Modular lunch desk

Abstract

The application discloses a modular lunch desk and chair and relates to the technical field of desks and chairs, which comprises two chair legs and two desk legs, the top of each of the two chair legs is fixedly connected with a fixing rod through a bolt, the top of each of the two fixing rods is fixedly connected with a fixing table, the top of each of the two fixing rods is rotatably connected with a rotating frame, one side of the rotating frame close to the fixing table is fixedly connected with a chair back, and the two ends of the rotating frame are both inserted through the side of the two fixing rods away from each other. Through the adjustable chair surface, students with small body shapes can adjust the chair surface to the side of the chair back, so that the waist and back of the students are supported by the chair back, the students are prevented from leaning forward, students with large body shapes can adjust the chair surface to the side away from the chair back, the thighs of the students are fully supported, the students are prevented from being pressed in the popliteal fossa, different students with different body shapes can be accurately matched, the bad sitting posture of the students is effectively corrected, the risk of inducing the spinal strain and myopia is reduced, and the general adaptability and the long-sitting comfort of the desk and chair are improved.

Description

Technical Field

[0001] This invention relates to the field of desks and chairs technology, and more specifically, to a modular desk and chair for lunch break. Background Technology

[0002] With the advancement of policies supporting lunchtime rest in primary and secondary schools, desks and chairs with reclining functions are gradually gaining widespread use. These desks and chairs consist of a desk and a chair. During normal teaching, the desk serves as a writing surface for books, while the chair maintains an upright backrest to support students' proper posture. The desks and chairs can be freely moved and arranged according to classroom layout and row spacing requirements, adapting to various scenarios such as classroom interaction and daily cleaning duties. During lunch break, students release the chair back locking mechanism and tilt the chair back to a reclining position, creating a semi-reclining support. Some models also allow the desktop to be tilted upwards simultaneously to reduce legroom. Combined with leg rests at the bottom of the desk, this enables a seamless transition from a seated teaching position to a semi-reclining nap.

[0003] However, existing desks and chairs for lunch breaks still have many technical limitations in practical application. The seat depth is mostly fixed and non-adjustable, making it impossible to adapt to different student body shapes. Smaller students have difficulty getting adequate back support, leading to unconscious forward leaning and increased eye strain. Larger students lack sufficient support for their thighs, causing prolonged pressure on the popliteal fossa, which can impede blood circulation in the lower limbs and easily induce spinal strain and poor posture over time. Furthermore, the lack of a rigid connection between the desk and chair makes them prone to sliding and shifting when lying down during lunch breaks. Individually designed chairs also pose a safety hazard when the backrest is adjusted, as they may tilt backward. In addition, the desktops of existing products often only tilt upwards to create legroom, requiring items to be moved and stored before lunch breaks, a cumbersome process that reduces effective rest time. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a modular lunch break desk and chair.

[0005] The technical solution is as follows:

[0006] A modular lunch break desk and chair includes two chair legs and two table legs. The top of each chair leg is fixedly connected to a fixing rod by bolts. The top of the two fixing rods is fixedly connected to a fixed platform. A rotating frame is rotatably connected between the tops of the two fixing rods. A chair back is fixedly connected to the side of the rotating frame near the fixed platform. Both ends of the rotating frame pass through the opposite sides of the two fixing rods. Locking modules are provided at both ends of the rotating frame passing through the two fixing rods. Lifting tubes are slidably connected to each table leg. The top of the two lifting tubes is provided with a tabletop. A table drawer is fixedly connected to the lower surface of the tabletop. An adjustment component for adjusting the student's sitting position is provided on the fixed platform.

[0007] The adjustment assembly includes T-shaped bars that are fixedly connected to the fixed platform and arranged in a linear array. The fixed platform is provided with a chair seat. The lower surface of the chair seat has multiple T-shaped grooves arranged in a linear array. An assembly assembly for connecting the chair legs and the table legs is provided between the two chair legs and the two table legs.

[0008] The assembly includes two foot pads 1 fixedly connected to the two chair legs near the table legs. The two foot pads 1 are fixedly connected to tenons on the side away from the chair legs. The two table legs are fixedly connected to two foot pads 2 on the side away from the chair legs. The two foot pads 2 are provided with mortises on the side away from the table legs. The chair legs and table legs on the same side are jointly provided with a linkage component for lowering the tabletop. The two lifting tubes are provided with translation components for moving the tabletop.

[0009] The translation component includes two guide rails fixedly connected to the top of two lifting tubes. Each guide rail is slidably connected to a sliding frame. Each sliding frame is fixedly connected to a spring three between itself and the two guide rails. The bottom of the tabletop is fixedly connected to the two sliding frames by bolts.

[0010] Furthermore, both chair legs and both table legs are designed in an L-shape, and the interior of both chair legs and both table legs is hollow.

[0011] Furthermore, the seat surface consists of a base plate and a panel, wherein the panel of the seat surface is designed to be curved upwards towards the side away from the backrest.

[0012] Furthermore, the tenon is trapezoidal in shape, and the mortise is shaped to match the tenon.

