Recliner and backrest assembly

Abstract

This utility model relates to a lumbar support and backrest assembly, including a lumbar support bracket, a central lumbar support, and two side lumbar supports located beside the central lumbar support. The lumbar support also includes a telescopic hinge mechanism, which is connected to the lumbar support bracket and the side lumbar supports, and / or the telescopic hinge mechanism is connected to the central lumbar support and the side lumbar supports. At least a portion of the telescopic hinge mechanism is hinged to the remaining portion of the telescopic hinge mechanism, and in the arrangement direction of the central lumbar support and the side lumbar supports, either the at least portion or the remaining portion is telescopically and slidably connected to the lumbar support bracket, the side lumbar supports, or the central lumbar support. The advantage is that the telescopic hinge mechanism, through its sliding degree of freedom (telescopic connection) and rotational degree of freedom (hinge), significantly improves the dynamic wrapping of the lumbar support, allowing the side lumbar supports to not only rotate inward to wrap around the waist, but also to slide and extend relative to the central lumbar support along the arrangement direction, thus fitting the waist more closely and providing a more active and better all-around wrapping feel.

Description

Technical Field

[0001] This utility model belongs to the field of office furniture, and in particular relates to a lumbar support and backrest assembly. Background Technology

[0002] The lumbar support of an office chair refers to a support structure or adjustment device located at the lower part of the backrest, specifically designed for the user's lumbar spine area.

[0003] In existing technology, the connection structure between the main and auxiliary lumbar supports of office chairs usually adopts a direct hinge connection. When the lumbar support is compressed by the waist, the hinge mechanism between the main and auxiliary lumbar supports will restrict the stretching movement of the two in the circumference of the user's waist, restrict the relative free stretching and adaptive angle of the two, resulting in poor wrapping of the user's waist by the auxiliary lumbar support. Utility Model Content

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a lumbar support and backrest assembly that can solve the aforementioned technical issues.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The lumbar support includes a lumbar support bracket, a central lumbar support, and two side lumbar supports located beside the central lumbar support. The lumbar support also includes a telescopic hinge mechanism, which is connected to the lumbar support bracket and the side lumbar supports, and / or the telescopic hinge mechanism is connected to the central lumbar support and the side lumbar supports. At least a portion of the telescopic hinge mechanism is hinged to the remaining portion of the telescopic hinge mechanism, and in the arrangement direction of the central lumbar support and the side lumbar supports, either the at least portion or the remaining portion is telescopically and slidably connected to the lumbar support bracket, the side lumbar supports, or the central lumbar support.

[0007] Furthermore, at least a portion of the telescopic hinge mechanism includes a first hinge portion, and the remaining portion of the telescopic hinge mechanism includes a second hinge portion, the first hinge portion and the second hinge portion being hinged to each other, and either the first hinge portion or the second hinge portion being telescopically and slidably connected to the lumbar support bracket or the side lumbar support or the middle lumbar support.

[0008] Furthermore, the telescopic hinge mechanism also includes a sliding connection position and a sliding connection part that are slidably connected to each other. Either the sliding connection position or the sliding connection part is provided in the first hinge part or the second hinge part, and the remaining one is provided in the middle lumbar support, the side lumbar support, or the lumbar support bracket.

[0009] As one embodiment, this application also provides a lumbar support, including a lumbar support bracket, a central lumbar support, and two side lumbar supports located beside the central lumbar support. The lumbar support bracket is hinged to the side lumbar supports. The central lumbar support and the side lumbar supports are respectively connected by a telescopic hinge mechanism. At least a portion of the telescopic hinge mechanism is hinged to the remaining portion of the telescopic hinge mechanism. In the arrangement direction of the central lumbar support and the side lumbar supports, at least a portion of the telescopic hinge mechanism is telescopically and slidably connected to the side lumbar supports, and the remaining portion of the telescopic hinge mechanism is fixed to the central lumbar support.

