Adjustable backrest

Abstract

An adjustable backrest comprises a fixing plate and a plurality of back backup plates, guide rods which are symmetrical left and right and parallel to each other are arranged on the front side face of the fixing plate, backup plate mounting seats capable of sliding up and down penetrate through the upper portions and the lower portions of the two guide rods respectively, and the backup plate mounting seats are positioned and fixed through locking devices respectively. A back backup plate is elastically fixed on each of the two sides of the front side of each backup plate mounting seat through an elastic structure; the locking device comprises a U-shaped fixing plug pin and springs arranged on the left vertical portion and the right vertical portion of the fixing plug pin, a plurality of pairs of positioning holes distributed along the guide rod are formed in the middle of the fixing plate, and the inserting ends of the fixing plug pin are correspondingly inserted into one pair of positioning holes respectively. Each back backup plate is independently arranged, so that the spine is effectively prevented from being pressed when the back backup plate is in contact with the backrest, the burden and harm to the back of a human body caused by long-time sitting are effectively reduced, the height of the back backup plates can be adjusted, the whole adjusting process is simple and rapid, and a user can conveniently carry out adaptive adjustment according to needs.

Description

Technical Field

[0001] This utility model relates to the field of backrest technology, specifically an adjustable backrest. Background Technology

[0002] Adjustable backrests are a common feature in chair design, primarily aimed at providing users with a more comfortable and personalized sitting experience. Currently, by adjusting the backrest angle, users can find the most suitable support position according to their body type and sitting habits, thereby reducing fatigue and discomfort caused by prolonged sitting. An appropriate backrest angle helps maintain correct posture, reduces pressure on the spine and neck, and prevents health problems caused by poor posture, such as cervical spondylosis and lumbar spondylosis. The adjustable backrest function allows the chair to adapt to people of different heights and body types, improving the chair's versatility and applicability. A comfortable sitting posture helps improve concentration and work efficiency, reducing distractions caused by discomfort. For example, utility model patent CN222510285U discloses a chair posture adjustment mechanism, including a base... The invention comprises a seat, a backrest, and an adjustment assembly. The adjustment assembly includes a fixed structure and a connecting structure. The backrest is movably connected to the end of the base via the connecting structure. Fixed structures are symmetrically installed on both sides of the base, and armrests are symmetrically installed on both sides of the backrest. The armrests are L-shaped and embedded in the fixed structures. The fixed structures are used to control the range of motion of the backrest. The invention includes a sliding plate, armrests, and fitting grooves. During adjustment, simply pull the sliding plate outward to force the limiting hole to disengage from the inner wall of the fitting groove, release the fixing between the adjustment cylinder and the armrest, and then rotate the backrest on the connecting plate to achieve a small range of adjustment of the angle between the backrest and the base.

[0003] However, the current adjustable backrest design increases the complexity and manufacturing cost of the seat, leading to higher prices. The adjustment mechanism may malfunction or wear due to frequent use, increasing the difficulty and cost of maintenance and repair. If users do not use the adjustment function correctly, such as excessive tilting or adjusting to an inappropriate angle, it may lead to poor posture and increase the burden on the body. The biggest drawback is that the one-piece backrest design cannot adaptively and fully support the human back. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide an adjustable backrest.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: an adjustable backrest, including a fixed plate and multiple backrest plates, wherein the front side of the fixed plate is provided with symmetrical and parallel guide rods, and the upper and lower sides of the two guide rods are respectively provided with backrest plate mounting seats that can slide up and down, and each backrest plate mounting seat is positioned and fixed by a locking device, and a backrest plate is elastically fixed on both sides of the front side of each backrest plate mounting seat by an elastic structure, and a gap is left between the left and right backrest plates.

[0006] Furthermore, the locking device includes a U-shaped fixing pin and springs on the left and right vertical parts of the fixing pin. One end of each spring contacts the washer that fixes the fixing pin, and the other end of each spring contacts the lower surface of the mounting plate. A pull ring for pulling the fixing pin is sleeved in the middle part of the fixing pin. Multiple pairs of positioning holes are provided in the middle part of the fixing plate along the guide rod, and the insertion end of the fixing pin is inserted into one of the pairs of positioning holes respectively.

[0007] Furthermore, the elastic structure is a torsion spring, one end of which is clamped and fixed to the back of the backrest plate by a mounting plate, and the other end of which is clamped and fixed to the front side of the backrest plate mounting base by a mounting plate.

