Adjustable noon break desk and chair

Abstract

The invention provides an adjustable noon break desk and chair, and belongs to the technical field of desks and chairs, the adjustable noon break desk and chair comprises a chair body, a limiting assembly, a first control assembly and a second control assembly, the chair body comprises a seat plate and a backup plate, the backup plate is rotatably arranged on one side of the seat plate, the limiting assembly is arranged on the lower portion of the seat plate, and the limiting assembly is arranged on the lower portion of the seat plate. The first control assembly and the second control assembly are arranged on the two opposite sides of the sitting plate respectively, and the first control assembly is matched with the limiting assembly, so that the backup plate can provide support for the back of a student sitting on the sitting plate at different angles. Compared with the prior art, according to the embodiment of the invention, the backup plate can be conveniently adjusted, so that the backup plate not only can be switched between a vertical state and a laying state, but also can provide stable support for the back of a student at different vertical angles, and thus the practicability of the seat is improved.

Description

Technical Field

[0001] This invention belongs to the field of desks and chairs technology, specifically an adjustable desk and chair for lunch breaks. Background Technology

[0002] Lunch break is essential for teenagers, but classrooms are often too small to provide adequate facilities for students to take a nap. Therefore, existing chairs usually have two backrests: one upright and one reclined. When the chair back is reclined, students can lie down on the chair for a nap, while when the chair back is upright, it provides support for the student's back.

[0003] However, since the seat back only has two positions—upright and reclined—and no other angles, students can only sit in a specific posture. Over time, this can easily lead to a series of health problems such as lower back pain and stiffness. Therefore, the existing seats are not very practical and urgently need improvement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide an adjustable lunch break desk and chair.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] An adjustable desk and chair for lunch breaks includes a seat body, a limiting component, a first control component, and a second control component.

[0007] The seat body includes a seat board and a backrest, the backrest being rotatably mounted on one side of the seat board.

[0008] The limiting component is located at the lower part of the seat plate.

[0009] The first control component and the second control component are respectively disposed on opposite sides of the seat plate.

[0010] The first control component cooperates with the limiting component to enable the backrest to provide support for the back of the student sitting on the seat at different angles.

[0011] The second control component cooperates with the limiting component to allow the backing plate to rotate to a flat position.

[0012] As a further improvement of the present invention: an arc-shaped rod is fixedly provided at the bottom of the seat plate, a slot is opened on the backrest plate, one end of the arc-shaped rod away from the seat plate passes through the slot and the backrest plate, a sliding groove is provided on the arc-shaped rod, and a plurality of limiting teeth are fixedly provided at the bottom of the arc-shaped rod.

[0013] The limiting assembly includes a limiting stop bar, a limiting frame plate, and a limiting insert bar.

[0014] The limiting frame plate is slidably sleeved on the outside of the arc-shaped rod. The limiting frame plate is located on the side of the backrest plate away from the seat plate and is in contact with the side wall of the backrest plate. A connecting rod is fixedly installed on the side wall of the limiting frame plate, and the end of the connecting rod away from the limiting frame plate passes through the backrest plate through the slot.

[0015] The limiting stop is disposed on the side of the backrest facing the seat and is in contact with the side wall of the backrest. The limiting stop is installed on the upper part of the connecting rod. The limiting insert is movably disposed on the inner wall of the limiting frame plate. The upper end of the limiting insert can be inserted between two adjacent sets of limiting teeth. The first control component is used to drive the limiting insert to move up and down relative to the limiting frame plate.

[0016] As a further improvement of the present invention: support legs are fixedly provided on opposite sides of the bottom of the seat plate, a second tube is fixedly provided on the bottom of the limiting frame plate, the limiting rod is movably inserted into the upper end of the second tube, and a second flexible tube is connected to the bottom of the second tube.

[0017] The first control component includes a first slide bar, a first rack, a first handle, a first gear, a first piston rod, and a first piston tube.

[0018] The first handle is disposed on the outer side of one set of support legs. A first rotating shaft is fixedly mounted on the first handle. The end of the first rotating shaft away from the first handle passes through the set of support legs and is connected to the first gear. The first sliding rod is disposed on one side of the first gear. The first rack is mounted on the side wall of the first sliding rod and meshes with the first gear.