[0010] As one embodiment, this application also provides a lumbar support, including a lumbar support bracket, a central lumbar support, and two side lumbar supports located beside the central lumbar support. The lumbar support bracket is hinged to the side lumbar supports. The central lumbar support and the side lumbar supports are respectively connected by a telescopic hinge mechanism. At least a portion of the telescopic hinge mechanism is hinged to the remaining portion of the telescopic hinge mechanism. In the arrangement direction of the central lumbar support and the side lumbar supports, the remaining portion of the telescopic hinge mechanism is fixed to the side lumbar supports, and at least a portion of the telescopic hinge mechanism is telescopically slidably connected to the central lumbar support.

[0011] As one embodiment, this application also provides a lumbar support, including a lumbar support bracket, a central lumbar support, and two side lumbar supports located beside the central lumbar support. The lumbar support bracket is hinged to the side lumbar supports. The central lumbar support and the side lumbar supports are respectively connected by a telescopic hinge mechanism, at least a portion of which is hinged to the remaining portion of the telescopic hinge mechanism. In the arrangement direction of the central lumbar support and the side lumbar supports, at least a portion of one telescopic hinge mechanism is fixed to the side lumbar support, and the remaining portion of the telescopic hinge mechanism is telescopically slidably connected to the central lumbar support. At least a portion of the other telescopic hinge mechanism is telescopically slidably connected to the side lumbar support, and the remaining portion of the other telescopic hinge mechanism is fixed to the central lumbar support.

[0012] As one implementation, this application also provides a lumbar support, including a lumbar support bracket, a central lumbar support, and two side lumbar supports located beside the central lumbar support. The lumbar support bracket and the side lumbar supports are respectively connected by a telescopic hinge mechanism. The central lumbar support and the side lumbar supports are hinged together. At least a portion of the telescopic hinge mechanism is hinged to the remaining portion of the telescopic hinge mechanism. In the arrangement direction of the central lumbar support and the side lumbar supports, either the at least portion or the remaining portion is telescopically and slidably connected to the lumbar support bracket, and the remaining portion is fixed to the side lumbar supports.

[0013] Furthermore, an elastic mechanism is provided between the middle lumbar support or the side lumbar support and the lumbar support bracket. The elastic mechanism is a sliding elastic mechanism and there is at least one set of such mechanisms.

[0014] Furthermore, the elastic mechanism includes a first sleeve portion and a second sleeve portion that slide together, and an elastic element is provided in the internal space of the first sleeve portion and the second sleeve portion to reset the intermediate waist support and the side waist support.

[0015] Furthermore, the lumbar support also includes a gear locking mechanism, with several gears of the gear locking mechanism located in the first sleeve portion, and a locking block of the gear locking mechanism located in the second sleeve portion. The locking block is engaged in any one of the gears under the action of a locking spring.

[0016] As one implementation, this application also provides a backrest assembly, the backrest assembly including the lumbar support, and the lumbar support bracket of the lumbar support is integrally formed with the backrest bracket or fixed to the backrest bracket by a detachable structure, and the backrest bracket is also provided with a backrest frame located on the upper side of the lumbar support.

[0017] Compared with existing technologies, the advantages of this application are as follows: The telescopic hinge mechanism of this design significantly improves the dynamic wrapping of the lumbar support system by introducing the synergistic effect of sliding degree of freedom (telescopic connection) and rotational degree of freedom (hinge). It allows the side lumbar supports to not only rotate inward to wrap around, but also slide and extend relative to the middle lumbar support along the arrangement direction, thereby adaptively conforming to the waist, eliminating the support dead angles and abrupt turns caused by traditional rigid hinges, and providing a more proactive and better all-round wrapping feeling. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the assembled lumbar support of this utility model.

[0019] Figure 2 This is a schematic front view of the assembled lumbar support of this utility model.

