Desk and chair capable of ascending and descending cooperatively

Abstract

The invention relates to a desk and chair capable of lifting cooperatively, and belongs to the desk and chair technology, the desk and chair comprises a fixed base, a positioning support leg and a vertical mounting frame are fixedly mounted at one end of the top of the fixed base, a lifting driving assembly is mounted on the inner wall of the vertical mounting frame, and a desk plate is mounted on the lifting driving assembly; the table plate is slidably connected with the positioning supporting legs through the first lifting supporting legs, the chair supporting legs and the driven lifting assembly are installed at the other end of the top of the fixed base, the chair supporting legs are connected with the fixed base through the self-positioning type sliding connection assembly, and the chair cushion is installed on the driven lifting assembly. The position of the chair can be flexibly adjusted, it can be guaranteed that the chair and the base are fixed when a user sits on the chair, stability is improved, meanwhile, the table plate and the chair cushion can synchronously ascend and descend, convenience and rapidness are achieved, and practicability is high. And the synchronous lifting of the table plate and the chair cushion is not influenced by the movement of the chair cushion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of desk and chair, in particular to a desk and chair capable of being lifted synchronously. BACKGROUND

[0002] Desk and chair is a basic teaching facility used by students in educational institutions such as schools and training institutions. It consists of a desk and a chair. The desk usually has a flat surface for placing books, stationery and other learning supplies. Some desks also have drawers or storage spaces to facilitate the storage of personal items. The chair provides support for the student's sitting position, ensuring their comfort during learning. The height and angle of the desk and chair should be adapted to the physical characteristics of students of different ages to reduce fatigue caused by long hours of learning and protect the health of the students' spine and eyesight. At the same time, the material should be strong and durable to withstand daily wear and tear and create a good learning environment for students. For example, the lifting desk and chair disclosed in the publication number (CN103519572A) relates to the field of learning supplies. The underside of the desk is provided with a storage drawer, and the two sides of the bottom of the desk are symmetrically provided with desk movable sleeves. One of the desk movable sleeves is provided with a self-locking device, and a handle is provided on the self-locking device. The two desk movable sleeves are both provided on the desk support frame. The chair back is connected to the chair surface through a connecting piece. The two sides of the bottom of the chair surface are symmetrically provided with seat movable sleeves. One of the seat movable sleeves is provided with a self-locking device. The seat movable sleeves are connected to the seat support frame. The middle of the seat support frame is provided with a seat reinforcing weld. It has a simple structure, is easy to operate, can be freely adjusted, and has a self-locking device, so it does not need to be disassembled by screws to complete the adjustment. It can meet the needs of students of different heights.

[0003] For example, the desk and chair disclosed in the publication number (CN118576051A) includes a support structure, a backrest, an enclosure plate, a table plate, and two support arms. The backrest is located in front of the table plate. A gap is formed between the backrest and the table plate. The enclosure plate is provided between the backrest and the table plate and is used to cover the gap. A storage groove is formed in the enclosure plate. Two support arms are parallelly arranged and located below the backrest. Two flip reset mechanisms are provided on the two support arms. A seat bag is provided between the two flip reset mechanisms. The two flip reset mechanisms are used to synchronously drive the seat bag to flip or reset. Through the above arrangement, the enclosure plate can cover the gap, and small objects cannot fall from the gap. In addition, the storage groove is provided on the enclosure plate to facilitate students to place learning supplies or other passengers to place personal items in the storage groove.

[0004] However, the existing desk and chair have many inconvenient problems in use. On the one hand, the desks and chairs of many desks and chairs cannot realize synchronous lifting, when the user needs to adjust the height of the desk and chair to adapt to different learning or working needs, only the desk and chair can be operated respectively, the process is cumbersome and difficult to accurately match to the suitable height combination, which reduces the use efficiency and comfort. On the other hand, even if part of the desks and chairs can realize synchronous lifting, the position between the desk and the chair cannot be adjusted, lacking flexible adjustment mechanism. It is difficult to adjust the linkage distance of the desk and chair according to different use scenes and habits, and it is difficult to adapt to diversified needs. Moreover, when adjusting the position of the chair, it is difficult to balance flexibility and stability, either inconvenient to move or difficult to adjust again after fixing, which brings many troubles to the user and affects the overall use experience. SUMMARY

[0005] In order to overcome the technical defects existing in the prior art, the present application provides a desk and chair capable of synchronous lifting, which has the effect that the desk board and the chair cushion can be lifted synchronously, conveniently and quickly, and the synchronous lifting of the desk board and the chair cushion is not affected by the movement of the chair cushion under the action of the distance-adjustable linkage assembly. At the same time, the chair can be flexibly adjusted in position, and the stability can be ensured when the user is sitting, which can adapt to different scenes and habits.