[0019] The first piston tube is fixedly installed on the inner wall of the support leg group. One end of the first piston rod is connected to the first slide rod, and the other end extends into the interior of the first piston rod and is in telescopic cooperation with the first piston rod. The end of the second flexible tube away from the second tube body is connected to the first piston tube.

[0020] As a further improvement of the present invention: a first stop block is fixedly provided on the inner wall of one of the legs, and one end of the first slide rod is connected to the first stop block through a first elastic element, the first elastic element being used to provide elastic support for the first slide rod.

[0021] As a further improvement of the present invention: a first tube is vertically inserted through the connecting rod, the first tube is fixedly connected to the connecting rod, the upper end of the first tube extends into the sliding groove, the limiting stop is movably inserted into the upper end of the first tube, and a first flexible tube is connected to the lower end of the first tube.

[0022] The second control assembly includes a second slide bar, a second rack, a second handle, a second gear, a second piston rod, and a second piston tube.

[0023] The second handle is located on the outside of the other set of support legs. A second rotating shaft is fixedly mounted on the second handle. The end of the second rotating shaft away from the second handle passes through the set of support legs and is connected to the second gear. The second slide rod is located on both sides of the second gear. The second rack is mounted on the side wall of the second slide rod and meshes with the second gear.

[0024] The second piston tube is fixedly installed on the inner wall of the support leg group. One end of the second piston rod is connected to the slide rod, and the other end extends into the interior of the second piston rod and is in telescopic cooperation with the second piston rod. The end of the first flexible tube away from the first tube body is connected to the second piston tube.

[0025] As a further improvement of the present invention: a second stop is fixedly provided on the inner wall of another set of support legs, and one end of the second slide rod is connected to the second stop through a second elastic element, the second elastic element being used to provide elastic support for the second slide rod.

[0026] As a further improvement of the present invention: the seat and the backrest are connected by an elastic reset member, the elastic reset member is used to provide elastic support for the backrest, and the upper end of the limiting stop bar is provided with an inclined surface on the side away from the backrest.

[0027] As a further improvement of the present invention: the first elastic element, the second elastic element, and the elastic reset element are springs or metal sheets.

[0028] As a further improvement of the present invention: a slider is slidably provided at the bottom of the seat, a support plate is hinged to the side of the seat away from the backrest, the slider and the support plate are hingedly connected by a first support rod, and a second support rod is hinged to the side of the backrest facing the seat, the end of the second support rod away from the backrest is hingedly connected to the slider.

[0029] As a further improvement of the present invention: a guide rail is fixedly provided at the bottom of the seat plate, and the slider slides in cooperation with the guide rail.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] In this embodiment of the invention, the first control component and the limiting component work together to enable the backrest to provide support for the student's back at different angles while sitting on the seat, thereby adapting to the student's different sitting posture needs. The second control component and the limiting component work together to enable the backrest to rotate to a flat position, so that the student can lie flat on the seat and the upper part of the backrest, thus allowing the student to rest conveniently. Compared with the prior art, the backrest can be easily adjusted, so that the backrest can not only switch between upright and reclined states, but also provide stable support for the student's back at different upright angles, thereby improving the practicality of the chair. Attached Figure Description

[0032] Figure 1 A schematic diagram of the structure of an adjustable desk and chair for lunch break. Figure 1 ;

[0033] Figure 2 A schematic diagram of the structure of an adjustable desk and chair for lunch break. Figure 2 ;

[0034] Figure 3 A schematic diagram of the structure of an adjustable desk and chair for lunch break. Figure 3 ;

[0035] Figure 4 for Figure 1 Enlarged view of region A in the middle;

[0036] Figure 5 for Figure 2 Enlarged view of region B in the middle;

[0037] Figure 6 for Figure 2 Enlarged diagram of region C in the middle;

[0038] Figure 7 for Figure 3 Enlarged schematic diagram of region D in the middle;

[0039] In the diagram: 10-Seat plate, 101-Elastic reset component, 102-Support leg, 103-Support plate, 104-First support rod, 105-Slider, 106-Arc rod, 107-Slide groove, 108-Limiting tooth, 109-First stop block, 110-Second stop block, 20-Backrest plate, 201-Second support rod, 202-Slot, 30-Limiting component, 301-Limiting stop rod, 302-First tube body, 303-Connecting rod, 304-First flexible tube, 305-Second flexible tube, 306-Limiting frame plate, 307-Limiting insert Rod, 308-Second tube body, 40-First control component, 401-First elastic element, 402-First slide rod, 403-First rack, 404-First handle, 405-First gear, 406-First rotating shaft, 407-First piston rod, 408-First piston tube, 50-Second control component, 501-Second elastic element, 502-Second slide rod, 503-Second rack, 504-Second handle, 505-Second gear, 506-Second rotating shaft, 507-Second piston rod, 508-Second piston tube. Detailed Implementation

