A backrest structure of a seat

Abstract

This utility model belongs to the technical field of office chair backrests, specifically relating to a split-back support type backrest structure, including a first backrest and a second backrest; both the first and second backrests include a support layer and a sleeve covering the support layer, the thickness of the support layer of the first backrest is greater than that of the support layer of the second backrest; the sleeves of the first and second backrests are connected by a connecting strap. The purpose of this utility model is to improve the comfort and practicality of the backrest by optimizing the backrest structure, making it easier to maintain and clean.

Description

Technical Field

[0001] This utility model belongs to the field of office chair back technology, specifically relating to a split-back support type backrest structure. Background Technology

[0002] In modern office environments, prolonged sitting has become commonplace, leading to increasingly prominent lumbar spine health problems. Office workers often experience lower back pain due to prolonged sitting, primarily caused by poor posture, insufficient chair support leading to deformation of the lumbar spine's physiological curvature, and muscle fatigue. While traditional office chairs have basic backrests, most designs fail to provide adequate support for the lumbar region, resulting in room for improvement in comfort.

[0003] The document with authorization announcement number CN222109685U discloses a split-back office chair, including a back panel and a base. The back panel has a curved surface design and a split-back structure is installed on it. The back panel structure includes two large back cushions installed on the back panel. The curved surface design conforms to the natural curve of the human body, while the large back cushions can wrap around the back and improve comfort.

[0004] However, the device still has at least the following problems: the back pad is fixedly installed on the back panel, which not only makes the back panel less breathable, but also makes it difficult to clean. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide a split-back support structure. By optimizing the backrest structure, the comfort and practicality of the backrest itself are improved, making it easier to maintain and clean.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A split-back support structure includes a first back pad and a second back pad; both the first and second back pads include a support layer and a sleeve covering the support layer, the thickness of the support layer of the first back pad is greater than that of the support layer of the second back pad; the sleeves of the first and second back pads are connected by a connecting strap.

[0008] As a further preferred embodiment of the present invention, the support layer includes two symmetrically arranged support blocks, and the sleeve has a limit band at the two support blocks.

[0009] As a further preferred embodiment of the present invention, both the first back pad and the second back pad include a support block and an extension sleeve. The support block is located at the end of the support layer near the connecting band, and the extension sleeve covers the support block and is connected to the sleeve.

[0010] As a further preferred embodiment of the present invention, the connecting strap includes a hanging part and a positioning part, the hanging part is installed on the upper end of the back plate, and the positioning part is installed on the back side of the back plate; the first back pad and the second back pad are respectively located on the front side and the back side of the back plate.

[0011] As a further preferred embodiment of the present invention, the positioning part includes a positioning hole disposed on the connecting strip and at least one positioning protrusion disposed on the back side of the back plate that matches the positioning hole.

[0012] As a further preferred embodiment of this utility model, a movable support structure is also provided on the front side of the back plate, and the lower end of the first back pad or the second back pad abuts against the front side of the movable support structure.

[0013] As a further preferred embodiment of the present invention, the movable support structure includes a support plate connected to the first back pad or the second back pad, a connecting block disposed on the back side of the support plate, a first connecting hole disposed on the connecting block, a support rod installed on the back plate, seat plate or armrest, a fixing block disposed on the support rod, a second connecting hole disposed on the fixing block, and a rotating shaft passing through the first connecting hole and the second connecting hole for connecting the connecting block and the fixing block, wherein limit rings are provided at both ends of the rotating shaft.

[0014] As a further preferred embodiment of the present invention, the movable support structure further includes a plurality of protrusions disposed on the surface of the support plate connected to the first back pad or the second back pad and distributed at intervals.

[0015] As a further preferred embodiment of this utility model, the number of the movable support structures is two, and they are symmetrically arranged on the front side of the back plate.

[0016] As a further preferred embodiment of this invention, the support block is an arc-shaped protrusion.

[0017] As a further preferred embodiment of this invention, the connecting strip is a flexible strip.

[0018] The beneficial effects of this utility model are:

[0019] The backrest structure provided by this utility model can quickly switch between soft and hard support effects, and is easy to disassemble and replace, with the advantages of high flexibility, good practicality and easy maintenance.

[0020] The backrest structure provided by this invention can provide dynamic and precise support to the lumbar spine area in zones, so that the pressure distribution of the intervertebral discs is even and helps to reduce the risk of degenerative diseases. Attached Figure Description

[0021] Appendix Figure 1This is a structural schematic diagram of the present invention applied to an office chair from a frontal view angle.

[0022] Appendix Figure 2 This is a schematic diagram of the structure of this utility model applied to an office chair from a side view.

[0023] Appendix Figure 3 This is another structural schematic diagram of the present invention applied to an office chair from a side view angle.

[0024] Appendix Figure 4 This is a schematic diagram of the structure of this utility model.

[0025] Appendix Figure 5 This is a schematic diagram of the back side structure of the support plate of this utility model.

[0026] Appendix Figure 6 This is a schematic diagram of the front structure of the fixing block of this utility model.