[0013] Furthermore, the linkage assembly includes two cross-link groups disposed on a section of the rotating frame located inside the chair leg. The bottom of the two cross-link groups is rotatably connected to a movable plate. A winding wheel is rotatably connected to the top of the inner cavity of the chair leg. A pull rope is fixedly connected to the upper surface of the movable plate. A hook is fixedly connected to the end of the pull rope near the foot pad cover. A sliding groove is fixedly connected to the side wall of the chair leg. A second winding wheel is rotatably connected inside the chair leg. A spring is fixedly connected to the bottom of the lifting tube. The bottom of the spring is fixedly connected to the inner wall of the chair leg. A movable groove is formed at the bottom of the lifting tube, and the top of the inner side of the movable groove is fixedly connected to... There is a second spring, and a movable tube is fixedly connected to the bottom of the second spring. A movable frame is fixedly connected to the bottom of the movable tube. Sloping grooves are opened on both sides of the movable frame. Slots are opened on both sides of the bottom of the lifting tube. A locking block is slidably connected inside the two slots. A sliding rod is fixedly connected to the end of the locking block that is close to each other. The two sliding rods slide inside the sloping grooves respectively. A slot is opened on both sides of the top of the table leg. The ends of the two locking blocks that are far apart from each other are inserted into the two slots. A second pull rope is fixedly connected to the bottom of the movable frame. A second hook block is fixedly connected to the end of the second pull rope that is close to the second foot pad. A third winding wheel is rotatably connected inside the table leg.

[0014] Furthermore, the movable plate slides inside the chair leg, and a hole is opened in the middle of the movable plate. The first pull rope goes up and around the first winding wheel, and then the first pull rope goes down diagonally through the hole in the movable plate from the surface of the first winding wheel. After going around the second winding wheel, the first pull rope extends horizontally towards the side near the first foot pad. The movable groove is composed of a cylindrical groove and a square groove. The movable tube slides inside the cylindrical groove of the movable groove, and the movable frame slides inside the square groove of the movable groove. Both slots are connected to the square groove of the movable groove. The two slots correspond to the positions of the locking slots. The locking slots are adapted to the shape of the locking blocks. The second pull rope goes down and around the third winding wheel, and then extends horizontally towards the side near the second foot pad. The second hook block and the first hook block fit together. A groove is opened at the bottom of the tenon.

[0015] Furthermore, the translation assembly also includes two vertical plates fixedly connected to the lower surface of the sliding frame located outside the guide rail frame. The surface of one vertical plate of the sliding frame closer to the guide rail frame has multiple threaded holes arranged in a linear array. The surface of one vertical plate of the sliding frame away from the guide rail frame has an adjustment groove. A screw slides inside the adjustment groove. A shaft is fixedly connected to the bottom outer surface of the lifting tube. A telescopic rod is rotatably connected to the outer surface of the shaft. A strip groove is opened on the outer surface of the table leg. A limit wheel is rotatably connected to the outer surface of the table leg.

[0016] Furthermore, the shaft extends through the strip groove to the outside of the table leg, and the top of the telescopic rod's telescopic shaft is located between the two vertical plates of the sliding frame. A hole is opened at the top of the telescopic rod's telescopic shaft, and a screw passes through the hole of the telescopic rod and is threaded into the threaded hole.

[0017] Based on the above, the beneficial effects of the modular lunch break desk and chair of the present invention are as follows:

[0018] With its adjustable seat, smaller students can adjust the seat towards the backrest, allowing their lower back to be supported and preventing them from leaning forward on the desk. Larger students can adjust the seat away from the backrest, ensuring their thighs are fully supported and preventing pressure on their knees. It can precisely fit students of different body types, effectively correcting their poor posture, reducing the risk of spinal strain and myopia, and improving the universality and comfort of desks and chairs.

[0019] By assembling components, the chair legs and table legs are combined to ensure that the desks and chairs are aligned and locked during lunch breaks, improving the continuity of lying support and structural rigidity, avoiding the risk of slippage and tipping over, and the connection can be quickly disconnected during daily use, allowing the desks and chairs to be used independently, maintaining the flexibility of classroom layout, adapting to multiple scenarios, and improving the safety and comfort of use.

[0020] By adjusting the tilt angle of the chair back, the desktop can be moved downwards. The desktop, after moving downwards, can act as a leg support for the student's legs, realizing one-step adjustment of the lunch break posture, simplifying the operation process, constructing a continuous support system for the head, back, waist and legs, maintaining the physiological curvature of the spine, relieving poor blood flow in the lower limbs, and improving the comfort and convenience of using the desk and chair for lunch break without the need for additional leg support components.

[0021] The desktop can move downwards in tandem, and when the chair back is tilted, the desktop is simultaneously driven to move downwards and move away from the chair surface. The distance of the movement can be adjusted according to the student's height, effectively expanding the range of support for the legs and adapting to the differences in leg length among students of different heights. This ensures that the desktop can support the student's lower limbs, keeping the spine straight and improving the product's adaptability to students' heights and the comfort of lunch break. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall components of the present invention;

[0023] Figure 2 This is a three-dimensional cross-sectional view of the chair legs, table legs, and other components of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of component A in the middle;

[0025] Figure 4 This is a three-dimensional schematic diagram of the rotating frame, cross linkage, and other components of the present invention;

[0026] Figure 5 This is a three-dimensional schematic diagram of the components of the present invention, including the cross linkage assembly, pull rope, and winding wheel.