[0040] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "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 invention 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 invention.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Please see Figure 1 , Figure 2 as well as Figure 3This embodiment provides an adjustable lunch break desk and chair, including a seat body, a limiting component 30, a first control component 40, and a second control component 50. The seat body includes a seat 10 and a backrest 20. The backrest 20 is rotatably disposed on one side of the seat 10. The limiting component 30 is disposed at the lower part of the seat 10. The first control component 40 and the second control component 50 are respectively disposed on opposite sides of the seat 10. The first control component 40 cooperates with the limiting component 30 to enable the backrest 20 to provide support for the back of the student sitting on the seat 10 at different angles. The second control component 50 cooperates with the limiting component 30 to enable the backrest 20 to rotate to a flat position.

[0045] The first control component 40 and the limiting component 30 work together to enable the backrest 20 to provide support for the back of the student sitting on the seat 10 at different angles, thereby adapting to the different sitting posture needs of the student. The second control component 50 and the limiting component 30 work together to enable the backrest 20 to rotate to a flat position, so that the student can lie flat on the seat 10 and the upper part of the backrest 20, thereby enabling the student to get a convenient rest.

[0046] Please see Figure 4 as well as Figure 5 In one embodiment, an arc-shaped rod 106 is fixedly provided at the bottom of the seat 10, and a slot 202 is provided on the backrest 20. The end of the arc-shaped rod 106 away from the seat 10 passes through the slot 202 and the backrest 20. A sliding groove 107 is provided on the arc-shaped rod 106, and a plurality of limiting teeth 108 are fixedly provided at the bottom of the arc-shaped rod 106. The limiting component 30 includes a limiting stop 301, a limiting frame plate 306, and a limiting insert 307. The limiting frame plate 306 is slidably sleeved on the outside of the arc-shaped rod 106. The limiting frame plate 306 is located on the side of the backrest 20 away from the seat 10 and is in contact with the side wall of the backrest 20. A connecting rod 303 is fixedly installed on the side wall of the limiting frame plate 306. The end of the connecting rod 303 away from the limiting frame plate 306 passes through the back plate 20 from the slot 202. The limiting stop rod 301 is located on the side of the back plate 20 facing the seat plate 10 and is in contact with the side wall of the back plate 20. The limiting stop rod 301 is installed on the upper part of the connecting rod 303. The limiting insertion rod 307 is movably installed on the inner wall of the limiting frame plate 306. The upper end of the limiting insertion rod 307 can be inserted between two adjacent sets of limiting teeth 108. The first control component 40 is used to drive the limiting insertion rod 307 to move up and down relative to the limiting frame plate 306.

[0047] When the angle of the backrest 20 needs to be adjusted, the first control component 40 can drive the limiting rod 307 to move downward relative to the limiting frame plate 306. The upper end of the limiting rod 307 is removed from between two adjacent sets of limiting teeth 108, and then the backrest 20 is pushed to rotate relative to the seat plate 10. When the backrest 20 rotates, it can drive the limiting frame plate 306 and the limiting stop 301 to slide synchronously along the arc-shaped rod 106. When the backrest 20 rotates to the required angle, the first control component 40 drives the limiting rod 307 to move downward relative to the seat plate 10. As the limiting frame plate 306 moves upward, the upper end of the limiting rod 307 is re-inserted between two adjacent sets of limiting teeth 108. At this time, the limiting frame plate 306 and the limiting stop rod 301 are limited on the arc rod 106 and cannot continue to slide along the arc rod 106. When the limiting frame plate 306 and the limiting stop rod 301 cannot slide, since the limiting frame plate 306 and the limiting stop rod 301 act on both sides of the backrest 20 respectively, the backrest 20 is also in a state of not being able to rotate, so that the backrest 20 can stably provide support for the student's back.