[0006] The technical solution adopted by the present application is: including a fixed base, the fixed base top one end is fixedly installed with the positioning leg and the vertical installation frame, the vertical installation frame inner wall is installed with the lifting drive assembly, the lifting drive assembly is installed with the desk board, the desk board is slidably connected with the positioning leg through the first lifting leg, the fixed base top other end is installed with the chair leg and the driven lifting assembly, the chair leg is connected with the fixed base through the self-positioning sliding connection assembly, the driven lifting assembly is installed with the chair cushion, the chair cushion is slidably connected with the chair leg through the second lifting leg, and the driven lifting assembly is connected with the lifting drive assembly through the distance-adjustable linkage assembly, and the distance-adjustable linkage assembly is located in the installation through hole slot opened in the fixed base.

[0007] Preferably, in order to drive the threaded rod to rotate in the vertical mounting frame, the threaded rod drives the threaded block to slide up and down in the vertical mounting frame, and under the action of the L-shaped drive frame, the table top moves up and down, the lifting drive assembly comprises the threaded rod and the drive motor, the drive motor is fixed on the inner wall of one end of the vertical mounting frame, one end of the threaded rod is fixedly connected with the output shaft of the drive motor, the other end of the threaded rod is rotatably inserted into the vertical mounting frame, the threaded rod is provided with the threaded block, the threaded block is slidably connected in the vertical mounting frame, and the table top is connected with the threaded block through the L-shaped drive frame.

[0008] Preferably, in order to drive the threaded rod to rotate in the vertical mounting frame, the threaded rod drives the threaded block to slide up and down in the vertical mounting frame, and under the action of the L-shaped drive frame, the table top moves up and down, the lifting drive assembly comprises the threaded rod and the drive motor, the drive motor is fixed on the inner wall of one end of the vertical mounting frame, one end of the threaded rod is fixedly connected with the output shaft of the drive motor, the other end of the threaded rod is rotatably inserted into the vertical mounting frame, the threaded rod is provided with the threaded block, the threaded block is slidably connected in the vertical mounting frame, and the table top is connected with the threaded block through the L-shaped drive frame.

[0009] Preferably, in order to drive the threaded rod to rotate in the vertical mounting frame, the threaded rod drives the threaded block to slide up and down in the vertical mounting frame, and under the action of the L-shaped drive frame, the table top moves up and down, the lifting drive assembly comprises the threaded rod and the drive motor, the drive motor is fixed on the inner wall of one end of the vertical mounting frame, one end of the threaded rod is fixedly connected with the output shaft of the drive motor, the other end of the threaded rod is rotatably inserted into the vertical mounting frame, the threaded rod is provided with the threaded block, the threaded block is slidably connected in the vertical mounting frame, and the table top is connected with the threaded block through the L-shaped drive frame.

[0010] Preferably, in order to drive the threaded rod to rotate in the vertical mounting frame, the threaded rod drives the threaded block to slide up and down in the vertical mounting frame, and under the action of the L-shaped drive frame, the table top moves up and down, the lifting drive assembly comprises the threaded rod and the drive motor, the drive motor is fixed on the inner wall of one end of the vertical mounting frame, one end of the threaded rod is fixedly connected with the output shaft of the drive motor, the other end of the threaded rod is rotatably inserted into the vertical mounting frame, the threaded rod is provided with the threaded block, the threaded block is slidably connected in the vertical mounting frame, and the table top is connected with the threaded block through the L-shaped drive frame.

[0011] Preferably, in order to rotate the driven threaded rod by the driven sprocket, the driven lifting assembly comprises the positioning connecting plate, the positioning connecting plate is fixed on the inner wall of the chair leg, the driven threaded rod is rotatably inserted into the positioning connecting plate, the driven sprocket is fixedly sleeved on one end of the driven threaded rod, and the other end of the driven threaded rod is located below the chair cushion.

[0012] Preferably, in order to lift the driven strip plate along the driven threaded rod by controlling the rotation of the driven threaded rod, so that the chair cushion moves up and down under the action of the lifting column, the driven threaded rod is threadedly sleeved with the driven strip plate, the chair cushion is fixedly connected with the driven strip plate through the lifting column, and the lifting column is located on both sides of the driven strip plate.