[0027] Figure 6 This is a three-dimensional schematic diagram of the T-shaped strip, T-shaped groove, and other components of the present invention;

[0028] Figure 7 For the present invention Figure 2 Enlarged schematic diagram of component at point B;

[0029] Figure 8 This is a three-dimensional cross-sectional view of the pull rope 1, pull rope 2, and other components of the present invention;

[0030] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of component at point C;

[0031] Figure 10 This is a three-dimensional schematic diagram of the table legs, tabletop, and other components of the present invention;

[0032] Figure 11 For the present invention Figure 2 Enlarged schematic diagram of component at point D;

[0033] Figure 12 This is a three-dimensional schematic diagram of the components of the present invention, including the threaded hole, adjusting groove, screw, telescopic rod, and limiting wheel.

[0034] Figure 13 This is a three-dimensional schematic diagram of the guide rail frame, sliding frame, and spring components of the present invention;

[0035] Figure 14 This is a cross-sectional perspective of the sliding frame, telescopic rod, screws, and other components of the present invention.

[0036] The reference numerals in the appendix of this invention are as follows:

[0037] 1. Chair legs; 11. Fixing rod; 12. Fixing platform; 13. Rotating frame; 14. Chair back; 15. Locking module; 3. Table legs; 31. Lifting tube; 32. Tabletop; 33. Table drawer;

[0038] 21. T-shaped strip; 22. Chair seat; 23. T-shaped groove

[0039] 41. Foot pad cover one; 42. Tenon; 43. Foot pad cover two; 44. Mortise and tenon;

[0040] 51. Cross linkage assembly; 52. Movable plate; 53. Winding reel one; 54. Pull rope one; 55. Hook block one; 56. Slide rail; 57. Winding reel two; 58. Spring one; 59. Movable groove; 510. Spring two; 511. Movable tube; 512. Movable frame; 513. Inclined groove; 514. Slot; 515. Locking block; 516. Slide rod; 517. Locking groove; 518. Pull rope two; 519. Hook block two; 520. Winding reel three;

[0041] 61. Guide rail bracket; 62. Sliding bracket; 63. Spring 3; 64. Threaded hole; 65. Adjusting groove; 66. Telescopic rod; 67. Screw; 68. Shaft; 69. Strip groove; 610. Limiting wheel. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] The embodiments provided by the present invention will be described in detail below:

[0044] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 10 and Figure 12 As shown, a modular lunch break desk and chair includes two chair legs 1 and two table legs 3. The tops of the two chair legs 1 are fixedly connected to the fixing rods 11 by bolts. The tops of the two fixing rods 11 are fixedly connected to the fixing platform 12. The tops of the two fixing rods 11 are rotatably connected to the rotating frame 13. The side of the rotating frame 13 near the fixing platform 12 is fixedly connected to the chair back 14. Both ends of the rotating frame 13 pass through the opposite sides of the two fixing rods 11. Locking modules 15 are provided at both ends of the rotating frame 13 passing through the two fixing rods 11. Lifting tubes 31 are slidably connected to the two table legs 3. The tops of the two lifting tubes 31 are jointly provided with the desktop 32. The lower surface of the desktop 32 is fixedly connected to the table drawer 33. The fixing platform 12 is provided with an adjustment component for adjusting the student's sitting position.

[0045] It should be noted that both chair legs 1 and both table legs 3 are L-shaped, and the interior of both chair legs 1 and both table legs 3 is hollow. The locking module 15 is an existing structure, that is, when the rotating frame 13 rotates between the two fixed rods 11, the state of the rotating frame 13 after rotation can be locked by the locking module 15.

[0046] The adjustment assembly includes T-shaped bars 21 that are fixedly connected to the fixed platform 12 and arranged in a linear array. The fixed platform 12 is provided with a seat surface 22, and the lower surface of the seat surface 22 is provided with a plurality of T-shaped grooves 23 arranged in a linear array.

[0047] It should be noted that the seat 22 consists of a base plate and a panel. The panel of the seat 22 is designed to be tilted away from the backrest 14, so that when a student sits on the seat 22, the student can slide towards the backrest 14, preventing the student from sliding off the panel of the seat 22 away from the backrest 14.

[0048] Specifically, when students are taking a lunch break, they can lock the rotating frame 13 by contacting the locking module 15. Then, the students can hold the backrest 14 and pull it away from the seat 22. The backrest 14 will cause the rotating frame 13 to rotate around the axis of the rotating connection with the chair leg 1. After the rotating frame 13 rotates to a certain tilt angle, the locking module 15 can lock the rotating frame 13 in the rotated state, so that the backrest 14 is locked. Then, the students can sit on the seat 22 and lean back against the backrest 14 to take a lunch break.