[0048] Please see Figure 1 , Figure 4 as well as Figure 6 In one embodiment, the seat 10 has legs 102 fixedly arranged on opposite sides of its bottom. A second tube 308 is fixedly arranged at the bottom of the limiting frame 306. A limiting rod 307 is movably inserted into the upper end of the second tube 308. A second flexible tube 305 is connected to the bottom of the second tube 308. The first control component 40 includes a first slide rod 402, a first rack 403, a first handle 404, a first gear 405, a first piston rod 407, and a first piston tube 408. The first handle 404 is arranged outside one set of legs 102. A first rotating shaft 406 is fixedly mounted on the first handle 404. One end of the first rod 404 passes through the set of legs 102 and is connected to the first gear 405. The first slide rod 402 is disposed on one side of the first gear 405. The first rack 403 is mounted on the side wall of the first slide rod 402 and meshes with the first gear 405. The first piston tube 408 is fixedly disposed on the inner wall of the set of legs 102. One end of the first piston rod 407 is connected to the first slide rod 402, and the other end extends into the interior of the first piston rod 408 and is in telescopic cooperation with the first piston rod 408. One end of the second flexible tube 305 away from the second tube body 308 is connected to the first piston tube 408.

[0049] When the angle of the backrest 20 needs to be adjusted, the student can pull the first handle 404. The first handle 404 drives the first rotating shaft 406 to rotate, which in turn drives the first gear 405 to rotate. Through the meshing of the first gear 405 and the first rack 403, the first sliding rod 402 is moved. When the first sliding rod 402 moves, it drives the first piston rod 407 to move out of the first piston tube 408. The first piston rod 407 draws the air inside the second tube 308 into the first piston tube 408 through the second flexible tube 305, which in turn drives the limiting rod 307 to move down, so that the upper end of the limiting rod 307 is removed from between two adjacent sets of limiting teeth 108. Then the student pushes the backrest 20, so that the backrest 20 rotates relative to the seat 10. During the rotation of the backrest 20, the limiting stop rod 301 can be moved to... The limiting frame plate 306 slides adaptively along the arc-shaped rod 106. When the backrest 20 rotates to the required angle, the student presses the first handle 404, which drives the first gear 405 to rotate in the opposite direction through the first rotating shaft 406. When the first gear 405 rotates in the opposite direction, it drives the first slide rod 402 to move in the opposite direction through the reverse meshing with the first rack 403. The first slide rod 402 drives the first piston rod 407 to move into the first piston tube 408, thereby pushing the limiting insert rod 307 upward. The upper end of the limiting insert rod 307 is re-inserted between two adjacent sets of limiting teeth 108, thereby limiting the limiting frame plate 306, the limiting stop rod 301 and the backrest 20, so that the backrest 20 can stably provide support for the student's back.

[0050] Please see Figure 6 In one embodiment, a first stop 109 is fixedly provided on the inner wall of one set of the support legs 102, and one end of the first slide rod 402 is connected to the first stop 109 through a first elastic member 401. The first elastic member 401 is used to provide elastic support for the first slide rod 402.

[0051] When the student pulls the first handle 404 and thus moves the first slide bar 402, the first elastic element 401 is compressed. After the backrest 20 rotates to the required angle, the student can release the first handle 404. At this time, the first elastic element 401 can push the first slide bar 402, causing the first slide bar 402 to move in the opposite direction on its own. This, in turn, drives the first piston rod 407 to move into the first piston tube 408, thereby causing the limiting rod 307 to move upward relative to the limiting frame plate 306, thus achieving self-limiting of the backrest 20.

[0052] Please see Figure 4 as well as Figure 7In one embodiment, a first tube 302 is vertically inserted through the connecting rod 303, and the first tube 302 is fixedly connected to the connecting rod 303. The upper end of the first tube 302 extends into the slide groove 107. The limiting stop rod 301 is movably inserted into the upper end of the first tube 302. The lower end of the first tube 302 is connected to a first flexible tube 304. The second control component 50 includes a second slide rod 502, a second rack 503, a second handle 505, a second gear 505, a second piston rod 507, and a second piston tube 508. The second handle 505 is disposed on the outside of another set of support legs 102, and a second rotating shaft 506 is fixedly installed on the second handle 505. The second rotating shaft 506, with one end away from the second handle 505, passes through the set of support legs 102 and is connected to the second gear 505. The second slide rod 502 is disposed on both sides of the second gear 505. The second rack 503 is mounted on the side wall of the second slide rod 502 and meshes with the second gear 505. The second piston tube 508 is fixedly disposed on the inner wall of the set of support legs 102. One end of the second piston rod 507 is connected to the slide rod 502, and the other end extends into the interior of the second piston rod 508 and is in telescopic cooperation with the second piston rod 508. The end of the first flexible tube 304 away from the first tube body 302 is connected to the second piston tube 508.