[0013] Preferably, in order to position the chair leg by the positioning pin head, the self-positioning sliding connection assembly comprises the positioning pin head and the L-shaped mounting frame, the positioning pin head is fixed at the bottom of the chair leg, and the positioning pin head is vertically corresponding to the positioning pin hole which is linearly and uniformly arranged on the fixed base.

[0014] Preferably, in order to limit the position of the limiting strip block through the L-shaped mounting frame and the lifting support plate, and facilitate the chair leg to be pressed down and automatically lifted through the return spring, the lifting support plate is slidably installed on the inner wall of the L-shaped mounting frame, the lifting support plate is elastically connected with the top of the fixed base through the return spring, the limiting strip block is fixedly installed on the side wall of the chair leg, and the limiting strip block is slidably inserted between the L-shaped mounting frame and the lifting support plate.

[0015] The beneficial effects of the present application are: through the lifting driving assembly, the distance-adjustable linkage assembly and the driven lifting assembly, the table plate and the chair cushion can be lifted synchronously, conveniently and quickly, and the synchronous lifting of the table plate and the chair cushion is not affected by the movement of the chair cushion under the action of the distance-adjustable linkage assembly; at the same time, under the action of the self-positioning sliding connection assembly, the chair can be flexibly adjusted in position, and the chair and the base can be fixed when the user is sitting, so as to improve the stability, adapt to different scenes and habits, help the user to easily obtain a comfortable table and chair height combination, and meet diversified needs. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the overall structure of the present application;

[0017] Figure 2 It is a schematic view of the mounting structure of the chair cushion of the present application;

[0018] Figure 3 Figure 1 is a schematic diagram of the connection structure of the lifting driving assembly and the driven lifting assembly of the present application;

[0019] Figure 4 Figure 2 is a schematic diagram of the structure of the lifting driving assembly of the present application;

[0020] Figure 5 Figure 3 is a schematic diagram of the connection structure of the driving sprocket and the driven sprocket of the present application;

[0021] Figure 6 Figure 4 is a schematic diagram of the mounting structure of the first following sprocket and the second following sprocket of the present application;

[0022] Figure 7 Figure 5 is a schematic diagram of the mounting structure of the driven lifting assembly on the chair leg of the present application;

[0023] Figure 8 Figure 6 is a schematic diagram of the structure of the driven lifting assembly of the present application;

[0024] Figure 9 Figure 7 is a schematic diagram of the mounting structure of the lifting support plate of the present application;

[0025] Figure 10 Figure 8 is a schematic diagram of the structure of the fixed base of the present application.

[0026] Legend: In the figure: 1, fixed base; 2, positioning leg; 3, vertical mounting frame; 4, lifting driving assembly; 401, driving threaded rod; 402, driving motor; 403, driving threaded slider; 404, L-shaped driving bracket; 5, table plate; 6, first lifting leg; 7, chair leg; 8, driven lifting assembly; 801, positioning connecting plate; 802, driven threaded rod; 803, driven strip plate; 804, lifting column; 9, self-positioning sliding connecting assembly; 901, positioning pin head; 902, L-shaped mounting bracket; 903, lifting support plate; 904, return spring; 905, limiting strip block; 10, chair cushion; 11, second lifting leg; 12, distance-adjustable linkage assembly; 1201, limiting mounting bracket; 1202, driving sprocket; 1203, driven sprocket; 1204, servo motor; 1205, bidirectional adjusting lead screw; 1206, rotating joint; 1207, adjusting threaded slider; 1208, rotating connecting shaft; 1209, first following sprocket; 1210, second following sprocket; 1211, synchronous chain. DETAILED DESCRIPTION

[0027] The present application will be further described below in conjunction with the accompanying drawings:

