Elastic self-resetting backrest seat

Abstract

The utility model provides an elastic self-resetting backrest seat, which relates to the technical field of office furniture, and comprises a waist leaning part and a backrest part, a fixed cover plate is arranged on the waist leaning part, a support piece is rotatably connected on the fixed cover plate, and the backrest part is connected on the support piece; a limiting space is formed between the fixed cover plate and the waist leaning part, and the lower end of the supporting piece extends and is inserted into the limiting space; the limiting space is further provided with a reset component used for abutting against the supporting piece. The chair has the beneficial effects that the backrest part is movably connected to the waist leaning part by adopting various structures such as the fixed cover plate, the supporting piece, the bolt and the reset part, so that the backrest part can rotate relative to the waist leaning part in the process that a human body leans backwards, and the backrest part is reset under the action of the reset part when the human body leans forwards; therefore, differentiated support is provided for different parts of the back of the human body, the comfort level is high, and muscle fatigue is reduced.

Description

Technical Field

[0001] This utility model relates to the field of office furniture technology, and in particular to a spring-loaded self-resetting backrest chair. Background Technology

[0002] Office chairs on the market today typically consist of three main parts: the seat, the height-adjustable base, and the backrest. The seat is the part that the user directly contacts when sitting down, the height-adjustable base is fixedly installed at the bottom of the seat and used to adjust the seat height, and the backrest is fixedly located at the rear of the seat to support the user's lower back.

[0003] In these traditional designs, the backrest and the seating area are typically fixed, meaning the backrest cannot rotate to accommodate the user's needs. This design restricts the user's freedom of movement when reclining, resulting in the backrest failing to provide adequate support and comfort. This fixed structure leads to fatigue and discomfort during prolonged use, severely impacting the overall user experience.

[0004] As modern office environments increasingly demand comfort and ergonomics, the design flaws of traditional office chairs are becoming more apparent. Users often need to adjust their posture to relieve stress and fatigue during daily work, but the non-adjustable backrest clearly cannot meet this need. Chinese Patent No. CN219680144U discloses a self-resetting elastic mechanism and an adaptive seat. The technical solution is as follows: "The self-resetting elastic mechanism includes: a fixed base plate; a backrest, the front end of which is hinged to the rear end of the fixed base plate; an elastic reset component located in front of the fixed base plate; and a seating portion located above the fixed base plate, with the rear end of the seating portion hinged to the middle of the backrest and the front end extending to the front of the elastic reset component." Its working principle is that "when the backrest is subjected to a backward tilting force and rotates backward, it compresses the elastic reset component, causing the elastic reset component to provide support to the backrest that adapts to the tilting angle, thereby ensuring that the backrest is always in close contact with the user's back and provides appropriate support."

[0005] However, according to basic principles of human anatomy, the human spine naturally curves in an S-shape from the lumbar region to the back. In the aforementioned patented seat design, the backrest is a single, integrated structure. This design causes the entire backrest to tilt backward when the user leans back, preventing it from providing differentiated support for different parts of the body. Specifically, the lack of independent support in the lumbar region can lead to lumbar lordosis collapse. This phenomenon causes the lumbar muscles to bear additional pressure without effective support, thus accelerating fatigue. Therefore, improving the backrest design to provide targeted support is key to enhancing seat comfort and reducing muscle fatigue. Utility Model Content

[0006] This invention overcomes the shortcomings of the prior art and provides a spring-loaded self-resetting backrest seat with a clever structure, high comfort, and reduced muscle fatigue.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] A spring-loaded self-resetting backrest seat includes a lumbar support and a backrest. A fixed cover is provided on the lumbar support, and a support member is rotatably connected to the fixed cover. The backrest is connected to the support member. A limiting space is formed between the fixed cover and the lumbar support. The lower end of the support member extends and is inserted into the limiting space. The limiting space is also provided with a reset component for pressing the support member against the backrest.

[0009] Furthermore, the support member includes a post at the upper end, a mounting plate on the back, and a mounting hole on the mounting plate, into which the post is inserted.

[0010] Furthermore, the reset component is a spring, the support is provided with a protrusion, the inner surface of the fixed cover is provided with a countersunk hole, one end of the spring is sleeved in the protrusion, and the other end of the spring is embedded in the countersunk hole.

[0011] Furthermore, the top of the insertion post is designed to be forked and open, and the top of the insertion post is spherical. The edge of the spherical shape has a snap-fit ​​position with the body of the insertion post, and the insertion hole is provided with a step position corresponding to the snap-fit ​​position.

[0012] Furthermore, it also includes a pin. The fixed cover plate is provided with a first through hole, and the support member is provided with a second through hole. When the fixed cover plate and the support member are installed together, the first through hole and the second through hole are aligned, and the pin is inserted into the first through hole and the second through hole so that the support member can rotate relative to the fixed cover plate.