[0049] The existing desks and chairs have fixed seat surfaces 22. However, for students of different sizes, the existing seat surfaces 22 cannot accommodate students of different sizes. For larger students, the seat surface 22 cannot be fully seated, and the lack of support for the front of the student's thighs will lead to uneven force and soft tissue injury. For smaller students, the back cannot be pressed against the backrest 14, and the student's waist is always suspended, which will force the lumbar spine to bend and cause lumbar muscle strain. To address this, the position of the seat 22 can be adjusted for students of different body types. For larger students, the seat 22 can be pushed so that it slides out of the T-shaped groove 23 onto the T-shaped strip 21. Then, the seat 22 can be moved away from the backrest 14 and the T-shaped groove 23 and T-shaped strip 21 can be aligned and slid together again. This allows the seat 22 to be reinstalled on the fixed platform 12. When a larger student sits on the reinstalled seat 22, their buttocks will be further away from the backrest 14, providing more space for them. This allows the seat 22 to effectively support their legs so that their lower back can be close to the backrest 14. For smaller students, the seat 22 can be installed closer to the backrest 14. This allows their buttocks to be closer to the backrest 14, enabling them to sit with their back close to the backrest 14. With the adjustable seat 22, smaller students can adjust the seat 22 towards the backrest 14, so that the student's back is supported by the backrest 14, preventing the student from leaning forward on the table. Larger students can adjust the seat 22 away from the backrest 14, so that the student's thighs are fully supported, preventing the student's popliteal fossa from being compressed. It can accurately adapt to students of different body shapes, effectively correct students' bad sitting posture, reduce the risk of spinal strain and myopia, and improve the universal adaptability of the table and chair and the comfort of sitting for a long time.

[0050] It should be noted that when using this product for younger students, the teacher can adjust the operation.

[0051] like Figure 1 , Figures 4 to 6 , Figures 9 to 12 As shown, an assembly component for connecting the chair legs 1 and the table legs 3 is provided between the two chair legs 1 and the two table legs 3. The assembly component includes two foot pads 41 fixedly connected to the ends of the two chair legs 1 near the table legs 3. The side of each foot pad 41 away from the chair legs 1 is fixedly connected to a tenon 42. The side of each table leg 3 near the chair legs 1 is fixedly connected to a foot pad 43. The side of each foot pad 43 away from the table legs 3 is provided with a mortise 44.

[0052] It should be noted that the tenon 42 is trapezoidal in shape, and the mortise 44 is shaped to match the tenon 42.

[0053] Specifically, the existing chair back 14 can be adjusted for lunch break, but because the chair and desk are separate, the distance between the chair and desk needs to be manually aligned again after adjusting the chair. In addition, the center of the separate chair shifts after the chair back 14 is tilted, which can cause instability when students lie down. The integrated desk and chair are too bulky and difficult to move during daily cleaning, classroom layout adjustment and seat changes. Before adjusting the chair back 14 to tilt for lunch break, students can bring the two chair legs 1 close to the two table legs 3. The two chair legs 1 will align the tenon 42 with the mortise 44 through the foot pad 1 41. The foot pad 1 41 will then guide the tenon 42 to slide down into the mortise 44. After the tenon 42 slides into the mortise 44, the chair leg 1 and the table leg 3 will be joined together, forming a whole. After lunch break, if it is necessary to disconnect the chair leg 1 and the table leg 3, the chair leg 1 can be pulled. The chair leg 1 will then move the tenon 42 upwards inside the mortise 44 through the foot pad 1 41 until the tenon 42 slides out of the mortise 44, thus disconnecting the chair leg 1 and the table leg 3. By assembling the components, the combination of chair leg 1 and table leg 3 allows the desk and chair to be aligned and locked during lunch break, improving the continuity of lying support and structural rigidity, avoiding the risk of slippage and tipping over. The connection can be quickly disconnected during daily use, allowing the desk and chair to be used independently, maintaining the flexibility of classroom layout, adapting to multiple scenarios, and improving the safety and comfort of use.

[0054] like Figures 2 to 5 , Figures 7 to 9 , Figure 11As shown, the chair leg 1 and table leg 3 on the same side are equipped with a linkage component for lowering the tabletop 32. The linkage component includes two cross linkage groups 51 located on a section of the rotating frame 13 inside the chair leg 1. The bottom of the two cross linkage groups 51 is rotatably connected to a movable plate 52. A winding wheel 53 is rotatably connected to the top of the inner cavity of the chair leg 1. A pull rope 54 is fixedly connected to the upper surface of the movable plate 52. A hook block 55 is fixedly connected to the end of the pull rope 54 near the foot pad cover 41. A sliding groove 56 is fixedly connected to the side wall of the chair leg 1. A winding wheel 57 is rotatably connected to the inside of the chair leg 1. A spring 58 is fixedly connected to the bottom of the lifting tube 31. The bottom of the spring 58 is fixedly connected to the inner wall of the table leg 3. A movable groove 59 is opened at the bottom of the lifting tube 31. The top of the inner side of the movable groove 59 is fixedly connected to... There is a second spring 510, and a movable tube 511 is fixedly connected to the bottom of the second spring 510. A movable frame 512 is fixedly connected to the bottom of the movable tube 511. Sloping grooves 513 are opened on both sides of the movable frame 512. Slots 514 are opened on both sides of the bottom of the lifting tube 31. A locking block 515 is slidably connected inside the two slots 514. A sliding rod 516 is fixedly connected to the end of the locking block 515 that is close to each other. The two sliding rods 516 slide inside the sloping grooves 513 respectively. A slot 517 is opened on both sides of the top of the table leg 3. The ends of the two locking blocks 515 that are far from each other are inserted into the two slots 517. A second pull rope 518 is fixedly connected to the bottom of the movable frame 512. A hook block 519 is fixedly connected to the end of the pull rope 518 that is close to the foot pad sleeve 43. A winding wheel 520 is rotatably connected inside the table leg 3.