[0020] Figure 3 for Figure 2 Schematic diagram of cross-section of component AA;

[0021] Figure 4 Two schematic front views of the assembled lumbar support of this utility model;

[0022] Figure 5 for Figure 4 Schematic diagram of cross-section of BB component;

[0023] Figure 6 This is a bottom view of the assembled lumbar support of this utility model.

[0024] Figure 7This is a cross-sectional schematic diagram of the telescopic hinge mechanism component of this utility model.

[0025] Figure 8 This is a front view schematic diagram of the telescopic hinge mechanism component of this utility model;

[0026] Figure 9 This is a three-dimensional schematic diagram of the assembled backrest component of this utility model.

[0027] Figure 10 A side view of the assembled backrest assembly of this utility model is shown in Figure 1.

[0028] Figure 11 This is a front view of the assembled backrest assembly of this utility model.

[0029] Figure 12 This is a three-dimensional schematic diagram of the assembled lumbar support in Example 5;

[0030] Figure 13 This is a schematic cross-sectional view of the components of the telescopic hinge mechanism in Embodiment 5.

[0031] Figure 14 This is a front view schematic diagram of the components of the telescopic hinge mechanism in Embodiment 5.

[0032] In the figure, there are: 1. Lumbar support bracket; 11. Support arm; 2. Middle lumbar support; 3. Side lumbar support; 31. Slide groove; 311. Return spring; 4. Telescopic hinge mechanism; 4. At least part; 41. First hinge part; 411. Slider; 412. Remaining part; 42. Second hinge part; 421. Sliding connection position; 43. Sliding connection part; 44. Elastic mechanism; 5. First sleeve part; 51. Second sleeve part; 52. Elastic element; 53. Gear locking mechanism; 6. Gear; 61. Locking block; 62. Locking spring; 63. Backrest bracket; 7. Backrest frame; 8. Headrest; 9. Detailed Implementation

[0033] The present invention 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 present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] Example 1

[0038] like Figures 1-5 As shown, a lumbar support includes a lumbar support bracket 1, a central lumbar support 2, and two side lumbar supports 3 located beside the central lumbar support 2. The lumbar support bracket 1 and the side lumbar supports 3 are connected by a hinge. Specifically, the lumbar support bracket 1 has the following characteristics: Figure 3The two symmetrically distributed support arms 11 shown are designed in a "U" or "V" shape. The two support arms 11 are hinged to the two side waist supports 3. In this specific embodiment, in the first case, the middle waist support 2 and the side waist supports 3 located on its left and right are connected by telescopic hinge mechanisms 4 respectively. In the second case, the two support arms 11 of the waist support bracket 1 are connected to the side waist supports 3 respectively by telescopic hinge mechanisms 4. At least part 41 of the telescopic hinge mechanism 4 is hinged to the remaining part 42 of the telescopic hinge mechanism 4. In the arrangement direction of the middle waist support 2 and the side waist supports 3, at least part 41 of the telescopic hinge mechanism 4 is telescopically and slidably connected to the side waist supports 3 and / or the remaining part 42 of the telescopic hinge mechanism 4 is telescopically and slidably connected to the middle waist support 2 (in the second case, either at least part 41 and the remaining part 42 are telescopically and slidably connected to the side waist supports 3 or the middle waist support 2).

[0039] Specifically, such as Figures 2-5 The telescopic hinge mechanism 4 shown includes at least a first hinge portion 41, and the remaining portion 42 of the telescopic hinge mechanism 4 includes a second hinge portion 421. The first hinge portion 411 and the second hinge portion 421 are hinged to each other. The first hinge portion 411 is telescopically and slidably connected to the side waist support 3 and / or the second hinge portion 421 is telescopically and slidably connected to the middle waist support 2.