[0053] When the backrest 20 needs to be leveled, the student can pull the second handle 504. The second handle 504 drives the second rotating shaft 506 to rotate, which in turn drives the second gear 505 to rotate. Through the meshing of the second gear 505 and the second rack 503, the second slide rod 502 is moved. When the second slide rod 502 moves, it drives the second piston rod 507 to move outward of the second piston tube 508. The second piston rod 507 draws the air inside the first tube 302 into the second piston tube 508 through the first flexible tube 304, which in turn drives the limiting stop rod 301 to move downward. The limiting stop rod 301 moves downward to the area inside the slot 202, thereby releasing the restriction on the backrest 20. At this time, the student can rotate the backrest 20. 0, so that the backrest 20 rotates to a relatively horizontal state relative to the seat 10, thereby flattening the backrest 20 so that the student can lie down on the seat 10 and the backrest 20 to rest. When the backrest 20 is flattened, the student presses the second handle 504, which drives the second gear 505 to rotate in the opposite direction through the second rotating shaft 506. When the second gear 505 rotates in the opposite direction, it drives the second slide rod 502 to move in the opposite direction through the reverse meshing with the second rack 503. The second slide rod 502 drives the second piston rod 507 to move into the second piston tube 508, thereby pushing the air through the first flexible tube 304 into the first tube body 302 in the opposite direction, so as to push the limit stop 301 to move upward and realize the reset of the limit stop 301.

[0054] Please see Figure 7 In one embodiment, a second stop 110 is fixedly provided on the inner wall of another set of support legs 102, and one end of the second slide rod 502 is connected to the second stop 110 through a second elastic member 501. The second elastic member 501 is used to provide elastic support for the second slide rod 502.

[0055] When the student pulls the second handle 504 and moves the second slide bar 502, the second elastic element 501 is compressed. After the backrest 20 is flattened, the student can release the second handle 504. At this time, the second elastic element 501 can push the second slide bar 502, causing the second slide bar 502 to move in the opposite direction on its own. This, in turn, drives the second piston rod 507 to move into the second piston tube 508, thereby driving the limit stop bar 301 to move upward and achieving the automatic reset of the limit stop bar 301.

[0056] Please see Figure 1 as well as Figure 4 In one embodiment, the seat 10 and the backrest 20 are connected by an elastic reset member 101, which provides elastic support for the backrest 20. The upper end of the limiting stop 301 is provided with an inclined surface on the side away from the backrest 20.

[0057] When the backrest 20 needs to be folded up, the student changes from a lying position to a sitting position. At this time, the student's back is removed from the backrest 20, and the elastic reset member 101 can push the backrest 20 to rotate vertically. When the backrest 20 rotates, it slides in the opposite direction along the arc-shaped rod 106. When the backrest 20 acts on the inclined surface at the upper end of the limiting stop rod 301, it can push the limiting stop rod 301 to move downward relative to the first tube 302. When the limiting stop rod 301 moves downward, it presses the air inside the first tube 302, causing the air inside the first tube 302 to enter the second piston tube 508 from the first flexible tube 304, thereby driving the second piston tube 508. When the stop rod 507 and the second slide rod 502 move, the second elastic element 501 is compressed until the back plate 20 passes the limiting stop 301 and moves back between the limiting stop 301 and the limiting frame plate 306. Then, the second elastic element 501 pushes the second slide rod 502 to move the second piston rod 507 into the second piston tube 508, so that the air inside is reversed through the first flexible tube 304 and sent into the first tube body 302. This drives the limiting stop 301 to move upward, so that the limiting stop 301 cooperates with the limiting frame plate 306 to re-limit the back plate 20 in the position before it was flattened, thus realizing the automatic memory of the position of the back plate 20.

[0058] In one embodiment, the first elastic element 401, the second elastic element 501, and the elastic reset element 101 can be springs or metal sheets, and there is no limitation here.