[0055] It should be noted that, referring to Figure 4 As shown, the top two connecting rods of the cross linkage assembly 51 are connected in two ways: one is fixedly connected to the rotating frame 13, and the other is rotatably connected to the rotating frame 13. This allows the cross linkage assembly 51 to unfold during the rotation of the rotating frame 13. The movable plate 52 slides inside the chair leg 1. A hole is provided in the middle of the movable plate 52. A pull rope 54 winds upwards around a winding wheel 53, then passes diagonally downwards through the hole in the movable plate 52 from the surface of the winding wheel 53. After passing around a second winding wheel 57, the pull rope 54 extends horizontally towards the side near the foot pad cover 41. The movable groove 59 consists of a cylindrical groove and a square groove. The movable tube 511 slides inside the cylindrical groove of the movable slot 59, the movable frame 512 slides inside the square groove of the movable slot 59, the two slots 514 are connected to the square groove of the movable slot 59, the two slots 514 correspond to the position of the slot 517, the slot 517 is adapted to the shape of the block 515, the second pull rope 518 extends horizontally towards the side close to the foot pad sleeve 43 after passing down the winding wheel 3 520, the second hook block 519 and the first hook block 55 are interlocked, and the bottom of the tenon 42 is provided with a groove so that the tenon 42 will not be blocked by the second hook block 519 after sliding into the mortise 44 from top to bottom.

[0056] Specifically, after adjusting the backrest 14 of the existing desks and chairs, the desktop 32 and the drawer 33 need to be adjusted simultaneously to facilitate the placement of students' legs. That is, the desktop 32 and the drawer 33 need to be tilted towards the backrest 14. However, in the classroom, students' books and stationery are placed on the desktop 32 and in the drawer 33. The adjusted desktop 32 and drawer 33 are not convenient for placing books and stationery. This requires students to place their books and stationery in a separate area for storage, which is time-consuming and laborious. To ensure the normal use of the drawer 33, when adjusting the tilt angle of the chair back 14, the rotating frame 13 rotates between the two chair legs 1. The section of the rotating frame 13 located inside the chair legs 1 drives the cross linkage assembly 51 to extend downwards. The cross linkage assembly 51, through geometric displacement amplification and the combined effect of multiple interconnected sections, allows for a significant increase in linear displacement even with a small angular rotation as the angle changes from large to small. Especially in the near-fully extended range, a small input angular displacement corresponds to a large output linear displacement. This is a natural amplification effect inherent in geometry. Combined with the interconnected multiple sections, this allows the end to output a linear motion of several times its length. Thus, the small-angle rotation of the rotating frame 13, through the cross linkage... Group 51 can amplify the linear motion distance. During the unfolding of the cross linkage group 51, it drives the movable plate 52 to move downwards a long distance inside the chair leg 1. The movable plate 52 pulls the pull rope 54 downwards simultaneously. Because the pull rope 54 passes around the winding wheel 53, the end of the pull rope 54 that passes around the winding wheel 53 will move upwards. At this time, the pull rope 54 will drive the hook block 55 to slide away from the foot pad cover 41 on the sliding groove strip 56. During the movement of the pull rope 54, the winding wheel 57 will rotate. The winding wheel 57 can prevent friction between the pull rope 54 and the chair leg 1. The sliding of the hook block 55 will drive the hook block 519 that is hooked to it to move closer to the foot pad cover 41. Figure 9As shown, when hook block 1 55 continues to move, it will directly drive hook block 2 519 into the interior of chair leg 1. At this time, hook block 2 519 will drive pull rope 2 518 to move synchronously. During the movement, pull rope 2 518 will drive winding wheel 3 520 to rotate. Winding wheel 3 520 can prevent friction between pull rope 2 518 and table leg 3. The section of pull rope 2 518 that passes over winding wheel 3 520 will move downward. Pull rope 2 518 will pull the movable frame 512 downward inside the square groove of movable slot 59. The movable frame 512 drives the movable tube 511 to move synchronously downwards inside the cylindrical groove of the movable slot 59. The downward movement of the movable tube 511 stretches the second spring 510. The downward-moving movable frame 512 pushes the two slide rods 516 through the two inclined slots 513, causing the two slide rods 516 to drive the two locking blocks 515 to move closer to each other inside the slot 514. When the two locking blocks 515 move closer to each other, they are no longer engaged with the locking slot 517. After the locking blocks 515 are disengaged from the locking slot 517, The lifting tube 31 is no longer restricted, and the movable frame 512 will move to the bottom of the square groove of the movable slot 59. At this time, the movable frame 512 cannot continue to move downward inside the movable slot 59. When the second pull rope 518 continues to move downward, it will directly use the movable frame 512 in conjunction with the movable slot 59 to make the lifting tube 31 slide downward inside the table leg 3. When the lifting tube 31 slides downward, it will compress the first spring 58. At the same time, the lifting tube 31 will make the tabletop 32 move downward synchronously. The tabletop 32 will drive the table drawer 33 to move downward synchronously. When the lifting tube 31 moves the tabletop 32 to the lowest position, the tabletop 32 will be lowered to a position where students can place their legs. Adjusting the tilt angle of the chair back 14 can link the tabletop 32 to move downward. After moving downward, the tabletop 32 can act as a leg support for students' legs. It realizes one-step adjustment of the lunch break posture, simplifies the operation process, builds a continuous support system for the head, back, waist and legs, maintains the physiological curvature of the spine, relieves poor blood flow in the lower limbs, and improves the comfort and convenience of using the desk and chair for lunch break without the need for additional leg support components.