[0040] like Figure 3 , Figure 7 and Figure 8 As shown, the first hinge portion 411, at its end away from the hinge point with the second hinge portion 421, forms a telescopic sliding connection with the side lumbar support 3. Specifically, this end of the first hinge portion 411 is also provided with (or integrally formed with) a sliding connection portion 44, while the side lumbar support 3 is provided with a sliding connection position 43 extending along the arrangement direction of the middle lumbar support 2 and the side lumbar support 3 (i.e., approximately left-right horizontal direction). The sliding connection portion 44 is slidably accommodated within the sliding connection position 43, allowing the first hinge portion 411 to reciprocate linearly (i.e., telescopically) relative to the side lumbar support 3 along this arrangement direction. Various implementation schemes can be designed, where either the sliding connection position 43 or the sliding connection portion 44 is located in the first hinge portion 411 or the second hinge portion 421, and the remaining one is located in the middle lumbar support 2 or the side lumbar support 3. The two hinge portions act as a whole, with their hinged connection responsible for angle adaptation, while their respective (or one of them) sliding connection with the lumbar support component is responsible for telescopic adaptation. This structure allows for greater relative freedom of movement between the central lumbar support 2 and the side lumbar supports 3, enabling a better fit to the dynamic changes of the waist.

[0041] Furthermore, the aforementioned sliding connection position 43 can be any one of a rectangular groove, an elliptical groove, a circular groove, and a trapezoidal groove. In this embodiment, only a rectangular groove sliding connection position 43 is used as an example, but other groove shapes can achieve the same effect and strength.

[0042] When the user's lower back applies pressure backward (towards the seat back), it pushes the central lumbar support 2 to move relative to the lumbar support bracket 1. This movement forces the central lumbar support 2 and the side lumbar supports 3 to swing relative to each other, thereby causing the side lumbar supports 3 on both sides to clamp the user's lower back inward, achieving full-body lumbar support.

[0043] In addition, such as Figure 5 As shown, an elastic mechanism 5 is provided between the central lumbar support 2 or the side lumbar support 3 and the lumbar support bracket 1. The elastic mechanism 5 is a sliding elastic mechanism and there is at least one set. The elastic mechanism 5 includes a first sleeve portion 51 and a second sleeve portion 52 that slide and fit together. An elastic element 53 is provided in the internal space of the first sleeve portion 51 and the second sleeve portion 52 to reset the central lumbar support 2 and the side lumbar support 3.

[0044] Preferably, to provide balanced support and adapt to the support needs of different parts, this embodiment, for example, provides the following between the intermediate lumbar support 2 and the lumbar support bracket 1: Figure 5 One or more sets of sliding elastic mechanisms 5 are shown. For example... Figure 5 As shown, the first sleeve portion 51 is fixedly connected to or integrally formed on the lumbar support bracket 1, and the second sleeve portion 52 is slidably sleeved with the first sleeve portion 51. Specifically, either the first sleeve portion 51 or the second sleeve portion 52 is sleeve-shaped (outer cylinder), and the other is a rod-shaped or cylindrical structure (inner rod / inner cylinder) that can be inserted into the sleeve and slide along its axial direction, forming a sliding pair. The second sleeve portion 52 is correspondingly fixedly connected to or integrally formed on the intermediate lumbar support 2. An elastic element 53 is disposed in the internal space formed by the first sleeve portion 51 and the second sleeve portion 52. The elastic element 53 is a compression spring, with one end abutting against the inner wall of the first sleeve portion 51 and the other end abutting against the inner wall of the second sleeve portion 52.

[0045] At the same time, such as Figure 6 As shown, the lumbar support also includes a gear locking mechanism 6. Several gear positions 61 of the gear locking mechanism 6 are provided on the outer surface of the first sleeve part 51. The locking block 62 of the gear locking mechanism 6 is provided on the second sleeve part 52. The locking block 62 is locked in any one of the gear positions 61 under the action of the locking spring 63.

[0046] When the user adjusts the lumbar support position, the first socket 51 and the second socket 52 slide relative to each other. During the sliding process, once the locking block 62 slides to a position aligned with a certain gear 61, the locking spring 63 will immediately push the locking block 62 into that gear 61.