[0027] Appendix Figure 7 This is a schematic diagram of the front structure of the support plate of this utility model.

[0028] Attached diagram: Backrest a, Seat b, Armrest c;

[0029] First back pad 11, second back pad 12, connecting strap 13, movable support structure 2;

[0030] Support layer 111, sleeve 112, support block 113, extension sleeve 114;

[0031] Support block 111a, limiting band 112a;

[0032] Mounting part 131, positioning hole 132, positioning protrusion 133;

[0033] Support plate 21, connecting block 22, first connecting hole 23, support rod 24, fixing block 25, second connecting hole 26, rotating shaft 27, limiting ring 28, protrusion 29. Detailed Implementation

[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component 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.

[0035] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0036] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] As attached Figure 1 ~Appendix Figure 5 As shown, this embodiment provides a split-back support structure, mainly used in office chairs. An office chair structure generally includes a backrest (a), a seat (b), and armrests (c), which are known technologies in the art and will not be described in detail here. The purpose of the backrest structure provided in this embodiment is to improve the lumbar support of the office chair while enhancing breathability, comfort, and flexibility to meet the diverse needs of different scenarios and users.

[0038] The backrest structure provided in this embodiment mainly includes: a first back cushion 11 and a second back cushion 12; both the first back cushion 11 and the second back cushion 12 include a support layer 111 and a sleeve 112 covering the support layer 111. The thickness of the support layer 111 of the first back cushion 11 is greater than that of the support layer 111 of the second back cushion 12. The sleeve 112 of the first back cushion 11 and the sleeve 112 of the second back cushion 12 are connected by a connecting strap 13.

[0039] The support layer 111 can be made of common materials such as high-density sponge, while the sleeve 112 can be made of common fabrics such as cloth or leather. To facilitate the removal of the support layer 111, the sleeve 112 can have at least one opening for the support layer 111 to enter and exit, and a zipper can be sewn into the opening. The connecting strap 13 is preferably a flexible strap, that is, made of materials with good tensile strength such as cloth or leather. The connection method between the connecting strap 13 and the sleeve 112 can be a fixed method such as sewing, or a detachable connection method such as the use of buttons and buttonholes.

[0040] Preferably, the connecting strap 13 includes a mounting part 131 and a positioning part. The mounting part 131 is installed on the upper end of the back plate a, and the positioning part is installed on the back side of the back plate a. The first back pad 11 and the second back pad 12 are located on the front side and the back side of the back plate a, respectively.

[0041] The first back pad 11 and the second back pad 12 are made with support layers 111 of different thicknesses to provide the backrest structure with two support thicknesses to match different support needs. Switching between the two back pad thicknesses is achieved by pulling the connecting strap 13 to remove the backrest structure from the back panel, swapping the positions of the two back pads, and then hanging them back onto the back panel a via the connecting strap 13. When the back pad located on the back side of the back panel a is not in use, it can be removed for replacement or cleaning (when the connecting strap 13 and the sleeve 112 are detachably connected), thereby improving practicality, reducing maintenance costs, and providing more personalized options to meet the aesthetic needs of users.

[0042] Preferably, the positioning part includes a positioning hole 132 provided on the connecting strap 13, and at least one positioning protrusion 133 provided on the back side of the back plate a that matches the positioning hole 132. This arrangement helps to improve the support stability of the back pad. The number of positioning holes 132 can be multiple, and the number of positioning protrusions 133 can also be multiple along the height direction, thereby allowing adjustment of the position of the front back pad on the back plate a.

[0043] Preferably, the support layer 111 includes two symmetrically arranged support blocks 111a, and the sleeve 112 has limiting bands 112a at the two support blocks 111a. The two support blocks 111a are identical in size, and the limiting bands 112a prevent slippage of the two support blocks 111a within the sleeve 112. The limiting bands 112a can be formed using common methods such as stitching. The purpose of providing two support blocks 111a is to provide left and right back support in a partitioned manner, making it easier to conform to the back curve and enhancing the support effect.

[0044] Preferably, both the first backrest 11 and the second backrest 12 include a support block 113 and an extension sleeve 114. The support block 113 is located at the end of the support layer 111 near the connecting strap 13, and the extension sleeve 114 covers the support block 113 and is connected to the sleeve 112. The support block 113 can be an arc-shaped protrusion or a protrusion with a circular cross-section, and the material can be the same as that of the support layer 111. When the backrest structure is installed on the back panel a, the front support block 113 is located between the back panel a and the upper end of the support layer 111, reinforcing the upper end of the support layer 111. Furthermore, the position of the support block 113 conforms to the upper back or neck in a seated position, further improving the support effect and enhancing comfort. With the movable support 2 set as described below, the lower middle part of the support layer 111 is supported and lifted by the support plate 21. At this time, there is a large gap between the support layer 111 and the back plate a. The support block 113 can fill this gap to ensure the full support effect of the support layer 111 and also help to improve the service life of the support layer 111.