[0057] After lunch break, students can unlock the locking module 15 and then turn the chair back 14 to make the rotating frame 13 rotate in the opposite direction around the axis of rotational connection with the chair leg 1. During the reverse rotation of the rotating frame 13, the cross linkage group 51 retracts and folds upward. The cross linkage group 51 drives the movable plate 52 to move upward. The movable plate 52 no longer pulls the pull rope 54. Under the elastic reset action of the spring 58, the lifting tube 31 moves upward. After the lifting tube 31 moves upward to the highest position, the slot 514 on it corresponds to the slot 517. At this time, the lifting tube 31 drives the movable frame 512 to move upward synchronously through the movable slot 59. The movable frame 512 pulls the pull rope 518 to move upward synchronously. At this time, the pull rope 518 drives the hook block 519 to move towards the side closer to the table leg 3. The hook block 519 drives the hook block 55 to move towards the side closer to the foot pad cover 41 inside the slide strip 56. Because the movable plate 52 no longer pulls the pull rope 54, the lifting tube 31 moves upward. 4. When a pulling force is applied, the first pull rope 54 no longer applies a pulling force to the second pull rope 518 via the first hook block 55. At this time, the second pull rope 518 no longer applies a pulling force to the movable frame 512. Under the elastic reset action of the second spring 510, the movable tube 511 moves upward in the cylindrical groove of the movable slot 59. The movable tube 511 drives the movable frame 512 to move upward in the directional groove of the movable slot 59. After the movable frame 512 moves upward, it pushes the two slide rods 516 through the two inclined grooves 513, causing the two slide rods 516 to drive the two locking blocks 515 to move towards the inside of the slot 517 inside the slot 514. At this time, the locking blocks 515 are inserted into the inside of the slot 517, thereby locking the position of the lifting tube 31 inside the table leg 3. This prevents the lifting tube 31 from sliding downward inside the table leg 3 when the desk is in use, i.e., when the student applies pressure to the tabletop 32, thus ensuring the stability of the tabletop 32 during use.

[0058] It should be noted that the above operation is only performed after the chair leg 1 and table leg 3 are assembled by tenon 42 and mortise 44. The hooking relationship between hook block 1 55 and hook block 2 519 is that when tenon 42 and mortise 44 are tenoned, during the tenoning process of tenon 42, hook block 1 55 located inside it hooks hook block 2 519 from top to bottom.

[0059] like Figure 1 , Figure 2 and Figures 12 to 14As shown, each of the two lifting tubes 31 is equipped with a translation component for moving the tabletop 32. The translation component includes two guide rails 61 fixedly connected to the top of the two lifting tubes 31. Each guide rail 61 is slidably connected to a sliding frame 62. The two sliding frames 62 are respectively fixedly connected to the two guide rails 61 with springs 63. The lower surface of the sliding frame 62 located outside the guide rail 61 is fixedly connected to two vertical plates. The surface of one vertical plate of the sliding frame 62 near the guide rail 61 has multiple threaded holes 64 arranged in a linear array. The surface of the vertical plate of the sliding frame 62 away from the guide rail 61 has an adjustment groove 65. The screw 67 is slidably fitted inside the adjustment groove 65. The bottom outer surface of the lifting tube 31 is fixedly connected to a shaft 68. The outer surface of the shaft 68 is rotatably connected to a telescopic rod 66. The outer surface of the table leg 3 has a strip groove 69. The outer surface of the table leg 3 is rotatably connected to a limit wheel 610.

[0060] It should be noted that the bottom of the tabletop 32 is fixedly connected to the two sliding brackets 62 by bolts. The shaft 68 extends through the strip groove 69 to the outside of the table leg 3. The top of the telescopic shaft of the telescopic rod 66 is located between the two vertical plates of the sliding bracket 62. A hole is opened at the top of the telescopic shaft of the telescopic rod 66. The screw 67 passes through the hole of the telescopic rod 66 and is threaded to the threaded hole 64.