[0028] As Figures 1-10As shown, the embodiment provides a desk and chair that can be lifted together, comprising a fixed base 1, a fixed base 1 top end fixedly installed with a positioning leg 2 and a vertical installation frame 3, a vertical installation frame 3 inner wall installed with a lifting drive assembly 4, a lifting drive assembly 4 installed with a table plate 5, a table plate 5 slidably connected with the positioning leg 2 through a first lifting leg 6, a fixed base 1 top end installed with a chair leg 7 and a driven lifting assembly 8, a chair leg 7 connected with the fixed base 1 through a self-positioning sliding connection assembly 9, a driven lifting assembly 8 installed with a chair cushion 10, a chair cushion 10 slidably connected with the chair leg 7 through a second lifting leg 11, and the driven lifting assembly 8 connected with the lifting drive assembly 4 through a distance-adjustable linkage assembly 12, and the distance-adjustable linkage assembly 12 located in the installation through-hole slot opened on the fixed base 1, first adjust the initial position of the desk and chair according to the requirements. Start the lifting drive assembly 4, which will drive the table plate 5 to slide along the first lifting leg 6 on the positioning leg 2, realizing the lifting of the table plate 5. At the same time, since the driven lifting assembly 8 is connected with the lifting drive assembly 4 through the distance-adjustable linkage assembly 12, when the lifting drive assembly 4 operates, the driven lifting assembly 8 will also act, thereby driving the chair cushion 10 to slide along the second lifting leg 11 on the chair leg 7, making the chair cushion 10 and the table plate 5 lift synchronously, and through the self-positioning sliding connection assembly 9, the chair leg 7 and the chair cushion 10 can slide on the fixed base 1, realizing flexible adjustment, and when the user maintains a sitting posture, the chair leg 7 can be fixedly connected with the fixed base 1, ensuring the stability of use, and when the chair leg 7 is moved, the distance-adjustable linkage assembly 12 can be adjusted in the installation through-hole slot, which can adapt to different use scenarios and habits, allowing users to easily obtain a comfortable desk and chair height combination.

[0029] As a technical optimization scheme of the present application, specifically as Figure 4As shown, the lifting driving assembly 4 comprises a driving threaded rod 401 and a driving motor 402, the driving motor 402 is fixed on the inner wall of one end of the vertical mounting frame 3, one end of the driving threaded rod 401 is fixedly connected with the output shaft of the driving motor 402, the other end of the driving threaded rod 401 is rotatably inserted in the vertical mounting frame 3, the driving threaded rod 401 is provided with a driving threaded sliding block 403, the driving threaded sliding block 403 is slidably connected in the vertical mounting frame 3, the table plate 5 is connected with the driving threaded sliding block 403 through an L-shaped driving frame 404, when the lifting driving assembly 4 is used, the driving motor 402 fixed on the inner wall of one end of the vertical mounting frame 3 is started first, the output shaft of the driving motor 402 drives the driving threaded rod 401 to rotate. Since the other end of the driving threaded rod 401 is rotatably inserted in the vertical mounting frame 3 and the driving threaded sliding block 403 is slidably connected in the vertical mounting frame 3, the rotation of the threaded rod will drive the driving threaded sliding block 403 to move along the rod. The driving threaded sliding block 403 is connected with the table plate 5 through the L-shaped driving frame 404, thereby driving the table plate 5 to move, the lifting of the table plate 5 along the first lifting leg 6 on the positioning leg 2 is realized, and the different height requirements are met.

[0030] As a technical optimization scheme of the present application, specifically as Figure 5 and Figure 6As shown, the distance-adjustable linkage assembly 12 comprises a limiting mounting frame 1201, a driving sprocket 1202 and a driven sprocket 1203. The driving sprocket 1202 is fixedly sleeved on the driving threaded rod 401, the driven sprocket 1203 is connected with the driven lifting assembly 8, the limiting mounting frame 1201 is fixed on the inner wall of the mounting through hole slot, a servo motor 1204 is fixedly installed on one end of the inner wall of the limiting mounting frame 1201, a bidirectional adjusting lead screw 1205 is fixedly connected on the output shaft of the servo motor 1204, one end of the bidirectional adjusting lead screw 1205 is rotatably connected to the other end of the inner wall of the limiting mounting frame 1201 through a rotating joint 1206, an adjusting threaded block 1207 is installed on the bidirectional adjusting lead screw 1205, the adjusting threaded block 1207 is slidably clamped on the inner wall of the limiting mounting frame 1201, the number of the adjusting threaded block 1207 is two, the two adjusting threaded blocks 1207 are respectively located at the reverse thread ends of the bidirectional adjusting lead screw 1205, a rotating connecting shaft 1208 is rotatably installed on each of the two adjusting threaded blocks 1207, a first following sprocket 1209 and a second following sprocket 1210 are fixedly sleeved on the upper middle of the two rotating connecting shafts 1208 respectively, the driving sprocket 1202, the driven sprocket 1203, the first following sprocket 1209 and the second following sprocket 1210 are connected through a synchronous chain 1211. When the linkage distance of the table and chair needs to be adjusted, the servo motor 1204 on the inner wall of the limiting mounting frame 1201 is started, and the output shaft drives the bidirectional adjusting lead screw 1205 to rotate. Because the bidirectional adjusting lead screw 1205 has reverse threads at both ends, the two adjusting threaded blocks 1207 will move towards or away from each other, thereby changing the positions of the first following sprocket 1209 and the second following sprocket 1210. The driving sprocket 1202 is fixed on the driving threaded rod 401, the driven sprocket 1203 is connected with the driven lifting assembly 8, and the four sprockets are connected through the synchronous chain 1211. After adjusting the positions of the sprockets, the driving threaded rod 401 is rotated to drive the driving sprocket 1202, which is transmitted to the driven sprocket 1203 through the synchronous chain 1211, so that the driven lifting assembly 8 moves, the chair cushion 10 is driven to synchronously ascend and descend with the table board 5, the table board 5 and the chair cushion 10 are accurately and synchronously ascended and descended, different use scenarios are adapted, the operation is convenient, and the effect is remarkable.

