experience for the user.

[0006] Preferably, the linkage mechanism includes a sliding member and a limiting groove; the sliding member is assembled at the upper end of the backrest bracket, the limiting groove is formed on the supporting portion, and the sliding member is fitted into the limiting groove and slides along the length direction of the limiting groove. The linkage mechanism allows the movable backrest assembly to freely adjust the tilt angle within a preset range while maintaining a stable connection with the backrest bracket. The limiting groove provides a clear sliding path for the sliding member, ensuring that the sliding member can move along a predetermined trajectory during adjustment, thus avoiding wobbling or jamming caused by an unclear sliding path.

[0007] Preferably, there are two sliding members, which are symmetrically assembled on the backrest bracket. The symmetrically assembled sliding members can ensure that the backrest bracket remains balanced when stressed, reducing wobbling or tilting caused by uneven unilateral stress, thereby enhancing the stability of the entire seat.

[0008] Preferably, a rotating shaft is provided between the rotating portion and the seat base; the rotating shaft reduces the contact area between the movable backrest assembly and the seat base during rotation, thereby reducing friction and wear, which helps to extend the service life of the seat.

[0009] Preferably, the spring lumbar support includes a fixing member, an elastic device, and an arc-shaped support member; the elastic device is assembled between the fixing member and the arc-shaped support member; the design of the arc-shaped support member conforms to the ergonomic principle and can closely fit the lumbar curve to provide effective support for the waist; the elastic device can automatically adjust the support force according to the stress situation and evenly disperse the lumbar pressure to the entire support surface. This design helps to reduce the burden on the lumbar vertebrae and surrounding muscles and reduce the risk of low back pain and strain.

[0010] Preferably, one side of the fixing member is provided with an installation portion and at least two elastic connection portions, and the two elastic connection portions are symmetrically arranged on both sides of the installation portion. The two elastic connection portions being symmetrically arranged on both sides of the installation portion helps to maintain the balance and stability of the lumbar support system. This design can prevent the lumbar support from tilting or shifting during use and ensure a stable support effect for the user.

[0011] Preferably, a plurality of first fixing grooves are provided on the elastic connection portion, and a plurality of second fixing grooves corresponding to the plurality of first fixing grooves are provided on the arc-shaped support member; both ends of the elastic device are fitted into the first fixing groove and the second fixing groove, making the elastic device more firmly assembled on the spring lumbar support.

[0012] Preferably, in the middle of the end of the fixing member far from the elastic device, there is a connection structure for detachably installing on the supporting portion 32; this facilitates the installation and disassembly of the entire spring lumbar support.

[0013] Preferably, the adjustable headrest is provided with a connection mechanism detachably connected to the supporting portion, and the adjustable headrest is installed through the detachable connection mechanism, making it convenient to remove when not in use.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] A linkage backrest, the structure of this device is simple and compact, easy to manufacture and maintain; it provides stable and reliable angle adjustment and limiting functions, ensuring the comfort and safety of the seat. When the movable backrest assembly adjusts the angle relative to the backrest bracket, the sliding member will slide along the length direction of the limiting groove; through the linkage mechanism, the movable backrest assembly can freely adjust the inclination angle within a preset range, while maintaining a firm connection with the backrest bracket, ensuring that the movable backrest assembly will not tilt excessively, guaranteeing the safety and stability of the seat; and, the spring lumbar support and the adjustable headrest move with the movable backrest assembly, enabling the user's back to be supported at various angles during use.

[0016] Other features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. Description of the Drawings

[0017] The following further describes the utility model with reference to the drawings:

[0018] Figure 1 It is an installation schematic diagram of a linkage backrest of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the backrest bracket of the foundation pit of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the movable backrest assembly of the utility model;

[0021] Figure 4 It is an installation schematic diagram of the fixing member of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the spring lumbar support of the utility model;

[0023] Figure 6 Structural schematic diagram of the fixing member of the utility model;

[0024] Figure 7 Structural schematic diagram of the arc-shaped support member of the utility model;

[0025] Figure 8 Structural schematic diagram of the rotating assembly of the utility model;

[0026] The description of the reference numerals is as follows:

[0027] Seat base 1, backrest support 2, movable backrest assembly 3, spring lumbar support 4, adjustable headrest 5, rotating part 31, supporting part 32, linkage mechanism 6, sliding part 61, rotating shaft 311, limiting groove 62, fixing part 41, elastic device 42, elastic part 421, arc-shaped support part 43, mounting part 411, elastic connecting part 412, first fixing groove 4121, second fixing groove 431, connecting mechanism 51, connecting structure 4111, anti-slip structure 4211, rotating assembly 21. Detailed implementation mode