[0013] Furthermore, the fixing cover plate is provided with a plurality of first screw holes for fixing to the lumbar support; the mounting plate is provided with a plurality of second screw holes for fixing to the backrest.

[0014] Furthermore, a headrest is also connected above the backrest.

[0015] Furthermore, the protruding column is cone-shaped.

[0016] Furthermore, the inner sides of the lumbar support and backrest are provided with several reinforcing support plates, and the outer sides of the lumbar support and backrest are provided with several reinforcing support patterns.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This elastic self-resetting backrest seat uses a combination of structures, including a fixed cover, support, pins, and a reset component, to movably connect the backrest to the lumbar support. This allows the backrest to rotate relative to the lumbar support as the body leans back, and the backrest returns to its original position when the body leans forward. This provides differentiated support for different parts of the back, resulting in high comfort and reduced muscle fatigue. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments of the present invention, are used to explain the present invention. They do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This utility model describes a three-dimensional elastic self-resetting backrest seat. Figure 1 ;

[0021] Figure 2 This utility model describes a three-dimensional elastic self-resetting backrest seat. Figure 2 ;

[0022] Figure 3 This is a diagram showing the lumbar support and backrest separated.

[0023] Figure 4 This is a schematic diagram showing the combined state of the fixed cover plate and support components;

[0024] Figure 5 This is a diagram showing the fixed cover plate and support component separated. Figure 1 ;

[0025] Figure 6 This is a diagram showing the fixed cover plate and support component separated. Figure 2 .

[0026] In the diagram: 1. Lumbar support; 2. Backrest; 3. Fixed cover plate; 301. Countersunk hole; 302. First through hole; 303. First screw hole; 4. Support component; 401. Insert post; 402. Protruding post; 403. Snap-fit ​​position; 404. Second through hole; 5. Reset component; 6. Mounting component; 601. Mounting hole; 6011. Step position; 602. Second screw hole; 7. Pin; 8. Headrest; 9. Reinforcing support plate; 10. Reinforcing support texture. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] like Figures 1 to 6As shown, this utility model claims protection for an elastic self-resetting backrest seat, including a lumbar support 1 and a backrest 2. The inner surfaces of the lumbar support 1 and the backrest 2 are provided with several reinforcing support plates 9, and the outer surfaces of the lumbar support 1 and the backrest 2 are provided with several reinforcing support patterns 10. The reinforcing support plates 9 and the reinforcing support patterns 10 both contribute to enhancing the overall strength and rigidity of the lumbar support 1 and the backrest 2. The seat also includes a seating structure for a person to sit on, wherein the lumbar support 1 is fixedly connected to the seating structure. When a person sits down, the lumbar support 1 corresponds to the waist position of the human body, and the backrest 2 corresponds to the back position of the human body. Cotton pads are also installed and fixed on the inner surfaces of the lumbar support 1 and the backrest 2 to enhance comfort.

[0029] The lumbar support 1 is provided with a fixing cover plate 3, which has several first screw holes 303 for fixing to the lumbar support 1. By screwing screws into the first screw holes 303 and tightening them onto the lumbar support 1, the fixing cover plate 3 is fixed to the lumbar support 1. A support member 4 is rotatably connected to the fixing cover plate 3. The fixing structure between the fixing cover plate 3 and the support member 4 includes a pin 7. The fixing cover plate 3 has a first through hole 302, and the support member 4 has a second through hole 404. When the fixing cover plate 3 and the support member 4 are installed together, the first through hole 302 and the second through hole 404 are aligned, and the pin 7 is inserted into the first through hole 302 and the second through hole 404, so that the support member 4 can rotate relative to the fixing cover plate 3.

[0030] The backrest 2 is connected to the support member 4. The support member 4 includes a pin 401 at its upper end. The backrest 2 is provided with a mounting plug 6, which has several second screw holes 602 for fixing to the backrest 2. By screwing screws into the second screw holes 602 and tightening them onto the backrest 2, the mounting plug 6 is fixed to the backrest 2. The mounting plug 6 is provided with mounting holes 601, and the pin 401 is inserted into the mounting holes 601 accordingly, thereby connecting the backrest 2 to the support member 4.

[0031] The top of the insertion post 401 is designed with a forked opening, and the top of the insertion post 401 is set in a spherical shape. The spherical design facilitates smooth insertion into the insertion hole 601. There is a snap-fit ​​position 403 between the edge of the spherical shape and the post body of the insertion post 401. The insertion hole 601 is provided with a step position 6011 corresponding to the snap-fit ​​position 403. The forked opening design at the top of the insertion post 401 is to facilitate a certain degree of compression during installation, and then insert it into the insertion hole 601. At this time, the opening opens again so that the snap-fit ​​position 403 snaps into the step position 6011 to complete the fixation.