[0059] Please see Figure 2 In one embodiment, a slider 105 is slidably disposed at the bottom of the seat 10, and a support plate 103 is hingedly disposed on the side of the seat 10 away from the backrest 20. The slider 105 and the support plate 103 are hingedly connected by a first support rod 104. A second support rod 201 is hingedly disposed on the side of the backrest 20 facing the seat 10, and the end of the second support rod 201 away from the backrest 20 is hingedly connected to the slider 105.

[0060] During the process of lowering the backrest 20, the backrest 20 can push the slider 105 via the second support rod 201, causing the slider 105 to slide along the bottom of the seat 10. When the slider 105 slides, it pushes the support plate 103 via the first support rod 104, causing the support plate 103 to rotate relative to the seat 10. When the support plate 103 rotates, it extends from the bottom of the seat 10 and maintains an inclined posture, thereby providing support for the student's legs and improving the comfort of the student when lying down to rest. When the backrest 20 is retracted, the backrest 20 pulls the slider 105 via the second support rod 201, causing the slider 105 to slide in the opposite direction along the bottom of the seat 10. When the slider 105 slides in the opposite direction, it pulls the support plate 103 via the first support rod 104, causing the support plate 103 to rotate in the opposite direction relative to the seat 10 to the area below the seat 10, thus realizing the retraction of the support plate 103.

[0061] In one embodiment, a guide rail is fixedly provided at the bottom of the seat plate 10, and the slider 105 slides in cooperation with the guide rail.

[0062] In this embodiment of the invention, the first control component 40 and the limiting component 30 cooperate to enable the backrest 20 to provide support for the back of the student sitting on the seat 10 at different angles, thereby adapting to the different sitting posture needs of the student. The second control component 50 and the limiting component 30 cooperate to enable the backrest 20 to rotate to a flat state, so that the student can lie flat on the seat 10 and the backrest 20, thereby enabling the student to rest conveniently. Compared with the prior art, the backrest 20 can be conveniently adjusted, so that the backrest 20 can not only switch between upright and reclined states, but also provide stable support for the student's back at different upright angles, thereby improving the practicality of the chair.

[0063] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by students of ordinary skill in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An adjustable desk and chair for lunch break, characterized in that, It includes a seat body, a limiting component (30), a first control component (40), and a second control component (50). The seat body includes a seat plate (10) and a backrest (20), the backrest (20) being rotatably disposed on one side of the seat plate (10). The limiting component (30) is disposed at the lower part of the seat plate (10). The first control component (40) and the second control component (50) are respectively disposed on opposite sides of the seat plate (10). The first control component (40) cooperates with the limiting component (30) to enable the backrest (20) to provide support for the back of the student sitting on the seat (10) at different angles. The second control component (50) cooperates with the limiting component (30) to enable the backrest (20) to rotate to a flat position.

2. The adjustable desk and chair for lunch break according to claim 1, characterized in that, An arc-shaped rod (106) is fixedly installed at the bottom of the seat plate (10). A slot (202) is opened on the backrest plate (20). The end of the arc-shaped rod (106) away from the seat plate (10) passes through the backrest plate (20) through the slot (202). A sliding groove (107) is opened on the arc-shaped rod (106). Several limiting teeth (108) are fixedly installed at the bottom of the arc-shaped rod (106). The limiting component (30) includes a limiting stop (301), a limiting frame plate (306), and a limiting insert (307). The limiting frame plate (306) is slidably sleeved on the outside of the arc-shaped rod (106). The limiting frame plate (306) is located on the side of the backrest plate (20) away from the seat plate (10) and is in contact with the side wall of the backrest plate (20). A connecting rod (303) is fixedly provided on the side wall of the limiting frame plate (306). The end of the connecting rod (303) away from the limiting frame plate (306) passes through the backrest plate (20) from the slot (202). The limiting stop (301) is disposed on the side of the backrest (20) facing the seat (10) and is in contact with the side wall of the backrest (20). The limiting stop (301) is installed on the upper part of the connecting rod (303). The limiting insert (307) is movably disposed on the inner wall of the limiting frame plate (306). The upper end of the limiting insert (307) can be inserted between two adjacent sets of limiting teeth (108). The first control component (40) is used to drive the limiting insert (307) to move up and down relative to the limiting frame plate (306).