[0008] Furthermore, each elastic structure has two sets of torsion springs, and the two fixed ends of the two sets of torsion springs are fixedly connected by connecting rods to form an integrated structure.

[0009] Furthermore, each torsion spring body of the elastic structure is fitted with a cylindrical protective shell, and the protective shell is provided with an opening for the fixed end of the torsion spring to pass through and for the torsion spring to move.

[0010] Furthermore, both ends of the protective casing are sealed with cap structures.

[0011] Furthermore, the fixing plate, backrest plate, and backrest plate mounting base are all curved plates.

[0012] Furthermore, each guide rod is fixedly supported on the front side of the fixed plate by a fixing block, and each guide rod is kept away from the fixed plate.

[0013] Furthermore, each back panel is equipped with several ventilation holes.

[0014] Furthermore, the left and right back panels are symmetrically arranged, and the area of ​​the top left and right back panels is larger than that of the bottom left and right back panels.

[0015] This utility model is not only simple in structure and easy to process, but also more comfortable to use. Two guide rods are respectively pierced by sliding backrest mounting seats, and each backrest mounting seat is positioned and fixed by a locking device. A backrest plate is elastically fixed to both sides of the front of each backrest mounting seat via an elastic structure. Thus, each backrest plate is independently set and has good elasticity and cushioning effect, facilitating comprehensive and effective elastic support for the back, making it more comfortable to lean against and effectively relieving fatigue. A gap is left between the left and right backrest plates, allowing the human spine to rest within the gap, effectively avoiding pressure on the spine when in contact with the backrest, and effectively reducing the burden and harm to the human back caused by prolonged sitting.

[0016] In addition, the backrest can be height-adjusted according to the user's height, comfort, and other requirements. During adjustment, pulling the pull ring will disengage the fixing pin from the corresponding positioning hole. Since the upper and lower guide rods are respectively connected to the backrest mounting bases that can slide up and down, after the fixing pin disengages from the corresponding positioning hole, the backrest mounting bases can be moved up and down along the two guide rods, thereby moving the upper and lower positions of the backrest. After adjusting to the appropriate position, release the pull ring, and the fixing pin will be inserted into the corresponding positioning hole under the elastic force of the spring to complete the repositioning and fixing. The whole adjustment process is simple and quick, making it easy for users to make adaptive adjustments as needed, so that users can lean back more comfortably. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a front three-dimensional structural diagram of the present invention;

[0019] Figure 3 This is a three-dimensional structural diagram of the rear side of this utility model;

[0020] Figure 4 This is a bottom-view three-dimensional structural diagram of the present invention;

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the present invention with the backrest removed. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.

[0025] The following is a detailed description of this embodiment with reference to the accompanying drawings:

[0026] This embodiment provides an adjustable backrest; please refer to the accompanying drawings in the instruction manual. Figure 1-6 .

[0027] like Figure 1-6 As shown, an adjustable backrest includes a fixed plate 1 and multiple backrest plates 2. The front side of the fixed plate 1 is provided with symmetrical and parallel guide rods 3. The upper and lower sides of the two guide rods 3 are respectively slidable backrest mounting seats 4, and each backrest mounting seat 4 is positioned and fixed by a locking device. Each backrest mounting seat 4 is elastically fixed to one of the two sides of the front side of the front side by an elastic structure 5, and a gap is left between the left and right backrest plates. The fixed plate 1, the backrest plates 2 and the backrest mounting seats 4 are all arc-shaped plates. Each guide rod 3 is fixedly supported on the front side of the fixed plate 1 by a fixing block 16, and each guide rod 3 is far away from the fixed plate 1. Each backrest plate 2 is provided with a number of ventilation holes 17. The left and right backrest plates 2 are symmetrically arranged, and the area of ​​the top left and right backrest plates 2 is larger than that of the bottom left and right backrest plates 2.

[0028] Specifically: The locking device includes a U-shaped fixing pin 6 and springs 7 on the left and right vertical parts of the fixing pin 6. One end of each spring 7 is in contact with the washer 8 that fixes the fixing pin 6, and the other end of each spring 7 is in contact with the lower surface of the mounting plate 4. A pull ring 9 for pulling the fixing pin 6 is sleeved in the middle part of the fixing pin 6. Multiple pairs of positioning holes 10 are provided in the middle part of the fixing plate 1 along the guide rod 3. The insertion end of the fixing pin 6 is inserted into one of the pairs of positioning holes 10 respectively.