[0047] After the locking block 62 engages with the gear position 61, the locking spring 63 effectively prevents relative sliding between the first sleeve part 51 and the second sleeve part 52 in the locking direction. At this time, the length of the sliding elastic mechanism 5 is fixed at the position corresponding to the gear position, and the compression amount of the elastic element 53 is also locked, so the support angle of the lumbar support will not change due to the user's movement.

[0048] Example 2

[0049] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the lumbar support of Embodiment 1, this embodiment describes a first implementation method for the lumbar support.

[0050] The lumbar support includes a lumbar support bracket 1, a central lumbar support 2, and two side lumbar supports 3 located on the sides of the central lumbar support 2. The lumbar support bracket 1 and the side lumbar supports 3 are hinged together. The central lumbar support 2 and the side lumbar supports 3 are respectively connected by a telescopic hinge mechanism 4. At least part 41 of the telescopic hinge mechanism 4 is hinged to the remaining part 42 of the telescopic hinge mechanism 4.

[0051] The difference lies in the arrangement direction of the central lumbar support 2 and the side lumbar support 3. At least part 41 of the telescopic hinge mechanism 4 is telescopically and slidably connected to the side lumbar support 3, while the remaining part of the telescopic hinge mechanism 4 is fixed to the central lumbar support 2.

[0052] Specifically, such as Figures 2-5 The telescopic hinge mechanism 4 shown includes at least a first hinge portion 41, and the remaining portion 42 of the telescopic hinge mechanism 4 includes a second hinge portion 421, wherein the first hinge portion 411 and the second hinge portion 421 are hinged to each other.

[0053] In this embodiment, the design of the first hinge 411 being telescopically slidably connected to the side waist support 3 and the second hinge 421 being fixedly connected to the middle waist support 2 is exemplified.

[0054] The first hinge portion 411, at its end furthest from the hinge point with the second hinge portion 421, forms a telescopic sliding connection with the side waist support 3. Specifically, this end of the first hinge portion 411 is further provided with (or integrally formed with) a sliding connection portion 44, while the side waist support 3 is provided with a sliding connection position 43 extending along the arrangement direction of the central waist support 2 and the side waist support 3 (i.e., approximately the left-right horizontal direction). The sliding connection portion 44 is slidably accommodated within the sliding connection position 43, allowing the first hinge portion 411 to reciprocate linearly (i.e., telescopically) relative to the side waist support 3 along this arrangement direction.

[0055] Example 3

[0056] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the lumbar support of Embodiment 1, this embodiment describes a second implementation method for the lumbar support.

[0057] The lumbar support includes a lumbar support bracket 1, a central lumbar support 2, and two side lumbar supports 3 located on the sides of the central lumbar support 2. The lumbar support bracket 1 and the side lumbar supports 3 are hinged together. The central lumbar support 2 and the side lumbar supports 3 are respectively connected by a telescopic hinge mechanism 4. At least part 41 of the telescopic hinge mechanism 4 is hinged to the remaining part 42 of the telescopic hinge mechanism 4.

[0058] The difference lies in the arrangement direction of the central lumbar support 2 and the side lumbar support 3. At least part 41 of the telescopic hinge mechanism 4 is fixed to the side lumbar support 3, and the remaining part 42 of the telescopic hinge mechanism 4 is telescopically and slidably connected to the central lumbar support 2.

[0059] Specifically, such as Figures 2-5 The telescopic hinge mechanism 4 shown includes at least a first hinge portion 41, and the remaining portion 42 of the telescopic hinge mechanism 4 includes a second hinge portion 421, wherein the first hinge portion 411 and the second hinge portion 421 are hinged to each other.

[0060] The first hinge portion 411, at its end furthest from the hinge point with the second hinge portion 421, forms a telescopic sliding connection with the intermediate waist support 2. Specifically, this end of the first hinge portion 411 is further provided with (or integrally formed with) a sliding connection portion 44, while the intermediate waist support 2 is provided with a sliding connection position 43 extending along the arrangement direction of the side waist supports 3 and the intermediate waist support 2 (i.e., approximately the left-right horizontal direction). The sliding connection portion 44 is slidably accommodated within the sliding connection position 43, allowing the first hinge portion 411 to reciprocate linearly (i.e., telescopically) relative to the intermediate waist support 2 along this arrangement direction.

