Width-adjustable backrest

Abstract

A width-adjustable backrest comprises a fixing plate and a plurality of back backup plates, guide rods which are bilaterally symmetrical 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. The two sides of the front side of each backup plate installation base are each elastically fixed with a back backup plate through an elastic structure, a gap is reserved between the left and right back backup plates, and the elastic structures are slidably and adjustably connected with the corresponding positions of the front sides of the backup plate installation bases through sliding adjusting devices and used for adjusting the distance between the left and right back backup plates. The distance between the left back backup plate and the right back backup plate, namely the width of the whole back plate, can be conveniently adjusted according to the requirements of customers, all-directional adaptive adjustment of the seat back plate is achieved, the whole adjusting process is simple and rapid, the back supporting requirements of the customers are better met, and the users feel more comfortable when leaning on the seat back plate.

Description

Technical Field

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

[0002] The advantages of adjustable backrests are mainly reflected in health protection, improved comfort, adaptability to different scenarios, and safety. They relieve spinal pressure, as adjustable backrests conform to the curves of the human back, distributing spinal pressure and preventing spinal fatigue or injury caused by prolonged sitting. They help maintain correct posture and adjust body shape; for example, adjustable office chair backrests can prevent lumbar spine diseases caused by poor posture. They promote blood circulation; by adjusting the backrest angle, leg and back pressure can be reduced, improving blood flow and relieving muscle stiffness, making them especially suitable for long hours of sitting at a desk or long-distance driving. Some car seats also incorporate massage functions to further relax muscles. Adjustable backrest and seat angles can match different work states (such as hunching over or resting), reducing fatigue and improving concentration. Bed backrests support multiple angle adjustments to meet the needs of reading, watching TV, etc. Camping chairs combine comfort and portability through folding designs. Personalized adjustable car seats support fore-aft, heel-and-groove, and backrest tilt adjustments to adapt to different heights and body types, optimizing legroom and driving visibility, and improving comfort and safety.

[0003] Utility model patent CN119682993A discloses an aircraft seat angle adjustment device, including a seat cushion bracket. A support shaft is fixedly installed at the rear end of the seat cushion bracket, and a backrest bracket is rotatably connected to the support shaft. A buttock blocking component is provided in the front half of the seat cushion bracket, and pushing components are provided on the rear sides of both ends of the buttock blocking component. A lumbar support component is provided in the lower half of the backrest bracket. By extending the output end of the cylinder, the slide moves forward along the slide groove, pulling steel wire rope one and steel wire rope two to adjust the tilt angle of the backrest bracket. The slide pushes the push rod on the right side forward, thereby causing the support rod one and support rod two to deflect. This makes the soft padding layer of the seat cushion bracket form a slope that is higher in the front and lower in the back, supporting the passenger's buttocks. During the rotation of the rotating tube, the two threaded collars move closer to each other, pushing the lumbar support plate forward. The inclined rib plate supports the passenger's waist, making the passenger more comfortable. However, this type of adjustable backrest design cannot properly adjust the support width of the back and is not conducive to effective back support. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a backrest with adjustable width.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a backrest with adjustable width, comprising a fixed plate and multiple backrest panels. The front side of the fixed plate is provided with symmetrical and parallel guide rods. The upper and lower ends of the two guide rods are respectively provided with backrest panel mounting seats that can slide up and down. Each backrest panel mounting seat is positioned and fixed by a locking device. Each backrest panel mounting seat has a backrest panel elastically fixed on both sides of its front side by an elastic structure. A gap is left between the left and right backrest panels. The elastic structure is slidably and adjustablely connected to the corresponding position on the front side of the backrest panel mounting seat by a sliding adjustment device to adjust the distance between the left and right backrest panels.

[0006] Furthermore, the sliding adjustment device includes a positioning slider and a positioning pin for insertion into a row of positioning holes on the side of the positioning slider. The back of the positioning slider is provided with a slide rail with a T-shaped cross section. The positioning slider is slidably mounted on the T-shaped slide rail provided at the end of the back plate mounting seat through the slide rail. One end of the elastic structure is fixed to the front of the positioning slider by a fixing clamp.

[0007] Furthermore, the positioning post is fixed to one end of the pressing and rotating block, and the other end of the pressing and rotating block is fixedly connected to the side wall of the back plate mounting seat through a spring. The pressing and rotating block between the spring and the positioning post is rotatably connected to the side wall of the back plate mounting seat through a rotating shaft. The positioning post passes through the positioning hole in the side wall of the back plate mounting seat.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] Furthermore, both ends of the protective casing are sealed with cap structures.