[0029] The elastic structure 5 is a torsion spring. One end of the torsion spring is clamped and fixed to the back of the backrest plate 2 by the mounting plate 11, and the other end of the torsion spring is clamped and fixed to the front side of the backrest mounting base 4 by the mounting plate 11. Each elastic structure 5 has two sets of torsion springs, and the two fixed ends of the two sets of torsion springs are fixedly connected by the connecting rod 12 to form an integrated structure. This makes the support more stable and firm. In order to better protect the elastic structure 5, the main body of the torsion spring of each elastic structure 5 is covered with a cylindrical protective shell 13. The protective shell 13 is provided with an active opening 14 for the fixed end of the torsion spring to pass through and for the movement of the torsion spring. The two ends of the protective shell 13 are respectively sealed with a plug structure 15.

[0030] The working principle of this utility model is as follows: A pull ring 9 is fitted in the middle of the fixed pin 6 for pulling the fixed pin 6. Pulling the pull ring 9 will disengage the fixed pin 6 from the corresponding positioning hole 10. Since the upper and lower guide rods 3 are respectively connected by a backrest mounting seat 4 that can slide up and down, after the fixed pin 6 disengages from the corresponding positioning hole 10, the backrest mounting seat 4 can be moved up and down along the two guide rods 3, thereby moving the upper and lower backrest 2. After adjusting to the appropriate position, the pull ring 9 is released, and the fixed pin 6 is inserted into the corresponding positioning hole 10 under the elastic force of the spring 7 to complete the repositioning and fixing. This allows the user to make adaptive adjustments as needed, making it more comfortable for the user to lean against.

[0031] Of course, the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An adjustable backrest, comprising a fixed plate (1) and multiple backrest panels (2), characterized in that: The front side of the fixed plate (1) is provided with symmetrical and parallel guide rods (3). The upper and lower sides of the two guide rods (3) are respectively slidable backrest mounting seats (4). Each backrest mounting seat (4) is positioned and fixed by a locking device. Each backrest mounting seat (4) has a backrest plate (2) elastically fixed on both sides of the front side by an elastic structure (5). There is a gap between the left and right backrest plates (2).

2. An adjustable backrest according to claim 1, characterized in that: The locking device includes a U-shaped fixing pin (6) and springs (7) on the left and right vertical parts of the fixing pin (6). One end of each spring (7) contacts the washer (8) that fixes the fixing pin (6), and the other end of each spring (7) contacts the lower surface of the mounting base (4). A pull ring (9) for pulling the fixing pin (6) is sleeved in the middle part of the fixing pin (6). Multiple pairs of positioning holes (10) are arranged along the guide rod (3) in the middle part of the fixing plate (1). The insertion end of the fixing pin (6) is inserted into one of the pairs of positioning holes (10) respectively.

3. An adjustable backrest according to claim 1, characterized in that: The elastic structure (5) is a torsion spring. One end of the torsion spring is clamped and fixed to the back of the backrest (2) by the mounting plate (11), and the other end of the torsion spring is clamped and fixed to the front side of the backrest mounting seat (4) by the mounting plate (11).

4. An adjustable backrest according to claim 3, characterized in that: Each elastic structure (5) has two sets of torsion springs, and the two fixed ends of the two sets of torsion springs are fixedly connected by connecting rods (12) to form an integrated structure.

5. An adjustable backrest according to claim 3, characterized in that: Each elastic structure (5) has a cylindrical protective shell (13) fitted around its torsion spring body, and the protective shell (13) has an active opening (14) for the torsion spring to pass through its fixed end and for the torsion spring to move.

6. An adjustable backrest according to claim 5, characterized in that: The protective outer shell (13) is sealed with a cap structure (15) at both ends.

7. An adjustable backrest according to claim 1, characterized in that: The fixing plate (1), the backrest plate (2) and the backrest mounting base (4) are all arc-shaped plates.

8. An adjustable backrest according to claim 1, characterized in that: Each guide rod (3) is fixedly supported on the front side of the fixed plate (1) by a fixing block (16), and each guide rod (3) is kept away from the fixed plate (1).

9. An adjustable backrest according to claim 1, characterized in that: Each back panel (2) has several ventilation holes (17).

10. An adjustable backrest according to claim 1, characterized in that: The left and right back panels (2) are symmetrically arranged, and the area of ​​the top left and right back panels (2) is larger than that of the bottom left and right back panels (2).

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