[0061] Example 4

[0062] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the lumbar support of Embodiment 1, this embodiment describes a third implementation method for the lumbar support.

[0063] The lumbar support includes a lumbar support bracket 1, a central lumbar support 2, and two side lumbar supports 3 located on the sides of the central lumbar support 2. The lumbar support bracket 1 and the side lumbar supports 3 are hinged together. The central lumbar support 2 and the side lumbar supports 3 are respectively connected by a telescopic hinge mechanism 4. At least part 41 of the telescopic hinge mechanism 4 is hinged to the remaining part 42 of the telescopic hinge mechanism 4.

[0064] The difference lies in the arrangement direction of the central lumbar support 2 and the side lumbar support 3. At least part 41 of one telescopic hinge mechanism 4 is fixed to the side lumbar support 3, and the remaining part of the telescopic hinge mechanism 4 is telescopically and slidably connected to the central lumbar support 2. At least part 41 of the other telescopic hinge mechanism 4 is telescopically and slidably connected to the side lumbar support 3, and the remaining part of the telescopic hinge mechanism 4 is fixed to the central lumbar support 2.

[0065] Specifically, such as Figures 2-5 The telescopic hinge mechanism 4 shown includes at least a first hinge portion 41, and the remaining portion 42 of the telescopic hinge mechanism 4 includes a second hinge portion 421, wherein the first hinge portion 411 and the second hinge portion 421 are hinged to each other.

[0066] Example 5

[0067] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the lumbar support of Embodiment 1, this embodiment describes a fourth implementation method for the lumbar support.

[0068] like Figure 12 As shown, the lumbar support includes a lumbar support bracket 1, a central lumbar support 2, and two side lumbar supports 3 located on the sides of the central lumbar support 2. The lumbar support bracket 1 and the side lumbar supports 3 are connected by a telescopic hinge mechanism 4. The central lumbar support 2 and the side lumbar supports 3 are hinged together. At least part 41 of the telescopic hinge mechanism 4 is hinged to the remaining part 42 of the telescopic hinge mechanism 4. In the arrangement direction of the central lumbar support 2 and the side lumbar supports 3, either at least part 41 or the remaining part 42 is telescopically and slidably connected to the lumbar support bracket 1, and the remaining part is fixed to the side lumbar supports 3.

[0069] In this embodiment, at least a portion 41 of the telescopic hinge mechanism 4 includes a first hinge portion 411, and the remaining portion 42 of the telescopic hinge mechanism 4 includes a second hinge portion 421, wherein the first hinge portion 411 and the second hinge portion 421 are hinged to each other.

[0070] Among them, such as Figure 14 As shown, the first hinge part 411 is slidably connected to the side waist support 3, and the side waist support 3 is provided with a groove 31 distributed along the arrangement direction of the middle waist support 2 and the side waist support 3. Therefore, the second hinge part 421 is fixedly connected to the support arm 11 of the waist support bracket 1, and a return spring 311 is also provided in the groove 31.

[0071] As previously stated, the first hinge portion 411 is mounted on the side waist support 3 via a sliding connection. Specifically, the end of the first hinge portion 411 is provided with... Figure 13The slider 412 shown (or directly forming a sliding part) is slidably embedded in a groove 31 provided on the side waist support 3. The extension direction of the groove 31 is parallel to the arrangement direction of the middle waist support 2 and the side waist support 3 (i.e., the left-right horizontal direction).