[0032] from Figure 4As can be seen, a limiting space is formed between the fixed cover plate 3 and the waist support 1. The lower end of the support member 4 extends and is inserted into the limiting space, which allows the lower end of the support member 4 to swing. The limiting space is also provided with a reset component 5 for pressing the support member 4 against the wall. In this embodiment, the reset component 5 is a spring.

[0033] The design of this chair is that the lumbar support 1 is fixed to the seat structure to support the human's waist. When the user leans back, the backrest 2 will tilt backward relative to the lumbar support 1, and the support member 4 will rotate, causing the spring to compress. When the user leans forward, the spring will cause the support member 4 to rotate back to its original position, which also causes the backrest 2 to rotate back to its original position. This design provides differentiated support for the human's waist and back, improving seat comfort and reducing muscle fatigue.

[0034] like Figure 5 and Figure 6 As shown, to enhance the fixing effect of the spring, the support member 4 is provided with a protrusion 402, and the inner surface of the fixing cover plate 3 is provided with a countersunk hole 301. One end of the spring is sleeved in the protrusion 402, and the other end of the spring is embedded in the countersunk hole 301, which means that both ends of the spring are well fixed and are not easy to loosen. The protrusion 402 is cone-shaped, which is conducive to the installation of the spring.

[0035] As a further embodiment, a headrest 8 is also connected above the backrest 2. The headrest 8 corresponds to the head position of the human body. A connecting component can be used to connect the headrest 8 and the backrest 2 into one unit, so that the head is supported when the human body leans back, and the headrest 8 moves together with the backrest 2.

[0036] This elastic self-resetting backrest seat uses a combination of structures, including a fixed cover plate 3, a support member 4, a pin 7, and a reset component 5, to movably connect the backrest 2 to the lumbar support 1. This allows the backrest 2 to rotate relative to the lumbar support 1 when the body leans back. When the body leans forward, the backrest 2 resets under the action of the reset component 5. This provides differentiated support for different parts of the back, resulting in high comfort and reduced muscle fatigue.

[0037] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-resetting elastic backrest seat, characterized in that: It includes a lumbar support (1) and a back support (2). A fixed cover plate (3) is provided on the lumbar support (1). A support member (4) is rotatably connected to the fixed cover plate (3). The back support (2) is connected to the support member (4). A limiting space is formed between the fixed cover plate (3) and the lumbar support (1). The lower end of the support member (4) extends into the limiting space. The limiting space is also provided with a reset member (5) for pressing the support member (4) against the wall.

2. The elastic self-resetting backrest seat according to claim 1, characterized in that: The support member (4) includes a post (401) at the upper end, and a mounting plug (6) is provided on the back part (2). The mounting plug (6) is provided with a mounting hole (601), and the post (401) is inserted into the mounting hole (601).

3. The elastic self-resetting backrest seat according to claim 1, characterized in that: The reset component (5) is a spring. A protrusion (402) is provided on the support (4). A countersunk hole (301) is provided on the inner surface of the fixed cover plate (3). One end of the spring is sleeved in the protrusion (402), and the other end of the spring is embedded in the countersunk hole (301).

4. The elastic self-resetting backrest seat according to claim 2, characterized in that: The top of the insert (401) is designed as a forked opening, and the top of the insert (401) is set as a spherical shape. The edge of the spherical shape has a snap-fit ​​position (403) between it and the body of the insert (401). The insertion hole (601) is provided with a step position (6011) corresponding to the snap-fit ​​position (403).

5. The elastic self-resetting backrest seat according to claim 1, characterized in that: It also includes a pin (7), a first through hole (302) is provided on the fixed cover plate (3), and a second through hole (404) is provided on the support member (4). When the fixed cover plate (3) and the support member (4) are installed together, the first through hole (302) and the second through hole (404) are aligned, and the pin (7) is inserted into the first through hole (302) and the second through hole (404) so ​​that the support member (4) can rotate relative to the fixed cover plate (3).

6. The elastic self-resetting backrest seat according to claim 1, characterized in that: The fixed cover plate (3) is provided with a plurality of first screw holes (303) for fixing to the waist support (1); the mounting plate (6) is provided with a plurality of second screw holes (602) for fixing to the back support (2).

7. The elastic self-resetting backrest seat according to any one of claims 1 to 6, characterized in that: A headrest (8) is also connected above the backrest (2).

8. The elastic self-resetting backrest seat according to claim 3, characterized in that: The protruding post (402) is cone-shaped.

9. The elastic self-resetting backrest seat according to claim 1, characterized in that: The inner sides of the lumbar support (1) and the back support (2) are provided with several reinforcing support plates (9), and the outer sides of the lumbar support (1) and the back support (2) are provided with several reinforcing support textures (10).

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