[0031] As a technical optimization scheme of the present application, specifically as Figure 8As shown, the driven lifting assembly 8 comprises a positioning connecting plate 801 fixed on the inner wall of the chair leg 7, a driven threaded rod 802 rotatably inserted on the positioning connecting plate 801, a driven sprocket 1203 fixedly sleeved on one end of the driven threaded rod 802, the other end of the driven threaded rod 802 being located below the chair cushion 10, a driven strip plate 803 threadedly sleeved on the driven threaded rod 802, and the chair cushion 10 being fixedly connected with the driven strip plate 803 through lifting columns 804 located on both sides of the driven strip plate 803. In use, the driven sprocket 1203 in the distance-adjustable linkage assembly 12 is rotated under the driving of the synchronous chain 1211. Since the driven sprocket 1203 is fixedly sleeved on one end of the driven threaded rod 802, the driven threaded rod 802 is rotated on the positioning connecting plate 801. The positioning connecting plate 801 is fixed on the inner wall of the chair leg 7, and the driven strip plate 803 threadedly sleeved on the driven threaded rod 802 moves up and down along the driven threaded rod 802 when the driven threaded rod 802 rotates. The chair cushion 10 is fixedly connected with the driven strip plate 803 through the lifting columns 804 located on both sides of the driven strip plate 803, thereby driving the chair cushion 10 to slide along the second lifting leg 11 on the chair leg 7, achieving synchronous lifting with the table board 5.

[0032] As a technical optimization scheme of the present application, as shown in Figure 8 and Figure 9 As shown, the self-positioning sliding connection assembly 9 comprises a positioning pin head 901 fixed on the bottom of the chair leg 7 and vertically corresponding to the positioning pin holes linearly and uniformly arranged on the fixed base 1, and an L-shaped mounting bracket 902, an lifting supporting plate 903 being slidingly installed on the inner wall of the L-shaped mounting bracket 902, the lifting supporting plate 903 being elastically connected with the top of the fixed base 1 through a return spring 904, a limiting strip block 905 being fixedly installed on the side wall of the chair leg 7 and slidingly inserted between the L-shaped mounting bracket 902 and the lifting supporting plate 903. If it is necessary to adjust the position of the chair, the user stands up, the lifting supporting plate 903 drives the chair cushion 10 to rise under the action of the return spring 904, so that the positioning pin head 901 is separated from the positioning pin hole, and the chair leg 7 is pulled to slide between the L-shaped mounting bracket 902 and the lifting supporting plate 903, achieving flexible position adjustment. When the user sits down, the positioning pin head 901 is inserted into the corresponding positioning pin hole by overcoming the elastic force of the return spring 904, so as to position the chair leg 7 and ensure stability during use.