[0061] Specifically, for students of different body types, i.e., those who are fat, thin, tall, and short, when shorter and taller students use the desktop 32 as a leg rest, the position between the chair seat 22 and the desktop 32 remains constant after the chair legs 1 and the desktop legs 3 are assembled using the assembly components. This results in the desktop 32 not providing effective support for the legs of taller and shorter students when used as a leg rest. To address this, the desktop 32 can be adjusted to move in tandem when moving upwards. For shorter students, the original position of the desktop 32 is sufficient. However, for taller students, the teacher can adjust the position of the top of the telescopic rod 66's telescopic shaft between the two vertical plates of the sliding frame 62 according to the student's height. The teacher then unscrews the screw 67 from the threaded hole 64, disengaging the screw 67 from the threaded connection. At this point, the screw 67 does not need to be pulled out from the top of the telescopic rod 66's telescopic shaft or from the adjustment groove 65. The teacher can hold the screw 67 and pull it horizontally, causing the screw 67 to move to the left inside the adjustment groove 65. Figure 12On the left side, adjusting screw 67 extends the telescopic shaft of telescopic rod 66, making it more tilted. Then, align screw 67 with a nearby threaded hole 64 to thread the screw 67 into the hole. Screw 67 is then fixed between the two vertical plates of sliding frame 62, thus positioning the top of the telescopic shaft of telescopic rod 66 between the two vertical plates. After adjustment, when lifting tube 31 moves downwards inside table leg 3 under the pulling action of the linkage component, lifting tube 3... 1. The guide rail 61 drives the sliding frame 62, which is slidably connected to it, to move downwards synchronously. Simultaneously, the lifting tube 31 drives the shaft 68 to slide downwards inside the strip groove 69. The shaft 68 drives the telescopic rod 66 to move downwards synchronously. During the downward movement of the telescopic rod 66, it will abut against the limiting wheel 610. Under the restriction of the limiting wheel 610, the telescopic rod 66 will rotate around the shaft 68 as its axis of rotation. When the telescopic rod 66 rotates, it will drive the sliding frame 62 to slide horizontally to the right within the guide rail 61 via the screw 67. (Refer to...) Figure 12 On the right side, as the sliding bracket 62 slides, it compresses the spring 63. The moving sliding bracket 62 will cause the tabletop 32 to move horizontally to the right in sync. (Refer to...) Figure 1 When the chair back 14 is tilted, the desktop 32 moves away from the backrest 14, thus moving away from the seat 22. The moved desktop 32 can effectively support the legs of taller students. As the desktop 32 moves downward, it can also move in conjunction with the backrest 14. When the backrest 14 is tilted, the desktop 32 is driven to move downward and move away from the seat 22. The distance of the movement can be adjusted according to the student's height, effectively expanding the range of support for the legs provided by the desktop 32. This adapts to the differences in leg length among students of different heights, ensuring that the desktop 32 can support the student's lower limbs and keep the spine straight, thus improving the product's adaptability to students' heights and the comfort of lunch break.

[0062] It should be noted that after the lunch break, under the elastic reset action of spring 58, the lifting tube 31 moves upward inside the table leg 3. The lifting tube 31, through the guide rail 61, drives the sliding frame 62, which is slidably connected to it, to move upward synchronously. Simultaneously, the lifting tube 31, through the shaft 68, drives the telescopic rod 66 to move upward synchronously. The telescopic rod 66 is no longer restricted by the limit wheel 610. At this time, under the elastic reset action of spring 63, the sliding frame 62 moves to the left on the guide rail 61. (Refer to...) Figure 12 On the left side, desktop 32 can be restored to its original position before being moved, so that students can use desktop 32 normally.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular lunch break desk and chair, comprising two chair legs (1) and two table legs (3), wherein the top of each of the two chair legs (1) is fixedly connected to a fixing rod (11) by bolts, the top of the two fixing rods (11) is fixedly connected to a fixing platform (12), a rotating frame (13) is rotatably connected between the tops of the two fixing rods (11), a chair back (14) is fixedly connected to the side of the rotating frame (13) near the fixing platform (12), both ends of the rotating frame (13) pass through the opposite sides of the two fixing rods (11), and locking modules (15) are provided at both ends of the rotating frame (13) passing through the two fixing rods (11), and lifting tubes (31) are slidably connected to each of the two table legs (3), the top of the two lifting tubes (31) is provided with a tabletop (32), and a table drawer (33) is fixedly connected to the lower surface of the tabletop (32), characterized in that, The fixed platform (12) is equipped with an adjustment component for adjusting the student's sitting posture; The adjustment assembly includes T-shaped bars (21) that are fixedly connected to the fixed platform (12) and arranged in a linear array. The fixed platform (12) is provided with a seat (22). The lower surface of the seat (22) is provided with multiple T-shaped grooves (23) arranged in a linear array. An assembly assembly for connecting the chair legs (1) and the table legs (3) is provided between the two chair legs (1) and the two table legs (3). The assembly includes two foot pads (41) fixedly connected to the two chair legs (1) near the end of the table leg (3). The two foot pads (41) are fixedly connected to tenons (42) on the side away from the chair leg (1). The two table legs (3) are fixedly connected to foot pads (43) near the end of the chair leg (1). The two foot pads (43) are provided with mortises (44) on the side away from the table leg (3). The chair leg (1) and table leg (3) on the same side are provided with a linkage component for lowering the tabletop (32). The two lifting tubes (31) are provided with translation components for moving the tabletop (32). The translation component includes two guide rails (61) fixedly connected to the top of two lifting tubes (31), and sliding frames (62) are slidably connected to each of the two guide rails (61). Springs (63) are fixedly connected between the two sliding frames (62) and the two guide rails (61) respectively. The bottom of the tabletop (32) is fixedly connected to the two sliding frames (62) by bolts.