[0028] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0029] In the following description, terms such as "inner", "outer", "upper", "lower", "left", "right", etc. indicating orientation or position relationship are only for convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0030] As Figure 1 As shown, a linkage backrest is assembled on the seat base 1, and includes a backrest support 2, a movable backrest assembly 3, a spring lumbar support 4 and an adjustable headrest 5; both the backrest support 2 and the movable backrest assembly 3 are rotatably connected to the seat base 1, and the spring lumbar support 4 and the adjustable headrest 5 are assembled on the movable backrest assembly 3; during use, the spring lumbar support 4 and the adjustable headrest 5 can tilt as the movable backrest assembly 3 rotates, and can always maintain support for the user's back; reducing the fatigue and discomfort caused by long-term sitting postures, thereby significantly improving the comfort of the seat. The backrest support 2 is arranged on one side of the movable backrest assembly 3 away from the spring lumbar support 4, and the backrest support 2 ensures a more stable connection between it and the seat base 1, providing sufficient support force for the movable backrest assembly 3. Moreover, by arranging the backrest support 2 on the side away from the spring lumbar support 4, it is more convenient to arrange and install the linkage mechanism 6, thereby ensuring smooth and accurate angle adjustment.

[0031] The movable backrest assembly 3 includes a rotating part 31 and a supporting part 32 which are fixedly connected; the spring lumbar support 4 is assembled at the lower end of the supporting part 32, and the adjustable headrest 5 is assembled at the upper end of the supporting part 32. The rotating part, as the connecting part between the movable backrest assembly 3 and the backrest bracket 2, bears the weight and force of the occupant's back and remains stable during the rotation process. In this embodiment, a rotating shaft 311 is usually provided between the rotating part 31 and the seat base 1; the rotating shaft 311 is a key connecting component between the movable backrest assembly 3 and the seat base 1, which allows the backrest to rotate freely within a certain angle range. This rotation function allows the occupant to adjust the angle of the backrest according to personal needs and comfort, thereby obtaining a better sitting experience.

[0032] Furthermore, the backrest bracket 2 is assembled on the seat base 1 through a rotating component 21, and the rotating component 21 is arranged at one end of the backrest bracket 2. The rotating component 21 is provided with a rotating rod for rotational connection, and a shell is also provided outside the rotating rod to protect the rotating rod to prevent other things from being drawn into the rotating component 21.

[0033] A linkage mechanism 6 is provided between the backrest bracket 2 and the movable backrest assembly 3, and the linkage mechanism 6 is used to limit the rotation angle of the movable backrest assembly 3; the linkage mechanism 6 includes a sliding member 61 and a limiting groove 62; the sliding member 61 is assembled on the upper end of the backrest bracket 2, the limiting groove 62 is provided on the support portion 32, and the sliding member 61 is embedded in the limiting groove 62 and slides along the length direction of the limiting groove 62. When the backrest bracket and the movable backrest assembly are in the original state, the sliding member 61 is located at the upper end of the limiting groove 62.

[0034] Furthermore, two sliding members 61 are provided, which are symmetrically assembled on the backrest bracket 2; the symmetrically assembled sliding members 61 can ensure that the backrest bracket remains balanced when subjected to force, reduce the shaking or tilting phenomenon caused by uneven force on one side, and thus enhance the stability of the entire seat. The symmetrically designed sliding members 61 can maintain consistent sliding resistance and trajectory during the adjustment process, making the adjustment of the backrest bracket smoother and more precise. The user can easily adjust the angle and position of the backrest through the sliding member 61 to meet different sitting posture requirements. Correspondingly, a limiting groove 62 for the sliding connection of the sliding member 61 is provided on the support portion 32. The limiting groove 62 is opened on the side of the support portion 32. The limiting groove 62 provides a clear sliding path for the sliding member 61, ensuring that the sliding member 61 can move along the predetermined trajectory during the adjustment process, thereby avoiding shaking or jamming caused by unclear sliding path.

[0035] Among them, the spring lumbar support 4 includes a fixing member 41, an elastic device 42, and an arc-shaped support member 43; the elastic device 42 is assembled between the fixing member 41 and the arc-shaped support member 43; one side of the fixing member 41 is provided with a mounting portion 411 and at least two elastic connecting portions 412, and the two elastic connecting portions 412 are symmetrically arranged on both sides of the mounting portion 411. A plurality of first fixing grooves 4121 are provided on the elastic connecting portion 412, and a plurality of second fixing grooves 431 corresponding to the plurality of first fixing grooves 4121 are provided on the arc-shaped support member 43; both ends of the elastic device 42 are fitted into the first fixing grooves 4121 and the second fixing grooves 431.

[0036] Among them, the elastic connecting portions 412 are symmetrically distributed on both sides of the mounting portion 411, enhancing the structural strength of the fixing member 41; the first fixing grooves provide connection points for the elastic device 42, and at least two elastic connecting portions 412 also improve the flexibility of the backrest lumbar support. The arc-shaped support member 43 is adjusted by the corresponding elastic devices 42 on the plurality of elastic connecting portions 412, so that the arc-shaped support member 43 has a certain amount of movement space when subjected to pressure, thereby adapting to the back curves and sitting postures of different users.