[0033] The above shows and describes the basic principles and main features and advantages of the present application, and those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application, and the scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A height-adjustable desk and chair, comprising a fixed base (1), characterized in that: The fixed base (1) has a positioning leg (2) and a vertical mounting frame (3) fixedly installed at one end of its top. A lifting drive assembly (4) is installed on the inner wall of the vertical mounting frame (3). A table (5) is installed on the lifting drive assembly (4). The table (5) is slidably connected to the positioning leg (2) through the first lifting leg (6). The other end of the fixed base (1) has a chair leg (7) and a driven lifting assembly (8). The chair leg (7) is connected to the fixed base (1) through a self-positioning sliding connection assembly (9). A chair cushion (10) is installed on the driven lifting assembly (8). The chair cushion (10) is slidably connected to the chair leg (7) through the second lifting leg (11). The driven lifting assembly (8) is connected to the lifting drive assembly (4) through a distance adjustable linkage assembly (12). The distance adjustable linkage assembly (12) is located in the mounting through-hole groove opened on the fixed base (1).

2. The height-adjustable desk and chair according to claim 1, characterized in that: The lifting drive assembly (4) includes a drive threaded rod (401) and a drive motor (402). The drive motor (402) is fixed on the inner wall of one end of the vertical mounting frame (3). One end of the drive threaded rod (401) is fixedly connected to the output shaft of the drive motor (402). The other end of the drive threaded rod (401) is rotatably inserted into the vertical mounting frame (3). A drive threaded slider (403) is installed on the drive threaded rod (401). The drive threaded slider (403) is slidably engaged in the vertical mounting frame (3). The table (5) is connected to the drive threaded slider (403) through an L-shaped drive frame (404).

3. The height-adjustable desk and chair according to claim 2, characterized in that: The adjustable linkage assembly (12) includes a limiting mounting bracket (1201), a drive sprocket (1202), and a driven sprocket (1203). The drive sprocket (1202) is fixedly sleeved on the drive threaded rod (401). The driven sprocket (1203) is connected to the driven lifting assembly (8). The limiting mounting bracket (1201) is fixed on the inner wall of the mounting through hole groove. A servo motor (1204) is fixedly mounted on the inner wall of one end of the limiting mounting bracket (1201). A bidirectional adjusting screw (1205) is fixedly connected to the output shaft of the servo motor (1204). One end of the bidirectional adjusting screw (1205) is rotatably connected to the inner wall of the other end of the limiting mounting bracket (1201) through a rotating joint (1206).

4. The height-adjustable desk and chair according to claim 3, characterized in that: An adjusting threaded slider (1207) is installed on the bidirectional adjusting screw (1205). The adjusting threaded slider (1207) is slidably engaged on the inner wall of the limiting mounting bracket (1201). There are two adjusting threaded sliders (1207), and the two adjusting threaded sliders (1207) are respectively located at the reverse thread ends of the bidirectional adjusting screw (1205).

5. The height-adjustable desk and chair according to claim 4, characterized in that: A rotating connecting shaft (1208) is rotatably mounted on each of the two adjusting threaded sliders (1207). A first following sprocket (1209) and a second following sprocket (1210) are respectively fixedly sleeved on the upper part of the rotating connecting shafts (1208) on both sides. The driving sprocket (1202), the driven sprocket (1203), the first following sprocket (1209) and the second following sprocket (1210) are connected by a synchronous chain (1211).

6. The height-adjustable desk and chair according to claim 3, characterized in that: The driven lifting assembly (8) includes a positioning connecting plate (801), which is fixed on the inner wall of the chair leg (7). A driven threaded rod (802) is rotatably inserted into the positioning connecting plate (801). A driven sprocket (1203) is fixedly sleeved on one end of the driven threaded rod (802), and the other end of the driven threaded rod (802) is located below the chair cushion (10).

7. The height-adjustable desk and chair according to claim 6, characterized in that: The driven threaded rod (802) is threaded with a driven strip plate (803), and the chair cushion (10) is fixedly connected to the driven strip plate (803) through a lifting column (804), and the lifting column (804) is located on both sides of the driven strip plate (803).

8. The height-adjustable desk and chair according to claim 1, characterized in that: The self-positioning sliding connection assembly (9) includes a positioning pin (901) and an L-shaped mounting bracket (902). The positioning pin (901) is fixed to the bottom of the chair leg (7), and the positioning pin (901) is vertically aligned with the positioning pin holes that are linearly and evenly opened on the fixed base (1).

9. The height-adjustable desk and chair according to claim 8, characterized in that: A lifting support plate (903) is slidably installed on the inner wall of the L-shaped mounting bracket (902). The lifting support plate (903) is elastically connected to the top of the fixed base (1) through a return spring (904). A limiting block (905) is fixedly installed on the side wall of the chair leg (7). The limiting block (905) is slidably inserted between the L-shaped mounting bracket (902) and the lifting support plate (903).

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