3. The adjustable desk and chair for lunch break according to claim 2, characterized in that, The seat (10) has legs (102) fixedly installed on opposite sides of its bottom. The bottom of the limiting frame (306) has a second tube (308) fixedly installed. The limiting rod (307) is movably inserted into the upper end of the second tube (308). The bottom of the second tube (308) is connected to a second flexible tube (305). The first control component (40) includes a first slide bar (402), a first rack (403), a first handle (404), a first gear (405), a first piston rod (407), and a first piston tube (408). The first handle (404) is disposed on the outside of one set of the support legs (102). A first rotating shaft (406) is fixedly mounted on the first handle (404). The end of the first rotating shaft (406) away from the first handle (404) passes through the set of support legs (102) and is connected to the first gear (405). The first slide rod (402) is disposed on one side of the first gear (405). The first rack (403) is mounted on the side wall of the first slide rod (402) and meshes with the first gear (405). The first piston tube (408) is fixedly disposed on the inner wall of the support leg (102) of the group. One end of the first piston rod (407) is connected to the first slide rod (402), and the other end extends into the interior of the first piston rod (408) and is in telescopic cooperation with the first piston rod (408). The end of the second flexible tube (305) away from the second tube body (308) is connected to the first piston tube (408).

4. The adjustable desk and chair for lunch break according to claim 3, characterized in that, A first stop (109) is fixedly provided on the inner wall of one of the legs (102). One end of the first slide rod (402) is connected to the first stop (109) through a first elastic element (401). The first elastic element (401) is used to provide elastic support for the first slide rod (402).

5. The adjustable desk and chair for lunch break according to claim 4, characterized in that, A first tube (302) is vertically inserted through the connecting rod (303), and the first tube (302) is fixedly connected to the connecting rod (303). The upper end of the first tube (302) extends into the sliding groove (107). The limiting stop (301) is movably inserted into the upper end of the first tube (302), and the lower end of the first tube (302) is connected to a first flexible tube (304). The second control assembly (50) includes a second slide bar (502), a second rack (503), a second handle (505), a second gear (505), a second piston rod (507), and a second piston tube (508). The second handle (505) is disposed on the outside of another set of support legs (102). A second rotating shaft (506) is fixedly mounted on the second handle (505). The end of the second rotating shaft (506) away from the second handle (505) passes through the set of support legs (102) and is connected to the second gear (505). The second slide rod (502) is disposed on both sides of the second gear (505). The second rack (503) is mounted on the side wall of the second slide rod (502) and meshes with the second gear (505). The second piston tube (508) is fixedly installed on the inner wall of the support leg (102) of the group. One end of the second piston rod (507) is connected to the slide rod (502), and the other end extends into the interior of the second piston rod (508) and is telescopically engaged with the second piston rod (508). The end of the first flexible tube (304) away from the first tube body (302) is connected to the second piston tube (508).

6. The adjustable desk and chair for lunch break according to claim 5, characterized in that, Another set of support legs (102) has a second stop (110) fixedly installed on the inner wall. One end of the second slide rod (502) is connected to the second stop (110) through a second elastic member (501). The second elastic member (501) is used to provide elastic support for the second slide rod (502).

7. The adjustable desk and chair for lunch break according to claim 6, characterized in that, The seat (10) and the backrest (20) are connected by an elastic reset member (101), which provides elastic support for the backrest (20). The upper end of the limiting stop (301) is provided with an inclined surface on the side away from the backrest (20).

8. The adjustable desk and chair for lunch break according to claim 7, characterized in that, The first elastic element (401), the second elastic element (501), and the elastic reset element (101) are springs or metal sheets.

9. The adjustable desk and chair for lunch break according to claim 1, characterized in that, A slider (105) is slidably disposed at the bottom of the seat (10). A support plate (103) is hinged to the side of the seat (10) away from the backrest (20). The slider (105) and the support plate (103) are hingedly connected by a first support rod (104). A second support rod (201) is hinged to the side of the backrest (20) facing the seat (10). The end of the second support rod (201) away from the backrest (20) is hingedly connected to the slider (105).

10. An adjustable desk and chair for lunch break according to claim 9, characterized in that, The bottom of the seat plate (10) is fixedly provided with a guide rail, and the slider (105) slides in cooperation with the guide rail.

Images