[0013] Furthermore, the fixing plate, backrest plate, and backrest plate mounting base are all curved plates.

[0014] 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.

[0015] Furthermore, each back panel is equipped with several ventilation holes.

[0016] 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.

[0017] 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.

[0018] In addition, the backrest can be height-adjusted according to the user's height and comfort requirements. During adjustment, pulling the pull ring will disengage the fixing pin from the corresponding positioning hole. Since the upper and lower guide rods each have a sliding backrest mounting base, once the fixing pin disengages from the corresponding positioning hole, the backrest mounting base can be moved up and down along the two guide rods, thus adjusting the upper and lower positions of the backrest. After adjusting to the desired position, releasing the pull ring will allow the fixing pin to re-position itself by inserting it into the corresponding positioning hole under the spring force. When adjusting the width of the left and right backrests, simply press and hold one end of the pressing and rotating block to set the return spring, thereby adjusting the other end. One end of the positioning post is positioned away from the positioning hole, allowing the corresponding positioning slider to move along the T-shaped slide rail. If it moves outwards, after reaching the desired distance, releasing the rotating block allows the return spring to reposition the positioning post back into the adjusted positioning hole, thus fixing the positioning slider in place. This locks the position after the width is adjusted, facilitating adjustment of the distance between the left and right backrest panels according to customer needs—the overall width of the backrest. This achieves comprehensive adaptive adjustment of the seat backrest, making the entire adjustment process simple and quick, better meeting the customer's back support needs and providing greater comfort when leaning back. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the present invention with the backrest removed;

[0021] Figure 3 This is a three-dimensional structural diagram of the sliding adjustment device of this utility model;

[0022] Figure 4 This is a three-dimensional structural diagram of the positioning slider of this utility model. 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 a backrest with adjustable width; please refer to the accompanying drawings in the instruction manual. Figure 1-4 .

[0027] like Figure 1-4 As shown, an adjustable backrest includes a fixed plate 1 and multiple backrest panels 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 slidably mounted on the backrest panels 4. Each backrest panel mounting seat 4 is positioned and fixed by a locking device. Each backrest panel 2 is elastically fixed to both sides of the front side of each backrest panel mounting seat 4 by an elastic structure 5. There is a gap between the left and right backrest panels 2. The elastic structure 5 is slidably and adjustablely connected to the corresponding position on the front side of the backrest panel mounting seat 4 by a sliding adjustment device to adjust the distance between the left and right backrest panels 2.

[0028] The specific width adjustment structure, namely the sliding adjustment device, includes a positioning slider 101 and a positioning post 103 for insertion into a row of positioning holes 102 on the side of the positioning slider 101. A T-shaped slide rail 104 is provided on the back of the positioning slider 101. The positioning slider 101 is slidably mounted on a T-shaped slide rail 105 at the end of the backrest mounting base 4 via the slide rail 104. One end of the elastic structure 5 is fixed to the front of the positioning slider 101 via a fixing clamp 106. The positioning post 103 is fixed to one end of a pressing rotating block 107. The other end of the pressing rotating block 107 is fixedly connected to the side wall of the backrest mounting base 4 via a return spring 108. The pressing and rotating block 107 between the spring 108 and the positioning post 103 is rotatably connected to the side wall of the backrest mounting seat 4 through a rotating shaft, so that the pressing and rotating block 107 forms a lever structure with the rotating shaft at this point as the fulcrum. The positioning post 103 passes through the positioning through hole 109 in the side wall of the backrest mounting seat 4. The fixed plate 1, the backrest 2 and the backrest mounting seat 4 are all arc-shaped plates. Each guide rod 3 is fixedly supported on the front side of the fixed plate 1 through the fixed block 16, and each guide rod 3 is far away from the fixed plate 1. Each backrest 2 is provided with a number of ventilation holes 17. The left and right backrests 2 are symmetrically arranged, and the area of ​​the top left and right backrests 2 is larger than that of the bottom left and right backrests 2.

[0029] 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.

[0030] The elastic structure 5 is a torsion spring. One end of the torsion spring is clamped and fixed to the back of the back plate 2 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.