[0072] The main function of the return spring 311 is to provide a lateral elastic restoring force (along the arrangement direction) to the side lumbar support 3 towards its original or neutral position. When the side lumbar support 3 is subjected to an external force, causing the first hinge part 411 to slide outward away from the middle lumbar support 2 along the slide groove 31 relative to the side lumbar support 3 body (or relative to the second hinge part 421 fixed to the support arm 11), the return spring 311 will be compressed or stretched (one end of the return spring 311 will be fixedly connected to the first hinge part 411, and the other end will be fixedly connected to the second hinge part 421).

[0073] Once the external force decreases or disappears, the elastic potential energy stored in the return spring 311 is released, pushing the slider 412 (i.e. the first hinge part 411) to slide in the opposite direction in the groove 31, causing the side waist support 3 to automatically return to its position before being subjected to external force, or tend to a preset equilibrium position (usually corresponding to the natural posture when there is no lateral pressure on the waist).

[0074] Example 6

[0075] The structure and principle of this embodiment are basically the same as those of embodiments one to five. The difference is that, for the lumbar support of embodiments one to five above, the backrest assembly of this embodiment includes a lumbar support.

[0076] like Figures 9-11 As shown, the backrest assembly also includes a lumbar support bracket 1 integrally formed with the backrest bracket 7 or fixed to the backrest bracket 7 by a detachable structure. The backrest bracket 7 is also provided with a backrest frame 8 located on the upper side of the lumbar support.

[0077] The backrest frame 8 can move up and down relative to the backrest support 7. Therefore, as an alternative, in this embodiment, the lumbar support support 1 can be integrally formed with the backrest frame 8 or fixed to the backrest frame 8 through a detachable structure to achieve a higher degree of freedom of adjustment.

[0078] Meanwhile, a headrest 9 is provided at the top of the backrest support 7. The headrest 9 is similar to the backrest frame 8 and can move up and down the backrest support 7.

[0079] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A lumbar support, comprising a lumbar support bracket (1), a central lumbar support (2), and two side lumbar supports (3) located beside the central lumbar support (2), characterized in that, The lumbar support also includes a telescopic hinge mechanism (4), which is connected to the lumbar support bracket (1) and the side lumbar support (3) and / or the telescopic hinge mechanism (4) is connected to the middle lumbar support (2) and the side lumbar support (3). At least a portion (41) of the telescopic hinge mechanism (4) is hinged to the remaining portion (42) of the telescopic hinge mechanism (4), and in the arrangement direction of the middle lumbar support (2) and the side lumbar support (3), either the at least portion (41) or the remaining portion (42) is telescopically and slidably connected to the lumbar support bracket (1), the side lumbar support (3), or the middle lumbar support (2).

2. The lumbar support according to claim 1, characterized in that, At least a portion (41) of the telescopic hinge mechanism (4) includes a first hinge portion (411), and the remaining portion (42) of the telescopic hinge mechanism (4) includes a second hinge portion (421). The first hinge portion (411) and the second hinge portion (421) are hinged to each other, and either the first hinge portion (411) or the second hinge portion (421) is telescopically and slidably connected to the lumbar support bracket (1), the side lumbar support (3), or the middle lumbar support (2).

3. The lumbar support according to claim 2, characterized in that, The telescopic hinge mechanism (4) further includes a sliding connection position (43) and a sliding connection part (44) that are slidably connected to each other. Either the sliding connection position (43) or the sliding connection part (44) is located in the first hinge part (411) or the second hinge part (421), and the other is located in the middle waist support (2), the side waist support (3), or the waist support bracket (1).

4. A lumbar support, comprising a lumbar support bracket (1), a central lumbar support (2), and two side lumbar supports (3) located beside the central lumbar support (2), characterized in that, The lumbar support bracket (1) is hinged to the side lumbar support (3). The middle lumbar support (2) and the side lumbar support (3) are connected by a telescopic hinge mechanism (4). At least part (41) of the telescopic hinge mechanism (4) is hinged to the remaining part (42) of the telescopic hinge mechanism (4). In the arrangement direction of the middle lumbar support (2) and the side lumbar support (3), at least part (41) of the telescopic hinge mechanism (4) is telescopically and slidably connected to the side lumbar support (3). The remaining part of the telescopic hinge mechanism (4) is fixed to the middle lumbar support (2).