[0045] As some preferred embodiments, see the appendix. Figures 2-3 Appendix Figures 5-7 As shown, a movable support structure 2 is also provided on the front side of the back panel a, and the lower end of the first back pad 11 or the second back pad 12 abuts against the front side of the movable support structure 2. There are two movable support structures 2, which are symmetrically arranged on the front side of the back panel a. Each movable support structure 2 corresponds to a support block 111a, thereby achieving the effect of dynamic support for the back in zones.

[0046] The movable support structure 2 includes a support plate 21 connected to the first back pad 11 or the second back pad 12, a connecting block 22 disposed on the back side of the support plate 21, a first connecting hole 23 disposed on the connecting block 22, a support rod 24 mounted on the back plate a, the seat plate b, or the armrest c, a fixing block 25 disposed on the support rod 24, a second connecting hole 26 disposed on the fixing block 25, and a rotating shaft 27 passing through the first connecting hole 23 and the second connecting hole 26 to connect the connecting block 22 and the fixing block 25. Limiting rings 28 are provided at both ends of the rotating shaft 27. The cooperation between the back pad and the movable support structure 2 can both enhance the support effect and improve comfort. The specific principle is as follows: when the back applies force to the back pad, the back pad transmits the force to the support plate 21, thereby causing the connecting block 22 to rotate relative to the fixing block 25. This provides dynamic and precise support to the lumbar spine area, resulting in even distribution of intervertebral disc pressure and reducing the risk of degenerative changes.

[0047] The support plate 21 and connecting block 22, and the fixing block 25 and support rod 24 can be integrally injection molded. The first connecting hole 23 and the second connecting hole 26 are formed directly during the injection molding process. The rotating shaft 27 and the limiting ring 28 are conventional structures in this field, such as the structure of a screw and nut, and will not be described in detail.

[0048] Preferably, the movable support structure 2 further includes a plurality of protrusions 29 spaced apart on the surface where the support plate 21 connects to the first back pad 11 or the second back pad 12. This arrangement can both enhance the sliding resistance between the support plate 21 and the back pad and provide a certain massage effect on the back.

[0049] 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 split-back support type backrest structure, characterized in that: It includes a first back pad (11) and a second back pad (12); both the first back pad (11) and the second back pad (12) include a support layer (111) and a sleeve (112) covering the support layer (111). The thickness of the support layer (111) of the first back pad (11) is greater than that of the support layer (111) of the second back pad (12). The sleeve (112) of the first back pad (11) and the sleeve (112) of the second back pad (12) are connected by a connecting strap (13).

2. The backrest structure with split back support according to claim 1, characterized in that: The support layer (111) includes two symmetrically arranged support blocks (111a), and the sleeve (112) is provided with limit bands (112a) at the two support blocks (111a).

3. The backrest structure with split back support according to claim 1, characterized in that: The first back pad (11) and the second back pad (12) both include a support block (113) and an extension sleeve (114). The support block (113) is located at the end of the support layer (111) near the connecting band (13). The extension sleeve (114) covers the support block (113) and is connected to the sleeve (112).

4. The backrest structure with split back support according to claim 1, characterized in that: The connecting strap (13) includes a mounting part (131) and a positioning part. The mounting part (131) is installed on the upper end of the back plate (a), and the positioning part is installed on the back side of the back plate (a). The first back pad (11) and the second back pad (12) are located on the front side and the back side of the back plate (a), respectively.

5. A backrest structure with split back support according to claim 4, characterized in that: The positioning part includes a positioning hole (132) provided on the connecting strip (13) and at least one positioning protrusion (133) provided on the back side of the back plate (a) that matches the positioning hole (132).

6. A split-back support type backrest structure according to claim 4, characterized in that: The front side of the back plate (a) is also provided with a movable support structure (2), and the lower end of the first back pad (11) or the second back pad (12) abuts against the front side of the movable support structure (2).

7. A split-back support type backrest structure according to claim 6, characterized in that: The movable support structure (2) includes a support plate (21) connected to the first back pad (11) or the second back pad (12), a connecting block (22) disposed on the back side of the support plate (21), a first connecting hole (23) disposed on the connecting block (22), a support rod (24) mounted on the back plate (a), the seat plate (b), or the armrest (c), a fixing block (25) disposed on the support rod (24), a second connecting hole (26) disposed on the fixing block (25), and a rotating shaft (27) passing through the first connecting hole (23) and the second connecting hole (26) for connecting the connecting block (22) and the fixing block (25), wherein the rotating shaft (27) is provided with limit rings (28) at both ends.

8. A split-back support type backrest structure according to claim 7, characterized in that: The movable support structure (2) further includes a plurality of protrusions (29) disposed on the surface of the support plate (21) connected to the first back pad (11) or the second back pad (12) and distributed at intervals.

9. A split-back support type backrest structure according to claim 7, characterized in that: The number of the movable support structures (2) is two, and they are symmetrically arranged on the front side of the back plate (a).

10. A split-back support type backrest structure according to claim 3, characterized in that: The support block (113) is an arc-shaped protrusion.

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