[0031] Working principle of this utility model:

[0032] When it is necessary to adjust the width of the left and right backrest panels 2, simply press and hold one end of the pressing and rotating block 107 to set the return spring 108, so that the other end, i.e., the end of the positioning post 103, moves away from the positioning hole 102. In this way, the corresponding positioning slider 101 can move along the T-shaped slide rail 105 through the slide 104. If it moves outward, after moving to the appropriate distance, release the pressing and rotating block 107 again. Under the rebound action of the return spring 108, the positioning post 103 will be inserted back into the positioning hole 102 after the position has been adjusted, and the positioning slider 101 will be positioned and fixed again. Thus, after the width is adjusted, it is locked. This makes it easy to adjust the distance between the left and right backrest panels 2, i.e., the width of the entire back panel, according to the customer's needs.

[0033] The middle part of the fixing pin 6 is fitted with a pull ring 9 for pulling the fixing pin 6. Pulling the pull ring 9 will disengage the fixing pin 6 from the corresponding positioning hole 10. Since the upper and lower guide rods 3 are respectively connected by sliding backrest mounting seats 4, after the fixing pin 6 disengages from the corresponding positioning hole 10, the backrest mounting seats 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 fixing 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 the user more comfortable when leaning against it.

[0034] 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. A backrest with adjustable width, comprising a fixed plate (1) and a plurality of backrest panels (2), characterized in that: The front side of the fixed plate (1) is provided with two guide rods (3) which are symmetrical and parallel to each other, the upper and lower parts of the two guide rods (3) are respectively penetrated by the backrest mounting seat (4) which can slide up and down, and each backrest mounting seat (4) is positioned and fixed by the locking device, the two sides of the front side of each backrest mounting seat (4) are respectively elastically fixed with a back backrest (2) through the elastic structure (5), there is a gap between the left and right back backrests (2), and the elastic structure (5) is slidably connected with the corresponding position of the front side of the backrest mounting seat (4) through the sliding adjusting device, for adjusting the distance between the left and right back backrests (2).

2. A width adjustable backrest according to claim 1, characterized in that: The sliding adjusting device comprises a positioning sliding block (101) and a positioning column (103) inserted into a row of positioning holes (102) on the side of the positioning sliding block (101), the back of the positioning sliding block (101) is provided with a slide (104) with a T-shaped cross section, the positioning sliding block (101) is slidably arranged on the T-shaped slide rail (105) arranged at the end of the backrest mounting seat (4) through the slide (104), and one end of the elastic structure (5) is fixed on the front surface of the positioning sliding block (101) through a fixed clamping plate (106).

3. A width adjustable backrest according to claim 2, characterized in that: The positioning column (103) is fixed at one end of the pressing rotating block (107), the other end of the pressing rotating block (107) is fixedly connected with the side wall of the backrest mounting seat (4) through the rebound spring (108), and the pressing rotating block (107) between the rebound spring (108) and the positioning column (103) is rotatably connected with the side wall of the backrest mounting seat (4) through a rotating shaft, and the positioning column (103) penetrates the positioning through hole (109) in the side wall of the backrest mounting seat (4).

4. The width-adjustable backrest according to claim 1, characterized in that: The locking device comprises a U-shaped fixed bolt (6) and a spring (7) on the left and right vertical parts of the fixed bolt (6), one end of each side spring (7) is in contact with the washer (8) fixed with the fixed bolt (6), the other end of each side spring (7) is in contact with the lower surface of the backrest mounting seat (4), the middle part of the fixed bolt (6) is sleeved with a pull ring (9) for pulling the fixed bolt (6), the middle part of the fixed plate (1) is provided with a plurality of pairs of positioning holes (10) arranged along the guide rod (3), and the insertion end of the fixed bolt (6) is inserted into one of the positioning holes (10).

5. The width-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 on the back of the back backrest (2) through a mounting plate (11), each elastic structure (5) has two groups of torsion springs, and the two ends of the two groups of torsion springs are fixedly connected through connecting rods (12) to form an integrated structure.

6. A width adjustable backrest according to claim 5, characterized in that: The main part of the torsion spring of each elastic structure (5) is sleeved with a cylindrical protective shell (13), the protective shell (13) is provided with a movable opening (14) for penetrating the fixed end of the torsion spring and for the movement of the torsion spring, and the two ends of the protective shell (13) are respectively plugged with plug cover structures (15).

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

8. A width 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) through a fixed block (16), and the guide rod (3) is away from the fixed plate (1).

9. The width-adjustable backrest according to claim 1, characterized in that: The backrests (2) of the blocks are respectively provided with a plurality of air holes (17).

10. The width-adjustable backrest according to claim 1, characterized in that: The left and right backrests (2) are symmetrically arranged, and the areas of the top left and right backrests (2) are greater than those of the bottom left and right backrests (2).

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