5. A lumbar support, comprising a lumbar support bracket (1), a central lumbar support (2), and two side lumbar supports (3) located beside the central lumbar support (2), characterized in that, The lumbar support bracket (1) is hinged to the side lumbar support (3). The middle lumbar support (2) and the side lumbar support (3) are connected by a telescopic hinge mechanism (4). At least part (41) of the telescopic hinge mechanism (4) is hinged to the remaining part (42) of the telescopic hinge mechanism (4). In the arrangement direction of the middle lumbar support (2) and the side lumbar support (3), the remaining part (42) of the telescopic hinge mechanism (4) is fixed to the side lumbar support (3). At least part (41) of the telescopic hinge mechanism (4) is telescopically and slidably connected to the middle lumbar support (2).

6. A lumbar support, comprising a lumbar support bracket (1), a central lumbar support (2), and two side lumbar supports (3) located beside the central lumbar support (2), characterized in that, The lumbar support bracket (1) is hinged to the side lumbar support (3). The middle lumbar support (2) and the side lumbar support (3) are connected by telescopic hinge mechanisms (4). At least part (41) of the telescopic hinge mechanism (4) is hinged to the remaining part (42) of the telescopic hinge mechanism (4). In the arrangement direction of the middle lumbar support (2) and the side lumbar support (3), at least part (41) of one of the telescopic hinge mechanisms (4) is fixed to the side lumbar support (3), and the remaining part of the telescopic hinge mechanism (4) is telescopically and slidably connected to the middle lumbar support (2). At least part (41) of the other telescopic hinge mechanism (4) is telescopically and slidably connected to the side lumbar support (3), and the remaining part of the telescopic hinge mechanism (4) is fixed to the middle lumbar support (2).

7. A lumbar support, comprising a lumbar support bracket (1), a central lumbar support (2), and two side lumbar supports (3) located beside the central lumbar support (2), characterized in that, The lumbar support bracket (1) and the side lumbar support (3) are connected by a telescopic hinge mechanism (4). The middle lumbar support (2) and the side lumbar support (3) are hinged together. At least part (41) of the telescopic hinge mechanism (4) is hinged to the remaining part (42) of the telescopic hinge mechanism (4). In the arrangement direction of the middle lumbar support (2) and the side lumbar support (3), either the at least part (41) or the remaining part (42) is telescopically and slidably connected to the lumbar support bracket (1), and the remaining part is fixed to the side lumbar support (3).

8. The lumbar support according to any one of claims 1-7, characterized in that, An elastic mechanism (5) is provided between the middle lumbar support (2) or the side lumbar support (3) and the lumbar support bracket (1), and the number of the elastic mechanism (5) is at least one set.

9. The lumbar support according to claim 8, characterized in that, The elastic mechanism (5) further includes a first sleeve portion (51) and a second sleeve portion (52) that slide together, and an elastic element (53) is provided in the internal space of the first sleeve portion (51) and the second sleeve portion (52) to reset the middle waist support (2) and the side waist support (3).

10. The lumbar support according to claim 9, characterized in that, The lumbar support also includes a gear locking mechanism (6), a plurality of gears (61) of the gear locking mechanism (6) are provided on the first sleeve part (51), and a locking block (62) of the gear locking mechanism (6) is provided on the second sleeve part (52). The locking block (62) is locked in any one of the gears (61) under the action of the locking spring (63).

11. A backrest assembly, characterized in that, The backrest assembly includes the lumbar support as described in any one of claims 1-10, and the lumbar support bracket (1) of the lumbar support is integrally formed with the backrest bracket (7) or fixed to the backrest bracket (7) by a detachable structure. The backrest bracket (7) is also provided with a backrest frame (8) located on the upper side of the lumbar support.

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