2. The modular lunch break desk and chair according to claim 1, characterized in that, Both chair legs (1) and both table legs (3) are set in an L-shape, and the interior of both chair legs (1) and both table legs (3) is hollow.

3. The modular lunch break desk and chair according to claim 1, characterized in that, The seat (22) consists of a base plate and a panel, wherein the panel of the seat (22) is set to be raised to the side away from the backrest (14).

4. The modular lunch break desk and chair according to claim 1, characterized in that, The tenon (42) is trapezoidal in shape, and the mortise (44) is shaped to match the tenon (42).

5. The modular lunch break desk and chair according to claim 1, characterized in that, The linkage assembly includes two cross linkage groups (51) located on a section of the inner surface of the rotating frame (13) of the chair leg (1). The bottom of the two cross linkage groups (51) is rotatably connected to a movable plate (52). A winding wheel (53) is rotatably connected to the top of the inner cavity of the chair leg (1). A pull rope (54) is fixedly connected to the upper surface of the movable plate (52). A hook block (55) is fixedly connected to one end of the pull rope (54) near the foot pad cover (41). A sliding groove strip (56) is fixedly connected to the side wall of the chair leg (1). A winding wheel (57) is rotatably connected to the inside of the chair leg (1). A spring (58) is fixedly connected to the bottom of the lifting tube (31). The bottom of the spring (58) is fixedly connected to the inner wall of the table leg (3). A movable groove (59) is opened at the bottom of the lifting tube (31). A spring (510) is fixedly connected to the top of the inner side of the movable groove (59). The bottom of the spring (510) is fixedly connected to the bottom of the spring. A movable tube (511) is fixedly connected. A movable frame (512) is fixedly connected to the bottom of the movable tube (511). Inclined grooves (513) are provided on both sides of the movable frame (512). Slots (514) are provided on both sides of the bottom of the lifting tube (31). A locking block (515) is slidably connected inside the two slots (514). A sliding rod (516) is fixedly connected to the end of the locking block (515) that is close to each other. The two sliding rods (516) slide in the inside of the inclined groove (513). A slot (517) is provided on both sides of the top of the table leg (3). The ends of the two locking blocks (515) that are far apart from each other are inserted into the inside of the two slots (517). A pull rope (518) is fixedly connected to the bottom of the movable frame (512). A hook block (519) is fixedly connected to the end of the pull rope (518) that is close to the foot pad sleeve (43). A winding wheel (520) is rotatably connected inside the table leg (3).

6. The modular lunch break desk and chair according to claim 5, characterized in that, The movable plate (52) slides inside the chair leg (1). A hole is provided in the middle of the movable plate (52). The first pull rope (54) goes up and around the first winding wheel (53). Then the first pull rope (54) passes diagonally downward from the surface of the first winding wheel (53) through the hole in the movable plate (52). After passing around the second winding wheel (57), the first pull rope (54) extends horizontally towards the side near the first foot pad cover (41). The movable groove (59) is composed of a cylindrical groove and a square groove. The movable tube (511) slides in the cylindrical groove of the movable groove (59). The movable frame (512) slides inside the square groove of the movable slot (59). The two slots (514) are connected to the square groove of the movable slot (59). The two slots (514) correspond to the positions of the slot (517). The slot (517) and the shape of the block (515) are compatible. The second pull rope (518) extends horizontally towards the side close to the second foot pad (43) after passing down the winding wheel (520). The second hook block (519) and the first hook block (55) fit together. The bottom of the tenon (42) has a groove.

7. The modular lunch break desk and chair according to claim 1, characterized in that, The translation assembly also includes two vertical plates fixedly connected to the lower surface of the sliding frame (62) located outside the guide slot frame (61). The surface of one vertical plate of the sliding frame (62) near the guide slot frame (61) has multiple threaded holes (64) arranged in a linear array. The surface of one vertical plate of the sliding frame (62) away from the guide slot frame (61) has an adjustment groove (65). The inside of the adjustment groove (65) is fitted with a screw (67). The bottom outer surface of the lifting tube (31) is fixedly connected to a shaft (68). The outer surface of the shaft (68) is rotatably connected to a telescopic rod (66). The outer surface of the table leg (3) has a strip groove (69). The outer surface of the table leg (3) is rotatably connected to a limit wheel (610).

8. The modular lunch break desk and chair according to claim 7, characterized in that, The shaft (68) extends through the strip groove (69) to the outside of the table leg (3). The top of the telescopic shaft of the telescopic rod (66) is located between the two vertical plates of the sliding frame (62). A hole is opened at the top of the telescopic shaft of the telescopic rod (66). The screw (67) passes through the hole of the telescopic rod (66) and is threaded to the threaded hole (64).

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