[0037] In this embodiment, the corresponding settings of the first fixing grooves 4121 and the second fixing grooves 431 enable the elastic device 42 to be accurately positioned between the fixing member 41 and the arc-shaped support member 43, preventing the displacement or distortion of the elastic device 42 during use, thereby ensuring the overall stability of the backrest lumbar support. Moreover, mounting holes are provided in both the first fixing grooves 4121 and the second fixing grooves 431; the elastic device 42 is fixed by screws passing through the mounting holes, improving the stability of the installation and simplifying the installation process.

[0038] The elastic device 42 is a key component connecting the fixing member 41 and the arc-shaped support member 43, and it is responsible for providing the necessary elasticity and cushioning to reduce the pressure on the back caused by long-term sitting postures. In this embodiment, the material of the elastic device 42 is preferably a spring. As a classic elastic element, the spring has excellent elastic recovery ability.

[0039] Anti-slip structures 4211 for fixing the elastic member 421 are provided on the inner side walls of the first fixing grooves 4121 and the second fixing grooves 431; the anti-slip structures 4211 are thread-shaped grooves; the thread-shaped grooves increase the contact area between the inner side walls of the first fixing grooves 4121 and the second fixing grooves 431 and the elastic device 42, and form a plurality of tiny biting points. These biting points can effectively increase the friction force between the two, preventing the elastic device 42 from sliding or shifting due to force during use, thereby ensuring the stability and support effect of the spring lumbar support 4.

[0040] Among them, the installation part 411 is the main part of the fixing member 41 and is used to fix the spring lumbar support 4 on the seat base 1. The design of the installation part 411 should take into account easy installation and disassembly while ensuring stability. In this example, a connection structure 4111 for detachably installing on the support part 32 is provided in the middle of one end of the fixing member 41 away from the elastic device 42.

[0041] Among them, the adjustment headrest 5 is provided with a connection mechanism 51 detachably connected to the support part 32. The connection mechanism 51 allows for quick disassembly and installation between the adjustment headrest 5 and the support part 32, facilitating adjustment by the user according to requirements.

[0042] As described above, only the specific embodiments of the present utility model are provided, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that the present utility model includes but is not limited to the content described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present utility model will be included within the scope of the claims.

Claims

1. A linkage chair back, assembled on a seat base (1), characterized in that: The invention comprises a backrest bracket (2), a movable backrest assembly (3), a spring lumbar support (4) and an adjustable headrest (5); the backrest bracket (2) and the movable backrest assembly (3) are both rotatably connected to a seat base (1); a linkage mechanism (6) is provided between the backrest bracket (2) and the movable backrest assembly (3); the linkage mechanism (6) is used to limit the rotation angle of the movable backrest assembly (3); the spring lumbar support (4) and the adjustable headrest (5) are assembled on the movable backrest assembly (3).

2. The linkage chair back according to claim 1, characterized in that: The movable backrest assembly (3) comprises a rotating portion (31) and a supporting portion (32) which are fixedly connected; a spring waist support (4) is mounted on the lower end of the supporting portion (32), and an adjustable head support (5) is mounted on the upper end of the supporting portion (32).

3. The linkage chair back according to claim 1, characterized in that: The linkage mechanism (6) comprises a sliding member (61) and a limiting groove (62); the sliding member (61) is mounted on the upper end of the backrest bracket (2); the limiting groove (62) is provided on the support portion (32); the sliding member (61) is embedded in the limiting groove (62) and slides along the length direction of the limiting groove (62).

4. The linkage chair back according to claim 3, characterized in that: The sliding members (61) are provided in two pieces and are symmetrically assembled on the backrest bracket (2).

5. The linkage chair back according to claim 2, characterized in that: A rotating shaft (311) is provided between the rotating portion (31) and the seat base (1).

6. The linkage chair back according to claim 1, characterized in that: The spring waist support (4) comprises a fixing member (41), an elastic device (42) and an arc-shaped support member (43); the elastic device (42) is assembled between the fixing member (41) and the arc-shaped support member (43).

7. The linkage chair back according to claim 6, characterized in that: One side of the fixing member (41) is provided with a mounting portion (411) and at least two elastic connecting portions (412), and the two elastic connecting portions (412) are symmetrically arranged on both sides of the mounting portion (411).

8. The linkage chair back according to claim 7, characterized in that: The elastic connection portion (412) is provided with a plurality of first fixing grooves (4121), and the arc-shaped support member (43) is provided with a plurality of second fixing grooves (431) corresponding to the plurality of first fixing grooves (4121); the two ends of the elastic device (42) are embedded in the first fixing grooves (4121) and the second fixing grooves (431).

9. The linkage chair back according to claim 6, characterized in that: A connection structure (4111) for detachably mounting on the support portion (32) is provided at the middle of one end of the fixing member (41) away from the elastic device (42).

10. The linkage chair back according to claim 1, characterized in that: The adjustable headrest (5) is provided with a connection mechanism (51) which is detachably connected to the support portion (32).

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